Voltage and Frequency Suppression of Intentional Islanding Restoration Process for Distribution System with Multi-Generations

doi:10.16183/j.cnki.jsjtu.2021.418

Abstract

Abstract:

Intentional islanding restoration of distribution systems with multi-generations is of great importance to ensure the power supply of critical loads under extreme conditions, which is beneficial to improve the reliability of distribution systems. There are transient voltage and frequency fluctuations in the process of intentional islanding restoration, when the loads and distributed generations are gradually connected to the grid. The safety and stability of the intentional islanding are affected by the fluctuations, and networking process may fail in serious cases. Hence, the rapid power response of the energy storage system is utilized to suppress voltage and frequency fluctuations. A fluctuation suppression model based on energy storage system control is established, where a voltage and current double-loop feed-forward disturbance compensation control system is designed. A vector control method for energy storage system with improved dual-loop control is proposed, which solves the problems of traditional V/f control voltage offset and excessive voltage fluctuation. MATLAB/Simulink is used to build simulation models in different control modes in accordance with the black-start principle. The simulation results show that the improved double-loop control based on the vector method has a stronger anti-interference ability and significantly improved the islanding black-start self-organizing networking process. Voltage and frequency fluctuations are reduced, and the dynamic response performance of the system is improved.

Key words: distribution system with multi-generations, intentional islanding restoration, ad hoc network, fluctuation suppression, improved dual-loop control

CLC Number:

TM464

CHEN Chun, GAO Jing, CAO Yijia, WANG Weiyu, ZHAO Long. Voltage and Frequency Suppression of Intentional Islanding Restoration Process for Distribution System with Multi-Generations[J]. Journal of Shanghai Jiao Tong University, 2022, 56(5): 543-553.

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电源序号	电源类型	电源容量/ (kV·A)	初始参数
DG1	储能	40	电压680 V、荷电状态70%
DG2	永磁风力发电机	40	风速6 m/s
DG3	储能	40	电压680 V、荷电状态70%
DG4	光伏	20	光照强度1200 W/m²