采用移相电抗器的多相整流系统

Multi-phase rectifying system using phase-shifting reactor

针对电网中谐波污染日趋严重的问题,介绍了一种采用移相电抗器取代移相变压器、通过移相抑制谐波的方法,该方法不仅可获得与移相变压器相同的移相效果,而且由于移相电抗器与主电路采用串联方式,所需的绕组匝数很少,使得移相电抗器的体积、质量和成本都远小于移相变压器.以12相整流电路为例,给出了具有移相电抗器的多相整流系统的数学模型和仿真方法,阐述了移相角的选取和移相绕组的连接方式.对采用移相电抗器的12相整流系统进行了仿真和实验研究,并与3相整流系统作了比较.仿真和实验结果的电流频谱分析表明,采用移相电抗器的多相整流系统对于电源侧的电流谐波有显著的抑制效果,验证了所提出的带有移相电抗器的多相整流系统数学模型与仿真方法的正确性,证明了该方法在多相整流系统中应用的可行性.

Aiming at the harmonics pollution problem of power network, a new phase-shifting method for elimination of harmonics using phase-shifting reactor instead of phase-shifting transformer was introduced. Compared with the phase-shifting transformer, the phase-shifting reactor has much smaller size and lower cost due to much less turns of the windings. With taking the 12-phase rectifying circuit as an example, the mathematic model and simulation method for a multi-phase rectifying system with phase-shifting reactors were given, and the selection of phase-shifting angles and connecting manner of phase-shifting windings were described. The simulation and experimental study on a 12-phase rectifying system with phase-shifting reactor were carried out and compared with a 3-phase rectifying system. The current spectra analysis based on the simulation and tested results show that the multi-phase rectifying system with phase-shifting reactor can effectively restrain the current harmonics on the AC power supply side. The validation of mathematic model and simulation method for the multi-phase rectifying system with phase-shifting reactor, and the feasibility of using phase-shifting reactor instead of phase-shifting transformer in the multi-phase rectifying system get proved by both simulating and experimental results.