一种用于12脉波整流器谐波抑制的交错并联变换器

12脉波整流系统存在输入电流谐波含量较高的问题,对此本文详细分析了系统交直流侧电流关系,明确了有源平衡电抗器(AIPR)原边环流抑制输入电流谐波的机理,设计了交错并联Boost PFC电路对AIPR原边电流进行调制,以降低系统交流侧输入电流谐波;同时将能量馈送至12脉波整流系统输出负载侧,以实现谐波能量的重新利用。利用Matlab/Simulink对所设计的系统进行了仿真验证,并在9 kW功率等级下进行了实验验证。结果表明,仅需加入系统容量2%左右的变换器,即可将输入电流THD降低至原来的1/3,验证了该方法在大功率场合谐波抑制的有效性。

A Interleaved Converter for the 12-pulse Rectifier Harmonic Suppression

To solve the problem of the 12-pulse rectifier system's large THD, this paper analyzed the relationship between AC and DC side current, discovered that the form of the AC side current harmonics energy, which was embodied at DC side. The interleaved Boost PFC converter was used at DC side to concentrate extract specific harmonic energy and was fed back to the 12-pulse rectifier system output side to re-use harmonic energy. Simulation was done with Matlab/Simulink, also a 9 kW prototype was designed. Results showed that exclusively 2% of the converter system capacity can significantly inhibit the input current harmonics, and its THD reduced to the 1/3 of the original. The results indicated that the system had good harmonic suppression for large power conditions.