并网逆变器的网压前馈准比例谐振控制方式研究

Research on Grid Voltage Feed-Forward and Quasi Proportional Resonant Control Scheme for Grid-Connected Inverter

准比例谐振控制具有对特定频率响应速度快、不存在耦合项且易实现特定谐波补偿等3个显著特点,并被应用于多种分布式发电系统中。针对实际电网电压的频率扰动和幅值畸变的特点,研究了网压前馈准比例谐振控制方式及其应用于并网逆变器的控制性能。仿真分析表明,与传统准比例谐振控制相比较,网压前馈准比例谐振控制可提高系统应对网压突变的能力,减少逆变器并网电流的谐波畸变率。

Quasi-proportional resonant controller has three significant features which are good harmonic compensation,fast response to specific frequency and no coupling term. Due to its three significant features the controller is widely used in many distributed generation systems. According to the actual power grid voltage disturbance frequency and amplitude distortion,this paper studied the grid voltage feed-forward quasi-proportional resonant control method and its application in grid inverter control performance. The simulation analysis shows that compared with the traditional quasi-proportional resonant controller,the grid voltage feed-forward quasi-proportional resonant control method can improve the ability to cope with the grid voltage mutation,reduce the rate of inverter grid current harmonic distortion.