摘要
双馈风电机组传动系统是典型的欠阻尼系统,电网故障条件下的电磁转矩动态响应容易激发轴系扭振。分析结果表明,电网故障期间影响轴系扭振的主要因素是电磁转矩稳态值,在此基础上,结合投入Crowbar的DFIG稳态运行等效电路,分析了发生三相对称故障和单相对地故障时机组的稳态转矩表达式,进一步分析了影响电磁转矩特性的因素,针对故障期间PI调节器积分环节累积误差会对电磁转矩产生影响,采用了故障恢复时刻积分值清零的措施。最后对Crowbar阻值选取和故障积分清零在PSCAD下进行仿真对比,验证了分析的正确性。
Double-fed induction generator（DFIG） wind energy generation system （WEGS）＂s drive-chain is a typical under damping system, and the torsional vibration of shaft can be stimulated easily by the transient response of electromag- netic torque caused by power grid fault. It is concluded that the main factors influencing the torsional vibration under grid fault is the steady-state value of electromagnetic torque. On this basis, the steady state equivalent circuit with Crowbar switched-on of DFIG was used to analyze the steady-state torque under three-phase symmetrical fault and single phase to ground fault. The influence on the torsional vibration of Crowbar resistance under different speed was analyzed. As the inte- gral of PI regulator is cumulating error during fault occures, clear the integral value at fault recovery time was suggested. Finally the Crowbar resistance selection and fault integral reset was verified by the PSCAD simulation.
出处
《微特电机》
北大核心
2015年第5期22-25,29,共5页
Small & Special Electrical Machines
基金
中国电力科学研究院实验室开放基金项目
国家电网公司项目
关键词
双馈机组
电网故障
轴系
扭振
撬棒
阻值
电磁转矩
double-fed induction generator （DFIG）
grid fault
drive-chain
torsional oscillation
Crowbar
resistance
electromagnetic torque
