Method for predicting impulse over voltage of generator

Abstract

A method for predicting impact over-voltage of generator includes using generator equivalent-actually operated by generator active transient state circuit to monitor impact over-voltage at entrance end of generator in real time through setting up generator active transient state circuit model, reappearing and restructuring impact over-voltage being used as entrance impact voltage source of said transient sate circuit, deriving out network transient state circuit formed by said active transient state circuit and said voltage source for predicting over-voltage distribution on stator winding and over-voltage damage on generator.

Description

technical field [0001] The invention relates to a generator impulse overvoltage prediction method, belonging to electrical engineering applications. Background technique [0002] With the rapid development of the modern national economy and the increasing demand for electric energy, the single-unit capacity of power generation equipment has been increased, and large or giant generator sets have been continuously put into power grid operation. Due to the increase of the voltage level of the large power grid and the acceleration of the "black start" process of the power plant, the overvoltage situation is more serious. Impulse overvoltage (operating overvoltage, lightning overvoltage) is more harmful to large-capacity generators. These impulse overvoltages are unevenly distributed on the stator windings of the generator, causing internal insulation breakdown of the generator and inducing insulation breakdown. Accidents directly affect the safe operation of generating units, e...

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Problems solved by technology

However, literatures (1), (2) and (3) all use the generator passive transient circuit to deal with the actual running generator, and the error in predicting the generator impulse overvoltage increases

Due to the induced electromotive force on the conductors of the stator windings of large-capacity generators in actual operation, it is difficult to accurately describe the impulse overvoltage using the passive transient circuit model, so the prediction of the overvoltage distribution of the stator winding is not consistent with the actual operation.

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