JP2753124B2 - Power generation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention performs high-speed excitation control when applying a superconducting generator to a power generation facility driven by a tandem compound type steam turbine, and The present invention relates to a power generation facility capable of reducing the size and weight of the facility.

(Conventional technology) Recently, a rapid response excitation type (about 3000 A / s) that rapidly controls the excitation of the field winding of a superconducting generator equipped with a superconducting rotor using a superconducting wire as a rotating field winding. Superconducting generators have been developed.

FIG. 3 shows a schematic configuration diagram of a shaft system of a conventional superconducting power generation facility, and FIG. 4 similarly shows an electric circuit connection configuration.

In the fast-excitation type superconducting generator, the superconducting wire for pulses is used to minimize the loss of the superconducting wire during fast-excitation, and the high-resistance, high-strength non-magnetic steel is used for the rotor material to suppress eddy current loss. Is used as the excitation controller, and a controller capable of applying a high excitation voltage (approximately 5000 V in top voltage) is used.

(Problems to be Solved by the Invention) As described above, in the fast response excitation type superconducting generator,
Since a large excitation voltage (approx. 5000 V) can be applied and the rotor is designed to withstand the strong electromagnetic force of rapid response excitation, a lot of space is required to install the rotor field winding. The output density of the magnetic field generator became low, the generator became large, and the exciting capacity of the exciter became large because the value of the inductance of the field winding was large. In addition, the liquid helium cooling system has been enlarged to cool down the heat generated during the transition.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a power generation facility capable of performing excitation control at a high speed and reducing the size and weight of the facility.

[Configuration of the invention]

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, in a power generation facility driven by a tandem compound type steam turbine, the power generation capacity is rapidly controlled by exciting (about 3000 A / s).
And a fast-adaptive excitation type superconducting generator that supplies the fluctuating load necessary for stabilization during transients, and the basic load of this power generation facility that only performs excitation control that has been developed so far and is slow enough to follow load. And a conventional superconducting generator, which supplies the power, is divided into a plurality of generators, and excitation control is performed as an entire generator group.

(Function) By dividing the generator into a variable load type and a basic load type, the capacity of the fast-excitation type superconducting generator that performs rapid excitation control is smaller than that of the case where only the fast-excitation type is used. As a result, the power density is improved as a group of generators, so the installation space can be reduced, and the generator that performs rapid response excitation is downsized, so that the liquid helium cooling system for cooling heat generated during transients is also small. Become Furthermore, the value of the inductance of the field winding of the fast excitation type generator is reduced, so that the excitation capacity is reduced and the size of the exciter is also reduced.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. First
FIG. 1 shows a schematic configuration diagram of a shaft system of a superconducting generator facility according to an embodiment of the present invention, and FIG. 2 also shows an electric circuit connection configuration.

In FIG. 1, a high-pressure steam turbine (1), a medium-pressure steam turbine (2), and a low-pressure steam turbine (3), (4) are configured as one motor, and generators (6), (7) are coaxially mounted. ) Is a tandem compound method, and (5) is a boiler.

In the present invention, as shown in FIG. 1, the generators are connected in tandem as a superconducting generator (6) of a quick response excitation type and a conventional superconducting generator (7). Since the inductance of the field winding (8) of the generator (7) is large and the time constant is long, a low-speed AVR (9) that performs only excitation control (top voltage of about 3000 V) that is slow enough to follow a load is installed.

The terminal voltage of the generator (7) drops sharply when the state changes abruptly, for example, at the time of system disturbance, but has no function of compensating for this. On the other hand, the generator (6) has a high-speed AVR (10) to which a high excitation voltage (top voltage of about 5000 V) can be applied,
Voltage compensation is performed by controlling the exciting current of the field winding (12) via the thyristor converter (11). Generator (6),
Since (7) is directly connected by a phase separation bus, two generators are electrically operated in parallel, and the voltage drop of the generator (7) is compensated by the AVR of the generator (6). From another point of view, it can be considered that the superconducting generator (6) of the quick response excitation type supplies reactive power corresponding to the voltage drop of the conventional superconducting generator (7) as a circulating current. Can also.

In this embodiment, by dividing the generator into a basic load for a variable load, the capacity of the super fast excitation type superconducting generator for performing rapid excitation control is reduced, so that the super fast excitation type superconducting generator is used. Since the output density is improved as a group of generators compared to the case of a single unit, the installation space can be reduced, and the generator that performs rapid response excitation is downsized, so that the liquid for cooling the heat generated during transients The helium cooling system is also downsized. Furthermore, the value of the inductance of the field winding of the fast excitation type generator is reduced, so that the excitation capacity is reduced and the size of the exciter is also reduced.

In the above embodiment, the AVR is installed in the field winding (8) of the generator (7). However, a system without the AVR is also possible, and the field winding (8) is made of a superconducting wire. It is also possible to adopt a system in which a short circuit occurs and a permanent short-circuit current continues to flow.

In this case, the equipment is reduced in size by omitting the equipment,
The reliability can be improved by simplifying the system.

〔The invention's effect〕

According to the present invention as described above, of the generator equipment,
Providing power generation equipment that can reduce the capacity of the super-speed excitation type superconducting generator that performs rapid excitation control, so that excitation control as a group of generators can be performed at high speed, and the equipment can be reduced in size and weight can do.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a shaft system of a superconducting power generation facility according to one embodiment of the present invention, FIG. 2 is a configuration diagram of an electric circuit connection in FIG. 1,
FIG. 3 is a schematic configuration diagram of a shaft system of a conventional superconducting power generation equipment, and FIG. 4 is a configuration diagram of an electric circuit connection in FIG. DESCRIPTION OF SYMBOLS 1 ... High-pressure steam turbine, 2 ... Medium-pressure steam turbine 3 ... Low-pressure steam turbine-14 ... Low-pressure steam turbine-2 5 ... Boiler 6 ... Fast-excitation type superconducting generator 7 ... Conventional superconducting Generator 8 Field winding (conventional superconducting generator) 9 AVR (low speed type), 10 AVR (high speed type) 11 Thyristor converter 12 Field winding (rapid excitation) Type superconducting generator) 13 Current transformer, 14 Transformer 15 Main transformer

Claims (1)

(57) [Claims] 1. A plurality of generators including a superconducting generator configured to supply and store a liquid-phase refrigerant inside a rotor and cool a superconducting field winding inside the rotor, to a set of prime movers. Mechanically connected to one shaft, at least one of the superconducting generators is a fast-acting excitation type superconducting generator capable of rapid excitation control at the time of system disturbance etc., and these generators are electrically connected in parallel. A power generation facility which is connected to and performs voltage control and the like by an excitation control device attached to a fast excitation type superconducting generator.