摘要
分析电网对称故障时,双馈感应风力发电机定子磁链变化过程、导致定转子过电流的原因、电网故障发生具体时刻及故障程度对双馈感应发电机定转子的影响,提出一种双馈感应风力发电机转子侧变换器低电压穿越控制策略,改善了双馈感应发电机在电网故障时定、转子过电流的情况,实现了双馈感应发电机在电网对称故障时的低电压穿越。在理论分析基础上,建立双馈感应发电机转子侧变换器低电压穿越控制模型和3 kW双馈感应发电机励磁变换器低电压穿越控制实验系统。实验结果表明,所提出的双馈感应发电机低电压穿越控制策略动态响应快、方法行之有效。
Based on analysis of change of the doubly fed induction generator（DFIG） stator flux,the cause of over current both in stator and rotor and the voltage sag occurring time and voltage sag percent effects on the DFIG stator and rotor during the symmetric grid fault,a new DFIG rotor side converter low voltage ride though（LVRT）control method to prevent the DFIG over current is proposed in the paper.Af-ter the theoretical analysis,the model of LVRT control strategy is established.A 3 kW DFIG excitation control experimental system is established.The test results validate the LVRT control method of DFIG which has a quickly dynamic response and is effective.
出处
《电机与控制学报》
EI
CSCD
北大核心
2010年第7期1-6,共6页
Electric Machines and Control
基金
教育部博士点基金(20060280018)
关键词
双馈感应风力发电机
低电压穿越
电网对称故障
转子侧变换器
doubly fed induction generators
low voltage ride through
symmetric grid fault
rotor side converter
