电网与清洁能源
電網與清潔能源
전망여청길능원
ADVANCES OF POWER SYSTEM & HYDROELECTRIC ENGINEERING
2015年
7期
106-113
,共8页
DFIG%LVRT%不对称短路%变流器控制%谐波分析
DFIG%LVRT%不對稱短路%變流器控製%諧波分析
DFIG%LVRT%불대칭단로%변류기공제%해파분석
DFIG%LVRT%asymmetric short circuit%con-verter control%harmonic analysis
双馈感应发电机（DFIG）作为当前应用最广泛的风力发电机，其特殊的结构使其故障运行特性十分复杂，尤其在低电压穿越（LVRT）运行状态下，已对电网安全运行和保护控制的顺利实施造成一系列影响。目前对DFIG的短路电流特性已有大量研究，但是针对定转子电流谐波特性的研究还鲜有报道。考虑LVRT的影响，对电网不对称故障情况下DFIG定、转子谐波电流的特性进行研究。从电磁暂态过程的角度详细推导了Crowbar动作后的DFIG定子谐波电流的解析表达式；在Crowbar未动作时，从转子侧变流器影响机理出发，研究了由变流器控制引起的定、转子谐波电流的产生机理。所得结论通过仿真进行了验证。
雙饋感應髮電機（DFIG）作為噹前應用最廣汎的風力髮電機，其特殊的結構使其故障運行特性十分複雜，尤其在低電壓穿越（LVRT）運行狀態下，已對電網安全運行和保護控製的順利實施造成一繫列影響。目前對DFIG的短路電流特性已有大量研究，但是針對定轉子電流諧波特性的研究還鮮有報道。攷慮LVRT的影響，對電網不對稱故障情況下DFIG定、轉子諧波電流的特性進行研究。從電磁暫態過程的角度詳細推導瞭Crowbar動作後的DFIG定子諧波電流的解析錶達式；在Crowbar未動作時，從轉子側變流器影響機理齣髮，研究瞭由變流器控製引起的定、轉子諧波電流的產生機理。所得結論通過倣真進行瞭驗證。
쌍궤감응발전궤（DFIG）작위당전응용최엄범적풍력발전궤，기특수적결구사기고장운행특성십분복잡，우기재저전압천월（LVRT）운행상태하，이대전망안전운행화보호공제적순리실시조성일계렬영향。목전대DFIG적단로전류특성이유대량연구，단시침대정전자전류해파특성적연구환선유보도。고필LVRT적영향，대전망불대칭고장정황하DFIG정、전자해파전류적특성진행연구。종전자잠태과정적각도상세추도료Crowbar동작후적DFIG정자해파전류적해석표체식；재Crowbar미동작시，종전자측변류기영향궤리출발，연구료유변류기공제인기적정、전자해파전류적산생궤리。소득결론통과방진진행료험증。
Double fed induction generator (DFIG) is the most widely used wind generator. Because of its special struc-tural design the operating characteristic of DFIG becomes much complicated during fault,especially under the low voltage ride through,and the output of DFIG has caused a series of effects on the safe operation of power grid and relay protection. At present a lot of research has focused on the short-current characteristic of DFIG,but the study of the harmonic current is rarely reported. This paper studies on the stator harmonic current and rotor harmonic current of DFIG during asymmetric fault with consideration of the effect of LVRT. From the perspective of electromagnetic transients,the analytic expressions of the DFIG stator harmonic current are derived in detail under the condition of Crowbar action. The generation mechanism of the harmonic current on the stator and rotor of DFIG caused by the converter control is researched under the condition of the crow-bar inaction. The conclusion made is verified by simulation.
