微电网逆变器的改进型下垂控制策略

Abstract

本文通过对传统下垂控制算法的有功、无功分析，引入虚拟电感的电压电流双环控制策略，虚拟电感使逆变器等效输出阻抗成感性，从而通过调节感抗匹配程度提供功率均衡效果；提出一种多逆变器并联运行的改进型下垂控制算法，通过改进型下垂控制参数设置，减弱了阻抗对环流的影响。实验仿真结果表明，改进型多逆变器并联的微电网改进型下垂控制算法提高了多逆变器的并联运行性能，有效减小了多逆变器并联运行的环流问题，大大提高了多逆变器并联运行的无功均衡效果。 In this paper, through the analysis of active and reactive power of traditional droop control algorithm, the voltage and current double loop control strategy is introduced. The virtual inductor causes the equivalent output impedance of the inverter into emotional, to provide a power equalization effect by adjusting the impedance matching degree; an improved droop control algorithm is proposed for multi-inverter parallel operation, and the influence of impedance on the circulation is weakened by the droop control parameters setting. The simulation results show that the improved droop control algorithm of multi-inverters parallel operation in micro-grid improves the performance of multi-inverters parallel operation. The circulating current problem of multi-inverters parallel operation is effectively reduced, and the reactive power balance effect of multi inverters parallel operation is greatly improved.