JP7123587B2 - power supply system - Google Patents

Description

TECHNICAL FIELD The present invention relates to technology of a power supply system including a plurality of storage batteries and a plurality of power generation units.

2. Description of the Related Art Conventionally, technology of a power supply system in which a plurality of storage batteries and a plurality of power generation units are provided between a system power source and a load is known. For example, it is as described in Patent Document 1.

Patent Literature 1 describes a power supply system in which a plurality of units including a power storage device and a photovoltaic power generation device are connected to a distribution line that connects a commercial power source and a load.

The power supply system described in Patent Literature 1 described above performs load follow-up operation in which power is output from each unit based on the power flowing through the distribution line. In this way, in the power supply system, by load following operation, power is first output from the unit arranged on the most downstream side. An operation is performed in which electric power is output from the unit arranged in the .

Here, in the power supply system, it may be desired to supply the power generated by the power generation unit to the load (self-consumed).

However, in the power supply system described in Patent Literature 1, it is conceivable that it is difficult to promote self-consumption. That is, in the power supply system, when the power generated by the photovoltaic power generation device of the most downstream unit cannot cover the power consumption of the load, priority is given to the power generated by the photovoltaic power generation device of the unit on the upstream side. Then, the discharged power from the power storage device of the unit on the downstream side is supplied to the load.

Here, in the above power supply system, if the power output from the most downstream unit can cover the power consumption of the load, the power generated by the photovoltaic power generation device of the upstream unit is charged to the power storage device of the unit. be done. Here, when the power generated by the photovoltaic power generation device of the unit on the upstream side surpluses the amount of power that can be charged in the power storage device of the unit, the surplus power is reversely flowed to the commercial power supply side. . As described above, in the above power supply system, the power generated by the photovoltaic power generation device that can be supplied to the load is reversely flowed to the commercial power supply side instead of the load, which makes it difficult to promote self-consumption. Therefore, it is desirable to execute control for promoting self-consumption of power generated by the power generation unit.

JP 2017-163747 A

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and the problem to be solved is to provide a power supply system capable of control to promote self-consumption of the power generated by the power generation unit. be.

The problems to be solved by the present invention are as described above, and the means for solving the problems will now be described.

That is, in claim 1, a plurality of devices connected in series between the system power source and the load, capable of charging power, and discharging the charged power to supply power to the load a storage battery, a plurality of power generation units connected to the storage battery and circulating generated power between the system power supply and the load, and a control unit capable of controlling charging and discharging of the plurality of storage batteries. wherein the control unit can set the storage battery to a first mode for controlling charging and discharging based on instructions from the control unit, and totaling the amount of power generated by the plurality of power generation units charging and discharging of the storage battery set to the first mode is controlled based on a result of comparing the total amount of power generated and the amount of power consumed by the load, and the total amount of power generated is equal to the amount of power consumed by the load ; If the amount is less than the amount, a discharge instruction or a standby instruction is issued to the storage battery set to the first mode, the difference between the power consumption amount and the total power generation amount, the maximum discharge amount of the storage battery, The number of the storage batteries to be discharged is determined based on the number of the storage batteries to be discharged, and based on the number of the storage batteries to be discharged, a discharge instruction is issued from among the storage batteries set to the first mode that can be discharged. A storage battery is determined, and among the storage batteries set to the first mode, a standby instruction is issued to the storage battery for which no discharge instruction is to be issued .

In claim 2, the control unit sets a discharge priority order for the storage batteries set to the first mode, and determines a storage battery to which a discharge instruction is to be issued based on the discharge priority order. .

In claim 3, when the total power generation amount is equal to or greater than the power consumption amount, the control unit issues a charging instruction or a standby instruction to the storage battery set to the first mode. .

In claim 4, a plurality of storage batteries connected in series between the system power supply and the load, capable of charging power, and capable of supplying power to the load by discharging the charged power. and a plurality of power generation units connected to the storage battery for circulating generated power between the system power supply and the load, and a control unit capable of controlling charging and discharging of the plurality of storage batteries. In the supply system, the control unit can set the storage battery to a first mode for controlling charging and discharging based on instructions from the control unit, and the total amount of power generated by the plurality of power generation units is Controlling charging and discharging of the storage battery set to the first mode based on a result of comparing the power generation amount and the power consumption amount consumed by the load, wherein the total power generation amount is equal to or greater than the power consumption amount , a charging instruction or a standby instruction is issued to the storage battery set to the first mode, and based on the difference between the total power generation amount and the power consumption amount and the maximum charging amount of the storage battery to determine the number of the storage batteries to be charged, based on the number of the storage batteries to be charged, to determine which of the storage batteries set in the first mode is to be charged; , a standby instruction is given to the storage battery for which no charging instruction is given.

In claim 5, the control unit sets charging priorities for the storage batteries set to the first mode, and determines a storage battery to be instructed to charge based on the charging priorities . .

In claim 6, the control unit can set the storage battery to a second mode in which charge/discharge control is performed based on power flowing between the system power supply and the load, and the plurality of storage batteries Among them, the second mode is set for at least one storage battery, and the first mode is set for the remaining storage batteries .

In claim 7, the control unit sets the second mode for the most upstream storage battery connected to the system power supply side most among the plurality of storage batteries .

As effects of the present invention, the following effects are obtained.

In claim 1, control for promoting self-consumption of power generated by the power generation unit can be executed. Moreover, in claim 1, when the total power generation amount is insufficient for the power consumption amount, the storage battery can be controlled based on the insufficient power amount. In addition, according to claim 1, it is possible to determine the storage battery for which the discharge instruction is to be issued and the storage battery for which the standby instruction is to be issued, based on the number of storage batteries to be discharged and the number of storage batteries that can actually be discharged.

In claim 2, it is possible to suppress unevenness in the amount of discharge in each storage battery.

In claim 3, when the total power generation amount is surplus with respect to the power consumption amount, the storage battery can be controlled based on the surplus power amount.

In claim 4, control for promoting self-consumption of power generated by the power generation unit can be executed. Moreover, in claim 4, when the total power generation amount is surplus with respect to the power consumption amount, the storage battery can be controlled based on the surplus power amount. Also, in claim 4, the number of storage batteries to be charged and the number of storage batteries that can actually be charged can be used to determine the storage batteries to which the charge instruction is given and the storage batteries to which the standby instruction is given.

In claim 5, it is possible to suppress unevenness in the amount of remaining power in each storage battery.

In claim 6, it is possible to respond to rapid changes in the amount of power generation and power consumption.

In claim 7, it is possible to secure electric power in the most upstream storage battery in order to cope with sudden changes in the amount of power generation and power consumption.

1 is a block diagram showing the configuration of a power supply system according to one embodiment of the present invention; FIG. FIG. 2 is a block diagram showing an example of a power supply mode; The block diagram which showed an example of the electric power supply system which set the 1st mode and 2nd mode with respect to a storage battery. 4 is a flowchart showing charge/discharge control processing;

Below, the electric power supply system 1 which concerns on one Embodiment of this invention is demonstrated using FIG.

The power supply system 1 is applied to a residential block T having a plurality of detached houses (houses H) and various facilities. In this embodiment, four houses H (a first house H1, a second house H2, a third house H3 and a fourth house H4) are provided as a plurality of (single-family) houses H in the residential block T. In the residential block T, an electric power retailer purchases electric power in bulk from an electric power company (system power supply S), and the purchased electric power is supplied (sold) to each house H as appropriate.

The power supply system 1 appropriately supplies (accommodates) the power collectively purchased by the power retailer from the power company to a plurality of residences H (the first residence H1, the second residence H2, the third residence H3, and the fourth residence H4). ) is a system for

In the power supply system 1, a plurality of of the power storage system H20 is connected. The power storage system H20 is owned by each of a plurality of houses H (first house H1, second house H2, third house H3, and fourth house H4). In the power supply system 1, in the power path L, the power storage system H20 of the first house H1, the power storage system H20 of the second house H2, the power storage system H20 of the third house H3, and the power storage system H20 of the fourth house H4 are upstream. are connected in series with each other in order from to downstream.

The power supply system 1 is configured such that, between houses that own the power storage system H20, power stored in one house can be transferred to another house. In this embodiment, the power supply system 1 includes a plurality of power storage systems H20 and EMS60.

The power storage system H20 stores power generated using sunlight and supplies the power to the load H10. The power storage system H20 includes a photovoltaic power generation unit H30, a storage battery H40, and a hybrid power conditioner H50.

The solar power generation unit H30 is a device that generates power using sunlight. The solar power generation unit H30 is configured by a solar cell panel or the like. The photovoltaic power generation unit H30 is connected to a storage battery H40 similarly provided in the same house H. The photovoltaic power generation unit H30 is installed in a sunny place such as on the roof of the house H, for example. The power generated by the photovoltaic power generation unit H30 can be charged in the corresponding storage battery H40 (similarly provided in the same house H).

The storage battery H40 appropriately charges and discharges power from the system power supply S and power (generated power) from the solar power generation unit H30. The storage battery H40 is configured by, for example, a lithium ion battery. The storage battery H40 is connected to the photovoltaic power generation unit H30 through a predetermined distribution line via a hybrid power conditioner H50 and the like, which will be described later.

In this embodiment, the storage battery H40 has a maximum discharge amount of 2000 (W). The maximum discharge amount refers to the maximum amount of electric power that the storage battery H40 can discharge per unit time. Further, it is assumed that the storage battery H40 also has a maximum charging amount (maximum amount of electric power that can be charged by the storage battery H40 per unit time) of 2000 (W).

In addition, in preparation for a power outage, the storage battery H40 is designed not to discharge even if it is in a dischargeable state when the remaining amount of stored electricity reaches a predetermined value (30% or less in this embodiment) with respect to the capacity. is set to

The storage battery H40 has a plurality of aspects (modes) regarding charging and discharging of electric power. The plurality of aspects include a first mode (charge/discharge control mode) and a second mode (eco mode). The first mode and the second mode are set (switched) by the EMS 60, which will be described later.

When the first mode is executed, storage battery H40 is in a state capable of executing an operation instructed by EMS 60, which will be described later. Specifically, when a discharge instruction is issued, the storage battery H40 enters a dischargeable state, and enters a discharge state or a standby state according to the power demand of the load H10. In addition, when the standby instruction is given, the storage battery H40 enters a standby state in which charging and discharging are not performed. In addition, the storage battery H40 enters a chargeable state when a charge instruction is issued, and enters a charging state or a standby state depending on the remaining power amount of the storage battery H40 and the surplus power amount of the solar power generation unit H30.

Further, when the second mode is executed, the storage battery H40 controls charge/discharge by load following operation based on the power flowing through the power path L. In this embodiment, the storage battery H40 charges and discharges an adjusted amount of power according to the detection result of a predetermined sensor (not shown) that detects the power flowing through the power path L. The predetermined sensor is configured to be capable of detecting power flowing through the connection point P on the power path L. As shown in FIG.

Specifically, when the second mode is executed, if the power generated by the solar power generation unit H30 alone is insufficient for the power consumption of the load H10, the storage battery H40 detects that the above-described predetermined sensor discharges power according to the detection result of In addition, if there is surplus power (surplus power with respect to the power consumption of the load H10, hereinafter simply referred to as "surplus power" in some cases) from the power generated by the solar power generation unit H30, the storage battery H40 The surplus power is charged. Moreover, when there is surplus power and the storage battery H40 is fully charged, the surplus power flows backward to the system power source S.

Also in the first mode, when a discharge instruction is given, the storage battery H40 performs load following operation. When the load following operation is performed, the storage battery H40 discharges the adjusted electric energy according to the detection result of the predetermined sensor.

The hybrid power conditioner H50 appropriately converts electric power (hybrid power conditioner). The hybrid power conditioner H50 can output power generated by the solar power generation unit H30 and power discharged from the storage battery H40 to the load H10, and outputs power generated by the solar power generation unit H30 and power from the system power supply S. can be output to the storage battery H40. In addition, hybrid power conditioner H50 is connected to connection point P of electric power path L via a predetermined distribution line.

The hybrid power conditioner H50 can control the operation of the storage battery H40. Further, in the present embodiment, the mode setting (first mode, second mode, etc.) for the storage battery H40 by the EMS 60, which will be described later, is performed via the hybrid power conditioner H50.

The EMS 60 is an energy management system that manages the operation of the power supply system 1 . The EMS 60 includes a storage unit such as RAM and ROM, an arithmetic processing unit such as CPU, an input/output unit such as I/O, and the like. The EMS 60 can perform predetermined arithmetic processing, storage processing, and the like. The EMS 60 stores in advance various information, programs, and the like used when controlling the operation of the power supply system 1 .

Specifically, the EMS 60 is electrically connected to the hybrid power conditioner H50 of each house H (whether wired or wireless). The EMS 60 can acquire various information such as the operation status of the storage battery H40 (for example, the mode set, whether it is discharging, etc.), the remaining amount of storage, the amount of discharged power, and the chargeable amount. In addition, the EMS 60 can acquire various information such as the operation status of the photovoltaic power generation unit H30 and the power generation amount through the hybrid power conditioner H50. Note that the EMS 60 may acquire the information directly from the solar power generation unit H30 instead of via the hybrid power conditioner H50.

Further, the EMS 60 can determine the mode of the storage battery H40 of each house H based on the acquired information and the like, and can cause the storage battery H40 to execute the determined mode.

When causing the storage battery H40 to execute the first mode, the EMS 60 can issue a discharge instruction, a charge instruction, and a standby instruction based on the acquired information.

The EMS 60 also calculates the total amount of power generated by all the photovoltaic power generation units H30 indicated by A in FIG. hereinafter referred to as "total power consumption"), a discharge instruction, a charge instruction, and a standby instruction can be given.

Further, the EMS 60 can determine the discharge priority described below for the storage battery H40 based on the acquired information. The discharge priority is mainly used when the first mode is executed, and is the priority of discharge in the storage battery H40 in which the first mode is executed.

In the setting of the discharge priority, it is possible to determine that among the storage batteries H40 for which the first mode is executed, the smaller the discharge amount on the previous day, the higher the priority. Note that the discharge priority is not limited to being determined based on the previous day's discharge amount, and can be determined based on various information. For example, among the storage batteries H40 for which the first mode is executed, the storage battery H40 with the smaller accumulated discharged power amount may be determined as having a higher priority. The integrated discharged power amount is a total integrated value for a predetermined period (for example, from the time when each storage battery H40 was installed until 23:00 on the previous day). Note that the predetermined period is not limited to this and can be any period. Further, the discharge priority may be determined such that, among the storage batteries H40 in which the first mode is executed, the storage battery H40 having a larger remaining charge has a higher priority.

Further, the EMS 60 can determine the charging priority described below for the storage battery H40 based on the acquired information. The charging priority is mainly used when the first mode is executed, and is the charging priority in the storage battery H40 in which the first mode is executed.

In the setting of the charging priority, it is possible to determine that among the storage batteries H40 for which the first mode is executed, the lower the remaining charge, the higher the priority. Note that the charging priority order is not limited to being determined based on the remaining amount of power storage, and can be determined based on various types of information.

An example of a power supply mode in the power supply system 1 will be described below with reference to FIG. 2 .

In the following description, the storage batteries H40 of all the houses H (the first house H1, the second house H2, the third house H3 and the fourth house H4) indicated by C in FIG. is not performed (the second mode is set instead of the first mode).

In the load H10 of each house H, when there is a demand for power (for example, when the load H10 consumes power), the power from the power supply source is supplied to the load H10 of each house H through the power path L. Supplied to H10.

In each house H, as shown in FIG. 2, power generated by the photovoltaic power generation unit H30 is supplied to the load H10 via a predetermined distribution line. Further, when the power generated by the photovoltaic power generation unit H30 is insufficient for the load H10, power from the system power supply S or the like is supplied to the load H10 of each house H through the power path L. When electric power from the system power supply S or the like circulates through the electric power path L, the storage battery H40 of each house H discharges according to the electric power circulating through the electric power path L by load following operation. Thus, the electric power discharged from the storage battery H40 of each house H is supplied to the load H10 of each house H through a predetermined distribution line. As a result, when the power discharged from the storage battery H40 of each house H is supplied to the load H10, the power from the system power source S or the like decreases.

Specifically, in FIG. 2, the power supplied from the system power supply S or the like to the load H10 of each house H (with respect to the power consumption of the load H10, the power generated by the photovoltaic power generation unit H30 of the fourth house H4 is Insufficient electric power), all the electric power generated by the storage battery H40 of the fourth house H4 is supplied to the load H10. In addition, in FIG. 2, in response to the insufficient power output from the solar power generation unit H30 and the storage battery H40 of the fourth house H4, part of the power generated by the solar power generation unit H30 of the third house H3 is used as a load. An example supplied by H10 is shown.

Moreover, as shown in FIG. 2, when the power generated by the photovoltaic power generation unit H30 is surplus to the load H10, the surplus power is charged into the storage battery H40 of the house H. As shown in FIG.

Specifically, FIG. 2 shows an example in which, of the power generated by the photovoltaic power generation unit H30 of the third house H3, surplus power for the load H10 is charged into the storage battery H40 of the third house H3. there is In addition, in FIG. 2, since the power output from the fourth house H4 and the third house H3 covers the power consumption of the load H10, the power generated by the photovoltaic power generation unit H30 of the second house H2 is used for maximum charging. The example which charged the storage battery H40 of the 2nd house H2 with the quantity is shown.

Further, when the surplus electric power cannot be charged to the storage battery H40 any more, the surplus electric power is reverse-flowed to the system power source S via a predetermined distribution line.

Specifically, FIG. 2 shows an example in which, of the power generated by the photovoltaic power generation unit H30 of the second house H2, the power exceeding the maximum charge amount of the storage battery H40 is reversely flowed to the system power source S. . Moreover, FIG. 2 shows an example in which all of the power generated in the first house H1 is reversely flowed to the grid power supply S because the storage battery H40 of the first house H1 is fully charged.

With the power supply mode as described above, in the power supply system 1, the power from the photovoltaic power generation unit H30 and the storage battery H40 of each house H is supplied not only to the load H10 of one's own house H, but also to other houses H. It can also be supplied (accommodated) to the load H10.

Further, in the present embodiment, when the storage battery H40 of each house H is charged using the power from the system power supply S, the residents of each house H purchase the power from the power retailer. . In this way, the residents of each house H can purchase and use electricity that is relatively cheaper than the general price. In addition, the power generated by the photovoltaic power generation unit H30 of each house H and the power discharged from the storage battery H40 are purchased by the power retailer from the residents of each house H. Also, surplus power generated by the photovoltaic power generation unit H30 of each house H (that is, reverse power flow) is purchased by the power company from the power retailer.

Here, as described above, the power storage system H20 of the first house H1, the power storage system H20 of the second house H2, the power storage system H20 of the third house H3, and the power storage system H20 of the fourth house H4 are arranged from the upstream side to the downstream side. are connected in series with each other.

Therefore, when all the storage batteries discharge by the load following operation, the storage battery H40 of the fourth house H4 connected to the most downstream side is configured to discharge most easily. Also, the storage battery H40 of the third house H3 connected to the upstream side of the storage battery H40 of the fourth house H4 is configured to be easily discharged next. Also, the storage battery H40 of the second house H2 connected to the upstream side of the storage battery H40 of the third house H3 is configured to be easily discharged next. Also, the storage battery H40 of the first house H1 connected to the upstream side of the storage battery H40 of the second house H2 is configured to be discharged next easily (that is, discharged most difficultly).

If the easiness (difficulty) of discharging each storage battery is different from each other, the discharge amount of each storage battery is likely to be uneven. In this way, if the discharge amount of each storage battery is uneven, the degree of deterioration of each storage battery will be different, and the amount of power sold to the power retailer will be different, which is not desirable.

Further, in the power supply system 1, it may be desired to supply the power generated by the photovoltaic power generation unit H30 to the load H10 (self-consumption). In the above self-consumption, "supplying to the load H10" means not only supplying the power generated by the photovoltaic power generation unit H30 directly to the load H10, but also by discharging the generated power charged in the storage battery H40. Indirectly supplying load H10 is included.

In this case, it is desirable to preferentially use the power generated by the photovoltaic power generation unit H30 with respect to the power consumption of the load H10. In addition, it is desirable to charge the storage battery H40 prior to reverse power flow to the grid power source S with the generated power. In other words, it is not desirable to reverse the power that can be self-consumed to the system power source S.

However, as shown in FIG. 2, when the second mode is set for the storage batteries H40 of all the houses H, the load following operation is performed as described above. Difficult to promote. That is, when the second mode is set for the storage batteries H40 of all houses H, as described above, the power generated by the photovoltaic power generation unit H30 of the fourth house H4 connected furthest downstream is applied to the load H10. On the other hand, if there is a shortage, the power generated by the storage battery H40 of the fourth house H4 is prioritized over the power generated by the photovoltaic power generation unit H30 of the house H connected upstream of the fourth house H4. Supplied to H10.

In the above case, as shown in FIG. 2, when the power output of the fourth house H4 and the third house H3 covers the power consumption of the load H10, the second house H2 and the first house H1 Since the power generated by the photovoltaic power generation unit H30 is surplus to the load H10, each storage battery H40 is charged. Here, when the generated power exceeds the maximum charge amount of the storage battery H40 or when the storage battery H40 is fully charged, the surplus generated power is reversely flowed to the system power supply S. For this reason, in the example described above, it is difficult to promote self-consumption of the power generated by the photovoltaic power generation unit H30, which is undesirable.

Therefore, in the power supply system 1, the first In addition to setting the mode, a specific process (hereinafter referred to as "charge/discharge control process") can be executed. The charge/discharge control process will be described below.

In the charge/discharge control process, power generated by all the photovoltaic power generation units H30 is supplied to the load H10 as much as possible, and based on the result of comparing the total power generation amount and the power consumption amount, the first mode to control charging and discharging of the storage battery H40 set to .

FIG. 3 shows an example of the power supply system 1 in which charge/discharge control processing is executed. In the example shown in FIG. 3, the first mode is set for the storage battery H40 of the house H indicated by D (the second house H2, the third house H3, and the fourth house H4), and the house H indicated by E (the first house The second mode is set for the storage battery H40 of H1).

The charge/discharge control process executed by the EMS 60 will be described below with reference to the flowchart of FIG.

In step S10, the EMS 60 determines whether or not the total power consumption is greater than the total power generation. When the EMS 60 determines that the total power consumption is greater than the total power generation (step S10: YES), the process proceeds to step S11. On the other hand, when the EMS 60 determines that the total power consumption is less than or equal to the total power generation (step S10: NO), the process proceeds to step S18.

In step S11, the EMS 60 calculates the amount of discharge required for the storage battery H40 of each house H (hereinafter referred to as "requested amount of discharge") when the total amount of power generation is insufficient for the total amount of power consumption. do. The discharge request amount is obtained by subtracting the total power generation amount from the total power consumption amount. EMS60 transfers to the process of step S12 next.

In step S12, the EMS 60 calculates the number of storage batteries H40 for which the first mode is set to be discharged according to the required discharge amount (hereinafter referred to as "the number of required discharges"). The number of requested discharge units is obtained by dividing the requested discharge amount by the maximum discharge amount of the storage battery H40. EMS60 transfers to the process of step S13 next.

Here, when the result obtained by dividing the discharge request amount by the maximum discharge amount of the storage battery H40 includes a decimal number, the number after the decimal point can be rounded up or rounded down. When calculating by rounding up to the nearest whole number, the total amount of electric power discharged by the storage batteries H40 in the number of requested discharge units is larger than the requested discharge amount. When the above number of storage batteries H40 are discharged, power supply from the system power source S or the storage battery H40 of the first house H1 in which the second mode is set can be suppressed.

Further, when calculation is performed by omitting the decimal point, the total amount of electric power discharged by the storage batteries H40 in the number of requested discharge units is smaller than the requested discharge amount. When the above number of storage batteries H40 are discharged, the discharge power of the storage batteries H40 alone is insufficient for the discharge request amount. Although power supply from H40 is required, such power supply can be minimized. After calculating the number of units required for discharge, the EMS 60 proceeds to the process of step S13.

In step S13, the EMS 60 calculates the number of dischargeable storage batteries H40 among the storage batteries H40 for which the first mode is set (hereinafter referred to as "dischargeable number"). The number of dischargeable batteries is obtained from the total number of storage batteries H40 for which the first mode is set and whose remaining charge is equal to or more than a predetermined value (30% or more in this embodiment) with respect to capacity. . EMS60 transfers to the process of step S14 next.

In step S14, the EMS 60 determines whether or not the number of dischargeable units is greater than or equal to the number of dischargeable units. When the EMS 60 determines that the number of dischargeable units is greater than or equal to the number of units required for discharge (step S14: YES), the process proceeds to step S15. On the other hand, when the EMS 60 determines that the number of dischargeable units is less than the number of units required for discharge (step S14: NO), the process proceeds to step S16.

In step S15, the EMS 60 calculates the number of storage batteries H40 for which discharge instructions are to be issued (hereinafter referred to as "discharge instruction number") among the storage batteries H40 for which the first mode is set. In step S15, the number of requested discharges is set as the instructed number of discharges. EMS60 transfers to the process of step S17 next.

In step S16, the EMS 60 calculates the number of units instructed to discharge. In step S16, the dischargeable number is set as the discharge instructed number. EMS60 transfers to the process of step S17 next.

In step S17, the EMS 60 issues a discharge instruction to the storage batteries H40 corresponding to the discharge instruction number in order from the battery with the highest discharge priority. Further, the EMS 60 issues a standby instruction for the storage battery H40 for which the discharge instruction is not issued among the storage batteries H40 for which the first mode is set. After the process of step S17, the EMS 60 once terminates the charge/discharge control process.

As described above, in step S10, when it is determined that the total power consumption is equal to or less than the total power generation (step S10: NO), in step S18, out of the total power generation, surplus power amount (hereinafter referred to as “total surplus power amount”). The total surplus power amount is obtained by subtracting the total power consumption amount from the total power generation amount. EMS60 transfers to the process of step S19 next.

In step S19, the EMS 60 calculates the number of storage batteries H40 to be charged according to the total surplus power amount (hereinafter referred to as "requested number of charging") among the storage batteries H40 for which the first mode is set. The number of vehicles requested to be charged is obtained by dividing the total surplus power amount by the maximum charge amount of the storage battery H40.

Here, if the result of dividing the total surplus power amount by the maximum charge amount of the storage battery H40 includes a decimal, the number of units required to be charged can be calculated by rounding up or rounding down the decimal point. When calculating by omitting decimal places, the total amount of surplus power is larger than the sum of the power charged to the storage batteries H40 in the number of vehicles requested to be charged. When the above number of storage batteries H40 are charged, power supply from the system power supply S or the storage battery H40 of the first house H1 in which the second mode is set can be suppressed.

When calculating by rounding up to the nearest whole number, the total amount of surplus power is smaller than the sum of the power charged to the storage batteries H40 in the number of vehicles requested to be charged. When the above number of storage batteries H40 are charged, the total surplus power amount is insufficient for the power to be charged in the storage battery H40. Although power supply from the storage battery H40 of H1 is required, such power supply can be minimized. After calculating the number of vehicles to be charged, the EMS 60 proceeds to the process of step S20.

In step S20, the EMS 60 calculates the number of rechargeable batteries H40 (hereinafter referred to as "the number of rechargeable batteries") among the batteries H40 for which the first mode is set. The number of chargeable batteries is obtained from the total number of storage batteries H40 for which the first mode is set and whose remaining charge is less than a predetermined value (less than 100% in this embodiment) with respect to capacity. . EMS60 transfers to the process of step S21 next.

In step S21, the EMS 60 determines whether or not the number of chargeable vehicles is greater than or equal to the number of chargeable vehicles. When the EMS 60 determines that the number of chargeable devices is greater than or equal to the number of devices required to be charged (step S21: YES), the process proceeds to step S22. On the other hand, when the EMS 60 determines that the number of chargeable devices is less than the number of requested charging devices (step S21: NO), the process proceeds to step S23.

In step S22, the EMS 60 calculates the number of storage batteries H40 for which charging instructions are to be issued (hereinafter referred to as "number of charging instructions") among the storage batteries H40 for which the first mode is set. In step S22, the number of vehicles requested to be charged is set as the number of vehicles instructed to be charged. EMS60 transfers to the process of step S24 next.

In step S23, the EMS 60 calculates the number of vehicles instructed to be charged. In step S22, the number of chargeable vehicles is set as the instructed number of vehicles to be charged. EMS60 transfers to the process of step S24 next.

In step S24, the EMS 60 issues charging instructions to the storage batteries H40 corresponding to the number of charging instructions, in order from the battery with the highest charging priority. Further, the EMS 60 issues a standby instruction for the storage battery H40 for which the charge instruction is not issued among the storage batteries H40 for which the first mode is set. After the process of step S24, the EMS 60 once terminates the charge/discharge control process.

In this embodiment, the charge/discharge control process is repeatedly executed by the EMS 60 at predetermined intervals (for example, every minute).

By executing such a process, as described above, when the total power generation amount is insufficient for the total power consumption amount, the storage battery H40 for which the discharge instruction is issued to cover the power shortage can be discharged. Further, when the total amount of power generation is surplus with respect to the total amount of power consumption, the surplus power can be charged in the storage battery H40 for which the charging instruction has been issued. As a result, self-consumption can be promoted by supplying the power (total power generation) generated by the photovoltaic power generation unit H30 to the load H10. can.

In addition, by issuing a discharge instruction from the storage battery H40 with the highest discharge priority to the discharge request amount, it is possible to suppress the uneven discharge amount of the storage battery H40 of each house H. FIG. That is, as in the present embodiment, the smaller the previous day's discharge amount of the storage battery H40, the higher the priority, so that the discharge amount of the storage battery H40 can be equalized.

In addition, by instructing charging from the storage battery H40 having the highest charging priority with respect to the charge request amount, it is possible to suppress unevenness in the remaining power storage amount of the storage battery H40 of each house H. FIG. That is, as in the present embodiment, it is possible to equalize the remaining power levels of the storage battery H40 by determining that the lower the remaining power level of the storage battery H40, the higher the priority.

In addition, in the present embodiment, the second mode, not the first mode, is set for the storage battery H40 of the first house H1 connected furthest upstream. That is, the storage battery H40 of the first house H1 is discharged by the load following operation according to the electric power flowing through the power path L without receiving the discharge instruction, the charge instruction, or the standby instruction by the EMS 60.

As a result, the storage battery H40 of the first house H1 can respond to sudden changes in the total power consumption and total power generation, and can suppress power purchase from the system power source S. That is, for example, depending on the control interval of the charge/discharge control process by the EMS 60 as described above, the storage battery H40 for which a sudden change in the total power consumption or the total power generation cannot be handled, and the total power generation and the discharge instruction are issued. Since the amount of discharge cannot cover the total amount of power consumption, there is a risk that power will be purchased from the system power source S.

However, by causing the storage battery H40 of the first house H1 to perform load-following operation according to the power flowing through the power path L, the total amount of power generation and the discharge amount of the storage battery H40 for which the discharge instruction has been issued cannot cover the above. minutes of power can be discharged quickly. Thereby, power purchase from the system power source S can be suppressed.

In addition, in the present embodiment, the second mode is set for the storage battery H40 of the first house H1 connected to the furthest upstream side, which is the most difficult to discharge by the load following operation. power can be secured.

As described above, the power supply system 1 according to one embodiment of the present invention is
a plurality of storage batteries H40 connected in series between the system power source S and the load H10, capable of being charged with power, and capable of supplying power to the load by discharging the charged power;
a plurality of photovoltaic power generation units H30 (power generation units) connected to the storage battery H40 and circulating generated power between the system power source S and the load H10;
EMS 60 (control unit) capable of controlling charging and discharging of the plurality of storage batteries H40;
A power supply system 1 comprising
The EMS 60 (control unit)
A first mode for controlling charging and discharging based on instructions from the EMS 60 (control unit) can be set for the storage battery H40,
The first It controls the charging and discharging of the storage battery H40 set to the mode of .

With such a configuration, for example, when the total power generation amount is insufficient for the total power consumption amount, the storage battery H40 for which the discharge instruction has been issued can be discharged in order to cover the power shortage. Further, for example, when the total amount of power generation is surplus with respect to the total amount of power consumption, the surplus power can be charged into the storage battery H40 for which the charging instruction has been issued. As a result, self-consumption can be promoted by supplying the power (total power generation) generated by the photovoltaic power generation unit H30 to the load H10. can.

Further, in the power supply system 1,
The EMS 60 (control unit)
When the total power generation amount is smaller than the total power consumption amount (power consumption amount), a discharge instruction or standby instruction is issued to the storage battery H40 set to the first mode.

With such a configuration, when the total power generation amount is insufficient with respect to the total power consumption amount, the storage battery H40 can be controlled based on the insufficient power amount.

Further, in the power supply system 1,
The EMS 60 (control unit)
determining the number of the storage batteries H40 to be discharged based on the difference between the total power consumption (power consumption) and the total power generation and the maximum discharge amount of the storage batteries H40;
Based on the number of the storage batteries H40 to be discharged, a storage battery H40 to be instructed to discharge is determined from among the storage batteries H40 that can be discharged among the storage batteries H40 set to the first mode,
Of the storage batteries H40 set to the first mode, the standby instruction is issued to the storage battery H40 to which the discharge instruction is not issued.

With such a configuration, discharge is performed based on the number of storage batteries H40 to be discharged (requested number of discharge) determined according to the discharge request amount and the number of storage batteries H40 that can actually be discharged (dischargeable number). It is possible to determine the storage battery H40 for which the instruction is given and the storage battery H40 for which the standby instruction is given.

Further, in the power supply system 1,
The EMS 60 (control unit)
setting a discharge priority for the storage battery H40 set to the first mode;
Based on the discharge priority, the storage battery H40 to which the discharge instruction is to be issued is determined.

With such a configuration, it is possible to suppress unevenness in the amount of discharge in each storage battery H40.

Further, in the power supply system 1,
The EMS 60 (control unit)
When the total power generation amount is equal to or greater than the total power consumption amount (power consumption amount), a charge instruction or standby instruction is issued to the storage battery H40 set to the first mode.

With such a configuration, when the total power generation amount is surplus with respect to the total power consumption amount, the storage battery H40 can be controlled based on the surplus power amount.

Further, in the power supply system 1,
The EMS 60 (control unit)
determining the number of the storage batteries H40 to be charged based on the difference between the total power generation amount and the total power consumption (power consumption) and the maximum charging amount of the storage battery;
determining the storage battery H40 to be charged from among the storage batteries H40 set to the first mode based on the number of the storage batteries H40 to be charged;
Of the storage batteries H40 set to the first mode, the standby instruction is given to the storage batteries H40 to which the charging instruction is not given.

With such a configuration, based on the number of storage batteries H40 to be charged (requested number of charging) and the number of storage batteries H40 that can actually be charged (chargeable number), which are determined according to the total surplus power amount. The storage battery H40 for which the charge instruction is to be issued and the storage battery H40 for which the standby instruction is to be issued can be determined.

Further, in the power supply system 1,
The EMS 60 (control unit)
setting a charging priority for the storage battery H40 set to the first mode;
Based on the charging priority, the storage battery H40 to which the charging instruction is to be issued is determined.

With such a configuration, it is possible to suppress unevenness in the amount of remaining power in each storage battery.

Further, in the power supply system 1,
The EMS 60 (control unit)
A second mode for controlling charging and discharging based on the power flowing between the system power source S and the load H10 can be set for the storage battery H40,
Among the plurality of storage batteries H40, at least one storage battery H40 is set to the second mode, and the remaining storage batteries H40 are set to the first mode.

With such a configuration, it is possible to cope with sudden changes in the total power generation amount and the total power consumption amount. That is, when the total power generation amount and the discharge amount of the storage battery H40 for which the discharge instruction is issued are insufficient for the total power consumption due to a sudden change in the total power generation amount and the total power consumption amount, the second mode is set. The above-described shortage of electric power can be quickly discharged by the storage battery H40. Thereby, power purchase from the system power source S can be suppressed.

Further, in the power supply system 1,
The EMS 60 (control unit)
The second mode is set for the most upstream storage battery H40 connected to the system power supply S side most among the plurality of storage batteries H40.

With such a configuration, it is possible to secure electric power in the most upstream storage battery H40 in order to deal with sudden changes in the total amount of power generation and the total amount of power consumption.

Note that the solar power generation unit H30 according to the present embodiment is an embodiment of the power generation unit.
Moreover, EMS60 which concerns on this embodiment is one form of implementation of a control part.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above configurations, and various modifications are possible within the scope of the invention described in the claims.

For example, in the present embodiment, the electric power purchased in bulk by the electric power retailer from the electric power company is appropriately supplied (accommodated) among the plurality of residences H. No need.

Further, the EMS 60 may be configured by, for example, a home server (not shown), a control unit of a storage battery, an HEMS provided in a house (when the application target of the power supply system 1 is a house), or the like.

Moreover, although the power generation unit uses sunlight as natural energy, it may use water power, wind power, tidal power, or the like, or may not use natural energy.

In addition, in the present embodiment, when the charge/discharge control process is executed, the first mode is set for the three storage batteries H40. may be set. Also, the first mode may be set for the storage batteries H40 of all the houses H.

Further, in this embodiment, when executing the charge/discharge control process, an example is shown in which the second mode is set for the most upstream storage battery H40 installed in the house H (the first house H1) in the residential block T. However, the storage battery H40 (the most upstream storage battery H40) for which the second mode is set is not limited to the one installed in the house H. For example, the most upstream storage battery H40 may be installed in a shared facility such as a meeting place in the residential block T.

In addition, in the present embodiment, when the charge/discharge control process is executed, the number of storage batteries H40 for which the second mode is set is one, but the number of storage batteries H40 for which the second mode is set is not limited to one. , a plurality of storage batteries H40 may be set to the second mode. In this case, among the plurality of storage batteries H40, an appropriate number of storage batteries H40 may be set to the second mode in order from the ones arranged on the upstream side.

1 power supply system 60 EMS
H10 Load H30 Photovoltaic power generation unit H40 Storage battery S System power supply

Claims (7)

a plurality of storage batteries connected in series between a system power supply and a load, capable of being charged with power and capable of supplying power to the load by discharging the charged power;
a plurality of power generation units connected to the storage battery and circulating generated power between the system power supply and the load;
a control unit capable of controlling charging and discharging of the plurality of storage batteries;
A power supply system comprising
The control unit
A first mode for controlling charging and discharging based on instructions from the control unit can be set for the storage battery,
charging and discharging of the storage battery set to the first mode is controlled based on the result of comparing the total amount of power generated by summing the amount of power generated by the plurality of power generation units and the amount of power consumed by the load; ,
when the total amount of power generation is smaller than the amount of power consumption, issuing a discharge instruction or a standby instruction to the storage battery set to the first mode;
determining the number of the storage batteries to be discharged based on the difference between the power consumption and the total power generation and the maximum discharge amount of the storage battery;
determining, based on the number of the storage batteries to be discharged, a storage battery for which a discharge instruction is to be given, from among storage batteries that can be discharged among the storage batteries set to the first mode;
Of the storage batteries set to the first mode, a standby instruction is given to a storage battery that does not give a discharge instruction.
power supply system. The control unit
setting a discharge priority for the storage battery set to the first mode;
Determining a storage battery for which a discharge instruction is to be given based on the discharge priority order;
The power supply system according to claim 1. The control unit
If the total amount of power generation is equal to or greater than the amount of power consumption, issue a charge instruction or a standby instruction to the storage battery set to the first mode;
The power supply system according to claim 1 or 2 . a plurality of storage batteries connected in series between a system power supply and a load, capable of being charged with power and capable of supplying power to the load by discharging the charged power;
a plurality of power generation units connected to the storage battery and circulating generated power between the system power supply and the load;
a control unit capable of controlling charging and discharging of the plurality of storage batteries;
A power supply system comprising
The control unit
A first mode for controlling charging and discharging based on instructions from the control unit can be set for the storage battery,
charging and discharging of the storage battery set to the first mode is controlled based on the result of comparing the total amount of power generated by summing the amount of power generated by the plurality of power generation units and the amount of power consumed by the load; ,
when the total amount of power generation is equal to or greater than the amount of power consumption, issuing a charge instruction or a standby instruction to the storage battery set to the first mode;
determining the number of the storage batteries to be charged based on the difference between the total power generation amount and the power consumption amount and the maximum charge amount of the storage battery;
Based on the number of the storage batteries to be charged, among the storage batteries set to the first mode, determine a storage battery for which a charging instruction is to be given,
Of the storage batteries set to the first mode, a standby instruction is given to a storage battery for which no charge instruction is given;
power supply system. The control unit
setting a charging priority for the storage battery set to the first mode;
determining a storage battery for which a charging instruction is to be given based on the charging priority;
The power supply system according to claim 4 . The control unit
The storage battery can be set to a second mode for controlling charging and discharging based on the power flowing between the system power supply and the load,
setting the second mode for at least one storage battery among the plurality of storage batteries, and setting the first mode for the remaining storage batteries;
The power supply system according to any one of claims 1 to 5 . The control unit
setting the second mode for the most upstream storage battery connected to the system power supply side most among the plurality of storage batteries;
The power supply system according to claim 6.

Images