基于广义二阶积分的新型单相逆变并网系统锁相环

A New PLL Structure of Single-phase Inverter Based on Second-order Generalized Integrator

针对现有的单相逆变器的输出相位与锁相环计算的数字相位存在偏差,对基于二阶广义积分器的锁相环加以改进,构造一种新型的相位闭环控制结构,将电网电压和逆变器输出的电压或电流锁相。仿真和样机试验结果表明:该方法消除了变压器、滤波器等环节带来的相位偏差,能够实现单位功率因数并网发电。

There is a phase deviation between the output voltage of inverter and digital phase calculated by PLL. This paper improved the existing PLL based on second-order generalized integrator, and constructed a new phase closed-loop control structure, keeping the grid voltage and the inverter output voltage or current synchronization. Simulation and prototype test results showed that this method eliminated the deviation caused by transformers, filters, etc. It also could aehieve unity power factor running.