CAJ | 학술논문

针对风力发电机在直接并网方式下产生的暂态冲击电流过大的问题，提出了一种削弱异步发电机并网暂态的新方法，在异步发电机Y。型接线定子中性点串入一电阻，三相顺序延时合闸并网。理论分析、仿真和模拟实验结果表明，该方法同三相线路中分别串联电阻的方法相比在并网瞬间冲击电流的抑制效果上几乎是等效的。而由于该方法只需要一个电阻及旁路开关，因此比传统的三相串入电阻法更加经济。文章还通过理论分析推导出了中性点电阻的最佳取值表达式，以用于该方法的具体实施。
침대풍력발전궤재직접병망방식하산생적잠태충격전류과대적문제，제출료일충삭약이보발전궤병망잠태적신방법，재이보발전궤Y。형접선정자중성점천입일전조，삼상순서연시합갑병망。이론분석、방진화모의실험결과표명，해방법동삼상선로중분별천련전조적방법상비재병망순간충격전류적억제효과상궤호시등효적。이유우해방법지수요일개전조급방로개관，인차비전통적삼상천입전조법경가경제。문장환통과이론분석추도출료중성점전조적최가취치표체식，이용우해방법적구체실시。
In allusion to intense transient current impaction due to direct grid-connection of induction wind turbine generator, a new method to suppress such a transient current impact is proposed, that is, a resistance with a parallel by-pass switch is connected in series into the grounding circuit of wye-connected stator windings and three phases of the induction generator are connected to power grid in sequence with time-delay. Results from theoretical analysis, digital simulation and simulation experiment show that as for the effect of suppressing current impact at grid-connecting moment the proposed method is almost equivalent to traditional method of connecting three resistances in series to each phase, however the proposed method only need a resistance and a by-pass switch connected in parallel with the resistance for an induction generator, so the proposed method is more economical.