JP2890373B2 - Operation command device for fuse for cogeneration - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a so-called cogeneration facility having a commercial power source and a self-generated power source consisting of a gas turbine generator.
The present invention also relates to a cogeneration fuse operation command device for protecting a gas turbine generator and a load by using a cogeneration fuse.

[0002]

2. Description of the Related Art Conventionally, in a cogeneration system in which a self-generated power source is a gas turbine generator, for example, even if an electric accident occurs in a commercial power system, a load (particularly an important load) is applied to the gas turbine generator. There is an increasing demand to continue to supply power from. As a result, an excessive torsion torque is generated in the gas turbine generator, and in some cases, the torque is damaged. Therefore, conventionally, a protection member called a "sharpin" is attached to the shaft of the gas turbine generator so as to protect the shaft of the gas turbine generator.

[0003]

However, if the shear pin breaks due to excessive shaft torsion torque or the like, it will be necessary to mount it again on the generator shaft.
The work is not always easy, and there is a problem that it takes time. Therefore, an object of the present invention is to enable high-speed protection without breaking a shear pin.

[0004]

According to a first aspect of the present invention, there is provided a gas turbine generator of a cogeneration facility using both a commercial power supply and a self-generated power supply comprising a gas turbine generator. At the output end of the device, a fuse for cogeneration, a phase current detector and a phase voltage detector are provided, and a calculating means for calculating an instantaneous electric torque from the detected phase current and phase voltage is provided. Is greater than a predetermined value,
An operation command is given to the cogeneration fuse.

According to a second aspect of the present invention, in a cogeneration facility using both a commercial power supply and a self-generated power supply comprising a gas turbine generator, a cogeneration fuse is provided between the commercial power supply and a load. At the output end of the gas turbine generator, there are provided a phase current detector and a phase voltage detector, and a calculating means for calculating an instantaneous electric torque from the detected phase current and phase voltage. When the value exceeds a predetermined value, an operation command is given to the cogeneration fuse.

Further, in the third aspect of the present invention, in a cogeneration facility using both a commercial power supply and a self-generated power supply composed of a gas turbine generator, the cogeneration equipment has a load between the commercial power supply and the load and between the gas turbine generator and the load. A cogeneration fuse is provided, and a phase current detector and a phase voltage detector are provided at an output end of the gas turbine generator, and a calculating means for calculating an instantaneous electric torque from the detected phase current and phase voltage is provided. When the calculated instantaneous electric torque exceeds a predetermined value, an operation command is given to each of the cogeneration fuses.

[0007]

[Function] An instantaneous electric torque is obtained from a phase voltage and a phase current of a gas turbine generator as a self-generated power source, and when the instantaneous electric torque exceeds a predetermined value, an operation command is given to a cogeneration fuse to operate it. The high-speed protection operation can be performed without breaking the shear pin of the gas turbine generator. The fuse for cogeneration should be connected only between the commercial power system and the load, only between the gas turbine generator and the load, or between the power system and the load, and between the gas turbine generator and the load. Can be provided.

[0008]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.
2 is a block diagram showing a specific example of the instantaneous electric torque calculator of FIG. 1, FIG. 3 is an explanatory diagram for explaining a simulation operation according to the present invention, and FIG. 4 is a schematic diagram showing a cogeneration facility to which the present invention is applied. FIG. That is, as shown in FIG. 4, a cogeneration facility to which the present invention is applied is a commercial power system 1, a load 2 (a general load 2).
1, important load 22), cogeneration fuses 31, 32, gas turbine generator 4 (gas turbine 4).
1, generator 42), power receiving transformer 5, phase voltage detector (P
T) 7 and a phase current detector (CT) 8. Although the fuse 31 is mainly used for protecting the generator and the fuse 32 is used for protecting the load, it is also possible to provide only one of the fuses 31 and 32.

As shown in FIG. 2, for example, the instantaneous electric torque calculator includes calculators 611, 612, 613 and a multiplier 61.
4, 615 and an adder 616. That is, each phase voltage detection signal Va, Vb, Vc is input to the arithmetic unit 611 via PT7, and each phase current detection signal Ia, Ib, Ic is input to the arithmetic unit 612 via CT8. (1) as shown by the following equations 1 and 2
Equations (2) are used to calculate voltages Vα, V based on α and β axes.
β and currents Iα and Iβ are obtained.

(Equation 1)

(Equation 2)

Next, an arithmetic unit 613 performs an arithmetic operation of the following equation (3) as shown by the following equation (3) to obtain magnetic fluxes φα, α, β based on α and β axes.
Find φβ.

(Equation 3) In the multiplier 614, the magnetic flux φα and the current Iβ, and the multiplier 61
In step 5, the magnetic flux φβ is multiplied by the current Iα, and an adder 616 calculates the following equation (4) to calculate an instantaneous electric torque value (instantaneous electric torque Te).

(Equation 4)

The fuse operation command unit 62 compares the instantaneous electric torque Te calculated as described above by the instantaneous electric torque calculator 61 with an instantaneous electric torque Te ^* which is a fuse operation limit value suitable for the gas turbine generator. Then, the fuse is activated or deactivated according to the relationship shown in the following Expression 5.

(Equation 5) That is, in the case as shown in FIG. 4, an electric accident occurs in the commercial power supply system 1, the output of the gas turbine generator 4 increases, and the instantaneous electric torque Te calculated by the instantaneous electric torque calculator 61 becomes a predetermined value. When a value Te ^* above, the operation command is given to the fuse 31 from the fuse operation command unit 62, a gas turbine generator 4 and common load 2
1. The important load 22 is disconnected instantaneously.

FIG. 3A shows the result of the simulation operation according to the present invention. here,
The solid line Te ¹ shows the case where the fuse is not operating, and the dotted line Te 1
² shows a case in which the fuse is operated, if the fuse is operated indicates that such operation signal in FIG (B) is issued at time t _s.

[0013]

According to the present invention, the instantaneous electric torque is obtained from the current and voltage of the gas turbine generator, and when the instantaneous electric torque exceeds a predetermined value, the cogeneration fuse is operated. The advantage is obtained that the high-speed protection is possible without breaking the shear pin.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a specific example of the operation command device of FIG. 1;

FIG. 3 is an explanatory diagram for explaining a simulation operation.

FIG. 4 is a schematic diagram showing a cogeneration facility to which the present invention is applied.

[Explanation of symbols]

1: commercial power system, 21: general load, 22: important load,
31, 32: Cogeneration fuse, 4: Gas turbine generator, 41: Gas turbine, 42: Generator, 5: Power receiving transformer, 6: Operation command device, 61: Instantaneous electric torque calculator, 62: Fuse Operation commander, 61
1, 612, 613: arithmetic unit, 614, 615: multiplier, 616: adder, 7: phase voltage detector (PT), 8 ...
Phase current detector (CT).

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Iki 1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-city, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Hiroshi Murayama 1st Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture No. 1 Fuji Electric Co., Ltd. (56) References JP-A-1-257772 (JP, A) JP-A-5-15067 (JP, A) JP-A-5-268798 (JP, A) JP-A-6-260 339300 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) H02P 9/00-9/48 H02H 3/32-3/52 H02H 7/06 H02J 3/00-5/00

Claims (3)

(57) [Claims] Claims: 1. A cogeneration facility using a commercial power supply and a self-generated power supply comprising a gas turbine generator,
At the output end of the gas turbine generator, a cogeneration fuse, a phase current detector, and a phase voltage detector are provided, and calculation means for calculating an instantaneous electric torque from the detected phase current and phase voltage is provided. An operation command device for a cogeneration fuse, wherein an operation command is given to the cogeneration fuse when the instantaneous electric torque obtained becomes equal to or more than a predetermined value. 2. A cogeneration facility using both a commercial power supply and a self-generated power supply comprising a gas turbine generator.
A cogeneration fuse is provided between the commercial power supply and the load, and a phase current detector and a phase voltage detector are provided at an output terminal of the gas turbine generator, and instantaneous electric power is detected from the detected phase current and phase voltage. Operating means for calculating the torque, wherein when the calculated instantaneous electric torque exceeds a predetermined value, an operation command is given to the cogeneration fuse. apparatus. 3. A cogeneration facility using both a commercial power supply and a self-generated power supply comprising a gas turbine generator,
A fuse for cogeneration is provided between the commercial power supply and the load and between the gas turbine generator and the load, and a phase current detector and a phase voltage detector are detected at an output end of the gas turbine generator. Calculating means for calculating the instantaneous electric torque from the phase current and the phase voltage, and when the calculated instantaneous electric torque becomes a predetermined value or more, an operation command is given to each of the cogeneration fuses. An operation command device for a cogeneration fuse, characterized in that: