The simulation computation of de-excitation for megaton generator based on MATLAB
Zhixin Huang · 2011
The de-excitation is the last protection line for the generator when it's broken-down.The reliable and quick de-excitation ability dominates the safety level of the generator.In this paper the three conventional de-excitation methods for the synchronous generator in unload condition are studied,the effect of damping winding is considered and Park equations in d,q axis are used.Specially,no-load characteristic(NLC) of generator is represented by analysis expression,so the effect of saturation of NLC on de-excitation is included.Differential equation group is successfully solved with integrators in MATLAB simulation.Finally,an example of de-excitation for a 1000 MW synchronous generator on no-load with linear de-excitation methods is given.The result has practical guidance for the de-excitation system design.