Research On Voltage Stability Of Power System With D-PMSG Based On Back-to-Back PWM Conwerter

In recent years, wind power has more and more influence to power grid with the levelopment. Because of the Direct-Drive Permanent Magnet Synchronous Generator is more ieight,less mechanical failure and achieve very good active power and reactive power lecoupling control for wind energy utilization rate,so it is more and more favour for levelopers and researchers.Ten million degree Permanent Magnet direct drive wind is sprang p, so the influence is increasingly valued for the electric power system. This paper,based on the back-to-back PWM converter,analysis of the influence of the ower system voltage stability with D-PMSG’s wind farms.Firstly,the model of D-PMSG and he dual PWM converter is bulited.The key that proposed static and dynamic two kinds of control strategy with back-to-back PWM converter. During normal operation of maximum ower tracking, active power is more as far as possible,and control back-to-back PWM nverter’s no reactive power;In fault, The back-to-back PWM converter reduce output of the ctive,and output some of reactive power. Secondly,based on some The DaBanCheng xperimental wind farm measured data,and calculated for continuous wave P-V,V-Q ;urve. According to detailed analysis of the curve,it is helps to improve the power system tatic voltage characteristic that putout appropriate reactive power.Finally,transient simulation made in DIgSILENT/PowerFactory software.In this paper, the transient coordinated control the back-to-back PWM converterand and pastly the network side inverter control is imulated,comparative and analysis of three-phase short-circuit ground fault voltage droped mplitude and fault critical clearance time.finally,it is concluded that back-to-back PWM converter the transient coordinated control strategy for the improvement of the transient oltage stability of power grid better in this paper.