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由于中性线参与了实际的控制,使得三相四线有源电力滤波器(APF)电流检测与控制更为复杂,同时APF直流侧电压的稳定控制也更为困难。为有效地检测四桥臂三相四线APF的参考补偿电流以满足实现对APF的有效控制并对各类非线性负载电流实施实时补偿,在分析了四桥臂三相四线APF工作原理的基础上,采用Takagi-Sugeno(T-S)模糊控制的方法,以直流侧电压的三值输入逻辑规则对四桥臂三相四线APF进行建模,利用并行分布补偿算法获得模糊控制律,在此基础上设计了模糊控制器,实时准确地获得四桥臂三相四线APF在各种非线性负载条件下的补偿参考电流并使直流侧电压得到自动稳定控制。仿真及实验结果验证了该控制策略的正确性及有效性。
As the neutral line is involved in the actual control, the current detection and control of APF is more complicated, and it is more difficult to control the steady-state voltage of APF DC side. In order to effectively detect reference compensation current of four-leg three-phase four-wire APF in order to achieve effective control of APF and real-time compensation for various non-linear load currents, the paper analyzes the working principle of four-leg three-phase four- Based on the Takagi-Sugeno (TS) fuzzy control method, the three-legged four-leg APF model is modeled by the three-input logic rule of DC voltage and the fuzzy control law is obtained by parallel distributed compensation algorithm. Based on the design of the fuzzy controller, real-time and accurate access to four-leg three-phase four-wire APF under various non-linear load compensation reference current and the DC side voltage is automatically stable control. Simulation and experimental results verify the correctness and effectiveness of the control strategy.