JP2016059243A - Storage battery controller, storage battery control method, storage battery control program, and power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage battery controller, storage battery control method, storage battery control program, and power supply system capable of reducing, in the case of using a plurality of storage batteries, operation and time required in performing connection of another storage battery.SOLUTION: A storage battery controller includes a determination voltage calculation unit and a connection determination unit. The determination voltage calculation unit, when having received an instruction to make a storage battery bank not connected to a power converter be connected to the power converter, calculates a voltage range for determining the propriety of the connection, on the basis of a voltage of a storage battery bank already connected to the power converter. The connection determination unit, when a voltage of a storage battery bank specified by the instruction is within the voltage range, closes a first switch corresponding to the storage battery bank to make the storage battery bank be connected to the power converter; and, when the voltage is lower than the voltage range, closes a second switch corresponding to the storage battery bank to make the storage battery bank be connected to a charger and, when the voltage becomes within the voltage range, opens the second switch before closing the first switch to make the storage battery bank be connected to the power converter.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a storage battery control device, a storage battery control method, a storage battery control program, and a power supply system.

  In the storage battery, a plurality of storage batteries are connected in series or in parallel depending on the voltage and capacity required in the usage situation. When connecting and using a some storage battery, monitoring the voltage of each storage battery and controlling each storage battery is performed. Monitoring is similarly performed when using lithium ion batteries connected in parallel. For example, when a lithium ion battery in which a malfunction or a significant drop in voltage occurs is detected, the lithium ion battery is disconnected from other lithium ion batteries. The above-described management and control prevent the other lithium ion batteries from being affected and the overcurrent from flowing through the lithium ion battery in which the voltage has dropped.

  When the disconnection is executed, a repaired or new lithium ion battery is connected in parallel with another lithium ion battery instead of the disconnected lithium ion battery. When connecting a repaired or new lithium ion battery in parallel with another lithium ion battery, adjust the voltage of the lithium ion battery inserted in parallel to the voltage of the other lithium ion battery connected in parallel. There is a need. Here, juxtaposition means that another lithium ion battery is newly connected in parallel to an already utilized lithium ion battery. This is because if the voltage is inserted with a certain difference or more, the internal resistance of the lithium ion battery is small, so that an overcurrent may flow through the low voltage lithium ion battery. To prevent overcurrent, when installing lithium-ion batteries in parallel, personnel who perform inspection, maintenance, or repairs measure the voltage of each lithium-ion battery and charge the lithium-ion battery as necessary. From the same time. As described above, in a system or apparatus that uses a plurality of storage batteries such as lithium ion batteries connected to each other, there are cases where laborious and time-consuming operations are required when performing maintenance, inspection, or repair of the storage battery.

JP 2013-005677 A

  Problems to be solved by the present invention are a storage battery control device, a storage battery control method, a storage battery control program, and a storage battery control program that can reduce operations and time required when connecting other storage batteries when a plurality of storage batteries are used. It is to provide a power system.

  The storage battery control device of the embodiment is a storage battery control device in a power supply system. The power supply system includes a plurality of storage battery banks, a power converter, a charger, a plurality of first switches, a plurality of second switches, and a storage battery control device. The plurality of storage battery banks include one storage battery or a plurality of storage batteries connected in series. The power converter supplies a current to a load using an alternating current supplied from an alternating current power source and a direct current supplied from a storage battery bank. The charger supplies direct current to the storage battery bank. The first switch is provided for each storage battery bank, and opens and closes the connection between the corresponding storage battery bank and the power converter. The second switch is provided for each storage battery bank, and opens and closes the connection between the corresponding storage battery bank and the charger. The storage battery control device controls the plurality of first switches and the plurality of second switches. In addition, the storage battery control device has a determination voltage calculation unit and a connection determination unit. When the determination voltage calculator receives an instruction to connect a storage battery bank that is not connected to the power converter among the plurality of storage battery banks to the power converter, the determination voltage calculation unit is based on the voltage of the storage battery bank that is already connected to the power converter. A voltage range for determining whether or not connection is possible is calculated. When the voltage of the storage battery bank specified by the instruction is included in the voltage range, the connection determination unit closes the first switch corresponding to the storage battery bank to connect to the power converter, and the voltage of the storage battery bank is the voltage. When the voltage of the storage battery bank is included in the voltage range by closing the second switch corresponding to the storage battery bank and connecting to the charger when the voltage is lower than the range, the second switch is opened after the second switch is opened. 1 switch is closed and connected to the power converter.

1 is a block diagram illustrating a configuration example of a power supply system 100 according to a first embodiment. The block diagram which shows the structure of the storage battery control apparatus 9 in 1st Embodiment. The flowchart which shows the storage battery control process which the storage battery control apparatus 9 performs when inserting the battery bank 4 in parallel. The block diagram which shows the structural example of the power supply system 200 in 2nd Embodiment. The block diagram which shows the structural example of the power supply system 300 in 3rd Embodiment.

  Hereinafter, a storage battery control device, a storage battery control method, a storage battery control program, and a power supply system according to embodiments will be described with reference to the drawings. In the following embodiments, the same reference numerals are assigned to the same operations, and duplicate descriptions are omitted as appropriate.

(First embodiment)
FIG. 1 is a block diagram illustrating a configuration example of a power supply system 100 according to the first embodiment. In the first embodiment, an example of the power supply system 100 is an uninterruptible power supply (UPS) that continues supplying AC power to a load even when input of AC power for commercial use is cut off. Will be described. The power supply system 100 according to the first embodiment is a system for stably supplying a current supplied from a commercial AC power supply 1 to a load. As shown in FIG. 1, the power supply system 100 includes a power converter 2, a charging converter circuit 3, battery banks 4-1 to 4-n, main circuit switches 5-1 to 5-n, and a charging switch 6. -1 to 6-n, voltmeters 7-1 to 7-n, voltmeter 8 and storage battery control device 9 are provided. In the following description, each of the battery banks 4-1 to 4-n, the main circuit switches 5-1 to 5-n, the charging switches 6-1 to 6-n, and the voltmeters 7-1 to 7-n When showing any one, it describes as the battery bank 4, the main circuit switch 5, the charging switch 6, and the voltmeter 7.

  Main circuit switches 5-1 to 5-n, charging switches 6-1 to 6-n, and voltmeters 7-1 to 7-n are provided corresponding to the battery banks 4-1 to 4-n, respectively. It has been. Each of the battery banks 4-1 to 4-n includes one storage battery 41 or a plurality of storage batteries 41 connected in series. Each of the battery banks 4-1 to 4-n is provided with a sensor (not shown) for detecting the state of each storage battery 41. The sensor detects, for example, the temperature and pressure in the storage battery 41. Further, for the storage battery 41, for example, a lithium ion secondary battery or the like is used. Each battery bank 4-1 to 4-n is assigned in advance an identifier that can be uniquely identified.

  The power converter 2 includes a converter circuit 21, an inverter circuit 22, a chopper circuit 23, and a control unit 24. The converter circuit 21 converts the alternating current supplied from the alternating current power source 1 into a direct current of a predetermined voltage and outputs it. The inverter circuit 22 converts the direct current output from the converter circuit 21 into alternating current having a predetermined peak value, period, and waveform. The inverter circuit 22 supplies the alternating current obtained by the conversion to the load.

  The chopper circuit 23 performs any one of the following first, second, and third operations in accordance with control by the control unit 24. In the first operation, the chopper circuit 23 converts the DC voltage output from the converter circuit 21 and outputs it to the main circuit switches 5-1 to 5-n. In the second operation, the chopper circuit 23 converts the direct current output from the battery banks 4-1 to 4-n via the main circuit switches 5-1 to 5-n to a direct current of a predetermined voltage and outputs it. To do. In the third operation, the chopper circuit 23 stops the current between the electric circuit and the main circuit switches 5-1 to 5-n from the converter circuit 21 to the inverter circuit 22 without performing DC voltage conversion.

  The control unit 24 measures the DC voltage output from the converter circuit 21. The control unit 24 controls the chopper circuit 23 to perform the second operation when the measurement result falls below a predetermined voltage. Moreover, the control part 24 performs control which makes the chopper circuit 23 perform 1st operation | movement, when the voltage measured in the voltmeter 8 is less than the predetermined maintenance voltage. By supplying direct current from the chopper circuit 23, the battery banks 4-1 to 4-n are charged. Here, the sustain voltage is a voltage determined in advance based on the configuration of battery banks 4-1 to 4-n in order to keep the capacity stored in battery banks 4-1 to 4-n constant. . The control unit 24 controls the chopper circuit 23 to perform the third operation when the measurement result is equal to or higher than a predetermined voltage and the voltage measured by the voltmeter 8 is equal to or higher than the sustain voltage. I do.

  The power converter 2 charges the battery banks 4-1 to 4-n by the alternating current supplied from the alternating current power supply 1 with the above configuration. The power converter 2 supplies a stable alternating current to the load using the current supplied from the AC power source 1 and the currents from the battery banks 4-1 to 4-n.

  The charging converter circuit 3 converts the alternating current supplied from the alternating current power source 1 into direct current according to the control of the storage battery control device 9 and outputs the direct current to the charging switches 6-1 to 6-n. The battery banks 4-1 to 4-n include one or a plurality of storage batteries 41 as described above. The battery banks 4-1 to 4-n are connected to the power converter 2 via the corresponding main circuit switches 5-1 to 5-n. When the main circuit switches 5-1 to 5-n are turned on, the battery banks 4-1 to 4-n are connected in parallel to each other. Further, the battery banks 4-1 to 4-n are connected to the charging converter circuit 3 via the charging switches 6-1 to 6-n corresponding thereto.

  The main circuit switches 5-1 to 5-n open and close the electric circuit between the corresponding battery banks 4-1 to 4-n and the power converter 2 according to the control of the storage battery control device 9. The charging switches 6-1 to 6-n open and close the electric circuit between the corresponding battery banks 4-1 to 4-n and the charging converter circuit 3 according to the control of the storage battery control device 9. . The main circuit switches 5-1 to 5-n and the charging switches 6-1 to 6-n corresponding to the respective battery banks 4-1 to 4-n are not simultaneously turned on. . That is, the battery banks 4-1 to 4-n are not connected simultaneously with the chopper circuit 23 and the charging converter circuit 3. Each of the battery banks 4-1 to 4-n is removable for maintenance, inspection, repair, or replacement. When the battery bank 4 is removed, the corresponding main circuit switch 5 and charging switch 6 are opened.

  The voltmeter 7-1 measures the voltage at the connection point between the corresponding battery bank 4-1, the main circuit switch 5-1 and the charging switch 6-1. The voltmeter 7-1 outputs the measured voltage value to the storage battery control device 9. Similarly to the voltmeter 7-1, the voltmeters 7-2 to 7-n include battery banks 4-2 to 4-n, main circuit switches 5-2 to 5-n, and charging switches. The voltage at the connection point with the devices 6-2 to 6-n is measured. Each of the voltmeters 7-2 to 7-n outputs the measured voltage value to the storage battery control device 9.

  The voltmeter 8 measures the voltage in the electric circuit between the chopper circuit 23 provided in the power converter 2 and the main circuit switches 5-1 to 5-n. The voltmeter 8 outputs the measured voltage value to the charging converter circuit 3 and the storage battery control device 9. The voltage measured by the voltmeter 8 is a voltage when the battery bank 4 corresponding to the inserted main circuit switch 5 among the main circuit switches 5-1 to 5-n is connected in parallel. .

  The storage battery control device 9 controls the opening and closing of the main circuit switch 5-1 and the opening and closing of the charging switch 6-2. When the storage battery control device 9 detects an abnormality in the battery banks 4-1 to 4-n, the storage battery control device 9 disconnects the battery bank 4 in which the abnormality is detected from the other battery banks 4. Further, when the current is supplied from the charging converter circuit 3 to the battery bank 4 in which the abnormality is detected, the storage battery control device 9 opens the charging switch 6. In addition, when the disconnected battery bank 4 is inserted after being repaired, or when a new battery bank 4 is inserted in place of the disconnected battery bank 4, the storage battery control device 9 The circuit switch 5 and the charging switch 6 are controlled.

  FIG. 2 is a block diagram illustrating a configuration of the storage battery control device 9 according to the first embodiment. As shown in FIG. 2, the storage battery control device 9 includes an abnormality determination unit 91, a main circuit switching control unit 92, a charging switching control unit 93, a determination voltage calculation unit 94, and a connection determination unit 95. Abnormality determination unit 91 detects an abnormality in each battery bank 4-1 to 4-n based on a detection result of a sensor provided in each of battery banks 4-1 to 4-n. For example, when the temperature in the detection result of the sensor is equal to or higher than the reference temperature, or when the pressure in the detection result is equal to or higher than the reference pressure, the abnormality determination unit 91 has a failure or abnormality in the battery bank 4 corresponding to the detection result. It is determined that it has occurred. The abnormality determination unit 91 outputs abnormality information indicating the battery bank 4 determined to have an abnormality to the main circuit opening / closing control unit 92 and the charging opening / closing control unit 93.

  The main circuit switching control unit 92 generates a control signal for controlling the switching of the main circuit switches 5-1 to 5-n and outputs the control signal to the main circuit switches 5-1 to 5-n. The main circuit switching control unit 92 stores the open / closed states of the main circuit switches 5-1 to 5-n. When the main circuit switch 5 corresponding to the battery bank 4 indicated by the abnormality information output from the abnormality determination unit 91 is turned on, the main circuit switch control unit 92 opens the main circuit switch 5. The main circuit switching control unit 92 opens the main circuit switch 5 corresponding to the battery bank 4 determined to have an abnormality, and disconnects the battery bank 4 from the other battery banks 4.

  The charging switch 93 generates a control signal for controlling the switching of the charging switches 6-1 to 6-n, and outputs the control signal to the charging switches 6-1 to 6-n. The charging opening / closing control unit 93 stores the opening / closing states of the charging switches 6-1 to 6-n. When the charging switch 6 corresponding to the battery bank 4 indicated by the abnormality information input from the abnormality determination unit 91 is turned on, the charging switching control unit 93 opens the charging switch 6. The main circuit switching control unit 92 opens the main circuit switch 5 corresponding to the battery bank 4 that is determined to be abnormal, and stops charging the battery bank 4.

Based on the voltage value measured by the voltmeter 8, the determination voltage calculation unit 94 uses the determination voltage V _L and the determination voltage V _H that are used in determining whether or not parallel insertion to the battery bank 4 to be inserted is permitted. calculate. The determination voltages V _L and V _H are calculated as in Expression (1) and Expression (2) using the voltage value (V1) measured by the voltmeter 8, for example.
V _L = V1−ΔV (1)
V _H = V1 + ΔV (2)

ΔV in the formula (1) and the formula (2) is a voltage determined in advance based on the characteristics of the battery bank 4 and is used when another battery bank 4 is connected in parallel to the battery bank 4 connected in parallel. This is a voltage indicating a voltage difference that does not cause an unacceptable overcurrent. The determination voltages V _L and V _H are voltages in a range including the voltage value V1, and a range in which no overcurrent occurs when the battery bank 4 is inserted in parallel with another battery bank 4 connected in parallel. If it is calculated so as to determine the voltage of, it may be calculated by another formula. Note that the voltage range determined by the determination voltages V _L and V _H is a voltage in the range from V _L to V _H.

The connection determination unit 95 receives instruction information for specifying the battery bank 4 to be inserted and voltage values measured by the voltmeters 7-1 to 7-n. For example, when the battery bank 4 is inserted in parallel, the instruction information is input to the connection determination unit 95 by a person who performs inspection or maintenance. Based on the voltage value measured by the voltmeter 7 corresponding to the battery bank 4 to be juxtaposed and the determination voltages V _L and V _H calculated by the determination voltage calculation unit 94, the connection determination unit 95 4 is determined whether connection is possible. When the voltage value at the voltmeter 7 is included in the voltage range determined by the determination voltages V _L and V _H , the connection determination unit 95 switches on the main circuit switch 5 corresponding to the battery bank 4 to be juxtaposed. Information is generated and output to the main circuit switching control unit 92. When the insertion information is input, the main circuit switching control unit 92 inputs the main circuit switch 5 indicated by the insertion information, and causes the battery banks 4 to be inserted in parallel.

When the voltage value at the voltmeter 7 is less than the determination voltage _VL , the connection determination unit 95 generates charging information for switching on the charging switch 6 corresponding to the battery bank 4 to be juxtaposed, and opens and closes the charging. Output to the controller 93. Further, the connection determination unit 95 requests the charging converter circuit 3 to convert the alternating current supplied from the alternating current power source 1 into a direct current and output the direct current to the charging switches 6-1 to 6-n. When the charging information is input, the charging switching control unit 93 switches on the charging switch 6 indicated by the charging information, and charges the battery bank 4 to be juxtaposed with the current output from the charging converter circuit 3. To start. At this time, the DC voltage output by the charging converter circuit 3 is a voltage value measured by the voltmeter 8 or a charging voltage obtained by adding Δv to the voltage value. Here, Δv is a voltage determined in advance based on the charging characteristics of the storage battery 41, and may be the same value as ΔV or a value different from ΔV.

When the voltage of battery bank 4 to be inserted is included in the range of determination voltages V _L and V _H , connection determination unit 95 requests charging converter circuit 3 to convert to DC and stop output. In addition, the connection determination unit 95 generates opening information for opening the charging switch 6 corresponding to the battery bank 4 to be inserted, and outputs the opening information to the charging opening / closing control unit 93. Further, the connection determination unit 95 generates input information for inputting the main circuit switch 5 corresponding to the battery bank 4 to be inserted, and outputs the information to the main circuit switching control unit 92. When the opening information is input, the charging opening / closing control unit 93 opens the charging switch 6 indicated by the opening information and stops charging the battery bank 4 to be juxtaposed. Thereafter, when the input information is input, the main circuit switching control unit 92 inputs the main circuit switch 5 indicated by the insertion information, and causes the battery banks 4 to be inserted to enter in parallel.

FIG. 3 is a flowchart showing a storage battery control process performed by the storage battery control device 9 when the battery bank 4 is inserted in parallel. When the storage battery control process is started in the storage battery control device 9, the determination voltage calculation unit 94 calculates the determination voltages V _L and V _H (step S101). Connection determination unit 95 determines the voltmeter 7 voltage value corresponding to the parallel input target battery banks 4 whether less than the determination voltage V _H (step S102).

If the voltage value of the battery bank 4 is determination voltage _{V H} or (step S102: NO), the connection determination unit 95 terminates the battery control process. In the power supply system 100, the stored capacity of each battery bank 4 connected to the power converter 2 is kept constant by the current supplied from the chopper circuit 23. When the voltage value exceeding this capacity is measured in the battery bank 4 to be juxtaposed, the connection determination unit 95 considers that some abnormality has occurred and ends the storage battery control process without performing juxtaposition. Let At this time, the connection determination unit 95 may output an alarm notifying that there is a possibility that some abnormality has occurred in the battery bank 4 to be inserted.

If the voltage value of the battery bank 4 is less than the determination voltage V _H (step S102: YES), the connection determination unit 95, the voltage value of the voltmeter 7 corresponding to the parallel input target battery banks 4 than the determination voltage V _L It is determined whether it is larger (step S103). When the voltage value of the battery bank 4 is greater than the determination voltage _VL (step S103: YES), the connection determination unit 95 determines the voltage value of the parallel insertion target battery bank 4 and the voltage of the other battery bank 4 in parallel. It is determined that the difference from the value is within the allowable range, and the process proceeds to step S112.

When the voltage value of the battery bank 4 is equal to or lower than the determination voltage _VL (step S103: NO), the connection determination unit 95 continues to open the main circuit switch 5 corresponding to the battery bank 4 to be inserted (step S103). S104). The connection determination unit 95 outputs input information for inputting the charging switch 6 corresponding to the parallel insertion target battery bank 4 to the charging switching control unit 93 to input the charging switch 6. (Step S105). The connection determination unit 95 causes the charging converter circuit 3 to start supplying direct current obtained by converting alternating current (step S106), and starts charging corresponding to the battery bank 4 to be inserted.

The connection determination unit 95 waits for a predetermined time (step S107), and determines whether or not the voltage value of the voltmeter 7 corresponding to the battery bank 4 to be inserted is larger than the determination voltage _VL (step S107). S108). When the voltage value of the battery bank 4 to be inserted is equal to or lower than the determination voltage _VL (step S108: NO), the connection determination unit 95 returns the process to step S107 and waits for a certain time again.

When the voltage value of the battery bank 4 to be inserted is less than the determination voltage _VL (step S108: YES), the connection determination unit 95 determines the voltage value of the voltmeter 7 corresponding to the battery bank 4 to be inserted. It is determined whether or not the voltage is less than _VH (step S109). When the voltage value of the battery bank 4 to be juxtaposed is less than the determination voltage V _H (step S109: YES), the connection determination unit 95 is connected to the voltage value of the battery bank 4 to be juxtaposed, It is determined that the difference from the voltage value of battery bank 4 is within the allowable range, and the process proceeds to step S110.

  The connection determination unit 95 stops the supply of direct current to the charging converter circuit 3 (step S110), opens the charging switch 6 corresponding to the battery bank 4 to be juxtaposed (step S111), and Charging the battery bank 4 is stopped. The connection determination unit 95 outputs to the main circuit switching control unit 92 insertion information that inputs the main circuit switch 5 corresponding to the battery bank 4 to be juxtaposed, and sets the battery bank 4 to be juxtaposed. (Step S112), and the storage battery control process is terminated.

In the judgment in the step S109, if the voltage value of the parallel input target battery bank 4 is determination voltage V _H or (step S109: NO), the connection determination unit 95, abnormality occurs in the like charge converter circuit 3 parallel It is determined that there is a possibility that the battery bank 4 to be entered has been overcharged, and the process proceeds to step S113. The connection determination unit 95 causes the charging converter circuit 3 to stop supplying direct current (step S113), and opens the charging switch 6 corresponding to the battery bank 4 to be inserted (step S114). The connection determination part 95 stops the charge with respect to the battery bank 4 of parallel insertion object, and complete | finishes a storage battery control process, without performing parallel insertion. At this time, the connection determination unit 95 may output an alarm notifying that there is a possibility that the battery bank 4 to be juxtaposed has been overcharged.

  According to the power supply system 100 in the first embodiment, when the storage battery control device 9 enters the battery bank 4 in parallel, the determination voltage based on the voltage value of the battery bank 4 already connected to the power converter 2 is set. Based on the range, it is determined whether or not the battery bank 4 is juxtaposed. If the voltage value of the battery bank 4 to be juxtaposed is lower than the standard, the battery bank 4 is juxtaposed after being charged. Thereby, in the power supply system 100, it is not necessary to manually perform voltage measurement and charging operations required when the battery banks 4 are juxtaposed, and the operation and time for juxtaposition can be reduced.

  When the storage battery control device 9 detects a failure or abnormality of the battery bank 4, the storage battery control device 9 opens the main circuit switch 5 and the charging switch 6, and the battery bank 4, the power converter 2, and the charging converter circuit 3 Disconnect the circuit. As a result, when an abnormality is detected in any one of the plurality of battery banks 4-1 to 4-n, the battery bank 4 is disconnected to prevent other battery banks 4 from being affected. be able to.

  In addition, when the storage battery control device 9 determines that there is a possibility that overcharge has been performed while charging the battery bank 4 to be juxtaposed, the storage battery control device 9 performs parallel processing of the battery bank 4 to be juxtaposed. Cancel the entry. As a result, it is possible to prevent the battery bank 4 that may have a problem from being inserted in parallel and affecting other battery banks 4.

  Further, in the power supply system 100, since the charging converter circuit 3 for charging the battery bank 4 to be inserted and the power converter 2 are provided in parallel, the operation of the power converter 2 is stopped by inspection or repair. The battery bank 4 can be juxtaposed even during the operation.

(Second Embodiment)
FIG. 4 is a block diagram illustrating a configuration example of the power supply system 200 according to the second embodiment. A power supply system 200 according to the second embodiment is a modification of the power supply system 100 according to the first embodiment. In the power supply system 200, direct current when charging the battery bank 4 to be juxtaposed is obtained by converting direct current output from the converter circuit 21 of the power converter 2. The power supply system 200 includes a charging chopper circuit 10 instead of the charging converter circuit 3 in the first embodiment.

  The charging chopper circuit 10 converts a DC voltage output from the converter circuit 21 into a charging voltage when charging the battery bank 4 to be juxtaposed, and supplies the charging voltage to the charging switches 6-1 to 6-n. . The charging chopper circuit 10 supplies a direct current of the charging voltage in accordance with the control of the storage battery control device 9. The control of the storage battery control device 9 for the charging chopper circuit 10 is the same as the control of the storage battery control device 9 for the charging converter circuit 3. Also in the power supply system 200, the storage battery control device 9 performs the storage battery control process shown in FIG. The storage battery control device 9 controls the charging chopper circuit 10 in step S106, step S110, and step S113.

  Also in the power supply system 200, the storage battery control device 9 performs the storage battery control process, so that the work and time required when the battery banks 4 are inserted in parallel can be reduced. Further, the power supply system 200 can supply the direct current of the battery banks 4 arranged in parallel to the charging chopper circuit 10 via the chopper circuit 23 even when the alternating current is not supplied from the alternating current power supply 1. Thereby, even when alternating current is not supplied from the alternating current power supply 1, the power supply system 200 can place the battery bank 4 in parallel after charging the battery bank 4 to be juxtaposed.

Incidentally, in the power supply system 200, when the voltage of the parallel input target battery bank 4 is determination voltage V _H abnormality, connection determination unit 95 of the storage battery control apparatus 9 controls the charging chopper circuit 10, the parallel input Direct current may be supplied from the target battery bank 4 to the chopper circuit 23 or the inverter circuit 22. Thereby, it is possible to discharge the battery bank 4 to be juxtaposed and place the voltage of the battery bank 4 in the range of the determination voltages V _L and V _H and make them juxtaposed.

(Third embodiment)
FIG. 5 is a block diagram illustrating a configuration example of the power supply system 300 according to the third embodiment. A power supply system 300 according to the third embodiment is a modification of the power supply system 200 according to the second embodiment. In the power supply system 200, the charging chopper circuit 10 is provided between the electric circuit connecting the converter circuit 21 and the chopper circuit 23 and the charging switches 6-1 to 6-n. And charging switches 6-1 to 6-n.

  The charging chopper circuit 10 in the power supply system 300 converts the DC voltage output from the chopper circuit 23 into a charging voltage when charging the battery bank 4 to be inserted, and charging switches 6-1 to 6-6. n. The control of the storage battery control device 9 for the charging chopper circuit 10 is the same as the control of the storage battery control device 9 for the charging converter circuit 3. Also in the power supply system 300, the storage battery control device 9 performs the storage battery control process shown in FIG. The storage battery control device 9 controls the charging chopper circuit 10 in step S106, step S110, and step S113.

  Also in the power supply system 300, the storage battery control device 9 performs the storage battery control process, so that the work and time required when the battery banks 4 are inserted in parallel can be reduced. Further, even when AC is not supplied from the AC power supply 1, the power supply system 300 charges the battery bank 4 to be juxtaposed by the charging chopper circuit 10 with the direct current of the battery banks 4 that are arranged in parallel. The voltages of the battery banks 4 can be arranged in parallel. In the power supply system 200, the converter circuit 21 supplies current to the chopper circuit 23 and the charging chopper circuit 10. On the other hand, in power supply system 300, charging chopper circuit 10 is supplied with current from chopper circuit 23, so that converter circuit 21 can be made smaller than converter circuit 21 in power supply system 200.

  In the power supply system of each of the embodiments described above, more battery banks 4 than the number of battery banks 4 having a capacity capable of supplying alternating current to the load over a predetermined time even when alternating current is not supplied from the alternating current power supply 1. The battery bank 4 may be made redundant. In this case, when the storage battery control device 9 detects an abnormality in one of the parallel battery banks 4 and disconnects the battery bank 4, any one of the redundant battery banks 4 is provided. Storage battery control processing may be performed in order to enter in parallel. As a result, even if an abnormality occurs in any of the battery banks 4, the operation of the power supply system can be continued and the stability can be improved. In addition, since the storage battery control device 9 autonomously disconnects and enters the battery bank 4, work by personnel who perform maintenance or inspection is not required, so that operation costs can be suppressed.

  Moreover, in the power supply system of each said embodiment, the power converter 2 demonstrated the structure which supplies alternating current with respect to load. However, the power converter 2 may supply direct current to the load. In this case, the power converter 2 includes a chopper circuit instead of the inverter circuit 22. The power converter 2 supplies the alternating current to the load as it is when the alternating current is supplied from the alternating current power supply 1, and changes the direct current supplied from the battery bank 4 to the alternating current when the alternating current is not supplied from the alternating current power supply 1. You may make it convert and supply to load.

  Moreover, you may make it implement | achieve the storage battery control apparatus 9 in each said embodiment by using a computer apparatus as basic hardware. In this case, each of the abnormality determination unit 91, the main circuit switching control unit 92, the charging switching control unit 93, the determination voltage calculation unit 94, and the connection determination unit 95 included in the storage battery control device 9 is programmed into a processor mounted on the computer device. This can be realized by executing. At this time, the storage battery control device 9 may be realized by installing the above program in a computer device in advance, or may be stored in a storage medium such as a CD-ROM or distributed through the network. Then, this program may be realized by appropriately installing it in a computer device.

  According to at least one embodiment described above, when the battery bank 4 is juxtaposed, the battery bank 4 is juxtaposed based on the voltage value of the battery bank 4 already connected to the power converter 2. If the voltage value of the battery bank 4 to be juxtaposed is lower than the reference, the battery bank 4 has a feature of being juxtaposed after being charged. The operation and time required for connecting the bank 4 can be reduced.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... AC power source, 2 ... Power converter, 3 ... Converter circuit for charge, 4,4-1,4-2,4-n ... Battery bank, 5,5-1,5-2,5-n ... Main Circuit switch, 6,6-1,6-2,6-n ... Charge switch, 7,7-1,7-2,7-n, 8 ... Voltmeter, 9 ... Storage battery controller, 10 ... Charging chopper circuit, 21 ... converter circuit, 22 ... inverter circuit, 23 ... chopper circuit, 24 ... control unit, 41 ... storage battery, 91 ... abnormality determination unit, 92 ... main circuit switching control unit, 93 ... charging switching control unit 94, determination voltage calculation unit, 95 ... connection determination unit, 100, 200, 300 ... power supply system

Claims (8)

A plurality of storage battery banks including one storage battery or a plurality of storage batteries connected in series;
A power converter that supplies current to a load using alternating current supplied from an alternating current power source and direct current supplied from the storage battery bank;
A charger for supplying direct current to the storage battery bank;
A first switch that is provided for each of the storage battery banks and opens and closes a connection between the corresponding storage battery bank and the power converter;
A second switch provided for each of the storage battery banks, which opens and closes a connection between the corresponding storage battery bank and the charger;
A storage battery control device in a power supply system comprising: a plurality of first switches; and a storage battery control device that controls the plurality of second switches;
When receiving an instruction to connect a storage battery bank that is not connected to the power converter among the plurality of storage battery banks to the power converter, a connection is made based on the voltage of the storage battery bank that is already connected to the power converter. A determination voltage calculation unit that calculates a voltage range for determining whether or not
When the voltage of the storage battery bank specified by the instruction is included in the voltage range, the first switch corresponding to the storage battery bank is closed and connected to the power converter, and the voltage of the storage battery bank is When the voltage is lower than the voltage range, the second switch corresponding to the storage battery bank is closed and connected to the charger to open the second switch when the voltage of the storage battery bank is included in the voltage range. A connection determination unit for closing the first switch and connecting to the power converter after
A storage battery control device. In the storage battery control device according to claim 1,
The connection determination unit
It is determined that an abnormality has occurred when the voltage of the storage battery bank specified by the instruction is higher than the voltage range;
Storage battery control device. In the storage battery control device according to claim 1 or 2,
When the voltage of the storage battery bank exceeds the voltage range after the second switch corresponding to the storage battery bank specified by the instruction is closed and connected to the charger, the second switch is opened. Determining that the storage battery bank is not connected to the power converter;
Storage battery control device. In the storage battery control device according to claim 3,
The connection determination unit
When the voltage of the storage battery bank exceeds the voltage range after the second switch corresponding to the storage battery bank specified by the instruction is closed and connected to the charger, it is determined that an abnormality has occurred.
Storage battery control device. In the storage battery control device according to any one of claims 1 to 4,
It further includes an abnormality determination unit that determines whether or not there is an abnormality in the plurality of storage battery banks, and opens the first switch corresponding to the storage battery bank that is determined to have an abnormality.
The connection determination unit
When the abnormality determination unit determines that an abnormality has occurred in any of the plurality of storage battery banks, the voltage of the storage battery bank that is not connected to the power converter among the plurality of storage battery banks is the voltage. The first switch corresponding to the storage battery bank is closed when it is included in the range and connected to the power converter, and the voltage corresponding to the storage battery bank is lower when the voltage of the storage battery bank is lower than the voltage range. When the voltage of the storage battery bank is included in the voltage range by closing the switch of 2 and connecting to the charger, the second switch is opened and then the first switch is closed to convert the power Connect to the instrument,
Storage battery control device. A plurality of storage battery banks including one storage battery or a plurality of storage batteries connected in series;
A power converter that supplies current to a load using alternating current supplied from an alternating current power source and direct current supplied from the storage battery bank;
A charger for supplying direct current to the storage battery bank;
A first switch that is provided for each of the storage battery banks and opens and closes a connection between the corresponding storage battery bank and the power converter;
A second switch provided for each of the storage battery banks, which opens and closes a connection between the corresponding storage battery bank and the charger;
A storage battery control method in a power supply system, comprising: a storage battery control device that controls a plurality of the first switches and a plurality of the second switches,
When receiving an instruction to connect a storage battery bank that is not connected to the power converter among the plurality of storage battery banks to the power converter, a connection is made based on the voltage of the storage battery bank that is already connected to the power converter. A first step of calculating a voltage range for determining whether or not
A second step of closing the first switch corresponding to the storage battery bank and connecting to the power converter when the voltage of the storage battery bank specified by the instruction is included in the voltage range;
When the voltage of the storage battery bank specified by the instruction is lower than the voltage range, the second switch corresponding to the storage battery bank is closed and connected to the charger to start charging the storage battery bank A third step,
When the voltage of the storage battery bank is included in the voltage range by charging the storage battery bank specified by the instruction, the second switch is opened and then the first switch is closed to the power converter. A fourth step of connecting;
A storage battery control method. A plurality of storage battery banks including one storage battery or a plurality of storage batteries connected in series;
A power converter that supplies current to a load using alternating current supplied from an alternating current power source and direct current supplied from the storage battery bank;
A charger for supplying direct current to the storage battery bank;
A first switch that is provided for each of the storage battery banks and opens and closes a connection between the corresponding storage battery bank and the power converter;
A second switch provided for each of the storage battery banks, which opens and closes a connection between the corresponding storage battery bank and the charger;
A storage battery control device in a power supply system comprising: a plurality of first switches; and a storage battery control device that controls the plurality of second switches;
When receiving an instruction to connect a storage battery bank that is not connected to the power converter among the plurality of storage battery banks to the power converter, a connection is made based on the voltage of the storage battery bank that is already connected to the power converter. A determination voltage calculation unit that calculates a voltage range for determining whether or not
When the voltage of the storage battery bank specified by the instruction is included in the voltage range, the first switch corresponding to the storage battery bank is closed and connected to the power converter, and the voltage of the storage battery bank is When the voltage is lower than the voltage range, the second switch corresponding to the storage battery bank is closed and connected to the charger to open the second switch when the voltage of the storage battery bank is included in the voltage range. A connection determination unit for closing the first switch and connecting to the power converter after
A storage battery control program for causing a computer to function as a storage battery control device. A plurality of storage battery banks including one storage battery or a plurality of storage batteries connected in series;
A power converter that supplies current to a load using alternating current supplied from an alternating current power source and direct current supplied from the storage battery bank;
A charger for supplying direct current to the storage battery bank;
A first switch that is provided for each of the storage battery banks and opens and closes a connection between the corresponding storage battery bank and the power converter;
A second switch provided for each of the storage battery banks, which opens and closes a connection between the corresponding storage battery bank and the charger;
A storage battery control device for controlling the plurality of first switches and the plurality of second switches;
With
The storage battery control device
When receiving an instruction to connect a storage battery bank that is not connected to the power converter of the storage battery bank to the power converter, whether or not to connect based on the voltage of the storage battery bank that is already connected to the power converter A determination voltage calculation unit for calculating a voltage range for determining
When the voltage of the storage battery bank specified by the instruction is included in the voltage range, the first switch corresponding to the storage battery bank is closed and connected to the power converter, and the voltage of the storage battery bank is When the voltage is lower than the voltage range, the second switch corresponding to the storage battery bank is closed and connected to the charger to open the second switch when the voltage of the storage battery bank is included in the voltage range. A connection determination unit for closing the first switch and connecting to the power converter after
Comprising
Power system.

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