Article
Engineering, Electrical & Electronic
Nidhal Khefifi, Azeddine Houari, Mohamed Machmoum, Abdelhakim Saim, Malek Ghanes
Summary: This article proposes an advanced modular control strategy for distributed generation-based islanded MicroGrids, aiming at achieving robust performances and accurate load power sharing. The method is based on IDA-PBC, with system modeling using PCH formalism and enhanced decoupled droop control to ensure system stability and accurate power sharing.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Juan Astrada, Cristian De Angelo
Summary: A strategy for implementing output impedance in multi-loop inverters with a double virtual impedance loop has been proposed, which can independently establish DC output impedance while reducing computational cost. The strategy allows for appropriate distribution of load current among parallel inverters while meeting standard requirements.
ELECTRIC POWER SYSTEMS RESEARCH
(2022)
Article
Energy & Fuels
Jorge Pinto, Adriano Carvalho, Vitor Morais
Summary: This paper discusses the impact of local renewable energy sources and heavy loads on the stability of power distribution networks, proposing the concept of microgrids and exploring scenarios of island operation for stable power balancing and sharing in city grids. The research presents a local control solution validated through numerical and experimental results.
FRONTIERS IN ENERGY RESEARCH
(2021)
Article
Engineering, Electrical & Electronic
Pei Yong, Audun Botterud, Ning Zhang, Chongqing Kang
Summary: This letter proposes a novel framework for evaluating the capacity value of UPS storage, taking into account their operational characteristics. The framework can effectively evaluate the capacity contributions of distributed UPS storage facilities.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Yubo Song, Subham Sahoo, Yongheng Yang, Frede Blaabjerg
Summary: To improve the safety and reliability of power electronic systems, reliability-oriented power sharing is adopted in multi-converter systems to reduce maintenance costs. The droop gains of the converters are adjust based on the accumulated damage to the power devices. However, this approach does not always hold throughout the entire loading profile, leading to lower reliability. This brief generalizes the reliability-oriented power sharing by adjusting the active droop gains based on the nominal power, improving system-level reliability especially under fluctuating loads or operator commands.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Electrical & Electronic
Hyo-Jun Ryu, Jae-Sung Mo, Seung-Cheol Choi, Young-Doo Yoon
Summary: This article proposes a voltage control strategy to improve the disturbance rejection performance during the parallel operation of a multimodular uninterruptible power supply (UPS). The reason for the occurrence of a circulating current is analyzed, and a partial feedforward control technique is proposed to compensate for a portion of the load current. An additional feedforward control technique is also proposed to enhance the disturbance rejection performance. The effectiveness of the proposed control strategy is verified through experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Energy & Fuels
Mohamad Hnayno, Ali Chehade, Henryk Klaba, Hadrien Bauduin, Guillaume Polidori, Chadi Maalouf
Summary: This paper introduces a new liquid-cooling technology for uninterruptible power supply (UPS) units, combining an air-cooling system with an indirect water-cooling system. The experiments conducted on a 600 kW SOCOMEC UPS validated a 20 K temperature difference profile and demonstrated a thermal efficiency of 82.27% using a water flow rate of 13 l/min. The liquid-cooled UPS reduced the total annual energy consumption of the cooling system by at least 85% compared with an air-cooled UPS.
Article
Automation & Control Systems
Jinghang Lu, Mehdi Savaghebi, Bingfu Zhang, Xiaochao Hou, Yao Sun, Josep M. Guerrero
Summary: This article proposes a distributed dynamic event-triggered control method to address the issue of mismatched line resistance in modular online uninterruptible power supply systems and achieve accurate active power and harmonic power sharing. The method adaptsively regulates virtual resistance, reduces communication among neighboring units, and ensures system stability.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Energy & Fuels
Mohd Aquib, A. S. Vijay, Suryanarayana Doolla, Mukul C. Chandorkar
Summary: This paper proposes an impedance based model reference adaptive system (Z-MRAS) scheme for power sharing in islanded microgrids. By estimating the impedance angle between distributed generators (DGs), the proposed scheme aims to enhance the proportional apparent power sharing between DGs in islanded mode.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2022)
Article
Engineering, Electrical & Electronic
Pei Yong, Ning Zhang, Yaowang Li, Qingchun Hou, Yuxiao Liu, Song Ci, Chongqing Kang
Summary: This paper proposes a novel analytical availability index calculation framework for evaluating power supply adequacy, taking into account the capacity and characteristics of UPS devices, as well as distribution network configuration and protection device placement.
IEEE TRANSACTIONS ON SMART GRID
(2022)
Review
Energy & Fuels
Syed Rizvi, Ahmed Abu-Siada
Summary: This paper provides a comprehensive examination of various techniques for sharing active power between multiple dispatchable generation sources distributed within an interconnected microgrid. The paper presents a concise comparison of most of the proposed systems published in the literature, and evaluates the benefits and restrictions of the proposed methods under various operating scenarios.
Article
Engineering, Electrical & Electronic
Tsai-Fu Wu, Yen-Hsiang Huang, Sakavov Temir, Ching-Chih Chan
Summary: This article presents a three-phase four-wire hybrid frequency parallel uninterruptable power supply (HbFPUPS) that uses ripple compensation to reduce output voltage distortion and improve dynamic response. The HbFPUPS consists of a low-frequency high-power uninterruptible power supply (LFUPS) and a high-frequency low-power uninterruptable power supply (HFUPS) connected in parallel. By controlling and designing parameters, the system effectively reduces voltage distortion and ripple, and improves stability and dynamic response.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Jiahui Jiang, Saeed Peyghami, Colin Coates, Frede Blaabjerg
Summary: This article proposes a decentralized power sharing approach to restrict thermal damage of converter components and avoid over-stressing converters, thus improving overall system performance and reliability. By appropriately sharing active and reactive power among different sources without using communication systems, the proposed decentralized strategy effectively controls power and energy flow. Simulations and numerical analysis demonstrate the effectiveness of this approach in enhancing the overall reliability of the MG.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Chemistry, Analytical
Po Li, Xiaoshan Tong, Zhoujing Wang, Maoguang Xu, Jianfeng Zhu
Summary: This paper proposes a load current sensorless finite control set model predictive control (FCS-MPC) scheme for a single-phase UPS inverter, which utilizes a time varying observer to accurately estimate individual components in the periodic load current signal without complex calculations. Compared with two typical sensorless methods, the proposed observer-based FCS-MPC strategy achieves smaller load current estimation error and lower output voltage distortion under both linear and nonlinear loads. The theoretical analysis is validated through simulation and experimental results, confirming the effectiveness of the system with a single-phase inverter rapid control prototype (RCP) set up using the Speedgoat real-time target machine.
Article
Engineering, Electrical & Electronic
Nima Amouzegar Ashtiani, Ali Sheykhi, S. Ali Khajehoddin
Summary: This article proposes an improved droop strategy to optimize the efficiency of parallel inverters. The strategy selects an optimal number of inverters based on their efficiency curve to process fractions of the power demand, and introduces an online inverter detection method to deal with light load situations. Experimental results demonstrate that this method can significantly improve system efficiency and enhance system reliability under light load conditions.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Pu Zhao, Yu Zhang, Qingxin Guan, Josep M. Guerrero
Summary: This article presents a method to reduce the current stress in the discontinuous conduction mode (DCM) by introducing trapezium conduction mode (TPCM) and zero-voltage switching. It also proposes a charge quantity model (CQM) applicable to any inverter topology and conduction mode, and a direct charge control method working at a fixed switching frequency. Simulation and experimental results verify the excellent steady-state and dynamic control performance of the proposed model and method.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Xiaoqiang Guo, Senyu Du, He Xing, Lichong Wang, Josep M. Guerrero
Summary: Leakage current is a significant problem in non-isolated inverters, particularly in medium- and high-voltage systems. This research proposes a new modulation method to reduce the common-mode voltage (CMV) and leakage current in a three-phase modular multilevel converter (MMC). The experimental results from MATLAB/Simulink and the hardware-in-loop platform demonstrate the effectiveness of the proposed scheme in suppressing leakage current and balancing parasitic capacitor voltage.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Yuancan Xu, Yandong Chen, Wenhua Wu, Shuhan Liao, Zili Wang, An Luo, Saddam Aziz, Josep M. Guerrero
Summary: Precise modeling and stability assessment of an asymmetric grid-following converter (GFC)-based ac system are complex due to the multifrequency coupling effect (m-FCE). Traditional small-signal modeling methods and order-reduction methods can effectively characterize m-FCE but have difficulty in revealing the physical implications and generation mechanism of coupling components. This article proposes an accurate complex circuit modeling framework that considers the impacts of amplitude and phase dynamics and finds that phase dynamics enhance m-FCE through positive feedback loops.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Energy & Fuels
Areeb Khalid, Syed Abdul Rahman Kashif, Noor Ul Ain, Muhammad Awais, Majid Ali Smieee, Jorge El Mariachet Carreno, Juan C. C. Vasquez, Josep M. M. Guerrero, Baseem Khan
Summary: Lithium-ion batteries have become increasingly important for portable devices and vehicles, and accurately estimating their state of charge is crucial. This research paper explores the use of probabilistic filter algorithms, such as the extended Kalman filter and sigma point Kalman filter, for SOC estimation, and compares their performance. The sigma point Kalman filter is found to have an advantage over the extended Kalman filter in state estimation, making it a potential alternative for battery management systems in electric vehicles. However, implementing these filters may require more sophisticated microcontrollers due to increased computational complexity.
Article
Energy & Fuels
Haiyan Zhang, Yufei Teng, Josep M. Guerrero, Pierluigi Siano, Xiaorong Sun
Summary: This study proposes a two-layer interdependent network model to investigate failure propagation in network systems. Each subnetwork adopts the Susceptible-Infected-Susceptible (SIS) epidemic-spreading model. Based on this, a failure cooperation propagation model of network systems is constructed, and a node protection mechanism is introduced to ensure the normal operation of key nodes. Simulation using a scale-free cyber network and IEEE118-bus power system is performed to analyze the influence of the coupling effect between them on the final failure scale.
Article
Engineering, Electrical & Electronic
Ioan Viorel Banu, Fadila Barkat, Marcel Istrate, Josep M. Guerrero, George Culea, Petru Livinti, Justina G. Motas, Bogdan Neagu, Dragos Andrioaia
Summary: This paper presents a new passive anti-islanding protection for three-phase grid-connected photovoltaic power systems with minimal switching losses. The proposed strategy integrates five conventional passive relays, including over/under current, over/under voltage, over/under frequency, rate of change of frequency, and dc-link voltage-based methods, to reduce limitations and combine the strengths of each method in islanding detection. The performance in islanding prevention is determined by the detection time of islanding operation mode. The proposed anti-islanding protection was simulated under complete disconnection of the photovoltaic inverter from the electrical power system and grid faults as required by new grid codes.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Bo Long, XingYu Li, Jose Rodriguez, Josep M. Guerrero, Kil To Chong
Summary: In this study, a novel fractional-order model predictive controller (FOMPC) is proposed for a fractional-order virtual synchronous generator controller (FOVSG) to alleviate the output power oscillation and achieve an optimal frequency and voltage regulation for an islanded microgrid. Hardware-in-the-loop (HIL) experiments were carried out to demonstrate the superiority of FOMPC-FOVSG over existing VSG techniques under several scenarios.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Chemistry, Analytical
Wael Al Hanaineh, Jose Matas, Josep M. Guerrero
Summary: The integration of Distributed Generators (DGs) into distribution systems (DSs) provides more reliable and efficient power delivery. However, it also brings new technical problems for protection schemes. This paper compares two DS protection strategies that employ THD levels, estimated amplitude voltages, and zero-sequence components to detect, identify, and isolate faults. The results show that the SOGI-THD method is highly effective in fault detection and isolation with a faster response time and lower computational burden compared to traditional methods.
Article
Engineering, Electrical & Electronic
Nelson L. Diaz, Francesc Guinjoan, Guillermo Velasco-Quesada, Adriana C. Luna, Josep M. Guerrero
Summary: This paper proposes a cooperative strategy for the flexible integration of stand-alone AC microgrids using an intermediate multiterminal DC link based on voltage source converters. The strategy manages cooperative power exchange between microgrids through a knowledge-based fuzzy inference system that relies on the current operating conditions of the microgrids. The effectiveness and expandability of the proposed cooperative energy exchange strategy for enhancing the overall operation of multiple integrated microgrids have been fully verified by simulation and experimental validation.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Luona Xu, Jose Matas, Baoze Wei, Yun Yu, Yongjie Luo, Juan C. Vasquez, Josep M. Guerrero
Summary: Pulsed power load (PPL) is a special load type in shipboard microgrids (SMGs), which requires high transient power transfer with fast dynamics and strong robustness. This paper presents an improved pulsed power supply (PPS) control method using a nonlinear sliding mode control (SMC) method to achieve fast voltage regulation and robust pulse power tracking. The PPS system configuration, coordination principle, SMC controllers, and sizing of passive elements are analyzed in detail. Simulation results verify the effectiveness of the presented PPS.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Energy & Fuels
Majid Ali, Mohsin Riaz, Mohsin Ali Koondhar, Muhammad Sarfraz Akram, Josep M. Guerrero, Juan C. Vasquez, Baseem Khan
Summary: Rural electrification is crucial in Pakistan due to frequent power outages. This paper proposes a hybrid microgrid system using solar photovoltaic and wind energy for rural electrification. Simulation results show the system can produce a 230V sinusoidal output voltage.
ENERGY SCIENCE & ENGINEERING
(2023)
Article
Energy & Fuels
Bilal Naji Alhasnawi, Basil H. Jasim, Vladimir Bures, Bishoy E. Sedhom, Arshad Naji Alhasnawi, Rabeh Abbassi, Majid Razaq Mohamed Alsemawai, Pierluigi Siano, Josep M. Guerrero
Summary: This study proposes a coordinated smart building energy-sharing concept, aiming to reduce the total power cost of smart building users in a neighborhood by increasing the use of locally produced renewable energy.
ENERGY STRATEGY REVIEWS
(2023)
Article
Computer Science, Information Systems
Binod Sharma, Prabhat Kumar Pankaj, Yacine Terriche, Abdelhakim Saim, Ashish Shrestha, Chun-Lien Su, Josep M. Guerrero
Summary: This paper proposes an enhanced droop control method to improve power-sharing and maintain the distributed generators' terminal voltages and system frequency under balanced and unbalanced loads. The proposed control scheme includes a droop controller, inner current and voltage controller, and virtual impedance loop, and utilizes three-level neutral point clamped (NPC) inverters to compensate for unbalance. Simulation and lab-based experiments validate the effectiveness of the proposed control method in reducing voltage unbalance factors, decreasing negative sequence reactive powers, and maintaining system frequency within permissible limits.
Article
Energy & Fuels
Wenyuan Cao, Minxiao Han, Xiangkun Meng, Wenqiang Xie, Zmarrak Wali Khan, Josep M. Guerrero, Gibran David Agundis Tinajero
Summary: This paper proposes a simple but effective strategy based on the reverse droop method to address the AC voltage and frequency offsets in hybrid AC/DC distribution networks during the transfer process of operational modes. By introducing the reverse droop control, the IFC output power is adaptively tracked to the rated load power, suppressing the AC voltage offset and frequency offset. In addition, a universal parameter design method is discussed based on the stability limitations of the control system and the voltage quality requirements of AC critical loads. The simulation and experimental results validate the proposed control strategy and parameter design method.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2023)
Review
Engineering, Electrical & Electronic
Abdelfattah A. Eladl, Samaa Fawzy, Elhossaini E. Abd-Raboh, Akram Elmitwally, Gibran Agundis-Tinajero, Josep M. Guerrero, Mohamed A. Hassan
Summary: Most countries are increasingly exploiting renewable energy resources, particularly wind power, for economic and environmental reasons. However, the high penetration of wind energy in modern electrical networks raises issues such as frequency variation, voltage instability, and transmission capacity limitations. To address these problems, strategies such as spilling wind power or adding dispatchable generation and storage systems have been proposed. This paper provides a comprehensive literature review on the issue of wind power spillage (WPS) and discusses state-of-the-art solutions to minimize WPS while ensuring power system stability and security. The paper also explores real-world applications, challenges, and future trends in the field of WPS research.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
