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Prof. Dr. Ashwin M Khambadkone
Department of Electrical and Computer Engineering, National University of Singapore, Central Library Annexe, 15 Kent Ridge Road, 119225 Singapore

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0 Power Electronics
0 microgrids
0 Energy Storage Systems
0 power system dynamics
0 renewable energy system

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Journal article
Published: 09 June 2020 in IEEE Transactions on Sustainable Energy
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High penetration of renewables in the distribution network brings significant uncertainties, especially during volatile weather conditions. Hence, the network controllers should be designed to account for these uncertainties and respond to unpredictable events like voltage-dips for reliable voltage control. This paper proposes a control scheme where inverter-based Distributed Energy Resources (DERs) respond locally with Q(V) control and adapt to set-points assigned by the centralized controller (CC). The Robust Constrained Model Predictive Control (RCMPC) scheme is proposed for centralized voltage control. The RCMPC robustly deploys control resources from DERs and tap-changers to regulate the lower/upper bound of node voltages within the targeted limit. Moreover, it ensures minimum resource utilization by relaxing the targeted voltage limit whenever it anticipates significant uncertainties. The CC is implemented in Python, which communicates with the RMS model of the UKGDS network for measurements and dispatching set-points. The performance of RCMPC is compared with deterministic MPC (DMCP) at 5, 10, and 15-minute time-steps of CC. The proposed RCMPC was able to regulate the node voltage even at a higher degree of uncertainty seen at a 15-minute time-step. In contrast, the DMPC could not contain the node voltages under the targeted limit and worsened at a larger time-step.

ACS Style

Salish Maharjan; Ashwin M. Khambadkone; Jimmy Chih-Hsien Peng. Robust Constrained Model Predictive Voltage Control in Active Distribution Networks. IEEE Transactions on Sustainable Energy 2020, 12, 400 -411.

AMA Style

Salish Maharjan, Ashwin M. Khambadkone, Jimmy Chih-Hsien Peng. Robust Constrained Model Predictive Voltage Control in Active Distribution Networks. IEEE Transactions on Sustainable Energy. 2020; 12 (1):400-411.

Chicago/Turabian Style

Salish Maharjan; Ashwin M. Khambadkone; Jimmy Chih-Hsien Peng. 2020. "Robust Constrained Model Predictive Voltage Control in Active Distribution Networks." IEEE Transactions on Sustainable Energy 12, no. 1: 400-411.

Conference paper
Published: 01 November 2018 in 2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC)
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In a Ship-based power system, depending on the type of ship and its operation, load profile could be very dynamic. The dynamic load demand is met by the use of multiple diesel-generators running in parallel with higher than normal ramping. These generators are typically oversized to meet the highly dynamic load demand. During the period of low demand, generators are operated on a suboptimal loading point. This leads to increased fuel consumption and higher mechanical stress on the generators which makes the operation inefficient. Using an energy storage system as a buffer allows operation of generators in their cost-efficient point making the overall operation cost and energy efficient. This paper addresses the selection of type and size of the energy storage system for a ship electrical power system. Firstly, the optimal operating strategy based on a multiobjective cost function for a different combination of storage systems have been formulated. Secondly, the best-suited energy storage system are determined by comparing parameters like the fuel consumption, capital cost, replacement cost and size for a target operational life of 5 years. Results show that an energy storage system not only reduces the fuel consumption but also restricts the operation of generators beyond their normal operating limits.

ACS Style

Rahul Bhujade; Ashwin M. Khambadkone; Salish Maharjan; Zaki Mohzani. Optimal Operation and Sizing of Energy Storage System for a Ship Electrical Power System. 2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC) 2018, 1 -6.

AMA Style

Rahul Bhujade, Ashwin M. Khambadkone, Salish Maharjan, Zaki Mohzani. Optimal Operation and Sizing of Energy Storage System for a Ship Electrical Power System. 2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC). 2018; ():1-6.

Chicago/Turabian Style

Rahul Bhujade; Ashwin M. Khambadkone; Salish Maharjan; Zaki Mohzani. 2018. "Optimal Operation and Sizing of Energy Storage System for a Ship Electrical Power System." 2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC) , no. : 1-6.

Proceedings article
Published: 01 May 2018 in 2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)
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The Variable Speed Drives (VSD) are anticipated to replace the Induction Motors (IM) by 50%, in 2020, in developed cities of Europe [1]. Therefore, it is essential to incorporate VSD loads while analyzing voltage stability studies in the distribution network with high PV penetration. The collective load response from VSD loads tend to slow the rate of change of node voltages of distribution system, during the PV ramping events. However, this dynamic load characteristic of VSD is dependent on its capacitor size. Meanwhile, there is trend for reducing the capacitor size in VSD load at equipment level. Thus, this paper investigates the impact of reducing DC capacitor size in VSD load, on voltage stability of distribution system during PV ramping events. For the investigation, the paper involves United Kingdom General Distribution System (UKGDS) where load is modeled with combination of static load, IM, and VSD. It is determined that the maximum PV penetration reduces from 80% to 50% when the capacitor size in VSD is lowered from 360 μF/kW to 25μF/kW respectively. Furthermore, the increased VSD penetration could delay and even avert the voltage collapse from PV ramping events during grid contingency condition. It is revealed that the minimum VSD penetration required to avert instability during such condition, even at 100% PV penetration, increases from 50% to 65% when the capacitor size of VSD is reduced from 360 μF/kW to 25μF/kW respectively.

ACS Style

Salish Maharjan; Ashwin M. Khambadkone; Jian-Xin Xu. Probing the Impact of Reduced DC Capacitor Size in Variable Speed Drive Loads on Voltage Stability of the Distribution Network at High PV Penetration. 2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) 2018, 220 -225.

AMA Style

Salish Maharjan, Ashwin M. Khambadkone, Jian-Xin Xu. Probing the Impact of Reduced DC Capacitor Size in Variable Speed Drive Loads on Voltage Stability of the Distribution Network at High PV Penetration. 2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia). 2018; ():220-225.

Chicago/Turabian Style

Salish Maharjan; Ashwin M. Khambadkone; Jian-Xin Xu. 2018. "Probing the Impact of Reduced DC Capacitor Size in Variable Speed Drive Loads on Voltage Stability of the Distribution Network at High PV Penetration." 2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) , no. : 220-225.

Conference paper
Published: 01 December 2017 in 2017 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia)
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An important consideration for the design of micro- grid for an uninterruptible infrastructure is the ability to ensure its continual operation regardless of the health of the utility grid. This paper proposes a multiple layer power security design concept for re-designing of such an uninterruptible electrical network with an improved reliability and sustainability by integrating with renewable resources and energy storage systems. The re-designed microgrid network and the control scheme were modelled and simulated in PowerFactory. Potential problems during the network re-design such as protection discrimination and power factor degradation due to high PV penetration have been analysed and solutions have been provided. System performance of the re-designed network has been evaluated through various test cases.

ACS Style

Samson Shih; Xin Kong; Chia Meng Hwee; Ashwin M Khambadkone; Chua Hian Koon; Teh Siaw Peng; Tan Hang Kiang. A multiple layer power security design for a typical microgrid infrastructure with improved reliability and sustainability. 2017 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia) 2017, 1 -6.

AMA Style

Samson Shih, Xin Kong, Chia Meng Hwee, Ashwin M Khambadkone, Chua Hian Koon, Teh Siaw Peng, Tan Hang Kiang. A multiple layer power security design for a typical microgrid infrastructure with improved reliability and sustainability. 2017 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia). 2017; ():1-6.

Chicago/Turabian Style

Samson Shih; Xin Kong; Chia Meng Hwee; Ashwin M Khambadkone; Chua Hian Koon; Teh Siaw Peng; Tan Hang Kiang. 2017. "A multiple layer power security design for a typical microgrid infrastructure with improved reliability and sustainability." 2017 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia) , no. : 1-6.

Conference paper
Published: 01 June 2017 in 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia)
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In addition to random power fluctuation, the unpredictable high ramp rate is another uncertainty of Photovoltaic (PV) power output. It increases the requirement of both the amount and response speed of operation reserves at different time scale in the grid. The fast fluctuation of PV needs to be compensated by frequent ramp up and down reserves. Traditional generators will face heavy wear and tear to provide such support. While energy storage system (ESS) can provide fast bidirectional power support, ESS' response time and duration differs for various technology and material, and are suitable to provide reserve at different time scale. In this paper, a multiple ESS solution is proposed to suppress the PV ramp rate at different time scale. An optimal coordinated control strategy is developed to minimize the operation cost of the multiple storage system. Instead of suppressing ramp rate at individual time scale, the proposed control strategy coordinates multiple storage to control ramp rate at different time scale in one problem. In this way, the contribution of one time scale's ramp rate control to other time scale's ramp rate is considered. Using the coordinated control strategy, the required ESS capacity can be reduced. It can also minimize the PV and ESS system operation cost subject to grid regulation on ramp rate. The control algorithm has been demonstrated using a triple-input ESS example and its effectiveness have been studied. The results show the effectiveness of the proposed control in regulating ramp rate at different time scale.

ACS Style

Qian Zhao; Liang Xian; Sudhin Roy; Xin Kong; Ashwin M Khambadkone. Optimal control of PV ramp rate using multiple energy storage system. 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia) 2017, 928 -931.

AMA Style

Qian Zhao, Liang Xian, Sudhin Roy, Xin Kong, Ashwin M Khambadkone. Optimal control of PV ramp rate using multiple energy storage system. 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia). 2017; ():928-931.

Chicago/Turabian Style

Qian Zhao; Liang Xian; Sudhin Roy; Xin Kong; Ashwin M Khambadkone. 2017. "Optimal control of PV ramp rate using multiple energy storage system." 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia) , no. : 928-931.

Conference paper
Published: 01 October 2016 in 2016 International Conference on Probabilistic Methods Applied to Power Systems (PMAPS)
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As Photovoltaic (PV) penetration level rapidly increases in the modern power systems, the adoption of energy storage systems (ESS) is a preferred option to control the rapid and unpredictable PV power fluctuations. It is desired to develop new reliability evaluation methods that can model and evaluate the reliability impact of these new entries. This paper has proposed an area risk based method that can take into account the PV intermittence and ESS operations when evaluating the unit commitment risk (UCR). The rapid changes of PV power is accounted for every 5-minute interval during the lead time. A control algorithm for the ESS is also developed and integrated into the evaluation of UCR. The method is applied to quantify the effects of different ESS capacities on the system's load carrying capability. System planners can utilize this method to determine the proper ESS installation for a system with given PV penetration level. This method is also useful for system operators to decide on the required committed units as well as the charging and discharging power of ESS given PV fluctuation.

ACS Style

Wei Jia Tay; Qian Zhao; Ashwin M Khambadkone. Unit commitment risk evaluation of power systems with PV and energy storage. 2016 International Conference on Probabilistic Methods Applied to Power Systems (PMAPS) 2016, 1 -6.

AMA Style

Wei Jia Tay, Qian Zhao, Ashwin M Khambadkone. Unit commitment risk evaluation of power systems with PV and energy storage. 2016 International Conference on Probabilistic Methods Applied to Power Systems (PMAPS). 2016; ():1-6.

Chicago/Turabian Style

Wei Jia Tay; Qian Zhao; Ashwin M Khambadkone. 2016. "Unit commitment risk evaluation of power systems with PV and energy storage." 2016 International Conference on Probabilistic Methods Applied to Power Systems (PMAPS) , no. : 1-6.

Proceedings article
Published: 01 September 2016 in 2016 IEEE Energy Conversion Congress and Exposition (ECCE)
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With increasing PV power penetration in the modern power grid, a cost-effective solution to address PV intermittency becomes more and more compelling. The ramp rate of PV power can reach 60% of its rated capacity in just 30 seconds. Energy storage is a technically feasible solution to suppress the adverse impacts of injecting intermittent power output with such a high ramp rate into the grid, but its cost is very high. Therefore, to reduce the system cost of integrating PV and maximize the grid operation profit, optimal sizing of energy storage is necessary. In this paper, a method of optimizing energy storage size for controlling PV ramp rate is presented. The characteristics of PV ramp rate are first investigated. Based on the results, an energy dispatch model for controlling PV ramp rate with fast response energy storage is developed. The optimal size of energy storage which minimizes system operation cost to accommodate high PV penetration is subsequently determined.

ACS Style

Qian Zhao; Kunna Wu; Ashwin M Khambadkone. Optimal sizing of energy storage for PV power ramp rate regulation. 2016 IEEE Energy Conversion Congress and Exposition (ECCE) 2016, 1 -6.

AMA Style

Qian Zhao, Kunna Wu, Ashwin M Khambadkone. Optimal sizing of energy storage for PV power ramp rate regulation. 2016 IEEE Energy Conversion Congress and Exposition (ECCE). 2016; ():1-6.

Chicago/Turabian Style

Qian Zhao; Kunna Wu; Ashwin M Khambadkone. 2016. "Optimal sizing of energy storage for PV power ramp rate regulation." 2016 IEEE Energy Conversion Congress and Exposition (ECCE) , no. : 1-6.

Proceedings article
Published: 01 September 2016 in 2016 IEEE Energy Conversion Congress and Exposition (ECCE)
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Battery Energy Storage Systems (BESS) have gained extensive application in both grid and microgrid applications. One major type of BESS are electrochemical batteries such as Lead-Acid and Lithium-Ion batteries which have limited number of lifecycles. The common way of considering their operation cost is using a constant value such as LCOE (levelized cost of energy). However, as shown herein, given the same amount of energy output, the battery lifecycle degradation, and thus the degradation cost, can vary at different operation conditions (voltage, current, power, state of charge (SOC)) by up to 6 times. Herein a model for the dynamic battery operation cost as a function of its dispatch power and SOC is developed. The model also considers the dependency of battery voltage on its current and SOC, which equivalently takes into account the dependency of its conversion efficiency on its power and SOC. Preliminary simulations demonstrate that using the proposed model, instead of the LCOE, for Microgrid operation optimization microgrid operation cost is lower by up to 12%.

ACS Style

Aniq Ahsan; Qian Zhao; Ashwin M Khambadkone; Meng Hwee Chia. Dynamic battery operational cost modeling for energy dispatch. 2016 IEEE Energy Conversion Congress and Exposition (ECCE) 2016, 1 -5.

AMA Style

Aniq Ahsan, Qian Zhao, Ashwin M Khambadkone, Meng Hwee Chia. Dynamic battery operational cost modeling for energy dispatch. 2016 IEEE Energy Conversion Congress and Exposition (ECCE). 2016; ():1-5.

Chicago/Turabian Style

Aniq Ahsan; Qian Zhao; Ashwin M Khambadkone; Meng Hwee Chia. 2016. "Dynamic battery operational cost modeling for energy dispatch." 2016 IEEE Energy Conversion Congress and Exposition (ECCE) , no. : 1-5.

Journal article
Published: 16 September 2015 in Energies
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This paper describes the Experimental Power Grid Centre (EPGC) microgrid test facility, which was developed to enable research, development and testing for a wide range of distributed generation and microgrid technologies. The EPGC microgrid facility comprises a integrated electrical and thermal grid with a flexible and configurable architecture, and includes various distributed energy resources and emulators, such as generators, renewable, energy storage technologies and programmable load banks. The integrated thermal grid provides an opportunity to harness waste heat produced by the generators for combined heat, power and cooling applications, and support research in optimization of combined electrical-thermal systems. Several case studies are presented to demonstrate the testing of different control and operation strategies for storage systems in grid-connected and islanded microgrids. One of the case studies also demonstrates an integrated thermal grid to convert waste heat to useful energy, which thus far resulted in a higher combined energy efficiency. Experiment results confirm that the facility enables testing and evaluation of grid technologies and practical problems that may not be apparent in a computer simulated environment.

ACS Style

Sundar Raj Thangavelu; Inam Ullah Nutkani; Chia Meng Hwee; Aung Myat; Ashwin Khambadkone. Integrated Electrical and Thermal Grid Facility - Testing of Future Microgrid Technologies. Energies 2015, 8, 10082 -10105.

AMA Style

Sundar Raj Thangavelu, Inam Ullah Nutkani, Chia Meng Hwee, Aung Myat, Ashwin Khambadkone. Integrated Electrical and Thermal Grid Facility - Testing of Future Microgrid Technologies. Energies. 2015; 8 (9):10082-10105.

Chicago/Turabian Style

Sundar Raj Thangavelu; Inam Ullah Nutkani; Chia Meng Hwee; Aung Myat; Ashwin Khambadkone. 2015. "Integrated Electrical and Thermal Grid Facility - Testing of Future Microgrid Technologies." Energies 8, no. 9: 10082-10105.

Journal article
Published: 01 September 2015 in Applied Energy
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ACS Style

Sundar Raj Thangavelu; Ashwin Khambadkone; Iftekhar Karimi. Long-term optimal energy mix planning towards high energy security and low GHG emission. Applied Energy 2015, 154, 959 -969.

AMA Style

Sundar Raj Thangavelu, Ashwin Khambadkone, Iftekhar Karimi. Long-term optimal energy mix planning towards high energy security and low GHG emission. Applied Energy. 2015; 154 ():959-969.

Chicago/Turabian Style

Sundar Raj Thangavelu; Ashwin Khambadkone; Iftekhar Karimi. 2015. "Long-term optimal energy mix planning towards high energy security and low GHG emission." Applied Energy 154, no. : 959-969.

Conference paper
Published: 01 March 2015 in 2015 IEEE Applied Power Electronics Conference and Exposition (APEC)
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This paper investigates some 6.6kV 5-level converter topologies, including 5-level neutral point clamped converter (NPC-5L), 5-level flying capacitor converter (FC-5L), 5-level active neutral point clamped converter (ANPC-5L) and 5-level hybrid converter, on the basis of state-of-the-art 4.5kV insulated gate bipolar transistors (IGBT). Semiconductor loss and capacitor loss distribution are compared under same equivalent switching frequency, with In-Phase Disposition (IPD) modulation method, which ensures a similar complexity of control implementation. In order to evaluate the performance and characteristics of these topologies, a 5-level as well as a 7-level cascaded H-bridge converter (CHB) with multiple isolated DC sources are also considered. Results show that except for hybrid type, all other 5-level converters have similar conduction loss, which is mainly determined by the number of switching devices in the current path. Switching loss in ANPC-5L is higher than NPC-5L and FC-5L due to its extra switching during zero crossing periods. On the other hand, capacitors loss in FC-5L is more significant than other topologies. By comparing the loss distribution with that in CHB, it can be known that there are still some margins in topology design for improvement to reduce the converter switching loss and capacitors loss, if high efficiency is the target.

ACS Style

Zhang Hui; Ashwin M. Khambadkone; Ogura Kazuya. Investigation and loss comparison of 6.6kV 5-level converters. 2015 IEEE Applied Power Electronics Conference and Exposition (APEC) 2015, 297 -303.

AMA Style

Zhang Hui, Ashwin M. Khambadkone, Ogura Kazuya. Investigation and loss comparison of 6.6kV 5-level converters. 2015 IEEE Applied Power Electronics Conference and Exposition (APEC). 2015; ():297-303.

Chicago/Turabian Style

Zhang Hui; Ashwin M. Khambadkone; Ogura Kazuya. 2015. "Investigation and loss comparison of 6.6kV 5-level converters." 2015 IEEE Applied Power Electronics Conference and Exposition (APEC) , no. : 297-303.

Journal article
Published: 01 January 2015 in The Journal of The Institute of Electrical Engineers of Japan
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ACS Style

Ashwin M Khambadkone; Sim Wee Leng Sandy; Alex Chong. Experimental Power Grid Centre-An A*STAR Centre for Power Engineering Research. The Journal of The Institute of Electrical Engineers of Japan 2015, 135, 157 -160.

AMA Style

Ashwin M Khambadkone, Sim Wee Leng Sandy, Alex Chong. Experimental Power Grid Centre-An A*STAR Centre for Power Engineering Research. The Journal of The Institute of Electrical Engineers of Japan. 2015; 135 (3):157-160.

Chicago/Turabian Style

Ashwin M Khambadkone; Sim Wee Leng Sandy; Alex Chong. 2015. "Experimental Power Grid Centre-An A*STAR Centre for Power Engineering Research." The Journal of The Institute of Electrical Engineers of Japan 135, no. 3: 157-160.

Journal article
Published: 13 August 2014 in IEEE Transactions on Industry Applications
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We have developed a technique using the matrix pencil method (MPM), which was augmented with an ellipse fitting algorithm, that can classify three-phase voltage dips only using subcycle voltage data. This technique uses the MPM to extract the fundamental frequency components and reconstructs the fundamental voltage space vector that often changes into an ellipse during a fault. This ellipse's parameters are then estimated by an ellipse fitting algorithm to classify the dip. We have demonstrated that this technique can differentiate between highly distorted and similar voltage dips only using a quarter-cycle of data, which is equivalent to 5 ms in a 50-Hz alternating-current system. This method is further improved by prefiltering and downsampling the data to reduce the computation time and is implemented on a National Instruments CompactRIO platform. This system classified the dip in real time at about 10-12 ms after fault detection when tested with reproduced fault voltage waveforms amplified to a voltage level of 415 V. Our method thus executes faster than the conventional method of the fast Fourier transform that requires at least a full fundamental cycle time of 20 ms. This technique serves as a method of analyzing subcycle voltage dip phenomena and can be potentially extended to other fast subcycle electrical events.

ACS Style

Meng Hwee Chia; Ashwin Khambadkone. Subcycle Voltage Dip Classification Using Matrix Pencil Method With Ellipse Fitting Algorithm. IEEE Transactions on Industry Applications 2014, 51, 1660 -1668.

AMA Style

Meng Hwee Chia, Ashwin Khambadkone. Subcycle Voltage Dip Classification Using Matrix Pencil Method With Ellipse Fitting Algorithm. IEEE Transactions on Industry Applications. 2014; 51 (2):1660-1668.

Chicago/Turabian Style

Meng Hwee Chia; Ashwin Khambadkone. 2014. "Subcycle Voltage Dip Classification Using Matrix Pencil Method With Ellipse Fitting Algorithm." IEEE Transactions on Industry Applications 51, no. 2: 1660-1668.

Conference paper
Published: 01 September 2013 in 2013 IEEE Energy Conversion Congress and Exposition
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Matrix Pencil Method (MPM) has been applied to sub-cycle information of space vector and zero-sequence voltage to classify voltage dip phenomena. The feature extraction performance of MPM using different sampling window width has been statistically analyzed and found to perform relatively well between 0.1 and 1 cycle of a damped complex sinusoidal signal. The results show that MPM is able to estimate the fundamental frequency space vector even in highly distorted signals. The space vector ellipse's estimation is further enhanced by augmenting an ellipse fitting algorithm to MPM. This enhanced method differentiated between two highly similar two-phase voltage dips using only a quarter-cycle of data, demonstrating the feasibility of this scheme. This is demonstrated in a fault simulation on IEEE 34-bus system using a 5 ms sampling window.

ACS Style

Meng Hwee Chia; Ashwin M. Khambadkone. Application of Matrix pencil method in sub-cycle voltage dip classification. 2013 IEEE Energy Conversion Congress and Exposition 2013, 2245 -2252.

AMA Style

Meng Hwee Chia, Ashwin M. Khambadkone. Application of Matrix pencil method in sub-cycle voltage dip classification. 2013 IEEE Energy Conversion Congress and Exposition. 2013; ():2245-2252.

Chicago/Turabian Style

Meng Hwee Chia; Ashwin M. Khambadkone. 2013. "Application of Matrix pencil method in sub-cycle voltage dip classification." 2013 IEEE Energy Conversion Congress and Exposition , no. : 2245-2252.

Journal article
Published: 26 July 2013 in IEEE Transactions on Smart Grid
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Energy storage is needed in micro-grid to help solve the problem of intermittency introduced by renewable energy sources, enhance power quality and improve controllability of power flow. This paper presents an energy manager for energy storage system (ESS) in micro-grids. The objectives of the energy manager are focused on improving the energy efficiency and extending the life expectancy of ESS while ensuring constraints of energy storage modules are complied with. To this end a smart local prediction and local scheduling algorithm is proposed. A battery lifetime model that uses the proposed Peukert lifetime energy throughput based on the workload of the battery is developed. Verification shows that in the long run, the energy manger can improve overall energy efficiency of ESS from 74.1% to 85.5%, and improve estimated lifetime of 2 Battery Packs in ESS from 3.6 years and 2.4 years to 5 years and 5.7 years respectively.

ACS Style

Duong Tran; Ashwin Khambadkone. Energy Management for Lifetime Extension of Energy Storage System in Micro-Grid Applications. IEEE Transactions on Smart Grid 2013, 4, 1289 -1296.

AMA Style

Duong Tran, Ashwin Khambadkone. Energy Management for Lifetime Extension of Energy Storage System in Micro-Grid Applications. IEEE Transactions on Smart Grid. 2013; 4 (3):1289-1296.

Chicago/Turabian Style

Duong Tran; Ashwin Khambadkone. 2013. "Energy Management for Lifetime Extension of Energy Storage System in Micro-Grid Applications." IEEE Transactions on Smart Grid 4, no. 3: 1289-1296.

Conference paper
Published: 01 March 2013 in 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
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Power Electronics Building Block (PEBB) systems may experience different types of load transients, including short-circuit fault or scheduled load switching, which can lead to overloading stress and reliability issues. This paper uses cumulative current energy and dynamic electro-thermal model to analyze the over current capability of a PEBB system. The analysis can be used to choose protection devices and an improved operation strategy is presented in order to maximize the over current capability of the system. Some preliminary results are also shown to prove that, with the proposed strategy, the temperature profile of the devices can be fully utilized without triggering thermal breakdown and expanded operation duration can be achieved even under overload conditions in the PEBB system.

ACS Style

Huanhuan Wang; Ashwin M. Khambadkone. Investigation on over current capability in the Power Electronics Building Blocks System. 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC) 2013, 2493 -2497.

AMA Style

Huanhuan Wang, Ashwin M. Khambadkone. Investigation on over current capability in the Power Electronics Building Blocks System. 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC). 2013; ():2493-2497.

Chicago/Turabian Style

Huanhuan Wang; Ashwin M. Khambadkone. 2013. "Investigation on over current capability in the Power Electronics Building Blocks System." 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC) , no. : 2493-2497.

Proceedings article
Published: 01 September 2012 in 2012 IEEE Energy Conversion Congress and Exposition (ECCE)
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In this paper, to ensure stable operation of a wind power plant augmented with energy storage, dynamic control for energy storage system (ESS) inside the wind power plant is investigated. Control structure and control parameters of ESS are selected based on proposed small-signal stability criterion and large-signal stability criterion. Simulation result shows that with proposed dynamic control scheme for the ESS, the wind power power plant is stabilized when grid behaves as a constant power load which becomes a destabilizing factor, or when there is failure of wind turbine.

ACS Style

Duong Tran; Ashwin M Khambadkone. Dynamic control of energy storage system for stable operation of wind power plant. 2012 IEEE Energy Conversion Congress and Exposition (ECCE) 2012, 666 -671.

AMA Style

Duong Tran, Ashwin M Khambadkone. Dynamic control of energy storage system for stable operation of wind power plant. 2012 IEEE Energy Conversion Congress and Exposition (ECCE). 2012; ():666-671.

Chicago/Turabian Style

Duong Tran; Ashwin M Khambadkone. 2012. "Dynamic control of energy storage system for stable operation of wind power plant." 2012 IEEE Energy Conversion Congress and Exposition (ECCE) , no. : 666-671.

Conference paper
Published: 01 June 2012 in 2012 IEEE Congress on Evolutionary Computation
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Optimal selection and sizing of Distributed Energy Resources (DER) is an important research problem for the advancement of distributed power systems. This paper presents detail studies on optimal sizing of DER for integrated microgrids using Evolutionary Strategy (ES). Integrated microgrid is an innovative architecture in distributed power systems, in which several microgrids are interconnected with each other for superior control and management of the distributed power systems. Right coordination among DER in microgrids, and proper harmony among the microgrids and the main distribution grid are critical challenges. Types of DER and capacities of them are needed to optimize such that proposed integrated microgrid provides reliable supply of energy at cheap cost. In this research, the problem is formulated as a nonlinear mixed-integer minimization problem which minimizes capital and annual operational cost of DER subject to a variety of system and unit constraints. Evolutionary strategy was developed for solving the minimization problem. The proposed methodology was used to design integrated microgrids for A*Star IEDS (Intelligent Energy Distribution System) project. The design results have shown that the proposed methodology provides excellent convergence and feasible optimum solution.

ACS Style

T. Logenthiran; Dipti Srinivasan; Ashwin Khambadkone; T. Sundar Raj. Optimal sizing of Distributed Energy Resources for integrated microgrids using Evolutionary Strategy. 2012 IEEE Congress on Evolutionary Computation 2012, 1 -8.

AMA Style

T. Logenthiran, Dipti Srinivasan, Ashwin Khambadkone, T. Sundar Raj. Optimal sizing of Distributed Energy Resources for integrated microgrids using Evolutionary Strategy. 2012 IEEE Congress on Evolutionary Computation. 2012; ():1-8.

Chicago/Turabian Style

T. Logenthiran; Dipti Srinivasan; Ashwin Khambadkone; T. Sundar Raj. 2012. "Optimal sizing of Distributed Energy Resources for integrated microgrids using Evolutionary Strategy." 2012 IEEE Congress on Evolutionary Computation , no. : 1-8.

Journal article
Published: 09 April 2012 in IEEE Transactions on Smart Grid
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This paper presents a multiagent system (MAS) for real-time operation of a microgrid. The proposed operational strategy is mainly focused on generation scheduling and demand side management. In generation scheduling, schedule coordinator agent executes a two-stage scheduling: day-ahead and real-time scheduling. The day-ahead scheduling finds out hourly power settings of distributed energy resources (DERs) from a day-ahead energy market. The real-time scheduling updates the power settings of the distributed energy resources by considering the results of the day-ahead scheduling and feedback from real-time operation of the microgrid in real-time digital simulator (RTDS). A demand side management agent performs load shifting before the day-ahead scheduling, and does load curtailing in real-time whenever it is necessary and possible. The distributed multiagent model proposed in this paper provides a common communication interface for all components of the microgrid to interact with one another for autonomous intelligent control actions. Furthermore, the multiagent system maximizes the power production of local distributed generators, minimizes the operational cost of the microgrid, and optimizes the power exchange between the main power grid and the microgrid subject to system constraints and constraints of distributed energy resources. Outcome of simulation studies demonstrates the effectiveness of the proposed multiagent approach for real-time operation of a microgrid.

ACS Style

Thillainathan Logenthiran; Dipti Srinivasan; Ashwin Khambadkone; Htay Nwe Aung. Multiagent System for Real-Time Operation of a Microgrid in Real-Time Digital Simulator. IEEE Transactions on Smart Grid 2012, 3, 925 -933.

AMA Style

Thillainathan Logenthiran, Dipti Srinivasan, Ashwin Khambadkone, Htay Nwe Aung. Multiagent System for Real-Time Operation of a Microgrid in Real-Time Digital Simulator. IEEE Transactions on Smart Grid. 2012; 3 (2):925-933.

Chicago/Turabian Style

Thillainathan Logenthiran; Dipti Srinivasan; Ashwin Khambadkone; Htay Nwe Aung. 2012. "Multiagent System for Real-Time Operation of a Microgrid in Real-Time Digital Simulator." IEEE Transactions on Smart Grid 3, no. 2: 925-933.

Conference paper
Published: 01 February 2012 in 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
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Constant frequency controllers designed for continuous conduction mode (CCM) give poor efficiency and power factor at light load in power factor correctors (PFCs) of computer and server power supplies. With the increasing efficiency and power factor requirements at light load demanded by energy saving programs, a multimode digital control scheme that provides higher efficiency and power factor at light load without additional and costly external components is proposed. The CCM-DCM control of the multimode control scheme reduces RMS current drawn from the AC mains by ensuring good input current shaping in both CCM and discontinuous conduction mode (DCM), leading to higher efficiency and power factor at light load. It is computationally simple as compared to other CCM-DCM control schemes. The no load control of the multimode control scheme reduces constant losses at very light load by turning the PFC on and off to regulate the output voltage within a hysteresis band. Compared to other on-off control schemes, a small load jump is sufficient to exit the proposed no load control scheme, allowing a smooth transition between the no load control and the CCM-DCM active mode control.

ACS Style

Shu Fan Lim; Ashwin M Khambadkone. A multimode digital control scheme for boost PFC with higher efficiency and power factor at light load. 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC) 2012, 291 -298.

AMA Style

Shu Fan Lim, Ashwin M Khambadkone. A multimode digital control scheme for boost PFC with higher efficiency and power factor at light load. 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC). 2012; ():291-298.

Chicago/Turabian Style

Shu Fan Lim; Ashwin M Khambadkone. 2012. "A multimode digital control scheme for boost PFC with higher efficiency and power factor at light load." 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC) , no. : 291-298.