自并励励磁系统灭磁容量计算与仿真分析

Calculation and Simulation Analysis of De-excitation Capacity of Self-shunt Excitation System

摘要:

为保证发电机发生短路等故障时，灭磁系统能够安全、迅速地给发电机灭磁，并将发电机转子绕组中的磁场能量消耗在灭磁回路耗能元件中，文中通过求解同步发电机的五绕组微分方程并计及饱和，采用Matlab编写程序模拟空载误强励、负载误强励、负载三相金属性短路等工况下的灭磁过程，以某电厂参数进行仿真分析计算，并对照实际详细数学分析说明仿真计算结果精确可靠，可用于各种机组的灭磁容量设计，并为未来智能化励磁灭磁系统分析提供技术支撑。

Abstract:

In order to ensure the safe and quick de-excitation of generator by de-excitation system in case of short circuit and other faults of generator, and consume the magnetic field energy in rotor winding of generator in energy consuming elements of de-excitation circuit, the five-winding differential equation of synchronous generator is solved considering saturation, and the de-excitation processes under no-load false forced excitation, load false forced excitation and load three-phase metallic short circuit are simulated by Matlab. Taking the parameters of a power plant for simulation and calculation, the results are verified to be accurate and reliable according to actual and detailed mathmatic analysis, which can be used to design de-excitation capacity of various units and provide technical support for the analysis of intelligent de-excitation system in the future.