基于SVPWM脉宽调制原理的光伏并网逆变器的研究

Research on Photovoltaic Grid-connected Inverter Based on SVPWM Pulse Width Modulation Principle

基于LCL滤波器的三相逆变电路作为主电路的拓扑形式,对比讨论了SPWM与SVPWM两种调制方法,选择高频性能良好,对直流电压利用率较高的SVPWM调制技术,作为并网逆变器的调制方法.提出了一种基于PI控制、重复控制和电压前馈控制相结合的控制策略,以期使并网电能达到入网标准.

The three-phase inverter circuit based on LCL filter is used as the topology form of the main circuit. The two modulation methods of SPWM and SVPWM are discussed in comparison. The SVPWM modulation technology with good high-frequency performance and high DC voltage utilization is selected as the grid-connected inverse. The modulation method of the transformer. Finally, a control strategy based on PI control, repetitive control and voltage feedforward control is proposed in order to make the grid-connected power reach the network access standard.