消谐控制逆变器的输出滤波参数分析及设计

Output Filter Parameter Analysis and Design of Harmonic Elimination Control Inverters

为使消谐PWM控制逆变器具有较好的正弦输出波形 ,针对消谐控制逆变器无低阶谐波的特点 ,采用了二阶L -C低通滤波网络 .理论分析和计算表明 ,该低通滤波器的接入将增大逆变电路的容量要求 ,滤波器参数的变化将对逆变器的电流及电压输出产生较大的影响 .同时还提出了滤波器的设计与参数计算方法 ,发现在尽可能减小逆变器输出电流负担和增加逆变器电压利用系数的前提下 ,合理地选择滤波参数 。

To make the harmonic elimination PWM-control inverter be of a good sine wave output, by taking the converter characteristic of none low-harmonic into consideration, the two-stage low-pass L-C filtration network was used to the inverter circuit. The theoretical analyses and calculated results indicate that the low-pass filter will increase the capacity demand of the inverter circuit, and the parameter variation of the filter will strongly affect the output current and output voltage of the inverter. Furthermore, the design and parameter calculation method of the filter were proposed. It is revealed that, when the output current stress decreases and the utilization coefficient increases as efficiently as possible, the correct selection of filter parameters can optimize the output performance of the inverter.