JP2019198138A - Power storage device - Google Patents

Abstract

To provide a power storage device which can be easily attached to a house where a power generator is installed.SOLUTION: A power storage device 10 comprises: a power storage mechanism 12 for charging power generated from natural energy by a power generator (2); a wiring mechanism 11 for forming a first electric circuit EL1 from the power generator to a power converter 3, a second electric circuit EL2 from the power generator to the power storage mechanism 12, and a third electric circuit EL3 from the power storage mechanism 12 to the power converter 3 by installing the mechanism in the middle of power lines (71, 72, 73 and 74) from the power generator to the power converter 3; and control sections (13 and 40) for controlling switching of the first electric circuit EL1, the second electric circuit EL2 and the third electric circuit EL3 in the wiring mechanism 11.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power storage device that charges power from a power generation device in a building.

  In recent years, it has been known that a power generation device that uses natural energy to generate electric power is installed in a building such as a house, and the electric power from the building is used in the building or sold to an electric power company or the like (power sale). ing.

  In a building provided with such a power generation device, it is considered to provide a storage battery in order to charge electric power or the like created by the power generation device (for example, see Patent Document 1). The storage battery is appropriately charged with electric power from the power generation device, and can be used in any scene of the charged electric power. For this reason, in the building provided with the power generation device and the storage battery, the degree of freedom and convenience of using the electric power created by the power generation device can be enhanced.

Noto 3153038

  Here, in a house or the like provided with a power generation device, a power conditioner (hereinafter also referred to as a power conditioner) is connected to the power generation apparatus, and the stable use and sale of power generated by the power generation apparatus through the power conditioner. Is possible. By the way, in order to enable the use of power from a power storage device while enabling the use of power from a power generation device or a commercial power system, it is necessary to use a power conditioner that is configured for their operation. is there. For this reason, in a house or the like provided with a power generation device, when a power storage device is newly provided, it is necessary to replace the power conditioner with a corresponding one, and the power storage device cannot be easily provided.

  The present invention has been made in view of the above circumstances, and provides a power storage device that can be easily attached to a house or the like provided with a power generation device.

  The power storage device according to claim 1 is interposed between the power storage mechanism that charges the power generated by the power generation device from natural energy and the power line from the power generation device to the power control, so that the power generation device is connected to the power control. A first electrical circuit, a wiring mechanism that forms a second electrical circuit from the power generation device to the power storage mechanism, and a third electrical circuit from the power storage mechanism to the power converter, and the first electrical circuit and the second electrical circuit in the wiring mechanism And a control unit that controls switching between the third electric circuit and the third electric circuit.

  The power storage device of the present invention can be easily attached to a house or the like provided with a power generation device.

It is explanatory drawing which shows the existing photovoltaic power generation system with which the electrical storage apparatus of Example 1 which concerns on one Embodiment of the electrical storage apparatus of this invention is attached. It is explanatory drawing which shows an electrical storage apparatus. It is explanatory drawing which shows a mode that the 1st power line and 2nd power line of the solar power generation system were cut | disconnected for attachment of an electrical storage apparatus. It is explanatory drawing which shows a mode that the electrical storage apparatus was attached to the solar energy power generation system, and the 2nd electrical circuit was formed. It is explanatory drawing which shows a mode that the 1st electrical circuit was formed with the electrical storage apparatus. It is explanatory drawing which shows a mode that the 3rd electrical circuit was formed with the electrical storage apparatus.

  Embodiments of a power storage device according to the present invention will be described below with reference to the drawings.

  A schematic configuration of a power storage device 10 as an embodiment of a power storage device according to the present invention will be described with reference to FIGS. 1 to 6. 3 to 6 partially enlarge the periphery of the photovoltaic power generation system 1 of FIG. 1 where the power storage device 10 is provided.

  First, an existing solar power generation system 1 that is a target to which a power storage device 10 is newly attached will be described with reference to FIG. The solar power generation system 1 is an example of a power generation system configured by providing a building with a power generation device that generates electric power from natural energy, and generates electric power using energy from the sun. The solar power generation system 1 includes a solar panel 2, a power conditioner 3 (hereinafter referred to as a power conditioner 3), a distribution board 4, a load 5, and a wattmeter 6. The solar power generation system 1 (solar panel 2 as a power generation device) may be one that uses wind power, one that uses geothermal heat, one that uses tidal power, as long as it generates power from natural energy. Any other force may be used, and is not limited to the configuration of the first embodiment.

  The solar panel 2 constitutes a power generation device in the solar power generation system 1, and a plurality of solar cells (cells), which are power devices that directly convert light energy into electric power, are connected in a panel form while arranging a plurality of solar cells. It is configured. The solar panel 2 includes a plurality of strings S. Each string S is configured by connecting a plurality of solar cells (cells) in series, and can generate power in units of the strings S. The solar panel 2 according to the first embodiment includes four strings S having the same size (power generation area). When individually described, the nth (n is a natural number from 1 to 4) is added to the beginning of the word. In addition, n is added to the end of the symbol S. In the solar panel 2, the number of strings S and the size (power generation area) of each string S may be set as appropriate, and the configuration is not limited to that of the first embodiment. Further, the solar panel 2 may have a function of converting sunlight thermal energy into electric power, and is not limited to the configuration of the first embodiment.

  The solar panel 2 is provided with a power line 7 for each string S, and each is connected to the power conditioner 3. In the following, when the power lines 7 are individually described, the power line 7 is indicated by adding the nth (n is a natural number from 1 to 4) to the beginning of the word, and adding n to the end of the reference numeral 7. For this reason, the solar panel 2 can generate electric power for each string S and output it to the power conditioner 3.

  The power conditioner 3 is a power conditioner for solar power generation, and converts the DC power generated by the solar panel 2 into AC power. The power conditioner 3 outputs the converted AC power to the distribution board 4. In the power conditioner 3 of the first embodiment, the first power line 71 from the first string S1 and the second power line 72 from the second string S2 are joined together and then boosted. In addition, the power conditioner 3 is configured to boost the voltage after the third power line 73 from the third string S3 and the fourth power line 74 from the fourth string S4 are joined together. That is, the power conditioner 3 treats the first power line 71 (first string S1) and the second power line 72 (second string S2) as a set, and the third power line 73 (third string S3) and the fourth power line 74. (Fourth string S4) is treated as one set. And the power conditioner 3 uses the electric power created by the solar panel 2 in the load 5 by converting the electric power inputted from each power line 7 (71 to 74) from DC electric power to AC electric power as appropriate. It is possible to sell electricity.

  The distribution board 4 is connected to the load 5 and the wattmeter 6 and enables supply of power from the commercial power system E or power from the solar panel 2 to the load 5. The load 5 is a plurality of electrical products provided in the building, and power can be supplied from the distribution board 4 through outlets connected to the distribution board 4. In the first embodiment, the distribution board 4 is provided with a CT (Current Transformer) sensor so that the amount of electric power required by the load 5 can be acquired, and the acquired information can be output to the controller 13 described later. It is said that.

  The wattmeter 6 is connected between the distribution board 4 and the commercial power system E. The wattmeter 6 measures the amount of power input from the commercial power system E and the amount of power input from the solar panel 2 via the power conditioner 3. That is, the wattmeter 6 measures the amount of electricity used (amount of electricity purchased) from the commercial power system E, the amount of electricity sold from the solar panel 2, and the like.

  The solar power generation system 1 can operate the load 5 with power from the commercial power system E and can operate the load 5 with power generated by the solar panel 2. Moreover, the solar power generation system 1 can sell the electric power created by the solar panel 2 to the commercial power system E via the power conditioner 3 and the wattmeter 6. In Example 1, the power storage device 10 is attached between the first power line 71 and the second power line 72 in the solar power generation system 1 (a portion surrounded by a two-dot chain line in FIG. 1).

  The power storage device 10 is attached to the solar power generation system 1 to appropriately charge the power generated by the solar panel 2, and the charged power can be generated for an arbitrary time (for example, a time during which the solar panel 2 cannot generate power). ) Can be used. In particular, the power storage device 10 according to the first embodiment can charge the power generated by the first string S1 of the four strings S, and the other three strings S (S2 to S4) are the same as the conventional one. Is possible.

  As shown in FIG. 2, the power storage device 10 includes a wiring mechanism 11, a power storage mechanism 12, a controller 13, and a display operation unit 14. The wiring mechanism 11 is provided on the power line 7 of the photovoltaic power generation system 1, forms a branch circuit from the power line 7 to the power storage mechanism 12, and provides an electric path between the solar panel 2, the power conditioner 3, and the power storage mechanism 12. Form to be switchable. The power storage mechanism 12 appropriately charges the electric power created by the solar panel 2 and discharges the electric power as appropriate so that it can be used. The controller 13 controls the charging and discharging operations in the power storage mechanism 12 by controlling the switching of the electric circuit in the wiring mechanism 11 and the like.

  The wiring mechanism 11 is configured by housing an electric circuit in a housing 21. The casing 21 is provided with a first input unit 22, a first output unit 23, a second input unit 24, a second output unit 25, and a charging connection unit 26 that serve as input / output terminals to the outside of the electric circuit to be accommodated. ing.

  The first input unit 22 is connected to the power generation device side of the power line connected to the string used for charging among the plurality of strings in the power generation device to be attached (solar panel 2 in the first embodiment). In the first embodiment, the first power line 71 extending from the first string S1 to be charged is cut in the middle, and the cut end of the first power line 71 on the side connected to the first string S1 in the first power line 71 is cut. Is connected to the first input unit 22 (see FIG. 3 and the like). For this reason, the 1st input part 22 serves as an input part to the wiring mechanism 11 of the electric power which the 1st string S1 made into the object of charge created.

  The first output unit 23 is connected to the power conditioner 3 side of the power line connected to the first input unit 22. In the first embodiment, the cut end of the first power line 71 on the side connected to the power conditioner 3 in the first power line 71 cut in the middle is connected to the first output unit 23 (see FIG. 3 and the like). For this reason, the 1st output part 23 turns into an output part to the power conditioner 3 of the electric power which 1st string S1 made into the object of charge created.

  The second input unit 24 is connected to the power generation device side of the power line connected to the string used for charging and the set of strings in the power conditioner 3. In the first embodiment, in the power conditioner 3, the first power line 71 to be charged and the second power line 72 paired with the first power line 71 are disconnected in the middle, and the second power line 72 is disconnected on the side connected to the second string S2. The end portion thus connected is connected to the second input unit 24 (see FIG. 3 and the like). For this reason, the second input unit 24 is an input unit to the power wiring mechanism 11 created by the second string S2 that is handled as a pair with the second string S2 in the power conditioner 3.

  The second output unit 25 is connected to the power controller 3 side of the power line connected to the second input unit 24. In the first embodiment, the cut end portion of the second power line 72 connected to the power conditioner 3 in the second power line 72 cut in the middle is connected to the second output unit 25 (see FIG. 3 and the like). For this reason, the 2nd output part 25 serves as an output part to the power conditioner 3 of the electric power which the 2nd string S2 made into a pair in the 1st string S1 and power conditioner 3 made into the object of charge creates.

  The charge connection unit 26 is connected to the power storage mechanism 12. The charging connection portion 26 of the first embodiment is connected to a connection line 27 connected to the power storage mechanism 12. For this reason, the charging connection unit 26 serves as an output unit for electric power for charging the charging connection unit 26 and also serves as an input unit for electric power discharged from the charging connection unit 26.

  In the wiring mechanism 11, the first electric wire 31 extending from the first input unit 22, the changeover switch 32 provided at the end of the first electric wire 31, the changeover switch 32, the first output unit 23, and the like in the housing 21. , A third electric wire 34 connecting the changeover switch 32 and the charging connection portion 26, and a fourth electric wire 35 connecting the second input portion 24 and the second output portion 25. . The changeover switch 32 includes a first switch part 32a, a second switch part 32b, a first path 32c that connects both the switch parts 32a and 32b, and a second path 32d that connects the first switch part 32a and the second electric wire 33. And having.

  The first switch part 32a includes a terminal 32e provided on the first electric wire 31, a terminal 32f provided on an end of the first path 32c on the first switch part 32a side, and a first switch part of the second path 32d. It has a terminal 32g provided at the end on the 32a side and a connector 32h extending from the terminal 32e. The first switch part 32a has a state in which the terminals 32e and 32f are connected by a connector 32h to connect the first electric wire 31 and the first path 32c, and the terminals 32e and 32g are connected by a connector 32h. It is possible to switch between a state (see FIG. 5) where 31 and the second path 32d are connected.

  The second switch portion 32b includes a terminal 32i provided at an end portion of the first path 32c on the second switch portion 32b side, a terminal 32j provided at an end portion of the second electric wire 33, and an end of the third electric wire 34. Terminal 32k provided in the section, and a connector 32m extending from the terminal 32k. The second switch portion 32b has a state in which the terminals 32i and 32k are connected by the connector 32m and the first path 32c and the third electric wire 34 are connected, and the terminals 32j and 32k are connected by the connector 32m and the second electric wire is connected. It is possible to switch between a state (see FIG. 6) in which 33 and the third electric wire 34 are connected.

  Under the control of the drive controller 40, which will be described later, the changeover switch 32 is interlocked with the first switch portion 32a and the second switch portion 32b, so that the terminal 32e (first electric wire 31) and the terminal 32j (second electric wire 33) The connection state with the terminal 32k (third electric wire 34) is switched. The changeover switch 32 is configured to connect the terminal 32i and the terminal 32k of the second switch part 32b (see FIG. 4) while connecting the terminal 32e and the terminal 32f of the first switch part 32a. The first electric wire 31 and the third electric wire 34 are brought into conduction through 32a, 32b and the first path 32c. At this time, since the terminal 32g of the first switch portion 32a is opened, it is possible to prevent current from flowing from the second electric wire 33 to the second path 32d.

  The changeover switch 32 is connected to the terminal 32i and the terminal 32k of the second switch part 32b while connecting the terminal 32e and the terminal 32g of the first switch part 32a (see FIG. 5). The first electric wire 31 and the second electric wire 33 are made conductive through the 1 switch portion 32a and the second path 32d. At this time, since the terminal 32f of the first switch portion 32a is opened, it is possible to prevent current from flowing from the third electric wire 34 to the first path 32c via the second switch portion 32b. Further, since the terminal 32j of the second switch portion 32b is opened, it is possible to prevent current from flowing from the third electric wire 34 to the second switch portion 32b.

  Furthermore, the changeover switch 32 is connected to the terminal 32j and the terminal 32k of the second switch part 32b while connecting the terminal 32e and the terminal 32f of the first switch part 32a (see FIG. 6). The 2nd electric wire 33 and the 3rd electric wire 34 are made to conduct | electrically_connect through 2 switch part 32b. At this time, since the terminal 32g of the first switch portion 32a is opened, it is possible to prevent current from flowing from the second electric wire 33 to the second path 32d. Further, since the terminal 32i of the second switch portion 32b is open, it is possible to prevent current from flowing from the first electric wire 31 to the first path 32c via the first switch portion 32a.

  In the first electric wire 31, a backflow prevention diode 36 and a voltage measurement unit 37 are provided between the first input unit 22 and the terminal 32 e (changeover switch 32). The backflow prevention diode 36 prevents current from flowing from the terminal 32 e (changeover switch 32) to the first input unit 22 in the first electric wire 31. The voltage measurement part 37 measures the voltage of the 1st electric wire 31, and outputs the voltage information which shows a measurement result (voltage of the 1st electric wire 31) to the drive controller 40 mentioned later.

  In the third electric wire 34, a DC / DC converter 38 is provided between the terminal 32 k (changeover switch 32) and the charging connection unit 26. The DC / DC converter 38 steps up or steps down the DC power input through the first input unit 22 or the DC power input through the charging connection unit 26, and outputs the boosted or stepped down DC power. . The DC / DC converter 38 makes it possible to charge or discharge from the power storage mechanism 12 by increasing or decreasing the DC power. The DC / DC converter 38 may perform MPPT (Maximum Power Point Tracking) control for maximizing the output from the first string S1. Since this MPPT control is publicly known, detailed description thereof is omitted.

  In the fourth electric wire 35, a backflow prevention diode 39 is provided. The backflow prevention diode 39 prevents current from flowing from the second output unit 25 to the second input unit 24 in the fourth electric wire 35 and functions as a backflow prevention unit.

  In the wiring mechanism 11, a drive controller 40 is provided in the housing 21. The drive controller 40 controls the operation of the changeover switch 32 and the DC / DC converter 38 based on voltage information from the voltage measurement unit 37 and battery information from the BMS 42 described later of the power storage mechanism 12. Under the control, the drive controller 40 causes the power storage mechanism 12 (a storage battery body 41 described later) to charge the power from the first string S1 connected to the first input unit 22, or the power from the first string S1. The power is sent to the power conditioner 3, or the power charged in the power storage mechanism 12 is sent to the power conditioner 3.

  The power storage mechanism 12 includes a storage battery main body 41 and a BMS (Battery Management System) 42. The storage battery body 41 is capable of storing electric power (charging) and discharging the stored electric power (discharging). The BMS 42 performs control for preventing overdischarge and overcharge in the storage battery main body 41, acquires battery information such as the charge amount and temperature of the storage battery main body 41, and outputs the battery information to the drive controller 40. .

  The control controller 13 is formed by a computer storing a program, and is wirelessly connected to the distribution board 4 (its CT sensor), the wiring mechanism 11 (its drive controller 40), the power storage mechanism 12 (its BMS 42), the display operation unit 14, or the like. It is possible to communicate by wire. The control controller 13 controls the drive controller 40 based on the program stored in the internal memory 13a, that is, controls the operation of the changeover switch 32 and the DC / DC converter 38 of the wiring mechanism 11 via the drive controller 40. It is possible to do. The controller 13 receives battery information from the BMS 42, voltage information from the voltage measurement unit 37, and acquisition information from the distribution board 4 (CT sensor). And the controller 13 controls the drive controller 40 suitably based on these information. For this reason, the controller 13 can perform an operation different from normal in the charge / discharge operation of the power storage mechanism 12 by the drive controller 40.

  Further, the controller 13 controls the amount of discharge of the power storage mechanism 12 based on the acquired information from the distribution board 4 when the power storage mechanism 12 is being discharged. That is, the controller 13 sends a signal for controlling the operation of the DC / DC converter 38 so that the amount of discharge matches the amount of power required by the load 5 from the distribution board 4 based on the acquired information. Output to. Thereby, the electric power charged in the electrical storage mechanism 12 (the storage battery main body 41) can be used efficiently. This is because if such control is not performed, power is discharged from the power storage mechanism 12 at the maximum discharge amount, and thus the power storage mechanism 12 becomes the discharge lower limit value in a short time. The controller 13 functions as a control unit that controls switching of the first electric circuit EL1, the second electric circuit EL2, and the third electric circuit EL3 in cooperation with the drive controller 40, as will be described later.

  The display operation unit 14 is formed by a computer storing a program, and is formed by a smartphone in this embodiment. The display operation unit 14 displays the operation status of the power storage device 10, the power generation amount of the solar panel 2, the charge amount of the power storage mechanism 12, and the like under the control of the controller 13. The display operation unit 14 also functions as an operation unit of the power storage device 10 using a function of a touch panel by appropriately displaying an icon or the like for operating the power storage device 10. The display operation unit 14 can perform an operation switching operation such as using the power charged in the power storage mechanism 12 with the load 5 or selling the power. The display operation unit 14 may be configured in combination with the controller 13, may be configured separately from the display unit and the operation unit, or the combination of one of the display unit and the operation unit and the control controller 13. However, the present invention is not limited to the configuration of the first embodiment. In addition, the display operation unit 14 enables switching operation of using power from the solar panel 2 with the load 5, selling the power, or charging the power storage mechanism 12 with the power. Also good.

  Next, attachment of the power storage device 10 to the solar power generation system 1 will be described. In the first embodiment, in the photovoltaic power generation system 1, the first string S <b> 1 among the four strings S of the solar panel 2 is a charging target.

  First, as shown in FIG. 3, in the photovoltaic power generation system 1, the first power line 71 from the first string S <b> 1 to be charged is cut in the middle, and the connection terminals 43 are attached to the cut ends. Further, in the power conditioner 3, the second power line 72 from the second string S2 paired with the first string S1 is cut in the middle, and the connection terminals 43 are also attached to the cut ends. Each connection terminal 43 can be connected to the first input unit 22, the first output unit 23, the second input unit 24, and the second output unit 25.

  Then, as shown in FIG. 4, the connection terminal 43 of the first power line 71 on the side connected to the first string S <b> 1 (solar panel 2) is connected to the first input unit 22 of the casing 21 of the wiring mechanism 11. At the same time, the connection terminal 43 of the first power line 71 on the side connected to the power conditioner 3 is connected to the first output unit 23 of the housing 21. Thereby, the wiring mechanism 11 is interposed in the middle of the first power line 71 from the first string S1 of the solar panel 2. In addition, the power storage mechanism 12 is connected to the charging connection portion 26 of the housing 21 via a connection line 27.

  Further, the connection terminal 43 of the second power line 72 on the side connected to the second string S2 (solar panel 2) is connected to the second input part 24 of the housing 21 of the wiring mechanism 11 and connected to the power conditioner 3. The connection terminal 43 of the second power line 72 on the other side is connected to the second output unit 25 of the housing 21. Thereby, the wiring mechanism 11 is interposed in the middle of the second power line 72 from the second string S2 of the solar panel 2. Then, the second string S2 is connected to the power conditioner 3 through the second power line 72, the connection terminal 43, the second input unit 24, the fourth electric wire 35, the second output unit 25, the connection terminal 43, and the second power line 72. Is done. For this reason, the 2nd input part 24, the 4th electric wire 35, and the 2nd output part 25 serve as the 4th electric circuit EL4 from the 2nd string S2 (solar panel 2) to the power conditioner 3.

  Thereby, the power storage device 10 is attached to the solar power generation system 1. Thus, the power storage device 10 can be easily attached to the solar power generation system 1. Next, the operation of the power storage device 10 will be described. In the power storage device 10 of the first embodiment, the power from the solar panel 2 is basically charged by the power storage mechanism 12, and when the power storage mechanism 12 is fully charged (allowable maximum value), the power from the solar panel 2 is charged. Is set to sell power.

  When the voltage of the first electric wire 31 exceeds a predetermined value (minimum chargeable value) according to the voltage information and the charge amount of the storage battery main body 41 does not reach the allowable maximum value according to the battery information, the drive controller 40 While making the 1st electric wire 31 and the 3rd electric wire 34 conduct, the DC / DC converter 38 is set as the operation | movement of charge of the storage battery main body 41. FIG. Then, the first string S1 includes the first power line 71, the connection terminal 43, the first input unit 22, the first electric wire 31, the first switch unit 32a, the first path 32c, the second switch unit 32b, the third electric wire 34, It is connected to the power storage mechanism 12 via the charging connection part 26 and the connection line 27. Thereby, the 1st input part 22, the 1st electric wire 31, the 1st switch part 32a, the 1st path 32c, the 2nd switch part 32b, the 3rd electric wire 34, and the charge connection part 26 are the 1st string S1 (solar panel 2 ) To the power storage mechanism 12. Thereby, the electric power created by the first string S1 (solar panel 2) is charged to the power storage mechanism 12 (the storage battery body 41) through the wiring mechanism 11. Note that the charging of the electric power from the solar panel 2 in the power storage mechanism 12 may be set in advance such as setting in a time zone, and is not limited to the configuration of the first embodiment.

  At this time, the second string S <b> 2 is connected to the power conditioner 3 by forming the fourth electric circuit EL <b> 4 in the wiring mechanism 11. In the power conditioner 3, the side connected to the power conditioner 3 of the first power line 71 connected to the first string S <b> 1 paired with the second string S <b> 2 is connected via the connection terminal 43, the first output unit 23, and the second electric wire 33. Since the terminal 32j of the changeover switch 32 connected in this manner is open, current is prevented from flowing from the second electric wire 33 to the second switch portion 32b. For this reason, the electric power created by the second string S <b> 2 is output to the power conditioner 3 without flowing backward from the first power line 71 to the wiring mechanism 11. That is, the electric power created by the second string S2 is output to the power conditioner 3 as before the power storage device 10 is attached, and is used appropriately by the load 5, except that the electric power created by the first string S1 is not merged. At the same time, the power is appropriately sold to the commercial power system E via the wattmeter 6. In addition, the third string S3 and the fourth string S4 have no change from before the power storage device 10 is attached, so that the generated power is output to the power conditioner 3 and used appropriately by the load 5, and the wattmeter 6 After that, the power is appropriately sold to the commercial power system E.

  Further, the drive controller 40 performs the above-described charging, and when the amount of charge of the storage battery main body 41 reaches an allowable maximum value according to the battery information, as shown in FIG. The electric wire 33 is brought into conduction, and the charging operation of the storage battery main body 41 of the DC / DC converter 38 is stopped. Then, the first string S1 includes the first power line 71, the connection terminal 43, the first input unit 22, the first electric wire 31, the first switch unit 32a, the second path 32d, the second electric wire 33, the first output unit 23, It is connected to the power conditioner 3 via the connection terminal 43 and the first power line 71. For this reason, the 1st input part 22, the 1st electric wire 31, the 1st switch part 32a, the 2nd path 32d, the 2nd electric wire 33, and the 1st output part 23 are the 1st electric circuit EL1 from the 1st string S1 to the power conditioner 3 It becomes. Thereby, the electric power created by the first string S <b> 1 is output to the power conditioner 3 through the wiring mechanism 11. This state is the same as that before attaching the power storage device 10 except that the wiring mechanism 11 is passed. For this reason, the electric power created by the first string S1 is sold to the commercial power system E via the wattmeter 6 together with the electric power created by other strings (S2 to S4). Note that the power generated by the first string S1 may be used as appropriate by the load 5 together with the power generated by other strings (S2 to S4). In this case, the use or power sale of the power created by the first string S <b> 1 can be appropriately switched between use and power sale by enabling setting by operation on the display operation unit 14.

  Further, when the drive controller 40 is in a state unsuitable for charging while the power storage mechanism 12 is being charged with the electric power from the first string S <b> 1, the changeover switch 32 causes the first electric wire 31 and the second electric wire 33 to conduct. At the same time, the charging operation of the power storage mechanism 12 is stopped for the DC / DC converter 38, and the first electric circuit EL <b> 1 is formed by the wiring mechanism 11. The state that is not suitable for this charging is that the power storage mechanism 12 (storage battery body 41) is charged when the voltage of the first electric wire 31 falls below a predetermined value based on the voltage information or the temperature or voltage value exceeds the allowable value based on the battery information from the BMS 42. Judgment is made if the battery information is not suitable for the battery or the battery information cannot be acquired. As a result, the power generated by each string (S1 to S4) can be sold to the commercial power system E via the wattmeter 6 while protecting the power storage mechanism 12. At this time, as in the case described above, the load 5 may be used as appropriate.

  Next, it is assumed that in a scene where the solar panel 2 is not generating power, it is selected to use the power charged in the power storage mechanism 12 by the operation on the display operation unit 14. Then, as shown in FIG. 6, the drive controller 40 indicates that the voltage of the first electric wire 31 falls below a predetermined value based on the voltage information, and the charge amount of the power storage mechanism 12 (storage battery body 41) reaches the allowable minimum value based on the battery information. If not, the changeover switch 32 causes the second electric wire 33 and the third electric wire 34 to conduct, and the DC / DC converter 38 is operated to discharge the power storage mechanism 12. Then, the power storage mechanism 12 is connected via the connection line 27, the charging connection unit 26, the third electric wire 34, the second switch unit 32b, the second electric wire 33, the first output unit 23, the connection terminal 43, and the first power line 71. Connected to PowerCon 3. For this reason, the charging connection part 26, the 3rd electric wire 34, the 2nd switch part 32b, the 2nd electric wire 33, and the 1st output part 23 become the 3rd electric circuit EL3 from the electrical storage mechanism 12 to the power conditioner 3.

  Here, since the solar panel 2 is not generating power, the second string S2 is not generating power as well as the first string S1. Then, in the power conditioner 3, the first string S <b> 1 and the second string S <b> 2 are set as one set. Therefore, when power is sent from the power storage mechanism 12 via the first power line 71, the wiring mechanism 11 is connected from the second power line 72. Current may flow back to the second string S2 through the fourth electric circuit EL4. However, since the wiring mechanism 11 is provided with the backflow prevention diode 39 on the fourth electric wire 35 in the fourth electric circuit EL4, it is possible to prevent the backflow of current from the power storage mechanism 12 to the second string S2. As a result, it is possible to prevent the second string S2 from having any trouble due to the backflow. The power conditioner 3 converts the power sent from the power storage mechanism 12 for use in the load 5 or for selling power to the commercial power system E, similarly to the case where power is sent from the first string S1. . Thereby, the electric power charged in the power storage mechanism 12 can be appropriately used by the load 5 and can be appropriately sold to the commercial power system E via the wattmeter 6. The use or power sale of the power charged in the power storage mechanism 12 may be set in advance such as setting in a time zone, and is not limited to the configuration of the first embodiment.

  Next, the power from the commercial power system E is set not to be used (used when the following operation is insufficient), and the charge amount of the power storage mechanism 12 is sufficient (the charge amount exceeds the allowable minimum value). ) And an example of the operation in a scene where the amount of power generated from the solar panel 2 changes will be described. In this example, it is assumed that the amount of power generation increases in the morning and with time. In this case, if the voltage of the 1st electric wire 31 falls below predetermined value by voltage information, the drive controller 40 will judge that the solar panel 2 is not generating electric power (including the case where electric power generation amount is small). Then, since the charge amount of the electrical storage mechanism 12 (storage battery body 41) does not reach the allowable minimum value according to the battery information, the drive controller 40 causes the second electric wire 33 and the third electric wire 34 to conduct in the changeover switch 32 and the DC. The DC converter 38 is set to discharge the power storage mechanism 12. As a result, the third electric circuit EL3 (see FIG. 6) is formed in the wiring mechanism 11, the electric power charged in the power storage mechanism 12 is output to the power conditioner 3, and is used as appropriate by the load 5, and is commercialized via the wattmeter 6. Electric power is appropriately sold to the electric power system E.

  After that, it is assumed that the sun rises and a sufficient amount of power is generated from the solar panel 2. Then, since the voltage of the 1st electric wire 31 exceeds predetermined value by voltage information, the drive controller 40 judges whether it is set to charge. In the case of setting to charge, the drive controller 40 switches the first electric wire 31 and the third electric wire 34 at the changeover switch 32 when the charge amount of the power storage mechanism 12 (storage battery body 41) does not reach the allowable maximum value according to the battery information. The DC / DC converter 38 is turned on and the storage battery body 41 is charged. As a result, the second electric circuit EL2 (see FIG. 4) is formed in the wiring mechanism 11, and the power generated by the first string S1 is charged to the power storage mechanism 12 (its storage battery body 41) via the wiring mechanism 11. In the case of setting not to charge, the drive controller 40 causes the first electric wire 31 and the second electric wire 33 to conduct in the changeover switch 32 and stops the operation of charging the storage battery main body 41 of the DC / DC converter 38. As a result, the first electric circuit EL1 (see FIG. 5) is formed in the wiring mechanism 11, and the electric power generated by the first string S1 is output to the power conditioner 3 through the wiring mechanism 11 and used appropriately in the load 5. Then, the electricity is appropriately sold to the commercial power system E through the wattmeter 6.

  As described above, when the wiring mechanism 11 is interposed in the middle of the power line (71 to 74) from the solar panel 2 to the power conditioner 3, the power storage device 10 includes the first electric circuit EL1, the second electric circuit EL2, and the second electric circuit in the wiring mechanism 11. The three electric paths EL3 are switched by the controller 13 and the drive controller 40. Then, in the photovoltaic power generation system 1, when the power storage device 10 charges the power storage mechanism 12, the second power path EL <b> 2 from the solar panel 2 to the power storage mechanism 12 is formed in the wiring mechanism 11, so that the power storage device 10 is attached. It becomes the same as the state where the solar panel 2 before being generated is not generating power. In the solar power generation system 1, when the power storage device 10 does not charge the power storage mechanism 12, the power storage device 10 is attached by forming the first electric circuit EL <b> 1 from the solar panel 2 to the power conditioner 3 in the wiring mechanism 11. This is the same as the state in which the previous solar panel 2 is generating power. Furthermore, in the solar power generation system 1, when the power storage device 10 discharges the power storage mechanism 12, the power storage device 10 is attached by forming the third electric path EL <b> 3 from the power storage mechanism 12 to the power conditioner 3 in the wiring mechanism 11. This is the same as the state in which the previous solar panel 2 is generating power.

  As described above, in the photovoltaic power generation system 1, it is possible to use electric power appropriately with the load 5 by operating according to the presence or absence of power transmission to the power conditioner 3 regardless of whether or not the power storage device 10 is attached. The power can be sold as appropriate to the commercial power system E. Therefore, the power storage device 10 can change each component of the photovoltaic power generation system 1 including the power conditioner 3 only by interposing the wiring mechanism 11 in the middle of the power lines (71 to 74) from the solar panel 2 to the power conditioner 3. Without inviting, the power from the solar panel 2 can be appropriately charged and discharged for use.

  In particular, the power storage device 10 creates the first string S1 by interposing the wiring mechanism 11 in the middle of the first power line 71 extending from the first string S1, which is one of the four strings S of the solar panel 2. Only the stored electric power is the target for charging the power storage mechanism 12. Here, since the conventional power storage device treats the electric power generated by one solar panel 2 as a group, it is difficult to separate and use the large electric power generated biased during the day at a predetermined ratio. On the other hand, since the power storage device 10 targets only the power generated by the first string S1 for charging the power storage mechanism 12, a quarter of the power from the solar panel 2 is used for charging the power storage mechanism 12. The remaining three quarters can be used for other purposes (use with load 5 or power sale) while being used.

  Thereby, the power storage device 10 uses, for example, the power charged in the power storage mechanism 12 during the day and the power stored in the power storage mechanism 12 during the time when the solar panel 2 does not generate power. 3 can be used, and about one-fourth of the power generation amount can be used even in a time period when power generation is not performed. For this reason, the power storage device 10 can reduce the peak power generation amount in the solar panel 2 and can widen the time period for generating electric power, and can substantially level the mode of power generation. In addition, the power storage device 10 can use all the power as in the conventional case without charging by the power storage mechanism 12 by setting the first electric circuit EL1 even during the daytime. Therefore, the power storage device 10 can use the electric power generated by the solar panel 2 with a simple configuration by dividing it at a predetermined ratio, and can increase the degree of freedom in using the generated electric power.

  In addition, the power storage device 10 uses the wiring mechanism 11 in the middle of the first power line 71 extending from the first string S1 of the four strings S of the solar panel 2 to generate the power generated by the first string S1. Only the power storage mechanism 12 is charged. For this reason, the power storage device 10 can reduce the capacities of the power storage mechanism 12 and the DC / DC converter 38, and can reduce the size and cost.

  The power storage device 10 according to the first embodiment of the ophthalmic apparatus according to the present disclosure can obtain the following functions and effects.

  The power storage device 10 includes a power storage mechanism 12 that charges power generated by the solar panel 2 as a power generation device, a first electric circuit EL1 from the solar panel 2 to the power conditioner 3, and a second electric circuit EL2 from the solar panel 2 to the power storage mechanism 12. And a wiring mechanism 11 that forms a third electric circuit EL3 from the power storage mechanism 12 to the power conditioner 3. And the electrical storage apparatus 10 has the wiring mechanism 11 interposed in the middle of the power line (71 to 74) from the solar panel 2 to the power conditioner 3, and the first in the wiring mechanism 11 by the controller 13 and the drive controller 40 as the control unit. The electric circuit EL1, the second electric circuit EL2, and the third electric circuit EL3 are switched. As a result, the power storage device 10 simply passes the wiring mechanism 11 in the middle of the power line from the solar panel 2 to the power conditioner 3, and causes the power generated by the solar panel 2 to be stored in the power storage mechanism 12 without causing the power conditioner 3 to change. The battery can be appropriately charged and discharged appropriately.

  In particular, the power storage device 10 according to the first embodiment forms the second electric circuit EL2 by interposing the wiring mechanism 11 in the middle of the power lines (71 to 74) connected to the solar panel 2, and the DC power from the solar panel 2 is generated. The power storage mechanism 12 is charged via the DC / DC converter 38. For this reason, the power storage device 10 according to the first embodiment can prevent power from being reduced due to the conversion efficiency, for example, by converting from direct current to alternating current and then converting to direct current, and charging more efficiently. Can do.

  In the power storage device 10, the wiring mechanism 11 has a first power line 71 extending from a single string S (a first string S <b> 1 of the four strings S in the first embodiment) of the plurality of strings S of the solar panel 2. Intervened in the middle of For this reason, the power storage device 10 charges a part of the power generated by the solar panel 2 with the power storage mechanism 12 and uses the other part as appropriate with the load 5 as in the prior art, or through the wattmeter 6 and the commercial power system. E can be used by appropriately selling power to E. Therefore, the power storage device 10 can cut and use the electric power generated by the solar panel 2 at a predetermined ratio, and can increase the degree of freedom in using the electric power.

  In the power storage device 10, the wiring mechanism 11 is interposed in the middle of the power line (first power line 71) extending from the second string S 2 that is paired with the first string S 1 in the power conditioner 3. A fourth electric circuit EL4 provided with a backflow prevention unit (backflow prevention diode 39 in the first embodiment) that prevents backflow of current to the string S2 is formed. For this reason, the power storage device 10 can prevent the backflow from the power storage mechanism 12 to the second string S2 even if the power charged to the power storage mechanism 12 is sent to the power conditioner 3 in a scene where the solar panel 2 is not generating power. The power charged by the power storage mechanism 12 can be used or sold while preventing the occurrence of problems in the two strings S2.

  In the power storage device 10, the control controller 13 and the drive controller 40 have the first electric circuit EL <b> 1, the second electric circuit EL <b> 2, and the third electric circuit EL <b> 3 in the wiring mechanism 11 according to the amount of power generated in the solar panel 2 and the state of the electric storage mechanism 12. And switch. Therefore, the power storage device 10 can charge the power storage mechanism 12 with the electric power from the solar panel 2 by setting the second electric circuit EL2 in a state suitable for charging, and the first electric circuit EL1 in a state not suitable for charging. Thus, the power from the solar panel 2 can be used as in the conventional case. In addition, the power storage device 10 can use the power charged in the power storage mechanism 12 by using the third electric circuit EL3 in a state suitable for discharging, and can be used in the first electric circuit EL1 in a state not suitable for discharging. The electric power from the solar panel 2 can be used as in the conventional case.

  Therefore, the power storage device 10 according to the present invention can be easily attached to a house or the like provided with the solar panel 2 as a power generation device.

  As mentioned above, although the electrical storage apparatus of this indication was demonstrated based on each Example, about a specific structure, it is not restricted to each Example, and does not deviate from the summary of the invention which concerns on each claim of a claim As long as the design is changed or added, it is allowed.

  For example, in Example 1, only the electric power which the electrical storage apparatus 10 created with the electric power generating apparatus (solar panel 2) shall be charged. However, the power storage device 10 may be charged with power from the commercial power system E, and is not limited to the configuration of the first embodiment. In this case, the power storage device 10 can use power more economically, for example, by charging inexpensive nighttime power and using the charged power in the daytime.

  Moreover, in Example 1, the wiring mechanism 11 of the electrical storage device 10 can form the fourth electric circuit EL4 from the second string S2 (solar panel 2) to the power converter 3, however, the photovoltaic power generation system (1) to be attached If the power controller 3 is not composed of two strings, or the wiring mechanism 11 is provided so as to form the first electric circuit EL1 to the third electric circuit EL3 also in the other string of the pair. The fourth electric circuit EL4 may not be formed, and is not limited to the configuration of the first embodiment. In addition, when the power conditioner 3 of the photovoltaic power generation system (1) to be installed is a set of three or more strings, the fourth number is set in accordance with the number of strings including the wiring mechanism (11) as a set. As a configuration that can form an electric circuit similar to the electric circuit EL4, it is desirable to interpose a wiring mechanism (11) also in the power lines extending from them.

  Furthermore, in Example 1, the single electrical storage apparatus 10 shall be provided with respect to a power generator (solar panel 2). However, a plurality of power storage devices 10 may be provided for the power generation device, and is not limited to the configuration of the first embodiment. For this reason, since the electrical storage apparatus 10 can be attached with respect to the single electric power generating apparatus as many as the string which it has, it can be easily set as arbitrary receiving capacities.

  In the first embodiment, the voltage measuring unit 37 is provided only on the first electric wire 31 in the wiring mechanism 11. However, in the power storage device 10, the voltage measuring unit (37) may also be provided on the fourth electric wire 35 of the wiring mechanism 11. In this case, since the power generation amount in the second string S2 can also be acquired, the power generated by the power generation device (solar panel 2) can be used more efficiently and more efficiently. This is due to the following. When the voltage measurement part 37 is provided only in the 1st electric wire 31, it will be judged only by the electric power generation amount of the 1st string S1 whether the solar panel 2 is generating electric power. For this reason, it can be judged whether the solar panel 2 is generating electric power more appropriately by also acquiring the electric power generation amount in the 2nd string S2.

  Here, even if the first string S1 and the second string S2 are provided adjacent to the same solar panel 2 with the same size (power generation area) as in the first embodiment, the power generation amounts do not necessarily match. Not. For this reason, the first string S1 may not generate power (including a power generation amount smaller than a predetermined value), and the second string S2 may generate power. Here, for example, when the solar panel 2 is generating power, the power is used. When the solar panel 2 stops generating power, the power stored in the power storage mechanism 12 is set to be used. If the voltage measuring unit 37 is provided in the first string S1, the first string S1 does not generate power. Therefore, regardless of whether or not the second string S2 generates power, the third electric circuit EL3 is formed to charge the power storage mechanism 12 with electric power. Will be used. Then, if the power from the second string S2 is small with respect to the power from the power storage mechanism 12, and the difference between the powers is large, the power from the second string S2 cannot be used substantially, and the power from the power storage mechanism 12 Only power may be output from the power conditioner 3. For this reason, the power from the created second string S2 cannot be used. On the other hand, if the power generation amount of the second string S2 is also acquired, it can be determined that the second string S2 is generating power, for example, waiting for the use of power from the power storage mechanism 12 It is possible to control so that the power from the second string S2 can be used. Thereby, by providing the voltage measurement part (37) also in the 4th electric wire 35, while being able to control more appropriately so that the electric power from 2nd string S2 could be utilized, it created more efficiently with the power generator (solar panel 2). Electricity can be used.

  In the first embodiment, the wiring mechanism 11 is configured as shown in FIG. However, the wiring mechanism 11 is interposed in the middle of the power lines (71 to 74) from the solar panel 2 to the power conditioner 3, and the first electric circuit EL1 from the solar panel 2 to the power conditioner 3 and the power storage mechanism from the solar panel 2 to the power conditioner 3. As long as the second electric circuit EL2 to 12 and the third electric circuit EL3 from the power storage mechanism 12 to the power conditioner 3 can be switched, the configuration is not limited to that of the first embodiment.

  In Example 1, the example which attaches the electrical storage apparatus 10 to the solar power generation system 1 in which the storage battery is not provided is shown. However, the power storage device 10 may be attached to the solar power generation system (1) in which a storage battery is already provided. Even in this case, the photovoltaic power generation system (1) can be operated in the same manner as before being attached, and it is possible to increase the number of storage batteries, and the same effect as in the first embodiment can be obtained.

  In the first embodiment, a CT sensor is provided in the distribution board 4 so that the amount of power required by the load 5 can be acquired, and the acquired information is output to the controller 13. However, the controller 13 is not limited to the configuration of the first embodiment as long as it acquires the amount of power required by the load 5. As another method, for example, instead of the wattmeter 6, it is possible to acquire the amount of power necessary for the load 5 together with the measurement of the amount of power sold or the amount of power purchased, and transmit those data wirelessly or by wire. It is possible to provide a smart meter that can be used.

  2 Solar panel (as an example of a power generation device) 3 Power conditioner 10 Power storage device 11 Wiring mechanism 12 Power storage mechanism 13 Controller (as an example of a control unit) 39 Backflow prevention diode 40 (as an example of a backflow prevention unit) 40 (Control unit) Drive controller 71 (as an example of power line) first power line 72 (as example of power line) second power line 73 (as example of power line) third power line 74 (as example of power line) fourth Power line EL1 1st electric circuit EL2 2nd electric circuit EL3 3rd electric circuit EL4 4th electric circuit S string S1 1st string S2 2nd string

Claims (4)

A power storage mechanism that charges the power generated by the power generator from natural energy;
By being interposed in the middle of the power line from the power generator to the power converter, a first electric circuit from the power generator to the power controller, a second electric circuit from the power generator to the power storage mechanism, and from the power storage mechanism to the power controller A wiring mechanism forming a third electric circuit;
A power storage device comprising: a control unit that controls switching between the first electric circuit, the second electric circuit, and the third electric circuit in the wiring mechanism.   The power storage device according to claim 1, wherein the wiring mechanism is interposed in the middle of the power line extending from a single string among a plurality of strings included in the power generation device. The string with the wiring mechanism interposed as a first string,
The wiring mechanism is interposed in the middle of the power line that extends from the second string that is paired with the first string in the power conditioner, thereby preventing a backflow prevention unit that prevents backflow from the power conditioner to the second string. The power storage device according to claim 2, wherein a fourth electric circuit provided with an electric field is formed.   The said control part switches the said 1st electric circuit in the said wiring mechanism, the said 2nd electric circuit, and the said 3rd electric circuit according to the electric power generation amount in the said electric power generating apparatus, and the state of the said electrical storage mechanism, It is characterized by the above-mentioned. The power storage device according to any one of claims 1 to 3.