Maintenance inspection device

Abstract

To provide a maintenance inspection device capable of reliably performing maintenance inspections within a predetermined period.SOLUTION: The maintenance inspection device includes a processor. The processor, based on a discharge record list in which elapsed time from previous discharge of each of a plurality of chargers-dischargers is recorded and a charger-discharger status list in which usable status of each of the plurality of chargers-dischargers is recorded, selects a charger-discharger to be subjected to maintenance inspection from among the plurality of chargers-dischargers, and after the charger-discharger to be subjected to maintenance inspection performs charge / discharge, updates the discharge record list with the result obtained by performing test charge / discharge by the charger-discharger to be subjected to maintenance inspection.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a maintenance and inspection device. [Background technology]

[0002] Patent Document 1 discloses a technology for controlling maintenance and inspection plans for multiple battery units connected to a power grid. This technology estimates the amount of power generated by a power generation facility connected to the power grid, and generates a maintenance schedule for the multiple battery units based on this estimated amount of power. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-71463 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in Patent Document 1, a maintenance or inspection schedule is generated based on the estimated power generation amount of the power generation equipment, so if the power generation amount remains low for a long period of time, opportunities for maintenance or inspection may be limited, and it may not be possible to reliably carry out the maintenance or inspection within the specified period.

[0005] The present disclosure has been made in view of the above, and aims to provide a maintenance and inspection device that can reliably perform maintenance and inspection at a set period of time. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the objectives, the maintenance and inspection device of the present disclosure is a maintenance and inspection device that performs maintenance and inspection in a VPP and is equipped with a processor, and the processor selects a charger / discharger to be inspected for maintenance and inspection from among a plurality of chargers and dischargers based on a discharge history list that records the time elapsed since the last discharge of each of a plurality of chargers and dischargers, and a charger / discharger status list that records the available status of each of the plurality of chargers and dischargers, and after charging and discharging are performed by the charger / discharger to be inspected for maintenance and inspection, updates the discharge history list with the results of test charging and discharging performed by the charger / discharger to be inspected for maintenance and inspection. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to reliably carry out maintenance inspections at set intervals. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic configuration diagram of a virtual power plant to which a maintenance and inspection system according to an embodiment of the present invention is applied. [Figure 2] FIG. 2 is a block diagram showing the functional configuration of the maintenance and inspection device. [Figure 3] FIG. 3 is a diagram showing an example of a discharge performance list recorded by a discharge execution list recording unit provided in the maintenance and inspection device. [Figure 4] FIG. 4 is a diagram showing an example of a maintenance and inspection list recorded by a maintenance and inspection list recording unit included in the maintenance and inspection device. [Figure 5] FIG. 5 is a diagram showing an example of a charger / discharger status list recorded by a discharger status list recording unit provided in the charging, maintenance, and inspection device. [Figure 6] FIG. 6 is a flowchart illustrating an outline of the process executed by the maintenance and inspection device according to one embodiment. [Figure 7] FIG. 7 is a diagram showing an example of the updated charge / discharge record list. [Figure 8] FIG. 8 is a diagram showing an example of a maintenance inspection list after a test is performed. [Figure 9]FIG. 9 is a diagram showing an example of a maintenance inspection list after a test is performed. [Figure 10] FIG. 10 is a flowchart illustrating an outline of a process executed by a maintenance and inspection device according to a modified example of an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] A maintenance and inspection system including a maintenance and inspection device according to an embodiment of the present disclosure will be described below with reference to the drawings. Note that the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially identical. Furthermore, the figures referenced in the following description merely show a schematic representation of the shape, size, and positional relationship to the extent that the contents of the present disclosure can be understood. In other words, the present disclosure is not limited to the shape, size, and positional relationship exemplified in each figure.

[0010] [Configuration of maintenance and inspection system] Fig. 1 is a schematic configuration diagram of a virtual power plant (VPP) to which a maintenance and inspection system according to one embodiment is applied. The maintenance and inspection system 100 shown in Fig. 1 includes a first power receiving group 1 connected to a power receiving end A connected via a transmission line to a power grid that transmits power generated at a power plant or the like, a second power receiving group 2 including a power receiving end B1 connected to the power receiving end A via a transmission line, and a third power receiving group 3 including a power receiving end B2 connected to the power receiving end A via a transmission line.

[0011] The receiving end A converts the voltage of the power supplied from the power grid into a predetermined voltage and then supplies the power to the receiving end B1 and the receiving end B2 via a transmission line. The receiving end A is assumed to be, for example, a high-voltage substation.

[0012] The first power receiving group 1 performs maintenance and inspection of the second power receiving group 2 and the third power receiving group 3 via the power receiving terminal A. The first power receiving group 1 includes a maintenance and inspection device 10 and a power meter 20.

[0013] The maintenance and inspection device 10 selects a discharge device to be inspected according to the maintenance and inspection list of the charger / discharger to be inspected, and updates the discharge record list by entering the results of inspecting the selected charger / discharger. The detailed configuration of the maintenance and inspection device 10 will be described later.

[0014] The power meter 20 measures the charge and discharge at the power receiving end A and outputs the measurement result to the maintenance and inspection device 10. In one embodiment, the maintenance and inspection device 10 controls the discharge power at the power receiving end B1 and the received power at the power receiving end B2 so that the charge and discharge at the power receiving end A becomes zero.

[0015] The second power receiving group 2 includes a power receiving end B1, a plurality of chargers / dischargers 30, a stationary storage battery 31, a wattmeter 40, and a control device 50.

[0016] The power receiving end B1 converts the power supplied from the power receiving end A into a predetermined voltage, and supplies the converted power to the plurality of chargers / dischargers 30 and the stationary storage batteries 31. The power receiving end B1 is configured using a transformer or the like.

[0017] Each of the plurality of chargers / dischargers 30 is a charging station or the like, to which an electric vehicle 200 is connected, and charges the battery of the electric vehicle 200 using power supplied from a power receiving end B1. Each of the plurality of chargers / dischargers 30 also discharges power supplied from the battery of the connected electric vehicle 200 to the power receiving end B1. Note that the electric vehicle 200 is assumed to be an EV (Electric Vehicle) having a battery, but may also be an HV (Hybrid Vehicle), FCEV (Fuel Cell Electric Vehicle), or the like.

[0018] The stationary storage battery 31 is configured using, for example, a lithium ion battery, and stores the power supplied from the power receiving end B1, and under the control of the control device 50, discharges the stored power to the power receiving end B1.

[0019] The wattmeter 40 measures the charge and discharge at the power receiving end B1 and outputs the measurement result to the control device 50.

[0020] The control device 50 controls the charging and discharging of the second power receiving group 2 under the control of the maintenance and inspection device 10. The control device 50 is realized using a processor having a memory and hardware. The hardware is, for example, a memory, a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and an FPGA (Field-Programmable Gate Array).

[0021] The third power receiving group 3 includes a power receiving terminal B2, a plurality of chargers / dischargers 30, a power meter 60, and a control device .

[0022] The power receiving end B2 converts the power supplied from the power receiving end A into a predetermined voltage, and supplies the converted power to the plurality of chargers / dischargers 30. The power receiving end B2 is configured using a transformer or the like.

[0023] The wattmeter 60 measures the charge and discharge at the power receiving end B2 and outputs the measurement result to the control device .

[0024] The control device 70 controls the charging and discharging of the third power receiving group 3 under the control of the maintenance and inspection device 10. The control device 70 is realized using a processor having a memory and hardware. The hardware is, for example, a memory, a CPU, a DSP, an FPGA, etc.

[0025] A virtual power plant to which the maintenance and inspection system 100 configured as described above is applied is a system that can adjust the balance of supply and demand of power in a power distribution network by controlling the charging and discharging operation of the battery mounted on the electric vehicle 200. Such a virtual power plant can reduce the amount of fossil fuel used at the power plant by effectively utilizing the power of the battery mounted on the electric vehicle 200, thereby reducing the amount of CO2 generated and social costs such as fuel costs, equipment costs, and carbon taxes. Furthermore, the maintenance and inspection system 100 is controlled so that the discharged power at the power receiving end B1 is equal to the received power at the power receiving end B2, and so that the charging and discharging at the power receiving end A is zero.

[0026] [Functional configuration of maintenance and inspection device] Next, a description will be given of the functional configuration of the maintenance and inspection device 10. FIG.

[0027] The maintenance and inspection device 10 shown in FIG. 2 includes a communication unit 11, an input unit 12, a display unit 13, a recording unit 14, and a control unit 15.

[0028] Under the control of the control unit 15, the communication unit 11 transmits various types of information to each of the control devices 50 of the second power receiving group 2 and the control devices 70 of the third power receiving group 3 via a network (not shown), and receives various types of information, such as the amount of charging and discharging, from each of the control devices 50 of the second power receiving group 2 and the control devices 70 of the third power receiving group 3. The communication unit 11 also outputs the charging and discharging power measured at the power receiving end A input from the wattmeter 20 to the control unit 15. The communication unit 11 is configured using a communication module.

[0029] The input unit 12 receives various inputs in response to external operations and outputs them to the control unit 15. The input unit 12 is configured using buttons, a keyboard, switches, a touch panel, and the like.

[0030] The display unit 13 displays various information related to the maintenance and inspection device 10 under the control of the control unit 15. The display unit 13 is configured using a liquid crystal display, an organic EL display (Organic Electroluminescent Display), or the like.

[0031] The recording unit 14 is configured using a hard disk drive (HDD), a solid state drive (SSD), etc. The recording unit 14 has a program recording unit 141, a discharge execution list recording unit 142, a maintenance and inspection list recording unit 143, and a charger / discharger status list recording unit 144.

[0032] The program recording unit 141 records various programs executed by the maintenance and inspection device 10 and various data that is being executed by the maintenance and inspection device 10 .

[0033] The discharge execution list recording unit 142 records a discharge history list in which the time elapsed since the previous discharge is associated with each charger / discharger ID that identifies the charger / discharger. FIG. 3 is a diagram showing an example of a discharge history list recorded by the discharge execution list recording unit 142. In the discharge history list T1 shown in FIG. 3, the time elapsed since the previous discharge is associated with each charger / discharger ID. For example, in the discharge history list T1, the charger / discharger ID "ID00232" is recorded in association with the time elapsed since the previous discharge, "362:15:29". Furthermore, the discharge history list T1 is recorded in order of the time elapsed since the previous discharge.

[0034] The maintenance and inspection list recording unit 143 records a maintenance and inspection list in which a discharge inspection implementation date is associated with each charger / discharger ID that identifies the charger / discharger. Fig. 4 is a diagram showing an example of a maintenance and inspection list recorded by the maintenance and inspection list recording unit 143. In the maintenance and inspection list T2 shown in Fig. 4, a discharge inspection implementation date is associated with each charger / discharger ID and recorded. Note that the maintenance and inspection list T2 in Fig. 4 shows a state in which no maintenance and inspection has been set for the charger / discharger.

[0035] The charger / discharger status list recording unit 144 records a charger / discharger status list in which an available status is associated with each charger / discharger ID that identifies a charger / discharger. Fig. 5 is a diagram showing an example of a charger / discharger status list recorded by the charger / discharger status list recording unit 144. In the charger / discharger status list T3 shown in Fig. 5, a charger / discharger status is recorded in association with each charger / discharger ID. For example, in the charger / discharger status list T3, a charger / discharger ID "ID00232" is recorded in association with a charger / discharger status "available".

[0036] The control unit 15 corresponds to a processor according to the present disclosure. The control unit 15 is realized using a processor having hardware such as an FPGA, a GPU, or a CPU, and a memory that is a temporary storage area used by the processor. The control unit 15 includes a selection unit 151, a creation unit 152, an update unit 153, and a determination unit 154. In one embodiment, the control unit 15 functions as the processor.

[0037] The selection unit 151 refers to the discharge record list T1 stored in the discharge implementation list recording unit 142 and the charger / discharger status list T3 recorded in the charger / discharger status list recording unit 144, and selects the charger / discharger 30 for which the longest time has elapsed since the previous discharge was performed.

[0038] The creation unit 152 creates a test discharge plan for the charger / discharger 30 that is the target of test discharge.

[0039] The update unit 153 updates the discharge history list T1 by setting the time elapsed since the previous discharge for the charger / discharger 30 that is the subject of the inspection discharge to zero and moving it to the end of the discharge history list T1. Furthermore, if the charger / discharger 30 that is the subject of the inspection discharge has an abnormality such as a breakdown, the update unit 153 adds it to the maintenance inspection list T2 and updates the charger / discharger status list T3 by changing its status to unavailable.

[0040] The determination unit 154 determines whether or not a predetermined time, which is the maintenance deadline, has passed for the charger / discharger selected by the selection unit 151.

[0041] [Processing performed by the maintenance and inspection device] Next, a description will be given of the processing executed by the maintenance and inspection device 10. FIG.

[0042] 6, the selection unit 151 refers to the discharge record list T1 stored in the discharge execution list recording unit 142 and the charger / discharger status list T3 recorded in the charger / discharger status list recording unit 144, and selects the charger / discharger 30 for which the longest time has elapsed since the previous discharge in order to check whether there is any charger / discharger 30 that needs to be subjected to test discharge for maintenance purposes (step S101). Specifically, the selection unit 151 investigates the test candidate charger / dischargers 30 in descending order of the time elapsed since the previous discharge, based on the discharge record list T1 (see FIG. 3) stored in the discharge execution list recording unit 142 and the charger / discharger status list T3 (see FIG. 5) recorded in the charger / discharger status list recording unit 144, and selects the charger / discharger 30 as the test target if a predetermined period of time has elapsed (for example, 300 hours or more) and the charge / discharge status is available. In this case, as shown in the discharge record list T1 and the charger / discharger status list T3, the time elapsed since the last discharge of the charger / discharger 30 with the charger / discharger ID "ID00232" has exceeded a predetermined time, and the availability status is "available," so the selection unit 151 selects the charger / discharger 30 with the charger / discharger ID "ID00232" as the charger / discharger 30 that needs to undergo test discharge for maintenance purposes. Note that, based on the charger / discharger status list T3, the selection unit 151 excludes the charger / discharger 30 with the charger / discharger ID whose availability status is "unavailable" from the selection targets for testing (inspection).

[0043] The determination unit 154 determines whether a predetermined time, which is a maintenance deadline, has elapsed for the charger / discharger 30 selected by the selection unit 151 (step S102). In this case, the determination unit 154 determines whether a predetermined time, for example, 300 hours, has elapsed since the previous discharge of the charger / discharger 30 selected by the selection unit 151. If the determination unit 154 determines that the predetermined time has elapsed for the charger / discharger 30 selected by the selection unit 151 (step S102: Yes), the maintenance / inspection device 10 proceeds to step S103, which will be described later. If the determination unit 154 determines that the predetermined time has not elapsed for the charger / discharger 30 selected by the selection unit 151 (step S102: No), the maintenance / inspection device 10 proceeds to step S109, which will be described later.

[0044] In step S103, the creation unit 152 creates an inspection discharge plan for the charger / discharger 30 that is the target of test discharge. In this case, the creation unit 152 selects an electric vehicle 200 to be charged with the power discharged for the test. The electric vehicle 200 to be charged with the power discharged for the test is, for example, an electric vehicle 200 that is connected to the charger / discharger 30. Note that the electric vehicle 200 may automatically move to the second power receiving group 2 or the third group and connect to the charger / discharger 30 in accordance with an instruction signal from the maintenance / inspection device 10.

[0045] Next, the update unit 153 performs test charging and discharging in accordance with the test discharging plan created by the creation unit 152 (step S104). In this case, the update unit 153 controls each of the control devices 50 of the second power receiving group 2 and the control devices 70 of the third group to charge and discharge the charger / discharge devices 30 to be inspected in each of the second power receiving group 2 and the third group. At this time, the update unit 153 performs charging and discharging with a setting such that the discharge amount at the power receiving end B1 and the charge amount at the power receiving end B2 are equal so that there is no power fluctuation at the power receiving end A, taking into consideration not to affect the power grid during the test discharging.

[0046] Thereafter, the update unit 153 determines whether charging and discharging have been performed normally based on the measurement results acquired via the power meter 20 (step S105). Specifically, based on the measurement results acquired via the power meter 20, it determines whether power fluctuations have occurred at the power receiving end A, and if no power fluctuations have occurred, it determines that charging and discharging have been performed normally, whereas if power fluctuations have occurred at the power receiving end A, it determines that charging and discharging have not been performed normally. If the update unit 153 determines that charging and discharging have been performed normally (step S105: Yes), the maintenance and inspection device 10 proceeds to step S106, which will be described later. On the other hand, if the update unit 153 determines that charging and discharging have not been performed normally (step S105: No), the maintenance and inspection device 10 proceeds to step S107, which will be described later.

[0047] In step S106, the update unit 153 updates the discharge history list T1 by setting the elapsed time since the previous discharge for the charger / discharger 30 that is the target of the inspection discharge to zero and moving it to the end of the discharge history list T1. FIG. 7 is a diagram showing an example of the discharge history list T1 after the update. As shown in FIG. 7, the update unit 153 moves the charger / discharger ID "ID00232" to the end of the discharge history list T1 and updates it by setting the elapsed time since the previous discharge to zero (0:00:00). After step S106, the maintenance / inspection device 10 proceeds to step S108, which will be described later.

[0048] In step S107, the update unit 153 determines that the charger / discharger 30 to be inspected for discharge has an abnormality, such as a fault, and adds it to the maintenance / inspection list T2. The update unit 153 also updates the charger / discharger status list T3 by changing its status to unavailable. Specifically, to exclude the charger / discharger 30 from the VPP target, the update unit 153 adds the charger / discharger ID "ID00232" that had the abnormality, such as a fault, and the discharge test implementation date "2023 / 12 / 04 15:00:00" to the maintenance / inspection list T2 in association with the charger / discharger ID. Furthermore, the update unit 153 updates the charger / discharger status list T3 by changing the availability status of the charger / discharger ID "ID00232" to "unavailable." As a result, the unavailable charger / discharger 30 is no longer eligible for VPP. After step S107, the maintenance / inspection device 10 proceeds to step S108, which will be described later.

[0049] In step S108, the selection unit 151 determines whether a predetermined time, which is the timing for the next inspection, has elapsed. If the selection unit 151 determines that the predetermined time has elapsed (step S108: Yes), the maintenance and inspection device 10 returns to step S101. On the other hand, if the selection unit 151 determines that the predetermined time has not elapsed (step S108: No), the maintenance and inspection device 10 waits until the predetermined time has elapsed (step S109), and returns to step S108.

[0050] According to the embodiment described above, the selection unit 151 refers to the discharge history list T1 and the charger / discharger status list T3 to check whether there is a charger / discharger 30 that needs to be subjected to test discharge for maintenance purposes, and selects the charger / discharger 30 for which the longest time has elapsed since the last discharge, thereby ensuring that maintenance inspections can be carried out within the specified period.

[0051] (Variation) Fig. 10 is a flowchart outlining the processing executed by the maintenance and inspection device 10 according to a modified example of the embodiment. In Fig. 10, steps S201 to S203 and steps S208 to S213 correspond to steps S101 to S103 and steps S104 to S109, respectively, in Fig. 6, but steps S204 to S207 are different. Steps S204 to S207 will be described below.

[0052] In step S204, the creation unit 152 communicates with the control device 50 of the second power receiving group 2 and the control device 70 of the third group, and searches for a chargeable electric vehicle 200. Specifically, the creation unit 152 searches for whether the electric vehicle 200 is being charged or discharged by either the charger / discharger 30 of the second power receiving group 2 or the charger / discharger 30 of the third power receiving group 3.

[0053] Next, the creation unit 152 determines whether the found electric vehicle 200 is capable of discharging (step S205), and if the found electric vehicle 200 is capable of discharging (step S205: Yes), it designates the found electric vehicle 200 as a charging target (step S206). After step S206, the maintenance and inspection device 10 proceeds to step S208. On the other hand, if the found electric vehicle 200 is not capable of discharging (step S205: No), the creation unit 152 selects a storage battery for inspection (step S207). Specifically, the creation unit 152 selects a stationary storage battery 31 for discharging in the test discharge plan. After step S207, the maintenance and inspection device 10 proceeds to step S208.

[0054] According to the modification of the embodiment described above, if the electric vehicle 200 found is not capable of discharging, the creation unit 152 selects a storage battery for inspection, thereby ensuring that maintenance and inspection are carried out within the specified period.

[0055] (Other embodiments) In the embodiment, the test discharge is the target, but the charging side can also be considered as the target of the test (inspection). When using electric vehicle 200, charging for driving is performed daily, while the frequency of discharging is low. In consideration of this, discharging is the target of maintenance and inspection, but if it is expected that there will be few opportunities to charge, charging can also be considered as the target of maintenance and inspection.

[0056] Furthermore, in one embodiment, in creating a test discharge plan, electric vehicle 200 and charger / discharger 30 are required to charge the discharged amount without affecting the grid, but the test discharge itself (inspection discharge itself) also requires electric vehicle 200 in a state where discharge is possible. Considering these conditions, it is assumed that there may be cases where it is difficult to create a test discharge plan. In such cases, the maintenance and inspection device 10 may determine that the state of charger / discharger 30 is uninspectable and may make it an object of inspection from the next time onwards. Of course, in addition to determining that the device is unusable, the maintenance and inspection device 10 may also perform processing such as counting the number of times that the device is unusable and adding the device to the maintenance and inspection list T2 when a certain value is exceeded.

[0057] In addition, in one embodiment, the maintenance and inspection device 10 typically performs diagnosis periodically, but the maintenance and inspection device 10 may also perform diagnosis in response to an event. For example, if a demand response (DR) is expected based on past performance, the maintenance and inspection device 10 may perform diagnosis in preparation for that.

[0058] In one embodiment, the maintenance and inspection device 10 typically performs a test discharge (inspection discharge) under a fixed period of time since the previous discharge, but this period may be varied depending on the model of the charger / discharger 30. For example, the maintenance and inspection device 10 may vary the inspection conditions and period individually, taking into consideration the model of the charger / discharger 30, failure history, conditions due to the installation location, and the like.

[0059] In addition, in one embodiment, the maintenance and inspection device 10 selects one charger / discharger 30 as a representative example each time, but it is not necessary to limit it to one device at a time, and depending on the conditions, for example, when multiple charger / dischargers 30 are installed at the same time, test discharge of multiple charger / dischargers 30 may be performed simultaneously. In this case, the maintenance and inspection device 10 may perform test discharge on any number of devices as long as it is possible to create a plan, although the process of formulating a test plan becomes complicated.

[0060] Further advantages and modifications will readily occur to those skilled in the art. The invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

[0061] Although some of the embodiments of the present application have been described in detail above with reference to the drawings, these are merely examples, and the present invention can be implemented in other forms that have undergone various modifications and improvements based on the knowledge of those skilled in the art, including the aspects described in the disclosure of the present invention. [Explanation of symbols]

[0062] 1. First receiving group 2. Second receiving group 3. Third receiving group 10 Maintenance and inspection equipment 11 Communications Department 12 Input section 13 Display section 14 Recording section 15 Control Unit 20 Power meter 30 Charger / discharger 31 Stationary storage battery 40,60 wattmeter 50,70 Control device 100 Maintenance and Inspection System 141 Program Recording Section 142 Discharge execution list recording section 143 Maintenance and inspection list recording section 144 Charger / Discharger Status List Recording Unit 151 Selection Section 152 Creation Department 153 Update Department 154 Judgment section 200 electric vehicles

Claims

1. A maintenance and inspection device for performing maintenance and inspection in a VPP, a processor; The processor: selecting a charger / discharger to be inspected for maintenance from among the plurality of chargers / dischargers based on a discharge history list that records the time elapsed since the previous discharge of each of the plurality of chargers / dischargers and a charger / discharger status list that records the availability status of each of the plurality of chargers / dischargers; After the charge / discharge is performed by the charger / discharger to be inspected for maintenance and inspection, the discharge record list is updated with the result of test charge / discharge performed by the charger / discharger to be inspected for maintenance and inspection. Maintenance and inspection equipment.

2. The maintenance and inspection device according to claim 1, The processor: determining whether the charger / discharger to be inspected for maintenance is normal; If the charger / discharger to be inspected is normal, the discharge record list is updated with the result of test charging / discharging of the charger / discharger to be inspected; If the charger / discharger to be inspected is normal, change the status of the charger / discharger status list to "unavailable," and record the charger / discharger to be inspected and the discharge test implementation date in the maintenance inspection list. Maintenance and inspection equipment.

3. The maintenance and inspection device according to claim 2, The processor: If an electric vehicle cannot be selected to charge the power discharged by the charger / discharger to be inspected for maintenance and inspection, the power is charged to a stationary storage battery located in the same system as the power receiving end to which the charger / discharger to be inspected for maintenance and inspection is connected. Maintenance and inspection equipment.

4. The maintenance and inspection device according to claim 3, The processor: Charging and discharging are performed so that the discharge amount and the charge amount are equal at the receiving end to which the charger / discharger of the maintenance inspection target is connected. Maintenance and inspection equipment.

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