水轮发电机组的模块化建模与仿真

Modeling & Simulation of Hydropower Generator Modularization

关于开发建立实时精确的水轮发电机仿真系统,由于水轮发电机组由同步发电机、励磁系统、水轮机及其调速系统构成,系统的数学模型存在强非线性,传统上常采用牛顿法联立求解方程组仿真效果差。为解决上述问题,提出了面向水轮发电机组各物理子系统的模块化仿真模型,采用分割求解法建立了同步发电机、励磁系统、水轮机及其调速系统各物理子系统的数学模型,用隐式梯形积分法建立了模型,形成了水轮发电机组模型库。组成的仿真系统不仅可达到足够的计算精度及计算速度,而且有效简化了水轮发电机组模型的开发及维护工作量,适用于水轮发电机组的快速电磁暂态和中长期的机电暂态过程研究,可用于各型水电站动态全过程仿真。结果证明系统运行的精度和速度的有效性,为研究提供参考。

A hydro-power generator is composed of synchronous machine,excitation system,hydro-turbine and its governor system,and the equations of which are of great nonlinear,which are traditionally soluted by Newton method.This paper presented a method for the whole dynamic process simulation of hydropower generators.The modularized model was physical-subsystems-oriented,and the intersected resolving method was used to built the models of synchronous machine,excitation system,hydro-turbine and its speed governor system,which can be used for the electromagnetic transients and electro-mechanical process simulation of a hydropower plant.Compared with the method based on Newton,this method can not only fufill the accuracy and speed of calculations,but also simplified the simulation model for hydropower plants.The results obtained by this method show good agreements to those by PSASP.