大规模风电集中接入对电力系统暂态功角稳定性的影响(二):影响因素分析

Impact of Large-scale Wind Power Centralized Integration on Transient Angle Stability of Power Systems——Part Ⅱ: Factors Affecting Transient Angle Stability

该文作为2篇系列文章的第2篇,重点分析双馈风机组成的大规模风电场集中接入电力系统后影响系统暂态功角稳定性的关键因素。在第1篇文章理论分析的基础上,根据扩展等面积定则,讨论了同步机出力调整、风电渗透率和风电场选址等因素起主导作用时,电力系统暂态功角稳定性的变化。然后,从暂态功角稳定的角度出发,总结出风电接入情况下指导电力系统规划和调度的一般规律。最后,通过在双机互联系统上进行的数值仿真验证所提规律的正确性。结果表明,从本质上看,各种因素的变化如果有助于减小前向机群的有功出力,则有助于提高电力系统的暂态功角稳定水平。

As the second part of this two-part paper, this paper focused on the factors that had impacts on the transient angle stability of power systems with large-scale wind power farms consisted of doubly-fed induction generators（DFIG）. Based on the theoretic analysis in the first part of this paper, how wind power penetration influenced power system transient angle stability was discussed according to the extended equal area criterion when the factors, such as the synchronous generator dispatch pattern, the siting of wind farms and the wind power penetration rate, played a leading role. Then general rules for power system planning and dispatching considering transient angle stability of power systems with high wind power penetration rate were summarized. Finally, the proposed rules were verified by simulations on a two-machine power system. The results show that in essence, if the variation of the factors helps reduce the active power of synchronous generators of which the power angle swings forward, it is beneficial to transient angle stability of power systems.