JP5782233B2 - Energy management system and energy management method - Google Patents

Description

  The present invention relates to an energy management system and an energy management method, and more particularly, to an energy management system and an energy management method for controlling a method of using power by using a power generation system and a power storage system using natural energy.

  In recent years, with increasing interest in environmental issues, securing alternative energy and using clean energy have been promoted. As the use of clean energy, the spread of power generation systems that use natural energy such as sunlight, hydropower, wind power, and geothermal heat has become widespread, and its introduction is not limited to special equipment, but is actively introduced to buildings such as ordinary houses. Is underway.

  When a power generation system using natural energy is introduced into a building, the power generated by the power generation facility is connected to power supplied from a commercial power (power received from a power company) system and supplied to a load. Since the operation of the power generation system using natural energy is a planned operation according to the amount of natural energy generated, surplus power is generated when the amount of power generated by natural energy exceeds the amount of power consumed in the building. This surplus power can be reversed to the grid power side, that is, sold to the power company. As such a power generation system using natural energy, the use of a solar power generation system using a solar power site is particularly widespread.

  In addition, in order to effectively use nighttime power that is cheaper than daytime power, a power storage system using a storage battery is also introduced into a building such as a general house. The power storage system is connected to the commercial power system, stores cheap nighttime power in the storage battery at night when power consumption is low, and discharges the power of the storage battery during the daytime power period and supplies it to the load. It is possible to improve the efficiency of power use and reduce the electricity charge.

  Furthermore, facilities for utilizing energy with high economic effects, which are provided with a power saving system and a power generation system using natural energy, such as a solar power generation system, are also used. However, since the commonly used solar power generation system operates independently, if surplus power is generated, all the surplus power is sold and the power is maximized. It is hard to say that it is used effectively.

  Therefore, in a power generation facility that is equipped with a solar battery and a storage battery and can charge the storage battery with the power generated by the solar battery, if the power supplied from the power system is less than or equal to the contract power, the power generated by the solar battery To the load or charge the storage battery preferentially to supply the surplus power to the load, and the load is discharged from the storage battery only when the power supplied from the power system exceeds the contract power. There has been proposed a technique for effectively using the storage battery capacity by supplying power to the battery (see, for example, Patent Document 1).

  In addition, even when there is a power demand exceeding the output capacity from the load in a time zone other than the night charge application time zone, the power stored in the storage battery is used up and the night power is used effectively. At the same time, a technique for suppressing the use of daytime power has been proposed (see, for example, Patent Document 2).

JP-A-10-2011129 Japanese Patent No. 3759151

  However, in the techniques described in Patent Documents 1 and 2, the power generated by the solar battery and the power stored in the storage battery can be used effectively in the building, but the user (power generation / electric power of a resident of a house, etc.) Based on the judgment of the user of the saving system, the method of using the generated power and the stored power could not be selected. In other words, even if you want to prioritize the sale of surplus power according to the user's lifestyle and economic situation, or if you want to prioritize private power generation / consumption, the user will not be able to decide how to use power on their own. Relied on automatic control. As a result, optimal power control based on the user's lifestyle has not been performed. In addition, it has not been possible to perform optimal system linkage and control for reducing the environmental load and economic benefits of the user.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an energy management system and an energy management using a power generation system and an electric power storage system that can perform optimal power control based on a user's lifestyle. It is to provide a method.
Another object of the present invention is to provide an energy management system and an energy management method using a power generation system and an electric power storage system capable of controlling electric power so that the user can give and receive economic merits while reducing environmental loads. There is.

According to the energy management system of the present invention, the problem is that a power generation unit that generates power using natural energy, a power storage unit capable of storing power supplied from at least one of a commercial power system and the power generation unit, An energy management system capable of supplying power from a power source to a load, a power storage unit control unit for controlling charge / discharge of the power storage unit, and an operation mode selection unit for selecting an operation mode for determining a priority of power supplied to the load; The charge / discharge control means for transmitting a signal relating to charge / discharge to the power storage means control section when the operation mode is selected by the operation mode selection means, and the power including at least the amount of power sold, the amount of power generation, and the amount of power consumption and power information storage unit for storing history information, the power test for detecting at least power consumption in power generation and the load of the generator means And means, wherein the operation mode selection means, the discharge power of the power storage unit, generated power of the generator means, the power selling priority mode for supplying power to a load in the order of the system power of the electric power system, the generator It is possible to select any one of the operation modes selected from the local production / local consumption mode in which power is supplied to the load in the order of the generated power of the means, the discharge power of the power storage means, and the grid power of the power system. means displayable der the performance of a predetermined period unit of the power information from the power information stored in the power information storage unit is, the charge and discharge control means, the said power generation amount detected by the power detection means When the local energy production / consumption mode is selected by the operation mode selection means, the power generation amount is compared with the power consumption amount, and the power generation amount is equal to or greater than the power consumption amount. In A charge signal is transmitted to the power storage means control unit, the power storage means control unit controls the power storage means to charge based on the charge signal, and a local production / local consumption mode is selected by the operation mode selection means It is solved by controlling not to charge the electric power from the electric power system .

In the above structure, before Symbol operation mode selection means, it is preferable that to accept the input of the operation mode by the user.

According to such a configuration, since it is possible to select the priority (operation mode) of the power supplied to the load by the user, depending on the lifestyle including the user's sense of values and life and the economic situation Therefore, it is possible to select whether to give priority to selling surplus power or to give priority to private power generation / consumption, and it is possible to determine how to use the power by itself. Accordingly, optimal power control based on the user's lifestyle can be performed. Furthermore, by displaying the results of a predetermined period such as the amount of electricity sold, the amount of power generation, the amount of power consumption, for example, the history of the results of a day unit or the results of a month, You can save electricity and operate this system in the optimal operation mode.

The front KiTakashi discharge control means, in the case of and the predetermined time period when the power sale priority mode is selected by the operation mode selecting means, transmits a discharge signal to said storage means control unit, said storage means control The unit is preferably controlled to discharge the power storage means based on the discharge signal.

  As described above, in the power sale priority mode, since the power storage means is controlled to discharge in a predetermined time zone, the discharge of the power storage means is preferentially supplied to the load, and the load is discharged by the discharge of the power storage means. While all the power consumption can be supplied, all the power generated by the power generation means can be sold to the commercial power system.

In the case of local consumption mode, when the power generation amount of the power generation means is equal to or greater than the power consumption of the load, since the storage means is controlled so as to charge to charge the first power storage unit surplus power When the generated power is not supplied, it is possible to discharge the power from the power storage means and supply the power to the load, and it is possible to minimize the purchase of commercial power. Furthermore, in the case of the local production for local consumption mode, it is possible to minimize the purchase of commercial grid power by controlling the power storage means not to charge the power storage means.

At this time, before KiTakashi discharge control means, wherein when the power generation amount is smaller than the power consumption transmits discharge signals and the necessary discharge amount to said storage means control unit, said storage means control unit, the It is preferable to control the power storage means to discharge based on a discharge signal and a necessary discharge amount.

  By controlling in this way, when the power generation amount is smaller than the power consumption amount in the local production for local consumption mode, the shortage of the power generation amount with respect to the power consumption amount can be discharged from the power storage means as a necessary discharge amount. As a result, since all the generated power of the power generation means is supplied to the load and the shortage is supplied from the power storage means to the load, it is possible to minimize the purchase of commercial power.

In addition, according to the energy management method of the present invention, the subject is an energy management method using the energy management system described above , wherein the operation mode selection means includes the power sale priority mode and the local production for local consumption. An operation mode selection step of selecting any one of the operation modes and transmitting the selected operation mode to the charge / discharge control means , and the charge / discharge control means comprises the power generation amount of the power generation means and the consumption of the load. The power amount obtaining step for obtaining the power amount and the charge / discharge control means compare the power generation amount and the power consumption amount when the operation mode received from the operation mode selection means is the local production for local consumption mode. Te, wherein if the power generation amount is equal to or larger than the power consumption for transmitting a charging signal as a signal relating to charge and discharge the accumulator unit controller charging and discharging Signal transmission step, said storage means control unit, the charge and discharge control means based on the signal related to the charge and discharge received from have line control of charging and discharging of the accumulator unit, and local consumption mode by the operation mode selecting means There a row cormorants step control so as not to charge electric power from the electric power system when it is selected, the charge and discharge control means, said from the the operation mode selecting means, the power information stored in the power information storage unit And a step of displaying a result of power information in a predetermined period unit.

In this case, the pre-SL operation mode selecting step, it is preferable to perform the selection of the operation mode receives an input of the operation mode by the user.
With such a configuration, optimal power control based on the user's lifestyle can be performed.

The front in KiTakashi discharge signal transmitting step, when and for a predetermined time period when the power sale priority mode is selected by the operation mode selecting means, it is preferable to send a discharge signal.
As described above, in the power sale priority mode, the discharge of the power storage means is preferentially supplied to the load during a predetermined time period, and while the power consumption of the load can be all supplied by the discharge of the power storage means, All the generated power can be sold to the commercial power system.

The front KiTakashi discharge control means is connected to the center server through an electric communication line, the power sale amount, the power generation amount, the power information transmitted to the center server including power consumption, the based on the power information the optimal operation mode as a result of the center server is analyzed it is preferable to output received from the center server.

  By such control, in the case of the local production for local consumption mode, the generated power of the power generation means and the discharge power of the power storage means are preferentially supplied to the load, and the surplus power is preferentially charged to the power storage means. It is possible to minimize the purchase of commercial grid power and to effectively use the generated power of the power generation means and the stored power of the power storage means.

  According to the energy management system and the energy management method of the present invention, the optimal power control based on the lifestyle including the user's values and the life view, that is, the energy utilization method, using the power generation system and the power storage system. Control can be performed. In addition, it is possible to perform power control so as to reduce the environmental load and allow the user to exchange economic merits.

1 is an overall configuration diagram of an energy management system according to an embodiment of the present invention. 1 is an overall configuration diagram of an energy management system. It is a hardware block diagram of a home server. It is a flowchart of the charging / discharging control process of a storage battery. It is a flowchart of the charging / discharging control process of a storage battery. It is a graph which shows transition of electric energy. It is a graph which shows transition of electric energy.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It should be noted that the system configuration, hardware configuration, processing flow, and the like described below are not intended to limit the present invention, and can be variously modified within the scope of the present invention.
In this specification, a user is a user of the energy management system of the present invention, and in the embodiment described below, is a resident of a house.

  FIGS. 1 to 7 show an embodiment of an energy management system according to the present invention, FIGS. 1 and 2 are overall configuration diagrams of the energy management system, FIG. 3 is a hardware configuration diagram of a home server, and FIGS. FIG. 6 and FIG. 7 are graphs showing the transition of electric energy.

An energy management system S (hereinafter referred to as “energy management system S”) using the power generation system and the power storage system according to the present embodiment includes a solar power generation system 1 (power generation system), as shown in FIGS. 1 and 2. , Storage battery system 2 (power storage system), home server 3 as charge / discharge control means, monitor 4 as operation mode selection means, CT sensors 5 and 15 as power detection means, distribution board 6; It is comprised including.
In the present embodiment, the energy management system S is illustrated as being installed in a detached house. However, the energy management system S may be provided in an apartment house such as a condominium, an apartment, or a dormitory for group members. Moreover, you may install in buildings, such as not only a house but a building, a factory, a store.

The solar power generation system 1 includes a solar cell (solar cell module) 10 as a power generation means, a power conditioner (PCS) 11 for solar cells, and the like. The generated power is supplied to the load 7 in the building.
In the present embodiment, the solar power generation system 1 is used as the power generation means, but other power generation systems using natural energy, for example, a wind power generation system, a hydropower generation system, and the like can also be used.

  The solar cell power conditioner 11 mainly includes a booster circuit 12, a DC-AC inverter 13 that converts DC power generated by the solar cell 10 into AC power, an interconnection protection device 14, and the like. The generated power is converted into AC power and sent to a distribution line in the building to supply power to the load 7 in the building. In addition, the solar cell power conditioner 11 has a reverse power flow function that reversely flows the power generated by the solar cell 10 to the power system. If surplus power is generated, the power conditioner 11 is sold back to the power company distribution line. Electricity. The solar cell power conditioner 11 supplies a voltage to the grid by a potential difference between the grid voltage and the inverter output voltage.

  The storage battery system 2 includes a storage battery 20 as a storage unit, a control unit 21 as a storage unit control unit that performs charge / discharge control of the storage battery 20, a communication interface 22, a storage battery power conditioner (PCS) 25, and the like. The power generated by the photovoltaic power generation system 1 and the power supplied from the commercial power system are charged and stored, or the stored power is discharged and supplied to the load 7 in the building.

  The control unit 21 is a power storage unit control unit in the present embodiment, and detects the remaining amount of power stored in the storage battery 20, or charges the storage battery 20 based on the detected remaining power stored and a charge / discharge signal from the home server 3 described later. Perform discharge operation control. The control unit 21 also has a timer function for measuring time. The communication interface 22 performs connection control and data transmission / reception between the control unit 21 and the home network 100. In the present embodiment, the storage battery 20, the control unit 21, and the communication interface 22 are all housed in the storage battery cabinet.

  The storage battery power conditioner 25 mainly includes a bidirectional inverter 26, a booster circuit (not shown), a connection protection device, and the like. The bidirectional inverter 26 converts AC power supplied from a power system via a power receiving point (not shown) or power supplied from the solar battery 10 into DC power and stores it in the storage battery 20 or discharges the storage battery 20. The direct current power to be converted into alternating current power is discharged and supplied to the load 7 in the building.

  The home server 3 serving as the charge / discharge control means of this embodiment is a home gateway, and performs address conversion and data across different protocols of each electrical device connected to the home network 100 (broken line in FIGS. 1 and 2). The communication between devices is made possible, and the home network 100 and the Internet 102 are connected. The home server 3 further has a server function for controlling each electrical device connected to the home network 100, authenticating when accessing the home network 100 from the Internet 102, and storing information and web data acquired from each device. Has a storage function. The home server 3 is connected to a center server 110 such as a building manufacturer via the Internet 102.

  The home network 100 (broken lines in FIGS. 1 and 2) includes a home server 3 and electrical equipment in a house, for example, PC equipment such as a personal computer and a printer, AV equipment such as a television and a DVD / HDD recorder, a telephone and a fax machine. This is a home LAN in which telephone devices such as air conditioners and microwave ovens are connected by wired or wireless LAN. In the present embodiment, at least the home server 3, the monitor 4, the CT sensors 5 and 15, and the storage battery 20 (more specifically, the communication interface 22 for the storage battery 20) are connected via the home network 100. Yes.

FIG. 3 shows a hardware configuration of the home server 3.
The home server 3 is a CPU 31 as a processing device for performing various arithmetic and control processes, a ROM 32, a RAM 33, and an HDD 34 as storage devices for storing various databases and programs, and input / output control of information between the home server 3 and the outside. And an input / output interface 35 for performing the above.

  The CPU 31 is an arithmetic processing unit that performs control and arithmetic processing of processes executed by various programs. For example, when the CPU 31 receives information about the operation mode selected by the monitor 4 dedicated to the energy management system S as an operation mode selection unit, which will be described later, via the input / output interface 35, the storage battery according to the received operation mode. A process of transmitting a charge / discharge signal is executed for 20. Details of the process will be described later.

  The ROM 32 is a storage device for storing input / output control programs and the like, and the RAM 33 is a storage device for temporarily storing data and programs necessary for program execution. The HDD 34 includes various programs including a program for performing control processing when the operation mode is selected by the user, display processing on the monitor 4 such as the amount of electric power sold and the amount of power generation, and various types of programs necessary for executing the various programs. Remember the database. As various databases, for example, power information data for storing a history of power sales, power generation, and power consumption is stored.

  The input / output interface 35 inputs / outputs information between the home server 3 and the outside via the home network 100 and the Internet 102. For example, information regarding the operation mode selected by the monitor 4 and power information such as the power consumption and power generation measured by the CT sensors 5 and 15 are input to the home server 3. In addition, the CPU 31 outputs a control signal for a charge / discharge signal issued to the storage battery 20.

  The monitor 4 as the operation mode selection means is a monitor dedicated to the energy management system S using a touch panel display in this embodiment. The user switches the monitor 4 to the operation mode selection display, and touches the operation mode to be selected from the displayed operation modes, thereby performing selection input of the operation mode of the energy management system S. The monitor 4 accepts the selection of the operation mode and transmits information regarding the selected operation mode to the home server 3 via the home network 100.

  The energy management system S of the present invention is characterized in that the user can select how to operate the generated power of the solar power generation system 1 according to the lifestyle. In the present embodiment, as the operation mode, a mode in which power sale of the generated power of the solar power generation system 1 is prioritized (hereinafter referred to as “power sale priority mode”), and a load of the generated power of the solar power generation system 1 are applied. Two modes, modes giving priority to supply (hereinafter referred to as “local production / local consumption mode”), can be selected. Then, using the home server 3 as charge / discharge control means, the generated power of the photovoltaic power generation system 1, the discharged power of the storage battery system 2, and the system power are supplied to the load according to the selected operation mode. Control for.

  In the present embodiment, the priority of the power supplied to the load when the power sale priority mode is selected is (1) discharge power of the storage battery 20, (2) generated power of the solar battery 10, and (3) grid power. It is said. That is, when the storage battery 20 has a remaining storage capacity, the discharge power of the storage battery system 2 is supplied. When the discharge output of the storage battery 20 is insufficient, the generated power of the solar power generation system 1 is supplied. Supplies grid power. By supplying power to the load in such a priority order, when the remaining amount of power stored in the storage battery 20 is larger than the amount of power consumed by the load, all the generated power of the solar battery 10 becomes surplus power. Further, even when the remaining amount of electricity stored in the storage battery 20 is less than the power consumption amount of the load, if the power generation amount of the solar cell 10 is larger than the insufficient power consumption amount, the power supplied from the solar cell 10 to the load The remaining power becomes surplus power. This surplus power is sold to the grid by the reverse power flow function of the solar cell power conditioner 11 when the power sale priority mode is selected.

  Moreover, in this embodiment, the priority of the power supplied to the load when the local production / local consumption mode is selected is as follows: (1) generated power of the solar battery 10, (2) discharged power of the storage battery 20, and (3) grid power. It is said. That is, when the solar battery 10 is generating power, the generated power of the solar power generation system 1 is supplied. When the generated power of the solar battery 10 is insufficient, the discharge of the storage battery system 2 is supplied. Supplies grid power. Further, as will be described later, when the local production for local consumption mode is selected, when the power generation amount of the solar cell 10 is larger than the power consumption amount of the load, control is performed so as to charge the storage battery 20 with the surplus power. By supplying power to the load in priority order, surplus power is first charged in the storage battery 20 and then sold to the grid.

  In addition, the monitor 4 displays the current power generation amount, power sales amount, power purchase amount, power consumption amount, remaining power storage amount of the storage battery 20, the status of “buying power” and “under power sale”, and the like. It is possible to confirm this information. Furthermore, it is also possible to display a history such as daily performance and monthly performance related to these electric energy levels, so that people can save electricity while checking the actual power consumption such as power generation and consumption. The system can be operated in an optimal operation mode.

  In this embodiment, a dedicated monitor 4 using a touch panel display is provided as the operation mode selection means. However, a personal computer equipped with an input device such as a keyboard or a mouse used in the home, a web It is also possible to use a TV, a mobile phone or the like having a browser function. In this case, the home server 3 and each device are connected via the home network 100, and a module for realizing a display / input function dedicated to the present system is installed on each device side. The amount can be displayed.

Furthermore, in this embodiment, CT sensors (current detectors) 5 and 15 are provided as power detection means. The CT sensor 5 is provided on a distribution line between the distribution board 6 and the load 7, and detects the power consumption (current value) of the load 7. The CT sensor 15 is provided on the distribution line of the solar cell power conditioner 11 and detects the amount of electric power (current value) supplied from the solar power generation system 1. These CT sensors 5 and 15 are connected to the home server 3 via the home network 100, and the home server 3 is configured to be able to acquire the amount of power detected by the CT sensors 5 and 15.
In the present embodiment, each of the CT sensor 5 for measuring the power consumption amount of the load and the CT sensor 15 for measuring the power generation amount of the solar battery 10 are connected to the home server 3, and the home server 3 has the respective power. Although it is configured to acquire the quantity, a measuring instrument that collects and accumulates information of each CT sensor 5, 15 is separately provided and connected to the home server 3, and the home server 3 collects information from the measuring instrument in a lump. You may comprise so that it may obtain.

  The distribution board 6 has a power use circuit for supplying system power to a building lamp or an outlet, and connects the distribution line to each load 7 through a breaker. Each load 7 is, for example, an electric device such as an electric light, a shared outlet, and an electric vehicle power supply device.

  Furthermore, in the energy management system S of the present embodiment, the home server 3 is connected to the center server 110 such as a building manufacturer via the Internet 102. The center server 110 collects and analyzes information on the power generation amount and usage status of each house from the home server 3, creates a diagnosis report, and proposes an optimal operation mode, power saving method, and the like for the user. it can.

Next, control of power supply to the load by the energy management system S will be described.
When the user selects an operation mode on the monitor 4, information (operation mode information) regarding the selected operation mode is transmitted from the monitor 4 to the home server 3. The CPU 31 of the home server 3 stores the received operation mode information in the HDD 34 as operation mode storage means.

The CPU 31 of the home server 3 performs a charge / discharge control process for controlling the charge / discharge of the storage battery 20. A processing flow of the charge / discharge control processing by the CPU 31 will be described with reference to FIGS. 4 and 5. The charge / discharge control process is repeatedly executed by the CPU 31 at all times.
CPU31 acquires the power consumption of the whole load from CT sensor 5 provided in the load side (Step S1), and acquires the electric power generation amount of solar cell 10 from CT sensor 15 provided in the solar cell 10 side (Step S1). Step S2). Next, the operation mode information memorize | stored with reference to HDD34 is acquired (step S3), and the selected operation mode is determined (step S4). If the selected operation mode is the power sale priority mode (step S4; power sale priority), it is determined whether or not it is a nighttime power time zone (step S5). When it is a nighttime electric power time slot | zone (step S5; Yes), a charge signal is transmitted to the control part 21 of the storage battery system 2 (step S6). On the other hand, when it is not the nighttime power time zone, that is, during the daytime power time zone (step S5; No), a discharge signal is transmitted to the control unit 21 (step S6), and the process ends.

  When the selected operation mode is the local production for local consumption mode (step S4; local production for local consumption), the power generation amount of the solar cell 10 and the power consumption amount of the load are compared (step S11). When the power generation amount of the solar battery 10 is equal to or exceeds the power consumption amount of the load (step S11; Yes), it is determined whether or not the storage battery 20 needs to be charged, that is, whether or not the storage battery 20 is fully charged ( If not fully charged (step S12; No), a charge signal is transmitted to the control unit 21 of the storage battery system 2 (step S13), and the process ends. When the storage battery 20 is fully charged (step S12; Yes), since the storage battery 20 is controlled not to accept charging by the control function of the storage battery 20, the home server 3 ends this process without performing any particular process.

  On the other hand, when the power consumption amount of the load exceeds the power generation amount of the solar cell 10 (step S11; No), the shortage power amount, that is, the difference between the power consumption amount and the power generation amount is calculated (step S14). A quantity and a discharge signal are transmitted to the control part 21 of the storage battery system 2 (step S15), and a process is complete | finished. This insufficient power amount is the amount of power that needs to be supplied from the storage battery 20 to the load, that is, the required discharge amount.

  The control unit 21 of the storage battery system 2 performs charge / discharge of the storage battery 20 based on the charge / discharge signal and the necessary discharge amount transmitted from the home server 3 in the charge / discharge control process. When the necessary discharge amount is transmitted, control is performed so that only the necessary amount is discharged based on the value.

Next, load supply power in each operation mode will be described.
In the energy management system S of the present invention, when the control is based on the difference in voltage, that is, when the electrical equipment is linked to the grid, the grid is linked so as to naturally control the flow of electricity in consideration of the voltage difference. Yes. Specifically, with respect to the length of the cable between each of the storage battery system 2, the photovoltaic power generation system 1, and the power system and the load, the storage battery system 2 in order of decreasing cable length (small distance from the load). , Photovoltaic power generation system 1, grid-connected so as to be an electric power system. With such a configuration, when all of these are connected, the supply of power to the load side is performed in the order of the discharge power of the storage battery system 2, the generated power of the solar power generation system 1, and the system power. Is called.

  Further, as will be described later, the control of the CPU 31 of the home server 3 and the control unit 21 of the storage battery system 2 removes the insufficient power from the storage battery 20 based on the power consumption amount of the load and the power generation amount of the solar power generation system 1. It has a function of automatically adjusting charging / discharging of the storage battery 20 so as to be supplied to the load.

1. When “power sale priority mode” is selected and the photovoltaic power generation system 1 is generating power.
In the daytime power time zone in the power sale priority mode, the discharge signal is transmitted from the home server 3 to the control unit 21 of the storage battery system 2 in the charge / discharge control process as described above. Control part 21 of storage battery system 2 which received the discharge signal sends a control signal to storage battery 20 so that it may always discharge. Therefore, when there is a remaining amount of electricity stored in the storage battery 20, discharging is performed.

With this power control, power is supplied to the loads in the building as follows.
(1) Since a discharge signal is transmitted from the home server 3 to the control unit 21 of the storage battery system 2, output control from the storage battery 20 is performed by the control unit 21, and power consumption requiring a load is first discharged from the storage battery 20. And supplied to the load.
(2) When the discharge output of the storage battery system 2 is insufficient, the generated power of the solar power generation system 1 is supplied.
(3) If the generated power of the solar power generation system 1 is insufficient, the system power from the commercial power system is supplied.

  In this power control, when the remaining amount of power stored in the storage battery 20 is larger than the amount of power consumed by the load, all the generated power of the solar battery 10 becomes surplus power. Further, even when the remaining amount of electricity stored in the storage battery 20 is less than the power consumption amount of the load, if the power generation amount of the solar cell 10 is larger than the insufficient power consumption amount, the power supplied from the solar cell 10 to the load The remaining power becomes surplus power. This surplus power is sold to the grid by the reverse power flow function of the solar cell power conditioner 11 when the power sale priority mode is selected.

2. When “power sale priority mode” is selected and the solar power generation system 1 is not generating power during the daytime power hours.
In the daytime power time zone in the power sale priority mode, the storage battery 20 is controlled to be always discharged by the discharge signal from the home server 3 as in the case of the above pattern 1. Therefore, when the solar power generation system is not generating power during the daytime power hours, power is supplied to the load in the building as follows.
(1) Since the discharge signal is transmitted from the home server 3 to the control unit 21 of the storage battery system 2, when there is a remaining amount of power stored in the storage battery 20, the discharge power from the storage battery 20 is supplied to the load by the control of the control unit 21. Is done.
(2) When there is no remaining amount of electricity stored in the storage battery 20 or when the discharge output of the storage battery 20 is insufficient, system power from the commercial power system is supplied.

3. When “Power Sale Priority Mode” is selected and it is in the nighttime power hours.
In the power sale priority mode, the charge signal is transmitted from the home server 3 to the control unit 21 of the storage battery system 2 in the charge / discharge control process as described above. Accordingly, power is not supplied from the storage battery 20 to the load, and system power from the commercial power system is supplied to the load.

4). When “local production for local consumption mode” is selected and the photovoltaic power generation system 1 is generating power.
In the case of the local production for local consumption mode, the charge signal or the discharge signal and the required discharge amount are sent from the home server 3 to the control unit 21 of the storage battery system 2 in accordance with the power consumption and the power generation amount in the charge / discharge control process as described above. Has been sent. That is, when the power generation amount is equal to or exceeds the power consumption amount, a charging signal is transmitted, so that power supply from the storage battery 20 to the load is not performed, and only the generated power is supplied to the load. On the other hand, when the amount of power consumption exceeds the amount of power generation, a discharge signal and the required amount of discharge are transmitted, and only the power shortage of the generated power relative to the power consumption is supplied from the storage battery 20 to the load. Thus, all the generated power is supplied to the load.

With this power control, power is supplied to the loads in the building as follows.
(1) Power generated by the solar power generation system 1 is supplied.
(2) Since the discharge signal is transmitted from the home server 3 to the control unit 21 of the storage battery system 2 when the generated power of the solar power generation system 1 is insufficient, the discharge power from the storage battery 20 is supplied by the control of the control unit 21 Is done.
(3) When the discharge output of the storage battery 20 is added, the system power from the commercial power system is supplied if it is insufficient.
In this power control, when the power generation amount exceeds the power consumption amount, the storage battery 20 is controlled to be charged. Therefore, surplus power is first stored in the storage battery 20. If surplus power is generated even when the storage battery 20 is charged, the power is sold to the grid.

5). When “local production for local consumption mode” is selected and the photovoltaic power generation system 1 is not generating power.
When the solar power generation system 1 is not generating power in the local production for local consumption mode, the discharge signal is transmitted from the home server 3 to the control unit 21 of the storage battery system 2 in the charge / discharge control process as described above.
With this power control, power is supplied to the loads in the building as follows.
(1) Discharge power from the storage battery 20 is supplied.
(2) When the discharge output of the storage battery 20 is insufficient, system power from the commercial power system is supplied.

The storage battery 20 is charged according to the operation mode.
Specifically, in the power sale priority mode, charging is performed from commercial power during the night power hours. The generated power of the solar battery 10 is not used for charging the storage battery 20 because priority is given to selling power to the grid power.
In the case of the local production for local consumption mode, the surplus power of the photovoltaic power generation system 1 is charged in the storage battery 20. In order to minimize the purchase of system power, the storage battery 20 is not charged from the system power.

  By controlling the discharge / charging of the storage battery 20 and controlling the power supply to the load as described above, it is possible to use the generated power of the solar battery 10 appropriate for each operation mode, and to use the storage battery 20. It becomes possible to supply power consumption to the load.

6 and 7 show examples of the transition of the electric energy when the energy management system S of the present invention is used. FIG. 6 shows the transition of the electric energy when the power sale priority mode is selected, and FIG. 7 shows the transition of the electric energy when the local production / local consumption mode is selected.
In addition, the living time in the figure is the morning / night time period other than the bedtime where the resident is at home. It is the largest time zone. The daytime is a time zone other than the living time in the daytime power time zone. Nighttime is the nighttime power hours.
Further, a represents the amount of power generated by the solar cell 10, b represents the amount of power consumed, and c represents the amount of power supplied from the commercial power system (system power amount).

FIG. 6 is a graph showing the amount of power when the power sale priority mode is selected. In the power sale priority mode, power supply to the load by discharging from the storage battery 20 is given the highest priority. Therefore, as long as the power consumption (b) can be supplied by the discharge power of the storage battery 20, all the generated power (a) is sold. The If the discharge power of the storage battery 20 is insufficient during the time period when the solar battery 10 is generating power, the generated power (a) is supplied to the load for use by the consumed power (b) and used as surplus power (ab). : A shaded portion A of the graph) is sold. During the time period when the solar cell 10 is not generating power, the power consumption (b) is supplied from the discharge power of the storage battery 20. That is, if the remaining amount of electricity stored in the storage battery 20 is sufficient, power consumption other than the night time zone (shaded portion C in the graph) is supplied from the storage battery 20. In any case, the final shortage is supplied from the commercial power system.
When the night power hours are reached, grid power (c) having a predetermined amount of power is supplied to the house. At this time, the storage battery 20 is charged from the system power under the control of the control unit 21 of the storage battery system 2 (cb: shaded portion D in the graph), and the power consumption (b) of the load is also supplied from the system power. The

FIG. 7 is a graph showing the amount of power when the local production for local consumption mode is selected. In the local production for local consumption mode, in the time zone in which the solar cell 10 is generating power, the generated power is supplied to the load with the highest priority (the shaded area A in the graph). The surplus power of the solar cell 10 generated power (ab: B portion without shading in the graph) is first charged in the storage battery 20, and if there is surplus power, it is sold. When the generated power of the solar cell 10 is less than the consumed power and when the solar power generation system 1 is not generating power, the storage battery 20 is discharged and power is supplied to the load (shaded portion C in the graph). . In any case, the final shortage is supplied from the commercial power system.
In the case of the local production for local consumption mode, it is not necessary to purchase grid power while the total power generation amount of the solar power generation system 1 exceeds the total power consumption amount.

  As described above, the energy management system S of the present invention is a hybrid system in which the photovoltaic power generation system 1 and the storage battery system 2 are combined, and a control system for the system. According to this energy management system S, it becomes possible for a user (user of the system) to control a method of using energy based on a lifestyle including his own values and a view of life. In addition, it is possible to provide an optimum energy management system and a system for controlling the energy management system that can reduce both the environmental load and the economic merit of the home.

  In addition, the energy management system S of the present invention links the hardware part (residential equipment) and the software part (induction to energy-saving life by controlling the operation mode) to comprehensively save energy and reduce CO2 emissions. It is a system that can achieve.

  In addition to the configuration described in the above embodiment, a system that collects environmental data in a building and proposes an appropriate driving method can be linked. For example, in addition to data related to power consumption / generated power detected by the CT sensors 5 and 15, other sensors are provided to collect environmental data in the building such as temperature, humidity, gas amount, water amount, etc. Analysis is performed, or the data is transmitted to the center server 110 via the home server 3, the center server 110 performs analysis, and the analysis result is transmitted to the home server 3 and presented to the user. By making such a proposal and making the confirmation of the energy consumption status and creation (power generation, etc.) status of the user “visible”, the user can be guided to an energy-saving lifestyle.

  Moreover, in the said embodiment, although two operation modes, the power sale priority mode and the local production for local consumption mode, were provided, you may provide the mode which designates charging / discharging of a storage battery other than that. In this case, while the charging mode is selected, the storage battery is charged from the surplus power of the solar battery or the system power to store the power. Further, while the discharge mode is selected, the storage battery is discharged, and the power is supplied to the load in preference to the generated power of the solar battery and the system power. By providing such a mode, power can be stored according to the user's intention, or power can be consumed with priority over stored power.

  Further, by linking home CGS (cogeneration system) using household gas, fuel cells, etc. with the configuration of the above embodiment, energy management can be performed with further energy saving and reduced environmental load.

S Energy management system 1 Photovoltaic power generation system 2 Storage battery system 3 Home server (charge / discharge control means)
4 Monitor (Operation mode selection means)
5,15 CT sensor (electric power detection means)
6 Distribution board 7 Load 10 Solar cell (power generation means)
DESCRIPTION OF SYMBOLS 11 Solar cell power conditioner 12 Booster circuit 13 DC-AC inverter 14 Connection protection device 20 Storage battery (electric storage means)
21 Control unit (power storage means control unit)
22 Communication Interface 25 Storage Battery Power Conditioner 26 Bidirectional Inverter 31 CPU
32 ROM
33 RAM
34 HDD
35 I / O interface 100 Home network 102 Internet 110 Center server

Claims (8)

An energy management system capable of supplying power to a load from a power generation means for generating power using natural energy, a power storage means capable of storing power supplied from at least one of a commercial power system and the power generation means,
A power storage means controller for controlling charging and discharging of the power storage means;
An operation mode selection means for selecting an operation mode for determining the priority of power supplied to the load;
Charge / discharge control means for transmitting a signal relating to charge / discharge to the power storage means control section when the operation mode is selected by the operation mode selection means;
A power information storage means for storing a history of power information including at least a power sale amount, a power generation amount, and a power consumption amount;
Power detection means for detecting at least the power generation amount of the power generation means and the power consumption amount of the load ,
The operation mode selection means includes a power sale priority mode for supplying power to a load in the order of discharge power of the power storage means, power generated by the power generation means, and system power of the power system, power generated by the power generation means, It is possible to select one of the operation modes, the local production / local consumption mode for supplying power to the load in the order of the discharge power of the power storage means and the grid power of the power system,
The operation mode selecting means, Ri displayable der the performance of a predetermined period unit of the power information from the power information stored in the power information storage unit,
The charge / discharge control means acquires the power generation amount and the power consumption detected by the power detection means, and when the local production / local consumption mode is selected by the operation mode selection means, the power generation amount and the power consumption Compare power consumption amount, if the power generation amount is greater than or equal to the power consumption amount, send a charge signal to the power storage means control unit,
The power storage means control unit controls the power storage means to charge based on the charging signal, and does not charge the power from the power system when the local production / local consumption mode is selected by the operation mode selection means. An energy management system characterized by control .   The energy management system according to claim 1, wherein the operation mode selection unit receives an operation mode input by a user. The charge / discharge control means transmits a discharge signal to the power storage means control unit when the power sale priority mode is selected by the operation mode selection means and in a predetermined time zone,
The energy management system according to claim 1, wherein the power storage unit control unit controls the power storage unit to discharge based on the discharge signal. When the power generation amount is smaller than the power consumption amount, the charge / discharge control unit transmits a discharge signal and a necessary discharge amount to the power storage unit control unit,
2. The energy management system according to claim 1 , wherein the power storage unit control unit controls the power storage unit to discharge based on the discharge signal and a necessary discharge amount. An energy management method using the energy management system according to claim 1,
The operation mode selection means performs an operation mode selection step of selecting any one of the power sale priority mode and the local production / local consumption mode, and transmitting the selected operation mode to the charge / discharge control means,
The charge / discharge control means acquires a power generation amount of the power generation means and a power consumption amount of the load; and
When the operation mode received from the operation mode selection unit is the local production for local consumption mode, the charge / discharge control unit compares the power generation amount with the power consumption amount, and the power generation amount is equal to or greater than the power consumption amount. In this case, a charge / discharge signal transmission step of transmitting a charge signal as a signal related to charge / discharge to the power storage means control unit,
When the accumulator unit controller, the local consumption mode is selected by said have line control of charging and discharging of the charge and discharge the accumulator unit based on a signal related to the charge and discharge received from the control means, and said operation mode selecting means and line cormorant step control so as not to charge electric power from the electric power system, the
The charge / discharge control means comprises the step of causing the operation mode selection means to display a record of the power information in a predetermined period from the power information stored in the power information storage means. Management method. 6. The energy management method according to claim 5 , wherein, in the operation mode selection step, an operation mode is selected by receiving an operation mode input by a user. Wherein the charge and discharge signal transmission step, according to the case and the predetermined time period when the power sale priority mode is selected by the operation mode selecting means, to claim 5 or 6, characterized in that transmitting a discharge signal Energy management method. The charge / discharge control means is connected to a center server via a telecommunication line, transmits the power information including the amount of power sold, the amount of power generation, and the amount of power consumption to the center server, and the center server is based on the power information. energy management system according to any one of claims 1 to 4 for optimum operation modes as a result of analyzing and outputting received from the center server.

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