一种实用的双馈风电机组高电压穿越方案

Applied Method of High Voltage Ride-through for Doubly-fed Wind Power Generation Systems

随着风电并网导则对风电机组的稳定性、可靠性要求日益提高,研究风电机组的高电压穿越技术十分必要。提出一种基于无功支撑和硬件耗能的双馈风电机组高电压穿越控制方案,在电网电压升高到1.1倍标幺值及以上时,一方面向电网中吸收无功功率;另一方面利用耗能电阻Chopper消耗直流侧多余的能量以保护电机与变流器。仿真结果表明该方案能够实现双馈风电机组的高电压穿越,且能够降低机组端电压,有利于故障电网的恢复。

With the improvement of stability and reliability requirements for wind power generation systems inwind turbine grid guidelines,the study of the high voltage ride through technologies of wind turbines is necessary. Ahigh voltage ride through control strategy with reactive power support and energy-consuming hardware was putforward. When the grid voltage rose to 1.1 p.u. or above 1.1 p.u.,on one hand,the doubly-fed converter absorbedreactive power from the grid. On the other hand,the Chopper resistance consumed excess energy on the DC side toprotect the generator and the converter. The simulation results show this strategy can achieve high voltage ridethrough of the double-fed wind turbine,and also reduce the terminal voltage,which benefits for the fault recovery ofpower grid.