Transient Stability Analysis of Grid-forming Converter Based on Virtual Synchronous Generator

2022 Asian Conference on Frontiers of Power and Energy (ACFPE) Pub Date : 2022-10-01 DOI:10.1109/ACFPE56003.2022.9952270

Zhongming Xiang, Qiulong Ni, Zhenhua Li, Jianping Xu, Sixun Li, Zheren Zhang, Zheng Xu

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Abstract

In recent years, the proportion of grid-forming converters based on virtual synchronous generator (VSG) has gradually increased in power systems, but the transient synchronization stability after it is connected to the power grid lacks in-depth research. The transient synchronous stability mechanism of VSG is studied in this paper. The transient synchronous stability model of the VSG during grid voltage dropping faults is established. Based on the phase portrait curve method, the instability mechanism of the VSG and the influence of voltage variation on its transient synchronization stability are studied. According to the reactive power and voltage coupling effect, an enhancement measure is proposed to improve the transient synchronization stability by automatically changing the command value of output active power. Finally, through the electromagnetic transient simulation model built in PSCAD/EMTDC, the transient stability mechanism of the VSG grid-connected system and the availability of enhancement measures during grid faults are respectively studied.

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基于虚拟同步发电机的并网变流器暂态稳定性分析

近年来，基于虚拟同步发电机(VSG)的并网变流器在电力系统中的比例逐渐增加，但其并网后的暂态同步稳定性缺乏深入的研究。本文研究了VSG的暂态同步稳定机理。建立了电网降压故障时VSG暂态同步稳定模型。基于相位肖像曲线法，研究了VSG的失稳机理以及电压变化对其暂态同步稳定性的影响。根据无功功率和电压耦合效应，提出了一种通过自动改变输出有功功率指令值来提高暂态同步稳定性的增强措施。最后，通过在PSCAD/EMTDC中建立的电磁暂态仿真模型，分别研究了VSG并网系统的暂态稳定机理和电网故障时增强措施的有效性。

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 Asian Conference on Frontiers of Power and Energy (ACFPE)

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