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在基于基波磁通补偿的串联混合型有源电力滤波器(APF)中,由脉宽调制逆变器实现了一个受控基波电流源。串联变压器一次侧的系统电源与系统阻抗、无源滤波器和非线性负载共同作用,使串联变压器二次侧端口呈现一个谐波干扰电压,导致逆变器输出电流中含有一定谐波,影响了滤波器的滤波效果。文中以脉宽调制逆变器为核心,建立了滤波器的数学模型,并对其滤波特性进行了分析。提出了改善其滤波效果的3项有效措施,即适当增大逆变器输出滤波电感、合理选择串联变压器原副方变比、采用电压前馈控制技术。设计了一套基于数字控制的10kVAAPF样机,实验结果证明了原理分析的正确性。
In a series hybrid active power filter (APF) based on fundamental magnetic flux compensation, a controlled fundamental current source is implemented by a pulse width modulated inverter. The system power of the primary side of the series transformer and the system impedance, the passive filter and the non-linear load act together to present a harmonic interference voltage on the secondary port of the series transformer, resulting in a certain harmonic in the inverter output current, affecting Filter the filter effect. In this paper, the pulse width modulation inverter as the core, established the mathematical model of the filter, and its filtering characteristics were analyzed. Three effective measures to improve its filtering effect are put forward, that is, the output filter inductance of the inverter is appropriately increased, the original auxiliary ratio of the series transformer is reasonably selected, and the voltage feedforward control technique is adopted. A 10kVAAPF prototype based on digital control was designed. The experimental results proved the correctness of the principle analysis.