JPS6056380B2 - Power generation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power generation facility equipped with a plurality of power generation units each including a drive source and a generator.

Generally, power generation equipment using small-capacity gas turbines is less efficient than diesel generators. For this reason, the exhaust gas from the gas turbine is used to rotate the steam turbine,
Power generation equipment with improved efficiency has been developed by driving a generator with this steam turbine. At this time, since the generator driven by the gas turbine is a synchronous generator, the rotation speed must be lowered, so the rotation speed of the high-speed gas turbine is reduced to rotate the synchronous generator. There is a need. For this reason, an expensive speed reducer is required between the gas turbine and the synchronous generator, which increases manufacturing costs and reduces efficiency. However, gas turbines have advantages such as being small and producing little noise, and there is a desire to improve efficiency and expand the range of use. A power generation facility that utilizes the exhaust gas of such a conventional gas turbine generator will be explained based on FIG. 1.

A synchronous generator 4 is driven by a gas turbine 2 as a driving source having a governor 1 via a reducer 3, and a part of the electric power generated by the synchronous generator 4 is transmitted to the automatic voltage regulator 5 and The voltage is supplied to the field coil 6 to maintain a constant voltage, and can be taken out to an external load via the shield 7.

At this time, a power generation unit 8 is constituted by a governor 1, a gas turbine 2, a speed reducer 3, a synchronous generator 4, an automatic voltage regulator 5, a field coil 6, and a shaft 7. On the other hand, the exhaust gas of the gas turbine 2 is converted into steam by an exhaust gas boiler 9, and this steam drives a steam turbine 11 as a drive source having a governor 10, and a synchronous generator 12 is driven.

A part of the voltage generated by this synchronous generator 12 is applied to its own field coil 14 via an automatic voltage regulator 13 to maintain a constant voltage, and can also be taken out via a shield 15. It's getting old. These exhaust gas boilers 9,
governor 10, steam turbine 11, synchronous generator 12,
Automatic voltage regulator 13, field coil 14 and shield breaker 1
5 constitutes a power generation unit 16. Also,
A parallel operation synchronization board 1 is provided at the front stage of the disconnectors 7 and 15 to synchronize the power generation unit 16 and the power generation unit 8.
7 is provided. However, such conventional power generation equipment has the following drawbacks.

(1) Since the gas turbine 2 is high-speed, the synchronous generator 4
In the case of connecting to the 2000, an expensive speed reducer 3 is required.

(2) Since the generators driven by the gas turbine 2 and the steam turbine 11 are both synchronous generators 4 and 12,
A parallel operation synchronous board 17 is required when power is supplied to the load.

(3) Since the synchronous generator 4 driven by the gas turbine 2 is decelerated by the reducer 3, the size of the power generation equipment becomes large.

An object of the present invention is to provide power generation equipment that can simplify the facility. The present invention uses an induction generator that is not related to rotational speed as the generator of at least one of the power generation units that includes a drive source and a generator,
This allows for direct connection to high-speed drive sources such as gas turbines, making it possible to omit the reduction gear.
There is an attempt to achieve the above object by omitting a parallel operation synchronous board even when connecting a power generation unit having a synchronous generator.

Hereinafter, one embodiment of the present invention will be described based on FIG. 2.

Here, the same or equivalent components as in the prior art example are designated by the same reference numerals. An induction generator 18 is directly connected to the gas turbine 2 , and the output side of the induction generator 18 is connected to a load (not shown) via a shield and a disconnector 7 . Ma. In addition, a power factor correction capacitor 19 is provided on the output side of the induction generator 18 as necessary.
The delay current of the current is adjusted. A power generation unit 20 is constituted by the gas turbine 2, the one-induction generator 18, the power factor correction capacitor 19, and the breaker 7. On the other hand, the exhaust gas of the gas turbine 2 is guided to an exhaust gas boiler 9 and turned into steam, and the steam generated by the exhaust gas boiler 9 is used as a drive source for the steam turbine 1 having a governor 10.
I am guided by 1.

A synchronous generator 12 is connected to the steam turbine 11, and a part of the electric power generated by the synchronous generator 12 is guided to its own field coil 14 through an automatic voltage regulator 13. As a result, the output voltage of the synchronous generator 12 is controlled to be constant by the automatic voltage regulator 13, and the frequency is controlled to be constant by the governor 10 of the steam turbine 11. Further, a breaker 15 is connected to the output side of the synchronous generator 12, and the output side of the power generation unit 20 is connected via the breaker 15 so that power can be supplied to a load (not shown). has been done. At this time, the exhaust gas boiler 9, the governor 10, the steam turbine 11, the synchronous generator 12, the automatic voltage regulator 13, the field coil 14, and the breaker 15
A power generation unit 16 is configured. In such a configuration, when the gas turbine 2 is rotated, the induction generator 18 is driven to generate a predetermined electric power, and the steam turbine 11 is driven via the exhaust gas boiler 9 to generate a synchronous generator. 12 is driven, and this synchronous generator 1
2 also generates a predetermined power. At this time, the output of the induction generator 18 is controlled by this excitation power supply, so if the rotation speed of the gas turbine 2 is rotating at a rotation speed that can generate a frequency higher than the power supply frequency, there is no relation to the rotation speed. A constant voltage and a constant frequency are always obtained without requiring a separate control device for the induction generator 18. on the other hand,
Since the frequency of the synchronous generator 12 is controlled by the governor 10 and the generated voltage is controlled by the automatic voltage regulator 13, the voltage and frequency on the output side of the synchronous generator 12 can also be kept constant. A parallel operation synchronous board is not required when combining the 16 and 16. As described above, according to this embodiment, since the induction generator 18 is used, the gas turbine 2 can be directly connected to the induction generator 18, and an expensive speed reducer can be omitted. In addition, the generator itself can be made faster and smaller in size. Furthermore, since a parallel operation synchronous board is not required to connect the power generation units 20 and 16, size reduction and cost reduction can be achieved from this point as well. Although the above embodiment has been described with reference to two power generation units, it can also be applied to three or more power generation units, in other words, if the power generation unit includes a unit including an induction generator and a unit including a synchronous generator. good.

As described above, according to the present invention, it is possible to provide power generation equipment that can simplify the facility.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a conventional power generation facility, and FIG. 2 is a system diagram showing an embodiment of the power generation facility according to the present invention. 2...Gas turbine as a driving source, 7...
...Changing and disconnecting, 9...Exhaust gas boiler, 11...
...Steam turbine as a driving source, 12...
・Synchronous generator, 15... conversion or disconnection, 16... power generation unit, 18... induction generator, 20... power generation unit.

Claims (1)

[Claims] 1. In a power generation facility equipped with a plurality of power generation units whose output ends are connected and operated in parallel, one of the plurality of power generation units includes a gas turbine and an induction generator directly connected to the output shaft of the gas turbine, The other power generation units include a steam turbine driven by steam generated from the exhaust heat of the gas turbine, a synchronous generator connected to the output shaft of the steam turbine, and an automatic voltage regulator connected to the excitation winding; A power generation facility comprising a governor provided on the steam turbine.