A Reactive Power Control Method Based on Dynamic Virtual Impedance for PV Micro-grid

2022 4th Asia Energy and Electrical Engineering Symposium (AEEES) Pub Date : 2022-03-25 DOI:10.1109/AEEES54426.2022.9759737

Zipeng Zhou, Hao Zhao, Zhaohui He, Peihao Yang

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引用次数: 2

Abstract

In the AC microgrid system composed of photovoltaic, the inverter is connected to the large grid through the common connection point. Droop control is usually used to maintain the power balance and voltage stability of photovoltaic power supply point, and the voltage stability is realized by reactive power compensation. In the actual photovoltaic microgrid system, due to the transmission line impedance mismatch, there are errors in reactive power distribution. In order to solve this problem, this paper proposes a virtual impedance to improve the accuracy of reactive power distribution, specifically using dynamic virtual impedance to improve the resistance characteristics of the system and compensate for voltage drop. Aiming at the transient impact caused by the voltage surge caused by load removal in photovoltaic microgrid, the changes of active and reactive power are analyzed, and a reactive current control strategy is proposed to stabilize and consolidate the bus voltage. The above strategies are verified by Matlab/Simulink simulation and experiment to verify that the proposed scheme can effectively improve the control performance of photovoltaic microgrid.

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基于动态虚拟阻抗的光伏微电网无功控制方法

在由光伏组成的交流微网系统中，逆变器通过公共连接点与大电网相连。下垂控制通常用于维持光伏供电点的功率平衡和电压稳定，电压稳定通过无功补偿来实现。在实际的光伏微网系统中，由于传输线阻抗失配，存在无功分配误差。为了解决这一问题，本文提出了一种虚拟阻抗来提高无功分配的精度，具体来说就是利用动态虚拟阻抗来改善系统的电阻特性和补偿电压降。针对光伏微电网卸荷后电压浪涌造成的暂态冲击，分析了有功功率和无功功率的变化，提出了稳定巩固母线电压的无功电流控制策略。通过Matlab/Simulink仿真和实验验证了上述策略，验证了所提方案能够有效提高光伏微网的控制性能。

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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