基于灵敏度分析的新能源电力系统同步机组调差系数优化方法

随着新能源的持续并网以及特高压交直流互联电网的形成,电力系统暂态频率稳定事件风险增加。在高渗透率新能源场景下,充分挖掘同步发电机组的调频能力成为提升电力系统频率响应能力的重要手段。针对同步机组的调速器参数,文章利用轨迹灵敏度分析影响最大频率偏差的主导参数,进而通过优化主导参数来提高电力系统的暂态稳定性。通过建立主导参数优化问题的数学模型,解析分析了主导参数对最大频率偏差的影响程度,采用灵敏度分析方法,将非线性优化问题转化为线性规划问题,以减少计算量。在此基础上,文章提出了适用于多机系统的调差系数优化方法,最后通过仿真算例验证了方法的有效性。

Optimization method of synchronous generator adjustment coefficient for power system with high penetration of renewable generation based on sensitivity analysis

High penetration of renewable generation and formation of ultra-high voltage AC/DC power grids increase the risk of transient frequency stability events. One of the most efficient methods to improve the frequency stability capability of the power system is to enhance the frequency regulation capability of the synchronous generators. First, through the trajectory sensitivity, the dominate parameter which influences the maximum frequency deviation was analyzed, and then it is optimized to reduce the maximum frequency deviation of the power system. The mathematical model of the adjustment coefficient optimization problem was established. The effect of adjustment coefficient on the maximum frequency deviation was analyzed analytically, and the nonlinear optimization problem was approximated with a linear programming problem according to the sensitivities to reduce the calculation load. On this basis, an optimization method of adjustment coefficient for multi-machine power systems was proposed. Finally, the effectiveness of this method was verified by simulation examples.