Secondary-Frequency and Voltage-Regulation Control of Multi-Parallel Inverter Microgrid System

Jiawei Dong, Chunyang Gong, Jun Bao, Lihua Zhu, Yuanjun Hou and Zhixin Wang ()
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Jiawei Dong: School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Chunyang Gong: College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Jun Bao: Shanghai Xilong Technology Co., Ltd., Shanghai 201109, China
Lihua Zhu: Shanghai Chint Power Systems Co., Ltd., Shanghai 201614, China
Yuanjun Hou: Shanghai Da Yu Informational Tech Co., Ltd., Shanghai 200000, China
Zhixin Wang: School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Energies, 2022, vol. 15, issue 22, 1-25

Abstract: As an important form of distributed renewable energy utilization and consumption, the multi-parallel inverter microgrid system works in both an isolated and grid-connected operation mode. Secondary-frequency and voltage-regulation control are very important in solving problems that appears in these systems, such as the distributed secondary-frequency regulation real-time scheme, voltage and reactive power balancing, and the secondary-frequency regulation control under the disturbances and unbalanced conditions of a microgrid system. This paper introduces key technologies related to these issues, such as the consensus algorithm and event-triggered technique, the dynamic and adaptive virtual impedance technique, and the robust and self-anti-disturbance control technique. Research and design methods such as small-signal state-space analysis, the Lyapunov function design method, the impedance analysis method, ? -synthesis design, and the LMI matrix design method are adopted to solve the issues in secondary-frequency regulation and voltage regulation. As the number of inverters increases, the structure of the microgrid becomes more and more complex. Suggestions and prospects for future research are provided to realize control with low-communication technology and a distributed scheme. Finally, for the case study, the droop-control model and primary frequency/voltage deviation of a multi-parallel inverter microgrid system is analyzed, and a state-space model of a multi-parallel inverter microgrid system with a droop-control loop is established. Then, the quantitative relationship between the primary frequency/voltage deviation and the active and reactive power output in the system is discussed. The methods and problems of centralized and decentralized secondary-frequency regulation methods, secondary-frequency regulation methods based on a consensus algorithm and an event-triggered mechanism, reactive power and voltage equalization, power distribution, and small-signal stability of the multiple parallel inverter microgrid system regarding the virtual impedance loop are analyzed.

Keywords: multi-parallel inverter microgrid; secondary frequency and voltage regulation; consensus algorithm; event-triggered mechanism; virtual impedance; robust design (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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