移相电抗器对变流器供电系统谐波抑制的机理研究

STUDY ON HARMONIC REPRESSION OF CONVERTER-FED POWER SYSTEM BY USING PHASE-SHIFTING REACTOR

大容量的交流器供电系统减少向电网注入谐波的主要方法是采用多相整流电路和交流器的多重化技术,一般需要采用多绕组移相变压器进行电路移相。该文提出了一种用移相电抗器取代移相变压器的电路拓扑结构,可大大降低移相电路的成本。该文分析了移相电抗器的谐波抑制机理,介绍了移相电抗器的结构、最佳移相角的选取、移相绕组连接方式及移相绕组匝数的确定等。对具有移相电抗器的六相整流系统进行了基于SIMULINK的数字仿真和实验研究,并与未采用移相方式的三相全波整流电路进行了对比分析。仿真与实验结果的电流频谱分析表明,采用移相电抗器的六相整流电路对于电源侧的5、7、11和13次电流谐波有较好的抑制效果。

The circuit topology of a phase-shifting reactor is presented .The structure of the phase-shifting reactor ,the choice of the optimal phase-shifting angle.the determination of turns and the connection mode of the phase-shifting windings etc.are described based on the analysis of the narmonics repression principle.The digital simulation and experimental study of a 6-phase rectifying circuit with the phase-shifting reactor are conducted.reduce effectively The 5.7.11and 13thhanmonic components of the current on the power supply side are effectirely reduced by a 6-phase rectification circuit with the phase-shifting reactor in comparison with a 3-phase fullwave rectifisation circuit without the phase-shiftingreactor.