Research On Voltage Stability Of Power System With D-PMSG Wind Farm

Higher penetration of wind power will result in wider influence upon power system,the Direct-Drive Permanent Magnet Synchronous Generator(D-PMSG) which has good stability,high efficiency and controllable active power and reactive power has higher rate in real wind farm,there will be more and more D-PMSG wind park,when D-PMSG wind farm has weak connection with power grid,its influence upon voltage stability of power system will not be negligible.The paper on the basis of xinjiang real wind farm operating data and build equivalent modelling of wind farm in accordance with actual operation characteristic of wind farm. The mechanism of voltage stability deterioration of the power grid with the wind farm integration is analyzed. Under the environment of DIgSILENT/PowerFactory, the P-V curve and V-Q curve methods are generally applied to analyze the steady-state voltage stability of three synchronous generators nine buses study case and xinjiang real part power grid in detail.To put up a transient voltage control strategy to enhance transient operation of direct-driven permanent magnet synchronous gererator,utilizing dynamic time-domain simulation method.The power grid transient-state voltage stability is compared by three synchronous generators nine buses study case and the study case integrated with the D-PMSG wind farm.Result shows that the study case integrated with the D-PMSG wind farm transient-state voltage stability is better than the original study case.Finally analyze the D-PMSG wind farm to participate in voltage control of power system.By changing different controllable modes to make the voltage be in normal range,it enhaces the level of steady-state voltage stability of part power system effectively.