Flexible electric braking exciting loop of self-exciting hydraulic generator and exciting method thereof

Abstract

The invention discloses a flexible electric braking exciting loop of a self-exciting hydraulic generator and an exciting method thereof. The flexible electric braking exciting loop of the self-exciting hydraulic generator comprises a diode rectifier bridge exciting loop with an alternating-current side contactor and a direct-current side contactor, and the diode rectifier bridge exciting loop is connected in parallel at two ends of a rotor of the generator. The flexible electric braking exciting loop of the self-exciting hydraulic generator is characterized in that a diode rectifier bridge output side of the diode rectifier bridge exciting loop is connected in parallel with a resistor. The exciting loop provided by the invention not only can be used for carrying out alternating-current control excitation when the generator is subjected to self-exciting electricity generation, but also can be used for the excitation when the generator is subjected to flexible braking startup simultaneously.

Description

technical field [0001] The invention relates to a self-excited hydraulic generator flexible electric brake excitation circuit and an excitation method thereof, belonging to the technical field of power system generators. Background technique [0002] Hydrogenerators generally undertake the functions of frequency regulation, peak regulation and emergency backup in the power grid, which makes the units start and stop frequently. When the self-excited synchronous hydro-generator is used, when the generator unit starts to generate electricity again, it must first start the excitation and build up the pressure. Therefore, the reliable and fast excitation of the generator is very important for the restart of the generator. When the generator set is shut down, due to the huge moment of inertia of the large-scale hydro-generator set, the traditional single mechanical braking method is far from meeting the requirements of the modern control operation mode. way of braking. [0003] ...

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, causing the The terminal voltage of the generator is too low, so that after the excitation process is completed, the terminal voltage of the generator is too low, and even the terminal voltage cannot be established.

When the generator is stopped and electrically braked, the electric brake power is directly applied to the anode of the thyristor. Due to the large inductance of the generator rotor, the thyristor element of the current device cannot be continuously conducted, and the magnetic field cannot be established, which eventually causes the generator failure of electrical braking

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