An Improved Control Strategy of Virtual Synchronous Generator under Unbalanced Conditions

Fen Li, Guihua Liu, Kai Zhu, Wei Wang
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引用次数: 7

Abstract

Virtual synchronous generators (VSG) have the potential to solve the stability problems caused by large-scale grid-connected of distributed generation (DG). However, traditional VSG control will lead to current unbalance and power oscillations under unbalanced conditions. Aiming at these problems, an improved comprehensive control strategy of VSG is proposed based on the traditional VSG control method with voltage and current inner loops. By analyzing the relationship among unbalanced current, power oscillation and negative sequence current, the reference currents under different control targets are obtained. On this basis, the comprehensive control of power fluctuation and current quality is realized by the idea of weighted control. Moreover, the proposed control strategy does not change the voltage source properties of VSG, providing voltage and frequency support for the system, and improving the ability of VSG with unbalanced load under islanded conditions. Simulation results verify the effectiveness of the proposed control strategy.
不平衡条件下虚拟同步发电机的改进控制策略
虚拟同步发电机(VSG)具有解决分布式发电(DG)大规模并网所带来的稳定性问题的潜力。然而,传统的VSG控制会导致电流不平衡和不平衡状态下的功率振荡。针对这些问题,在传统电压电流内环VSG控制方法的基础上,提出了一种改进的VSG综合控制策略。通过分析不平衡电流、功率振荡和负序电流之间的关系,得到了不同控制目标下的参考电流。在此基础上,采用加权控制思想实现了对功率波动和电流质量的综合控制。此外,所提出的控制策略不改变VSG的电压源特性,为系统提供电压和频率支持,提高了VSG在孤岛条件下负载不平衡的能力。仿真结果验证了所提控制策略的有效性。
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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