JPH0136348B2 - - Google Patents

Description

[Detailed description of the invention] To provide a simple and economical starting method for a pumped storage power plant by devising a starting control circuit in a low-pressure synchronous pumped storage power plant that uses both a synchronous starting method and a thyristor starting method. Regarding things. A conventional device will be explained with reference to FIG.

FIG. 1 is an example of a conventional low-pressure synchronous pumped storage power plant that uses both the thyristor starting method and the synchronous starting method. The same reference numerals in the figures indicate the same or equivalent products.

1 is a generator motor directly connected to a reversible pump turbine (not shown); 2 is a main transformer; 3 is a generator motor 1 that rotates reversibly during power generation and pumping; therefore, a phase switch is used to change the direction of phase rotation. A disconnector, 4G is a generator side disconnector, 4L is a system side disconnector, 5 is a disconnector, 6 is a synchronous start disconnector, and 7 is a thyristor start disconnector. 8-1, 8-2 are disconnectors for the starting transformer, 9 is a disconnector, 10 is a starting transformer,
11 is a reactor on the AC input side, 12 is a disconnector for the thyristor starter, 13 is a breaker, 14 is a converter, 15 is a DC reactor, 16 is an inverter, 17 is a reactor on the AC output side, 18 is a breaker, 19 is a disconnector, and 20 is a cable head.

Next, the operation will be explained. In the case of synchronous start, when starting Unit 1 with Unit 2, close the synchronous start disconnector 6 of Unit 2, the generator switch 4G, and
The phase switching disconnector 3 of the No. 1 machine is opened, the phase switching disconnector 3 of the No. 1 machine is closed in the pumping (P) direction, and the thyristor starting disconnector 7 of the No. 1 machine is kept open. Then, the generator motor 1 of the No. 2 unit is made to generate electricity, and power is supplied through the generator motor disconnector 4G of the No. 2 generator, the synchronous start disconnector 6, and the thyristor start disconnector 7 of the No. 1 unit, and the power is supplied to the generator motor of the No. 1 unit. Gradually increase the speed of the No. 1 motor, synchronize with the grid, turn on the No. 1 generator and disconnect 4G, and then
Unit generator switch 4G, synchronous start switch 6
Then, the thyristor starting disconnector 7 of the No. 1 unit is opened, and the No. 1 unit enters pumping operation. When starting No. 2 with No. 1, synchronous starting can be performed in the same manner. Next, the case of thyristor starting will be explained. When starting Unit 1, open the synchronous start disconnector 6 of Unit 1, turn on the thyristor start disconnector 7, and open the synchronous start disconnector 6 and thyristor start disconnector 7 of Unit 2. . The pumping water (P) side of the phase switching disconnector 3 of Unit 1 is turned on, and the disconnector 5 is also turned on.

Then, the starting transformer disconnector 8-1, the shield disconnector 9, the thyristor starter disconnector 12, the shield disconnectors 13, 18, and the disconnector 19 are turned on, and the inverter 16 and converter 14 are used to gradually turn on the No. 1 unit. Increase the frequency supplied to the generator motor 1, synchronize with the grid side, turn on the generator switch 4G, open the switch breaker 18 and then open the thyristor start disconnect switch 7, and pump water by starting the thyristor. Start driving. These conventional starting sequences are shown in FIG. These conventional methods usually use thyristor starting,
In the unlikely event that a failure occurs in the thyristor starting device and the device cannot be used, the synchronous starting method is used as a countermeasure when it is desired to put even just one unit into pumping operation. For this purpose, a circuit shown in FIG. 1 is configured to perform synchronous starting. However, in the conventional starting method of the generator motor during pumped storage operation in a pumped storage power plant, a disconnector 6 was installed in the main circuit for thyristor starting for synchronous starting, which is rarely used. The problem was that it became complicated.

The present invention was made in order to solve the above problems, and the main circuit is devised so that the main circuit for normal operation can also be used for synchronous starting without providing a dedicated synchronous starting bus or disconnector. The objective is to obtain a starting method for a pumped storage power plant that simplifies the circuit and improves reliability.

An embodiment of the present invention will be described below based on the drawings. That is, the main circuit of the present invention omits the disconnector 6 and its synchronous start bus shown in FIG.
Thyristor starting is the same as the conventional method,
Since the synchronous starting method is significantly different from the conventional method, the synchronous starting sequence according to the present invention will be explained below with reference to FIG.

For example, when starting Unit 1 with Unit 2, first open the thyristor starting disconnector 7 of Unit 2, open the starting transformer disconnector 8-1, and then open the generator disconnector 4G of Unit 2. and closes the power generation (G) side of the phase switching disconnector 3. Further, the thyristor starting disconnector 7 of the No. 1 unit is opened, and the pumping water (P) side of the generator switch 4G and the phase switching disconnector 3 of the No. 1 unit are closed. After that, the generator motor 1 of the No. 2 unit is started to generate electricity, and the generator motor 1 of the No. 2 unit is disconnected.
G, the power generation (G) side of the phase switching disconnector 3, the pumping (P) side of the phase switching disconnector 3 of the main transformer and Unit 1, and the generator motor 1 of Unit 1 through the generator and disconnector 4G. supply Therefore, the generator motor 1 of the first machine rotates as an electric motor and gradually increases its speed.
Thereafter, in synchronization with the grid side, the grid-side power switch 4L is turned on, and then the generator switch 4G of the No. 2 generator is opened, and the generator motor 1 of the No. 1 machine starts pumping operation. Similarly, when starting the second machine with the first machine, a synchronous start is performed in the same manner.

In this way, in this example, since the main circuit is used for synchronous starting, it is not possible to receive power within the station from the bus bar, and it is necessary to receive power within the station from other units or feeders, but this is effective for a short period of time at the time of startup. Therefore, there is no practical problem.

As described above, according to the present invention, since the main circuit is used for synchronous starting, it is possible to obtain a starting device for a pumped storage power plant that has a simple configuration of the main circuit and is easy to maintain.

[Brief explanation of drawings]

Fig. 1 is an example of a single-line connection diagram when a conventional method of synchronous starting and thyristor starting are used together, Fig. 2 is an example of a starting block diagram using a conventional starting system, and Fig. 3 is an example of a starting method according to the present invention. An example of a startup block diagram is shown. In the figure, 1 is a generator motor, 3 is a phase switching disconnector, 4G, 4L isolator, 5 is a disconnector, 6 is a synchronous start disconnector, 7 is a thyristor start disconnector,
8 is a disconnector for the starting thyristor, 9 is a disconnector, 1
0 is a starting transformer, 11 is an AC input side reactor, 12 is a thyristor starter disconnector, 13 is a breaker, 14 is a converter, 15 is a DC reactor, 16 is an inverter, 17 is an AC output side reactor, 18 is a disconnector, 19 is a disconnector, and 20 is a cable head.

Claims (1)

[Claims] 1. A first generator switch provided in the main circuit of the first generator, connected between the first generator switch and a grid-side switch, A first phase switching disconnector that switches the phase rotation direction between power generation and pumping of the first generator; a second generator disconnector installed in the main circuit of the second generator; a second phase switching disconnector that is connected between the first generator and the grid-side disconnector, and switches the phase rotation direction between the second generator when generating electricity and when pumping; the first generator and the first generator; a first thyristor starting device disconnector connected between the connection point of the generator and the disconnector and the thyristor starter, the connection point of the second generator and the second generator and the disconnector, and the thyristor starter; In a method for starting a pumped storage power plant that uses a synchronous starting method and a thyristor starting method in combination, the first generator is started using the thyristor starting method. In this case, the thyristor is started with the first thyristor starting device disconnector and the system side disconnector closed, the first generator disconnector opened, and the first phase switching disconnector closed in the pumping direction. Supplying power from the device to the first generator through the first thyristor starter disconnector to increase the speed, and disconnecting the first generator and the disconnector in a state where the first generator and the grid are synchronized. After closing and connecting the first generator to the grid, the first thyristor starting disconnector is opened to start pumping operation of the first generator, and the second generator starts the first generator synchronously. In this case, open the first and second thyristor starter disconnectors and the grid-side disconnectors, close the first and second generator disconnectors, and turn off the first phase switching disconnector to pump water. direction, the second generator is caused to generate electricity with the second phase switching disconnector closed in the direction of generation, and the second generator and the disconnector are closed.
Power was supplied to the first generator through the second phase switching disconnect switch, the first phase switching disconnect switch, and the first generator switch to increase the speed and synchronize the first generator with the grid. 1. A method for starting a pumped storage power plant, comprising: closing a grid-side disconnector, connecting a first generator to a grid, and starting pumping operation of the first generator.