JPH0425436B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electric drive device for a high-speed, large-capacity compressor used in a gas pumping station of a gas pipeline, a liquefied gas plant, or the like.

[Technical background of the invention and its problems]

gas pipeline gas pumping station,
In liquefied gas plants, etc., there are multiple compressors (usually two to several) with a large capacity of 10,000 HP to tens of thousands of HP and high speed (4,000 to 10,000 revolutions/min).
used. The driving machine for this compressor is:
Conventionally, mechanically driven gas turbines or steam turbines have been used in most cases.

FIG. 1 shows the above-mentioned conventional direct drive system for a compressor using a gas turbine, where 1 represents a mechanically driven gas turbine and 2 represents a high speed compressor.
Furthermore, Fig. 2 shows a conventional direct drive system for a compressor using a steam turbine, where 3 represents a steam generation boiler and 4 represents a steam turbine.The reason why such a drive machine was used in the past is that This is because gas turbines and steam turbines were the only capacity driving machines available. Electric drives were used in a small number of cases, but electric drives cannot achieve high speeds above 3,600 RPM even in 60 Hz areas with commercial electric drives, and a speed increasing gear is required to achieve 4,000 to 10,000 RPM, making maintenance and reliability difficult. I had a problem with this.

In addition, the location where such a plant is installed is
It was a place where it was difficult to obtain large amounts of commercial power, so electric drives were not widely used. However, when gas turbines are used for mechanical drive, they have disadvantages such as the need to generate a considerable amount of torque from the start, making the mechanism complicated, expensive, and requiring a great deal of cost, time, and manpower for maintenance. .
Furthermore, the steam turbine also requires a boiler, which poses problems such as being limited by the distance between the boiler and multiple steam turbines, and requiring labor to start, stop, and maintain the boiler.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and is designed to provide multiple large-capacity, high-speed compressors in areas without electricity.
It is an object of the present invention to provide an electric drive device for a high-speed, large-capacity compressor that does not have the above-mentioned drawbacks and can be directly electrically driven without using a complicated mechanically driven gas turbine and without a speed increasing gear.

[Summary of the Invention] The present invention first applies to high-speed gas turbines (4000~
10,000 RPM) and drive a two-pole high frequency generator to generate power at a frequency of several tens to hundreds of Hz. At this time, the gas turbine may be used for no-load startup, and there is no need to generate large torque at startup. Next, a two-pole synchronous motor or a two-pole induction motor is driven by the high-frequency power source. This makes it possible to drive a high speed compressor without a speed increasing gear. However, when starting, it is difficult to start such a high-speed, large-capacity motor by itself, so a semiconductor starting device such as a thyristor is installed in series with the high-frequency generator and in parallel with the motor, and the starting device sequentially starts the motor. Start the electric motor. The present invention thus achieves the above object.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows an example of an embodiment of the present invention, in which 5 is a high-speed gas turbine for a power generator, 6 is a high-frequency generator that is directly connected to this gas turbine and generates a frequency of several tens to a hundred and several tens of Hz, and 7 is a high-speed gas turbine for a power generator. 8 is a high-speed motor driven by a high-frequency power supply; 2 is a high-speed compressor directly connected to the high-speed motor; and 9 is a starter for starting the high-speed motor 2. Fig. 4 shows details of the starting device 9. If the high-speed motor 8 is a synchronous motor, a load commutation type inverter as shown in this figure can be used to start the motor from a standstill to a high speed of several thousand revolutions. I can do it. One set of this starting device is sufficient because the electric motors are sequentially started one by one by switching the breaker.

FIG. 5 shows another embodiment of the starting device 9, in which a forced commutation type inverter is used when the high speed motor 8 is an induction type motor. Although this embodiment is an example of a voltage-type thyristor inverter, an inverter using a current-source inverter self-extinguishing element (GTO) or the like may also be used.

In addition, in FIG. 3, the high-speed gas turbine 5 for the generator is directly connected to the high-frequency generator, and is connected to the commercial frequency 2
Generates ~3 times as much high frequency power. A high-speed electric motor driven by this high-frequency power source rotates at a high speed of several thousand revolutions without a speed-increasing gear, and can directly drive a high-voltage, large-capacity compressor. A starting device is used to start the electric motor.

Thus, according to this embodiment, the compressor can be easily driven directly by a high-speed electric motor even in a place where there is no electric power, and the maintenance peculiar to electric drive can be easily performed.
It has advantages such as easy start and stop operation, and can be driven without a gear, improving efficiency and reliability. Furthermore, since the number of gas turbines is reduced and the mechanism is simple, it is much easier to maintain than many gas turbines for driving the compressor. In addition, in a compressor suspension station, a power source for an auxiliary motor or the like is required in addition to the main compressor drive, but this system does not require separate power supply equipment and is advantageous in terms of cost.

Next, other embodiments of the present invention will be described. Although the embodiment shown in FIG. 3 is an example driven by a gas turbine, it goes without saying that this may be replaced with a boiler and a steam turbine. Further, as a method for starting the electric motor, reactor starting, condor starting, etc. can be adopted if the heat capacity of the electric motor allows. Furthermore, although the explanation so far has been made assuming a compressor as the load machine, it is of course not limited to the compressor if it is a load that requires high speed, such as a pump or blower.

〔Effect of the invention〕

As explained in detail above, according to the present invention, multiple large high-capacity, high-speed compressors can be driven directly by electric power without using a complicated mechanical drive gas turbine and without a speed increasing gear in areas where there is no power source. Therefore, it is possible to provide an effective electric drive device for a high-speed, large-capacity compressor that has low construction costs, good maintainability and operability.

[Brief explanation of drawings]

Fig. 1 is a diagram of a conventional direct drive system for a compressor by a gas turbine, Fig. 2 is a diagram of a direct drive system for a compressor by a conventional steam turbine, Fig. 3 is a configuration diagram showing an embodiment of the present invention, and Fig. 4 5 is a configuration diagram of the electric motor starting device, and FIG. 5 is another configuration diagram of the electric motor starting device. 1... Gas turbine for mechanical drive, 2... High speed compressor, 3... Boiler for steam generation, 4...
Steam turbine, 5... gas turbine for power generation,
6... High frequency generator, 7... Line breaker, 8... High speed engine, 9... Starting device, 10... Reactor, 11... Rectifier (variable voltage), 12... Load commutation type inverter , 13... Rectifier (constant voltage),
14...Capacitor, 15...Forced commutation type inverter.

Claims (1)

[Claims] 1. A high-speed gas turbine, a high-frequency generator driven by the gas turbine, and multiple high-speed electric motors driven by the high-frequency generator as a power source,
An electric drive device for a high-speed, large-capacity compressor comprising a semiconductor starter device installed in parallel with the electric motor to start the electric motor.