Power System

Abstract

To provide a power supply system for preventing loss of operation records of an uninterruptible power supply system while suppressing cost required for memory.SOLUTION: A power supply system includes: a continuous commercial type uninterruptible power supply system, in which power is supplied from a power system to a load when the power system is normal, and the power supply from the power system to the load is cut off and the power is supplied from an energy storage unit to the load when the power system is abnormal; and an external storage device having a shock-resistant structure and a heat-resistance structure that is connected for data communication to a control device included in the uninterruptible power supply system and acquires and stores operation data that is data relating to the operation of the uninterruptible power system when an abnormality occurs in the power system or the uninterruptible power supply system.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power supply system of a continuous commercial power supply type. [Background technology]

[0002] As a conventional power supply system of a continuous commercial power supply type, as shown in Patent Document 1, there is known an uninterruptible power supply system that supplies power from a power system to a load when the power system is normal, and cuts off the power supply from the power system to the load when an abnormality occurs in the power system, and supplies power to the load from an energy storage unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-010212 Summary of the Invention [Problem to be solved by the invention]

[0004] In the power supply system described above, the uninterruptible power supply system performs compensatory operation in the event of an abnormality such as a power grid accident, and it is required to store a record of the operation of the uninterruptible power supply system in the event of an abnormality so that the performance of the compensatory operation in the event of an abnormality can be evaluated. Therefore, in conventional uninterruptible power supply systems of this type, the operation record in the event of an abnormality is often stored in a storage unit set in the memory of a control device provided in the system, and then transmitted to a server device via a communication network.

[0005] However, in this case, if a communication failure occurs in the communication network due to an abnormality in the power system, the operation records cannot be sent to the server device and remain stored in the memory of the system's control device. In this case, if the next compensatory operation by the uninterruptible power supply system is performed before the operation records have been completely wiped out to the server device, there is a risk that the unsent data stored in the control device will be overwritten and lost.

[0006] One way to reduce this risk is to increase the capacity of the storage unit in the control device of the uninterruptible power supply system. However, the memory of the control device in the uninterruptible power supply system must be high performance, and in order to perform highly accurate data analysis in the event of an abnormality, it is necessary to record a wide variety of data related to operation records at a high sampling rate for a long period of time, and there is a problem that meeting these requirements would result in extremely high costs.

[0007] Another risk is that if an accident such as a fire or earthquake occurs in an uninterruptible power supply system, the memory of the control device may be damaged, resulting in the loss of stored operating records.

[0008] The present invention has been made to solve the above problems, and its main object is to prevent the loss of operation records of an uninterruptible power supply system while suppressing the cost required for memory. [Means for solving the problem]

[0009] That is, the power supply system of the present invention is characterized by comprising: an uninterruptible power supply system of a constant commercial power supply type that supplies power from the power system to a load when the power system is normal, cuts off the power supply from the power system to the load when there is an abnormality in the power system, and supplies power to the load from an energy storage unit; and an external storage device with a shock-resistant and heat-resistant structure that is connected to a control device provided in the uninterruptible power supply system so as to be able to communicate data, and that acquires and stores operating data that is data related to the operation of the uninterruptible power supply system when there is an abnormality in the power system or the uninterruptible power supply system.

[0010] With this configuration, the operational data is stored in an external storage device connected to the control device of the uninterruptible power supply system so that data can be communicated with it. Since this external storage device does not need to use high-performance memory equivalent to that of the control device, it is possible to use inexpensive memory as the external storage device, thereby keeping costs down and achieving a sufficiently large storage capacity. As a result, even if a communication network failure occurs due to a power system abnormality, for example, the operational records of the uninterruptible power supply system during that time can be preserved without loss. Furthermore, since the external storage device has a shock-resistant and heat-resistant structure, even if an accident such as a fire occurs, damage to the memory of the external storage device can be reduced and the loss of stored operational data can be prevented.

[0011] In order to reduce damage to the external storage device in the event of an accident such as a fire occurring within the uninterruptible power supply system and to more effectively prevent loss of operational data, it is preferable that the external storage device be installed outside the uninterruptible power supply system.

[0012] In the power supply system, it is preferable that the external storage device continues to acquire and store operational data from the uninterruptible power supply system even when the power grid or the uninterruptible power supply system is operating normally.

[0013] As a specific embodiment of the power supply system, it is preferable that the power supply system further comprises a server device for monitoring the status of the uninterruptible power supply system and remotely controlling it, and that the external storage device is configured to transmit the operating data obtained from the uninterruptible power supply system to the server device via a network.

[0014] Specific examples of the operational data include one or more types of data selected from the system voltage, system current, load voltage, load current, output voltage of the uninterruptible power supply system, output current, temperature, humidity, or the state of the energy storage unit.

[0015] In the event of an abnormality in the power grid or the uninterruptible power supply system, the external storage device is preferably configured to analyze the acquired operational data and automatically output the analysis results. In this way, the external storage device automatically analyzes the operational data and outputs the results, allowing the user to quickly check the operation of the uninterruptible power supply system in the event of an abnormality.

[0016] The external storage device preferably outputs the analysis results in a manner that enables the compensation operation performance of the uninterruptible power supply system to be confirmed. In this way, the user can easily check the compensation operation performance of the uninterruptible power supply system in the event of an abnormality.

[0017] Preferably, the external storage device has an internal power supply. In this way, even if the power supply from the external power source to the external storage device is cut off due to an accident or the like, it is possible to continue to acquire and store the operating data of the uninterruptible power supply system for a predetermined period of time. [Effects of the Invention]

[0018] According to the present invention configured in this manner, it is possible to prevent the loss of the operation record of the uninterruptible power supply system while suppressing the cost required for the memory. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a power supply system according to an embodiment of the present invention. [Figure 2] FIG. 4 is a diagram showing a report output from the external storage device of the embodiment. [Figure 3] FIG. 10 is a diagram showing the verification results of the compensation operation performance in the report of the embodiment. [Figure 4] FIG. 4 is a flowchart showing the operation of the external storage device according to the embodiment. [Figure 5] FIG. 10 is a schematic diagram showing the configuration of a power supply system according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a power supply system according to the present invention will be described below with reference to the drawings.

[0021] The power supply system 100 of this embodiment is provided between a power grid 10 and a load 30, and supplies power from the power grid 10 to the load 30 when the power grid 10 is operating normally, and cuts off the power supply from the power grid 10 to the load 30 when an abnormality occurs in the power grid 10, such as a power outage or momentary drop, and is equipped with an uninterruptible power supply system 1 of a continuous commercial power supply type that supplies power from an energy storage unit 4 to the load 30, and a server device 9 that monitors the status of the uninterruptible power supply system 1 and remotely controls it.

[0022] Specifically, this uninterruptible power supply system 1 includes a circuit breaker 2 that cuts off the power supply from the power grid 10 to the load 30, an operation data detection unit 3 that detects operation data, which is various data related to the operation of the uninterruptible power supply system, an energy storage unit 4, a power converter 6, for example of a voltage-controlled type, that is connected to the grid side of the circuit breaker 2 and converts the energy of the energy storage unit 4 into AC power, and a control device 7 that controls the circuit breaker 2 and the power converter 6.

[0023] The circuit breaker 2 is provided on the power line L1 for supplying power from the power system 10. This circuit breaker 2 can be a changeover switch capable of high-speed switching, such as a semiconductor switch or a hybrid switch that combines a semiconductor switch and a mechanical switch. For example, if a semiconductor switch is used, the interruption time can be reduced to 2 ms or less, allowing for interruption regardless of the zero point. Furthermore, if a hybrid switch is used, the interruption time can be reduced to 2 ms or less, allowing for interruption regardless of the zero point, and also reducing current loss to zero. The opening and closing of this circuit breaker 2 is controlled by a control device 7.

[0024] The operation data detection unit 3 constantly detects, using detection means such as sensors (not shown), the system voltage and system current of the power system 10, the load voltage and load current of the load 30, the output voltage and output current of the uninterruptible power supply system 1, temperature, humidity, and the state of the energy storage unit 4 (such as the remaining amount of fuel), as operation data, and transmits this to the control unit 7. For example, the operation data detection unit 3 detects the voltage on the system side of the circuit breaker 2 in the power line L1 via a potential transformer (not shown). The system voltage (hereinafter also referred to as the detected voltage) obtained by the operation data detection unit 3 is input to the control unit 7 and used to control the units 2 and 6.

[0025] The energy storage unit 4 is an energy storage device such as a storage battery such as a secondary battery, a flywheel, a fuel cell, an electric double layer capacitor, a pumped storage power generation system, a compressed air storage system, or a superconducting power storage system. The energy of the energy storage device is converted into AC power by a power converter 6 and supplied to a load. The power converter 6 is controlled by a control device 7.

[0026] The control device 7 is a dedicated or general-purpose computer equipped with a CPU, internal memory, an input / output interface, an A / D converter, etc., and detects voltage abnormalities in the power grid 10 using the voltage detected by the operation data detection unit 3 and controls the respective units 2 and 6, thereby controlling the compensation operation of the uninterruptible power supply system 1. Specifically, the control device 7 includes an abnormality detection unit 71 that detects voltage abnormalities in the power grid 10 using the voltage detected by the operation data detection unit 3, a circuit breaker control unit 72 that shuts off the circuit breaker 2 based on the detection result of the abnormality detection unit 71, a power converter control unit 73 that operates the power converter 6 when an abnormality occurs in the power grid 10, and an operation data external output unit 74 that outputs operation data acquired from the operation data detection unit 3 to an external storage device 8, which will be described later.

[0027] Here, the compensation operation of the uninterruptible power supply system 1 and the functions of the units 71 to 73 will be described.

[0028] (1) Power grid 10 in normal condition The operation data detector 3 constantly detects the system voltage and inputs the detected voltage to the abnormality detector 71. The abnormality detector 71 compares the detected voltage of the operation data detector 3 with a predetermined set value. Note that the set value in this embodiment is a voltage value for detecting a momentary sag.

[0029] When the power system 10 is normal, the detected voltage is equal to or greater than the set value, and the circuit breaker 2 is closed. As a result, AC power is supplied from the power system 10 to the load 30.

[0030] When power system 10 is operating normally, power converter control unit 73 does not activate power converter 6, and power converter 6 is in a stopped state.

[0031] (2) Abnormality in power grid 10 If there is an abnormality in the power grid 10, the detected voltage will be less than the set value. At this time, the abnormality detection unit 71 outputs an abnormality detection signal indicating that the system voltage is abnormal to the circuit breaker control unit 72. Upon receiving the abnormality detection signal, the circuit breaker control unit 72 outputs a tripping control signal to trip the circuit breaker 2, thereby tripping the circuit breaker 2. This causes the supply of AC power from the power grid 10 to the load 30 to be cut off.

[0032] The abnormality detection unit 71 outputs an abnormality detection signal to the power converter control unit 73. The power converter control unit 73, which has received the abnormality detection signal, outputs a start-up control signal to the power converter 6 based on the timing at which the abnormality detection signal was acquired, thereby starting up the power converter 6. This causes a current to flow to the load 30, and a compensation operation is performed.

[0033] Thereafter, when the power system 10 returns to normal, this is detected by the abnormality detection unit 71, and a normal return signal is output to the circuit breaker control unit 72 and the power converter control unit 73. As a result, the circuit breaker 2 is closed and the power converter 6 is stopped.

[0034] The power supply system 100 of this embodiment is externally provided with an external storage device 8 having a shock-resistant and heat-resistant structure, which is connected to the control device 7 provided in the uninterruptible power supply system 1 so as to be capable of data communication, and which acquires and stores operating data from the control device 7 in the event of an abnormality in the power grid 10 or the uninterruptible power supply system 1.

[0035] Specifically, the external storage device 8 has an exterior container with high impact resistance and heat resistance, similar to an aircraft black box, and houses a dedicated or general-purpose computer equipped with a CPU, internal memory, input / output interface, A / D converter, etc. As shown in Fig. 1, the external storage device 8 has a communication unit 81 that communicates data with the control device 7, an operation data storage unit 82 that stores operation data acquired from the control device 7, an analysis unit 83 that analyzes the operation data, and an internal power supply 84. The internal memory of the external storage device 8 has lower performance than the internal memory of the control device 7.

[0036] The communication unit 81 enables data communication with the control device 7 by wire or wirelessly, without going through the Internet. For example, FIFO or the like is adopted as a communication method between the communication unit 81 and the action data external output unit 74, and when the external output unit 74 acquires the action data sampled by the action data detection unit 3, it outputs the data to the communication unit 81 in the order in which it was acquired. Then, the communication unit 81 sequentially stores the action data acquired from the control device 7 in the action data storage unit 82.

[0037] The operation data storage unit 82 is set in a predetermined area of ​​the internal memory of the external storage device 8. The operation data storage unit 82 continues to store the operation data from the control device 7 acquired by the communication unit 81 in sequence.

[0038] The analysis unit 83 is configured to automatically analyze the operation data stored in the operation data storage unit 82 when an abnormality occurs in the power grid 10 or the uninterruptible power supply system 1, and automatically output the analysis results (specifically, a report). As shown in FIG. 2, the analysis results include at least the waveforms of the load voltage, the load current, the system voltage, the output voltage of the uninterruptible power supply system 1, and the verification results of the compensation operation performance of the uninterruptible power supply system 1. The verification results of the compensation operation performance are displayed in a manner that allows the compensation operation performance of the uninterruptible power supply system 1 to be confirmed. For example, as shown in FIG. 3, the three-phase instantaneous effective value obtained by converting the load voltage is displayed so that it can be compared with existing data such as the compensation performance (e.g., Class 2, 3, etc.) defined in standards such as JEC2433 and target performance determined thereon. The analysis results output by the analysis unit 83 are then transmitted by the communication unit 81 to the server device 9 via a communication network.

[0039] The internal power supply 84 is a battery that supplies power to the communication unit 81, the operation data storage unit 82, and the analysis unit 83.

[0040] Here, the operation of the external storage device 8 in the event of an abnormality will be described with reference to FIG.

[0041] First, the abnormality detection unit 71 determines whether or not there is an abnormality in the power system 10 based on various types of operation data detected by the operation data detection unit 3 (step S1). When an abnormality in the power system 10 is detected, the abnormality detection unit 71 outputs an abnormality detection signal to the circuit breaker control unit 72 and the power converter control unit 73 to start compensation operation, and at the same time, the abnormality detection unit 71 also outputs the abnormality detection signal to the operation data external output unit 74 (step S2).

[0042] If the power system 10 is normal, the abnormality detection unit 71 determines whether or not there is an abnormality in the uninterruptible power supply system 1 based on the various operation data detected by the operation data detection unit 3 (step S3). When an abnormality in the uninterruptible power supply system 1 is detected, the abnormality detection unit 71 outputs an abnormality detection signal to the operation data external output unit 74.

[0043] The operation data external output unit 74, which has received the abnormality detection signal, transmits the operation data acquired from the operation data detection unit 3 to the external storage device 8 (step S4). Upon receiving the operation data, the external storage device 8 automatically analyzes the operation data and creates a report (step S5), which is transmitted to the server device 9, which is a higher-level control unit.

[0044] According to the power supply system 100 of this embodiment configured as described above, operational data is stored in an external storage device 8 connected to the control device 7 of the uninterruptible power supply system 1 so as to be capable of data communication. This external storage device 8 does not need to use a high-performance memory equivalent to that of the control device 7, so that inexpensive memory can be used as the external storage device 8, thereby reducing costs and achieving a sufficiently large storage capacity. This allows, for example, the operation records of the uninterruptible power supply system 1 during a communication network failure due to an abnormality in the power grid 10 to be preserved without loss. Furthermore, because the external storage device 8 has a shock-resistant and heat-resistant structure, damage to the internal memory can be reduced and the loss of stored operational data can be prevented even in the event of an accident such as a fire.

[0045] The present invention is not limited to the above-described embodiment. For example, in the above embodiment, the external storage device 8 is configured to acquire and store operation data from the control device 7 when an abnormality occurs in the power grid 10 or the uninterruptible power supply system 1, but this is not limiting. In other embodiments, the external storage device 8 may be configured to continue acquiring and storing operation data from the control device 7 when the power grid 10 and the uninterruptible power supply system 1 are normal.

[0046] In addition, in the above embodiment, the external storage device 8 is installed outside the uninterruptible power supply system 1, but this is not limited to this. In other embodiments, the external storage device 8 may be installed inside the uninterruptible power supply system 1, as shown in FIG.

[0047] Furthermore, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications are possible without departing from the spirit of the present invention. [Explanation of symbols]

[0048] 100 Power Supply System 10...Electric power system 30 Load L1...power line 1. Uninterruptible Power Supply System 2 Circuit breaker 3. Operation data detection section 4. Energy storage unit 6. Power Converter 7. Control device 71 Abnormality detection unit 72 Circuit breaker control section 73 Power converter control section 8...External storage device 81 Communications Department 82 Operation data storage unit 83...Analysis Department 84...Internal power supply 9. Server device

Claims

1. an uninterruptible power supply system of a continuous commercial power supply type that supplies power to a load from a power system when the power system is normal, and cuts off the power supply from the power system to the load when an abnormality occurs in the power system, and supplies power to the load from an energy storage unit; A power supply system comprising: an external storage device having a shock-resistant and heat-resistant structure, connected to a control device provided in the uninterruptible power supply system so as to be capable of data communication, and which acquires and stores operational data relating to the operation of the uninterruptible power supply system in the event of an abnormality in the power grid or the uninterruptible power supply system.

2. 2. The power supply system according to claim 1, wherein the external storage device is installed outside the uninterruptible power supply system.

3. 3. The power supply system according to claim 1, wherein the external storage device continues to acquire and store operational data from the uninterruptible power supply system even when the power grid or the uninterruptible power supply system is operating normally.

4. a server device for monitoring the status of the uninterruptible power supply system and remotely controlling the same; The power supply system according to any one of claims 1 to 3, wherein the external storage device is configured to transmit the operational data acquired from the uninterruptible power supply system to the server device via a network.

5. 5. The power supply system according to claim 1, wherein the operational data includes one or more types of data selected from a grid voltage, a grid current, a load voltage, a load current, an output voltage of the uninterruptible power supply system, an output current, an air temperature, a humidity, or a state of the energy storage unit.

6. The power supply system according to any one of claims 1 to 5, wherein in the event of an abnormality in the power grid or the uninterruptible power supply system, the external storage device is configured to analyze the acquired operational data and automatically output the analysis results.

7. 7. The power supply system according to claim 6, wherein the external storage device outputs the analysis results in a format that enables confirmation of the compensation operation performance of the uninterruptible power supply system.

8. 8. The power supply system according to claim 1, wherein the external storage device has an internal power supply.

Images