基于载波频率优化的级联型APF源性谐波能量不均抑制方法

发布时间：2018-08-18 08:33

【摘要】：基于载波移相(CPS)调制的H桥级联型(CHB)有源电力滤波器(APF)是中高压系统谐波治理的有效手段。分析并指出了级联型拓扑在输出谐波电流时存在的源性谐波能量不均问题。当输出的谐波电流频率与单元输出电压中某一开关谐波频率一致时,将产生功率耦合,导致单元直流电容电压发散。针对性地提出了一种载波频率优化方法:通过引入载波频率偏移量,实现了单元输出电压开关谐波与APF输出谐波电流的功率解耦;讨论了不同的载波偏移量对电容电压波动的影响,并给出了最优频率偏移量计算方法。对比了载波频率优化方法和传统载波轮换方法抑制源性谐波能量不均的效果,体现了载波频率优化方法的优越性。仿真和现场应用证明了所提方法能够有效地防止直流侧电压的发散并将波动抑制在最小值。
[Abstract]:H-bridge cascaded (CHB) active power filter (APF) based on carrier phase-shifted (CPS) modulation is an effective method for harmonic control in medium and high voltage systems. This paper analyzes and points out the problem that the harmonic energy of the cascaded topology is uneven when the harmonic current is outputted. When the output harmonic current frequency is the same as a switching harmonic frequency in the unit output voltage, the power coupling will occur, resulting in the unit DC capacitor voltage divergence. A carrier frequency optimization method is proposed. By introducing carrier frequency offset, the power decoupling of unit output voltage switch harmonics and APF output harmonic current is realized. The influence of different carrier offset on capacitance voltage fluctuation is discussed, and the calculation method of optimal frequency offset is given. Compared with the traditional carrier frequency optimization method and the traditional carrier rotation method to suppress the harmonic energy imbalance, the superiority of the carrier frequency optimization method is demonstrated. The simulation and field application show that the proposed method can effectively prevent the DC side voltage from diverging and restrain the fluctuation to the minimum.
【作者单位】：武汉大学电气工程学院;
【基金】：国家自然科学基金(51277137)~~
【分类号】：TM761

【参考文献】