电力系统中长期稳定分析用联合供水水电机组非线性仿真模型

Nonlinear Simulation Model of Hydroelectric Generating Set with Joint Water Supply for Middle and Long Term Stability Analysis of Power System

针对共用长引水系统的水电机组间的水力耦合关系,推导建立其数学模型,并根据电力系统仿真计算的需求,对模型进行降阶处理。针对水电站调压井结构复杂的特点,提出以调压井结构系数动态修正调压井溢流时间常数的方法。模型综合考虑了调压井和共用引水管段对电力系统中长期动态过程的影响,仿真结果与实测扰动响应的对比表明,模型具有较高的精度,可作为现有电力系统仿真计算用水电机组模型的有效补充。

Based on the theoretical derivation of hydro -mechanical coupling relationship between the hydroelectric generating sets sharing the long common conduit , the nonlinear hydro turbine model with sharing long diversion system is established and order-reduced in accordance with the demand of power system simulation .According to the characteristics of complex struc-ture of surge shaft , a method to correct the overflow time constant of surge shaft with its structure coefficients is proposed .This hydro turbine model can reflect the influence of surge shaft and sharing common conduit on the long term dynamic process in power system , the accuracy of model is proved by the comparison of simulation results and actual recording data in power sys -tem , which can be used as part of the hydroelectric generating set model for the simulation and calculation of the existing pow -er system.