Coordinated var-voltage control during fault of wind power system

The wind farm with Crowbar protection will change from reactive power source to reactive power load during the low-voltage ride-through,which aggravates the faulty power system.A real-time coordinated control strategy of reactive power and voltage is proposed and the RTCCS(Real Time Coordinate Control System) is built,which carries out the real time coordinated control of reactive power of wind farm according to the voltage level and the action of Crowbar protection during the fault.STATCOM is applied in RTCCS for reactive power compensation according to the var-voltage regulation requirement of wind farm.It improves the fault ride-through ability of wind farm and provides the reactive power and voltage support for power system during the fault.Its correctness and effectiveness are verified by simulative results.