电网不对称故障时全功率变流器风电机组控制策略  

Simulation on the Control Strategy for a Full Power Converter of Wind Generation Under Grid Fault Conditions

作　　者：陈毅东[1,2] 杨育林[1] 王立乔[2] 孙俊杰[2] 万承宽[2] 

机构地区：[1]燕山大学机械工程学院,河北省秦皇岛市066004 [2]燕山大学电力电子节能与传动控制河北省重点实验室,河北省秦皇岛市066004

出　　处：《电力系统自动化》2011年第7期75-80,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50837003);河北省科技支撑计划资助项目(11213909D)~~

摘　　要：电网导则要求并网风电机组在电网电压在一定范围内瞬间跌落时不脱网运行。为满足这一要求,研究了全功率变流器风电机组在电网故障时的运行特性。建立了不对称电网故障下网侧变流器的数学模型,分析了正、负序双电流控制策略存在问题的原因,提出了一种直流侧采样电压带变频陷波函数的双电流控制策略,并针对电网频率波动的情况加入锁相环对陷波器进行实时修正。仿真结果表明:当电网出现不对称故障和频率波动时,所提出的控制策略较正、负序双电流控制策略具有更好的动态调节性能。To meet the grid code requirements on the wind turbine generators low voltage fault ride through capability,the characteristic of a fully converted wind turbine is studied under unbalanced system conditions.A model of the power converter under unbalanced grid conditions is established,and the problem existing in the control strategy of positive and negative sequence dual current is analyzed,a DC sample voltage with variable frequency notch function of dual current control strategy is proposed.When the system frequency fluctuates,a phase-locked loop for correcting the notch filter is added.Simulation results show that the proposed control strategy of dual current,DC feedback voltage with notch function has significant better dynamic regulation performance under asymmetry grid conditions.

关 键 词：风力发电 全功率变流器 鼠笼式异步发电机 电网不对称故障 双电流环控制 

分 类 号：TM315[电气工程—电机]