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提出了一种基于不对称级联多电平逆变器(ACMI)的串联混合有源电力滤波器(SHAPF)及其控制策略。其中,ACMI的各单元逆变器的输出额定电压呈3的幂次方增长,N个单元逆变器的级联可以输出3N电平的阶梯波电压。该SHAPF的串联有源部分被控制为一个幅值由负荷电压基波有效值偏差确定、相位与线路终端电压基波正序分量相同的基波正弦电流源,用同一个装置和同一套控制策略可以实现电源电压扰动(包括谐波、电压降落和不对称等)隔离、负荷谐波电流补偿、负荷节点电压基波幅值调整、线路终端功率因数调整和故障电流限制等功能。与传统SHAPF相比,该SHAPF具有功能多、控制简单、补偿效果好以及其串联有源部分开关损耗小和易于实现大容量化等优点。数学推导和仿真分析验证了该SHAPF及其控制策略的正确性和有效性。
A hybrid active power filter (SHAPF) based on asymmetric cascaded multilevel inverter (ACMI) and its control strategy are proposed. Among them, each unit of ACMI inverter rated output power increased by a power of 3, N unit inverter cascade can output 3N level step voltage. The series active part of the SHAPF is controlled as a fundamental sinusoidal current source whose fundamental amplitude is determined by the RMS deviation of the fundamental voltage of the load voltage and whose phase is the same as that of the fundamental wave fundamental of the line terminal voltage. The same set of control strategies Power supply voltage disturbance (including harmonic, voltage drop and asymmetry, etc.) isolation, load harmonic current compensation, load node voltage fundamental amplitude adjustment, the line terminal power factor adjustment and fault current limit and other functions. Compared with the traditional SHAPF, the SHAPF has the advantages of multiple functions, simple control, good compensation effect, small switching loss of the active part in the series, high capacity and easy realization. Mathematical derivation and simulation analysis verify the correctness and validity of the SHAPF and its control strategy.