JP4396060B2 - Unit type uninterruptible power supply - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a unit type uninterruptible power supply, and more specifically, converts a three-phase AC power from a three-phase AC power source into an uninterruptible three-phase AC output, a pair of input terminals and a pair of outputs. The present invention relates to a unit-type uninterruptible power supply apparatus configured to include n power supply units using 2n power supply units having terminals.
[0002]
[Prior art]
A unit type uninterruptible power supply device that converts single-phase AC power from a single-phase AC power source into uninterruptible single-phase AC output has a single input terminal and a pair of output terminals as shown in FIG. One in which phase power supply units are connected in parallel is known.
[0003]
That is, in FIG. 7, the power supply unit 10 has a pair of input terminals 101 and 102 and a pair of output terminals 103 and 104, and the power supply unit 20 has a pair of input terminals 201 and 202 and a pair of output terminals 203 and 204. The power supply unit 30 has a pair of input terminals 301 and 302 and a pair of output terminals 303 and 304. The power supply unit 10 has a single-phase alternating current from a single-phase alternating current power supply to the input terminals 101 and 102. Input power conversion unit 11 that receives power and switches it to obtain a DC intermediate output, capacitors 12 and 13 that smooth the DC intermediate output, and switches the DC intermediate output to output terminals 103 and 104. Output-side power conversion unit 14 for obtaining a single-phase AC output, and the power supply unit 20 is connected to input terminals 201 and 202 from a single-phase AC power source. Phase AC power is input, and the input side power conversion unit 21 that obtains a DC intermediate output by switching the phase AC power, capacitors 22 and 23 that smooth the DC intermediate output, and the DC intermediate output that switches the output terminal 203, 204 has an output-side power conversion unit 24 that obtains a single-phase AC output, and the power supply unit 30 switches the input power of the single-phase AC power from the single-phase AC power source to the input terminals 301 and 302. Input side power converter 31 for obtaining a DC intermediate output, capacitors 32 and 33 for smoothing the DC intermediate output, and output side power for switching the DC intermediate output to obtain a single-phase AC output at output terminals 303 and 304. The power supply units 10, 20, and 30 have input terminals and output terminals connected to each other. Although not shown, storage batteries are connected in parallel to the capacitors 12, 13, 22, 23, 32, and 33 of the power supply units 10, 20, and 30, and the single-phase AC output is uninterrupted.
[0004]
However, although the power supply units 10, 20, and 30 described above can be used to convert single-phase AC power from a single-phase AC power source into uninterruptible single-phase AC output, the three-phase AC power from the three-phase AC power source can be used. In order to convert the power into an uninterrupted three-phase AC output, as shown in FIG. 6, the R-phase power and the S-phase power from the three-phase AC power supply are input to the input terminals 101 and 102 of the power supply unit 10. The three-phase AC output U-phase power and V-phase power are obtained at the output terminals 103 and 104, and the S-phase power and T-phase power from the three-phase AC power supply are input to the input terminals 201 and 202 of the power supply unit 20, respectively. Three-phase AC output V-phase power and W-phase power are obtained at the output terminals 203 and 204, and T-phase power and R-phase power from the three-phase AC power supply are input to the input terminals 301 and 302 of the power supply unit 30, respectively. Terminals 303 and 304 have three-phase AC output W-phase power If you try to configure it with Δ connection, you will get short circuit between R phase and U phase, S phase and V phase, T phase and W phase, so three phase AC power from three phase AC power supply It was necessary to prepare another power supply unit for converting the power to uninterruptible three-phase AC output.
[0005]
That is, the power supply unit 10A, which has a pair of input terminals 101A and 102A and a pair of output terminals 103A and 104A, and whose input and output are insulated by a commercial transformer 17A, a pair of input terminals 201A and 202A, and a pair of output terminals 203A. 204A, and a power supply unit 20A in which the input and output are insulated by a commercial transformer 27A, a pair of input terminals 301A and 302A, and a pair of output terminals 303A and 304A. The power supply unit is configured as shown in FIG. 4 using an insulated power supply unit 30A, or has a pair of input terminals 101B and 102B and a pair of output terminals 103B and 104B, and the power supply is insulated between the input and output by the high-frequency transformer 17B. Unit 10B, a pair of input terminals 201B and 202B, and a pair of output terminals 203B 204B, and a power supply unit 20B in which the input and output are insulated by the high frequency transformer 27B, a pair of input terminals 301B and 302B, and a pair of output terminals 303B and 304B, and the input and output are insulated by the high frequency transformer 37B. It was necessary to configure as shown in FIG. 5 using the power supply unit 30B.
[0006]
On the other hand, in recent years, the unit type uninterruptible power supply as described above can be dealt with variously only by increasing / decreasing the unit according to the load capacity, and it is necessary to provide the uninterruptible power supply for each load by distributing the load. There is a growing demand for smaller and lighter units.
[0007]
[Problems to be solved by the invention]
The power supply unit 10 having the pair of input terminals 101 and 102 and the pair of output terminals 103 and 104, the power supply unit 20 having the pair of input terminals 201 and 202 and the pair of output terminals 203 and 204, and a pair Since the power supply unit 30 having the input terminals 301 and 302 and the pair of output terminals 303 and 304 does not have a heavy commercial transformer, it can meet the demands for miniaturization and weight reduction. Since it cannot be used to convert the three-phase AC power to the uninterruptible three-phase AC output, there was a problem in terms of versatility.
[0008]
Also, the power supply unit 10A having the pair of input terminals 101A and 102A and the pair of output terminals 103A and 104A, and the power supply unit 20A having the pair of input terminals 201A and 202A and the pair of output terminals 203A and 204A. The power supply unit 30A having a pair of input terminals 301A and 302A and a pair of output terminals 303A and 304A is also used to convert single-phase AC power from a single-phase AC power source into uninterrupted single-phase AC output. Therefore, although there is a heavy commercial transformer 17A, 27A, 37A, although it is preferable in terms of versatility, there is a problem in terms of miniaturization and weight reduction.
[0009]
Further, the power supply unit 10B having the pair of input terminals 101B and 102B and the pair of output terminals 103B and 104B, and the power supply unit 20B having the pair of input terminals 201B and 202B and the pair of output terminals 203B and 204B, as described above. The power supply unit 30B having a pair of input terminals 301B and 302B and a pair of output terminals 303B and 304B is also used to convert single-phase AC power from a single-phase AC power source into uninterrupted single-phase AC output. In addition, since there is no heavy commercial transformer, it is preferable in terms of versatility and miniaturization and weight reduction, but since it is insulated by the high-frequency transformers 17B, 27B, and 37B, the circuit becomes complicated and conversion efficiency is increased. There was a problem in terms of cost.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the invention described in claim 1 is provided with 2n power supply units each having a pair of input terminals and a pair of output terminals, and these 2n power supply units are connected to the input terminals from a three-phase AC power source. R-phase power and S-phase power are input, an R-S phase power is switched to obtain a DC intermediate output, and an input side power conversion unit that switches the DC intermediate output and a three-phase AC output U phase to the output terminal A first power supply block comprising at least one power supply unit having an output-side power conversion unit for obtaining power and V-phase power; and S-phase power and T-phase power from a three-phase AC power supply are input to an input terminal; An input-side power converter that switches between S-T phase power to obtain a DC intermediate output and an output-side power converter that switches the DC intermediate output to obtain V-phase power and W-phase power of a three-phase AC output at the output terminal And having The second power supply block is divided into at least one power supply unit, and the potential of the input terminal to which the S-phase power is input is shared with the potential of the output terminal to which the V-phase power is output. A storage battery connected to a line, the storage battery comprising a first storage battery charged by a DC intermediate output of a first power supply block and a second storage battery charged by a DC intermediate output of the second power supply block; A unit-type uninterruptible power supply, in which one storage battery and a second storage battery are provided for each power supply unit constituting each power supply block, and without using a heavy commercial transformer. When single-phase AC power is input from a single-phase AC power supply without causing problems in terms of conversion efficiency and cost due to the complexity of the 2n power supply units Can be configured to operate in a row to obtain single-phase AC output, and when three-phase AC power is input from a three-phase AC power source, it is configured to operate n power supply units in parallel to obtain three-phase AC output The storage battery connected to the common potential line can be a first storage battery charged by a DC intermediate output of a first power supply block and a second storage battery charged by a DC intermediate output of the second power supply block, By providing the first storage battery and the second storage battery for each power supply unit constituting each power supply block, a storage battery can be mounted for each power supply unit, so that the power supply unit can be easily attached and detached, An apparatus that can easily perform replacement and maintenance management for each power supply unit can be configured.
[0012]
Hereinafter, the present invention will be described based on embodiments.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 are circuit diagrams of the unit type uninterruptible power supply according to the embodiment of the present invention, and the reference numerals thereof are the same as those in FIG.
[0014]
Features of embodiments of the present invention, as shown in FIG. 1, the two power units 10 _1, 10 ₂ and a pair of input terminals 101 and 102 and a pair of output terminals 103 and 104, an input terminal 101 ₁ and 102 ₁ are inputted with R-phase power and S-phase power from a three-phase AC power source, and switch the R-S phase power to obtain a DC intermediate output, and the DC intermediate output and the input-side power converter 11 _1. switching to an output terminal 103 _1, 104 ₁ to the first power supply block 100 ₁ comprised of the power supply unit 10 ₁ and an output-side power converter 14 ₁ to obtain the U-phase power and the V-phase power of the three-phase AC output and The input side power converter 11 ₂ receives the T-phase power and the S-phase power from the three-phase AC power supply to the input terminals 101 ₂ and 102 ₂ , switches the S-T phase power and obtains a DC intermediate output, and the DC Switch on intermediate output To the output terminal 103 _2, 104 the second power supply block 100 ₂ composed of the power supply unit 10 ₂ having ₂ to an output-side power converter 14 ₂ to obtain a W-phase power and the V-phase power of the three-phase AC output In addition, the potentials of the input terminals 102 ₁ and 102 ₂ to which the S-phase power is input and the output terminals 104 ₁ and 104 ₂ to which the V-phase power is output are made common and connected to the common potential line. The storage batteries 15 ₁ , 16 ₁ , 15 ₂ , 16 ₂ are provided.
[0015]
According to the above-described embodiment, the input terminal 101 ₁ to which the R-phase power of the first power supply block 100 ₁ is input, the input terminal 102 ₁ to which the S-phase power is input, the second power supply with respect to the three-phase AC power supply. Since the input terminal 102 ₂ to which the S-phase power of the block 100 ₂ is input and the input terminal 101 ₂ to which the T-phase power is input are configured by V connection, the output capacity is two power supply units 10 ₁ and 10 _2. Single-phase AC power supply without insulation, such as the power supply units 10A, 20A, 30A shown in FIG. 4 and the power supply units 10B, 20B, 30B shown in FIG. It is possible to obtain a unit type uninterruptible power supply that can share a power supply unit that can be used for a three-phase AC power supply.
[0016]
In the embodiment described above, the power supply unit 10 ₂ constituting the power supply unit 10 ₁ and the second power supply block 100 ₂ constituting the first power block 100 ₁ is set to one each, but in this case, the above-mentioned a first accumulator battery 15 _1, 16 ₁ connected to the common potential line is charged by the first DC link output of the power supply block 100 _1, battery 15 ₂ connected to a common potential line, 16 ₂ second Since the second storage battery is charged by the DC intermediate output of the power supply block 100 ₂ , the first storage battery 15 ₁ , 16 ₁ and the second storage battery 15 ₂ , 16 ₂ are provided for each power supply block 100 ₁ , 100 _2. In addition, even if each power supply unit 10 ₁ , 10 ₂ constituting each power supply block 100 ₁ , 100 ₂ is provided, the required number is four sets.
[0017]
On the other hand, in the embodiment shown in FIG. 2, the power supply units constituting the first power supply block 100 ₁ are _n units of 10 ₁ to 10 _n and are connected in parallel, and the second power supply block 100 ₂ is connected. The power supply units constituting _n units of 10 _{n + 1} to 10 _2n are connected in parallel, and the storage batteries 15 ₁ to 15 _n and 16 _{1 to} 16 _n connected to the common potential line are connected to the first power supply block 100. a first battery that is charged by _a DC intermediate output, charging the battery _{15 n + 1 ~15 2n, 16} n + 1 a ~ 16 _2n of the second power supply block 100 ₂ DC intermediate output connected to the common potential line The second storage battery is used. In this embodiment, since it is necessary to provide the storage batteries 15 ₁ to 15 _2n and 16 _{1 to} 16 _2n in the _2n power supply units 10 ₁ to 10 _2n constituting the power supply blocks 100 ₁ and 100 ₂ , 4n sets It is necessary to prepare a storage battery.
[0018]
In the embodiment shown in FIG. 2, the power supply units 10 ₁ to 10 _n constituting the first power supply block 100 ₁ and the power supply units 10 _{n + 1} to 10 _2n constituting the second power supply block 100 ₂ are provided. You may connect as shown in the following FIG.
[0019]
That is, as shown in FIG. 3, n power supply units 10 ₁ constituting the first power supply block 100 ₁ and n power supply units 10 ₂ constituting the second power supply block 100 ₂ are prepared. This is by connecting them in parallel.
[0020]
Therefore, when the first storage battery and the second storage battery are provided for each power supply unit constituting each power supply block 100 ₁ , 100 ₂ , the power supply unit can be easily attached and detached, This is advantageous in that maintenance management can be easily performed.
[0021]
【The invention's effect】
As described above, the present invention converts a three-phase AC power from a three-phase AC power source into an uninterrupted three-phase AC output by using 2n power supply units having a pair of input terminals and a pair of output terminals. Because it is composed of n power supply units, a three-phase uninterruptible power supply can be configured using a power supply unit for a single-phase AC power supply, or an uninterrupted single-phase AC power supply Since it can be configured in the form of parallel operation of units, a unit type uninterruptible power supply device with excellent versatility can be obtained.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a unit type uninterruptible power supply according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of a unit type uninterruptible power supply according to another embodiment of the present invention.
3 is a configuration diagram of a unit type uninterruptible power supply according to another embodiment of FIG. 2;
FIG. 4 is a configuration diagram of a conventional unit-type uninterruptible power supply device that converts three-phase AC power into uninterruptible three-phase AC output.
FIG. 5 is another configuration diagram of a conventional unit type uninterruptible power supply that converts three-phase AC power into uninterruptible three-phase AC output.
FIG. 6 is another configuration diagram of a conventional unit type uninterruptible power supply that converts three-phase AC power into uninterruptible three-phase AC output.
FIG. 7 is a configuration diagram of a unit-type uninterruptible power supply device that converts single-phase AC power into uninterruptible single-phase AC output.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Power supply unit 11 Input side power conversion part 14 Output side power conversion parts 15 and 16 Storage battery 100 Power supply block

Claims (1)

2n power supply units each having a pair of input terminals and a pair of output terminals are provided. The 2n power supply units are supplied with R-phase power and S-phase power from a three-phase AC power source. An input-side power conversion unit that switches the interphase power to obtain a DC intermediate output and an output-side power conversion unit that switches the DC intermediate output and obtains a U-phase power and a V-phase power of a three-phase AC output at an output terminal A first power supply block comprising at least one power supply unit, and an input terminal for receiving S-phase power and T-phase power from a three-phase AC power supply and switching between S-T phase power to obtain a DC intermediate output A second power supply comprising at least one power supply unit having a side power conversion unit and an output side power conversion unit that switches between the DC intermediate output and obtains V-phase power and W-phase power of three-phase AC output at an output terminal Thereby divided into a lock, the potential of the output terminal potential and the V-phase power input terminal to which the S-phase power is input is output to the common, with a connected battery to the common potential line, said battery Consists of a first storage battery charged by the DC intermediate output of the first power supply block and a second storage battery charged by the DC intermediate output of the second power supply block, and the first storage battery and the second storage battery are connected to each power supply block. A unit-type uninterruptible power supply, characterized in that it is provided for each power supply unit constituting the unit .

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