并联型有源滤波器的直接功率模糊控制

Direct power fuzzy control of shunt APF

针对并联型有源滤波器提出一种直接功率模糊控制方法,解除了传统直接功率控制方法中滞环宽度对开关频率的限制,用于消除非线性负载产生的谐波及补偿无功功率。该方法基于瞬时功率理论分析计算瞬时功率,并将瞬时有功功率和无功功率与参考值的差值分别作为模糊控制变量送入模糊规则库,由模糊规则产生开关状态信号。该方法不使用传统开关表和功率滞环比较器,控制更加灵活有效。仿真结果表明,采用所提方法的并联型有源滤波器具有良好的动静态特性,直流侧电压控制具有快速准确性和鲁棒性,能够实现网侧电流正弦化和功率因数单位化,提高电能质量。

A method of direct power fuzzy control is proposed for shunt active power filter to eliminate the harmonics brought by nonlinear load and compensate the reactive power,removing the restriction of hysteresis bandwidth on switching-frequency in traditional direct power control. The instantaneous power are anafyzed and calculated based on the instantaneous power theory. The deviation of instantaneous active/ reactive power is used as the fuzzy logic control variable and sent to the fuzzy rule base and the switching state signal is generated by the fuzzy rules. Without power hysteresis comparators and conventional switching table,the proposed control method is more flexible and efficient. Simulative results show that,the controlled shunt active power filter has better static and dynamic performance and the DC-side voltage control has fast accuracy and robustness,resulting in the sinusoidal grid-side current with unity power factor.