基于变电站线路出口信息的小水电群等值及参数辨识研究

摘要:

针对同调法和模态法动态等值对外部系统做等值简化时，需要尽知外部系统的结构、参数以及各工况下的运 行状态的局限性，对于集中上网中小水电机群发电机参数，励磁、调速参数部分未知或全部未知情况下，提取较大扰 动后变电站高压侧出线的电压电流动态响应录波信号，并基于FOXPＲO 平台，结合PSASP 电力系统分析软件实现连 续变参数自动分析计算，将集中上网水电机群等值为一台机组，并准确辨识出等值机的相关参数。最后在四川电网 某小水电机群上进行了仿真验证，试验结果表明，该等值方法实用可行，并具备一定的鲁棒性。

Abstract:

There are the limitations of homology method and modal method during equivalent simplification of external equivalent system by dynamic equivalence，that is，the structure and parameters of the external system under various operating conditions should be known． For the part or all of generator parameters excitation and governing speed parameters of the small and medium － sized hydroelectric generating group with centralized access to the grid are unknown，the dynamic response signals of voltage and current in high － voltage side of substation after major disturbances are extracted，and based on FOXPＲO platform， the automatic analysis and calculation of continuous variable － parameters is realized combined with PSASP，which makes the online hydroelectric generating group be equivalent as a unit，and accurately identifies its relevant parameters． Finally， the simulation of a small hydroelectric generating group in Sichuan power grid is carried out，and the test results show that the equivalent method is practical and feasible with a certain robustness．