A method and device for collecting and processing synchronous signals of an excitation power supply

Abstract

The present invention provides an excitation power synchronization signal collection and processing method and apparatus. The method comprises the steps of collecting a synchronization voltage signal and a generator PT signal simultaneously; determining phase sequences, frequencies and phase values of the synchronization voltage signal and the generator PT signal according to the synchronization voltage signal and the generator PT signal; and determining an excitation power synchronization signal reference source according to the phase sequences, frequencies and phase values of the synchronization voltage signal and the generator PT signal. Through adoption of the method and apparatus, redundant intelligence of a synchronization signal of rectification of the controllable silicon rectification bridge is realized, the fault tolerance rate is higher, and related running accidents of the excitation system and the generator caused by synchronization loop sampling abnormality are reduced.

Description

technical field [0001] The invention relates to power control technology, in particular to a method and device for collecting and processing synchronous signals of an excitation power supply. Background technique [0002] At present, the excitation system of large and medium-sized generators generally adopts the thyristor static excitation method, and the three-phase excitation power is taken from the generator end, that is, the self-shunt excitation system. A key link in the working process of the excitation system is that the excitation adjustment device collects the synchronous signal of the three-phase excitation power supply. The excitation system has very strict requirements on the sampling of the synchronous signal, and the phase sequence, frequency, and phase are required to be within the normal operating range, otherwise it will cause The thyristor trigger pulse issued by the regulating device is not synchronized with the excitation power supply, and the rectificati...

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Problems solved by technology

[0004] In the prior art, the signal source for collecting the synchronous signal of the three-phase excitation power supply is single, and only the signal exit and the excitation exit can be performed in the event of a failure. The fault tolerance rate is low, and the reliability of the excitation system operation is reduced.

The disadvantages of the existing synchronous signal acquisition and processing methods mainly include: 1. The synchronous voltage signal method, the signal is taken from the AC power supply side, which belongs to the main circuit part, and has high requirements for the working reliability and insulation withstand voltage of the synchronous voltage device

The copper busbar cable connected to it has a large current during operation. If the connection is loose, the temperature will rise, and there are certain safety hazards.

In a certain site, there was an accident that the connected anode voltage signal line was blown due to the looseness of the knife switch, the large heat generated at the loose part, and the temperature was too high.

2. The generator PT signal method is used. The signal is taken from the secondary side of the generator terminal voltage transformer PT. The angle difference setting is complicated and difficult to debug.

If there are faults such as voltage transformer PT disconnection, it will also affect the normal operation of PT synchronization.

Both of the above two methods have the problem of low fault tolerance rate. When the external circuit failure causes the synchronization signal sampling error, it cannot perform intelligent processing and channel switching. The overall reliability of the excitation system is improved

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