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Prof. Lasantha Meegahapola
RMIT University, Melbourne Australia

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Research Keywords & Expertise

0 Power System Stability
0 microgrids
0 Phasor Measurement Unit
0 Voltage Control
0 power system dynamics

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microgrids
Power System Stability
Voltage Control
frequency control
power system dynamics

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Short Biography

A/Prof. Lasantha Meegahapola is currently an Associate Professor with the Electrical and Biomedical Engineering, School of Engineering, RMIT University, Australia. He received a BSc. Eng. degree in Electrical Engineering (First Class, Honours) from the University of Moratuwa, Sri Lanka in 2006, and a PhD degree from the Queen's University of Belfast, UK in 2010. A/Prof. Meegahapola was a Visiting Researcher/ Post-Doctoral Researcher at the Electricity Research Centre (ERC), University College Dublin, Ireland (2009-2010). From 2011 to 2014, he was employed as a Lecturer at the University of Wollongong (UOW) and has continued to work as an Honorary Fellow. He has conducted extensive research studies in power system stability with renewable power integration over the last fifteen years and has published more than 120 journal and conference articles. A/Prof. Meegahapola’s research interests are Renewable Power Generation, Power System Dynamics & Stability, and Microgrid Stability & Control. He is a Senior Member of IEEE (SMIEEE) and a Member of the IEEE Power Engineering Society (PES) and the IEEE Industry Applications Society (IAS). He also an active member of the IEEE PES power system dynamic performance (PSDP) committee task force on microgrid stability analysis and modelling and the working group on voltage stability. A/Prof. Meegahapola is also serving as an Associate Editor of the IEEE ACCESS and IET Renewable Power Generation journals.

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Editorial
Published: 21 June 2021 in Energies
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Power network operators are rapidly incorporating wind power generation into their power grids to meet the widely accepted carbon neutrality targets and facilitate the transition from conventional fossil-fuel energy sources to the clean and low-carbon renewable energy sources

ACS Style

Lasantha Meegahapola; Siqi Bu. Special Issue: “Wind Power Integration into Power Systems: Stability and Control Aspects”. Energies 2021, 14, 3680 .

AMA Style

Lasantha Meegahapola, Siqi Bu. Special Issue: “Wind Power Integration into Power Systems: Stability and Control Aspects”. Energies. 2021; 14 (12):3680.

Chicago/Turabian Style

Lasantha Meegahapola; Siqi Bu. 2021. "Special Issue: “Wind Power Integration into Power Systems: Stability and Control Aspects”." Energies 14, no. 12: 3680.

Journal article
Published: 20 April 2021 in Energies
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This paper presents a comparative analysis of six sampling techniques to identify an efficient and accurate sampling technique to be applied to probabilistic voltage stability assessment in large-scale power systems. In this study, six different sampling techniques are investigated and compared to each other in terms of their accuracy and efficiency, including Monte Carlo (MC), three versions of Quasi-Monte Carlo (QMC), i.e., Sobol, Halton, and Latin Hypercube, Markov Chain MC (MCMC), and importance sampling (IS) technique, to evaluate their suitability for application with probabilistic voltage stability analysis in large-scale uncertain power systems. The coefficient of determination (R2) and root mean square error (RMSE) are calculated to measure the accuracy and the efficiency of the sampling techniques compared to each other. All the six sampling techniques provide more than 99% accuracy by producing a large number of wind speed random samples (8760 samples). In terms of efficiency, on the other hand, the three versions of QMC are the most efficient sampling techniques, providing more than 96% accuracy with only a small number of generated samples (150 samples) compared to other techniques.

ACS Style

Mohammed Alzubaidi; Kazi Hasan; Lasantha Meegahapola; Mir Rahman. Identification of Efficient Sampling Techniques for Probabilistic Voltage Stability Analysis of Renewable-Rich Power Systems. Energies 2021, 14, 2328 .

AMA Style

Mohammed Alzubaidi, Kazi Hasan, Lasantha Meegahapola, Mir Rahman. Identification of Efficient Sampling Techniques for Probabilistic Voltage Stability Analysis of Renewable-Rich Power Systems. Energies. 2021; 14 (8):2328.

Chicago/Turabian Style

Mohammed Alzubaidi; Kazi Hasan; Lasantha Meegahapola; Mir Rahman. 2021. "Identification of Efficient Sampling Techniques for Probabilistic Voltage Stability Analysis of Renewable-Rich Power Systems." Energies 14, no. 8: 2328.

Overview
Published: 05 April 2021 in WIREs Energy and Environment
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Increasing power system stability challenges are being witnessed worldwide, while transitioning toward low‐carbon grids with a high‐share of power electronic converter (PEC)‐interfaced renewable energy sources (RESs) and distributed energy resources (DERs). Concurrently, new technologies and operational strategies are being implemented or proposed to tackle these challenges. Since electricity grids are deregulated in many jurisdictions, such technologies need to be integrated within a market framework, which is often a challenge in itself due to inevitable regulatory delays in updating grid codes and market rules. It is also highly desirable to ensure that an economically feasible optimal technology mix is integrated in the power system, without imposing additional burdens on electricity consumers. This article provides a comprehensive overview of emerging power system stability challenges posed by PEC‐interfaced RES and DER, particularly related to low inertia and low system strength conditions, while also introducing new technologies that can help tackle these challenges and discussing the need for suitable techno‐economic considerations to integrate them into system and market operation. As a key point, the importance of recognizing the complexity of system services to guarantee stability in low‐carbon grids is emphasized, along with the need to carefully integrate new grid codes and market mechanisms in order to exploit the full benefits of emerging technologies in the transition toward ultra‐low carbon futures. This article is categorized under: Energy Systems Economics > Economics and Policy Energy Systems Analysis > Systems and Infrastructure Energy and Development > Systems and Infrastructure

ACS Style

Lasantha Meegahapola; Pierluigi Mancarella; Damian Flynn; Rodrigo Moreno. Power system stability in the transition to a low carbon grid: A techno‐economic perspective on challenges and opportunities. WIREs Energy and Environment 2021, 10, e399 .

AMA Style

Lasantha Meegahapola, Pierluigi Mancarella, Damian Flynn, Rodrigo Moreno. Power system stability in the transition to a low carbon grid: A techno‐economic perspective on challenges and opportunities. WIREs Energy and Environment. 2021; 10 (5):e399.

Chicago/Turabian Style

Lasantha Meegahapola; Pierluigi Mancarella; Damian Flynn; Rodrigo Moreno. 2021. "Power system stability in the transition to a low carbon grid: A techno‐economic perspective on challenges and opportunities." WIREs Energy and Environment 10, no. 5: e399.

Journal article
Published: 09 December 2020 in IET Generation, Transmission & Distribution
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The first swing rotor angle stability is still an important stability challenge for modern power systems integrated with a large number of renewable energy-based sources, such as wind farms and solar-photovoltaic farms. Therefore, innovative strategies must be developed to exploit the full potential of doubly fed induction generators (DFIGs) to improve the first swing rotor angle stability in the system. This study presents a new active power logic (APL) controller for DFIGs which can reduce the active power during the fault and slowly recover it after the fault to allow synchronous generators to increase the electrical power during and after the fault; thus, enabling synchronous generators to improve the first swing rotor angle stability. The feasibility of the proposed control scheme is investigated via theoretical analysis and simulation studies. The reliability and voltage stability test system is used to demonstrate the effectiveness of the proposed scheme for local and remote faults and increased DFIG penetration conditions. The comparative results show that the proposed APL controller of the DFIG improves the first swing rotor angle stability, specifically when the DFIGs are located near the synchronous generators.

ACS Style

Enkhtsetseg Munkhchuluun; Lasantha Meegahapola; Arash Vahidnia. Impact of active power recovery rate of DFIG wind farms on first swing rotor angle stability. IET Generation, Transmission & Distribution 2020, 14, 6041 -6048.

AMA Style

Enkhtsetseg Munkhchuluun, Lasantha Meegahapola, Arash Vahidnia. Impact of active power recovery rate of DFIG wind farms on first swing rotor angle stability. IET Generation, Transmission & Distribution. 2020; 14 (25):6041-6048.

Chicago/Turabian Style

Enkhtsetseg Munkhchuluun; Lasantha Meegahapola; Arash Vahidnia. 2020. "Impact of active power recovery rate of DFIG wind farms on first swing rotor angle stability." IET Generation, Transmission & Distribution 14, no. 25: 6041-6048.

Journal article
Published: 07 August 2020 in IEEE Access
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Self-governing small regions of power systems, known as “microgrids”, are enabling the integration of small-scale renewable energy sources (RESs) while improving the reliability and energy efficiency of the electricity network. Microgrids can be primarily classified into three types based on their voltage characteristics and system architecture; 1) AC microgrids, 2) DC microgrids, and 3) Hybrid AC/DC microgrids. This paper presents a comprehensive review of stability, control, power management and fault ride-through (FRT) strategies for the AC, DC, and hybrid AC/DC microgrids. This paper also classifies microgrids in terms of their intended application and summarises the operation requirements stipulated in standards (e.g., IEEE Std. 1547-2018). The control strategies for each microgrid architecture are reviewed in terms of their operating principle and performance. In terms of the hybrid AC/DC microgrids, specific control aspects, such as mode transition and coordinated control between multiple interlinking converters (ILCs) and energy storage system (ESS) are analysed. A case study is also presented on the dynamic performance of a hybrid AC/DC microgrid under different control strategies and dynamic loads. Hybrid AC/DC microgrids shown to have more advantages in terms of economy and efficiency compared with the other microgrid architectures. This review shows that hierarchical control schemes, such as primary, secondary, and tertiary control are very popular among all three microgrid types. It is shown that the hybrid AC/DC microgrids require more complex control strategies for power management and control compared to AC or DC microgrids due to their dependency on the ILC controls and the operation mode of the hybrid AC/DC microgrid. Case study illustrated the significant effects of microgrid feeder characteristics on the dynamic performance of the hybrid AC/DC microgrid. It is also revealed that any transient conditions either in the AC or DC microgrids could propagate through the ILC affecting the entire microgrid dynamic performance. Additionally, the critical control issues and the future research challenges of microgrids are also discussed in this paper.

ACS Style

Moudud Ahmed; Lasantha Meegahapola; Arash Vahidnia; Manoj Datta. Stability and Control Aspects of Microgrid Architectures–A Comprehensive Review. IEEE Access 2020, 8, 144730 -144766.

AMA Style

Moudud Ahmed, Lasantha Meegahapola, Arash Vahidnia, Manoj Datta. Stability and Control Aspects of Microgrid Architectures–A Comprehensive Review. IEEE Access. 2020; 8 (99):144730-144766.

Chicago/Turabian Style

Moudud Ahmed; Lasantha Meegahapola; Arash Vahidnia; Manoj Datta. 2020. "Stability and Control Aspects of Microgrid Architectures–A Comprehensive Review." IEEE Access 8, no. 99: 144730-144766.

Review
Published: 03 July 2020 in Energies
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The energy sector is currently undergoing a rapid transformation with the integration of power electronic converter (PEC)-interfaced renewable energy sources (RES), such as wind and solar photovoltaic (PV) systems, at both the transmission and distribution networks. Power system stability has been significantly influenced by this power grid transformation. This paper comprehensively reviews major power system stability issues affected due to large-scale integration of PEC-interfaced RES in power grids, with some example case studies relevant for each stability category. According to the review, stability issues are mainly originating from reduction in synchronous inertia, reduction in reactive power reserve, low short-circuit strength of the power network, and fault ride-through (FRT) strategy/capability of the PEC-interfaced RES. Decrease in synchronous inertia could affect both the rotor angle stability and the frequency stability, while decrease in short-circuit strength and reactive power reserve could cause voltage stability and rotor angle stability issues in power networks. Sub-synchronous control interactions are also receiving a lot of attention by the power industry due to increasing oscillatory stability incidents reported in power networks with PEC-interfaced RES. FRT capabilities/strategies of PEC-interfaced RES are also playing a pivotal role in power grid stability due to its influence on active and reactive power, hence more emphasis should be placed on FRT schemes of PEC-interfaced RES, since future power grids are expected to operate with 100% PEC-interfaced generation sources. Stability improvement strategies could be implemented to address multiple stability issues in PEC-interfaced power networks; however, rigorous stability studies are required to identify the optimal conditions to implement these improvement strategies. Furthermore, ongoing structural changes in power grids to accommodate remotely sited PEC-interfaced RES are also influencing the stability of power grids. Therefore, all these factors must be carefully considered by system operators when planning and operating power grids in a secure and stable manner with high penetration levels of PEC-interfaced RES.

ACS Style

Lasantha Meegahapola; Alfeu Sguarezi; Jack Stanley Bryant; Mingchen Gu; Eliomar R. Conde D.; Rafael B. A. Cunha. Power System Stability with Power-Electronic Converter Interfaced Renewable Power Generation: Present Issues and Future Trends. Energies 2020, 13, 3441 .

AMA Style

Lasantha Meegahapola, Alfeu Sguarezi, Jack Stanley Bryant, Mingchen Gu, Eliomar R. Conde D., Rafael B. A. Cunha. Power System Stability with Power-Electronic Converter Interfaced Renewable Power Generation: Present Issues and Future Trends. Energies. 2020; 13 (13):3441.

Chicago/Turabian Style

Lasantha Meegahapola; Alfeu Sguarezi; Jack Stanley Bryant; Mingchen Gu; Eliomar R. Conde D.; Rafael B. A. Cunha. 2020. "Power System Stability with Power-Electronic Converter Interfaced Renewable Power Generation: Present Issues and Future Trends." Energies 13, no. 13: 3441.

Journal article
Published: 06 April 2020 in IEEE Access
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High penetration of dynamic loads, such as induction motors (IMs) could give rise to sustained voltage/frequency and power oscillations in hybrid AC/DC microgrids during disturbances. Majority of the published literature has investigated these stability issues with aggregated models of IMs in hybrid AC/DC microgrids, which do not properly reflect the actual dynamics of parallel operating IMs; hence, power oscillation damping (POD) controllers must be designed explicitly considering various oscillations induced by parallel operating IMs. This paper proposes an adaptive neuro-fuzzy inference system (ANFIS) based POD controller to damp low-frequency oscillations (LFOs) induced by IMs in hybrid AC/DC microgrids. The proposed supplementary POD controller was embedded to the energy storage system (ESS) controller, which provides additional damping power proportional to the frequency deviation. The following two features namely: 1) ability to adjust the gain based on the frequency deviation, and 2) ability to handle more non-linearity in the system dynamics, make the proposed adaptive ANFIS based POD controller more unique compared to conventional POD controllers. The effectiveness of the proposed ANFIS-POD controller is verified using non-linear dynamic simulations considering a range of disturbances in a hybrid AC/DC microgrid and different combinations of parallel operating IMs. Results indicate improved oscillatory stability performance in the hybrid AC/DC microgrid with the proposed ANFIS-POD controller.

ACS Style

Moudud Ahmed; Arash Vahidnia; Manoj Datta; Lasantha Meegahapola. An Adaptive Power Oscillation Damping Controller for a Hybrid AC/DC Microgrid. IEEE Access 2020, 8, 69482 -69495.

AMA Style

Moudud Ahmed, Arash Vahidnia, Manoj Datta, Lasantha Meegahapola. An Adaptive Power Oscillation Damping Controller for a Hybrid AC/DC Microgrid. IEEE Access. 2020; 8 (99):69482-69495.

Chicago/Turabian Style

Moudud Ahmed; Arash Vahidnia; Manoj Datta; Lasantha Meegahapola. 2020. "An Adaptive Power Oscillation Damping Controller for a Hybrid AC/DC Microgrid." IEEE Access 8, no. 99: 69482-69495.

Journal article
Published: 01 April 2020 in IEEE Transactions on Power Systems
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In this paper, an adaptive coordinated voltage and frequency control scheme is proposed for hybrid AC/ multi-terminal high voltage direct current (MT-HVDC) power networks for stability improvement. The coordinated control strategy is realised using a multi-dimensional droop approach, which can also be implemented as a distributed control strategy in hybrid AC/MT-HVDC networks without a communication link between voltage source converters (VSCs). Moreover, the controller parameters are adaptive to the fault condition to improve the stability and suppress post-fault oscillations. A state-space model of the VSC is built while explicitly representing the phase-locked loop (PLL) dynamics. An oscillation index is proposed to quantitatively assess the oscillation severity of the AC voltage, frequency and the DC voltage. The proposed strategy is implemented in the CIGRE test system developed in DIgSILENT Power Factory. According to the small-signal stability study, the proposed multi-dimensional control scheme improves the frequency stability and maintains the AC voltage stability of the hybrid AC/MT-HVDC power network. Under severe fault conditions, the adaptive multi-dimensional control scheme improves the system stability while adjusting the controller parameters based on the severity of the fault. Therefore, the proposed scheme can improve and optimise the overall stability of the hybrid AC/DC power grid.

ACS Style

Mingchen Gu; Lasantha Gunaruwan Meegahapola; Alan K. L. Wong. Coordinated Voltage and Frequency Control in Hybrid AC/MT-HVDC Power Grids for Stability Improvement. IEEE Transactions on Power Systems 2020, 36, 635 -647.

AMA Style

Mingchen Gu, Lasantha Gunaruwan Meegahapola, Alan K. L. Wong. Coordinated Voltage and Frequency Control in Hybrid AC/MT-HVDC Power Grids for Stability Improvement. IEEE Transactions on Power Systems. 2020; 36 (1):635-647.

Chicago/Turabian Style

Mingchen Gu; Lasantha Gunaruwan Meegahapola; Alan K. L. Wong. 2020. "Coordinated Voltage and Frequency Control in Hybrid AC/MT-HVDC Power Grids for Stability Improvement." IEEE Transactions on Power Systems 36, no. 1: 635-647.

Review
Published: 17 January 2020 in IEEE Transactions on Industrial Electronics
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Oscillatory stability has received immense attention in recent years due to the significant increase of power-electronic converter (PEC)-interfaced renewable energy sources. Synchrophasor technology offers superior capability to measure and monitor power systems in real time, and power system operators require better understanding of how it can be used to effectively analyze and control oscillations. This paper reviews state-of-the-art oscillatory stability monitoring, analysis, and control techniques reported in the published literature based on synchrophasor technology. An updated classification is presented for power system oscillations with a special emphasis on oscillations induced from PEC-interfaced renewable energy generation. Oscillatory stability analysis techniques based on synchrophasor technology are well established in power system engineering, but further research is required to effectively utilize synchrophasor based oscillatory stability monitoring, analysis and control techniques to characterize and mitigate PEC-induced oscillations. In particular, emerging big-data analytics techniques could be used on synchrophasor data streams to develop oscillatory stability monitoring, analysis and damping techniques.

ACS Style

Lasantha Gunaruwan Meegahapola; Siqi Bu; Darshana Prasad Wadduwage; Chi Yung Chung; Xinghuo Yu. Review on Oscillatory Stability in Power Grids With Renewable Energy Sources: Monitoring, Analysis, and Control Using Synchrophasor Technology. IEEE Transactions on Industrial Electronics 2020, 68, 519 -531.

AMA Style

Lasantha Gunaruwan Meegahapola, Siqi Bu, Darshana Prasad Wadduwage, Chi Yung Chung, Xinghuo Yu. Review on Oscillatory Stability in Power Grids With Renewable Energy Sources: Monitoring, Analysis, and Control Using Synchrophasor Technology. IEEE Transactions on Industrial Electronics. 2020; 68 (1):519-531.

Chicago/Turabian Style

Lasantha Gunaruwan Meegahapola; Siqi Bu; Darshana Prasad Wadduwage; Chi Yung Chung; Xinghuo Yu. 2020. "Review on Oscillatory Stability in Power Grids With Renewable Energy Sources: Monitoring, Analysis, and Control Using Synchrophasor Technology." IEEE Transactions on Industrial Electronics 68, no. 1: 519-531.

Journal article
Published: 01 January 2020 in Journal of Modern Power Systems and Clean Energy
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ACS Style

Ragini Patel; Lasantha Meegahapola; Liuping Wang; Xinghuo Yu; Brendan McGrath. Automatic Generation Control of Multi-area Power System with Network Constraints and Communication Delays. Journal of Modern Power Systems and Clean Energy 2020, 8, 454 -463.

AMA Style

Ragini Patel, Lasantha Meegahapola, Liuping Wang, Xinghuo Yu, Brendan McGrath. Automatic Generation Control of Multi-area Power System with Network Constraints and Communication Delays. Journal of Modern Power Systems and Clean Energy. 2020; 8 (3):454-463.

Chicago/Turabian Style

Ragini Patel; Lasantha Meegahapola; Liuping Wang; Xinghuo Yu; Brendan McGrath. 2020. "Automatic Generation Control of Multi-area Power System with Network Constraints and Communication Delays." Journal of Modern Power Systems and Clean Energy 8, no. 3: 454-463.

Journal article
Published: 01 January 2020 in IEEE Access
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ACS Style

Luis A. G. Gomez; Luis F. N. Lourenco; Ahda P. Grilo; M. B. C. Salles; Lasantha Meegahapola; A. J. Sguarezi Filho. Primary Frequency Response of Microgrid Using Doubly Fed Induction Generator With Finite Control Set Model Predictive Control Plus Droop Control and Storage System. IEEE Access 2020, 8, 189298 -189312.

AMA Style

Luis A. G. Gomez, Luis F. N. Lourenco, Ahda P. Grilo, M. B. C. Salles, Lasantha Meegahapola, A. J. Sguarezi Filho. Primary Frequency Response of Microgrid Using Doubly Fed Induction Generator With Finite Control Set Model Predictive Control Plus Droop Control and Storage System. IEEE Access. 2020; 8 ():189298-189312.

Chicago/Turabian Style

Luis A. G. Gomez; Luis F. N. Lourenco; Ahda P. Grilo; M. B. C. Salles; Lasantha Meegahapola; A. J. Sguarezi Filho. 2020. "Primary Frequency Response of Microgrid Using Doubly Fed Induction Generator With Finite Control Set Model Predictive Control Plus Droop Control and Storage System." IEEE Access 8, no. : 189298-189312.

Journal article
Published: 09 November 2019 in International Journal of Electrical Power & Energy Systems
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The dynamic characteristics of power grids have substantially evolved over the last two decades due to the large-scale integration of power-electronic converter (PEC)-interfaced renewable energy sources (RESs). Therefore, the impact of PEC-interfaced RESs on power system stability must be thoroughly examined. This paper comprehensively investigates the long-term voltage stability (LTVS) phenomenon with large-scale solar-photovoltaic (PV) generation. The reactive power characteristics and control schemes of the synchronous generator (SG) and solar-PV system are carefully analysed, as these characteristics significantly affect the voltage stability. First, the LTVS phenomenon is analysed using a simple test system. Time-domain simulations and dynamic reactive power-voltage (QV) curves at critical time-domain snapshots have been used to analyse the trajectory of the system operating point. Moreover, important parameters of the solar-PV system, such as the inverter rating, current limiting strategies, and reactive power gain are also thoroughly examined to characterize their impact on LTVS. The effect of variation in solar-irradiance and ambient temperature on LTVS is also studied in the paper. Finally, the effect of the solar-PV generation on LTVS is investigated using the Nordic test system. This study has shown that solar-PV systems with improved controllers could provide enhanced dynamic reactive power response, hence improve the LTVS. However, large-scale solar-PV systems have both beneficial and adverse impact on stressed power systems, and the nature of the impact depends on the relative loading level of the replaced over excitation limiter (OEL) activated SGs.

ACS Style

Enkhtsetseg Munkhchuluun; Lasantha Meegahapola; Arash Vahidnia. Long-term voltage stability with large-scale solar-photovoltaic (PV) generation. International Journal of Electrical Power & Energy Systems 2019, 117, 105663 .

AMA Style

Enkhtsetseg Munkhchuluun, Lasantha Meegahapola, Arash Vahidnia. Long-term voltage stability with large-scale solar-photovoltaic (PV) generation. International Journal of Electrical Power & Energy Systems. 2019; 117 ():105663.

Chicago/Turabian Style

Enkhtsetseg Munkhchuluun; Lasantha Meegahapola; Arash Vahidnia. 2019. "Long-term voltage stability with large-scale solar-photovoltaic (PV) generation." International Journal of Electrical Power & Energy Systems 117, no. : 105663.

Conference paper
Published: 01 September 2019 in 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe)
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In recent years, direct torque-control (DTC) based variable-speed drives (VSDs) have been widely used in broad-range of industrial and commercial applications. This is due to the fact that DTC based VSDs offer high-speed and torque precision compared to scalar control and vector control techniques. The DTC combines flux oriented control, i.e., both the flux and torque are directly controlled for high accuracy. This paper investigates the effect of low-frequency oscillations (LFOs) on DTC based VSD driven induction motors (IMs) under various disturbances in a hybrid AC/DC microgrid. The study has shown that when an electro-mechanical oscillation induced by a step change occurs at the VSD, it could give rise to speed and torque oscillations at the VSD driven IM; however, the dynamic response is far better than the direct-on-line (DOL) based IM. Furthermore, when a significant voltage dip occurs in the microgrid, it significantly affects the response of the VSD driven IM. The DC-link capacitor of the VSD reduces the effect of voltage variations at the PCC on the VSD driven IM. Thus, with a high DC-link capacitor, the VSD has a high capability to reduce the impact of voltage disruption. Furthermore, voltage and frequency oscillations created by load disturbances in microgrids could lead to power oscillations at the VSD driven IM.

ACS Style

Moudud Ahmed; Lasantha Meegahapola; Arash Vahidnia; Manoj Datta. Investigation of Low-Frequency Oscillations in VSD Driven Induction Motors in Microgrids. 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) 2019, 1 -5.

AMA Style

Moudud Ahmed, Lasantha Meegahapola, Arash Vahidnia, Manoj Datta. Investigation of Low-Frequency Oscillations in VSD Driven Induction Motors in Microgrids. 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe). 2019; ():1-5.

Chicago/Turabian Style

Moudud Ahmed; Lasantha Meegahapola; Arash Vahidnia; Manoj Datta. 2019. "Investigation of Low-Frequency Oscillations in VSD Driven Induction Motors in Microgrids." 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) , no. : 1-5.

Conference paper
Published: 01 September 2019 in 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe)
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This paper investigates the stability of a hybrid AC/DC microgrid considering a range of reactance ( $X$ ) to resistance ( $R$ ) ratios for microgrid cables. The study has specifically investigated the influence of $X/R$ ratio on induction machine (IM) rotor speed oscillations, voltage & frequency oscillations using both theoretical analysis and non-linear dynamic simulations under various disturbances in the hybrid AC/DC microgrid. Majority of the distributed energy resources (DERs) and the energy storage system (ESS) controllers are designed by assuming that the microgrid cables are either inductive or resistive, and then investigated the dynamic performance of the hybrid AC/DC microgrid by varying the $X/R$ ratio of cables while maintaining the cable impedance constant. The theoretical analysis indicates that the frequency can be controlled by the reactive power in a microgrid with resistive cables, while the frequency can be controlled via the active power in a microgrid with inductive cables. Any disturbance in the AC sub-grid create power imbalance, which causes IM rotor speed, voltage & frequency oscillations, and these issues are even more severe when the microgrid cables are becoming resistive as all the controllers are designed assuming inductive cables and vice-versa. Furthermore, the disturbances in the AC sub-grid propagate through the inter-linking converter (ILC) into the DC sub-grid and can cause DC bus voltage oscillations. Therefore, the DC sub-grid also affected by the $X/R$ ratio of the cables in the AC sub-grid.

ACS Style

Moudud Ahmed; Lasantha Meegahapola; Arash Vahidnia; Manoj Datta. Analyzing the Effect of X/R ratio on Dynamic Performance of Microgrids. 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) 2019, 1 -5.

AMA Style

Moudud Ahmed, Lasantha Meegahapola, Arash Vahidnia, Manoj Datta. Analyzing the Effect of X/R ratio on Dynamic Performance of Microgrids. 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe). 2019; ():1-5.

Chicago/Turabian Style

Moudud Ahmed; Lasantha Meegahapola; Arash Vahidnia; Manoj Datta. 2019. "Analyzing the Effect of X/R ratio on Dynamic Performance of Microgrids." 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) , no. : 1-5.

Journal article
Published: 19 August 2019 in IEEE Access
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The voltage-source converter (VSC) based multi-terminal direct-current (MTDC) networks are currently being developed in large-scale power grids for efficient and economical transmission of electrical energy generated from remotely sited renewable energy sources (RESs). As the MTDC network is developed alongside the conventional AC grid, it has transformed the power grid to a hybrid AC/MTDC power network. However, since the MTDC network is controlled via the power electronic converters (PECs), it significantly affects the AC power grid damping and synchronising performance as it decouples the natural dynamics between various electro-mechanical systems in the power grid. This paper proposes a supplementary control scheme to improve the damping performance of the entire hybrid AC/MTDC power grid. The damping torque analysis (DTA) technique is used as the primary technique to develop the supplementary control scheme. The preliminary analysis is carried out using a two-terminal hybrid AC/DC power grid and has suggested a supplementary control loop based on the rotor speed deviation for the DC voltage controller of the VSC to improve the damping performance. With the state-space model, the synchronising and damping torque coefficients are calculated and accordingly, the feedback gain is determined to provide optimal synchronising and damping torque components. Subsequently, the fidelity of the supplementary controller was verified using a four-terminal hybrid AC/MTDC grid. Simulation studies proved that the proposed supplementary controller could improve the hybrid AC/MTDC network damping performance, and it performed very effectively with the master-slave control and the conventional droop control scheme.

ACS Style

Mingchen Gu; Lasantha Meegahapola; Khoi Loon Wong. Damping Performance Analysis and Control of Hybrid AC/Multi-Terminal DC Power Grids. IEEE Access 2019, 7, 118712 -118726.

AMA Style

Mingchen Gu, Lasantha Meegahapola, Khoi Loon Wong. Damping Performance Analysis and Control of Hybrid AC/Multi-Terminal DC Power Grids. IEEE Access. 2019; 7 (99):118712-118726.

Chicago/Turabian Style

Mingchen Gu; Lasantha Meegahapola; Khoi Loon Wong. 2019. "Damping Performance Analysis and Control of Hybrid AC/Multi-Terminal DC Power Grids." IEEE Access 7, no. 99: 118712-118726.

Journal article
Published: 28 June 2019 in IEEE Transactions on Power Systems
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This document is a summary of a report prepared by the IEEE PES Task Force (TF) on Microgrid Stability Definitions, Analysis, and Modeling \cite{task}, which defines concepts and identifies relevant issues related to stability in microgrids. In this paper, definitions and classification of microgrid stability are presented and discussed, considering pertinent microgrid features such as voltage-frequency dependency, unbalancing, low inertia, and generation intermittency. A few examples are also presented, highlighting some of the stability classes defined in the paper. Further examples, along with discussions on microgrid components modeling and stability analysis tools can be found in the TF report.

ACS Style

Mostafa Farrokhabadi; Claudio A. Canizares; John William Simpson-Porco; Ehsan Nasr; Lingling Fan; Patricio A. Mendoza-Araya; Reinaldo Tonkoski; Ujjwol Tamrakar; Nikos D. Hatziargyriou; Dimitris Lagos; Richard W. Wies; Mario Paolone; Marco Liserre; Lasantha Meegahapola; Mahmoud Kabalan; Amir H. Hajimiragha; Dario Peralta; Marcelo A. Elizondo; Kevin Paul Schneider; Francis K. Tuffner; James T. Reilly. Microgrid Stability Definitions, Analysis, and Examples. IEEE Transactions on Power Systems 2019, 35, 13 -29.

AMA Style

Mostafa Farrokhabadi, Claudio A. Canizares, John William Simpson-Porco, Ehsan Nasr, Lingling Fan, Patricio A. Mendoza-Araya, Reinaldo Tonkoski, Ujjwol Tamrakar, Nikos D. Hatziargyriou, Dimitris Lagos, Richard W. Wies, Mario Paolone, Marco Liserre, Lasantha Meegahapola, Mahmoud Kabalan, Amir H. Hajimiragha, Dario Peralta, Marcelo A. Elizondo, Kevin Paul Schneider, Francis K. Tuffner, James T. Reilly. Microgrid Stability Definitions, Analysis, and Examples. IEEE Transactions on Power Systems. 2019; 35 (1):13-29.

Chicago/Turabian Style

Mostafa Farrokhabadi; Claudio A. Canizares; John William Simpson-Porco; Ehsan Nasr; Lingling Fan; Patricio A. Mendoza-Araya; Reinaldo Tonkoski; Ujjwol Tamrakar; Nikos D. Hatziargyriou; Dimitris Lagos; Richard W. Wies; Mario Paolone; Marco Liserre; Lasantha Meegahapola; Mahmoud Kabalan; Amir H. Hajimiragha; Dario Peralta; Marcelo A. Elizondo; Kevin Paul Schneider; Francis K. Tuffner; James T. Reilly. 2019. "Microgrid Stability Definitions, Analysis, and Examples." IEEE Transactions on Power Systems 35, no. 1: 13-29.

Proceedings article
Published: 01 June 2019 in 2019 IEEE 28th International Symposium on Industrial Electronics (ISIE)
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This paper presents the magnetic equivalent circuit modelling (MEC) and simulation of flux switching machines (FSMs) that can be applied to a FSM with any number of rotor poles and stator teeth. The paper focuses on modelling the air-gap permeance between one rotor pole and one stator tooth and its variation with rotor position. This modular magnetic equivalent circuit (MEC) model is then used to implement a full FSM model iterating it for all the combinations of rotor poles and stator teeth in an FSM. The full MEC model is simulated and the results are compared with finite element simulations.

ACS Style

Subrato Saha; Nuwantha Fernando; Rekha Jayarajan; Lasantha Meegahapola. FSM Stator Tooth to Rotor Pole MEC Modelling and Full Machine Simulation. 2019 IEEE 28th International Symposium on Industrial Electronics (ISIE) 2019, 330 -335.

AMA Style

Subrato Saha, Nuwantha Fernando, Rekha Jayarajan, Lasantha Meegahapola. FSM Stator Tooth to Rotor Pole MEC Modelling and Full Machine Simulation. 2019 IEEE 28th International Symposium on Industrial Electronics (ISIE). 2019; ():330-335.

Chicago/Turabian Style

Subrato Saha; Nuwantha Fernando; Rekha Jayarajan; Lasantha Meegahapola. 2019. "FSM Stator Tooth to Rotor Pole MEC Modelling and Full Machine Simulation." 2019 IEEE 28th International Symposium on Industrial Electronics (ISIE) , no. : 330-335.

Conference paper
Published: 01 June 2019 in 2019 IEEE 10th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
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An essential element of a distributed generation microgrid is an energy storage system that can accommodate the intermittency of the microgrid’s renewable energy sources. Hydrogen energy storage systems (HESS), comprising an electrolyser and a fuel-cell, offer an attractive and green alternative for such a storage option, but care must be taken to avoid AC energy flow out of the fuel cell to prevent internal cell degradation. This is particularly important for single-phase microgrids, where the AC load current creates a double fundamental frequency harmonic current in the inverter DC bus. In this paper, the fuel-cell power flow is decoupled from this harmonic current flow by linking a capacitive energy buffer to the DC bus through a third phase leg on the inverter. This allows the inverter DC bus capacitance to be substantially reduced, thus improving the long-term reliability and robustness of the inverter and avoiding fuel-cell degradation. The concept has been proven by simulation and matching experimental results.

ACS Style

Anima Ganeshan; D.G Holmes; Lasantha Meegahapola; Brendan McGrath. Ripple Energy Buffer for Microgrid Connected Hydrogen Energy Storage System. 2019 IEEE 10th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) 2019, 634 -641.

AMA Style

Anima Ganeshan, D.G Holmes, Lasantha Meegahapola, Brendan McGrath. Ripple Energy Buffer for Microgrid Connected Hydrogen Energy Storage System. 2019 IEEE 10th International Symposium on Power Electronics for Distributed Generation Systems (PEDG). 2019; ():634-641.

Chicago/Turabian Style

Anima Ganeshan; D.G Holmes; Lasantha Meegahapola; Brendan McGrath. 2019. "Ripple Energy Buffer for Microgrid Connected Hydrogen Energy Storage System." 2019 IEEE 10th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) , no. : 634-641.

Proceedings article
Published: 01 June 2019 in 2019 IEEE Milan PowerTech
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Distributed generation (DG) has gained popularity among electricity end users who are determined to contribute to a cleaner environment by conforming to green and sustainable energy sources for various daily needs. The power system impact of such trends (e.g. roof-top solar-PV) need thorough investigation, such as impact on fault current levels on the distribution network. Varying fault current levels could adversely affect the operation of protection relays, which may lead to localized blackouts. Therefore, it is imperative to avoid localised blackouts due to mal-operation of protective relays under high penetration of DGs in distribution network. The focus of this research is to study the importance and implications of protective relays and over-current protection in the presence of distributed generation; where the impact of distributed generation on distribution network is identified. Relay coordination is observed to determine their operation characteristics to avoid mal-operation with the presence of DGs (e.g. solar-PV). This paper uses the UK generic distribution network model to simulate different scenarios in DIgSILENT Power Factory. The resulting power quality measures, such as voltage levels, short-circuit current levels and frequency are presented and discussed in the paper. The research highlights that small-scale DG penetration allows for existing protection infrastructure to continue operation and expensive upgrades for overall network are not required as fault levels remain the same.

ACS Style

Muhammad Akmal; Faris Al-Naemi; Nusrat Iqbal; Anas Al Tarabsheh; Lasantha Meegahapola. Impact of Distributed PV Generation on Relay Coordination and Power Quality. 2019 IEEE Milan PowerTech 2019, 1 -6.

AMA Style

Muhammad Akmal, Faris Al-Naemi, Nusrat Iqbal, Anas Al Tarabsheh, Lasantha Meegahapola. Impact of Distributed PV Generation on Relay Coordination and Power Quality. 2019 IEEE Milan PowerTech. 2019; ():1-6.

Chicago/Turabian Style

Muhammad Akmal; Faris Al-Naemi; Nusrat Iqbal; Anas Al Tarabsheh; Lasantha Meegahapola. 2019. "Impact of Distributed PV Generation on Relay Coordination and Power Quality." 2019 IEEE Milan PowerTech , no. : 1-6.

Research article
Published: 10 April 2019 in IET Generation, Transmission & Distribution
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The microgrid concept has gained enormous popularity in the power industry due to recent advances in the power electronic converter (PEC) technology and environmental concerns over green-house gas emissions from power generation. Among microgrids, the hybrid AC/DC microgrid concept has been promoted as a viable concept to reduce energy conversion losses. However, hybrid AC/DC microgrids are susceptible to stability issues during high penetration of dynamic loads (e.g. induction machines). The non-linear dynamics of induction machines result in sustained voltage/frequency oscillations following disturbances in the microgrid, which is a major challenge for stable operation of the hybrid AC/DC microgrid. The PEC-based energy storage systems (ESSs) are used as an effective solution for power balancing in the microgrid; hence with the fast response of the PEC, microgrid voltage/frequency could be stabilised rapidly. Thus, a supplementary power oscillation damping (POD) controller is proposed in this paper for the ESS to damp low-frequency oscillations (LFOs) in the hybrid AC/DC microgrid. The effectiveness of the proposed damping controller is verified using non-linear simulations considering different penetration levels of dynamic loads and disturbances in a hybrid AC/DC microgrid. Results indicate that the proposed supplementary POD controller can significantly damp the LFOs in the hybrid AC/DC microgrid.

ACS Style

Moudud Ahmed; Lasantha Meegahapola; Arash Vahidnia; Manoj Datta. Analysis and mitigation of low‐frequency oscillations in hybrid AC/DC microgrids with dynamic loads. IET Generation, Transmission & Distribution 2019, 13, 1477 -1488.

AMA Style

Moudud Ahmed, Lasantha Meegahapola, Arash Vahidnia, Manoj Datta. Analysis and mitigation of low‐frequency oscillations in hybrid AC/DC microgrids with dynamic loads. IET Generation, Transmission & Distribution. 2019; 13 (9):1477-1488.

Chicago/Turabian Style

Moudud Ahmed; Lasantha Meegahapola; Arash Vahidnia; Manoj Datta. 2019. "Analysis and mitigation of low‐frequency oscillations in hybrid AC/DC microgrids with dynamic loads." IET Generation, Transmission & Distribution 13, no. 9: 1477-1488.