CAJ | 학술논문

随着双馈感应发电机(DFIG)的大规模应用及对其低电压穿越能力(LVRT)要求的提高，关于电网电压跌落时刻DFIG的暂态过程及 LVRT 改进措施的研究也越来越多；但是，之前的研究无论是用仿真方法还是数学手段，大都进行了一系列省略及近似，包括忽略定子电阻及认为定转子漏感相同等，这导致对DFIG暂态性能的研究及仿真计算的准确性受到不同程度的影响。文中首先从理论上对电网电压对称跌落后DFIG的暂态性能进行了精确计算和分析，揭示了定子磁链的暂态自然分量变化的本质规律，得到了转子参数对发电机各暂态衰减量的不同影响。然后，提出了一种新的Crowbar电路结构，并给出了 Crowbar 电阻和转子漏感的最优化参数设计方法。最后，采用MATLAB/Simulink对所提方案进行了仿真研究，验证了理论计算和所提方法的正确性及有效性。
수착쌍궤감응발전궤(DFIG)적대규모응용급대기저전압천월능력(LVRT)요구적제고，관우전망전압질락시각DFIG적잠태과정급 LVRT 개진조시적연구야월래월다；단시，지전적연구무론시용방진방법환시수학수단，대도진행료일계렬성략급근사，포괄홀략정자전조급인위정전자루감상동등，저도치대DFIG잠태성능적연구급방진계산적준학성수도불동정도적영향。문중수선종이론상대전망전압대칭질락후DFIG적잠태성능진행료정학계산화분석，게시료정자자련적잠태자연분량변화적본질규률，득도료전자삼수대발전궤각잠태쇠감량적불동영향。연후，제출료일충신적Crowbar전로결구，병급출료 Crowbar 전조화전자루감적최우화삼수설계방법。최후，채용MATLAB/Simulink대소제방안진행료방진연구，험증료이론계산화소제방법적정학성급유효성。
With the increasing penetration of wind power into electric power grid,large scale integration of the doubly fed induction generator (DFIG) in wind farm and its low voltage ride-through (LVRT) capability stipulated stringently in the revised grid code have led to extensive researches on the detailed theoretical analysis of the DFIG dynamic characteristics and its LVRT enhancement capability.However,no matter whether mathematical analysis or simulation calculation was used in previous investigations,different kinds of negligence and assumptions have emerged,such as neglecting stator resistance or assuming the same leakage inductance between stator and rotor sides,which will result in different influences on the accuracy and validity of the dynamic characteristics analysis and the LVRT control design.In order to overcome these drawbacks,a completely accurate mathematical dynamic DFIG model is developed during the three-phase voltage dips without any negligence,and different interactivities between the generator”s rotor parameters and the damping speed and degree of the generator”s electro-magnetic variables have been derived.Based on the proposed calculation and analysis,the improved Crowbar circuit prototype and the optimal parameters design of the Crowbar are given.The simulation results in MATLAB/SimuLink have totally verified the validity and efficiency of the theoretical calculation and the proposed scheme.