用新型LC滤波器抑制设备中谐波的研究

非线性设备是电网的谐波污染源，本文把非线性设备分为电流型谐波源和电压型谐波源，说明了无源滤波器对不同谐波源的抑制机理。为了抑制电压型谐波源，利用电感与电容的并联谐振原理，采用变压器和交流电容设计了新的谐波抑制装置——新型LC并联谐振型滤波器。建立了滤波器的阻抗模型，分析了各参数对滤波器阻抗的影响。该方法可大大提高无源滤波器的经济实用性。最后，通过实验证明了该方法在谐波抑制方面的有效性。

Research on New LC Filter in Harmonic Suppression of Equipment

Electric network is polluted by nonlinear equipments.The paper relevantly classifies nonlinear equipments into current type and voltage type harmonic sources and explains suppression mechanisms of different harmonic sources with passive filter.For suppressing the voltage harmonic source,a new harmonic suppression device with transformer and AC capacitor is designed,based on the theory of shunt-resonance of inductance and capacitance.Then impedance model of the filter is built and influence of parameters on the filter is analyzed respectively.The device is an advance in the passive filter field for improving economical efficiency and practicability greatly. At last,the effectiveness of the approach is demonstrated experimentally.