三相SPWM光伏逆变电路LC滤波器设计与仿真

Design and Simulation of LC Filter Used in Three-Phase SPWM PV Inverter

目前光伏并网逆变电路的控制普遍采用SPWM正弦脉宽调制法,由于采用该方法的电路输出电压中含有一定量的谐波,对负载的工作将带来不利影响,因此要设法消除谐波以满足负载的要求.本文在计及电源内阻和负载的情形下,从插入损耗入手,详细地分析了LC滤波网络的相关参数,并用归一化方法设计滤波器,最后利用MATLAB软件仿真,验证了所设计LC滤波器的有效性.

Recently, the sine pulse width modulation （SPWM） control technology has been widely used in power electronic system. However, the output voltage of the inverter contains some harmonic which will have a great influence on the load. In order to make the load work normally, we must consider how to eliminate harmonics. Considering the influ- ences of power source resistance and load resistance, this paper discusses the insertion loss of LC filter and analyzes the related parameters of LC filter in detail. At the same time, a filter is designed under the circumstance of normalization. Finally, the LC filter is simulated with MATLAB to verify its effectiveness.