一种改进的QPR并网逆变器控制策略

An Improved Quasi Proportional Resonant Control Strategy of Grid Connected Inventers

针对传统准比例谐振(QPR)控制策略不能在电网电压畸变条件下有效抑制并网电流谐波的缺点,设计了一种改进的QPR电流控制器.以三相并网逆变器为研究对象,在αβ静止坐标系下建立了三相并网逆变系统的数学模型和Simulink仿真模型,揭示了传统QPR控制在电网电压畸变时对并网电流质量影响的机理,分析了改进的QPR电流控制器的优越性.仿真结果表明,改进的QPR控制策略对比传统的QPR控制具备更强的抗干扰能力,在电网电压畸变时,能有效抑制并网电流的谐波畸变.

Traditional quasi proportional resonant（QPR）control strategy can not effectively suppress the grid current harmonic when the grid voltage distortion,so an improved QPR current controller was designed.Using three-phase grid inverter as the research object,the mathematical model and Simulink simulation model of three-phase grid connected inverter system are established in theαβcoordinate system.The mechanisms of voltage distortion affecting grid current when the grid voltage distortion were revealed.The advantage of the improved current controller was analyzed.The simulation show that the improved QPR control strategy has a strong anti-jamming capability compared to traditional control and can effectively suppress the grid current harmonic distortion under distorted grid voltage.