Evaluation and Improvement of Voltage Stability of the Paralleled Virtual Synchronous Generator and Current-Controlled VSC System

2022 4th Asia Energy and Electrical Engineering Symposium (AEEES) Pub Date : 2022-03-25 DOI:10.1109/AEEES54426.2022.9759812

Huiqiang Sun, Xinchun Lin, Songbai Chen, Dan Liu, P. Xiong, Yiqun Kang

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Abstract

With the booming of renewables, power electronic converters have been increasingly connected to the power grid. However, when the power grid fails, the connection with the power grid should be quickly disconnected and switched to the island operation mode for improving the reliability of the power supply. The islanded system has more complicated issues with stable operation and power supply reliability. Aiming at the voltage stability problem of the islanded system, this paper firstly establishes a small-signal model of the islanded system in parallel with virtual synchronous generator (VSG) and current-controlled voltage source converter (CCS). The voltage stability of the system is evaluated and the stability boundary of the system is predicted, which guides further parameter optimization. Then the multi-objective particle swarm optimization algorithm is introduced to optimize the key controller parameters which have a great impact on the system voltage. Finally, the simulation results are given to verify the correctness of the theoretical analysis.

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虚拟同步发电机与电流控制VSC并联系统电压稳定性评估与改进

随着可再生能源的蓬勃发展，电力电子变流器越来越多地接入电网。但当电网发生故障时，应迅速断开与电网的连接，并切换到孤岛运行模式，以提高供电的可靠性。孤岛系统的稳定运行和供电可靠性问题更为复杂。针对孤岛系统的电压稳定性问题，首先建立了并联虚拟同步发电机(VSG)和电流控制电压源变换器(CCS)的孤岛系统的小信号模型。评估了系统的电压稳定性，并预测了系统的稳定边界，为进一步的参数优化提供了指导。然后引入多目标粒子群优化算法对影响系统电压的关键控制器参数进行优化。最后给出了仿真结果，验证了理论分析的正确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2022 4th Asia Energy and Electrical Engineering Symposium (AEEES)

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