基于PR控制的电流控制型逆变器研究

为了克服采用比例谐振（PR）控制的并网逆变器对电网非基频处干扰信号的抑制能力较弱的缺点,提出了一种电压前馈谐波补偿策略,即将电网中存在的3、5、7等高次谐波反馈到逆变器的控制端.通过对并网逆变器系统的理论分析建立了逆变系统的数学模型和Simulink仿真模型,对系统运行过程进行了仿真研究.仿真结果表明,采用电压前馈谐波补偿策略的逆变并网系统能够实现输出对参考无静差跟踪的要求,有效地减小电网中的干扰,使得输出中的总谐波畸变度（THD）由3.61%降低到0.31%,可应用于并网逆变器设计中.

Research on Current-Controlled Inverter With PR Control

In order to overcome the flaws that the grid inverter which adopts the PR（proportion-resonant） control has weak suppression on the interference signal at the non-fundamental frequency in the power grid,this paper presents a strategy of voltage feed-forward harmonic compensation,namely,to have a feedback of the 3rd,5th,7th and other high-order harmonics in the grid to the inverter control point,then,sets up a math model and the Simulink simulation model of the inverter by analyzing theoretically the grid inverter system,and finally simulates the system operational process.Simulation results show that the grid inverter system with voltage feed-forward harmonic compensation can fulfill the requirements for the output tracking with zero steady-state error to the reference,stand up to the interference effectively in the grid,and make the output THD from 3.61% to 0.31%,which can be available for the design of the grid inverter.