电网不对称故障时全功率变流器风电机组控制策略

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...

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

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.