逆变器并联控制技术研究

本文研究了无输出隔离变压器的逆变器并联系统环流特性及其并联控制实现。在确定双闭环控制逆变器闭环传递函数并了解其等效输出阻抗特性的基础上,建立了基于等效输出阻抗的并联系统模型分析其环流特性,并提出了一种新的基于有功功率和无功功率的逆变器并联控制方案,最后通过实验验证了逆变器并联控制方案的可行性。

Research on the Control Technology of Parallel Inverter System

This paper is mainly devoted to the analysis of circulating current's characteristics and the control technologies of parallel inverter system without output isolating transformers.Base on the inverter model,the expression of equivalent output impedance is deduced and the models based on equivalent output impedance for double close-loop controlled inverter and its parallel system are established.An improved parallel control strategy based on real and reactive power is presented,which including the reference voltage phase and amplitude adjusts,power calculation and output voltage synchronized in different inverter.The experimental results prove that the methods mentioned above have good performance on Redundant parallel system.