JPH06105484A - Uninterruptible power source - Google Patents

Abstract

PURPOSE:To eliminate power interruption at the time of reducing purchasing power by providing a reactive power compensator for compensating the increase in reactive power due to overcurrent at the time of the power interruption. CONSTITUTION:When a power purchasing facility 1 is interrupted, a power purchasing interruption detector 5 is operated, and a breaker 3 is opened. All loads 6 are connected to a non-utility generator facility 2 in this state, and hence the facility 2 becomes an overload state. Therefore, the reactive power of the load is increased. However, the reactive power is detected by signals from current transformers 12, 13 to instantaneously supply capacitive reactive power from a reactive power compensator 11, and hence the overcurrent is suppressed, and a voltage drop is also suppressed. Accordingly, a breaker 7 is opened while a breaker 4 opened by the overcurrent is held closed, and the loads 6 are separated, and hence even if the facility 1 is interrupted, the facility 2 can continue the operation. Thus, power interruption can be eliminated at the time of purchasing power interruption.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterruptible power supply system in which a power generation facility is installed adjacent to a power purchase facility and the power supply to a load device is uninterrupted.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional power supply device having a private power generation facility. In the figure, 1 is a power purchase facility, 2 is a private power generation facility, 3 and 4 are circuit breakers, 5 is a power outage detection device, 6 is a general load, a load device showing an important load, and 7 is a load device 6 of each. It is a circuit breaker that separates.

Next, the operation will be described. When the power purchase facility 1 has a power failure, the power failure detection device 5 operates and the breaker 3 is opened. In this state, an overcurrent flows through the generator of the private power generation facility 2 and the breaker 4 is opened. The power supplied to the load device 6 is once in a power failure state,
When the circuit breaker 7 is opened and the load devices 6 are separated from each other, the circuit breaker 4 is closed and the power is supplied from the private power generation facility 2 to one of the load devices 6 again.

[0004]

In the conventional power supply device as described with reference to FIG. 3, the circuit breaker is opened at the time of power failure.
There was always the problem of a power failure. In addition, it is necessary to re-close the opened circuit breaker 4 to supply power from the private power generation equipment 2, and at the time of return from power purchase, the circuit breaker 4
Power must be supplied to the load device 6 by opening the switch and reclosing the circuit breakers 3 and 7.
There was a problem that the power recovery / recovery control becomes complicated.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an uninterruptible power supply device which can be uninterrupted during a power failure. . Further, it is another object of the present invention to provide an uninterruptible power supply device capable of supplying high quality power by suppressing harmonics.

[0006]

An uninterruptible power supply according to the present invention is an uninterruptible power supply in which a power generation facility and a private power generation facility are provided together, and an increase in reactive power due to an overcurrent during a power failure. Is provided with a reactive power compensator. Furthermore, the uninterruptible power supply device of the present invention is an uninterruptible power supply device in which a power generation facility is provided with a private power generation facility, and a reactive power compensation device that compensates an increase in reactive power due to an overcurrent at the time of power failure. And a harmonic compensator for suppressing harmonics of the power supply.

[0007]

The uninterruptible power supply device of the present invention is provided with the reactive power compensator, so that the reactive power is supplied to the load device at the time of power outage to suppress the occurrence of overcurrent and the voltage drop, and generate power for private use. Since the generator of the equipment can continue to operate, it is possible to achieve uninterruption. Further, the uninterruptible power supply device of the invention is configured to suppress the harmonics of the power supply by including the reactive power compensator and the harmonic compensator, and can supply a high-quality power supply to the load device. It is a thing.

[0008]

EXAMPLES Example 1. Embodiment 1 of the present invention will be described below with reference to FIG.
It will be described based on. In FIG. 1, 1 is a power purchase facility, 2
Are power generation equipment for private use, 3 and 4 are circuit breakers for controlling the opening and closing of the power supplied from the power purchase equipment 1 and the private power generation equipment 2, 5
Is a power outage detection device, 6 is a general load, a load device showing an important load, 7 is a circuit breaker for separating each load device 6, 11 is a reactive power compensator, and 12 and 13 are provided in a power supply path. It is a current transformer that sends a signal to the reactive power compensator 11.

Next, the operation of the first embodiment will be described. In FIG. 1, when the power purchase facility 1 loses power, the power purchase power failure detection device 5 operates and the breaker 3 is opened. In this state, all the load devices 6 are connected to the private power generation equipment 2, and the private power generation equipment 2 is overloaded, so that the reactive power of the load increases. However, since the reactive power is detected by the signals from the current transformers 12 and 13 and the capacitive reactive power is instantaneously supplied from the reactive power compensator 11, the overcurrent is suppressed and the voltage drop is also suppressed.
Therefore, since the circuit breaker 7 is opened and the load devices 6 are separated while the circuit breaker 4 which is opened by the overcurrent is kept in the closed state, even if the power purchase facility 1 is out of power. The power purchase private power generation facility 2 can continue to operate. As a result, the power supply can be made uninterruptible.

Embodiment 2. The second embodiment of the present invention will be described below with reference to FIG. The same parts as those in FIG. 1 are designated by the same reference numerals, and the description of their configurations will be omitted.
In FIG. 2, reference numeral 14 is a harmonic compensator, which is provided in parallel with the reactive power compensator 11.

Next, the operation of the second embodiment will be described. In the above-described first embodiment, the case where the reactive power compensator 11 is used to make the power uninterruptible has been described, but similarly in the embodiment of FIG. 2, the power purchase facility 1 has a power failure and the private power generation facility 2 has an overcurrent.
The reactive power compensator 11 operates before causing the voltage drop, and the private power generation equipment 2 continues to operate, resulting in no power failure. Further, since the harmonic compensating device 14 can supply the advanced reactive power, the capacity of the reactive power compensating device 11 can be reduced. Further, the harmonic compensator 14 can absorb or compensate the harmonic (distorted wave) generated from the load device 6 during the steady operation of the power supply device, so that the quality of the power supply can be improved.

[0012]

As described above, according to the present invention, by providing the reactive power compensator in the power supply facility in which the power purchase facility and the private power generation facility are in parallel operation, the power source is made uninterruptible. An uninterruptible power supply device can be provided. Further, by providing a harmonic compensating device in addition to the reactive power compensating device, uninterruption can be achieved, harmonics can be suppressed, and a higher quality power source can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a block diagram showing a power supply device including a conventional private power generation facility.

[Explanation of symbols]

 1 Power Purchase Equipment 2 Private Power Generation Equipment 3 Circuit Breaker 4 Circuit Breaker 5 Power Purchase Blackout Detection Device 6 Load Device 7 Breaker 11 Reactive Power Compensator 12 Current Transformer 13 Current Transformer 14 Harmonic Compensator

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Claims (2)

[Claims] 1. An uninterruptible power supply system in which a private power generation facility is installed in addition to a power purchase facility, and a reactive power compensator for compensating for an increase in reactive power due to overcurrent at the time of power failure is provided. Blackout power supply. 2. In an uninterruptible power supply in which a power generation facility is provided with a private power generation facility, harmonics of a reactive power compensator for compensating for an increase in reactive power due to an overcurrent at the time of power failure and a harmonic of the power supply are suppressed. An uninterruptible power supply comprising a harmonic compensator.