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Dr. Helder Leite
University of Porto - Faculty of Engineering

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Research Keywords & Expertise

0 Power System Operation
0 Power System Analysis and Simulation
0 Renewable and Sustainable Energy
0 Distributed control and optimization
0 Power System Protection and Control

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Power System Protection and Control

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Short Biography

I am a Lecturer in the Power System Group at University of Porto after having successfully pursued my PhD degree in Electrical Engineering from the University of Manchester in 2004 and the Licenciate's degree in Electrical Engineering from University of Porto in 2000. My research focus lies in the areas of Power Systems, more specifically Power System Protection and Automation (e.g. IEC 61850, Smart Grid, Protection Testing, Automation, Control), Asset Management and Condition Monitoring, Distributed Energy Resources Integration and VSC based HVDC Projects and Recent Technological Developments. Details about my path to scientifically explore and contribute more knowledge in the field of Power Systems can be found in this website. www.fe.up.pt/~hleite

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Journal article
Published: 25 June 2021 in IEEE Access
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The High Voltage Direct Current (HVDC) is an emerging technology that transmits power over long distances and at a higher capacity than the traditional AC systems. Integration of HVDC into modern power networks requires vital modification to the Supervisory, Control and Data Acquisition (SCADA) system, particularly in power system applications. For instance, the state estimator toolbox is an essential software to estimate the network AC and DC systems states. However, the state estimator may fail due to severely corrupted data, a.k.a bad data; hence, an additional data treatment is needed. This paper presents a unified bad data detection block for Weighted Least Squares (WLS) state estimation algorithm. The bad data detection block works for hybrid Voltage Source Converter (VSC)-HVDC/AC transmission systems. It improves the traditional Largest Normalized Residual (LNR) method by integrating the Gaussian Mixture Model (GMM) algorithm. This method reduces the time needed for bad data detection, increases the algorithm robustness, and enhances estimation accuracy. The Cigre B4 network is used as a test case to validate this work on a hybrid VSC-HVDC/AC network. Also, grid load and generation data from the UK is used to construct the simulation measurements and the GMM model. Simulation results show that the modified GMM-LNR has considerably reduced the detection time and improved the WLS accuracy.

ACS Style

Motaz M. Ayiad; Helder Leite; Hugo Martins.. State Estimation for Hybrid VSC Based HVDC/AC: Unified Bad Data Detection integrated with Gaussian Mixture Model. IEEE Access 2021, 9, 1 -1.

AMA Style

Motaz M. Ayiad, Helder Leite, Hugo Martins.. State Estimation for Hybrid VSC Based HVDC/AC: Unified Bad Data Detection integrated with Gaussian Mixture Model. IEEE Access. 2021; 9 ():1-1.

Chicago/Turabian Style

Motaz M. Ayiad; Helder Leite; Hugo Martins.. 2021. "State Estimation for Hybrid VSC Based HVDC/AC: Unified Bad Data Detection integrated with Gaussian Mixture Model." IEEE Access 9, no. : 1-1.

Journal article
Published: 17 June 2021 in Energies
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Voltage source converters (VSCs) are self-commutated converters able to generate AC voltages with or without the support of an AC connecting grid. VSCs allow fast control of active and reactive powers in an independent way. VSCs also have black start capability. Their use in high-voltage direct current (HVDC) systems, comparative to the more mature current source converter (CSC)-based HVDC, offers faster active power flow control. In addition, VSCs provide flexible reactive power control, independent at each converter terminal. It is also useful when connecting DC sources to weak AC grids. Steady-state RMS analysis techniques are commonly used for early-stage analysis, for design purposes and for relaying. Sources interfaced through DC/AC or AC/DC/AC converters, opposite to conventional generators, are not well represented by electromotive forces (E) behind impedance models. A methodology to include voltage source converters (VSCs) in conventional RMS short-circuit analysis techniques is advanced in this work. It represents an iterative procedure inside general calculation techniques and can even be used by those with only basic power electronics knowledge. Results are compared to those of the commercial software package PSS®CAPE to demonstrate the validity of the proposed rmsVSC algorithm.

ACS Style

Carlos Teixeira; Helder Leite. Integration of Voltage Source Converters in Steady-State RMS Short-Circuit Analysis. Energies 2021, 14, 3610 .

AMA Style

Carlos Teixeira, Helder Leite. Integration of Voltage Source Converters in Steady-State RMS Short-Circuit Analysis. Energies. 2021; 14 (12):3610.

Chicago/Turabian Style

Carlos Teixeira; Helder Leite. 2021. "Integration of Voltage Source Converters in Steady-State RMS Short-Circuit Analysis." Energies 14, no. 12: 3610.

Journal article
Published: 19 February 2021 in Energies
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The communication infrastructure of the modern Supervisory, Control and Data Acquisition (SCADA) system continues to enlarge, as hybrid High Voltage Direct Current (HVDC)/Alternating Current (AC) networks emerge. A centralized SCADA faces challenges to meet the time requirements of the two different power networks topologies, such as employing the SCADA toolboxes for both grids. This paper presents the modern communication infrastructure and the time requirements of a centralized SCADA for hybrid HVDC/AC network. In addition, a case study of a complete cycle for a unified Weighted Least Squares (WLS) state estimation is tested on a hybrid HVDC/AC transmission network, based on Voltage Source Converter (VSC). The cycle estimates the elapsed times from the sensors up to the SCADA side, including the data acquisition and the WLS processing times. The case study is carried out on the Cigre B4 DC test case network with 43 virtual Remote Terminal Unit (RTU)s installed and 10 data concentrators, all connected through a fiber-based communication network. It is concluded that the time requirements can be fulfilled for a hybrid HVDC/AC network.

ACS Style

Motaz Ayiad; Emily Maggioli; Helder Leite; Hugo Martins. Communication Requirements for a Hybrid VSC Based HVDC/AC Transmission Networks State Estimation. Energies 2021, 14, 1087 .

AMA Style

Motaz Ayiad, Emily Maggioli, Helder Leite, Hugo Martins. Communication Requirements for a Hybrid VSC Based HVDC/AC Transmission Networks State Estimation. Energies. 2021; 14 (4):1087.

Chicago/Turabian Style

Motaz Ayiad; Emily Maggioli; Helder Leite; Hugo Martins. 2021. "Communication Requirements for a Hybrid VSC Based HVDC/AC Transmission Networks State Estimation." Energies 14, no. 4: 1087.

Journal article
Published: 20 September 2020 in Energies
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As the integration of High Voltage Direct Current (HVDC) systems on modern power networks continues to expand, challenges have appeared in different fields of the network architecture. In the Supervisory, Control and Data Acquisition (SCADA) field, software and toolboxes are expected to be modified to meet the new network characteristics. Therefore, this paper presents a unified Weighted Least Squares (WLS) state estimation algorithm suitable for hybrid HVDC/AC transmission systems, based on Voltage Source Converter (VSC). The mathematical formulas of the unified approach are derived for modelling the AC, DC and converter coupling components. The method couples the AC and DC sides of the converter through power and voltage constraints and measurement functions. Two hybrid power system test cases have been studied to validate this work, a 4-AC/4-DC/4-AC network and Cigre B4 DC test case network. Furthermore, comparison between the fully decentralized state estimation and the unified method is provided, which indicated an accuracy improvement and error reduction.

ACS Style

Motaz Ayiad; Helder Leite; Hugo Martins. State Estimation for Hybrid VSC Based HVDC/AC Transmission Networks. Energies 2020, 13, 4932 .

AMA Style

Motaz Ayiad, Helder Leite, Hugo Martins. State Estimation for Hybrid VSC Based HVDC/AC Transmission Networks. Energies. 2020; 13 (18):4932.

Chicago/Turabian Style

Motaz Ayiad; Helder Leite; Hugo Martins. 2020. "State Estimation for Hybrid VSC Based HVDC/AC Transmission Networks." Energies 13, no. 18: 4932.

Journal article
Published: 20 April 2020 in Sustainability
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The large number of small scale Distributed Energy Resources (DER) such as Electric Vehicles (EVs), rooftop photovoltaic installations and Battery Energy Storage Systems (BESS), installed along distribution networks, poses several challenges related to power quality, efficiency, and reliability. Concurrently, the connection of DER may provide substantial flexibility to the operation of distribution grids and market players such as aggregators. This paper proposes an optimization framework for the energy management and scheduling of operation for Low Voltage (LV) networks assuring both admissible voltage magnitudes and minimized line congestion and voltage unbalances. The proposed tool allows the utilization and coordination of On-Load Tap Changer (OLTC) distribution transformers, BESS, and flexibilities provided by DER. The methodology is framed with a multi-objective three phase unbalanced multi-period AC Optimal Power Flow (MACOPF) solved as a nonlinear optimization problem. The performance of the resulting control scheme is validated on a LV distribution network through multiple case scenarios with high microgeneration and EV integration. The usefulness of the proposed scheme is additionally demonstrated by deriving the most efficient placement and sizing BESS solution based on yearly synthetic load and generation data-set. A techno-economical analysis is also conducted to identify optimal coordination among assets and DER for several objectives.

ACS Style

Konstantinos Kotsalos; Ismael Miranda; Jose Luis Dominguez-Garcia; Helder Leite; Nuno Silva; Nikos Hatziargyriou. Exploiting OLTC and BESS Operation Coordinated with Active Network Management in LV Networks. Sustainability 2020, 12, 3332 .

AMA Style

Konstantinos Kotsalos, Ismael Miranda, Jose Luis Dominguez-Garcia, Helder Leite, Nuno Silva, Nikos Hatziargyriou. Exploiting OLTC and BESS Operation Coordinated with Active Network Management in LV Networks. Sustainability. 2020; 12 (8):3332.

Chicago/Turabian Style

Konstantinos Kotsalos; Ismael Miranda; Jose Luis Dominguez-Garcia; Helder Leite; Nuno Silva; Nikos Hatziargyriou. 2020. "Exploiting OLTC and BESS Operation Coordinated with Active Network Management in LV Networks." Sustainability 12, no. 8: 3332.

Conference paper
Published: 01 October 2019 in IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
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The last decade the continuous integration of Distributed Energy Resources (DER) along distribution networks, follows an uncoordinated fashion posing manifold technical challenges for the operation of the grid. However, DER could be actively incorporated in the operation of distribution networks providing certain flexibility. Such DER flexibility is generally associated with temporal shifting of energy (i.e. for consumption or injection). This work assesses the active management of multiple DER in a coordinated manner in Low Voltage (LV) distribution networks. The flexible use of DER is hereby regarded for the provision of support to the LV grid, mainly for voltage regulation and phase balancing, line congestions management as well as to ensure rated power for the transformer of the secondary substation. A control framework is proposed for the management of DER flexibilities, which relies on a three phase multi-period optimal power flow. A study based on a real -IEEE benchmark- LV distribution network is presented to demonstrate and quantify the importance of active management of DER such as battery storage system, electric vehicles (with vehicle to grid operation) and microgeneration.

ACS Style

Konstantinos Kotsalos; Jose Luis Dominguez-Garcia; Nikolaos Hatziargyriou; Ismael Miranda; Helder Leite; Nuno Silva. Coordinated Management of Distributed Energy Resources in Smart Microgrids. IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society 2019, 1, 4133 -4138.

AMA Style

Konstantinos Kotsalos, Jose Luis Dominguez-Garcia, Nikolaos Hatziargyriou, Ismael Miranda, Helder Leite, Nuno Silva. Coordinated Management of Distributed Energy Resources in Smart Microgrids. IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society. 2019; 1 ():4133-4138.

Chicago/Turabian Style

Konstantinos Kotsalos; Jose Luis Dominguez-Garcia; Nikolaos Hatziargyriou; Ismael Miranda; Helder Leite; Nuno Silva. 2019. "Coordinated Management of Distributed Energy Resources in Smart Microgrids." IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society 1, no. : 4133-4138.

Conference paper
Published: 01 October 2019 in IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
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The present paper is a review on the impact of HVDC networks and technology on existing HVAC Transmission system protection. The first goal is to provide an overview of the impact and interactions of HVDC technology (DC protection and VSC-HVDC) on connected AC transmission network protection system. The second is a list of the main challenges faced by AC protections, followed by an overview of some of the research open points from the study of the interactions.

ACS Style

Emily Maggioli; Motaz Ayiad; Helder Leite; Adriano Carvalho. Overview on the Impact, Interactions and Challenges faced by AC Transmission Protection Systems with HVDC Technology. IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society 2019, 1, 2221 -2226.

AMA Style

Emily Maggioli, Motaz Ayiad, Helder Leite, Adriano Carvalho. Overview on the Impact, Interactions and Challenges faced by AC Transmission Protection Systems with HVDC Technology. IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society. 2019; 1 ():2221-2226.

Chicago/Turabian Style

Emily Maggioli; Motaz Ayiad; Helder Leite; Adriano Carvalho. 2019. "Overview on the Impact, Interactions and Challenges faced by AC Transmission Protection Systems with HVDC Technology." IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society 1, no. : 2221-2226.

Conference paper
Published: 01 September 2019 in 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe)
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The development of energy storage systems and the transition to greener generation profiles, driven by global environmental concerns, have contributed to the transformation from traditional thermal generator–based microgrids to renewable energy–based systems. The main challenge of these solutions is to ensure flexibility, reliability and energy quality while providing ancillary services. This work presents the dynamic analysis of the behaviour of a microgrid (MG) integrating storage under different operational contexts and exposed to different fault scenarios. The proposed methodology allows to evaluate the contribution from Converter–Based Distributed Generation (CBDG) to fault currents in MGs, and the ability the system's protections have to suppress them. Moreover, it focuses on the dynamic response of the Battery Energy Storage System (BESS) to different Short–Circuit (SC) faults. A MATLAB/Simulink simulation is developed, in order to model the connection of the MG envisioned in the DEMOCRAT project to the Low Voltage (LV) and Medium Voltage (MV) grids and its operation in isolated mode.

ACS Style

Carlos Fernandes; Ismael Miranda; Helder Leite; Eduardo Rodrigues. Fault Analysis in a Microgrid Context: DEMOCRAT Project. 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) 2019, 1 -5.

AMA Style

Carlos Fernandes, Ismael Miranda, Helder Leite, Eduardo Rodrigues. Fault Analysis in a Microgrid Context: DEMOCRAT Project. 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe). 2019; ():1-5.

Chicago/Turabian Style

Carlos Fernandes; Ismael Miranda; Helder Leite; Eduardo Rodrigues. 2019. "Fault Analysis in a Microgrid Context: DEMOCRAT Project." 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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A clear opportunity exists for the integration of Battery Energy Storage Systems (BESS) in hybrid off-grid applications, i.e., isolated grids with renewable sources (e.g. photovoltaic, wind) and small-scale diesel generators. In these applications, renewable sources have the potential to reduce fossil fuels derivatives consumption and reduce Greenhouse Gases (GHG) emissions. BESS present the capability of maximizing the integration of renewable energy and, consequently, further offset the use of diesel-fired generating units. Therefore, this work advances an operating strategy for the day-ahead planning of the generation units in the microgrid based on the use of Key Performance Indicators (KPIs).

ACS Style

Luis Costa; Marta Ribeiro; Ismael Miranda; Helder Leite. Integrating Hybrid Off-grid Systems with Battery Storage: Key Performance Indicators. 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) 2019, 1 -5.

AMA Style

Luis Costa, Marta Ribeiro, Ismael Miranda, Helder Leite. Integrating Hybrid Off-grid Systems with Battery Storage: Key Performance Indicators. 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe). 2019; ():1-5.

Chicago/Turabian Style

Luis Costa; Marta Ribeiro; Ismael Miranda; Helder Leite. 2019. "Integrating Hybrid Off-grid Systems with Battery Storage: Key Performance Indicators." 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) , no. : 1-5.

Journal article
Published: 26 March 2019 in Energies
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In recent years, the installation of residential Distributed Energy Resources (DER) that produce (mainly rooftop photovoltaics usually bundled with battery system) or consume (electric heat pumps, controllable loads, electric vehicles) electric power is continuously increasing in Low Voltage (LV) distribution networks. Several technical challenges may arise through the massive integration of DER, which have to be addressed by the distribution grid operator. However, DER can provide certain degree of flexibility to the operation of distribution grids, which is generally performed with temporal shifting of energy to be consumed or injected. This work advances a horizon optimization control framework which aims to efficiently schedule the LV network’s operation in day-ahead scale coordinating multiple DER. The main objectives of the proposed control is to ensure secure LV grid operation in the sense of admissible voltage bounds and rated loading conditions for the secondary transformer. The proposed methodology leans on a multi-period three-phase Optimal Power Flow (OPF) addressed as a nonlinear optimization problem. The resulting horizon control scheme is validated within an LV distribution network through multiple case scenarios with high microgeneration and electric vehicle integration providing admissible voltage limits and avoiding unnecessary active power curtailments.

ACS Style

Konstantinos Kotsalos; Ismael Miranda; Nuno Silva; Helder Leite. A Horizon Optimization Control Framework for the Coordinated Operation of Multiple Distributed Energy Resources in Low Voltage Distribution Networks. Energies 2019, 12, 1182 .

AMA Style

Konstantinos Kotsalos, Ismael Miranda, Nuno Silva, Helder Leite. A Horizon Optimization Control Framework for the Coordinated Operation of Multiple Distributed Energy Resources in Low Voltage Distribution Networks. Energies. 2019; 12 (6):1182.

Chicago/Turabian Style

Konstantinos Kotsalos; Ismael Miranda; Nuno Silva; Helder Leite. 2019. "A Horizon Optimization Control Framework for the Coordinated Operation of Multiple Distributed Energy Resources in Low Voltage Distribution Networks." Energies 12, no. 6: 1182.

Journal article
Published: 17 July 2018 in International Journal of Electrical Power & Energy Systems
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This paper presents qualitative and quantitative analysis of the traveling waves induced by faults on direct current (DC) transmission lines of line-commutated converter high-voltage direct current (LCC HVDC) systems for detecting the wavefront arrival times using the boundary wavelet coefficients from real-time stationary wavelet transform (RT-SWT). The qualitative analysis takes into account the steady-state operation and the detection of the inception times of both first and second wavefronts at the converter stations. The behavior of the boundary wavelet coefficients in DC transmission lines is examined considering the effects of the main parameters that influence the detection of the traveling waves, such as mother wavelets, sampling frequency, DC transmission line terminations, electrical noises, as well as fault resistance and distance. An algorithm designed to run in real-time and able to minimize the factors that hamper the performance of traveling wave-based protection (TWP) methods is proposed to detect the first and second surge arrival times. Quantitative results are achieved based on the accuracy of one- and two-terminal fault location estimation methods, and indicate the proper operation of the presented algorithm.

ACS Style

Daniel Marques da Silva; Flavio Costa; Vladimiro Miranda; Helder Leite. Wavelet-based analysis and detection of traveling waves due to DC faults in LCC HVDC systems. International Journal of Electrical Power & Energy Systems 2018, 104, 291 -300.

AMA Style

Daniel Marques da Silva, Flavio Costa, Vladimiro Miranda, Helder Leite. Wavelet-based analysis and detection of traveling waves due to DC faults in LCC HVDC systems. International Journal of Electrical Power & Energy Systems. 2018; 104 ():291-300.

Chicago/Turabian Style

Daniel Marques da Silva; Flavio Costa; Vladimiro Miranda; Helder Leite. 2018. "Wavelet-based analysis and detection of traveling waves due to DC faults in LCC HVDC systems." International Journal of Electrical Power & Energy Systems 104, no. : 291-300.

Journal article
Published: 01 November 2017 in Electric Power Systems Research
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Voltage Source Converter (VSC) based High Voltage Direct Current (HVDC) can control voltage and power flow on ac transmission lines with the priority of reactive current support during the fault as suggested in the grid codes for HVDC connections. Furthermore, the fault current contribution from the converter is limited in magnitude and modified in the waveform in order to protect the power electronic devices during the fault, which on the other hand affects the apparent impedance seen by the distance relay. This paper addresses the challenges faced by the distance protection of transmission lines connected with VSC-HVDC system by performing a closed-loop test of a commercial distance relay using Real Time Digital Simulator (RTDS). The power system with VSC is modeled in detail under a more realistic scenario in RTDS so that the performance of the distance protection can be tested under near to actual field conditions. The responses of the commercial distance relay for balanced and unbalanced faults are analyzed. The oscillograph data of the voltage, current and protection bits recorded by the relay are extracted and compared with the simulation results.

ACS Style

Mohammad Meraj Alam; Helder Leite; Nuno Silva; Adriano Da Silva Carvalho. Performance evaluation of distance protection of transmission lines connected with VSC-HVDC system using closed-loop test in RTDS. Electric Power Systems Research 2017, 152, 168 -183.

AMA Style

Mohammad Meraj Alam, Helder Leite, Nuno Silva, Adriano Da Silva Carvalho. Performance evaluation of distance protection of transmission lines connected with VSC-HVDC system using closed-loop test in RTDS. Electric Power Systems Research. 2017; 152 ():168-183.

Chicago/Turabian Style

Mohammad Meraj Alam; Helder Leite; Nuno Silva; Adriano Da Silva Carvalho. 2017. "Performance evaluation of distance protection of transmission lines connected with VSC-HVDC system using closed-loop test in RTDS." Electric Power Systems Research 152, no. : 168-183.

Journal article
Published: 01 November 2017 in International Journal of Electrical Power & Energy Systems
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ACS Style

Mohammad Meraj Alam; Helder Leite; Jun Liang; Adriano Da Silva Carvalho. Effects of VSC based HVDC system on distance protection of transmission lines. International Journal of Electrical Power & Energy Systems 2017, 92, 245 -260.

AMA Style

Mohammad Meraj Alam, Helder Leite, Jun Liang, Adriano Da Silva Carvalho. Effects of VSC based HVDC system on distance protection of transmission lines. International Journal of Electrical Power & Energy Systems. 2017; 92 ():245-260.

Chicago/Turabian Style

Mohammad Meraj Alam; Helder Leite; Jun Liang; Adriano Da Silva Carvalho. 2017. "Effects of VSC based HVDC system on distance protection of transmission lines." International Journal of Electrical Power & Energy Systems 92, no. : 245-260.

Conference paper
Published: 01 October 2017 in CIRED - Open Access Proceedings Journal
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ACS Style

Eduardo Rodrigues; Ismael Miranda; Nuno Silva; Helder Leite.. Optimal recloser deployment to leverage self-healing: a techno-economic robustness assessment. CIRED - Open Access Proceedings Journal 2017, 2017, 2467 -2470.

AMA Style

Eduardo Rodrigues, Ismael Miranda, Nuno Silva, Helder Leite.. Optimal recloser deployment to leverage self-healing: a techno-economic robustness assessment. CIRED - Open Access Proceedings Journal. 2017; 2017 (1):2467-2470.

Chicago/Turabian Style

Eduardo Rodrigues; Ismael Miranda; Nuno Silva; Helder Leite.. 2017. "Optimal recloser deployment to leverage self-healing: a techno-economic robustness assessment." CIRED - Open Access Proceedings Journal 2017, no. 1: 2467-2470.

Journal article
Published: 01 October 2017 in Electric Power Systems Research
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ACS Style

Ataollah Mokhberdoran; Adriano Carvalho; Nuno Silva; Helder Leite; Antonio Carrapatoso. Design and implementation of fast current releasing DC circuit breaker. Electric Power Systems Research 2017, 151, 218 -232.

AMA Style

Ataollah Mokhberdoran, Adriano Carvalho, Nuno Silva, Helder Leite, Antonio Carrapatoso. Design and implementation of fast current releasing DC circuit breaker. Electric Power Systems Research. 2017; 151 ():218-232.

Chicago/Turabian Style

Ataollah Mokhberdoran; Adriano Carvalho; Nuno Silva; Helder Leite; Antonio Carrapatoso. 2017. "Design and implementation of fast current releasing DC circuit breaker." Electric Power Systems Research 151, no. : 218-232.

Journal article
Published: 23 June 2017 in IEEE Transactions on Industrial Electronics
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This paper proposes a new n-port hybrid dc circuit breaker for offshore multiterminal HVDC grid application. The n-port dc circuit breaker can substitute n - 1 hybrid dc circuit breakers at a dc bus with n - 1 adjacent dc transmission lines. The system-level behavior of the proposed multiport hybrid dc circuit breaker is similar to other hybrid dc circuit breakers. The operation principles of the proposed multiport dc circuit breaker are introduced, analyzed, and compared to the existing solution in this work. The components ratings are compared to the existing solution, and the functionality of the proposed device is verified by simulation.

ACS Style

Ataollah Mokhberdoran; Dirk Van Hertem; Nuno Silva; Helder Leite; Adriano Carvalho. Multiport Hybrid HVDC Circuit Breaker. IEEE Transactions on Industrial Electronics 2017, 65, 309 -320.

AMA Style

Ataollah Mokhberdoran, Dirk Van Hertem, Nuno Silva, Helder Leite, Adriano Carvalho. Multiport Hybrid HVDC Circuit Breaker. IEEE Transactions on Industrial Electronics. 2017; 65 (1):309-320.

Chicago/Turabian Style

Ataollah Mokhberdoran; Dirk Van Hertem; Nuno Silva; Helder Leite; Adriano Carvalho. 2017. "Multiport Hybrid HVDC Circuit Breaker." IEEE Transactions on Industrial Electronics 65, no. 1: 309-320.

Conference paper
Published: 01 June 2017 in 2017 IEEE Manchester PowerTech
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The increasing rating and improved performance of self-commutated semiconductor devices have made possible Voltage-Sourced Converter based High Voltage DC transmission system. VSC-based HVDC power transmission is then becoming a more efficient solution for long distance power transmission, especially for off-shore wind plants. One of the advantages of VSC-based HVDC transmission system is its ability to independently control active and reactive power flow at the AC systems to which it is connected. Both in normal operation or under disturbances in the AC transmission system, the VSC-based HVDC can add additional controllability to the AC system; So that, VSC-based HVDC transmission system can enhance power system stability by modulating their active and reactive power. However, this flexibility is likely to affect the protective relay operation of transmission lines, particularly step distance protective relay. Thus, this paper presents the influence of the different control methods of a VSC-based HVDC transmission system on a distance protective relay.

ACS Style

Carlos Coelho Teixeira; Helder Leite. The influence of a VSC based HVDC link on distance protection relay assessed by CAPE software. 2017 IEEE Manchester PowerTech 2017, 1 -4.

AMA Style

Carlos Coelho Teixeira, Helder Leite. The influence of a VSC based HVDC link on distance protection relay assessed by CAPE software. 2017 IEEE Manchester PowerTech. 2017; ():1-4.

Chicago/Turabian Style

Carlos Coelho Teixeira; Helder Leite. 2017. "The influence of a VSC based HVDC link on distance protection relay assessed by CAPE software." 2017 IEEE Manchester PowerTech , no. : 1-4.

Journal article
Published: 01 February 2017 in Electric Power Systems Research
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The complexity of DC side short circuit fault current interruption has been identified as a major drawback of realization of multi-terminal HVDC grids. Although application of superconducting fault current limiters (SFCLs) in protection of HVDC systems based on slow protective schemes has been studied in the literature, its application in meshed HVDC systems based on modern and fast protective schemes has not been investigated, yet. This paper scrutinizes the SFCL application in the meshed HVDC grids protected by the fast DC protective schemes and fast hybrid DC circuit breakers. The purpose of SFCL application is to reduce the current interruption requirement of the HVDC circuit breaker and size of its elements. This research analyzes the requirements of suitable SFCL considering the fault operation behaviors of local protective relays and the hybrid DC circuit breakers. The results show that the appropriated SFCL can reduce fault current peak, size of current limiting inductor and also fault identification time. The application of SFCL not only reduces the size of surge arrester in the hybrid DC circuit breaker, but also can significantly decrease the current stress on the hybrid DC circuit breaker.

ACS Style

Ataollah Mokhberdoran; Adriano Carvalho; Nuno Silva; Helder Leite; Antonio Carrapatoso. Application study of superconducting fault current limiters in meshed HVDC grids protected by fast protection relays. Electric Power Systems Research 2017, 143, 292 -302.

AMA Style

Ataollah Mokhberdoran, Adriano Carvalho, Nuno Silva, Helder Leite, Antonio Carrapatoso. Application study of superconducting fault current limiters in meshed HVDC grids protected by fast protection relays. Electric Power Systems Research. 2017; 143 ():292-302.

Chicago/Turabian Style

Ataollah Mokhberdoran; Adriano Carvalho; Nuno Silva; Helder Leite; Antonio Carrapatoso. 2017. "Application study of superconducting fault current limiters in meshed HVDC grids protected by fast protection relays." Electric Power Systems Research 143, no. : 292-302.

Journal article
Published: 12 October 2016 in Transactions on Environment and Electrical Engineering
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Protection issue is identified as the main drawback of emerging multi-terminal HVDC grids. Multi-terminal HVDC grid demands fast short circuit fault current interruption. Fast DC circuit breakers as a promising solution can be implemented as either bidirectional or unidirectional devices. In addition to less implementation cost, the unidirectional DC circuit breakers have less power losses as compared to the bidirectional devices. A protection strategy for multi-terminal HVDC grid based on unidirectional breaking devices is discussed and assessed in this paper. The performance of unidirectional protection strategy is examined under different fault scenarios in a fourterminal MMC-HVDC grid model. Furthermore, the impacts of unidirectional protection strategy on power converters and also current interruption and surge arrester ratings of the DC circuit breakers are discussed.

ACS Style

Ataollah Mokhberdoran; Nuno Silva; Helder Leite; Adriano Carvalho. Unidirectional Protection Strategy for Multi-terminal HVDC Grids. Transactions on Environment and Electrical Engineering 2016, 1, 58 .

AMA Style

Ataollah Mokhberdoran, Nuno Silva, Helder Leite, Adriano Carvalho. Unidirectional Protection Strategy for Multi-terminal HVDC Grids. Transactions on Environment and Electrical Engineering. 2016; 1 (4):58.

Chicago/Turabian Style

Ataollah Mokhberdoran; Nuno Silva; Helder Leite; Adriano Carvalho. 2016. "Unidirectional Protection Strategy for Multi-terminal HVDC Grids." Transactions on Environment and Electrical Engineering 1, no. 4: 58.

Conference paper
Published: 01 September 2016 in 2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC)
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Protection issue is identified as the main drawback of the emerging multi-terminal HVDC grids. Multi-terminal HVDC grids demand fast short-circuit fault current interruption. The fast DC circuit breakers as a promising solution can be implemented as either bidirectional or unidirectional devices. In additional to less implementation cost, the unidirectional DC circuit breakers have less power losses as compared to the bidirectional ones. A protection strategy for multi-terminal HVDC grids based on unidirectional breaking devices is discussed and assessed in this paper. The performance of unidirectional protection strategy is examined under different fault scenarios in a four-terminal MMC-HVDC grid model. Furthermore, the impacts of unidirectional protection strategy on the power converters and also the current interruption and surge arrester ratings of the DC circuit breakers are discussed.

ACS Style

Ataollah Mokhberdoran; Nuno Silva; Helder Leite; Adriano Carvalho. A directional protection strategy for multi-terminal VSC-HVDC grids. 2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC) 2016, 1 -6.

AMA Style

Ataollah Mokhberdoran, Nuno Silva, Helder Leite, Adriano Carvalho. A directional protection strategy for multi-terminal VSC-HVDC grids. 2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC). 2016; ():1-6.

Chicago/Turabian Style

Ataollah Mokhberdoran; Nuno Silva; Helder Leite; Adriano Carvalho. 2016. "A directional protection strategy for multi-terminal VSC-HVDC grids." 2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC) , no. : 1-6.