JP5963326B2 - Storage battery device and storage battery control system - Google Patents

Description

  Embodiments described herein relate generally to a storage battery device and a storage battery control system.

  Conventionally, power purchasers (electric power consumers, etc.) from commercial systems perform peak shift and peak cut as part of energy saving. The peak shift is a method of suppressing the power consumption at the time of a normal power charge during the daytime when the power consumption is the largest, and shifting the power consumption to a time zone of an inexpensive power charge at night. In addition, the peak cut is due to the fact that the annual contract power peak in the daytime normal electricity rate is generated by the cooling power in the summer, etc. It is a method to suppress. Each of these peak shifts and peak cuts is a method in which electric power is stored in a storage battery and the stored electric power is discharged in a time zone where it is desired to reduce the electric power charge.

  In order for power consumers to automatically realize peak shift and peak cut operations without performing special operations such as switching between the commercial grid and storage battery, the storage battery output and load must be connected to the commercial grid. It is common to connect them in parallel. In this case, the storage battery is appropriately charged and discharged with respect to the commercial system, and the load is also configured to consume the load with an appropriate balance from both the commercial power source and the storage battery.

  During the discharge of the storage battery, when the load power is larger than the discharge power amount, all the discharge power amount is consumed by the load, and if there is a shortage, it is supplemented from the commercial system. For this reason, the amount of power discharged from the storage battery becomes the amount of power saving with respect to the amount of power purchased from the commercial system, and the purpose of energy saving can be achieved without problems.

  However, when the load power consumption is smaller than the discharge power of the storage battery, the difference becomes surplus power. When this surplus power flows out to the commercial system, a reverse power flow occurs. This reverse power flow causes the voltage of the commercial system to change higher than specified or causes waveform distortion, which degrades the quality of system power, which is also a public resource, and has a negative impact on general power users. It becomes.

  In order to guarantee the quality of commercial grid electricity to be supplied, an electric power company that is a power supplier establishes and regulates an operation rule for reverse power flow (Non-Patent Document 1). A power supply system connected to a commercial system must prevent a reverse power flow from a power supply device such as a storage battery device connected to the power system to the commercial system.

  Therefore, in general, a current sensor such as an instrument transformer CT is installed in the high-voltage power receiving facility to detect reverse power flow, and the detection signal is sent to the storage battery device via the reverse power relay RPR (general Is used as a contact signal). And when reverse power flow occurs, it controls to stop discharge from a storage battery to a commercial system (for example, refer to patent documents 1).

JP 2013-172514 A

Grid interconnection regulations JEAC9701 (JESC E0019)

  As described above, conventionally, in order to prevent reverse power flow in a system connected to a commercial power line, an instrument transformer CT and a reverse power relay RPR are provided in a high-voltage power receiving facility, and the detection signal is transmitted by a power supply device. It was set as the structure returned to a certain storage battery apparatus, and when reverse power flow generate | occur | produced, it controlled to stop discharge. In addition, a transducer TRD is provided to convert the reverse power flow into a control current value in an analog manner, and return that value as a control signal to the storage battery, so that the reverse power flow does not occur. The storage battery device was controlled to the amount of electric power.

  In that case, installation of instrument transformer CT, reverse power relay RPR, transducer TRD, etc. to the high-voltage receiving cubicle is essential, so it is necessary to temporarily stop receiving high-voltage 6.6kV and perform installation work. There is.

  In particular, if the target property is a new building or the like, there is no particular problem if the building is completed and then energized when the entire system is in operation after the construction is completed. However, in the case of an existing building or a facility that is in operation, it is necessary to stop the facility that is operating in the power receiving system and generate a power failure once.

  The receiving point of high voltage 6.6kV is on the highest side of the property receiving system, and is the backbone of the electrical system of the entire building and equipment. End up.

  As a result, power outages will be forced on various facilities in operation, and the impact on general users (tenants) will be very large. This will result in temporary suspension of operations, waste of cost and time, and significant impact on economic activities. It is.

  Moreover, since the handling of construction management is high-voltage electrical equipment construction, supervision of the chief electrical engineer is required by law, and it is a heavy burden on construction, such as labor costs and schedule adjustment of the engineer.

  Even in actual work, because of the high-voltage equipment work of 6.6kV, it is necessary for the practitioners to engage a limited number of engineers with high-level technical skills. Labor and safety such as safety management and work procedures The administrative burden is large.

  As described above, conventional methods that require the installation of a high-voltage power receiving facility, such as an instrument transformer CT, a reverse power relay RPR, or a transducer TRD, which are reverse power detectors, are problematic in terms of cost, time, safety management, etc. was there.

  An object of the present invention is to provide a storage battery that can automatically realize peak shift and peak cut operations without performing a special operation such as switching between a commercial system and a storage battery while preventing reverse power flow. It is providing a device and a storage battery control system.

In order to achieve the above object, an embodiment of the present invention is a storage battery device that is connected to a commercial system, and is a load discharge that is consumed by a load device that is operated by power supply from the commercial system or the storage battery device. The load energy is input from the load device as a control signal, and the load device consumes the load discharge power based on the read load discharge power amount and the load discharge power amount reading means for monitoring the load discharge power amount in real time. Storage battery discharge power amount control means for controlling the storage battery discharge power amount of the storage battery device so that the discharge power amount is equal to the load discharge power amount
It is a storage battery device characterized by having.

In addition, another embodiment includes a storage battery device that is connected to a commercial system, and a load device that is operated by power supply from the commercial system or the storage battery device, and the storage battery device is connected to the commercial system. A storage battery control system for controlling operation, wherein the storage battery device inputs a load discharge power amount consumed by the load device from the load device as a control signal and monitors the load discharge power amount in real time. A storage battery for controlling the storage battery discharge power amount of the storage battery device based on the read load discharge power amount reading means and the discharge power amount equal to the load discharge power amount consumed by the load device based on the read load discharge power amount A storage battery control system comprising: a discharge power amount control means.

The block diagram which shows the storage battery control system by embodiment of this invention. The block diagram which shows the structure of the storage battery apparatus which is the principal part structure of the storage battery control system by embodiment of this invention. The schematic diagram which shows the Example of the storage battery control system to which this invention is applied. The block diagram which shows the circuit structure of the storage battery control system to which this invention is applied.

  FIG. 1 is a configuration diagram showing a storage battery control system to which an embodiment of the present invention is applied.

  The storage battery control system 1 shown in FIG. 1 includes a high-voltage power reception cubicle 3 connected to a commercial system, a load device 5 connected to the high-voltage power reception cubicle 3, and a storage battery device connected to the high-voltage power reception cubicle 3 and the load device 5. 7. The high voltage cubicle, the load device 5, and the storage battery device 7 are connected to each other by a power supply line 9.

  The high-voltage power receiving cubicle 3 steps down the commercial power supply voltage received at 6.6 kV to 200 V (or 100 V) and supplies it to the load device 5 and the storage battery device 7.

  The load device 5 includes a power circuit 51 and a control circuit 53, and the power circuit 51 and the control circuit 53 are connected by a control signal line 55. The control signal line 55 is branched and connected as a branch control signal line 57 to supply a control signal to the storage battery device 7. The control signal transmitted through the control signal lines 55 and 57 is the discharge power amount of the load device 5 monitored in real time, and the discharge power amount is supplied to the storage battery device 7 via the branch control signal line 57. It has become.

  The storage battery device 7 includes a power circuit 71 and a control circuit 73 that controls the power circuit 71. The power circuit 71 is a main body of the storage battery, and is composed of, for example, a lithium ion storage battery.

  As shown in FIG. 2, the control circuit 73 includes a load discharge power amount reading unit 731, a data conversion unit 733, and a storage battery discharge power amount control unit 735. The load discharge power amount reading unit 731 inputs the discharge power amount consumed by the load device 5 from the load device 5 through the branch control signal line 57 as a control signal. The data conversion unit 733 converts the input control signal into data that can be used in the storage battery device 7 (for example, data in a CAN format described later). The storage battery discharge power amount control unit 735 controls the storage battery discharge power amount linked to the commercial system based on the read load discharge power amount.

<Example configuration>
FIG. 3 shows an embodiment to which the present invention is applied.

  As shown to Fig.3 (a), a present Example charges the battery of the electric vehicle 11 from the quick charger 5A as the load apparatus 5, and electric power is supplied from the storage battery apparatus 7 to the quick charger 5A. Has been. The control signal transmitted between the quick charger 5A as the load device 5 and the storage battery device 7 is edited as control data between the start bit and the stop bit as shown in FIG. 3 (b). Is transmitted.

  FIG. 4 shows a specific circuit configuration of the storage battery device 7 in the embodiment of the storage battery control system of FIG.

  In FIG. 4, the commercial power supply voltage from the high-voltage power receiving cubicle 3 is supplied to the storage battery device 7 via an earth leakage circuit breaker ELCB (Earth Limited Circuit Breaker) inserted in the feeder 9 and an electromagnetic contactor MC. In the storage battery device 7, it is converted into direct current by the AC / DC converter 715 via the insulation transformer 75, further converted into a desired direct current voltage by the DC / DC converter 713, and then stored in the lithium ion battery 711. .

On the other hand, the commercial power supply voltage from the high-voltage power receiving cubicle 3 is branched downstream of the magnetic contactor MC, and is supplied to the quick charger 5A, which is a load device, via a circuit breaker MCCB (Molded Case Circuit Breaker) and a protective FUSE. Have been supplied. The supplied commercial power supply voltage is converted into a DC voltage by an AC / DC converter 511 and supplied to a load such as an electric vehicle 11. A panel charger 531 as a control device is provided in the quick charger 5 </ b> A as a load device, and the amount of discharge power supplied to the electric vehicle 11 as a load by the panel connector 531 is measured. Note that the panel controller 531 and the AC / DC converter 511 to be measured communicate with each other by the RS-232C method. The measured discharge power amount data is converted into control data in a bit string as shown in FIG. 3B by the conversion unit 535, and the branch control signal line (Ethernet (registered trademark)) 57 is transmitted from the transmission control controller 537. Is transmitted to the storage battery device 7 as a control signal. The controller 737 of the storage battery device 7 constitutes the control circuit 73 shown in FIG. 2, and executes control signal transfer control based on the CAN (Controller Area Network) standard. Note that CAN is a standard designed for enhancing noise resistance and used for data transfer between interconnected devices. The controller 737 obtains storage battery discharge power amount data from the load discharge power amount data and supplies it to a battery management unit (BMU) 739 provided in each lithium ion battery. The BMU 739 controls the amount of power discharged to the commercial system based on the storage battery discharge power amount data. That is, only the amount of power corresponding to the amount of power consumed on the quick charger 5A (load device 5) side is taken out and converted into a commercial AC voltage by the DC / DC converter 713 and the AC / DC converter 511. After that, it is discharged to the commercial system in real time.

<Effect>
According to the present embodiment, since only the amount of power equal to the amount of power consumed by the quick charger 5A is automatically supplied from the storage battery device 7 in real time, the reverse power flow to the commercial system is generated in principle. Never do. For this reason, there is no need to detect power consumption on the high-voltage power receiving side.

  Moreover, according to this embodiment, it is not necessary to construct the high-voltage power receiving cubicle 3 in which the high-voltage power receiving equipment is accommodated, and the construction site is the quick charger that is the control circuit 73 of the storage battery device 7 and the load device 5. Since only the so-called weak electric system of the 5A control circuit 53 and only the communication control relationship, the system configuration becomes extremely simple.

  Therefore, the power outage area can be limited to a part of the 200V system breaker in the low voltage system below 6.6 kV. If the breaker is limited to the storage battery device 7 and the quick charger 5A (load device 5), the power failure can be applied only in that device to a limited range.

  As a result, a power outage does not reach the entire building, and construction can be performed with minimal impact on economic activities. Moreover, since supervision of the electrical chief engineer is not required, construction can be performed quickly and at low cost in terms of labor costs and scheduling.

  Practical work also involves laying communication cables, adding control and communication equipment, and software testing. No special qualified personnel are required for construction, and it can be carried out at a management level equivalent to repair of general electronic equipment. In terms of construction management, the risk of electric shock and work management can be greatly reduced, saving time and costs.

  Further, the control signal line 55 for transmitting the control signal is simply branched into two using the RS-232C type cable inside the load device 5 (for example, the quick charger 5A) and is taken out as the branch control signal line 57. Since it can be transmitted to the storage battery device 7 alone, time and cost can be greatly reduced. As described above, according to the present embodiment, it is possible to automatically realize peak shift and peak cut operations without performing a special operation such as switching between a commercial system and a storage battery while preventing reverse power flow. Can do.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

1: storage battery control system, 3: high voltage receiving cubicle, 5: load device, 5A: quick charger, 7: storage battery device, 9: power supply line, 51: power circuit, 53: control circuit, 55: control signal line, 57 : Branch control signal line, 71: power circuit, 73: control circuit, 711: lithium ion battery,
731: Load discharge power amount reading unit, 733: Data conversion unit, 735: Discharge power amount control unit

Claims (3)

A storage battery device connected to a commercial system,
Load discharge that is input from the load device as a control signal the load discharge power amount consumed by the load device operated by the power supply from the commercial system or storage battery device, and reads the load discharge power amount in real time An electric energy reading means;
Based on the read load discharge power amount, storage battery discharge power amount control means for controlling the storage battery discharge power amount of the storage battery device so that the discharge power amount is equal to the load discharge power amount consumed by the load device;
A storage battery device comprising: A storage battery control system that includes a storage battery device that is connected to a commercial system and a load device that is operated by power supply from the commercial system or the storage battery device, and controls the connection operation of the storage battery device to the commercial system. There,
The storage battery device
Load discharge electric energy consumed by the load device is input from the load device as a control signal, and load discharge electric energy reading means for monitoring the load discharge electric energy in real time,
Based on the read load discharge power amount, storage battery discharge power amount control means for controlling the storage battery discharge power amount of the storage battery device so that the discharge power amount is equal to the load discharge power amount consumed by the load device;
A storage battery control system comprising: The control signal is communicated by the RS-232C system in the load device, and is supplied to the load discharge power amount reading means of the storage battery device including the load discharge power amount data consumed by the load device. The storage battery control system according to claim 2.

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