The invention provides a doubly-fed
induction generator control method based onan
energy storage device. The
energy storage deivceis mainly used for maintaining the
voltage stability of a fault transient
DC bus of a power network. The specific method is that the
energy storage device is connected with the
DC bus, the rotor-side converter adopts
constant voltage, and the grid-side converter cooperates with the control strategy of the energy storage device to keep the
DC bus voltage constant. When a fault occurs at the connection point, the
voltage drop of the connection point is detected, and then the energy storage device is put into use to stabilize the voltage of the DC
bus bar during the fault. At the same time, as the
DC bus voltage is no longer controlled by the grid-side converter, the grid-side current command is calculated according to the active power of the rotor side, which is used for the transmission of the active power from the rotor side to the
power grid. At that same time, the residual capacity of the rotor convert can be used to output reactive pow to the power network and to support the voltage of the parallel connection point. The invention has the advantages ofimproving the voltage dynamic performance of the
machine terminal, improving the
voltage stability of the DC
bus bar, reducing the capacity of the energy storage device and the like.