CAJ | 학술논문

针对双馈感应电机低电压穿越提出一种新的撬棒电路。传统的Crowbar电路采用固定阻值的电阻已经很难满足抑制转子电流、缩短撬棒电路工作时间的要求，有些研究提出了Crowbar并联动态电阻的双馈风力发电机低电压穿越方案，但接入Crowbar电路的并联电阻只是给出一个上限值，不能在电网电压不同程度跌落情况下都能取得好的穿越效果。因此，提出一种基于电流变化率大小动态改变Crowbar电阻值的双馈感应电机低电压穿越方案。此方案与Crowbar并联动态电阻方案进行比较，Matlab／Simulink仿真结果表明上述方法效果更好。
침대쌍궤감응전궤저전압천월제출일충신적효봉전로。전통적Crowbar전로채용고정조치적전조이경흔난만족억제전자전류、축단효봉전로공작시간적요구，유사연구제출료Crowbar병련동태전조적쌍궤풍력발전궤저전압천월방안，단접입Crowbar전로적병련전조지시급출일개상한치，불능재전망전압불동정도질락정황하도능취득호적천월효과。인차，제출일충기우전류변화솔대소동태개변Crowbar전조치적쌍궤감응전궤저전압천월방안。차방안여Crowbar병련동태전조방안진행비교，Matlab／Simulink방진결과표명상술방법효과경호。
This paper presents a new crowbar protection topology for low voltage ride through ( LVRT) of doubly-fed induction generator ( DFIG) based on wind turbines.Traditional DFIG crowbar used a fixed crowbar resistance is dif-ficult to meet the requirements of suppressing the rotor current and shortening the working time of crowbar at the same time.Parallel dynamic resistance are used in some papers, but only an upper limit be given that can’ t capable to all the dips during grid fault.From the discussion, a new LVRT of DFIG scheme, based on a crowbar resistance con-trolled by average slop of current, is proposed.In the case study, a comparison with a parallel dynamic resistance method based on RSC control is given.Matlab/Simulink simulation results show that the proposed method is advanta-geous for fault over-current protection.