并联逆变器下垂控制策略的改进

The Improved Method for Parallel Inverters Droop Control

针对并联逆变器提出了一种改进的下垂控制策略,该控制策略引入动态响应速度和稳态精度较好的比例谐振(PR)控制器来抑制电压波形畸变。同时引入虚拟阻抗以重新配置逆变器的输出阻抗,减少并联系统环流。实验表明改进的方法减少了并联系统的环流,提高了动态响应速度,并能适应线路阻抗存在差异的情况。

This article presents an improved droop method to control the power sharing of parallel inverter systems.A proportional-resonant controller with good transient response and steady-state accuracy is used to restrain the distor- tion, and a virtual complex impedance is also included to adjust the output impedance to minimize the circulating current.Compared to the traditional method,the improved controller offers good dynamic performance and is more adantive to different line imnedance situations.Simulatinn and exnarlmantal r^ltllg v^rlfv th~ imnr＇nv^mpnlg