基于准比例谐振积分与无差拍复合控制的光伏并网逆变控制方法研究

Research on photovoltaic grid connected inverter control method based on quasiproportional resonance integral and deadbeat compound control

光伏并网逆变器的控制方法是实现光伏系统并网控制的关键。在对比分析比例谐振控制器的基础上,提出准比例谐振积分与无差拍复合控制相结合的方法,并应用于三相光伏并网逆变系统中。在两相静止坐标系下,准比例谐振控制器(QPR)完成对基波电流的无静差跟踪,基于重复原理的无差拍控制器(DBC)抑制电网低次谐波的干扰,积分环节降低直流分量的影响。在Matlab/Simulink下的仿真结果表明,该控制方法可以实现对基波正弦量的无静差跟踪,有效抑制谐波,具有较好的动态和稳态性能。

The photovoltaic grid connected inverter control method is the key to realizing grid connected control of the pho-tovoltaic system.On the basis of comparing and analyzing the proportional resonant controller,the method of combining the quasi-proportional resonant integral with deadbeat compound control is proposed and applied to the three-phase photovoltaic grid con-nected inverter system.In the two-phase stationary coordinate system,the zero static error tracking of the fundamental current is completed by using the quasi-proportional resonant(QPR)controller,the interference of low-order harmonics is suppressed by using the deadbeat controller(DBC)based on the repetition principle,and the influence of the DC component is reduced in the integral link.The Matlab/Simulink simulation results show that the control method can realize zero static error tracking of the fun-damental sinusoidal quantity,effectively suppress harmonics,and has good dynamic and steady-state performances.