基于模糊控制变环宽光伏逆变器的研究

Photovoltaic Inverter Based on the Fuzzy Control Within Variable Width

在恒定环宽滞环电流的基础上,针对开关频率大范围变化,提出模糊控制变环宽的方法,来控制光伏并网逆变器,以此使开关频率下降.利用MATLAB进行仿真,搭建了可调滞环宽度模块,仿真结果表明:加入模糊控制后开关频率大范围下降,谐波失真小,逆变器输出波形稳定,达到了预期的控制效果.

Based the current of hysteresis loop at a constant wide, according to the switching frequency var- iation for a wide range, fuzzy control at the variable ring wide method was proposed to control the photo- voltaic grid inverter and decrease the switching frequency. According to the MATLAB simulation, the ad- justable hysteresis width module was built. The simulation results show that fuzzy control led to the de- cline of the switching frequency in a wide range. Due to the small harmonic distortion, the waves from in- verter output were stable and achieved the expected effect of control.