电压控制的DFIG对风火打捆系统暂态稳定性的影响

摘要

风火打捆外送是解决风电消纳问题的重要措施,但风火打捆系统联络线潮流重,在发生大扰动时系统失稳风险较大.因此,提高风火打捆系统的暂态稳定性具有重要意义.结合简单风火打捆系统,采用等面积法则分析了DFIG采用定电压控制、定功率因数控制对系统暂态稳定性的影响.DFIG采用定电压控制,在扰动后可以向系统提供较多的无功功率,从而提高发电机电压,增加发电机输出的有功功率,增大减速面积,从而提高系统的暂态稳定性.最后,通过仿真算例分析验证了本文的结论.%Wind-thermal bundled supply system is a vital solution to wind consumption,but heavy power flow on connecting line in wind-thermal bundled system increases system instability during big disturbance.Therefore,it is important to improve transit stability of wind-thermal bundled system.Power system transient stability with voltage control DFIG and fixed power factor control DFIG is analyzed by equal area criterion respectively.Voltage control based DFIG can supply more reactive power to the system,which increase generator voltage,generator power output and deceleration area,and improve system transient stability.Simulation results validate proposed conclusion.