Overexcitation limitation optimization method and system for excitation regulator

Abstract

An overexcitation limiting method and system for an excitation regulator, the overexcitation limiting method for the excitation regulator comprising: determining an inertia time constant; collecting an excitation current of a generator, and calculating a first calculation result according to the inertia time constant and the excitation current; comparing the magnitude of the first calculation result with the magnitude of a first comparison value to obtain a first comparison result, and determining an output result according to the first comparison result; when the output result is a second numerical value, starting an overexcitation limiting inverse time limit adjustment so as to reduce the excitation current to a first preset value.

Description

technical field [0001] The invention relates to the field of excitation regulation, in particular to an optimization method and system for overexcitation limitation of an excitation regulator. Background technique [0002] Insufficient voltage and reactive power supporting capacity under the impact of severe faults may induce system voltage instability accidents. During the medium and long-term fault process, the action behavior of generator Over Excitation Limiter (OEL, Over Excitation Limiter) plays an important role in maintaining the stability of the power grid and preventing large-scale blackout accidents. [0003] At present, a lot of research has been carried out on the influence of over-excitation limitation on chain blackout accidents and the cooperation of over-excitation protection. The inverse time in the existing design has nothing to do with the initial value of the excitation current, but only with the value of the excitation current when the excitation curre...

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Problems solved by technology

The inverse time in the existing design has nothing to do with the initial value of the excitation current, but only with the value of the excitation current when the excitation current is strong. As a result, when the initial excitation current of the generator is lower than the rated excitation current, the strong excitation capacity of the generator or the overshoot The current potential capacity is much larger than the current conventional excitation design, which cannot give full play to the support ability of the unit to the grid; when the initial excitation current of the generator is higher than the rated excitation current, the strong excitation capacity of the generator is smaller than the current conventional excitation design, which may endanger the safety of the crew

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