基于自适应虚拟阻抗的分布式无功功率分配控制策略

Analysis of Distributed Reactive Power Allocation Control Strategy Based on Adaptive Virtual Impedance

阐述分布式电源因线路阻抗不匹配,传统下垂控制方法难以实现并联微源输出无功率的合理分配。为此,提出一种基于自适应虚拟阻抗方法和动态一致性算法的新的控制策略,以确保在线路阻抗失配的情况下更好地分配无功功率。使用动态一致性算法来估计和调整虚拟阻抗(VI)的值,将获得的VI添加到总阻抗中,以计算主下垂控制器的新参考电压。这种控制方法不但改进了无功功率共享,而且不需要中央控制器或线路阻抗值。

This paper describes that due to mismatched line impedance,traditional droop control methods are difficult to achieve reasonable allocation of output power from parallel micro sources in distributed power sources.It proposes a new control strategy based on adaptive virtual impedance method and dynamic consistency algorithm to ensure better allocation of reactive power in the event of line impedance mismatch.It uses dynamic consistency algorithm to estimate and adjust the value of virtual impedance(VI),adding the obtained VI to the total impedance to calculate the new reference voltage of the main droop controller.This control method not only improves reactive power sharing,but also does not require a central controller or line impedance value.