WO2018021130A1

WO2018021130A1 - Electricity storage system, charging and discharging control device and control method, and recording medium having program recorded thereon

Info

Publication number: WO2018021130A1
Application number: PCT/JP2017/026215
Authority: WO
Inventors: 一男森
Original assignee: 日本電気株式会社
Priority date: 2016-07-26
Filing date: 2017-07-20
Publication date: 2018-02-01
Also published as: JP2019193317A

Abstract

The objective of the present invention is to provide an electricity storage system, a charging and discharging control device and control method, and a program, which can be easily and relatively inexpensively installed by retrofitting to a photovoltaic power generation system that has already been installed, and with which electric power to be limited when the output power of a photovoltaic power generating facility is being limited can be utilized efficiently to the maximum extent. To this end, the electricity storage system is provided with an electricity storage device and a charging and discharging control device which controls charging and discharging of the electricity storage device. A PV panel is connected to a PV-PCS via a direct-current power cable. The PV-PCS connects the direct-current power cable to an alternating-current power cable, and converts direct-current power into alternating-current power. The alternating-current power cable is connected to a power grid and is connected to the PV panel via the PV-PCS. Upon detecting that the output from the direct-current power generating device is being limited, the charging and discharging control device, which is connected to the direct-current power cable between the PV panel 12 and the PV-PCS, controls the charging current of the electricity storage device to maximize the electricity storage device charging power or the PV panel output power.

Description

Power storage system, charge / discharge control device, control method thereof, and recording medium recording program

The present invention relates to a power storage system, a charge / discharge control device, a control method thereof, and a recording medium on which a program is recorded.

An example of a power conditioner for connecting a DC power generation facility such as a solar power generation facility to a power system such as a commercial power supply is described in Patent Document 1. The power conditioner of Patent Document 1 has a function of charging the storage battery with the power to be suppressed while executing the system voltage increase suppression control when the system voltage exceeds a predetermined voltage. Thereby, when the system voltage rises, the electric power generated by the DC power generation facility can be effectively used.

When the solar power generation system described in Patent Document 2 acquires output suppression information that instructs output suppression via a communication network from a command center installed by an electric power company or the like, for example, the boiling operation of an electric water heater is performed. When possible, the output suppression is released, and the electric power used for the electric water heater boiling operation is calculated using the power generated by the photovoltaic power generation system.

When the power generation system described in Patent Document 3 detects a voltage increase such that the system voltage exceeds a predetermined threshold, the output voltage on each distributed power source (natural power generation device or fuel cell power generation device) is decreased, Voltage rise suppression control is performed so as to be lower than the voltage value on the system power side.
In Patent Document 4, the output voltage of the solar cell is converted into AC power, and the power can be reversely flowed to the system distribution line, and the output voltage of the inverter is suppressed so that the system voltage does not exceed a predetermined upper limit value. An interconnected inverter device including an output voltage suppression unit is described.

The following analysis is given by the present invention. As described in Non-Patent Documents 1 and 2, due to the rapid increase in distributed power sources (power generation devices) using renewable energy centered on sunlight, surplus power flowing backward to the power system has increased in recent years. There is a problem that the power system becomes unstable.

In Non-Patent Document 1, it is expected that it will become difficult to stably supply power with rapid expansion of renewable energy centered on sunlight in a certain area. It is described that output control is performed when the amount is exceeded. Here, the output control is to limit the amount of power that flows backward to the power system in order to stabilize the power system. Specifically, in the output control, the amount of power generated in the power generation apparatus is controlled to a predetermined amount of power by PCS (Power Conditioning System), and reverse power flows to the power system. In the future, it is also stated that small solar power generation equipment for home use is scheduled to be subject to output control.

Non-Patent Document 2 describes an operation method of output control in a photovoltaic power generation facility. The operation method varies depending on whether the purchase contract of generated power is purchase of all or surplus, and in the case of surplus purchase, if the private power consumption exceeds the output control value (% of the rated output of the PCS), go to the power grid The reverse power flow = 0 can be controlled. That is, the control is such that the amount of power generated by the power generation apparatus−the amount of private power consumption = 0.

JP 2012-139019 A Japanese Patent Laying-Open No. 2015-106937 JP 2012-138888 A JP-A-9-172784

As described in the above-mentioned patent document and non-patent document, output suppression information (command value) is transmitted via a communication network from a command station installed by a power company or the like when a system voltage rises in a photovoltaic power generation system. For example, PV-PCS (PhotoVoltaics Power 太陽光 Conditioning 太陽光 System) will perform output suppression control, but in order not to waste as much as possible the power that can be generated by the solar power generation facility, It is conceivable to charge the storage battery without suppressing the power to be suppressed.

The power conditioner (PCS) of Patent Literature 1 includes a converter that boosts DC power from a DC power generation facility such as a solar power generation facility, and an inverter that converts the boosted DC power into AC power and supplies the AC power to the power system. The converter (which also performs charge / discharge control) that converts the DC power of the power storage unit to a voltage is connected between the DC links (DC link unit). Has the ability to charge.

However, since many photovoltaic power generation systems that have already been installed and operated do not have a function of charging the storage battery when the output is suppressed, output suppression information (command value) will be obtained from the command station installed by the power company. If the frequency is increased and the frequency is increased, a large amount of power is wasted.

Therefore, for example, the existing PV-PCS is replaced with a PCS as in Patent Document 1, that is, a PCS (multi-source type) that can be connected to a plurality of DC power sources such as a solar power generation facility and a storage battery and can be integratedly controlled. Although it is conceivable to add a storage battery above, there are many problems such as high costs and a review of the entire system.

The present invention has been made in view of the above circumstances, and the object of the present invention is that it can be easily and relatively inexpensively installed in an existing solar power generation system by retrofitting, and the output of the solar power generation facility To provide a power storage system, a charge / discharge control device, a control method thereof, a program charge / discharge control device, a control method thereof, and a recording medium recording the program, which can efficiently and maximally use power to be suppressed at the time of suppression. is there.

In each aspect of the present invention, the following configurations are adopted in order to solve the above-described problems.

The first aspect relates to a power storage system.
The power storage system according to the first aspect is
Power storage means;
Control means for controlling charging and discharging of the power storage means;
With
The DC power generator is connected to the converter via a DC power line,
The conversion device connects the DC power line and the AC power line, and converts DC power into AC power,
The AC power line is connected to a power system, is connected to the DC power generation device via the conversion device,
The power storage means is connected to the DC power line between the DC power generator and the converter, and the control means
When it is detected that the output of the DC power generation device is being suppressed, the charging current of the power storage unit is controlled so that the charging power of the power storage unit or the output power of the DC power generation device is maximized.

The second aspect relates to a charge / discharge control device.
The charge / discharge control device according to the second aspect is
A charge / discharge control device connected to a power storage device,
The DC power generator is connected to the converter via a DC power line,
The conversion device connects the DC power line and the AC power line, and converts DC power into AC power,
The AC power line is connected to a power system, is connected to the DC power generation device via the conversion device,
Connected to the DC power line between the DC generator and the converter,
The charge / discharge control device comprises:
Control that controls the charging current of the power storage device so that the charging power of the power storage device or the output power of the DC power generation device is maximized when it is detected that the output of the DC power generation device is being suppressed. Have means.

A 3rd side is related with the control method of the charging / discharging control apparatus performed by at least 1 computer.
The control method of the charge / discharge control device according to the third aspect is as follows:
A control method of a charge / discharge control device for controlling charge / discharge of a power storage device,
The DC power generator is connected to the converter via a DC power line,
The conversion device connects the DC power line and the AC power line, and converts DC power into AC power,
The AC power line is connected to a power system, is connected to the DC power generation device via the conversion device,
Connected to the DC power line between the DC generator and the converter,
The charge / discharge control device comprises:
When it is detected that the output of the DC power generation device is being suppressed, the charging current of the power storage device is controlled so that the charging power of the power storage device or the output power of the DC power generation device is maximized. Including that.

As another aspect of the present invention, there may be a program for causing at least one computer to execute the method of the third aspect, or a computer-readable recording medium recording such a program. May be. This recording medium includes a non-transitory tangible medium.
This computer program includes computer program code that, when executed by a computer, causes the computer to perform its control method on the charge / discharge control device.

It should be noted that an arbitrary combination of the above-described components and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

The various components of the present invention do not necessarily have to be independent of each other. A plurality of components are formed as a single member, and a single component is formed of a plurality of members. It may be that a certain component is a part of another component, a part of a certain component overlaps with a part of another component, or the like.

In addition, although a plurality of procedures are described in order in the method and computer program of the present invention, the order of description does not limit the order in which the plurality of procedures are executed. For this reason, when the method and computer program of the present invention are implemented, the order of the plurality of procedures can be changed within a range that does not hinder the contents.

Furthermore, the plurality of procedures of the method and computer program of the present invention are not limited to being executed at different timings. For this reason, another procedure may occur during the execution of a certain procedure, or some or all of the execution timing of a certain procedure and the execution timing of another procedure may overlap.

According to each of the above aspects, it is possible to install the existing photovoltaic power generation system by retrofitting easily and at a relatively low cost, and efficiently and efficiently use the power that should be suppressed when suppressing the output of the photovoltaic power generation equipment. A power storage system, a charge / discharge control device, a control method thereof, and a recording medium on which a program is recorded can be provided.

It is a schematic block diagram which shows the structural example of a solar energy power generation system. It is a schematic block diagram which shows the structural example of the electrical storage system which concerns on embodiment of this invention. It is a figure for demonstrating PV output electric power and PV output suppression. It is a figure for demonstrating PV output electric power and PV output suppression. It is a figure for demonstrating PV output electric power and PV output suppression. It is a functional block diagram which shows logically the structure of the charging / discharging control apparatus which concerns on embodiment of this invention. It is a figure which shows an example of a structure of the computer which implement | achieves the charging / discharging control apparatus of this embodiment. It is a flowchart which shows an example of operation | movement of the charging / discharging control apparatus of this embodiment. It is a functional block diagram which shows the logical structure of the charging / discharging control apparatus which concerns on this embodiment. It is a block diagram which shows the principal part structure of the electrical storage system which concerns on this embodiment. It is a flowchart which shows an example of operation | movement of the charging / discharging control apparatus of this embodiment. It is a figure which shows an example of the data structure of the information memorize | stored in the memory | storage device of this embodiment. It is a figure which shows an example of the data structure of the information memorize | stored in the memory | storage device of this embodiment. It is a flowchart which shows an example of operation | movement of the charging / discharging control apparatus of this embodiment. It is a figure which shows an example of the data structure of the information memorize | stored in the memory | storage device of this embodiment. It is a figure which shows an example of the data structure of the information memorize | stored in the memory | storage device of this embodiment. It is a schematic block diagram which shows the structural example of the electrical storage system which concerns on embodiment of this invention. It is a schematic block diagram which shows the structural example of the electrical storage system which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.

(First embodiment)
The power storage system according to the first embodiment of the present invention will be described below.
FIG. 1 is a schematic block diagram illustrating a configuration example of a photovoltaic power generation (PV: PhotoVoltaics) system 10.
FIG. 2 is a schematic block diagram showing a configuration example of the power storage system 1 according to the embodiment of the present invention. The power storage system 1 shows a configuration after the power storage device 40 is added to the DC power line 16 side of the existing PV system 10 of FIG.
In each drawing of the present specification, the configuration of parts not related to the essence of the present invention is omitted and is not shown.

The existing PV system 10 of FIG. 1 includes a PV panel 12, a PV-PCS (PhotoVoltaics Power Conditioning System) 14, a distribution board 24, and a load 26. In the present embodiment, it is assumed that the PV panel 12 and the PV-PCS 14 are installed outdoors, and the distribution board 24 and the load 26 are installed indoors.
The above is an example, and there is a system in which PV-PCS is installed indoors. In addition, at least one of the distribution board 24 and the load 26 (or part of them) may be installed outdoors.

The PV panel 12 and the PV-PCS 14 are connected by a DC power line 16 (shown by a broken line).
The PV-PCS 14, the distribution board 24, and the power system 22 are connected by an AC power line 28 (shown by a one-dot chain line (28a, 28b)). A load 26 is further connected to the AC power line 28 (28a, 28b) via a distribution board 24.

The PV panel 12 includes a plurality of solar cells that receive solar light energy and converts them into electricity, and is protected by tempered glass or acrylic resin. For example, the PV panel 12 is installed on a roof of a residence.
The DC power generated by the PV panel 12 is input to the PV-PCS 14 through the DC power line 16. The PV-PCS 14 has a function of converting DC power generated by the PV panel 12 into AC power generally used in home appliances (load 26).

The PV-PCS 14 receives, for example, an output suppression control signal 32 (hereinafter also referred to as a PV output suppression signal) for the PV panel 12 from the external server 30 or the like, and outputs the PV panel 12 according to the PV output suppression signal 32. And has a function of outputting to the AC power line 28 (28a). The PV output suppression signal 32 includes, for example, an instruction to suppress the output to a predetermined ratio (%) of the rated output of the PV-PCS 14.

That is, when the PV output suppression signal 32 instructs to suppress the output to 80% of the rated output of the PV-PCS 14, the PV-PCS 14 converts the DC power output from the PV panel 12 into AC power. At this time, it is suppressed to 80% of the rated output of the PV-PCS 14 and output to the AC power line 28a, and the power exceeding 80% is not output to the AC power line 28a. That is, the PV output suppression signal 32 sets the upper limit of the PV output power amount.

The load 26 is at least one of various electric devices such as an air conditioner, a lighting device, a refrigerator, a television, a microwave oven, a dryer, a personal computer, a game machine, a telephone, a water heater, an electric vehicle, and a plug-in hybrid vehicle. There is no particular limitation.

Electricity is supplied from the electric power system 22 to the distribution board 24 of the customer's house via the power transmission network, and electricity is distributed to each load 26 via the distribution board 24.
Also, the DC power generated by the PV panel 12 is input to the PV-PCS 14 via the DC power line 16, is converted into AC power, and is output to the AC power line 28a. Then, it can be supplied to the load 26 through the distribution board 24 through the AC power line 28a.

In addition to consuming the power generated by the PV panel 12 at the load 26 of the consumer, the surplus can be reversely flowed to the power system 22 via the distribution board 24 and sold.
Alternatively, surplus power generated by the PV panel 12 may be charged to a power storage device (not shown) connected to the AC power line 28a side as much as possible without causing the power system 22 to reversely flow, or to the DC power line 16 side. For example, the connected lithium ion secondary battery of the battery system 42 may be charged by the power storage device 40 according to the embodiment of the present invention. This configuration will be described later as a configuration example that may be implemented in combination with the embodiment of the present invention.

In the present embodiment, the PV-PCS 14 also has a function of adjusting the power obtained from the PV panel 12. The electric power obtained from the PV panel 12 varies in current and voltage depending on the amount of solar radiation and temperature, and the characteristics always change. The output of the PV panel 12 can be maximized by always controlling the current and voltage of the output of the PV panel 12 so that the power obtained by the product of the current and the voltage becomes the maximum power point. This control is called maximum power point tracking (MPPT) control, and is executed by, for example, the PV-PCS 14.

The PV-PCS 14 constantly monitors the state of the power system connected on the AC power line 28 side, and suppresses the output of the inverter (output of the PV panel 12) when the system voltage exceeds a predetermined voltage. (One of the grid connection protection functions).

Hereinafter, the case where the PV-PCS 14 does not suppress the output (FIG. 3A) and the case where the output suppression by the PV output suppression signal 32 is performed (FIGS. 3B and 3C) will be described.
First, the case where the PV-PCS 14 does not suppress the output, that is, the case where the PV output suppression signal 32 is not received (and the system voltage does not exceed the predetermined voltage) will be described. As shown in FIG. 3A, the difference portion (hatched portion) between the power generation amount (solid line) of the PV panel 12 and the power consumption amount (broken line) of the load 26 is the power generated by the PV panel 12 and output from the PV-PCS 14. Of this, the surplus power is not consumed by the load 26. This surplus power is reversely flowed (sold) into the power system 22. However, as described above, if the storage battery is charged, discharged in a dischargeable time zone, and supplied to the load 26, it is efficiently used without being wasted. Available. This configuration will be described later as a configuration example that may be implemented in combination with the embodiment of the present invention.

Next, the case where the PV-PCS 14 performs output suppression by the PV output suppression signal 32 will be described. First, in the case of purchasing the entire amount in which there is no load 26 and sells the entire amount, as shown in FIG. 3B, when the generation amount suppression control is performed by the PV output suppression signal 32, the generation amount (PV− The power output from the PCS 14) is suppressed to the PV output suppression line. In other words, the hatched portion is not output from the PV-PCS 14 and cannot be sold and is wasted. (If the power generated by the PV panel 12 is suppressed and cannot be sold, the battery is charged and discharged when the suppression instruction by the PV output suppression signal 32 is released, so that the power can be efficiently used without wasting it. .)

On the other hand, in the case of surplus purchase with the load 26, as shown in FIG. 3C, when the suppression control of the power generation amount is performed by the PV output suppression signal 32, the power output from the PV-PCS 14 is reduced to the PV output suppression line. Or it is suppressed so that it may become the electric power generation amount similar to the private power consumption amount by the load 26 (the reverse power flow to the electric power system becomes zero). In this case, the output-suppressed power (hatched portion) above the PV output suppression line and above the private power consumption is not output from the PV-PCS 14 and cannot be used.

In order to suppress the PV-PCS 14 so that the amount of power generated is the same as the amount of private power consumed by the load 26 (the reverse power flow to the power system is zero), the PV-PCS 14 is, for example, a power distribution It is necessary to detect the direction (and magnitude) of the current flowing through the AC power line 28b by using a clamp-type AC current sensor (not shown) installed on the AC power line 28b between the panel 24 and the power system 22.

As shown in FIG. 2, the power storage device 40 of this embodiment includes a battery system 42 and a charge / discharge control device 100. The power storage device 40 is electrically connected to the DC power line 16 between the PV panel 12 and the PV-PCS 14 via the connection line 17. The charge / discharge control apparatus 100 of this embodiment controls charge / discharge of the battery system 42 connected to the PV system 10. Moreover, although the electrical storage apparatus 40 in this embodiment shall be installed outdoors, you may install indoors.

The battery system 42 includes at least one lithium-ion secondary battery (not shown) (hereinafter also referred to as “storage battery”) and a battery management unit (Battery Management Unit) that manages the lithium ion secondary battery. BMU). The battery system 42 has an electric capacity indicated by a rated capacity (kWh) that can be charged by the system. In the battery system 42, charging / discharging of the storage battery is controlled by the charging / discharging control device 100.

Further, in the present embodiment, although detailed description is omitted, in the charge / discharge control of the storage battery, the charge / discharge control is performed within a predetermined range with respect to the rated capacity of the storage battery.

In this embodiment, when the PV output suppression signal 32 is received or the system voltage exceeds a predetermined voltage, the output from the PV panel 12 is suppressed when the PV-PCS 14 is executing the output suppression control. Efficiently charge and use the storage battery without suppressing it. The electric power charged in the storage battery can be efficiently used without being wasted if it is discharged and supplied to the load 26 in a dischargeable time zone.

In the present embodiment, for this purpose, when the power storage device 40 is connected to the DC power line 16 between the PV panel 12 and the PV-PCS 14 and it is detected that the output of the PV panel 12 is being suppressed, the suppression is performed. To be able to charge the power that is being used.

Here, when the PV-PCS 14 is under the output suppression control, the MPPT control by the PV-PCS 14 is not performed. Therefore, instead of the PV-PCS 14, the power storage device 40 performs charging while performing MPPT control, whereby the power output from the PV panel 12 is extracted to the maximum and charged.

FIG. 4 is a functional block diagram logically showing the configuration of the charge / discharge control apparatus 100 according to the embodiment of the present invention. Hereinafter, the configuration of the charge / discharge control apparatus 100 of the present embodiment will be described with reference to FIGS.

The DC power generator (PV panel 12) is connected to the converter (PV-PCS 14) via the DC power line 16.
The converter (PV-PCS 14) connects the DC power line 16 and the AC power line 28a, and converts DC power into AC power.
The AC power lines 28 (28a, 28b) are connected to the power system 22 from the converter (PV-PCS 14), and are connected to the DC power generator (PV panel 12) via the converter (PV-PCS 14). .
A power storage device 40 (battery system 42) is connected to the DC power line 16 between the DC power generator (PV panel 12) and the converter (PV-PCS 14).

The charge / discharge control apparatus 100 according to the present embodiment includes an acquisition unit 102 and a control unit 104.
When it is detected that the output of the DC power generation device (PV panel 12) is being suppressed, the control unit 104 determines the charging current of the power storage device 40 (battery system 42) as the power storage device 40 (battery system 42). Control is performed so that the charging power or the output power of the DC power generator (PV panel 12) is maximized.

The charge / discharge control device 100 of this embodiment may be further connected to a storage device 110 (not shown) so as to be accessible. The storage device 110 may be included in the charge / discharge control device 100 or may be a device external to the charge / discharge control device 100. In the present embodiment, the storage device 110 may be realized by a memory 84 or a storage 85 of the computer 80 shown in FIG.

In the present embodiment, the control by the control unit 104 corresponds to the above-described MPPT control.
The control unit 104 receives the PV output suppression signal 32 out of the electric power that can be output from the PV panel 12, or performs MPPT control on the electric power whose output from the PV-PCS 14 is suppressed due to the system voltage exceeding a predetermined voltage. , The electric power output from the PV panel 12 is extracted to the maximum and charged.

As shown in FIG. 3C, when the control of the amount of power generation of the PV panel 12 is performed by the PV output suppression signal 32, the power output from the PV-PCS 14 is the power consumption by the load 26 up to the PV output suppression line. The amount of power generation is the same as the amount of power (for example, the reverse power flow to the power system becomes zero). In the present embodiment, the control unit 104 charges the storage battery with electric power (hatching unit) that suppresses the output from the PV-PCS 14 that is above the PV output suppression line and that is above the self-power consumption. At this time, the control unit 104 performs MPPT control on the charging power, thereby maximizing the power output from the PV panel 12 and realizing efficient charging.

The control unit 104 may also control discharge of the storage battery.
For example, instead of the power supplied from the power system 22 or the PV panel 12 to the load 26, the power charged in the storage battery can be discharged from the storage battery and supplied to the load 26. Specifically, when the PV panel 12 is not generating power at night or the like, the battery may be discharged, or the power consumption of the load 26 is only by the power supplied from the PV panel 12 while the PV panel 12 is generating power. When it cannot cover, you may discharge from a storage battery and supply to the load 26. FIG. In the above case, it is a condition that the control for suppressing the power generation amount of the PV panel 12 is not performed. Further, the power charged in the storage battery may be reversely flowed to the power system 22.

When performing MPPT control, the control unit 104 uses the charging current and charging voltage of the power storage device (battery system 42) or the output current and voltage of the PV panel 12 acquired by the acquiring unit 102. The charging power can be calculated from the values of the storage battery charging current and charging voltage, and the output power can be calculated from the output current and voltage values of the PV panel 12. For these, the measured values of a current sensor and a voltage sensor described later can be used.

In this specification, “acquisition” means that the device itself obtains data or information stored in another device or storage medium (active acquisition), for example, requests or inquires of another device. Receiving data, accessing and reading out other devices and storage media, etc., and inputting data or information output from other devices into the device (passive acquisition), for example, distribution (or , Transmission, push notification, etc.) and / or receiving received data or information. It also includes selecting and acquiring from received data or information, or selecting and receiving distributed data or information.

The power storage system 1 of the present embodiment includes a power storage device 40 and clamp type DC

current sensors

44, 46, and 48 as shown in FIG. Each clamp type DC

current sensor

44, 46, 48 corresponds to the acquisition unit 102, and the current value measured by each sensor is used for control by the control unit 104 of the charge / discharge control device 100.

The clamp type DC current sensor 44 is provided in the connection line 17 between the DC power line 16 and the power storage device 40 and measures the current flowing through the connection line 17.

The clamp type direct current sensor 46 is provided on the first direct current power line 16a between the connection position of the power storage device 40 on the direct current power line 16 and the PV panel 12, and measures the current flowing through the first direct current power line 16a.

The clamp type DC current sensor 48 is provided on the second DC power line 16b between the connection position with the power storage device 40 on the DC power line 16 and the PV-PCS 14, and measures the current flowing through the second DC power line 16b.

Furthermore, in the power storage system 1 of this embodiment, the voltage value of the power output from the PV panel 12 is measured by a voltage sensor (not shown), and the acquisition unit 102 also acquires this voltage value. The output (power generation amount) of the PV panel 12 may be calculated from this voltage value and the current value measured by the clamp type DC current sensor 46.

Furthermore, the voltage value of the charging power of the storage battery of the power storage device 40 (battery system 42) is measured by a voltage sensor (not shown), and the acquisition unit 102 also acquires this voltage value. The charging power of the storage battery may be calculated from this voltage value and the current value measured by the clamp type DC current sensor 44.

In this embodiment, although the detection method of the output of PV panel 12 being suppressed is illustrated below, it is not limited to these. Moreover, you may combine the following plurality.
(A1) Obtain or refer to information regarding the PV output suppression signal 32 received by the PV-PCS 14 from an external device.
(A2) Charging the storage battery is performed on a trial basis to monitor whether the current input to the PV-PCS 14 decreases. When the current does not decrease, it is determined that the PV output suppression control is being performed.

According to (a2) above, it is possible to determine whether or not the PV output is being suppressed even when the information regarding the PV output suppression signal 32 cannot be directly referred to.

The MPPT control method is not particularly limited in the present invention, but for example, a so-called hill climbing method, incremental conductance method, scanning method, or the like may be used. The control unit 104 performs MPPT control so that the charging current of the power storage device (battery system 42) is maximized, or the charging power of the power storage device (battery system 42) or the output power of the DC power generation device (PV panel 12) is maximized. Just do it.

FIG. 5 is a diagram illustrating an example of the configuration of a computer 80 that implements the charge / discharge control apparatus 100 of the present embodiment.
The computer 80 of the present embodiment includes a CPU (Central Processing Unit) 82, a memory 84, a computer program 90 that realizes the components of the charge / discharge control device 100 loaded in the memory 84, a storage 85 that stores the computer program 90, An I / O (Input / Output) 86 and a network connection interface (communication I / F 87) are provided.

The CPU 82, the memory 84, the storage 85, the I / O 86, and the communication I / F 87 are connected to each other via the bus 89, and the entire charge / discharge control apparatus 100 is controlled by the CPU 82. However, the method of connecting the CPUs 82 and the like is not limited to bus connection.

The memory 84 is a memory such as a RAM (Random Access Memory) or a ROM (Read Only Memory). The storage 85 is a storage device such as a hard disk, an SSD (Solid State Drive), or a memory card.

The storage 85 may be a memory such as a RAM or a ROM. The storage 85 may be provided inside the computer 80 or may be provided outside the computer 80 and connected to the computer 80 by wire or wireless as long as the computer 80 is accessible. Alternatively, the computer 80 may be detachably provided.

The CPU 82 reads out the computer program 90 stored in the storage 85 to the memory 84 and executes it, whereby each function of each unit of the charge / discharge control device 100 can be realized.

The I / O 86 performs input / output control of data and control signals between the computer 80 and other input / output devices. The other input / output devices include, for example, an input device (not shown) such as a keyboard, a touch panel, a mouse, and a microphone connected to the computer 80, and an output device (not shown) such as a display, a printer, and a speaker, These input / output devices and the interface of the computer 80 are included. Further, the I / O 86 may perform data input / output control with a reading or writing device (not shown) of another recording medium.

The communication I / F 87 is a network connection interface for performing communication between the computer 80 and an external device. The communication I / F 87 is not always necessary. The communication I / F 87 may be a network interface for connecting to a wired line or a network interface for connecting to a wireless line. For example, the computer 80 that implements the charge / discharge control apparatus 100 may be connected to a HEMS (Home Energy Management System) via a network by the communication I / F 87.

Each component of the charge / discharge control apparatus 100 of this embodiment is realized by an arbitrary combination of hardware and software of the computer 80 in FIG. It will be understood by those skilled in the art that there are various modifications to the implementation method and apparatus. The functional block diagram showing the charge / discharge control device of each embodiment to be described below shows a block of logical functional units, not a configuration of hardware units.

Further, the charge / discharge control apparatus 100 does not exclude a configuration including a plurality of computers 80.

The computer program 90 of the present embodiment charges the power storage device (battery system 42) when the computer 80 for realizing the charge / discharge control device 100 detects that the output of the PV panel 12 is being suppressed. It is described that a procedure for controlling the current so that the charging power of the power storage device (battery system 42) or the output power of the DC power generation device (PV panel 12) is maximized is executed.

The computer program 90 of this embodiment may be recorded on a recording medium that can be read by the computer 80. The recording medium is not particularly limited, and various forms can be considered.
The computer program 90 may be loaded from a recording medium into the memory 84 of the computer 80, or may be downloaded to the computer 80 through a network and loaded into the memory 84.

The recording medium for recording the computer program 90 includes a medium that can be used by the non-transitory tangible computer 80, and a program code that can be read by the computer 80 is embedded in the medium. When the computer program 90 is executed on the computer 80, the computer 80 is caused to execute the following control method for realizing the charge / discharge control apparatus 100.

A control method of the charge / discharge control apparatus 100 of the present embodiment configured as described above will be described below.
FIG. 6 is a flowchart showing an example of the operation of the charge / discharge control apparatus 100 of the present embodiment.
The control method according to the embodiment of the present invention is a control method of the charge / discharge control device 100, and is a control method executed by the computer 80 that implements the charge / discharge control device 100.
When the charge / discharge control device 100 detects that the output of the DC power generation device (PV panel 12) is being suppressed (YES in step S101), the control method of the present embodiment is a power storage device (battery system 42). ) Is controlled so that the charging power of the power storage device (battery system 42) or the output power of the DC power generation device (PV panel 12) is maximized (step S103).

Specifically, in the charge / discharge control device 100, when it is detected that the output of the PV panel 12 is being suppressed (YES in step S101), the control unit 104 detects each sensor acquired by the acquisition unit 102. Based on the measured value, the charging current of the storage battery of the battery system 42 is controlled so that the charging power of the storage battery or the output power of the PV panel 12 is maximized (step S103).

As a result, regarding the power whose output is suppressed by the PV output suppression signal 32, even when the MPPT control is stopped in the PV-PCS 14, the charging current charged in the storage battery by the charge / discharge control device 100 is controlled by the MPPT control. Thus, the output of the PV panel 12 can be maximized.

As described above, in the charge / discharge control device 100 of this embodiment, when it is detected that the output of the PV panel 12 is being suppressed, the control unit 104 performs MPPT control (charging current of the storage battery of the battery system 42). Is controlled so that the charging power of the storage battery or the output power of the PV panel 12 is maximized), the output of the PV panel 12 can be maximized to efficiently charge the surplus power.

That is, according to the power storage system 1 of the present embodiment, it is a configuration that can be retrofitted easily and relatively inexpensively to an existing photovoltaic power generation system, and only by controlling the power storage system 1 alone, The electric power that should be suppressed when the output of the photovoltaic power generation facility is suppressed can be efficiently and maximized.

(Second Embodiment)
Next, a power storage system according to the second embodiment of the present invention will be described below.
FIG. 7 is a functional block diagram showing a logical configuration of the charge / discharge control apparatus 100 according to the present embodiment.
In the present embodiment, the charge / discharge control device 100 acquires information related to the PV output suppression signal 32 received by the PV-PCS 14 and determines whether or not the PV output is being suppressed based on the information. explain. The configuration of the present embodiment can be combined with other embodiments.

The charge / discharge control apparatus 100 of this embodiment includes an acquisition unit 102, a control unit 104, and an information acquisition unit 106. The acquisition unit 102 and the control unit 104 have the same configuration as the charge / discharge control device 100 of FIG.

In the charge / discharge control apparatus 100 of the present embodiment, the information acquisition unit 106 acquires information related to an instruction to suppress the output of the PV panel 12 from an external apparatus (PV-PCS 14 or external server 30).

Specifically, the information acquisition unit 106 receives at least one of the presence / absence of reception of the PV output suppression signal 32 in the PV-PCS 14, the PV output suppression time, and information indicating that the PV output suppression control is being performed. You may get it. The information acquisition unit 106 may be configured to receive the PV output suppression signal 32 directly from the server 30. In addition, the information acquisition unit 106 may inquire the server 30 or the PV-PCS 14 to acquire information related to the output suppression instruction of the PV panel 12.

When the charge / discharge control device 100 receives the PV output suppression signal 32, the charge / discharge control device 100 may communicate with the server 30 via a communication device (for example, a gateway, a router, etc.) not shown.

The control unit 104 determines whether or not the output of the PV panel 12 is being suppressed based on the information regarding the suppression instruction acquired by the information acquisition unit 106.
When it is detected that the output is being suppressed, the control unit 104 performs MPPT control of the output of the PV panel 12 to adjust the charging current of the storage battery, and performs charging control to the battery system 42.

The operation of the charge / discharge control device 100 of the present embodiment is the same as the operation of the charge / discharge control device 100 of the above-described embodiment of FIG. 6, but the information acquisition unit 106 determines that the PV output suppression signal 32 in step S101. When the information regarding is acquired, it is detected that the output of the PV panel 12 is being suppressed.

As described above, in the charge / discharge control device 100 of the present embodiment, the information acquisition unit 106 acquires information (for example, the PV output suppression signal 32) regarding the output suppression instruction of the PV panel 12, and based on the information. Thus, MPPT control can be performed when it is detected by the control unit 104 that PV output is being suppressed.
According to this configuration, it is possible to easily and reliably detect whether or not the PV output is being suppressed, based on the information related to the PV output suppression signal 32, while having the same effects as the above embodiment.

(Third embodiment)
Next, a power storage system according to the third embodiment of the present invention will be described below.
FIG. 8 is a block diagram showing a main configuration of the power storage system according to this embodiment.
The power storage system of the present embodiment is different from the power storage system of the above embodiment in determining whether or not PV output suppression is continuing without acquiring information related to the PV output suppression instruction (for example, the PV output suppression signal 32). It is different in that it has a configuration that can be performed.
In addition, since the structure of the charging / discharging control apparatus of this embodiment is the same as that of the charging / discharging control apparatus 100 of the said embodiment of FIG. 4, it demonstrates using FIG. Moreover, the structure of this embodiment can also be combined with the structure of the charging / discharging control apparatus of other embodiment.

In the charge / discharge control apparatus 100 of the present embodiment, the acquisition unit 102 acquires at least one of the direction and the magnitude of the DC power input to the PV-PCS 14.
Based on the change in at least one of the direction and the magnitude of the DC power acquired by the acquisition unit 102 when the charge amount to the power storage device (battery system 42) is increased by a predetermined amount, the control unit 104 It is determined whether the output of is being suppressed. When it is determined that the output of the PV panel 12 is being suppressed, the control unit 104 uses the charging current of the power storage device (battery system 42) as the charging power of the power storage device (battery system 42) or the PV panel 12. Is controlled so as to maximize the output power.

In the present embodiment, the control unit 104 is configured to charge the storage battery with the power that is output-suppressed and controlled by the PV output suppression signal among the power that can be output from the PV panel 12, but the control unit of the present invention is configured as follows. The charging / discharging control of the storage battery may be performed using a combination of at least one of a plurality of conditions exemplified below.
(B1) Charging / discharging is performed according to a predetermined first chargeable time zone and second dischargeable time zone of the storage battery.
In this configuration, information on the first time zone and the second time zone is stored in the storage device 110 in advance.
In the power storage device 40 of the present embodiment, it is assumed that a first time period in which the storage battery can be charged and a second time period in which the storage battery can be discharged are determined in advance. The first time zone is from 6:00 to 18:00, and the second time zone is from 18:00 to 6:00 on the next day.

Further, the charge / discharge control apparatus 100 has a timepiece (not shown) and acquires time information from the timepiece. Further, the timepiece may not be included in the charge / discharge control device 100 and may be a device external to the charge / discharge control device 100.

(B2) When the storage battery is fully charged, it is not charged.
In this configuration, the acquisition unit 102 may further acquire information indicating that the storage battery is fully charged from the BMU of the battery system 42.

(B3) When the storage battery is charged by a predetermined ratio (%) or more of the storage capacity, the charging is stopped.
In this configuration, a predetermined percentage (%) of the storage capacity of the storage battery is stored in advance in the storage device 110.

(B4) The charging / discharging of the storage battery is controlled according to the status of power purchase or power sale in the power system 22.
In this configuration, the acquisition unit 102 may further acquire information related to the current direction of the AC power line 28b on the power system 22 side that indicates the status of power purchase or power sale in the power system 22. This configuration will be described later as an example of a configuration that may be implemented in combination with the embodiment of the present invention.

(B5) When the remaining storage capacity of the storage battery is equal to or greater than the first threshold value or the free capacity is less than the second threshold value, charging of the storage battery is stopped.
In this configuration, the acquisition unit 102 may acquire information related to the remaining storage capacity or free capacity of the storage battery from the BMU of the battery system 42. The threshold value is stored in advance in the storage device 110. Each threshold may have a configuration that can be updated from the outside.

In the charge / discharge control apparatus 100 of the present embodiment configured as described above, various units as described above are realized as various functions by the CPU 82 of the computer 80 executing various processing operations corresponding to the computer program 90. The

The computer program 90 of this embodiment is a procedure for acquiring at least one of the direction and the magnitude of the DC power input to the PV-PCS 14 in the computer 80 for realizing the charge / discharge control device 100, a power storage device (battery system) 42) Whether or not the output of the PV panel 12 is being suppressed based on a change in at least one of the direction and the magnitude of the acquired direct current (electric power) when the charge amount to the predetermined amount is increased. Procedure for determining, when it is determined that the output of the PV panel 12 is being suppressed, the charging current of the power storage device (battery system 42) is determined as the charging power of the power storage device (battery system 42) or the output power of the PV panel 12. Is described so as to execute a procedure for controlling so as to be maximized.

A control method of the charge / discharge control apparatus 100 of the present embodiment configured as described above will be described below.
FIG. 9 is a flowchart showing an example of the operation of the charge / discharge control apparatus 100 of the present embodiment.
The control method according to the embodiment of the present invention is a control method of the charge / discharge control device 100, and is a control method executed by the computer 80 that implements the charge / discharge control device 100.
In the control method of the present embodiment, the direct current (power) acquired by the acquisition unit 102 when the charge / discharge control device 100 increases the amount of charge to the power storage device (battery system 42) by a predetermined amount (step S201). When it is determined whether the output of the PV panel 12 is being suppressed based on the change in at least one of the direction and the size (step S203), and it is determined that the output of the PV panel 12 is being suppressed In step S205, the charging current of the power storage device (battery system 42) is controlled so that the charging power of the power storage device (battery system 42) or the output power of the PV panel 12 is maximized (step S209). Including.

Details will be described below.
This processing routine may be repeatedly executed periodically. The period of periodically repeating is not particularly limited, and may be, for example, every several minutes, several tens of minutes, or every several tens of minutes. In addition, when it is known in advance that the PV output suppression instruction is specified in time units, for example, this processing routine may be executed only for a predetermined number of minutes at the beginning of every fixed time (repeated multiple times). May be)

First, the control unit 104 performs a short test charge. Here, a predetermined current value I3 (A) (for example, 1A) is charged for a short time (step S201). Note that the “short time” of the execution time for performing the test charging may be, for example, around 1 second, but is not limited thereto. Further, the short test charge may be repeated a plurality of times with a predetermined interval.

The current value I3 (A) of the test charge, the execution time, and the cycle and number of times when the test charge is repeatedly executed are the scale of the output of the PV panel 12, the method of MPPT control in the PV-PCS 14, and the response speed. It is preferable that the value is appropriately determined according to the above.

Also, the acquisition unit 102 measures the current value I2 (FIG. 8) input to the PV-PCS 14 of the DC power line 16b using the clamp type DC current sensor 48. The measurement is preferably performed at least before the start of the test charge and during the test charge in step S201.

The current value acquired by the acquisition unit 102 is stored in the storage device 110 together with time information as current value information 112 (FIG. 10A). (The information in the “Remarks” column in the figure does not have to be included in the current value information 112. It is described for explanation.) Then, the control unit 104 performs test charging (“before charging”). From the “charging” to “charging”), it is determined whether or not the current value I2 has decreased (step S203). If it has not decreased (NO in step S203), it is determined that the PV output is being suppressed (NO in step S203). Step S205).

In this embodiment (during PV output suppression), the current value I2 (A) in FIG. 10A is zero (0.0A). This is because the PV output suppression line by the PV-PCS 14 is zero% (0%). This is because the case where there is no power consumption by the load 26 (the same applies to the purchase of all the quantity) is described as an example.

On the other hand, the current value I2 (A) when the PV output is being suppressed but power is being output from the PV-PCS 14 to the AC side is a finite value that is not zero. In this case, during the test charge, the total current drawn from the PV panel increases, so the voltage of the PV panel decreases (according to the general IV characteristics in the PV panel), but the PV-PCS 14 sets the output power to a predetermined value. Therefore, the current value I2 (A) during the test charging slightly increases (in this case, since it does not decrease, it can be correctly determined that the PV output is being suppressed).

In this embodiment, the determination is based on the change in the current value I2 (A). However, the output power of the PV-PCS 14 may be estimated using the voltage value measured at the same time, and used for the determination. If the output power does not decrease (fluctuate) due to charging, it can be determined that the PV output is being suppressed.

Here, the difference between the current values of the current value information 112 is obtained and stored as the difference information 114 (FIG. 10B) together with the time information. (The information in the “Remarks” column in the figure does not have to be included in the difference information 114. It is described for the sake of explanation.) With reference to this difference information 114, whether or not the current value I2 has decreased. Can be determined. In addition, when short-time test charging is repeatedly performed at predetermined intervals, a difference between current values may be calculated as an average value from a plurality of measured values.

If the current value I2 has decreased (YES in step S203), it is determined that the PV output is not being suppressed, and the process ends.
On the other hand, if current value I2 does not decrease (NO in step S203) and it is determined that PV output is being suppressed (step S205), control unit 104 determines that the free capacity of the storage battery is a predetermined value (for example, the rated capacity). 30%) or more is determined (step S207). If it is equal to or greater than the predetermined value (YES in step S207), the control unit 104 executes MPPT control of the output of the PV panel 12 to adjust the charging current of the storage battery, and performs charging control to the battery system 42 (step S209). ).
If the free space is less than the predetermined value (NO in step S207), this process ends.

Thus, according to the charge / discharge control apparatus 100 of the present embodiment, whether or not the PV output is being suppressed can be detected without the PV output suppression signal 32, and further, while performing MPPT control, The charging process can be performed. Therefore, the electric power suppressed by the PV output suppression control can be efficiently charged to the storage battery while maximizing the output of the PV panel 12.

Furthermore, the process when the output suppression control of the PV panel 12 is canceled during the MPPT control by the charge / discharge control device 100 will be described with reference to the flowchart of FIG.
While the MPPT control is being performed by the control unit 104, this processing is periodically executed.

The period for periodically executing this processing is not particularly limited, but may be, for example, every several minutes, several tens of minutes, or every few tens of minutes. In addition, when it is known in advance that the PV output suppression instruction is specified in units of time, for example, this processing routine may be executed only for several minutes of switching at regular intervals (repeated multiple times). Also good).

In the following description, the precondition in the above description is taken over, and the current value I2 (A) during PV output suppression is zero (0.0A) (PV output suppression line by PV-PCS14 is zero% (0%) and load The case where there is no power consumption by H.26) will be described.

First, the control unit 104 decreases the charging current set by the MPPT control by a predetermined amount (step S221). Note that, unlike the case of FIG. 10, when the charging current is decreased by a predetermined amount, the charging current is not restored and the process proceeds to the next step S223 (determining whether or not the current value I2 has increased).
Further, the acquisition unit 102 measures the current value I2 (FIG. 8) input to the PV-PCS 14 of the DC power line 16b using the clamp type DC current sensor 48. The measurement is preferably performed at least before and after the test charging in step S221.

The current value acquired by the acquisition unit 102 is stored in the storage device 110 together with time information as current value information 113 (FIG. 12A). Furthermore, the difference between the current values of the current value information 113 is obtained and stored as the difference information 115 (FIG. 12B) together with the time information. With reference to the difference information 115, it can be determined whether or not the current value I2 has increased. (The information in the “Remarks” column in the figure does not have to be included in the current value information 113 or the difference information 115. It is described for explanation.)

And the control part 104 discriminate | determines whether the electric current value I2 increased before and after step S221 with reference to the difference information 115 (step S223), and when it increases (YES of step S223), PV output suppression It is determined that the control has been released (step S225).
(FIG. 12 is an example in the case where it is determined that the PV output suppression control has been released.) When the increase has not been made (NO in step S223), this processing is terminated assuming that the PV output suppression has not been released. . Note that the charging current decreased in step S221 may be returned to the original state before the end of this process, or the process may be shifted to MPPT control as it is.

Here, when it is determined that the PV output suppression control has been released (step S225), the MPPT control by the charge / discharge control device 100 may be stopped immediately, but the PV output suppression value has only been changed to a larger value. Therefore, the PV output suppression control itself may be ongoing. Therefore, in the present embodiment, the following processing is continued.

When determining that the PV output suppression control has been released (step S225), the control unit 104 reduces the charging current of the MPPT control by a predetermined amount (step S227). Similar to step S223, the current value I2 is measured before and after the change of the current value of the charging current in step S227, and it is determined whether or not the current value I2 has increased (step S229). Step S227 is repeated until the current value I2 does not increase, and the charging current is decreased by a predetermined amount. When the current value I2 does not increase (NO in step S229), this process is terminated, and the process returns to the MPPT control by the charge / discharge control device 100. Alternatively, when the charging current reaches almost zero, it is determined that the PV output suppression control has been released, and the process stops without returning to the MPPT control.

As described above, in the charge / discharge control apparatus 100 of the present embodiment, the direction and magnitude of the DC power acquired by the acquisition unit 102 when the control unit 104 increases the amount of charge to the storage battery by a predetermined amount. Based on at least one of the changes, it is determined whether or not the output of the PV panel 12 is being suppressed.

As described above, according to the charge / discharge control device 100 of the present embodiment, the same effects as those of the above-described embodiment can be achieved, and even when the PV output suppression signal 32 cannot be received (referenced), the output is suppressed. Power can be maximized by MPPT control, and the storage battery can be efficiently charged.

As described above, the embodiments of the present invention have been described with reference to the drawings. However, these are exemplifications of the present invention, and various configurations other than the above can be adopted.

<Boosting device>
For example, as another embodiment, as shown in FIG. 13, a booster 50 exists between the PV panel 12 and the PV-PCS 14, and the PV system 10 in which the booster 50 performs MPPT control is also used in the power storage of the present invention. The device 40 can be connected and controlled in the same manner as in the above embodiment.
The power storage device 40 of the present embodiment is connected to the DC power line 16b between the PV panel 12 and the booster device 50. Other than that is the same as that of the said embodiment.

According to this configuration, the same effects as those of the above embodiment can be obtained.

<MPPT control stop detection>
Furthermore, as another embodiment, the PV-PCS 14 or the booster device 50 may be configured to detect whether the MPPT control is in operation based on the output voltage and current values of the PV panel 12. . If the current and voltage fluctuation pattern of the output power of the PV panel 12 during the operation of the MPPT control by the PV-PCS 14 or the booster device 50 is known in advance, whether or not the MPPT control operation is performed accurately and easily using that information. Can be determined.

Further, as described above, there are several MPPT control methods.
Therefore, based on the analysis of characteristics obtained by monitoring the input / output of the PV-PCS 14 or the booster 50 (for example, the voltage and current fluctuation patterns of the output power of the PV panel 12 measured by each sensor), the MPPT It may be determined whether control is being performed.

Specifically, the fluctuation pattern of the voltage and current of the output power of the PV panel 12 is analyzed in advance, the fluctuation pattern during the operation of the MPPT control by the PV-PCS 14 or the booster 50 is extracted and learned, and the storage device 110. Using this as a learned variation pattern, it is determined whether MPPT control is in progress.

Furthermore, the control unit 104 may have an automatic tuning function based on the learning algorithm as described above, and can learn the operation of the MPPT control by the PV-PCS 14 or the booster 50 combined arbitrarily.

In the determination process, the voltage value and current value of the output power of the PV panel 12 are acquired by the acquisition unit 102, collated with the fluctuation pattern stored in the storage device 110, and determined to be in the operation of MPPT control. Good.

However, this determination may be made in combination with other conditions in other embodiments. For example, when the PV output suppression signal 32 is received, the stop of the MPPT control may be further confirmed by the method of the present embodiment, or when the stop of the MPPT control is detected by the method of the present embodiment, Therefore, test charging may be performed, and it can be comprehensively determined that the PV output is being suppressed.

When it is detected that the MPPT control is stopped in this way, the control unit 104 starts the MPPT control in the charge / discharge control device 100 instead of the PV-PCS 14 or the booster 50 and performs the charge control. Also good.

The embodiments of the present invention have been described above with reference to the drawings. However, various other configurations may be combined with the embodiments of the present invention.

<Green mode>
For example, the configuration described in FIG. 3A for charging surplus power so as not to sell power (reverse power flow) without the PV output suppression signal 32 can also be applied in combination with the present invention.
FIG. 14 is a diagram illustrating a configuration of the power storage system 1 of the present embodiment.
The power storage system 1 of the present embodiment further includes a clamp-type AC current sensor 49 in addition to any configuration of the power storage system 1 of the above embodiment.
The clamp type AC current sensor 49 is installed on the AC power line 28b between the distribution board 24 and the power system 22, and detects the direction of the current flowing through the AC power line 28b. The acquisition unit 102 acquires information regarding the direction of the current flowing through the AC power line 28b from the clamped AC current sensor 49.

And the control part 104 detects the reverse power flow to the electric power grid | system 22, based on the direction of the electric current which the acquisition part 102 acquired. Then, when a reverse power flow is detected, the power storage device 40 is charged with the surplus power generated by the PV panel 12 while performing follow-up control so that the reverse power flow does not occur.
In this case, the MPPT control performed in the above embodiment is not performed.

In this configuration, when the power output from the PV panel 12 is equal to or greater than the threshold, the power exceeding the threshold may be charged as a surplus. The threshold may be, for example, the total power consumption by the customer's load 26 or the like. According to this configuration, the clamp-type AC current sensor 49 is not necessary.

According to this configuration, the same effect as that of the above-described embodiment can be obtained, and even when the PV output suppression signal 32 is not received, the surplus power derived from the PV panel 12 can be supplied to the power storage device 40 without causing reverse flow. It can be charged and used effectively.

In addition, when acquiring and using information about a user in the present invention, this shall be done legally.

A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.
(Appendix 1)
Power storage means;
Control means for controlling charging and discharging of the power storage means;
With
The DC power generator is connected to the converter via a DC power line,
The conversion device connects the DC power line and the AC power line, and converts DC power into AC power,
The AC power line is connected to a power system, is connected to the DC power generation device via the conversion device,
The power storage means is connected to the DC power line between the DC power generator and the converter, and the control means
When it is detected that the output of the DC power generation device is being suppressed, the charging current of the power storage means is controlled so that the charging power of the power storage means or the output power of the DC power generation device is maximized. Power storage system.
(Appendix 2)
The power storage system according to appendix 1, wherein the control means periodically checks whether or not the output of the DC power generation device is continuing to be suppressed every predetermined time.
(Appendix 3)
The apparatus further comprises information acquisition means for acquiring information related to an instruction to suppress the output of the DC power generator from the converter.
The power storage system according to appendix 1 or 2, wherein the control unit determines whether or not the output of the DC power generation device is being suppressed based on information regarding the suppression instruction acquired by the information acquisition unit.
(Appendix 4)
Further comprising power information acquisition means for acquiring at least one of the direction and magnitude of the DC power input to the converter,
The control means includes
Based on a change in at least one of the direction and magnitude of the DC power acquired by the power information acquisition unit when the charge amount to the power storage unit is increased by a predetermined amount, the output of the DC power generation device is being suppressed. The power storage system according to any one of appendices 1 to 3, wherein the power storage system determines whether or not.
(Appendix 5)
The DC power generator is a photovoltaic power generation facility,
The power storage system according to any one of appendices 1 to 4, wherein the conversion device is a photovoltaic power conditioner.
(Appendix 6)
A charge / discharge control device connected to a power storage device,
The DC power generator is connected to the converter via a DC power line,
The conversion device connects the DC power line and the AC power line, and converts DC power into AC power,
The AC power line is connected to a power system, is connected to the DC power generation device via the conversion device,
Connected to the DC power line between the DC generator and the converter,
The charge / discharge control device comprises:
Control that controls the charging current of the power storage device so that the charging power of the power storage device or the output power of the DC power generation device is maximized when it is detected that the output of the DC power generation device is being suppressed. Charge / discharge control apparatus comprising means.
(Appendix 7)
The charge / discharge control device according to appendix 6, wherein the control means periodically checks whether or not the output of the DC power generation device is continuing to be suppressed every predetermined time.
(Appendix 8)
The apparatus further comprises information acquisition means for acquiring information related to an instruction to suppress the output of the DC power generator from the converter.
The charge / discharge control according to appendix 6 or 7, wherein the control unit determines whether or not the output of the DC power generation device is being suppressed based on information on the suppression instruction acquired by the information acquisition unit. apparatus.
(Appendix 9)
Further comprising power information acquisition means for acquiring at least one of the direction and magnitude of the DC power input to the converter,
The control means includes
Based on a change in at least one of the direction and magnitude of the DC power acquired by the power information acquisition means when the amount of charge to the power storage device is increased by a predetermined amount, the output of the DC power generation device is being suppressed. The charge / discharge control apparatus according to any one of appendices 6 to 8, which determines whether or not
(Appendix 10)
The DC power generator is a photovoltaic power generation facility,
The charge / discharge control device according to any one of appendices 6 to 9, wherein the conversion device is a photovoltaic power conditioner.
(Appendix 11)
A control method of a charge / discharge control device connected to a power storage device,
The DC power generator is connected to the converter via a DC power line,
The conversion device connects the DC power line and the AC power line, and converts DC power into AC power,
The AC power line is connected to a power system, is connected to the DC power generation device via the conversion device,
Connected to the DC power line between the DC generator and the converter,
The charge / discharge control device comprises:
When it is detected that the output of the DC power generation device is being suppressed, the charging current of the power storage device is controlled so that the charging power of the power storage device or the output power of the DC power generation device is maximized. Control method.
(Appendix 12)
The charge / discharge control device comprises:
The control method according to appendix 11, wherein the output of the DC power generation device is periodically checked at predetermined time intervals to determine whether or not the output of the DC power generation device is continuing to be suppressed.
(Appendix 13)
The charge / discharge control device comprises:
From the converter, obtain information on the instruction to suppress the output of the DC power generator,
The control method according to appendix 11 or 12, wherein it is determined whether or not the output of the DC power generation device is being suppressed based on the acquired information regarding the suppression instruction.
(Appendix 14)
The charge / discharge control device comprises:
Obtaining at least one of the direction and magnitude of the DC power input to the converter,
Whether or not the output of the DC power generation device is being suppressed based on a change in at least one of the direction and magnitude of the acquired DC power when the amount of charge to the power storage device is increased by a predetermined amount. The control method according to any one of appendices 11 to 13, which is determined.
(Appendix 15)
The DC power generator is a photovoltaic power generation facility,
The control method according to any one of appendices 11 to 14, wherein the conversion device is a photovoltaic power conditioner.
(Appendix 16)
A computer-readable recording medium recording a computer program for realizing a charge / discharge control device connected to a power storage device,
The DC power generator is connected to the converter via a DC power line,
The conversion device connects the DC power line and the AC power line, and converts DC power into AC power,
The AC power line is connected to a power system, is connected to the DC power generation device via the conversion device,
Connected to the DC power line between the DC generator and the converter,
On the computer,
A procedure for controlling the charging current of the power storage device so that the charging power of the power storage device or the output power of the DC power generation device is maximized when it is detected that the output of the DC power generation device is being suppressed. The computer-readable recording medium which recorded the program for performing this.
(Appendix 17)
In a computer-readable recording medium in which the program according to appendix 16 is recorded,
A computer-readable recording medium having recorded thereon a program for causing a computer to execute a procedure for periodically checking whether or not the output of the DC power generation device is continuing to be suppressed every predetermined time.
(Appendix 18)
In a computer-readable recording medium on which the program according to

appendix

16 or 17 is recorded,
A procedure for obtaining information relating to an instruction for suppressing the output of the DC power generator from the converter, and determining whether or not the output of the DC power generator is being suppressed based on the obtained information relating to the instruction for suppression. A computer-readable recording medium on which a program for causing a computer to execute a procedure is recorded.
(Appendix 19)
In a computer-readable recording medium on which the program according to any one of supplementary notes 16 to 18 is recorded,
A procedure for obtaining at least one of the direction and the magnitude of the DC power input to the converter;
Whether or not the output of the DC power generation device is being suppressed based on a change in at least one of the direction and magnitude of the acquired DC power when the amount of charge to the power storage device is increased by a predetermined amount. A computer-readable recording medium having recorded thereon a program for causing a computer to execute a determination procedure.
(Appendix 20)
In a computer-readable recording medium on which the program according to any one of supplementary notes 16 to 19 is recorded,
The DC power generator is a photovoltaic power generation facility,
The said converter is a computer-readable recording medium which recorded the program which is a photovoltaic power conditioner.
While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
This application claims priority based on Japanese Patent Application No. 2016-147671 filed on Jul. 26, 2016, the entire disclosure of which is incorporated herein.

DESCRIPTION OF SYMBOLS 1 Power storage system 10 PV system 12 PV panel 16 DC power line 16a 1st DC power line 16b 2nd DC power line 17 Connection line 22 Power system 24 Distribution board 26

Load

28, 28a, 28b AC power line 30 Server 32 PV output suppression signal 40 Power Storage Device 42 Battery System 44 Clamp Type DC Current Sensor 46 Clamp Type DC Current Sensor 48 Clamp Type DC Current Sensor 49 Clamp Type AC Current Sensor 50 Booster 80 Computer 82 CPU
84 Memory 85 Storage 86 I / O
87 Communication I / F
89 Bus 90 Computer program 100 Charge / discharge control device 102 Acquisition unit 104 Control unit 106 Information acquisition unit 110 Storage device 112 Current value information 113 Current value information 114 Difference information 115 Difference information

Claims

Power storage means;
Control means for controlling charging and discharging of the power storage means;
With
The DC power generator is connected to the converter via a DC power line,
The conversion device connects the DC power line and the AC power line, and converts DC power into AC power,
The AC power line is connected to a power system, is connected to the DC power generation device via the conversion device,
The power storage means is connected to the DC power line between the DC power generator and the converter, and the control means
When it is detected that the output of the DC power generation device is being suppressed, the charging current of the power storage means is controlled so that the charging power of the power storage means or the output power of the DC power generation device is maximized. Power storage system.
2. The power storage system according to claim 1, wherein the control unit periodically checks whether or not the output of the DC power generation device is continuing to be suppressed every predetermined time.
The apparatus further comprises information acquisition means for acquiring information related to an instruction to suppress the output of the DC power generator from the converter.
The power storage system according to claim 1 or 2, wherein the control unit determines whether or not the output of the DC power generation device is being suppressed based on information regarding the suppression instruction acquired by the information acquisition unit. .
Further comprising power information acquisition means for acquiring at least one of the direction and magnitude of the DC power input to the converter,
The control means includes
Based on a change in at least one of the direction and magnitude of the DC power acquired by the power information acquisition unit when the charge amount to the power storage unit is increased by a predetermined amount, the output of the DC power generation device is being suppressed. The power storage system according to any one of claims 1 to 3, wherein it is determined whether or not.
The DC power generator is a photovoltaic power generation facility,
The power storage system according to any one of claims 1 to 4, wherein the conversion device is a photovoltaic power conditioner.
A charge / discharge control device connected to a power storage device,
The DC power generator is connected to the converter via a DC power line,
The conversion device connects the DC power line and the AC power line, and converts DC power into AC power,
The AC power line is connected to a power system, is connected to the DC power generation device via the conversion device,
Connected to the DC power line between the DC generator and the converter,
The charge / discharge control device comprises:
Control that controls the charging current of the power storage device so that the charging power of the power storage device or the output power of the DC power generation device is maximized when it is detected that the output of the DC power generation device is being suppressed. Charge / discharge control apparatus comprising means.
The charge / discharge control device according to claim 6, wherein the control means periodically checks whether or not the output of the DC power generation device is continuing to be suppressed every predetermined time.
The apparatus further comprises information acquisition means for acquiring information related to an instruction to suppress the output of the DC power generator from the converter.
The charging / discharging according to claim 6 or 7, wherein the control unit determines whether or not the output of the DC power generation device is being suppressed based on information on the suppression instruction acquired by the information acquisition unit. Control device.
Further comprising power information acquisition means for acquiring at least one of the direction and magnitude of the DC power input to the converter,
The control means includes
Based on a change in at least one of the direction and magnitude of the DC power acquired by the power information acquisition means when the amount of charge to the power storage device is increased by a predetermined amount, the output of the DC power generation device is being suppressed. The charge / discharge control apparatus according to any one of claims 6 to 8, wherein it is determined whether or not.
The DC power generator is a photovoltaic power generation facility,
The charge / discharge control device according to any one of claims 6 to 9, wherein the conversion device is a photovoltaic power conditioner.
A control method of a charge / discharge control device connected to a power storage device,
The DC power generator is connected to the converter via a DC power line,
The conversion device connects the DC power line and the AC power line, and converts DC power into AC power,
The AC power line is connected to a power system, is connected to the DC power generation device via the conversion device,
Connected to the DC power line between the DC generator and the converter,
The charge / discharge control device comprises:
When it is detected that the output of the DC power generation device is being suppressed, the charging current of the power storage device is controlled so that the charging power of the power storage device or the output power of the DC power generation device is maximized. Control method.
The charge / discharge control device comprises:
The control method according to claim 11, wherein whether or not the output of the DC power generation device is being continuously suppressed is periodically checked at predetermined time intervals.
The charge / discharge control device comprises:
From the converter, obtain information on the instruction to suppress the output of the DC power generator,
The control method according to claim 11 or 12, wherein it is determined whether or not the output of the DC power generation device is being suppressed based on the acquired information regarding the suppression instruction.
The charge / discharge control device comprises:
Obtaining at least one of the direction and magnitude of the DC power input to the converter,
Whether or not the output of the DC power generation device is being suppressed based on a change in at least one of the direction and magnitude of the acquired DC power when the amount of charge to the power storage device is increased by a predetermined amount. The control method according to claim 11, wherein the determination is performed.
The DC power generator is a photovoltaic power generation facility,
The control method according to any one of claims 11 to 14, wherein the conversion device is a photovoltaic power conditioner.
A computer-readable recording medium recording a computer program for realizing a charge / discharge control device connected to a power storage device,
The DC power generator is connected to the converter via a DC power line,
The conversion device connects the DC power line and the AC power line, and converts DC power into AC power,
The AC power line is connected to a power system, is connected to the DC power generation device via the conversion device,
Connected to the DC power line between the DC generator and the converter,
On the computer,
A procedure for controlling the charging current of the power storage device so that the charging power of the power storage device or the output power of the DC power generation device is maximized when it is detected that the output of the DC power generation device is being suppressed. The computer-readable recording medium which recorded the program for performing this.
A computer-readable recording medium in which the program according to claim 16 is recorded.
A computer-readable recording medium having recorded thereon a program for causing a computer to execute a procedure for periodically checking whether or not the output of the DC power generation device is continuing to be suppressed every predetermined time.
A computer-readable recording medium on which the program according to claim 16 or 17 is recorded,
A procedure for obtaining information relating to an instruction for suppressing the output of the DC power generator from the converter, and determining whether or not the output of the DC power generator is being suppressed based on the obtained information relating to the instruction for suppression. A computer-readable recording medium on which a program for causing a computer to execute a procedure is recorded.
A computer-readable recording medium recording the program according to any one of claims 16 to 18,
A procedure for obtaining at least one of the direction and the magnitude of the DC power input to the converter;
Whether or not the output of the DC power generation device is being suppressed based on a change in at least one of the direction and magnitude of the acquired DC power when the amount of charge to the power storage device is increased by a predetermined amount. A computer-readable recording medium having recorded thereon a program for causing a computer to execute a determination procedure.
A computer-readable recording medium in which the program according to any one of claims 16 to 19 is recorded.
The DC power generator is a photovoltaic power generation facility,
The said converter is a computer-readable recording medium which recorded the program which is a photovoltaic power conditioner.