Device and method for inputting black-start grid-connection releasing signal into excitation and speed regulator system

Abstract

The invention discloses a device for inputting a black-start grid-connected signal to an excitation and speed regulator system. The device comprises a battery module, a circuit breaker position inputterminal, a relay module, a circuit breaker position output terminal and a release switch; the device controls the working state of a relay in a relay module through a release switch, a grid-connectedcircuit breaker closing position signal is transmitted to a grid-connected circuit breaker closing signal input channel of an excitation system or a speed regulation system through a common end and anormally closed contact of the relay module, and the release switch is operated to a release position; when the grid-connected circuit breaker is switched on, a normally-closed contact of a relay inthe relay module is disconnected, a switching-on position signal of the grid-connected circuit breaker cannot be input into the excitation system or the speed regulation system, the release switch isoperated to a normal operation position, and the switching-on position signal of the grid-connected circuit breaker can be input into the excitation system or the speed regulation system; the releaseswitch is used for driving the relay module to realize switching between two working modes of normal operation and black start of the unit, so the equipment body safety of an excitation system and a speed regulation system is facilitated, and field use and operation are facilitated; the black-start grid-connection releasing signal is released through simple operation of a worker, so black start can be smoothly carried out, the defects of a conventional manual releasing mode are overcome, and the equipment state adjusting efficiency before black start is improved.

Description

technical field [0001] The invention belongs to the technical field of black start, and in particular relates to a device and a method for inputting a black start release grid connection signal to an excitation and governor system. Background technique [0002] With the black start of the power system becoming more and more important in the power system, the black start has been paid more and more attention by various power generation companies, power grids, and energy regulatory agencies in recent years. And less, not to say that there will be no major blackouts on the grid. In today's world, various power generation equipment is developing towards informatization and big data. Almost all units have been transformed into digital control. The warning that any programmed automatic device may have unknown technical loopholes, these problems highlight the importance of black boot in a country. The power plant has different control methods between normal operation and black st...

AI Technical Summary

Problems solved by technology

In today's world, various power generation equipment is developing towards informatization and big data. Almost all units have been transformed into digital control. Warning that any programmed automatic device may have unknown technical vulnerabilities, these issues highlight the importance of black boot in a country

The power plant has different control methods between normal operation and black start. How to quickly switch between the two methods after a power outage can save valuable operating time for black start. When the grid-connected circuit breaker is in the closed position, the excitation system And the speed control system considers that the generator has been connected to the grid, and the control logic is replaced in the grid-connected operation logic mode. In the case that the closing position of the grid-connected circuit breaker is not released, the excitation and speed control system of the generator with transformer test are black started The function of constant speed and zero-start voltage boost cannot be realized, which limits the zero-start voltage boost function of the generator with main transformer and line, and the governor cannot realize normal automatic start-up

At present, the known method of removing the grid-connected signal from the black start and inputting the excitation and governor system is to manually de-excite or take out the corresponding line from the governor system, and the same work needs to be repeated every time the black start is performed, which brings a lot of trouble to the site. It is inconvenient, and at the same time, it is very likely that the fixed end of the terminal will be loose when the connection is restored, resulting in poor contact, leaving hidden dangers for normal operation, which is not conducive to equipment maintenance and operation

Images