大扰动下同步发电机非线性模型和参数的研究

项目名称： 大扰动下同步发电机非线性模型和参数的研究

项目编号： No.51307049

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 电工技术

项目作者： 康锦萍

作者单位： 华北电力大学

项目金额： 26万元

中文摘要： 电力系统发生突然短路、甩负荷等大扰动的振荡过程中，发电机机端电压可能短暂超过额定电压、功率角可超过90度。已有研究表明，此时发电机中存在磁路饱和、磁场畸变、交叉磁化等多个非线性因素的共同作用。在系统仿真分析以及发电机励磁控制策略获取方面，迄今为止发电机都采用基于空载特性的饱和模型，该模型只能反映出主磁路饱和的影响。本项目以场路网耦合的时步有限元模型为工具，研究系统分析软件中发电机实用模型的适用范围，揭示发电机多因素非线性对饱和参数和扰动过程中发电机发电机运行行为影响的规律。然后，根据系统分析的需要，建立发电机变饱和参数的park模型和基于负载非线性特性修正的实用模型，为电力系统稳定分析提供技术支持。

中文关键词： 同步发电机；扰动；参数；非线性；

英文摘要： The terminal voltage of generators can be more than rated voltage and power angle may be be more than 90 degree under large disturbance conditions such as sudden short-circuit and load rejection. Existing researchs show that nonlinear characteristics of generators are affected by iron saturation and cross-magnetizing and magnetic field distortion. So far saturated models of generators based on on-load nonlinear characteristics are still taken in system simulation analysis and decision of generator excitation control strategy and the models can only reflect main magnetic path saturation effect. The project studies the adaptations of generator practical models in power system analysis software by means of Field-Circuit-Network Coupled Time-Stepping Finite Element Models. Influences of the multiple nonlinear characteristics of generators on saturated parameter and operating behaviors are also studied.Then Park models of variable parameter and improved models of generator based on load nonlinear series considering multiple factors nonlinearity are presented to provide technical support for the power system stability analysis.

英文关键词： synchronous generator；disturbance；parameter；nonlinear；