新疆大学学报（自然科学版）
新疆大學學報（自然科學版）
신강대학학보（자연과학판）
Journal of Xinjiang University (Natural Science Edition)
2015年
3期
273-278
,共6页
电网不对称故障%双馈风电机组%Crowbar电路%运行特性
電網不對稱故障%雙饋風電機組%Crowbar電路%運行特性
전망불대칭고장%쌍궤풍전궤조%Crowbar전로%운행특성
asymmetrical grid fault%doubly-fed induction generator%Crowbar circuit%operating charac-teristics
基于含有Crowbar电路的双馈风电机组的结构和数学模型，研究了电网故障后DFIG定子磁链方程。以PSCAD为平台，构建双馈风电机组并网模型，仿真分析了电网不对称故障时风电机组定子磁链的动态响应过程，研究了由定子磁链的负序成分引起的电流不平衡、电磁转矩振荡、功率波动等一系列动态响应过程。研究发现Crowbar保护电路有助于实现风电机组的低电压穿越，但不能抑制负序分量。电网不对称故障时，DFIG电磁转矩振动大，影响风电机组的稳定运行。
基于含有Crowbar電路的雙饋風電機組的結構和數學模型，研究瞭電網故障後DFIG定子磁鏈方程。以PSCAD為平檯，構建雙饋風電機組併網模型，倣真分析瞭電網不對稱故障時風電機組定子磁鏈的動態響應過程，研究瞭由定子磁鏈的負序成分引起的電流不平衡、電磁轉矩振盪、功率波動等一繫列動態響應過程。研究髮現Crowbar保護電路有助于實現風電機組的低電壓穿越，但不能抑製負序分量。電網不對稱故障時，DFIG電磁轉矩振動大，影響風電機組的穩定運行。
기우함유Crowbar전로적쌍궤풍전궤조적결구화수학모형，연구료전망고장후DFIG정자자련방정。이PSCAD위평태，구건쌍궤풍전궤조병망모형，방진분석료전망불대칭고장시풍전궤조정자자련적동태향응과정，연구료유정자자련적부서성분인기적전류불평형、전자전구진탕、공솔파동등일계렬동태향응과정。연구발현Crowbar보호전로유조우실현풍전궤조적저전압천월，단불능억제부서분량。전망불대칭고장시，DFIG전자전구진동대，영향풍전궤조적은정운행。
Based on the structure and mathematical model of the DFIG with Crowbar, the stator flux equation of the DFIG during asymmetrical grid fault is studied. The simulation model of DFIG is constructed based on PSCAD. For the asymmetrical grid fault, dynamic response of DFIG stator flux is simulated and analyzed. A series of dynamic response processes caused by negative sequence components of the stator flux are studied, such as current imbalance, electromagnetic torque oscillation, power fluctuation, etc. It is found that the Crowbar protection circuit has contributed to the LVRT of DFIG, but can’t restrain the negative sequence component. During asymmetrical grid fault, the electromagnetic torque vibration is larger, influences the stable operation of the wind turbine.
