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It is dedicated to the sustainable development on multi-disciplinary energy frameworks, providing reliable and optimal cutting-edge solutions to AC and DC microgrids, shipboard, offshore and maritime applications, space electric power systems, IoT-based energy systems among others. With more than 10 years of experience, CROM currently comprises world-class laboratories, having so far more than 100 members, including researchers, PhD students, and visiting scholars. As a major research center, CROM has established a close international cooperation with industry firms, universities, and research institutions. CENTER FOR RESEARCH ON MICROGRIDS CROM is a European leading research center, affiliated to the Department of Energy at Aalborg University. It is dedicated to the sustainable development on multi-disciplinary energy frameworks, providing reliable and optimal cutting-edge solutions to AC and DC microgrids, shipboard, offshore and maritime applications, space electric power systems, IoT-based energy systems among others. With more than 10 years of experience, CROM currently comprises world-class laboratories, having so far more than 100 members, including researchers, PhD students, and visiting scholars. As a major research center, CROM has established a close international cooperation with industry firms, universities, and research institutions. Introduction to CROM Research & Industrial Projects PhD/Industrial courses CROM Facilities CROM NEWS YAJUAN GUAN PRESENTS A TECH-IN PAPER AT PEDG 2023 11.06.2023 TECH-IN SECOND WORKSHOP 10.03.2023 MAJID ALI ATTENDED AND PRESENTED A TECH-IN PROJECT RELATED PAPER AT ICEPECC-2023 09.03.2023 YAJUAN GUAN PRESENTS A TECH-IN PAPER AT PEDG 2023 11.06.2023 TECH-IN SECOND WORKSHOP 10.03.2023 MAJID ALI ATTENDED AND PRESENTED A TECH-IN PROJECT RELATED PAPER AT ICEPECC-2023 09.03.2023 + Show more news LATEST PUBLICATIONS ACCURATE POWER SHARING FOR ISLANDED DC MICROGRIDS CONSIDERING MISMATCHED FEEDER RESISTANCES Accurate load power sharing and bus voltage regulation are two critical control objectives for ensuring power quality and reliable operation of DC microgrids. Although regulating the DC Bus voltage can be achieved by adopting an external secondary control loop, inaccurate load power/current sharing among converters is a prominent issue due to feeder resistances mismatch. This can lead to undesired overloading of converters, triggering over-current protection relays, and potentially resulting in cascading failure of the whole system. Existing literature uses virtual resistance techniques to improve the power sharing accuracy; however, so far, no explicit relation between the values of the virtual resistances and the feeder resistances mismatch has been formulated, opening the possibility to enhance power sharing even further. Therefore, this paper proposes an accurate power sharing strategy in which the virtual resistances are chosen to account for the feeder resistances mismatch. The proposed technique relies on the optimal tuning of the virtual resistance assigned to the local controller of each converter. An online estimation algorithm of the physical feeder resistances, required for virtual resistance tuning, is embedded into the control loop of each converter. Thus, prior information about the feeder resistances in the design stage is not required. The proposed approach is validated through simulation and experimental results from a Hardware-in-the-Loop setup of a typical islanded DC microgrid. The results demonstrate the approach merits, achieving accurate power sharing among converters and ensuring robust operation, even in scenarios involving communication failures. * Nabil Mohammed * Leonardo Callegaro * Mihai Ciobotaru * Josep M. Guerrero Journal article June 15, 2023 A COMPARATIVE STUDY OF SMART THD-BASED FAULT PROTECTION TECHNIQUES FOR DISTRIBUTION NETWORKS The integration of Distributed Generators (DGs) into distribution systems (DSs) leads to more reliable and efficient power delivery for customers. However, the possibility of bi-directional power flow creates new technical problems for protection schemes. This poses a threat to conventional strategies because the relay settings have to be adjusted depending on the network topology and operational mode. As a solution, it is important to develop novel fault protection techniques to ensure reliable protection and avoid unnecessary tripping. In this regard, Total Harmonic Distortion (THD) can be used as a key parameter for evaluating the grid’s waveform quality during fault events. This paper presents a comparison between two DS protection strategies that employ THD levels, estimated amplitude voltages, and zero-sequence components as instantaneous indicators during the faults that function as a kind of fault sensor to detect, identify, and isolate faults. The first method uses a Multiple Second Order Generalized Integrator (MSOGI) to obtain the estimated variables, whereas the second method uses a single SOGI for the same purpose (SOGI-THD). Both methods rely on communication lines between protective devices (PDs) to facilitate coordinated protection. The effectiveness of these methods is assessed by using simulations in MATLAB/Simulink considering various factors such as different types of faults and DG penetrations, different fault resistances and fault locations in the proposed network. Moreover, the performance of these methods is compared with conventional overcurrent and differential protections. The results show that the SOGI-THD method is highly effective in detecting and isolating faults with a time interval of 6–8.5 ms using only three SOGIs while requiring only 447 processor cycles for execution. In comparison to other protection methods, the SOGI-THD method exhibits a faster response time and a lower computational burden. Furthermore, the SOGI-THD method is robust to harmonic distortion, as it considers pre-existing harmonic content before the fault and avoids interference with the fault detection process. * Wael Al Hanaineh * Jose Matas * Josep M. Guerrero Journal article May 18, 2023 ACCURATE REACTIVE POWER SHARING STRATEGY FOR DROOP-BASED ISLANDED AC MICROGRIDS In islanded AC microgrids, the mismatched impedances of the interfacing feeders between the inverters and the load bus cause poor reactive power-sharing when the conventional frequency and voltage droop control technique is employed. Such operation endangers the whole microgrid reliability as it may lead to overloading certain inverters and, consequently, triggering protection relays and causing cascaded failure in the microgrid. Thus, this paper proposes an accurate reactive power sharing strategy that considers the mismatched feeder impedances in islanded AC microgrids. It is based on optimal tuning of the virtual complex impedance for each inverter. The proposed strategy has several advantages. it has a physical meaning as it establishes an explicit relationship between the mismatched values of the actual resistive-inductive feeders and the assigned values for the proposed optimal virtual complex impedance for each inverter. Third, there is no need for prior knowledge in the design stage about the actual feeder impedances as they are estimated online from the available measurements. Lastly, the proposed control is reliable and fault-tolerant which copes with sudden failure in some inverters and with the communication disruptions/delays as it ensures accurate reactive sharing even under the primary controller. Simulation and experimental verification results are presented to validate the performance of the proposed technique. * Nabil Mohammed * Mihai Ciobotaru * Abderezak Lashab * Josep M. Guerrero Journal article March 1, 2023 ACCURATE POWER SHARING FOR ISLANDED DC MICROGRIDS CONSIDERING MISMATCHED FEEDER RESISTANCES Accurate load power sharing and bus voltage regulation are two critical control objectives for ensuring power quality and reliable operation of DC microgrids. Although regulating the DC Bus voltage can be achieved by adopting an external secondary control loop, inaccurate load power/current sharing among converters is a prominent issue due to feeder resistances mismatch. This can lead to undesired overloading of converters, triggering over-current protection relays, and potentially resulting in cascading failure of the whole system. Existing literature uses virtual resistance techniques to improve the power sharing accuracy; however, so far, no explicit relation between the values of the virtual resistances and the feeder resistances mismatch has been formulated, opening the possibility to enhance power sharing even further. Therefore, this paper proposes an accurate power sharing strategy in which the virtual resistances are chosen to account for the feeder resistances mismatch. The proposed technique relies on the optimal tuning of the virtual resistance assigned to the local controller of each converter. An online estimation algorithm of the physical feeder resistances, required for virtual resistance tuning, is embedded into the control loop of each converter. Thus, prior information about the feeder resistances in the design stage is not required. The proposed approach is validated through simulation and experimental results from a Hardware-in-the-Loop setup of a typical islanded DC microgrid. The results demonstrate the approach merits, achieving accurate power sharing among converters and ensuring robust operation, even in scenarios involving communication failures. * Nabil Mohammed * Leonardo Callegaro * Mihai Ciobotaru * Josep M. Guerrero Journal article June 15, 2023 A COMPARATIVE STUDY OF SMART THD-BASED FAULT PROTECTION TECHNIQUES FOR DISTRIBUTION NETWORKS The integration of Distributed Generators (DGs) into distribution systems (DSs) leads to more reliable and efficient power delivery for customers. However, the possibility of bi-directional power flow creates new technical problems for protection schemes. This poses a threat to conventional strategies because the relay settings have to be adjusted depending on the network topology and operational mode. As a solution, it is important to develop novel fault protection techniques to ensure reliable protection and avoid unnecessary tripping. In this regard, Total Harmonic Distortion (THD) can be used as a key parameter for evaluating the grid’s waveform quality during fault events. This paper presents a comparison between two DS protection strategies that employ THD levels, estimated amplitude voltages, and zero-sequence components as instantaneous indicators during the faults that function as a kind of fault sensor to detect, identify, and isolate faults. The first method uses a Multiple Second Order Generalized Integrator (MSOGI) to obtain the estimated variables, whereas the second method uses a single SOGI for the same purpose (SOGI-THD). Both methods rely on communication lines between protective devices (PDs) to facilitate coordinated protection. The effectiveness of these methods is assessed by using simulations in MATLAB/Simulink considering various factors such as different types of faults and DG penetrations, different fault resistances and fault locations in the proposed network. Moreover, the performance of these methods is compared with conventional overcurrent and differential protections. The results show that the SOGI-THD method is highly effective in detecting and isolating faults with a time interval of 6–8.5 ms using only three SOGIs while requiring only 447 processor cycles for execution. In comparison to other protection methods, the SOGI-THD method exhibits a faster response time and a lower computational burden. Furthermore, the SOGI-THD method is robust to harmonic distortion, as it considers pre-existing harmonic content before the fault and avoids interference with the fault detection process. * Wael Al Hanaineh * Jose Matas * Josep M. Guerrero Journal article May 18, 2023 ACCURATE REACTIVE POWER SHARING STRATEGY FOR DROOP-BASED ISLANDED AC MICROGRIDS In islanded AC microgrids, the mismatched impedances of the interfacing feeders between the inverters and the load bus cause poor reactive power-sharing when the conventional frequency and voltage droop control technique is employed. Such operation endangers the whole microgrid reliability as it may lead to overloading certain inverters and, consequently, triggering protection relays and causing cascaded failure in the microgrid. Thus, this paper proposes an accurate reactive power sharing strategy that considers the mismatched feeder impedances in islanded AC microgrids. It is based on optimal tuning of the virtual complex impedance for each inverter. The proposed strategy has several advantages. it has a physical meaning as it establishes an explicit relationship between the mismatched values of the actual resistive-inductive feeders and the assigned values for the proposed optimal virtual complex impedance for each inverter. Third, there is no need for prior knowledge in the design stage about the actual feeder impedances as they are estimated online from the available measurements. Lastly, the proposed control is reliable and fault-tolerant which copes with sudden failure in some inverters and with the communication disruptions/delays as it ensures accurate reactive sharing even under the primary controller. Simulation and experimental verification results are presented to validate the performance of the proposed technique. * Nabil Mohammed * Mihai Ciobotaru * Abderezak Lashab * Josep M. Guerrero Journal article March 1, 2023 Read more This research group is aligned with the following UN Sustainable Development Goals. 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