Self-excited synchronous generator alternating current excitation initiating circuit

Abstract

The invention relates to a self-excited synchronous generator alternating current excitation initiating circuit, which comprises a diode rectifier bridge excitation initiating circuit with an alternating current lateral contactor and is connected with the two ends of a rotor of a generator in parallel. The self-excited synchronous generator alternating current excitation initiating circuit is characterized in that the diode rectifier bridge output side of the excitation initiating circuit is connected with a resistor in parallel. In the invention, when the generator starts and builds up a voltage, a resistor connected with the diode rectifier bridge output side of the excitation initiating circuit in parallel is connected to the excitation initiating circuit to produce an afterflow in thediode, the resistor, at the same time, serves as a load of a silicon controlled rectifier of an excitation rectifier device in an excitation initiating process to allow the output currents of both a silicon controlled element and a diode element in the excitation rectifier device to surpass a maintenance current and a latching current, and thus, the continuous conduction of the silicon controlledrectifier in an excitation initiating process is ensured and the reliable excitation initiation of the generator is realized; and when the excitation initiation of the generator is finished, the afterflow resistor and the excitation initiating circuit stop operating under the control of a regulator, so the safety of the excitation initiating circuit is ensured.

Description

technical field [0001] The invention relates to an AC excitation circuit of a self-excited synchronous generator. Background technique [0002] The restart of synchronous generators is very frequent. For example, after a period of operation of synchronous generators, it is necessary to stop for maintenance to ensure the safety of generator sets during long-term operation; because the power load has different needs in different seasons, when the load When it is reduced, the power grid will also require some generators to be disconnected; the hydro-generator is a type of synchronous generator, which undertakes the functions of frequency modulation and peak regulation, and its startup and shutdown times are relatively frequent. When a self-excited synchronous generator is used, when the generator unit starts up again to generate electricity, it must first start excitation and build up pressure. It can be seen that the reliable and fast excitation of the generator is very import...

AI Technical Summary

Problems solved by technology

For a generator with a large rotor inductance, the large rotor inductance may affect the working state of the thyristor element of the rectification device of the excitation system during the excitation process, that is, the thyristor element cannot be continuously conducted during the excitation process, so that The terminal voltage of the generator is too low, so that after the excitation process is over, the machine terminal voltage is too low, greatly reducing the speed of excitation or making the excitation regulator unable to trigger the thyristor of the rectifier device, which will eventually lead to failure of generator excitation

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