基于相量量测的中小型水电集群动态等值方法研究

A dynamic equivalent method for centralized small and medium hydropower generator group based on phasor measurement information

为了准确分析含中小型水电集群系统,针对中小型水电集群,提出了一种基于相量量测的动态等值建模方法。该方法以估计等值为基础,将扰动后互联区域间联络线上相量量测信息作为输入量,利用四阶龙格库塔法求解发电机动态方程,借助改进PSO算法实现参数的寻优更新,最终得到等值模型的各个参数。基于该方法对四川电网某地区中小型水电集群上进行动态等值建模,仿真结果证明了该方法的有效性与精确性。同时,基于仿真与负负荷表示的中小型水电集群对比分析,仿真结果证明了该方法的优越性与实用性。

To analyze power system with centralized small and medium hydropower generator group accurately, this paper proposes a method to build a dynamic equivalent model of small and medium hydropower generator group based on phasor measurement information. Some procedures, such as inputting the phasor measurement information which exists in interconnection line after a disturbance, solving the generator dynamic equations based on 4-order Runge-Kutta method, and using modified PSO algorithm to update each parameter, are used in this method based on estimate equivalent method. For validation purposes, the proposed method is applied to the centralized small and medium hydropower generator group in Sichuan province. Results show that the reduced system retains the dynamic performance of the original system with good accuracy. Further simulations are made to compare with small and medium hydropower generator group which represent as a negative load. Results prove the superiority and practicability of the dynamic equivalent method.