基于PWM逆变器的LC滤波器

LC filter based on PWM inverter

为了使脉宽调制(PWM)逆变器具有较好的输出波形,针对PWM逆变器谐波次数较高的特点,采用二阶LC低通滤波网络。从逆变器无功容量最小的角度,介绍了一种单相电压型PWM逆变器LC滤波器的设计方法,该方法综合考虑了滤波器的频率特性、功率因数等要素,根据该方法选择LC参数,可以优化滤波器性能。

The orders of the harmonics of PWM inverter＇s output voltage are very high . Two orders LC lower-pass filter net was used to get better sinusoidal output waveform. A designed approach of filter for single-phase vohage-source PWM inverter based on the minimum reactive capacity of filter was proposed. This approach considers multi-element such as frequency characteristic ,power factor,etc. The performance of the filter would be optimized if the parameters of LC are choosed by the approach presented.