JP2000217274A - Uninterruptible power system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an uninterruptible power system which is low in total cost and running cost and is small in occupancy area of installation. SOLUTION: This uninterruptible power system is equipped with a plurality of normal uninterruptible power units SPS1-SPS4, each of which has an AC switch connected between a commercial power source and a load, an inverter, and a rechargeable battery, and a single back-up uninterruptible power unit SPSB. When the commercial power source is sound, the load is supplied with power by the power units SPS1-SPS4, and also the battery B is charged via the inverter of the power unit. When the commercial power is turned off, the load is supplied with power without instantaneous break in the inverter of the power units SPS1-SPS4, and at power recovery of the commercial power source, it is restored to action when sound. When there is failure of one of normal uninterruptible power unit, the load of the power unit is supplied with power without instantaneous break from the back-up power unit SPSB.

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 most suitable for uninterruptible power supply in a semiconductor factory or the like.
S).

[0002]

2. Description of the Related Art
Various uninterruptible power supply systems are known, but generally have a problem that the total system capacity tends to be large, and the total cost, the running cost, and the area occupied by equipment are large. Therefore, the present invention aims to provide an uninterruptible power supply system capable of solving these problems, improving economy and realizing space saving.

[0003]

According to a first aspect of the present invention, there is provided an AC switch connected between a commercial power supply and a load, and an inverter connected to an output side of the AC switch. And a plurality of service uninterruptible power supplies having a rechargeable battery connected to the inverter and a single backup uninterruptible power supply. When the commercial power supply is healthy, the service uninterruptible power supply is provided. By supplying power to the load and charging the battery via the inverter of the power supply unit, and when the commercial power supply fails, power is supplied to the load from the inverter of the normal system uninterruptible power supply without interruption, and When the power is restored, the operation is restored to the normal operation. When any of the service uninterruptible power supply fails, the backup uninterruptible power supply is added to the load of the power supply. It is intended to power without interruption from the device.

According to a second aspect of the present invention, there is provided an AC switch connected between a commercial power supply and a load, an inverter connected to an output side of the AC switch, and a rechargeable battery connected to the inverter. A plurality of service uninterruptible power supplies having a backup DC input inverter, and when the commercial power supply is sound, the service uninterruptible power supply supplies power to the load and the inverter via the power supply. The battery is charged, and in the event of a commercial power outage, the load is supplied to the load from the inverter of the regular system uninterruptible power supply without an instantaneous interruption, and when the commercial power is restored, the operation is restored to the normal operation. In the event of a failure of the uninterruptible power supply, the backup DC input inverter supplies power to the load of the power supply without interruption.

According to a third aspect of the present invention, there is provided an AC switch connected between a commercial power supply and a load, an inverter connected to an output side of the AC switch, and a rechargeable battery connected to the inverter. A plurality of service uninterruptible power supply units having the following, and a bypass breaker connected between output terminals of at least two adjacent service uninterruptible power supply units, wherein the bypass breaker is turned off when the commercial power is normal At the same time, the load is supplied to the load by the service uninterruptible power supply, and the battery is charged through the inverter of the power supply. When the commercial power supply fails, the inverter of the service uninterruptible power supply is turned off with the bypass breaker turned off. Power supply to the load without any instantaneous interruption, and when the commercial power is restored, the operation returns to the normal operation. In the event of a failure of the power supply unit, the service breaker connected to the output terminal of the power supply unit is turned on, and the service unit that has failed from another service uninterruptible power supply unit to which the bypass breaker is connected. Power to the load.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, FIG. 1 shows a first embodiment of the present invention. For example, when the total capacity of the entire factory requiring uninterruptible power supply is 2000 KVA, from the viewpoint of risk distribution,
Four 500KVA regular SPSs are provided, and 500K is used as a backup system (hereinafter referred to as B / U system as necessary) to increase the reliability of power supply to the load.
This is a system provided with one VA SPS.

In FIG. 1, an AC circuit breaker and high-voltage insulating transformers T _B , T ₁ , T ₂ , T ₃ , and T are provided in a 6600 V distribution system.
₄ (both 500KVA, 6600V / 420V) and a backup system uninterruptible power supply of 500 KVA through the circuit breaker SPS _B and conventional systems UPS SP
S ₁ , SPS ₂ , SPS ₃ , SPS ₄ (No. 1 to No. ₄ system) are connected in parallel.

These power supply devices SPS _B , SPS ₁ , SP
S _2, SPS _3, SPS ₄ are each AC switch S _B and an inverter INV _B, similarly S ₁ and INV _1, similarly S ₂ and INV _2, likewise S ₃ and INV _3, also includes a S ₄ and INV ₄ And each of the AC switches S _B , S ₁ ,
Wiring circuit breakers are connected in parallel to S ₂ , S ₃ , and S ₄ , respectively. The inverters INV _B , INV ₁ , INV
DC power is supplied to V ₂ , INV ₃ , and INV ₄ from a chargeable common battery B via a DC branch board.

[0009] The normal system uninterruptible power supply SPS ₁ , SPS ₂ ,
The output sides of SPS ₃ and SPS ₄ are the electromagnetic contactors C ₁ , C ₂ and C
_3, through the C ₄ and circuit breaker, power supply terminals 11,2
1, 31, and 41 are connected to a load of 500 KVA. AC switches S ₁₁ , S ₂₁ , S ₃₁ , and S ₄₁ are connected between the output side of the backup uninterruptible power supply SPS _{B and} the output sides of the electromagnetic contactors C ₁ , C ₂ , C ₃ , and C ₄ , respectively. An electromagnetic contactor is connected to each of the AC switches S ₁₁ , S ₂₁ , S ₃₁ , and S ₄₁ in parallel. Note that wiring breakers are also connected between the output side of the backup uninterruptible power supply SPS _B and the power supply terminals 11, 21, 31, and 41, respectively.

The AC switches S ₁₁ , S ₂₁ , S ₃₁ , S ₄₁
Is the corresponding service uninterruptible power supply SPS ₁ , SPS ₂ ,
This is for switching the power supply to the backup uninterruptible power supply SPS _B when SPS ₃ and SPS ₄ fail.
Further, since the electromagnetic contactor is connected in parallel to the AC switch _{S 11, S 21, S 31} , S 41, the AC switch S _11, S
₂₁ , S ₃₁ , and S ₄₁ can be designed with a short-time tolerance.

Next, the operation of this embodiment will be described with reference to FIGS. First, FIG. 2 shows the operation when the commercial power supply is in a healthy state, and the flow of electric power supplied to the load is indicated by a solid line arrow. At this time, the service uninterruptible power supplies SPS ₁ , SPS ₂ , SPS ₃ , SPS ₄ are all in operation, the AC switches S ₁ , S ₂ , S ₃ , S ₄ are all on and the inverter INV ₁ , INV ₂ , IN
V ₃ and INV ₄ are in the charge mode of the common battery B. At the same time, the backup uninterruptible power supply SPS _B
It is also in the operating state, until the AC switch S _B AC switch is not turned on _{S 11, S 21, S 31} , S 41 is a voltage standby state. The AC switches S ₁₁ , S ₂₁ , S ₃₁ ,
_S41 and the electromagnetic contactors connected in parallel to them are in the off state.

[0012] In this state, since the matching phase of the system voltage is, all the uninterruptible power supply SPS _B, SP
The output voltage phases of S ₁ , SPS ₂ , SPS ₃ and SPS ₄ are in phase. For this reason, the temporary system uninterruptible power supply SPS
₁ , SPS ₂ , SPS ₃ , or SPS ₄ , even if one of them fails, the AC switch S ₁₁ ,
By turning on one of _{S 21, S 31, S 41} , it is possible to switch to a backup system uninterruptible power supply SPS _B without interruption.

Next, the operation at the time of an input power failure (for the sake of convenience, the instantaneous drop of the input voltage is also included) will be described with reference to FIG. In this case, all power supplies SP
S _B , SPS ₁ , SPS ₂ , SPS ₃ , SPS ₄ detect a power failure within １ ／ cycle of the system power supply and switch to the UPS mode (independent operation mode). That is, the AC switches S _B , S ₁ , S ₂ , S ₃ , S ₄ are turned off, and the inverter I
NV _B, to supply the load by operation of the _{INV 1, INV 2, INV 3} , INV 4.

At this time, each of the inverters INV ₁ , INV ₂ ,
INV ₃ and INV ₄ are backup inverters INV
By performing synchronous control on the output voltage of _B , basically, each power supply device SPS _B , SPS ₁ , SPS ₂ , SPS ₃ , SP
Output voltage phase of the S ₄ is the same phase. In this state, if any of the service uninterruptible power supply devices SPS ₁ , SPS ₂ , SPS ₃ , SPS ₄ fails, the AC switches S ₁₁ , S ₂₁ , S ₃₁ , S ₄₁ corresponding to the failed power supply device by turning on one of, it is switched to the backup system uninterruptible power supply SPS _B without interruption.

Further, when the input power is restored (when the commercial power or the DG power is restored), the normal system uninterruptible power supply S
PS _1, the SPS _2, input in a state in which SPS _3, SPS ₄ is free-standing operation power recovery, will automatically return to operation at the time of commercial power healthy Make sure each power supply input voltage .

Next, a second embodiment of the present invention will be described with reference to FIG. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, the backup system uninterruptible power supply is configured from only the DC input inverter INV _B, when the input sound, when the input power failure, the basic operation of the power recovery is the same as in the first embodiment . According to the present embodiment, the high-voltage insulating transformer (T _B in FIG. 1) on the input side of the backup uninterruptible power supply is not required, and the cost is reduced by simplifying the backup uninterruptible power supply SPS _B ′. Becomes possible.

Next, FIGS. 5 to 8 show a third embodiment of the present invention.
Is shown. The same components as in the first and second embodiments
Are denoted by the same reference numerals and description thereof is omitted. This implementation
Is not equipped with a backup uninterruptible power supply,
System uninterruptible power supply SPS₁, SPS₁’, SPS_Two, S
PS_Two’Output side is a circuit breaker BR ₁₁, BR₁₂, BR
_{twenty one}, BR_{twenty two}To the power supply terminals 11, 21, 31, 41 via
Connected, and between the power supply terminals 11 and 21
Bypass breaker BB₁Are connected to the power supply terminals 31 and 4
Between 1 is a bypass breaker BB_TwoIs connected.

Basically, power supply devices SPS ₁ , SP
When S ₁ ′, SPS ₂ , SPS ₂ ′ are sound (when there is no failure)
Turns off the bypass breakers BB ₁ and BB ₂ and individually supplies power to each load from each power supply device. If any of the power supply devices SPS ₁ , SPS ₁ ′, SPS ₂ , SPS ₂ ′ fails, the bypass breaker BB ₁ or BB ₂
Is turned on, power is also supplied from the healthy power supply device to the load of the failed device. For this reason, each power supply device has twice the capacity of the load capacity.

Hereinafter, the operation will be described separately when the input is sound, when the input is out of power, and when there is a failure. FIG. 6 shows the flow of power when the input is sound. In this case, each of the power supply devices SPS ₁ , S
PS ₁ ′, SPS ₂ , SPS ₂ ′ supply power to the respective loads. At this time, the circuit breakers BR ₁₁ , BR ₁₂ , B
R ₂₁ and BR ₂₂ are all on, bypass breakers BB ₁ ,
BB ₂ are both off.

FIG. 7 shows the flow of electric power at the time of an input power failure. In this case, each of the power supplies SPS ₁ , SPS ₁ ′,
SPS ₂ and SPS ₂ ′ are in the UPS mode, the circuit breakers BR ₁₁ , BR ₁₂ , BR ₂₁ , and BR ₂₂ are all on, and the bypass breakers BB ₁ and BB ₂ are all off.
When the commercial power is restored, the operation returns to the normal operation shown in FIG.

FIG. 8 shows the operation when the power supply unit fails. For example, if the power supply SPS ₁ fails on input sound, the bypass breaker BB ₁ are turned on to supply power from the power supply SPS ₁ '. At this time, the circuit breaker BR ₁₁ off, the BR ₁₂ ON. Therefore, the power supply device SPS ₁ ′ supplies power to a load capacity of 1000 KVA at the maximum. If the power supply is switched only by the bypass breaker, instantaneous interruption switching is performed. Therefore, if an AC switch is connected in parallel to the bypass breaker, a system capable of instantaneous interruption switching is provided.

[0022]

As described above, according to the first aspect of the present invention, all the uninterruptible power supplies including the backup system can be constituted by the standard SPS having the same capacity, and the total system capacity can be reduced. Standardization of component devices can be achieved. According to the second aspect of the present invention, the configuration of the backup uninterruptible power supply device is simplified, and the high-voltage insulating transformer on the input side is omitted, so that the equipment cost and the occupied area can be reduced. According to the third aspect of the invention, there is an advantage that the system configuration is simple and the capacity of each power supply device is large, but the backup system uninterruptible power supply device is not required.

[Brief description of the drawings]

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

FIG. 2 is an operation explanatory diagram of the first embodiment.

FIG. 3 is an operation explanatory diagram of the first embodiment.

FIG. 4 is a circuit diagram showing a second embodiment of the present invention.

FIG. 5 is a circuit diagram showing a third embodiment of the present invention.

FIG. 6 is an operation explanatory diagram of the third embodiment.

FIG. 7 is an operation explanatory diagram of the third embodiment.

FIG. 8 is an operation explanatory diagram of the third embodiment.

[Explanation of symbols]

T _B , T ₁ , T ₂ , T ₃ , T ₄ High voltage isolation transformer SPS _B Backup system uninterruptible power supply SPS ₁ , SPS ₂ , SPS ₃ , SPS ₄ , SPS ₁ ′, S
PS ₂ 'conventional system uninterruptible power supply (Nanba1～nanba4 _{system) S B, S 1, S} 2, S 3, S 4, S 11, S 21, S 31, S 41
AC switch INV _B , INV ₁ , INV ₂ , INV ₃ , INV ₄ Inverter C ₁ , C ₂ , C ₃ , C ₄ Electromagnetic contactor B Common battery BR ₁₁ , BR ₁₂ , BR ₂₁ , BR ₂₂ Wiring breaker BB ₁ , BB ₂ bypass breaker 11, 21, 31, 41 power supply terminal

Claims (3)

[Claims] 1. An uninterruptible power supply that constantly supplies power to a load with a commercial power supply, comprising: an AC switch connected between the commercial power supply and the load; an inverter connected to an output side of the AC switch; A plurality of service uninterruptible power supplies having a rechargeable battery connected to the power supply and a single backup uninterruptible power supply.When the commercial power supply is healthy, the load is controlled by the service uninterruptible power supply. The power is supplied and the battery is charged through the inverter of the power supply device.When the commercial power supply fails, the load is supplied from the inverter of the service uninterruptible power supply to the load without any interruption. Restores the normal operation and, in the event of failure of any service uninterruptible power supply, applies the backup uninterruptible power supply to the load of the power supply. Uninterruptible power supply system, characterized in that the feeding without interruption from the device. 2. An uninterruptible power supply that constantly supplies power to a load with a commercial power supply, comprising: an AC switch connected between the commercial power supply and the load; an inverter connected to an output side of the AC switch; A plurality of service uninterruptible power supplies having a rechargeable battery connected to the power supply and a backup DC input inverter, and when the commercial power supply is healthy, the load is supplied to the load by the service uninterruptible power supply, respectively. The battery is charged through the inverter of the power supply device, and when the commercial power supply fails, the load is supplied from the inverter of the service type uninterruptible power supply to the load without interruption, and when the commercial power supply is restored, the normal operation is performed. If any of the service uninterruptible power supply fails, the backup system DC input Uninterruptible power supply system, characterized in that the feeding without interruption from over data. 3. An uninterruptible power supply that always supplies power to a load with a commercial power supply, comprising: an AC switch connected between the commercial power supply and the load; an inverter connected to an output side of the AC switch; A plurality of service uninterruptible power supplies having a rechargeable battery connected to the power supply and a bypass breaker connected between at least output terminals of two adjacent service uninterruptible power supplies; When the power supply is normal, power is supplied to the load by the service uninterruptible power supply with the bypass breaker turned off, and the battery is charged via the inverter of the power supply.When the commercial power supply fails, the bypass breaker is turned off. The load is supplied from the inverter of the service type uninterruptible power supply to the load without instantaneous interruption, and the power is restored when the commercial power is restored. In the event of failure of any of the service uninterruptible power supplies, the bypass breaker connected to the output terminal of the power supply is turned on and the other breaker connected to that bypass breaker is turned on. An uninterruptible power supply system, wherein power is supplied from a system uninterruptible power supply to a load of a failed service uninterruptible power supply.