JPH08168298A - Power generator facility - Google Patents

Abstract

PURPOSE: To improve the efficiency of a power generator facility so as to improve the investment effect of the facility and, at the same time, to shorten the time until emergency power supply is obtained by sharing the facility as an emergency power generator facility and service power generator facility. CONSTITUTION: A power generator facility is constituted of a prime mover 1 and generator 2 and the generator 2 is composed of a synchronous/induction generator and generates electric power as an induction generator by short- circuiting the rotor of the generator 2 when commercial power supply 7 is normal. When the commercial power supply 7 is interrupted while the power supply 7 is made, the generator 2 generates electric power as a synchronous generator by canceling the short-circuiting state and exciting the generator 2 with a direct current from an automatic voltage adjusting device 8 through an AC exciter 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation facility equipped with a prime mover and a generator driven by the prime mover.

[0002]

2. Description of the Related Art Conventionally, a facility having two systems, in which a synchronous generator as an emergency power generation facility and an induction generator as a regular power generation facility are connected to a power bus, has been widely used.

[0003] Normally, regulations of the Fire Service Law obligate the installation of an emergency power supply facility using a synchronous generator as a backup power supply when a commercial power supply fails.

[0004]

However, even if the emergency power supply equipment is provided, the annual operating time is about 10 hours, and the fact is that the equipment is an expensive investment.

An object of the present invention is to provide a power generation facility capable of generating power as a regular power generator, and to significantly reduce cost and facility area.

[0006]

In order to solve the above problems, the present invention uses a synchronous generator and an induction generator in common, that is, uses a synchronous / induction shared generator driven by a prime mover,
It consists of an exciter machine that has a rotor that rotates together with this rotor.The rotor of the synchronous synchronous induction generator can be opened and closed by an auxiliary relay, and the field winding of the exciter machine starts excitation by a timer. , So that the shared generator for synchronous and induction can be used as both synchronous generator and induction generator.

When the commercial power supply is normal, an exciting current can be supplied to the armature from the commercial side to short-circuit the rotor, and the rotating force can be supplied to the generator at the synchronous speed + α from the prime mover to generate electricity as an induction generator. Is. On the other hand, when the commercial power supply fails, the short circuit of the rotor of the generator is released, direct-current excitation is applied, and the rotating force is supplied to the generator by the prime mover at a synchronous speed, whereby the generator can generate electricity.

[0008]

With the above-mentioned means, it becomes possible to make common use for both regular and emergency power generation, and for a user who needs two systems, a regular power generation facility and an emergency power generation facility, only one power generation facility will suffice. It can be reduced. In addition, the function of the regular service is added to the user who needs only the emergency service. Further, in the present invention, since the synchronous generator is switched to the induction generator without stopping the prime mover, it is possible to shorten the time until power feeding at the time of power failure.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

The power generation equipment includes a prime mover 1 and a power generating circuit breaker 4A.
A synchronous / induction shared generator (hereinafter referred to as a SIG generator) 2 connected to a power source bus 12 via an AC exciter 3 having a rotor that rotates integrally with the rotor of the SIG generator 2. To be done.

On the other hand, the commercial power source 7 is similarly connected to the power source bus 12 via the AC breaker 4 for power reception. The presence / absence of the commercial power supply 7 is detected by the power failure detection relay 5, and is connected to the auxiliary relay 5A and the timer 5B shown in the control circuit diagram (C).

FIG. 1B shows a SIG generator 2 and an AC exciter 3.
FIG. The SIG generator 2 is composed of an armature and a rotor, and this rotor can be opened / closed by an auxiliary relay 5A. The AC exciter machine 3 is composed of a rotor and a field winding, and when the timer 5B gives an instruction to start excitation to the field winding, the rotor of the SIG generator 2 is DC-excited via the rectifier 3A.

When the commercial power source 7 is normal, the rotor of the SIG generator 2 is short-circuited by the auxiliary relay 5A, and thus the SIG generator 2 can be operated as an induction generator.

When the prime mover is started in this state, the SIG generator and the AC exciter 3 are also on the same axis, and when rotation is applied and the synchronous speed is exceeded, the AC breaker 4A for power generation is turned on,
Power generation as an induction generator starts. When an instantaneous power failure occurs in this state, the power failure detection relay 5 gives a command to the governor 1A to lower the rotation speed of the prime mover 1 and opens the short circuit of the rotor of the SIG generator 2. This makes it possible to prevent reverse power flow to the commercial side.
When the power failure is restored, the rotor is short-circuited and the motor is returned to the normal state by the existing power setting device 9.

When a long-term power failure occurs, the auxiliary relay 5A opens the rotor short circuit and gives a command to the governor 1A to reduce the rotational speed of the prime mover to the synchronous speed. After (about 2 sec), the AC breaker 4A for power generation is opened by the timer 5B, the DC power supply 10 applies DC excitation to the SIG generator 2 via the AC exciter 3, and a voltage is generated as a synchronous generator.

After initial excitation, the automatic voltage regulator 8 is switched to and the AC breaker 4A for power generation is turned on to supply power to the internal load 11 as an emergency machine.

During this period, the prime mover can supply power in about 5 sec after the occurrence of a power failure as the operation continues.

When the power failure is restored, the operation reverse to the above is performed, the DC excitation by the timer 5B to the rotor of the SIG generator 2 is disconnected, the auxiliary relay 5A short-circuits, and power transmission as an induction generator is started.

The induction generator-synchronous generator is automatically repeated in the above cycle.

[0020]

EFFECTS OF THE INVENTION According to the present invention, it is possible to commonly use the power generation facility as an emergency power generation facility.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of power generation equipment according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Motor, 2 ... Synchronous / induction shared generator (SIG), 3
... AC exciter, 4 ... AC breaker for power reception, 5 ... Power failure detection relay, 6 ... Reverse flow detection relay, 7 ... Commercial power supply, 8 ... Automatic voltage regulator (AVR).

Claims (2)

[Claims] 1. A power generation facility in which a generator is connected to a power bus through a circuit breaker, and the generator is driven by a prime mover, wherein a synchronous / induction shared generator is used as the generator. The child is configured to include an AC exciter that has a rotor that can be opened and closed from the outside by an auxiliary relay, rotates integrally with the rotor of the generator, and has a field winding that is opened and closed from the outside. A power generation facility characterized by that. 2. The synchronous / induction shared generator according to claim 1, wherein the rotational speed required for mutual switching between the induction generator and the synchronous generator is automatically adjusted by a speed governor of a prime mover. Power generation equipment.