中文摘要：

频率是电力系统稳定性研究的一个重要参量,而节点动态频率响应特性因其较之于静态频率特性的优点日益受到重视.提出一种基于曲面拟合的电力系统节点动态频率响应特性的影响因素分析方法,可以直观地反映节点频率特性与影响因素之间的关系,并得到相应的系统功频特性系数K以调整负荷.首先,对EPRI-36系统进行仿真分析,通过改变初始平衡功率P_0、功率扰动ΔP和电气距离S3个主要影响因素,获取不同采样点,得到相应的K值.然后运用改进的曲面拟合方法对K值进行预测及影响效果分析.对2种情况下的K值进行误差分析,结果表明了提出的系统功频特性系数确定方法的有效性,可以为调度部门在系统功率扰动导致频率变化时的处理提供参考.

英文摘要：

Frequency is an important operating parameter of power system; and nodal dynamic frequency response characteristics get attention increasingly for its advantage compared to static frequency character- istic. A method of analyzing nodal dynamic frequency response characteristics influencing factors based on curved surface fitting is put forward in this article. Moreover, relationship between them is reflected direct- ly and appropriate frequency characteristic coefficient is obtained to adjust the load. Simulation analysis of EPRI-36 system is executed firstly by means of altering P0 ,△P and S to get different sampling points and corresponding K values. Afterwards, K values are forecasted based on modified curved surface fitting in addition to effect analysis. Errors between simulation values and fitted values are calculated. The results show that the method proposed to obtain K values is effective, so as to provide reference for the scheduling department when frequency deviation is caused by power disturbance.