电压骤降下双馈电机撬棒投切时刻对电网的无功功率影响

The Switching Time of the Active Crowbar for the Impact of Reactive Power Grid During the Power Grid Voltage Dips

风力发电机规模和单机容量不断增大,电网对风力发电机之类的可再生能源并网有着极其严格的要求,其中最具挑战性的要求是低电压穿越,即在电网出现跌落时,要求风机在一定时间内不得脱网,直至发电机发出一定的无功功率帮助电网恢复。本文研究在电网出现大幅跌落时,通过控制撬棒投切的不同时刻,来讨论是否其投切时刻影响着系统从电网吸收的无功功功率,最终通过合理的投切时刻来最大程度上减少系统从电网吸收的无功功率,帮助电网更好的恢复。

With the fast development of wind generation system, and great increasing for the unit capacity, It has a strict request for the renewable energy such as wind energy which want to link the power grid. The most requirements challenging is the LVRT（Iow voltage ride through）.During the power grid voltage dips, the wind generation system shouldn＇t break away for the power gridl the point of this article is that when the power grid dips, Control the different moment of switch time of the active crowbar, to find the best moment for the active crowbar which has the minimal impact for the power grid, and reducing the voltage recovery absorbed from the grid reactive power, more conducive to the recovery of power.