JP2000152521A - Flywheel type uninterruptible power supply parallel operation system and operation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flywheel type uninterruptible power supply parallel operation system and an operating method, capable of reducing the power storage capacity of a single flywheel module further than conventional ones. SOLUTION: Power supply to a load 3 is conducted with only one from among a plurality of flywheel modules 21, 22, 23 when there is power failure in a commercial power source 1, with the motor generators and the power converters in other flywheel modules kept from being energized. When the residual power amount of the flywheel module conducting power supply reaches the supply limit, one from among other flywheel modules conducts power supply. The power supply is always conducted with one module alone and the other flywheel modules are controlled not so as to be energized by a parallel operation control device 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel type uninterruptible power supply parallel operation system and an operation method for supplying power to a computer or the like at the time of a power failure.

[0002]

2. Description of the Related Art The configuration of a conventional flywheel type uninterruptible power supply parallel operation system B is shown in FIG.

In the figure, 1 is a commercial power supply, 2 is a switch, 3 is a load, 4 is a power failure detector, 10 'is a parallel operation controller, 1
1 is a current detector, 21 ', 22' and 23 'are flywheel modules, 101', 201 'and 301' are flywheels, 102 ', 202' and 302 'are motor / generators, 103' and 203 '. , 303 'are power converters. The flywheel module 21 'includes a flywheel 101', an electric / generator 102 ', and a power converter 10.
3 ', the flywheel module 22'
Is a flywheel 201 ′, an electric / generator 202 ′,
The flywheel module 23 'comprises a power converter 203', a flywheel 301 ', a motor / generator 302', and a power converter 303 '. The flywheel modules 21 ′, 22 ′, 23 ′ are connected in parallel with each other, in parallel with the load, and in parallel with the commercial power supply 1 via the switch 2.

FIG. 4 is a flowchart showing the operation of the parallel operation control device 10 'of FIG.

The operation of the conventional flywheel type uninterruptible power supply parallel operation system B will be described below with reference to FIGS.

When the commercial power supply 1 is normal, the power failure detector 4
S_fIs set to 0, and the parallel operation control device 10 '_w0And 1
Then, the switch 2 is closed and the commercial power supply 1
Power is supplied to the load 3. In addition, the parallel operation control device 1
0 'is M'₁, M '_Two, M ' _ThreeAre all 0, and this
Therefore, power converters 103 ', 203', and 303 'are all
To charge mode, flywheel module 2
1 ', 22', and 23 'are charged by the commercial power supply 1.

When the commercial power supply 1 loses power, the power failure detector 4
S_fIs set to 1 and the parallel operation control device 10 '_w0And 0
Then, the switch 2 is opened. Also, parallel operation
The control device 10 'is M'₁, M '_Two, M '_ThreeAnd all 1
Thereby, the power converters 103 ', 203', 30
3 'are all in the discharge mode. Of these, power converters
103 'operates as a constant voltage source and requires load 3
Outputs a constant voltage. On the other hand, the current detector 11
I_loadAnd I_loadEnters the parallel operation control device 10 '.
Is forced. The parallel operation control device 10 '_loadThe fly ho
Power conversion by dividing by 3 which is the number of eel modules
Output current reference I of switches 203 'and 303' _r2, I_r3As
Output. Power converters 203 'and 303'
Force current reference I_r2, I_r3Outputs a current equal to

[0008] By the above operation, at the time of commercial power failure,
The load 3 is a flywheel module 21 ', 22', 2
Powered by 3 '.

[0009]

In the conventional flywheel type uninterruptible power supply parallel operation system, all the flywheel modules supply power at the time of commercial power outage, so that the power for driving the power converter is reduced. In addition, electric power for exciting the motor / generator is always consumed as fixed loss. For example, among the fixed losses that do not depend on the output power of each flywheel module, the power for driving the power converter and the excitation of the motor / generator is 40 W, and the other rotation loss is 30 W. The loss depending on the output power is 30 W at 1 kW output and 10 W at 333.3 W output. In the conventional system, when three flywheel modules are operated in parallel to supply power to a load of 1 kW, the power consumption of one flywheel module is 3 power supplied to the load.
33.3W, the total loss is 80W. Therefore,
The power storage capacity of the flywheel module alone required to supply power for 3 hours is 1240 Wh. On the other hand, the amount of power required for the load is 3 kWh, and simply dividing by 3 gives
It suffices if 1 kWh can be supplied per flywheel module. Since the total loss at the time of supplying 1 kW of the flywheel module alone is 100 W, it is sufficient that the flywheel module has a power storage capacity of 1100 Wh, but a power storage capacity of 140 Wh larger than that is required. As described above, in the conventional flywheel type uninterruptible power supply parallel operation system, the power storage capacity of the flywheel module alone must be designed to be large, and there is a problem that the apparatus cost increases and the installation space increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a flywheel type uninterruptible power supply parallel operation system and an operation method capable of reducing the power storage capacity of a flywheel module alone as compared with the conventional one. I do.

[0011]

To achieve the above object, a flywheel type uninterruptible power supply parallel operation system of the present invention is connected in parallel to a commercial power supply and a load, and includes a flywheel, an electric / generator, and an electric power generator. A plurality of flywheel modules comprising a converter, a power failure detector for detecting a power failure of the commercial power supply, and a switch for switching between charging and non-charging from the commercial power supply to the flywheel module,
A remaining amount detector for detecting an amount of remaining power of each of the flywheels; a switch connected to each of the flywheel modules to switch between discharge and non-discharge from each of the flywheel modules to the load; A parallel operation control device that receives signals from the detector and the remaining amount detector and controls each of the switches and the power converter.

The present invention also provides a flywheel type uninterruptible power supply comprising a flywheel, a motor / generator, and a power converter, wherein a plurality of flywheel modules charged from a commercial power supply and supplying power to a load are connected in parallel. In the power supply parallel operation method, at the time of commercial power failure, only one of the plurality of flywheel modules supplies power to the load, and the motor / generator and the power converter in the other flywheel modules are not energized. When the remaining power of the flywheel module that supplies power reaches the supply limit, only one of the other flywheel modules supplies power, so that only one flywheel module supplies power at all times. The flywheel module is controlled by a parallel operation control device so as not to be energized.

Since the present invention employs the above-described novel means, it is possible to suppress the power consumption for driving the power converter of the flywheel module and exciting the motor / generator when the commercial power supply is interrupted. The power storage capacity of the flywheel module alone can be made smaller than before.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a flywheel type uninterruptible power supply parallel operation system A according to an embodiment of the present invention. In the figure, 10 is a parallel operation control device, 21,
22 and 23 are flywheel modules, 101 and 20
1, 301 is a flywheel, 102, 202, 302
Is a motor / generator, 103, 203, 303 are power converters, 104, 204 are remaining amount detectors, 105, 205, 3
05 is a switch. The same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals, and redundant description is omitted. The flywheel module 21 includes a flywheel 101, an electric / generator 102, and a power converter 103, and the flywheel module 22 includes a flywheel 201,
It is composed of a motor / generator 202 and a power converter 203,
The flywheel module 23 includes a flywheel 30
1, the motor / generator 302 and the power converter 303, respectively. Flywheel modules 21, 22,
Reference numerals 23 are connected in parallel with each other, in parallel with the load 3, and in parallel with the commercial power supply 1 via the switch 2.

FIG. 2 is a flowchart showing the operation of the parallel operation control device 10 of FIG.

The operation of the flywheel type uninterruptible power supply parallel operation system A according to one embodiment of the present invention will be described below with reference to FIGS.

When the commercial power supply 1 is normal, the power failure detector 4 sets _Sf to 0, and the parallel operation control device 10 sets S _w0 , S _w1 , S _w
w2 and _Sw3 are all set to 1 so that switches 2, 10
5, 205, and 305 are all closed, and power is supplied from the commercial power supply 1 to the load 3. In addition, the parallel operation control device 1
A value of 0 sets S _p1 , S _p2 , and S _p3 to 1, thereby turning on the drive power of the power converters 103, 203, and 303, and also energizing the motor / generators 102, 202, and 302. Further, the parallel operation control device 10 has M ₁ ,
M ₂ and M ₃ are all set to 0, whereby the power converter 10
3, 203 and 303 are all in the charging mode, and the flywheel modules 21, 22, and 23 are charged by the commercial power supply 1.

When the commercial power source 1 fails, the power failure detector 4 sets _Sf to 1, and the parallel operation control device 10 sets S _w0 , S _w1 , S _w
w2, and S _w3 and each 0,1,0,0, thereby switching 2,205,305 is opened, the closed only switch 105. In addition, the parallel operation control device 10
₁ , M ₂ , and M ₃ are all set to 1, whereby the power converters 103, 203, and 303 all enter the discharge mode,
Control is performed so as to output a constant voltage required by the load 3. However, at the same time, the parallel operation control device 10
_p1, and S _p2, S _p3 Ozorezore 1,0,0, thereby the driving power of the power converter 203, 303 is turned off, not performed yet excitation of the electric-generator 202, 302 , And the load 3 is supplied with power only by the flywheel module 21.

Next, the remaining power detector 104 detects the remaining power _P11 of the flywheel 101. The remaining power amount P _l1 is input to the parallel operation control device 10, and P _l1 is changed to the supply limit P _c1.
, The parallel operation control device 10 sets _Sw2 and _Sp2 to 1, whereby the switch 205 is closed, the driving power supply of the power converter 203 is turned on, and the motor / generator 202 is also excited. Electric power is supplied from the flywheel module 22 to the load 3. The parallel operation control device 10 sets _Sw1 to 0, whereby the switch 105 is opened and the flywheel module 21 is disconnected.

Subsequently, the remaining amount detector 204 detects the remaining power amount P _l2 of the flywheel 201. Residual power amount P _l2
Is input to the parallel operation control unit 10, P _l2 supply limit P
_{When c2} is reached, the parallel operation control device 10 sets _Sw3 and _Sp3 to 1
As a result, the switch 305 is closed, the driving power of the power converter 303 is turned on, and the motor / generator 302 is turned on.
, And power is supplied from the flywheel module 23 to the load 3. In addition, the parallel operation control device 10
_{Sets Sw2} to 0, which causes switch 205 to open,
The flywheel module 22 is disconnected.

According to the above operation, when the commercial power supply fails,
It is possible to always supply power to the load with only one flywheel module and not to supply power to the other flywheel modules.

As described above, among the fixed losses that do not depend on the output power of each flywheel module, the power for driving the power converter and exciting the motor / generator is 40 W, and the other rotation losses are 30 W. . The loss depending on the output power is 30 W at 1 kW output and 10 at 333.3 W output.
W. According to the present invention, when three flywheel modules are operated in parallel to supply power to a 1 kW load during a commercial power outage, the power consumption of one flywheel module is 1 kW of power supplied to the load and the total loss is 1 kW. 100
W. The power consumption when the flywheel module is not energized without supplying power to the load is 30 W. Therefore, the power storage capacity P [Wh] of the flywheel module alone required to supply power for 3 hours needs to satisfy the following expression.

[0024]

(Equation 1)

Here, the first, second, and third terms on the left side of the equation (1) are the times during which the first, second, and third flywheel modules can supply power to the load. In addition, the power consumption of the remaining amount detector was ignored because it was sufficiently smaller than the above loss. By solving the equation (1), P = 1131W
h, which is 109 Wh less power storage capacity than 1240 Wh required in the conventional system.

It goes without saying that power can be supplied by the same operation when the number of flywheel modules is other than three.

[0027]

As described above, according to the present invention, the power storage capacity of a single flywheel module can be made smaller than before, and a flywheel type uninterruptible power supply parallel operation system and operation method with a small device cost and installation space can be achieved. Can be provided.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing an operation of the parallel operation control device of FIG.

FIG. 3 is a configuration explanatory view showing a conventional flywheel type uninterruptible power supply parallel operation system.

FIG. 4 is a flowchart showing an operation of the parallel operation control device of FIG. 3;

[Explanation of symbols]

A, B Flywheel type uninterruptible power supply parallel operation system 1 Commercial power supply 2, 105, 205, 305 Switch 3 Load 4 Power failure detector 10, 10 'Parallel operation control device 11 Current detector 21, 21', 22, 22 ' , 23, 23 'Flywheel module 101, 101', 201, 201 ', 301, 30
1 'Flywheel 102, 102', 202, 202 ', 302, 30
2 'motor / generator 103, 103', 203, 203 ', 303, 30
3 'power converter 104, 204 residual quantity detector

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Owaki 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo F-term in Japan Telegraph and Telephone Corporation (reference) 5G015 FA08 FA16 GA15 GA17 GA20 HA04 HA16 JA10 JA11 JA64

Claims (2)

[Claims] A plurality of flywheel modules connected in parallel to a commercial power supply and a load, the flywheel module including a flywheel, a motor / generator, and a power converter; a power failure detector configured to detect a power failure of the commercial power supply; A switch for switching between charging and non-charging from a commercial power supply to the flywheel module, a remaining amount detector for detecting a remaining power amount of each of the flywheels, and a flywheel connected to each of the flywheel modules. A switch for switching between discharging and non-discharging from the wheel module to the load; and a parallel operation control device that receives signals from the power failure detector and the remaining amount detector and controls the switches and the power converter. A flywheel type uninterruptible power supply parallel operation system characterized by the following. 2. A flywheel type uninterruptible power supply parallel operation comprising a flywheel, a motor / generator, and a power converter, and a plurality of flywheel modules charged from a commercial power supply and supplying power to a load are connected in parallel. In the method, in the event of a commercial power outage, only one of the plurality of flywheel modules supplies power to the load, and the motor / generator and the power converter in the other flywheel modules are not energized, and the power is supplied. When the remaining power of the flywheel module to be supplied reaches the supply limit, only one of the other flywheel modules supplies power, so that only one of the flywheel modules always supplies power. Flywheel type uninterruptible power supply, which is controlled by a parallel operation controller so as not to energize Source parallel operation method.