Power distribution control system, power distribution facility and power distribution control method

Abstract

To provide a power distribution control system, a power distribution facility and a power distribution control method which can realize efficient power consumption using renewable energy.SOLUTION: A power distribution control system comprises: power storage means for storing power from a first power distribution system for supplying power generated by a centralized power generation source and a second power distribution system for distributing power generated by a distributed power generation source using renewable energy, and supplying the stored power to a load; and power distribution control means for controlling supply of power from the power storage means so that power transmission from the power storage means to a centralized power generation source side is suppressed when the power transmission from the power storage means to the centralized power generation source side is detected on the basis of a current value measured between the power storage means and the centralized power generation source.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a power distribution control system, power distribution facilities, and a power distribution control method, and more particularly to a power distribution control system, power distribution facilities, and a power distribution control method for controlling power distribution facilities that utilize power generated by distributed power sources.

Background Art

[0002] In view of achieving a decarbonized society from the perspectives of environmental protection and resource conservation, for example, distributed power generation sources that distribute power generation facilities using renewable energy such as solar power and wind power around the power consumption area to supply power have been attracting attention in recent years.

[0003] Patent Document 1 discloses a power generation device that transmits power generated using renewable energy to the power grid, and a storage battery that charges the power generated by this power generation device and can transmit the charged power to the power grid, and a technique for controlling the transmission of power from the storage battery to the power grid.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, as the use of distributed power sources attracts attention, power distribution facilities that realize distributed power sources in a state of being connected to an AC system that supplies power from a commercial AC power source are introduced, and there are scattered consumers who transmit power from the distributed power source to the AC system and sell electricity.

[0006] Here, when introducing power distribution facilities that realize a distributed power source in a state of being interconnected with an AC power system, it is necessary to install a battery with a large storage capacity. However, since this type of battery is expensive, there are also consumers who give up on introducing a distributed power source.

[0007] Furthermore, when introducing such power distribution facilities, from the perspective of ensuring the safety of the power distribution facilities connected to the grid and the perspective of smoothly promoting grid connection, consumers need to introduce power distribution facilities from manufacturers of power distribution facilities that have received strict and high-level certifications in grid connection protection device certifications (JET certifications) and the like when introducing power distribution facilities.

[0008] In this way, factors such as the high cost burden of the battery and the restrictions due to JET certification hinder the promotion of the introduction of distributed power sources, while the needs of consumers who want to achieve efficient power consumption using renewable energy are also strongly present.

[0009] The present invention has been made in view of the above circumstances, and an object thereof is to provide a power distribution control system, power distribution facilities, and a power distribution control method capable of realizing efficient power consumption using renewable energy.

Means for Solving the Problems

[0010] The power distribution control system according to the present invention for achieving the above object includes a power storage means for storing power from a first power distribution system that supplies power generated by a centralized power source and a second power distribution system that distributes power generated by a distributed power source using renewable energy, and supplying the stored power to a load, and a power distribution control means for controlling the supply of power from the power storage means so that power transmission from the power storage means to the centralized power source side is suppressed when power transmission from the power storage means to the centralized power source side is detected based on a current value measured between the power storage means and the centralized power source.

[0011] According to this, since the power storage means for storing the power from the centralized power source and the power from the distributed power source using renewable energy directly supplies power to the load, power consumption using renewable energy is realized.

[0012] Furthermore, when power transmission from the power storage means to the centralized power source side (reverse power flow) is detected, the power transmission from the power storage means to the centralized power source side is suppressed, so there is no restriction when introducing the distributed power source, and the introduction of the distributed power source is not inhibited.

[0013] Therefore, efficient power consumption using renewable energy can be realized.

[0014] This power distribution control system includes a plurality of power storage means that are respectively provided corresponding to a plurality of loads and supply power to the plurality of loads respectively.

[0015] Furthermore, this power distribution control system includes ammeter means for measuring the current value between the power storage means and the centralized power source, includes power distribution facilities having the power storage means and power distribution control means, and ammeter means for measuring the current value between the power storage means and the centralized power source is provided in the power distribution facilities.

[0016] The power distribution facilities according to the present invention for achieving the above object store the power from the first power distribution system that supplies the power generated by the centralized power source and the second power distribution system that distributes the power generated by the distributed power source using renewable energy, and supply the stored power to the load. And based on the current value measured between the power storage means and the centralized power source, when power transmission from the power storage means to the centralized power source side is detected, power supply control means for controlling the power supply from the power storage means so that the power transmission from the power storage means to the centralized power source side is suppressed.

[0017] The power distribution control method according to the present invention for achieving the above object is such that when the power distribution control means detects power transmission from the power storage means to the centralized power generation source based on the current value measured between the power storage means that stores power from a first power distribution system that supplies power generated by a centralized power generation source and a second power distribution system that distributes power generated by a distributed power generation source using renewable energy and supplies the stored power to a load, the power supply from the power storage means is controlled so as to suppress the power transmission from the power storage means to the centralized power generation source side.

Advantages of the Invention

[0018] According to this invention, efficient power consumption using renewable energy can be realized.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

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Figure 7

Embodiments for Carrying Out the Invention

[0020] Next, based on the drawings, the power distribution control system according to each embodiment of the present invention will be described.

[0021] Prior to the description of the power distribution control system according to each embodiment of the present invention, first, based on FIG. 1, an overview of the power consumption area to which the power distribution control system according to each embodiment is applied will be described.

[0022] As shown in the figure, in a power consumption area E where a plurality of houses 100 of a plurality of consumers 1 that consume power are aggregated, an AC voltage from an AC system 201 that distributes power from a centralized power source 200 having a large-scale power generation facility such as a thermal power plant of an electric utility company is formed to be distributable.

[0023] (First Embodiment) Next, based on FIGS. 2 to 6, the power distribution control system according to the first embodiment of the present invention will be described.

[0024] FIG. 2 is a block diagram for explaining an outline of the configuration of the power distribution control system. As shown in the figure, the power distribution control system 10 includes a power generation device 20 and power distribution facilities 30. In this embodiment, this power distribution control system 10 is respectively installed in a plurality of houses 100 of a plurality of consumers 1 shown in FIG. 1.

[0025] The power generation device 20 is, in this embodiment, a device that generates power by renewable energy using a solar power generation panel, which is a distributed power source having a small-scale power generation facility, and supplies the generated power to the power distribution facilities 30.

[0026] The power distribution facilities 30 include, in this embodiment, a first power distribution system D1 that distributes an AC voltage from the centralized power source 200 into the power distribution facilities 30 via a commercial AC power distribution line 201a that constitutes the AC system 201, a second power distribution system D2 that distributes a DC voltage from the power generation device 20 into the power distribution facilities 30, and a power distribution control device 40 that is a power distribution control means.

[0027] In this embodiment, the first power distribution system D1 includes, on its system, a watt-hour meter 31, a distribution board 32, a current sensor 33 which is current measurement means, a plurality of inverters 34a to 34n, a plurality of storage batteries 35a to 35n which are storage means, and a plurality of loads 36a to 36n.

[0028] In this embodiment, the watt-hour meter 31 detects the amount of power consumed by the loads 36a to 36n in the power distribution facility 30 as an electricity consumption value, and communicates the detected electricity consumption value to the electric utility that manages the centralized power generation source 200. For example, it may be implemented by a smart meter.

[0029] In this embodiment, the distribution board 32 distributes the power supplied to the power distribution facility 30 within the power distribution facility 30, and includes a breaker that shuts off the power supply when a current equal to or greater than a specified value is detected or when a leakage is detected.

[0030] In this embodiment, the current sensor 33 measures the current value between the storage batteries 35a to 35n and the centralized power generation source 200, which will be described later, and the measured current value is acquired by the power distribution control device 40, which will be described later.

[0031] The inverters 34a to 34n are provided with a DC / DC converter that controls the amount of power stored in the storage batteries 35a to 35n to be maximized based on the power generation amount of the power generation device 20. In this embodiment, a receiving device capable of communicating with the power distribution control device 40, which will be described later, is built in.

[0032] In this embodiment, the storage batteries 35a to 35n are, for example, lithium-ion secondary batteries or capacitors of a plug-in type (a method of inserting a power plug into an outlet). The power generated by the power generation device 20 and the power from the centralized power generation source 200 are stored, and the stored power is supplied to the loads 36a to 36n described below.

[0033] It is not necessary that the storage batteries 35a-35n are connected to all of the loads 36a-36n in the power distribution equipment 30, and when discharge occurs from the storage batteries 35a-35n, power may be distributed to the loads 36a-36n to which the storage batteries 35a-35n are not connected.

[0034] The loads 36a to 36n are devices that consume the power supplied from the storage batteries 35a to 35n, and are constituted by, for example, televisions, cooling and heating appliances such as air conditioners, cooking utensils, and other electrical appliances related to household facilities.

[0035] In this embodiment, the second power distribution system D2 includes an inverter 37, a distribution board 32 that is arranged on the same system as the first power distribution system D1 and shared with the first power distribution system D1, a current sensor 33, inverters 34a-34n, storage batteries 35a-35n, and a plurality of loads 36a-36n on its system.

[0036] That is, the second power distribution system D2 is configured to be able to distribute the DC voltage from the power generation device 20 to the power distribution facility 30 together with the AC voltage from the centralized power generation source 200 via the first power distribution system D1 (system interconnection).

[0037] The inverter 37 includes a DC / DC converter that steps up or steps down the DC voltage while keeping it as a DC voltage. This DC / DC converter may be one that constantly monitors the power generation device 20 by maximum power point tracking (MPPT) control, for example, and controls the power generation device 20 to operate at an operating point where maximum output can be obtained.

[0038] In this embodiment, the power distribution control device 40 is implemented by, for example, a computer or any information processing terminal having a hardware configuration similar to that of a computer.

[0039] FIG. 3 is a block diagram illustrating an outline of the configuration of the power distribution control device 40. As shown in FIG.

[0040] As shown in the figure, the power distribution control device 40 mainly includes a processor 41, a memory 42, a storage 43, a transceiver 44, and an input / output unit 45, which are electrically connected to each other via a bus 46.

[0041] The processor 41 is an arithmetic device that controls the operation of the power distribution control device 40, controls the transmission and reception of data between elements, and performs processes necessary for executing an application program.

[0042] In this embodiment, the processor 41 is, for example, a CPU (Central Processing Unit), and executes an application program developed in the memory 42 described below to perform each process.

[0043] The memory 42 is implemented by a main memory device composed of a volatile storage device such as a DRAM (Dynamic Random Access Memory).

[0044] This memory 42 is used as a working area for the processor 41, and stores a BIOS (Basic Input / Output System) executed when the power distribution control device 40 is started, various setting information, and the like.

[0045] The storage 43 stores data and the like used for various processes by an application program or the like.

[0046] The transceiver 44 may conform to a wireless communication standard such as Wi-Fi, or may be equipped with a short-range communication interface such as Bluetooth (registered trademark) or BLE (Bluetooth Low Energy).

[0047] In this embodiment, it is configured to be communicable with a receiving device built in the inverters 34a to 34n arranged upstream of the storage batteries 35a to 35n via Wi-Fi.

[0048] To the input / output unit 45, an information input device such as a touch pad or an output device such as a display is connected as necessary. In this embodiment, a display is connected.

[0049] The bus 46 transmits, for example, address signals, data signals, and various control signals among the connected processor 41, memory 42, storage 43, transceiver 44, and input / output unit 45.

[0050] FIG. 4 is a block diagram for explaining the outline of the functions of the power distribution control device 40. As shown in the figure, the power distribution control device 40 includes a current value acquisition unit 40a, an effective power calculation unit 40b, and a power distribution control unit 40c.

[0051] These current value acquisition unit 40a, effective power calculation unit 40b, and power distribution control unit 40c are realized by the processor 41 executing the program stored in the memory 42.

[0052] The current value acquisition unit 40a acquires, within the power distribution facility 30, the current value between the storage batteries 35a to 35n and the centralized power generation source 200 measured by the current sensor 33. That is, it acquires the current value on the customer 1 side that manages the power distribution facility 30, rather than on the AC system 201 side.

[0053] In this embodiment, the effective power calculation unit 40b calculates the effective power by multiplying the instantaneous values of the voltage and current based on the current value acquired by the current value acquisition unit 40a.

[0054] In this embodiment, this effective power calculation unit 40b detects the direction of the current value measured by the current sensor 33 according to whether the calculated effective power is "positive" or "negative". For example, if the calculated effective power is a "negative" value, it is detected that the measured current value is a current flowing from the storage batteries 35a to 35n toward the centralized power generation source 200.

[0055] In this embodiment, a current flowing from the storage batteries 35a to 35n toward the centralized power source 200 occurs when the power supplied from the storage batteries 35a to 35n to the loads 36a to 36n exceeds the power consumed by the loads 36a to 36n.

[0056] In this embodiment, when a current flowing from the storage batteries 35a to 35n toward the centralized power source 200 is detected, the power distribution control unit 40c communicates with the storage batteries 35a to 35n via Wi-Fi in the transceiver unit 44 and controls the supply of power from the storage batteries 35a to 35n so as to suppress power transmission from the storage batteries 35a to 35n to the centralized power source 200 side.

[0057] FIG. 5 is a block diagram for explaining an outline of the processing of the power distribution control unit 40c. As shown in the figure, when the supply capacity of the storage battery 35a that supplies power to the load 36a is 3 kWh, if the power consumption of the load 36a is 3 kWh, no current flows from the storage battery 35a toward the centralized power source 200 side.

[0058] Furthermore, when the supply capacity of the storage battery 35b that supplies power to the load 36b is 3 kWh, if the power consumption of the load 36b is 2 kWh, the 1 kWh of power not consumed by the load 36b becomes a current flowing from the storage battery 35b toward the centralized power source 200 side.

[0059] In this case, the power distribution control unit 40c controls the storage battery 35b so as to suppress the supply of power from the storage battery 34b to the load 36b (reduce it from 3 kWh to 2 kWh).

[0060] On the other hand, when the supply capacity of the storage battery 35n that supplies power to the load 36n is 3 kWh, if the power consumption of the load 36n is 5 kWh, although no current flows from the storage battery 35n toward the centralized power source 200 side, the supply power from the storage battery 35n alone cannot cover the power consumption of the load 36n.

[0061] In this case, the necessary power is supplied to the load 36n from the first power distribution system D1 or the second power distribution system D2. For example, when discharge occurs from another storage battery 35a, the power discharged from the storage battery 35a is supplied to the load 36n via the power distribution network in the power distribution facility 30.

[0062] Next, an outline of the processing of the power distribution control system 10 will be described.

[0063] FIG. 6 is a flowchart for explaining an outline of the processing of the power distribution control system 10. As shown in the figure, first, in step S1, the current sensor 33 measures the current values between the storage batteries 35a to 35n and the centralized power generation source 200. The current values measured by the current sensor 33 are acquired by the current value acquisition unit 40a of the power distribution control device 40.

[0064] In the subsequent step S2, based on the current values acquired by the current value acquisition unit 40a, the effective power calculation unit 40b calculates the effective power value.

[0065] Next, in step S3, when it is detected by the current value measured by the current sensor 33 that the current is flowing from the storage batteries 35a to 35n toward the centralized power generation source 200 (when the calculated effective power value is a "negative" value), in step S4, the power distribution control unit 40c controls the supply of power from the storage batteries 35a to 35n to the loads 36a to 36n, which is the factor causing the current to flow from the storage batteries 35a to 35n toward the centralized power generation source 200.

[0066] In this way, since the storage batteries 35a to 35n that store the power from the centralized power generation source 200 and the power from the power generation device 20, which is a distributed power generation source using renewable energy, directly supply power to the loads 36a to 36n, power consumption using renewable energy is realized.

[0067] Moreover, in the present embodiment, since a plurality of storage batteries 35a to 35n are provided corresponding to the plurality of loads 36a to 36n respectively and supply power to the plurality of loads 36a to 36n respectively, it is only necessary to provide a storage battery with a capacity sufficient to supplement the power consumption of a single load.

[0068] Therefore, even in a power distribution facility having a power distribution system (second power distribution system D2) from a distributed power source connected to the AC power system 201 (first power distribution system D1), since it is not necessary to provide a storage battery with a large storage capacity, the introduction cost of the storage battery can be reduced.

[0069] Furthermore, when power transmission from the storage batteries 35a to 35n to the centralized power source 200 side is detected, the power transmission from the storage batteries 35a to 35n to the centralized power source 200 side is suppressed. Therefore, there is no restriction when introducing a distributed power source, and the introduction of the distributed power source is not hindered.

[0070] Therefore, efficient power consumption using renewable energy can be realized.

[0071] (Second Embodiment) Next, based on FIG. 7, a power distribution control system according to the second embodiment of the present invention will be described.

[0072] In FIG. 7, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0073] As shown in the figure, the power distribution control system 10 is provided with a power generation device 20n using a plug-in type (a method of inserting a power plug into an outlet) solar power generation panel connected to the inverter 34n instead of any one of the plurality of storage batteries 35a to 35n.

[0074] In the present embodiment, the power generated by this power generation device 20n is stored in the storage batteries 35a to 35n or supplied to the loads 36a to 36n via the power distribution network in the power distribution facility 30.

[0075] On the other hand, when a current is generated from the power generation device 20n toward the centralized power source 200, the power distribution control unit 40c of the power distribution control device 40 controls the supply of power from the power generation device 20n so that the power transmission from the power generation device 20n to the centralized power source 200 is controlled.

[0076] Note that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

[0077] In the above-described embodiments, the case where the functions of each part are realized by the program stored in the computer on which the power distribution control device 40 is mounted has been described. However, the functions of each part of the power distribution control device 40 may be implemented by a hardware configuration.

[0078] In the above-described embodiments, the case where the power distribution facility 30 is installed in the house 100 of the consumer 1 has been described. However, it may be installed in business facilities such as offices and factories, or commercial facilities such as stores.

[0079] In the above-described embodiments, the case where the power generation device 20 and the power generation device 20n are devices that generate power by renewable energy using solar power generation panels has been described. However, for example, they may be devices that generate power by various renewable energies such as wind power generation and geothermal power generation.

[0080] Note that when the power plugs of the storage batteries 35a to 35n are accidentally unplugged, a safety device that sets the voltage of the storage batteries 35a to 35n to 0 may be provided. For example, a physical switch is provided on the power plugs of the storage batteries 35a to 35n, and it is assumed that when the power plugs of the storage batteries 35a to 35n are unplugged, the switch is turned on and the voltage becomes 0.

[0081] Furthermore, the storage batteries 35a to 35n and the loads 36a to 36n may be connected in series or in parallel.

Description of Reference Numerals

[0082] 1. Need home 10. Power distribution control system 20, 20n power generation device 30. Power distribution equipment 35a~35n storage battery (energy storage means) 40. Power distribution control device (power distribution control means)

Claims

1. Power storage means for storing power from a first power distribution system that supplies power generated by a centralized power source and a second power distribution system that distributes power generated by a distributed power source using renewable energy, and while storing the power, supplying the stored power to a load; Power distribution control means for controlling the supply of power from the power storage means so that when power transmission from the power storage means to the centralized power source side is detected based on a current value measured between the power storage means and the centralized power source, the power transmission from the power storage means to the centralized power source side is suppressed; A power distribution control system comprising the above.

2. Comprising a plurality of power storage means respectively provided corresponding to a plurality of the loads and supplying the power to the plurality of the loads respectively; The power distribution control system according to Claim 1.

3. Comprising ammeter means for measuring the current value between the power storage means and the centralized power source; The power distribution control system according to Claim 1 or 2.

4. Comprising power distribution facilities having the power storage means and the power distribution control means; In the power distribution facilities, ammeter means for measuring the current value between the power storage means and the centralized power source is provided; The power distribution control system according to Claim 1 or 2.

5. Power storage means for storing power from a first power distribution system that supplies power generated by a centralized power source and a second power distribution system that distributes power generated by a distributed power source using renewable energy, and while storing the power, supplying the stored power to a load; Power distribution control means for controlling the supply of power from the power storage means so that when power transmission from the power storage means to the centralized power source side is detected based on a current value measured between the power storage means and the centralized power source, the power transmission from the power storage means to the centralized power source side is suppressed; Power distribution facilities comprising the above.

6. The power distribution control means: Based on a current value measured between a power storage means for storing power from a first power distribution system that supplies power generated by a centralized power source and a second power distribution system that distributes power generated by a distributed power source using renewable energy, and while storing the power, supplying the stored power to a load, and the centralized power source, controls the supply of power from the power storage means so that when power transmission from the power storage means to the centralized power source side is detected, the power transmission from the power storage means to the centralized power source side is suppressed; A power distribution control method.

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