Excitation method and related device for an excitation system

Abstract

The invention discloses an excitation method of an excitation system; the excitation method comprises the following steps of monitoring the generator terminal voltage of a generator and judging whether the generator terminal voltage is smaller than the rated generator terminal voltage of a preset ratio or not; if so, judging whether the excitation system meets a de-excitation system condition or not after the first preset duration when the monitoring system issues an excitation system input command; if the de-excitation system condition is met, sending an excitation system cutting-off instruction to enable the excitation system to exit; judging whether the excitation system meets an input excitation system condition or not after the second preset duration when the monitoring system issuesan excitation system input command, wherein the second preset duration is longer than the first preset duration; and if the input excitation system condition is met, inputting the excitation system for performing excitation of the excitation system. According to the method, the running stability of the excitation system can be effectively improved, and the starting success rate of the unit can beimproved. The invention further discloses an excitation device of the excitation system, the excitation system and a computer readable storage medium which all have the technical effects.

Description

Technical field[0001]This application relates to the field of electric power technology, and in particular to an excitation system excitation method; also relates to an excitation system excitation device, an excitation system and a computer-readable storage medium.Background technique[0002]With the development of power construction, the power system has entered the stage of large networks, high voltages, and large units. The stability of the operation of large-capacity units is essential to the stability and safety of the overall grid. Among them, the excitation system of the generator set has the greatest impact on generator stability. The excitation system is not only a guarantee for stable operation of the unit, but also a lever for reactive power and voltage regulation in the entire grid. At present, for the UNITROL5000 excitation system, it uses the measurement of the generator terminal voltage and the excitation synchronization voltage as the excitation condition, and if any ...

AI Technical Summary

Problems solved by technology

At present, for the UNITROL5000 excitation system, it uses the generator terminal voltage and the excitation synchronous voltage as the excitation condition, and if there is an instantaneous voltage disturbance in any of the measurement circuits during excitation, the measurement circuit will be measured due to the voltage disturbance. If the voltage value exceeds the excitation cut-off voltage, the excitation system will mistakenly believe that the excitation is successful, and then enter the logic program of normal soft excitation, but during this period, the sampling values ​​of the generator terminal voltage and excitation current are all zero, After a certain period of time (usually 12 seconds), the soft excitation ends, and the excitation system will falsely report the action of over-excitation limit and rotor inverse time-limit over-current limitation, which will cause the excitation system to fail to activate, but no excitation failure signal will be reported, which will seriously affect the The operation stability of the excitation system and the success rate of unit startup

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