The invention discloses a
wind power plant sub-synchronous
resonance suppression method based on a parallel
voltage source current converter, and belongs to the technical field of the stability analysis and control of the power
system. The method comprises the following steps: measuring current on a
wind power cluster convergence line to obtain connecting
line current; designing a low-pass filterand a band rejector filter to filter the connecting
line current so as to obtain the connecting line sub-synchronous current; designing
phase compensation and proportion
gain loop so as to obtain sub-synchronous damping current, wherein a
voltage outer ring enables the device
DC voltage to track a reference value under the effect of a
PI regulator, and an output value is converted through a phaseangle so as to obtain
DC voltage compensation current; adding the
DC voltage compensation current and the sub-synchronous damping current to obtain an output current reference value, wherein a currentinner ring enables the SSO-DS output current to track the output current reference value under the effect of the
PI regulator, the current is injected into the
wind power cluster
system to provide positive damping for the
system, thereby achieving the effect of depressing the sub-synchronous
resonance. The method disclosed by the invention has important significance for depressing the sub-synchronous
resonance problem caused by the wind power integration in a centralized way.