【摘要】 三相四线制有源电力滤波器(APF)可以补偿非线性负载产生的各次谐波、三相不平衡电流、零序电流及无功电流。提出一种新型谐波电流检测法,可以检测三相四线制系统各次谐波的正、负、零序分量及无功分量。提出一种同时检测负载电流和电源电流的前馈加反馈控制策略,检测负载电流进行前馈控制,检测电源电流进行反馈控制,既保证了谐波补偿效果又具有良好的动态性能,可以用于快速变化的非线性负载的谐波补偿。由于各次谐波分量在其相应的同步旋转坐标系下为直流量,反馈控制采用多个同步旋转坐标系下的积分控制,可以实现几乎100%补偿各次谐波分量。仿真和实验结果验证了理论分析的正确性。更多还原

【Abstract】 The three-phase four-wire APF(Active Power Filter) can be used to compensate the harmonics,three-phase unbalance current,zero sequence current and reactive current caused by the nonlinear loads. A novel method is proposed to detect the positive,negative and zero sequence components and the reactive power component of the harmonics in three-phase four-wire system. A feedforward-feedback control strategy is proposed,which simultaneously detects the load current for feedforward control and the source current for feedback control. It ensures the harmonic compensation effect and the better dynamic performance,suitable for the harmonic compensation of rapidly varying nonlinear loads. Since the harmonic component of each order is a DC variable in the corresponding synchronous rotating coordinates system,multiple integral regulators in the synchronous rotating coordinates system are applied in the feedback control to realize the nearly 100 % harmonic compensation for different orders. Simulative and experimental results prove the correctness of theoretical analysis.更多还原