An automatic self-synchronization system for hydro-generators of small hydropower stations

Abstract

The invention relates to an automatic self-synchronization system for a hydro-generator of a small hydropower station, comprising an automatic self-synchronization wiring circuit, a speed relay circuit and a synchronous closing circuit of a generator outlet circuit breaker; the automatic self-synchronization wiring circuit adopts a speed relay to perform automatic self-synchronization Wiring control. Compared with the automatic self-synchronization wiring using the differential frequency relay, the present invention adopts the automatic self-synchronizing wiring of the speed relay, which can shorten the start-up time. When there is no voltage on the generator bus, the generator circuit breaker can be automatically closed; when the system frequency changes, the generator can be switched on with a large slip.

Description

technical field [0001] The invention relates to the technical field of hydropower stations, in particular to an automatic self-synchronization system for a hydro-generator of a small hydropower station. Background technique [0002] At present, the self-synchronized paralleling of hydro-generators in small hydropower stations is to put the generators with no excitation and the speed close to the synchronous speed into the system and add excitation immediately (or after a certain period of time), so that the generators are automatically pulled into synchronization in a very short time. . At present, the hydro-generator of small hydropower station mainly adopts automatic self-synchronization wiring of differential frequency relay, which has the following technical problems: [0003] 1. The generator cannot be automatically connected to the bus without voltage; [0004] 2. When the slip is greater than 4%, the difference frequency relay cannot work correctly; [0005] 3. In ...

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Problems solved by technology

[0003] 1. The generator cannot be automatically connected to the bus without voltage;

[0004] 2. When the slip is greater than 4%, the differential frequency relay cannot work correctly;

[0005] 3. In case of an accident, the system frequency decreases, the generator may close at an acceleration greater than normal or the differential frequency relay refuses to operate;

[0006] 4. The differential frequency relay is difficult to adjust. After adjustment, the characteristics are easy to change, and the shaft tip is easy to wear, and sometimes sticking occurs, causing the generator to be turned before the circuit breaker is put into operation, which in turn causes a large damage to the system and the generator. impact;

[0007] 5. The wiring of the differential frequency relay itself is related to the residual voltage, and it is often refused to operate due to the influence of the parasitic current of the circuit contact resistance and the blown fuse of the secondary side of the voltage transformer.

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