Voltage Sag Response of PWM Inverters for Variable-Speed Wind Turbines

摘要

The voltage sag response of PWM inverters is analyzed for a candidate de-link voltage control system. It is shown that the voltage sag response is mainly determined by the dynamics of the de-link voltage and the control system. PWM inverters are found to be robust against voltage sags, but the remaining grid voltage limits the maximum active power that can be delivered to the utility grid.