为了更好地解决分布式电源并网引起的高频谐波污染问题，本文在详细分析SPWM调制型逆变器开关过程产生的谐波电压的基础上，设计了一种适于滤除此类谐波电压的新型滤波器——双谐振滤波器。与常用的LCL滤波器相比，双谐振滤波器有良好的高频谐波衰减特性，对电感的需求少，大大降低了滤波器的成本和体积。最后给出了双谐振滤波器的实现方法及参数设计原则。PSCAD仿真结果验证了双谐振滤波器的可行性和有效性。%In order to solve the high frequency harmonic pollution problem caused by the grid-connected inverter, the harmonic voltage distribution under the switch process of grid-connected inverter are calculated and analyzed. On the base of which a novel double resonance filter for filtering the switching harmonic voltage is proposed. Compared with the existing LCL filter, the new one has better high frequency harmonic attenuation characteristics with less total inductance, which reduces the cost and volume of the filter. The parameter design principle and implementation method are introduced as well. Finally, the effectiveness and feasibility are verified by simulation results with PSCAD.
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