JPS63190529A - Generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to the startup of a thermal or nuclear power plant, and in particular to reliable supply of power to auxiliary motors during a total power outage of the power plant. The present invention relates to a power generation device.

(Prior art) In the construction of a tit source for a thermal or nuclear power plant,
There are other power plants installed nearby.

If the power for the auxiliary motors that require operation at the time of startup of the thermal or nuclear power plant can be easily obtained via power transmission lines, the voltage is stepped down at the startup transformer through the breaker at the substation, and the power is supplied to the auxiliary motors. can be supplied. When startup is complete, power generated in the relevant thermal or nuclear power plant is supplied to these auxiliary motors via an in-station transformer.

In addition, in the event of an accidental shutdown or normal shutdown of a thermal or nuclear power plant, it is impossible to immediately stop these auxiliary motors.
To prevent the accident from spreading, a safe shutdown operation is performed after the power is switched to the starting transformer to secure power to the auxiliary motors, just as at the time of startup.

As is clear from the above explanation, in thermal or nuclear power plants, the power supply is configured so that power for the auxiliary motors is supplied from other nearby power plants, whether at startup or shutdown. . However, in recent years, thermal or nuclear power plants have been constructed in remote areas due to location requirements, and the power transmission lines have become long distances, making it difficult to secure power from other power plants when starting up or shutting down. However, there are problems with the reliability of the power supply.

Therefore, in order to improve the reliability of this power source, for thermal or nuclear power plants that are located in remote locations or where power supply from other power plants is insufficiently secured, a total power outage is required at the relevant thermal or nuclear power plant. Sometimes, a gas turbine or diesel power generator is provided exclusively for black start without relying on these external power sources. The power supply configuration in this case is shown in FIG. In FIG. 2, 2 is a generator of the above-mentioned black start gas turbine or diesel generator 1 Generator 2 is connected to a breaker 14 of a bulk bus 5, which is a substation, via a step-up transformer 24. .

If there is a total power outage when a thermal or nuclear power plant is started or stopped, the voltage is stepped down by the start transformer 15 through the breaker 20 of the substation, and power is supplied to the auxiliary motor group 12. Also, while the thermal or nuclear power plant in question is in operation, will this black start gas turbine or diesel generator be used? The tt device can be operated to supply power from the F4 generator 2 through the step-up transformer 24 and through the transmission line breaker of the substation to the peak load.

(Problems to be Solved by the Invention) As described above, in order to secure the power supply for auxiliary motors in the event of a total power outage at the time of starting or stopping a thermal or nuclear power plant, a black start gas turbine or A diesel generator is installed, and this generator is connected to the substation via a step-up transformer. However, in this way, the generator of the black start gas turbine or diesel power generator is once connected to the substation via the step-up transformer.

Furthermore, since power is supplied to the auxiliary motors of the relevant power generation plant via the starting transformer, a large starting current flows when starting the large capacity auxiliary motors, and the step-up transformer and starting transformer This causes a large voltage drop due to the impedance of the two transformers, and in some cases, it may become impossible to start the auxiliary motor.

The present invention has been made to solve the above-mentioned problems, and the object is to start a large-capacity auxiliary motor by a black-start gas turbine or diesel power generator during a total power outage in a thermal or nuclear power plant. 6 [Configuration of the Invention] (Means for Solving the Problems) The power source configuration of the thermal or nuclear power plant of the present invention during a total power outage is By directly connecting the generator of the starting gas turbine or diesel generator to the starting transformer, the large-capacity auxiliary motor can be supplied with power through only one transformer. It is constructed as something that does.

(Function) By directly connecting the generator of a black start gas turbine or diesel generator to the starting transformer, power is supplied to the auxiliary motor group of a thermal or nuclear power plant via only one starting transformer. Therefore, the impedance of the transformer can be reduced, and the voltage drop during startup of the large-capacity auxiliary motor can be reduced.

Also, during operation of a thermal or nuclear power plant, at the point where the generator and starting transformer of the black start gas turbine or diesel power generator are connected.

By connecting an interconnection transformer and passing through a substation breaker, the power of the generator can also be used as a peak load power supply.

(Example) Fig. 1 shows an example of the configuration when a black start gas turbine or diesel power generation device is installed in a thermal or nuclear power plant for carrying out the present invention. The turbine generator 2 of the power generation plant is a generator of a gas turbine for black start or a diesel power generator. The power generation ja1 is connected to a collective bus 5 of a substation via a step-up transformer 3 and a breaker 4.

A branch circuit 8 is connected to the collective bus 5 from the main circuit of the generator 1, which is connected to the transmission line 7 via the transmission line breaker 6, to the station auxiliary equipment bus 11 via the station transformer 9 and the breaker 1o.
is connected to. Auxiliary motor group 1 is installed on the in-house auxiliary equipment bus IJ.
2 are connected via a circuit breaker 13.

The generator 2 is connected to the 8 dynamic transformer 1 via the generator breaker 14.
5 and an interconnection transformer 16. Further, the generator breaker 14 is connected to an auxiliary equipment motherboard 4119 via an in-station transformer 17 and a breaker 18 for supplying power to the auxiliary equipment of the black start generator.

The interconnection transformer 1G is connected to the bulk mother fi5 via the breaker 20.
It is connected to the. In addition, the starting transformer 15 is a breaker 21
It is connected to the common auxiliary machine bus 22 via. The in-house auxiliary equipment bus fill and the common auxiliary equipment bus 22 are connected via a busbar connection breaker 23.

In a thermal or nuclear power plant configured in this way, in the event of a total power outage, the power of the generator 2 of the black start gas turbine or diesel power generator is transferred to the starting transformer 1.
5 to the auxiliary motor group 12 of the plant.

Further, while the plant is in operation, power from the generator 2 is transmitted via the interconnection transformer 16 and the power transmission line 7 for peak load use.

The method of operating this plant will be explained in more detail below. First, when starting up the plant, in the case of a total power outage in the plant, power cannot be supplied from the power transmission line 7, so even if the circuit breakers 6゜20, 21, 23, 13 are closed, the auxiliary motor group 12 cannot be started, so we start the black start generator, close the breaker 14 to cut off the power from generator 1 and 2, and connect the starting transformer 15. Breaker 2
1.23.13 are sequentially closed and power is supplied to the auxiliary motor group 12.
6 Next, when the start-up of the plant is completed and the generator 1 is able to generate electricity, the circuit breakers 4 and 6 are closed via the step-up transformer 3 to transmit power to the power transmission line 7, and the breaker is disconnected. By synchronously turning on the transformer 10, power is supplied to the own auxiliary motor group 12 through the in-station transformer 9. Thereafter, after turning off the breaker 21, the black start power generation device is stopped by opening the breaker f114. In this state, the plant can be operated normally.

Also, during normal operation of the plant, if the load side of the system requires power that exceeds the plant output, that is, there is a peak load request, the breaker 20 is closed while the breaker 21 is open. By starting the black start power generating device and synchronously turning on the breaker 14, the power generated by this power generating device can be supplied as peak load power.

〔Effect of the invention〕

As described in detail above, according to the present invention, the auxiliary power of the auxiliary motor group of the plant is supplied to the generator of the black start generator through only one starting transformer. It is possible to reduce the impedance between the generator and the auxiliary motor, reduce the voltage drop when starting the large capacity auxiliary motor, and connect the generator of the black start generator directly to the auxiliary motor bus. This eliminates the increase in breaking capacity when operating in parallel with the plant's in-house transformer.
The reliability of the power supply for the auxiliary motor is improved.

[Brief explanation of the drawing]

FIG. 1 is a single-line diagram of a configuration example of a thermal or nuclear power plant implementing the power source configuration of the present invention, and FIG. 2 is a conventional single-line diagram. 1... Turbine generator 2... Auxiliary generator 3...
Step-up transformer 12... Auxiliary motor group 15... Starting transformer 16... Interconnection transformer agent Patent attorney
Noriyuki Noriyuki Yudo Hirofumi Mitsumata

Claims (1)

[Claims] In the event of a total power outage in a thermal or nuclear power plant, starting the auxiliary motor group at the power source of a black start gas turbine or diesel power generator installed to supply power to the auxiliary motor group for starting the power plant. A power generating device characterized in that power can be supplied from the power source only through a starting transformer.