JP2008259296A - Uninterruptible power supply equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide reliable uninterruptible power supply equipment by discriminating only a storage battery where the abnormality by deterioration is detected by monitoring the state of every storage battery, interlocking it with an automatic storage battery deterioration diagnosis function. <P>SOLUTION: The uninterruptible power supply equipment includes an uninterruptible power supply facility main body 1 which has a converter 2 that converts the input power from an AC power source into DC power and an inverter 3 that converts the DC power output from the converter 2 again into AC power and outputs it to a load apparatus 4, a plurality of storage batteries 5 which are connected in series to a DC power part between the converter 2 and the inverter 3 and supplies power to the load apparatus 4 even at abnormality of an AC power source, an automatic storage battery deterioration diagnosing means 8 which performs the automatic storage battery deterioration diagnosis to detect the abnormality as the whole of the plurality of storage batteries 5 by discharging the plurality of storage batteries 5 as a test, and an individual storage battery deterioration diagnosing means 31 which detects only a storage battery 5 whose voltage has dropped to a set value or under out of the plurality of storage batteries 5 at test discharge, interlocking with the automatic storage battery deterioration diagnosing means 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an uninterruptible power supply facility equipped with an uninterruptible power supply device that supplies backup power for computer equipment or the like that is greatly affected by a power failure, and particularly to an uninterruptible power supply facility equipped with an automatic storage battery deterioration diagnosis function It is.

  AC uninterruptible power supply with an accumulator such as a storage battery as a backup power source for load devices such as computers that cause unnecessary operation, malfunction, or system down in the event of a power failure such as a power failure or instantaneous voltage drop of an AC input power supply Power supply devices (UPS) are widely used for the purpose of supplying stable AC power. In particular, due to its application to important systems such as Internet data centers in recent years, the demand for reliability for uninterruptible power supplies is high, and even storage batteries that release energy due to power outages or instantaneous voltage drops are at an early stage of deterioration. It is desired to realize an uninterruptible power supply facility that allows replacement of each storage battery that has deteriorated before the energy storage body in which a plurality of storage batteries are connected in series impairs performance.

  Here, as a method of detecting the deterioration of the storage battery, the storage battery is automatically discharged by generating a test signal from the uninterruptible power supply, and the storage battery abnormality detection circuit determines the presence or absence of the discharge current to determine whether the storage battery is normal or abnormal. A method of discrimination is shown (for example, Patent Document 1).

JP-A-8-256439

  However, the one disclosed in Patent Document 1 determines normality or abnormality by determining the presence or absence of a discharge current in a state where a plurality of storage batteries are connected in series, that is, depending on the deterioration state of each storage battery. It does not detect abnormalities.

  This invention was made in order to solve the above-mentioned problems, and the purpose thereof is an uninterruptible power supply facility equipped with an automatic storage battery deterioration diagnosis function, and the state of each storage battery in conjunction with the automatic storage battery deterioration diagnosis function. Is to determine only the storage battery in which an abnormality due to deterioration is detected, and to provide a highly reliable uninterruptible power supply facility.

  An uninterruptible power supply facility according to the present invention includes a converter that converts input power from an AC power source into DC power, and an inverter that converts the DC power output from the converter into AC power again and outputs the AC power to a load device. A plurality of storage batteries that are connected in series to a DC power unit between the power failure power supply main body and the converter and the inverter, and supply power to the load device even when the AC power supply is abnormal, and test discharge to the plurality of storage batteries Automatic storage battery deterioration diagnosis means for performing an automatic storage battery deterioration diagnosis for detecting an abnormality of the plurality of storage batteries as a whole, and the automatic storage battery deterioration diagnosis means in conjunction with the automatic storage battery deterioration diagnosis means. And an individual storage battery deterioration diagnosis means for detecting only a lowered storage battery as an abnormality.

  The present invention includes an uninterruptible power supply main body having a converter that converts input power from an AC power source into DC power, and an inverter that converts the DC power output from the converter into AC power again and outputs it to a load device, A plurality of storage batteries that are connected in series to a DC power unit between the converter and the inverter and supply power to the load device even when the AC power supply is abnormal, and the plurality of storage batteries are subjected to test discharge so that the whole of the plurality of storage batteries Automatic storage battery deterioration diagnosis means for performing an automatic storage battery deterioration diagnosis for detecting an abnormality as an abnormality, and in conjunction with the automatic storage battery deterioration diagnosis means, only the storage battery whose voltage drops below a set value during the test discharge is abnormal Power storage in conjunction with the automatic storage battery deterioration diagnosis function. Monitors the state of each, determine only the storage battery abnormality due to deterioration is detected, it is possible to provide a highly reliable uninterruptible power supply system.

  In order to explain the present invention in more detail, it will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic block diagram showing an uninterruptible power supply facility according to Embodiment 1 of the present invention, and FIG. 2 is a series connection of a plurality of test discharges performed in the uninterruptible power supply facility according to Embodiment 1 of the present invention. FIG. 3 is a circuit configuration diagram showing details of a deterioration diagnosis (display) board and a deterioration diagnosis interface board of the uninterruptible power supply according to Embodiment 1 of the present invention.

  The circuit configuration of the uninterruptible power supply facility shown in FIG. 1 is known. The uninterruptible power supply main unit 1 converts input power from an AC power supply (not shown) into DC power by the converter 2, converts it again to AC power by the inverter 3, and outputs stable power to the load device 4. The storage battery 5, which is a multiple energy storage body connected in series to the DC power section between the converter 2 and the inverter 3, supplies stable power to the load device 4 even when an AC power failure or instantaneous voltage drop occurs. To do. In FIG. 1, the storage battery 5 is housed in the storage battery panel 6, but may be built in the uninterruptible power supply main body 1. Further, the uninterruptible power supply main body 1 is provided with an automatic storage battery deterioration diagnosis means 8 having an automatic storage battery deterioration diagnosis function and provided with a discharge current detector 7. Although not shown in detail, when the automatic storage battery deterioration diagnosis means 8 operates, the test discharge from the storage battery 5 is performed by making the input power amount of the converter 2 lower than the output power amount of the inverter 3. . The test discharge time is short, and it is determined that the discharge current detector 7 has no discharge current, and when the abnormality of the plurality of storage batteries 5 as a whole is detected, the input power amount of the converter 2 is increased. The uninterruptible power supply main body 1 does not stop due to failure and continues to supply stable AC power. Further, the uninterruptible power supply main body 1 is configured with a bypass circuit by a bypass switch 9 so that AC power can be output even when the inverter 3 or the like is abnormal, and a stable supply of AC power to the load device 4 is ensured. It is supposed to be.

  Next, FIG. 2 shows a change in the state of the floating charge voltage of the plurality of series-connected storage batteries 5 as a whole at the time of test discharge by the automatic storage battery deterioration diagnosis means 8. In general, when the storage battery 5 is deteriorated, the floating charge voltage is significantly reduced during discharging, and the storage battery malfunctions when there is no discharge current, which is a typical example of the end of life or failure of the storage battery 5 itself. In the case of the time waveform 11, the floating charging voltage is reduced to the abnormality determination voltage during the test discharge, and the discharge current detector 5 can detect and determine the abnormality of the plurality of storage batteries 5 as a whole. On the other hand, in the storage battery normal waveform 12, which is a typical example of the initial and middle stages of deterioration of the storage battery 5, the decrease in the floating charge voltage at the time of discharge is very small, so that the floating charge voltage reaches the abnormality determination voltage even at the end of the test discharge. The discharge current detector 5 cannot detect and discriminate the abnormality of the plurality of storage batteries 5 as a whole. Therefore, with the circuit configuration of the uninterruptible power supply facility of the present invention shown in FIG. 3, an abnormality that cannot be detected as a whole of the plurality of storage batteries 5 in the storage battery normal waveform 12 is detected for each storage battery 5.

  FIG. 3 shows details relating to the connection between the uninterruptible power supply main body 1 and the storage battery 5. In FIG. 3, for example, a plurality of storage batteries 5 are connected in series in the storage battery panel 6. Here, reference numeral 21 denotes a deterioration diagnosis interface board provided in the uninterruptible power supply main body 1, and includes a control power supply 22 as a drive power supply, a deterioration diagnosis signal relay 23, and a reset button 24 therein. Reference numeral 25 denotes a deterioration diagnosis (display) board provided in the vicinity of the storage battery 5 in the storage battery panel 6, and a plurality of deterioration determination value setting circuits 26 connected to each storage battery 5 and a photocoupler 27 therein. A plurality of deterioration display LEDs 28, a deterioration determination value setting circuit driving relay 29, and an LED holding relay 30 connected to each deterioration determination value setting circuit 26 are provided. By these, the individual storage battery deterioration diagnosis means 31 of the uninterruptible power supply equipment of this invention is comprised. Hereinafter, the operation of the individual storage battery deterioration diagnosis means 31 will be described.

  When the automatic storage battery deterioration diagnosis means 8 generates a test signal consisting of a state signal for starting automatic storage battery deterioration diagnosis, the deterioration diagnosis signal relay 23 receives and drives the signal, and the contact 23a is turned on. Then, the degradation determination value setting circuit driving relay 29 having two drive units is driven by being fed with power from a control power source 22 as a drive power source, and contacts 29a and 29b in the degradation determination value setting circuit 26 are turned on. Thus, the deterioration judgment value setting circuit 26 becomes operable. Thereafter, when the automatic storage battery deterioration diagnosis means 8 starts test discharge in the storage battery 5 in this state, a plurality of storage batteries 5 as shown in the storage battery normal waveform 12 in FIG. The overall voltage is reduced. At this time, each deterioration determination value setting circuit 26 detects a voltage drop for each storage battery 5. That is, among the plurality of storage batteries 5, if there is a storage battery 5 whose voltage drops below a set value determined as an abnormal voltage value set in advance based on the circuit constant of the deterioration determination value setting circuit 26, this is handled. Only the photocoupler 27 operates and turns on the deterioration display LED 28. Thereby, display of the deteriorated storage battery 5 is performed. At this time, if any of the deterioration display LEDs 28 is lit, the LED holding relay 30 is driven and the contact 30a is turned on. Therefore, even after the automatic storage battery deterioration diagnosis means 8 stops the test discharge of the storage battery 5, the deterioration display LED 28 is supplied with power from the control power supply 22 until the reset button 24 is released by the display reset operation, and maintains the lighting state. That is, as explained above, the individual storage battery deterioration diagnosis means 31 is linked with the automatic storage battery deterioration diagnosis means 8 only in the storage battery 5 whose voltage drops below the set value among the plurality of storage batteries 5 during the test discharge of the storage battery 5. Is detected as abnormal.

  Therefore, in the first embodiment, in the test discharge, the deterioration at the initial stage and the middle stage of each storage battery 5 that could not be detected only by the conventional automatic storage battery deterioration diagnosis means 8 is detected, and only this storage battery 5 is determined as abnormal. It is possible to specify. Further, instead of detecting abnormality of a plurality of storage batteries 5 at the same time due to the presence or absence of the discharge current of the storage battery 5, the set value of abnormality detection can be set individually and based on the circuit constant of the deterioration determination value setting circuit 26, and reliability can be improved. High uninterrupted power supply facilities are realized. Furthermore, since the storage battery 5 that has become abnormal is displayed individually by turning on the deterioration display LED 28, the deteriorated storage battery 5 can be discriminated and can be quickly replaced. Therefore, the service stop time of the uninterruptible power supply facility accompanying the abnormality of the storage battery 5 can be provided in the shortest time.

Embodiment 2. FIG.
FIG. 4 is a circuit configuration diagram showing details of a deterioration diagnosis (display) board and a deterioration diagnosis interface board of the uninterruptible power supply facility according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 1, or an equivalent, and description is abbreviate | omitted.

  In the first embodiment, the storage battery 5 has the individual storage battery deterioration diagnosis means 31 including the deterioration determination value setting circuit 26 for each one. Therefore, the degree setting of the storage battery deterioration diagnosis is limited to one. On the other hand, in the second embodiment, as shown in FIG. 4, the storage battery 5 has a plurality of deterioration judgment value setting circuits 261 and 262 having different circuit constants for each one, and photocouplers 271 and 272 corresponding thereto. In addition, the deterioration display LEDs 281 and 282 and the display function are also increased, and the degree setting of the storage battery deterioration diagnosis is made fine. In addition, contacts 291a, 291b and 292a, 292b of the deterioration determination value circuit driving relay 29 are provided in the deterioration determination value setting circuits 261 and 262, respectively. In this case, the individual storage battery deterioration diagnosis means 31 detects a plurality of abnormal voltages stepwise according to the voltage drop level of each storage battery 5.

  Therefore, in the second embodiment, it is possible to detect the failure or deterioration of the storage battery 5 at an early stage, and to provide a more reliable uninterruptible power supply facility. In FIG. 4, the number of deterioration determination value setting circuits 261 and the like and the deterioration display LED 281 and the like are configured in two sets per storage battery 5, but may be configured in a larger number.

Embodiment 3 FIG.
FIG. 5 is a circuit configuration diagram showing details of the deterioration diagnosis (display) board and deterioration diagnosis interface board of the uninterruptible power supply in Embodiment 3 of the present invention, and FIG. 6 is an equivalent circuit of the storage battery in Embodiment 3 of the present invention. It is a figure which shows the circuit constant of a deterioration determination value setting circuit. In addition, the same code | symbol is attached | subjected to FIG.

  In the configuration of the uninterruptible power supply facility shown in the first or second embodiment, the deterioration state is determined by detecting the voltage drop of each storage battery 5 as an abnormality. As a method for diagnosing the deterioration of the storage battery 5, it is possible to grasp the deterioration state by an increase in the impedance value inside the storage battery 5 in addition to the method that is performed by changing the voltage value. As shown in FIG. 5, the uninterruptible power supply facility shown in the third embodiment improves the determination accuracy of the storage battery 5 failure and deterioration by calculating and grasping the impedance value. Hereinafter, the uninterruptible power supply in Embodiment 3 will be described in detail.

  As shown in FIG. 5, in the third embodiment, in addition to the configuration of the second embodiment, the uninterruptible power supply main unit 1 includes a discharge current measuring circuit 41 that measures the discharge current of the storage battery at the time of test discharge, A storage battery internal impedance calculation circuit 42 that calculates the detected internal impedance of the storage battery and a storage battery internal impedance display circuit 43 that displays the calculated value are provided. Further, the deterioration diagnosis interface board 21 has internal impedance calculation relays 44 and 45. Here, in the third embodiment, the configuration on the storage battery 5 side is substantially the same as that in FIG. 4 in the second embodiment, and has a plurality of deterioration judgment value setting circuits 261 and 262, deterioration display LEDs 281 and 282, and the like. Yes. However, the deterioration display LEDs 281 and 282 are connected to the control power source 22 via the LED holding relays 301 and 302 and the internal impedance calculation relays 44 and 45 by separate wirings. That is, when both or one of the deterioration display LEDs 281 and 282 is turned on according to the voltage drop level, both or one of the contacts 301a and 302b of the LED holding relays 301 and 302 is turned on correspondingly, and the internal impedance calculation is performed. Both or one of the relays 44 and 45 is driven, and both or one of the contacts 44a and 45a is turned on. A signal indicating that both or one of the contacts 44a and 45a is turned on is transmitted to the storage battery internal impedance calculation circuit 42. In FIG. 5, the number of deterioration determination value setting circuits 261 and the like and the deterioration display LED 281 and the like are configured in two sets for each storage battery 5, but may be configured in a larger number.

Next, the operation of the uninterruptible power supply in Embodiment 3 will be described. In the circuit configuration of FIG. 5, when the abnormal storage battery 5 is detected by the individual storage battery deterioration diagnosis means 31 when the automatic storage battery deterioration diagnosis means 8 causes the storage battery 5 to perform test discharge during the automatic storage battery deterioration diagnosis, the storage battery internal impedance calculation is performed. The circuit 42 receives a signal indicating that both or one of the contacts 44 a and 45 a of the internal impedance calculation relays 44 and 45 has been turned on, and the discharge current value of the storage battery 5 measured by the discharge current measuring circuit 41. Based on this reception information, the abnormal storage battery 5 is calculated using the equations (1) to (3) from the voltage dividing resistors of the first resistor 46 and the second resistor 47 based on the equivalent circuit of FIG. The value of the internal impedance R1 is calculated. The calculated value can be confirmed by the storage battery internal impedance display circuit 43. Regarding the determination criteria for the internal impedance value of the storage battery 5, since there is data provided by the manufacturer of the storage battery 5, the abnormality of the storage battery 5 is determined by comparing with the data.
R1 = (E1-V1) / i (1)
V1 = V2 (R101 + R102) / R102 (2)
E1 = E0 / Total number of storage batteries (3)
here,
R1: Storage battery internal impedance
i: discharge current during test discharge E0: storage battery (total) voltage during floating charge E1: single storage battery voltage during floating charge V1: single storage battery voltage during test discharge V2: deterioration determination value setting voltage of single storage battery R101: first Voltage dividing resistance of one resistor R102: Voltage dividing resistance of the second resistor.
The deterioration determination value setting voltage V2 of the single storage battery, and the voltage dividing resistors R101 and R102 of the first resistor and the second resistor are the deterioration determination value setting circuits 261 and 262 according to the voltage drop level of the storage battery 5 at the time of abnormality. One of these values is used.

  Therefore, in the third embodiment, in addition to the effects of the second embodiment, it is possible to provide an uninterruptible power supply facility in which the determination accuracy of the storage battery 5 failure or deterioration is improved.

It is a schematic block diagram which shows the uninterruptible power supply equipment in Embodiment 1 of this invention. It is a figure which shows the voltage as the whole storage battery connected in series when the test discharge is performed in the uninterruptible power supply equipment in Embodiment 1 of this invention. It is a circuit block diagram which shows the detail of the deterioration diagnosis (display) board | substrate and deterioration diagnosis interface board | substrate of an uninterruptible power supply equipment in Embodiment 1 of this invention. It is a circuit block diagram which shows the detail of the deterioration diagnosis (display) board | substrate and deterioration diagnosis interface board | substrate of an uninterruptible power supply equipment in Embodiment 2 of this invention. It is a circuit block diagram which shows the detail of the deterioration diagnosis (display) board | substrate and deterioration diagnosis interface board | substrate of an uninterruptible power supply equipment in Embodiment 3 of this invention. It is a figure which shows the circuit constant of the equivalent circuit of a storage battery in Embodiment 3 of this invention, and a deterioration determination value setting circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Uninterruptible power supply main body 2 Converter 3 Inverter 4 Load apparatus 5 Storage battery 6 Storage battery board 7 Discharge current detector 8 Automatic storage battery deterioration diagnostic means 9 Bypass switch 11 Storage battery abnormality waveform 12 Storage battery normal waveform 21 Deterioration diagnosis interface board 22 Control power supply 23 Degradation diagnosis signal relay 23a Contact 24 Reset button 25 Degradation diagnosis (display) board 26 Degradation judgment value setting circuit 27 Photocoupler 28 Degradation display LED
29 Degradation judgment value setting circuit driving relays 29a, 29b Contact 30 LED holding relay 31 Individual storage battery deterioration diagnosis means 41 Discharge current measuring circuit 42 Storage battery internal impedance calculation circuit 43 Storage battery internal impedance display circuit 44, 45 Internal impedance calculation relay 44a, 45a Contact 46 First resistor 47 Second resistor 261, 262 Degradation judgment value setting circuit 271, 272 Photocoupler 281, 282 Degradation display LED
291a, 291b contact 292a, 292b contact 301, 302 LED holding relay 301a, 302b contact

Claims (8)

An uninterruptible power supply main body having a converter that converts input power from an AC power source into DC power, and an inverter that converts the DC power output from the converter into AC power and outputs the AC power to load equipment;
A plurality of storage batteries connected in series to a DC power unit between the converter and the inverter, and supplying power to the load device even when the AC power supply is abnormal,
Automatic storage battery deterioration diagnosis means for performing an automatic storage battery deterioration diagnosis for detecting an abnormality as the whole of the plurality of storage batteries by causing the plurality of storage batteries to perform test discharge;
In conjunction with the automatic storage battery deterioration diagnosis means, individual storage battery deterioration diagnosis means for detecting only a storage battery whose voltage has dropped below a set value among the plurality of storage batteries during the test discharge,
An uninterruptible power supply facility characterized by comprising Individual battery deterioration diagnosis means
A plurality of deterioration determination value setting circuits that are connected to each storage battery and operate so as to be determined to be abnormal when the voltage of the storage battery drops below a preset setting value at the time of test discharge;
A plurality of deterioration indicator LEDs connected to each of the deterioration determination value setting circuits and displaying the storage battery that has been turned on and deteriorated when the storage battery is determined to be abnormal by the deterioration determination value setting circuit;
The uninterruptible power supply equipment according to claim 1 characterized by things. Individual battery deterioration diagnosis means
Control power,
A deterioration diagnosis signal relay in which the automatic storage battery deterioration diagnosis means receives a state signal for starting automatic storage battery deterioration diagnosis and the contact is turned on;
Degradation judgment enabling operation of the deterioration judgment value setting circuit by turning on the contact within the deterioration judgment value setting circuit driven by power supplied from the control power source when the contact of the deterioration diagnosis signal relay is turned on A relay for driving a value setting circuit;
With
The uninterruptible power supply system according to claim 2, wherein the automatic storage battery deterioration diagnosis means causes the storage battery to perform test discharge after the deterioration determination value setting circuit becomes operable.   The individual storage battery deterioration diagnosis means includes an LED holding relay that is turned on when any of the deterioration display LEDs is lit, and that maintains the deterioration display LEDs even after the automatic storage battery deterioration diagnosis means stops the test discharge. The uninterruptible power supply equipment according to any one of claims 2 to 3, wherein   5. The uninterruptible power supply according to claim 4, wherein the individual battery deterioration diagnosis means includes a reset button for maintaining the deterioration display LED on until a display reset operation is performed. The deterioration diagnosis signal relay and the reset button are arranged on a deterioration diagnosis interface board provided in the uninterruptible power supply main body,
6. The uninterruptible power supply system according to claim 5, wherein the deterioration determination value setting circuit, the deterioration display LED, and the deterioration determination value setting circuit driving relay are arranged on a deterioration diagnosis display board provided in the vicinity of a plurality of storage batteries.   The individual storage battery deterioration diagnosis means is connected in a plurality for each storage battery, and detects a plurality of abnormal voltages stepwise according to the voltage drop level of each storage battery. Uninterruptible power supply equipment. A discharge current measuring circuit for measuring the discharge current of the storage battery at the time of test discharge;
A storage battery internal impedance calculation circuit that calculates the internal impedance of the storage battery detected as abnormal based on the discharge current measured by the discharge current measurement unit;
A storage battery internal impedance display circuit for displaying the internal impedance calculation value calculated by the storage battery internal impedance calculation circuit;
The uninterruptible power supply equipment according to any one of claims 1 to 7, characterized by comprising:

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