中文摘要：

目前,电流滞环控制广泛用于光伏并网逆变器的电流控制,基于恒定环宽的滞环控制技术中开关频率大范围变化给逆变器带来的缺陷,以及根据变环宽滞环电流控制技术中滞环和开关频率的补偿能力的关系。采用模糊控制理论,利用参考电流和误差电流来实现滞环宽度可调的方法,使开关频率的变化范围大大减小,仿真实验结果表明可调滞环宽比恒定滞环宽的控制效果更好。

英文摘要：

Nowadays,the hysteresis current control is widely used in grid-connected PV inverter current control.Although a wide rang of frequency change brings the inverter some disadvantages,these disadvantages can be compensated by the hysteresis and switching frequency of variable-band hysteresis current control.Based on fuzzy control theory,this paper makes the change rang of switching frequency less and less through making use of the method which is characterized as utilizing reference current and current error to make the hysteresis extent more variable.The results of simulation experiment indicate that the variable-band hysteresis has better effect of control than fixed-band hysteresis.