采用异步电机的风电场并网运行系统短路故障对电网稳定性影响的仿真分析

The Wind Power System Stability Analysis Aftershort-circuit

短路故障是电网经常遇到故障。含风力发电系统的电网发生短路故障时,电网电压降低,这时如果不采取措施,风电场仍然从电网吸收无功,则会导致电网电压继续降低。采用风力发电系统的数学模型,分析了电网发生短路故障,比较了不采取保护和采取保护后发电机功角,电压以及频率的变化,采用PSASP仿真说明了采用减小风电场功率输入的方法可以使系统达到稳定。

Short-circuit fault is often encountered in power system fault, the power grid voltage would drop when the short--circuit fault occurs in the grid with the wind power generation system, if no measures are taken at this time, wind power is still absorbing reactive power from the grid, it will lead to lower voltage. To solve this problem, This paper introduces the wind power system mathematical models, analysis the power system with short --circuit fault, and compare the changes of the generator power angle, voltage and frequency with not taking the protection and taking protection. Taking PSASP simulation to describe that the system can achieve the stability with reducing the importation of wind power.