Virtual Voltage Control of VSG for Over-Current Suppression Under Symmetrical and Asymmetrical Voltage Dips
Virtual Voltage Control of VSG for Over-Current Suppression Under Symmetrical and Asymmetrical Voltage Dips
复制标题
用于抑制对称和不对称电压暂降下过流的 VSG 虚拟电压控制
DOI：
10.1109/tie.2021.3125654
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发表时间：
2021
影响因子：
7.7
通讯作者：
Liu Kang-Zhi
中科院分区：
文献类型：
--
作者：
Koiwa Kenta;Inoo Koyo;Zanma Tadanao;Liu Kang-Zhi
本文提出了一种新颖的，易于实现的过流抑制控制的电压控制的虚拟同步发电机（VSG）。由于VSG由电压源逆变器（VSI）组成，因此易受电网电压干扰（例如电压骤降/恢复）的影响。在最坏的情况下，由电压干扰引起的过电流会损坏VSI。所提出的VSG控制不仅可以抑制对称电压跌落/恢复引起的过流，而且可以抑制非对称电压跌落/恢复引起的过流。关键思想是使用新的虚拟电网电压的VSG参考输出电压。建议的VSG控制不需要复杂的分析/调整的实施和没有额外的设备，如故障电流限制器。由于这些优点，可以在不增加成本和调谐工作的情况下抑制VSG中的过电流。通过仿真和实验验证了该方法的有效性。
This article proposes a novel and easily implementable overcurrent suppression control for voltage-controlled virtual synchronous generators (VSGs). The VSG is vulnerable to grid voltage disturbances, such as voltage dip/recovery, because it consists of voltage source inverters (VSIs). In the worst case, the overcurrent caused by the voltage disturbance damages the VSI. The proposed VSG control can suppress the overcurrent caused by not only symmetrical but also asymmetrical voltage dip/recovery. The key idea is to use novel virtual grid voltages for the VSG reference output voltage. The proposed VSG control requires no complicated analysis/tuning for the implementation and no additional equipment, such as a fault-current limiter. Because of these advantages, the overcurrent in the VSG can be suppressed without increasing the cost and the tuning effort. The effectiveness of the proposed method is verified through simulations and experiments.