JP2016046829A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system that performs, according to a request from a power supply source, control so that a storage battery in a facility discharges power.SOLUTION: An MEMS aggregator, when the sum total of power supplied to a plurality of smart condominiums exceeds a first threshold that is a sum total limitation value, performs control so that managed storage batteries installed in the plurality of smart condominiums discharge power. The MEMS aggregator, when having received a power saving request, performs control so that the managed storage batteries installed in the plurality of smart condominiums discharge power. The MEMS aggregator, when power consumption in a smart condominium is equal to or lower than the first threshold and the power saving request has not been received, performs control so as to charge a storage battery until the battery is fully charged.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power supply system that controls the storage / discharge amount of a storage battery provided in a building.

  In recent years, there has been an increase in the introduction of a power supply system including a power source that is different from a commercial power system as a power supply system to a power system to which a load is connected. In such a power supply system including a separate power source, a part of the power consumption of the power system is limited by the power from the power source, and the supply of power from the commercial power system is reduced. In such a power supply system, a configuration is proposed that includes a storage battery that is charged at night when the power consumption of the load system is reduced and is discharged during the day.

  In the power supply system described in Patent Literature 1, a power threshold is set in advance in a facility equipped with a storage battery. When the power consumption in the facility exceeds a set threshold, the peak is cut by discharging from the shared storage battery so as not to drop the load in the facility.

JP 2013-143867 A

  In the control described in Patent Document 1, even if the power demand within the jurisdiction of the power company is tight and demands power saving, if the power consumption in the facility is low, the battery is not discharged and the peak cut is made There is a problem that can not contribute to.

  Accordingly, the present invention has been made in view of the above-described problems, and an object thereof is to provide a power supply system that controls a storage battery in a facility to be discharged in response to a request from a power supply source.

  The present invention employs the following technical means in order to achieve the aforementioned object.

  In the present invention, when the power consumption detected by the detection means becomes larger than the limit value smaller than the limit value of the supplied power, the storage battery is controlled to be discharged, and the power consumption in the building is the limit value. The power supply system is characterized in that the storage battery is controlled to be discharged when a power saving request, which is a request for reducing the power supplied to the building by the communication means, is received.

  According to the present invention as described above, when the power consumption detected by the detection means becomes larger than the limit value, the storage battery is controlled to be discharged. If the power consumption becomes larger than the limit value and remains as it is, there is a possibility that the power consumption will further increase and become the limit value of the supplied power. Therefore, the supply power can be reduced by controlling the storage battery to discharge. Therefore, it is possible to suppress the supply power from reaching the limit value.

  Further, when the power consumption in the building is equal to or less than the limit value and a power saving request is received by the communication means, the storage battery is controlled to be discharged. When the power consumption is less than or equal to the limit value, the storage battery is not discharged because the power consumption is low. However, even in such a case, the storage battery is controlled to discharge in response to a power saving request. As a result, the power supplied from the power supply source can be reduced. Therefore, it can contribute to peak cut.

  In addition, the code | symbol in the bracket | parenthesis of each above-mentioned means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

1 is a block diagram showing a simplified power supply system 10. FIG. It is a flowchart which shows the process of a MEMS aggregator. It is a graph for demonstrating a threshold value.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. The power supply system 10 is a system capable of supplying supply power supplied from a power supply source power system to an electric load connected to an AC power line L in a building based on a power supply contract. The building is an apartment house in which a plurality of doors are gathered, for example, a smart apartment 50. The smart condominium 50 has a dedicated unit 51 and a common unit 52 which are a plurality of doors, and electric power from the electric power company 60 which is an electric power system is supplied through a main distribution board 53 installed in the smart condominium 50. It has become so.

  The main distribution board 53 supplies power to the distribution board 14 of the exclusive part 51 and the distribution board 17 of the common part 52. A main breaker 21 is disposed on each of the main distribution board 53, the distribution board 14 of the exclusive section 51, and the distribution board 17. Electric power from the electric power company 60 is supplied to the main breaker 21 of the main distribution board 53 via a high-voltage power collective power receiving facility (hereinafter also referred to as “power receiving facility”) 61.

  Normally, ordinary households individually contract with the power company 60 to use low-voltage power. Similarly, in many condominiums, each household and the management association individually contract with the electric power company 60, and the electric power company 60 transforms the high-voltage power drawn into the condominium into a low voltage in the electric room in the apartment, and through the power meter of the exclusive section Supply.

  On the other hand, in the smart apartment 50 of this embodiment, the power receiving equipment 61 is provided between the electric power company 60 and the smart apartment 50. The power receiving facility 61 is a facility that provides power supply service, and purchases high-voltage power from the electric power company 60 and converts it to low-voltage using a substation installed in the smart apartment 50 to supply power to the main distribution board 53. Supply. In other words, in an apartment house such as the smart apartment 50, a high voltage power contract is made with the electric power company 60 in the entire apartment house, and a resident of the exclusive part 51 makes a low voltage contract with the power receiving equipment 61, thereby supplying electricity from the power receiving equipment 61. is recieving. Due to the difference between the high-voltage power unit price and the low piezoelectric lamp unit price, the electricity rate can be reduced. Therefore, the power receiving facility 61 receives a large amount of power from the power company 60 that is the power supply source and supplies power to the plurality of smart apartments 50.

  The power receiving facility 61 communicates with a MEMS (Mansion Energy Management System) aggregator 62 that manages a plurality of smart apartments 50. MEMS measures and accumulates power consumption, etc. used in the smart condominium 50, “visualizes” it at the installation site and remotely, controls connected devices such as air conditioning and lighting equipment, and controls and controls demand peaks It is an energy management system having a function to perform. The MEMS aggregator 62 is an energy use information management operator who introduces the MEMS into the apartment, installs a centralized management system by the MEMS cloud 63, etc., and provides an energy management support service to the auxiliary business. The MEMS aggregator 62 acquires the power consumption of each dedicated unit 51 via the MEMS cloud 63. Therefore, the MEMS aggregator 62 corresponds to a management device, and communicates with a plurality of buildings to manage power supplied to the plurality of smart apartments 50 and power consumption in the plurality of smart apartments 50.

  A main circuit breaker 21 and a power sensor unit 16 are disposed on the distribution board 14 of the exclusive part 51. The main breaker 21 is a breaker with a leakage detection function that regulates the upper limit value of the current flowing through the AC power line L.

  Further, in the distribution board 14, the AC power line L branches to the home load 13 and the HEMS monitor 32 that are electrical loads via the main breaker 21. As described above, the AC power line L is connected to the in-house load 13 of various electric devices and can supply power to the in-house load 13. The power sensor unit 16 detects the power in the distribution board 14 and transmits the detected power amount to the HEMS monitor 32.

  A main circuit breaker 21, a power sensor unit 16, and a current sensor 22 are disposed on the switchboard 17 of the common unit 52. The main breaker 21 is a breaker with a leakage detection function that regulates the upper limit value of the current flowing through the AC power line L. The main breaker 21 is connected to the solar power PCS of the solar power generator (PV) 12 and also functions as a breaker that regulates the upper limit value of the current flowing from the solar power PCS.

  The current sensor 22 is a current detection unit, and provides information regarding the detected current to the solar power generator 12. The solar power generator 12 calculates a current based on the information given from the current sensor 22 and gives the storage battery 33 information about the calculated current value.

  In the distribution board 14, the AC power line L is branched from the power storage unit 11, the shared load 18 that is an electric load, and the power sensor unit 16 via the main breaker 21. In this way, the AC power line L is connected to the shared load 18 such as the akiaki of the shared unit 52, an elevator, an automatic door, a centralized intercom, etc., so that the shared load 18 can be fed.

  Next, the solar power generator 12 will be described. The solar power generator 12 is a solar power generation means that generates power using sunlight, and supplies power outside the system to the AC power line L. The solar power generator 12 includes a solar panel and a solar PCS. The solar panel is provided on the roof of a building, for example, and generates power using sunlight. The solar panel supplies the generated solar power to the solar PCS. The solar PCS is electrically connected to the AC power line L via the main breaker 21, converts DC power from the solar panel into AC power, and discharges it to the AC power line L. Although not shown, the solar PCS is connected to a LAN (local area network) and configured to be able to communicate with each unit. In the present embodiment, the solar power generator 12 is provided in the shared unit 52, but power can be supplied from the switchboard 17 to the distribution board 14 of the exclusive unit 51 through the main distribution board 53. Therefore, the electric power consumed in the exclusive part 51 and the shared part 52 can be supplemented by solar power.

  Next, the power storage unit 11 will be described. The power storage unit 11 is installed, for example, outside the smart apartment 50 and is also called a power storage device, a power storage system, or an “e-Station”. The power storage unit 11 is electrically connected to the AC power line L. The power storage unit 11 includes a home energy management system (HEMS) monitor 32, a control ECU 31, and a storage battery 33.

  The storage battery 33 is a power storage means capable of storing and discharging electric power, and is an aggregate obtained by combining a plurality of unit batteries made of secondary batteries such as lithium ion batteries. Storage battery 33 has storage battery PCS inside, and is electrically connected in parallel to AC power line L via storage battery PCS.

  The storage battery PCS converts the AC power from the AC power line L into DC power and supplies it to the storage battery 33. The storage battery PCS converts the DC power from the storage battery 33 into AC power and discharges it to the AC power line L. Therefore, the storage battery 33 can charge the AC power from the AC power line L, or discharge the stored DC power to the AC power line L. As described above, the storage battery 33 can store the solar power generated by the solar power generator 12 and the supply power supplied from the power system, and can discharge the stored power to the AC power line L.

  The storage battery 33 is communicably connected to other devices by a storage battery monitoring ECU (not shown) mounted on the storage battery 33. The storage battery 33 is LAN-connected to the control ECU 31 and the HEMS monitor 32 and the like, and can exchange information (information transmission) with each other.

  The storage battery 33 also functions as a power storage control unit that controls charging and discharging. The power storage unit 11 includes a relay (not shown) therein, and can switch the connection state between the AC power line L and the storage battery 33 between the connection state and the disconnection state by switching the connection state of the relay. Therefore, when the AC power line L and the storage battery 33 are in a disconnected state, the discharge from the storage battery 33 to the AC power line L is stopped. In the present embodiment, the power storage unit 11 is provided in the shared unit 52, but power can be supplied from the switchboard 17 to the distribution board 14 of the exclusive unit 51 via the main distribution board 53. Therefore, the power consumed by the exclusive unit 51 and the shared unit 52 can be supplemented by the power of the storage battery 33.

  Next, the HEMS monitor 32 will be described. The HEMS monitor 32 functions as notifying means for displaying the state of each part and operating means for operating each part. The HEMS monitor 32 is, for example, remote operation means (so-called remote control) disposed in the exclusive unit 51 or centralized management unit disposed in the common unit 52. As described above, the HEMS monitor 32 is LAN-connected to each unit and can communicate with the external MEMS cloud 63. The HEMS monitor 32 includes a display unit corresponding to notification means and an operation switch for operating each unit. On the display unit of the HEMS monitor 32 of the exclusive unit 51, for example, the amount of power generated by the solar cell, the amount of power used by the home load 13, and the like are displayed. On the display unit of the HEMS monitor 32 of the shared unit 52, for example, the storage state of the storage battery 33, the power generation amount of the solar cell, the power generation state of the fuel cell 15, the amount of power used by the shared load 18 and the like are displayed. Further, by operating the operation switch, it is possible to instruct the storage battery 33 to store power and make various settings. Therefore, the HEMS monitor 32 also functions as setting means for making various settings. Further, the HEMS monitor 32 can acquire predetermined information by communicating with the MEMS cloud 63.

  Next, the control ECU 31 will be described. Although not shown in the figure, the control ECU 31 includes an input circuit to which a communication signal and a detection signal from the power sensor unit 16 and the like are input, a microcomputer that executes various calculations using signals from the input circuit, And an output circuit that outputs a control signal for controlling each unit based on a calculation by a computer. The microcomputer incorporates ROM (Read-Only Memory: ROM), RAM (Random Access Memory: RAM), etc. as storage means for storing various data, calculation results, etc. An updatable control program is stored.

  The control ECU 31 executes a control program stored in the storage means and executes each process described later. As with the HEMS monitor 32, the control ECU 31 is LAN-connected to each part. The control ECU 31 gives a control command to each unit so that each unit operates in accordance with an instruction input by the operation switch of the HEMS monitor 32. In addition, the control ECU 31 controls the display unit of the HEMS monitor 32 so as to display information according to the state of each unit.

  When the solar power generator 12 is generating electric power, the control ECU 31 performs control so that the electric power generated by sunlight is used most preferentially. This makes it possible to effectively use the photovoltaic power generation with the lowest cost.

  Further, the control ECU 31 communicates with the MEMS aggregator 62 which is another device, and controls the storage / discharge amount of the storage battery 33 according to an instruction from the MEMS aggregator 62. Therefore, the control ECU 31 performs control so that the storage battery 33 is discharged, for example, when there is a power saving request from the MEMS aggregator 62. Further, the control ECU 31 performs control so that the storage battery 33 is stored when there is a storage request from the MEMS aggregator 62. The storage battery 33 is not normally discharged, is used for emergency response for peak shift or peak cut, and stands by in a fully charged state.

  Next, storage / discharge control of the storage battery 33 of the MEMS aggregator 62 will be described with reference to FIGS. 2 and 3. The flow shown in FIG. 2 is a process that is repeatedly executed in a short time when the power storage unit 11 and the HEMS monitor 32 are powered on.

  In step S1, the first threshold value and the second threshold value are read from the MEMS cloud 63 and the power receiving equipment 61, and the process proceeds to step S2. The first threshold value is a value that is likely to reach the second threshold value based on the past power consumption tendency or the like, based on the total power supplied from the power receiving facility 61 to each smart apartment 50. The first threshold value is a total limit value in which the total power supplied to the plurality of smart apartments 50 is smaller than the total limit value of the power supply. In other words, the first threshold value is a value smaller than the sum of the limit values of the supplied power that can be supplied from the power receiving facility 61 to the plurality of smart apartments 50. The second threshold value is a limit value of supply power at which power supply from the power receiving facility 61 to the smart apartment 50 is stopped and the smart apartment 50 in the management of the power receiving facility 61 fails. These threshold values are set based on the power that can be supplied by the power company 60 and the contracted capacity of the power receiving facility 61.

  In step S2, it is determined whether or not the total power supplied from the power receiving facility 61 to each smart apartment 50 is greater than the first threshold value. If so, the process proceeds to step S3. If not, the process proceeds to step S4. Move on.

  In step S3, since the total supply power is larger than the first threshold value, there is a possibility that the second threshold value may be reached, so that the storage battery 33 installed in the smart apartment 50 in the management of the power receiving facility 61 is discharged to save power. Send the request and end this flow. Accordingly, the control ECU 31 of each smart apartment 50 controls the storage battery 33 to discharge from the MEMS cloud 63 based on the above-described power saving request.

  In step S4, it is determined whether or not the power supplied by the power company 60 is larger than the second threshold value. If so, the process proceeds to step S5. If not, the process proceeds to step S6. In step S5, since the power supply of the electric power company 60 is larger than the second threshold value, there is a possibility that the electric power company 60 may reach the third threshold value for power failure. Control is performed so that the storage battery 33 is discharged, and this flow ends. As a result, even if the power supplied to the smart apartment 50 within the management of the power receiving facility 61 is less than or equal to the first threshold, the power company 60 supplies a large amount of power to other facilities, and the power supplied increases. The storage battery 33 in the management of the power receiving facility 61 is controlled to discharge. Accordingly, the control ECU 31 of each smart apartment 50 controls the storage battery 33 to discharge from the MEMS cloud 63 based on the above-described power saving request. Moreover, based on the power-saving request | requirement from the electric power company 60, you may judge that it exceeds the 2nd threshold value, and you may transfer to step S5.

  In step S6, it is determined whether or not each storage battery 33 is fully charged based on the storage amount of each storage battery 33 acquired via the MEMS cloud 63. If the storage battery 33 is fully charged, the process proceeds to step S7. If not, the process moves to step S8. In step S7, since the battery is fully charged, a standby state is set in preparation for a power saving request, and this flow ends. In step S8, since there is a storage battery 33 that is not fully charged, a storage request is transmitted so that the battery is charged until it is fully charged, and this flow ends. Control ECU31 which received the electrical storage request | requirement controls it to electrically store until it becomes full electrical storage (SOC = 100%) according to an electrical storage request | requirement. Accordingly, when there is no power saving request, the storage battery 33 in the management of the power receiving facility 61 is charged until it is fully charged and enters a standby state.

  As shown in FIG. 3, in the third case, the power supplied by the electric power company 60 exceeds the third threshold value, so that the limit amount is exceeded and a power failure occurs. In order to avoid such a third case, the storage battery 33 in the management of the power receiving equipment 61 is controlled to perform peak shift or peak cut.

  For example, as in the first case, when the power supplied to the power receiving facility 61 is greater than the first threshold value and less than or equal to the second threshold value, a power saving request process is performed in step S3. Further, as in the second case, since the power supplied by the electric power company 60 is greater than the second threshold value and below the third threshold value, power saving is performed for all the power receiving facilities 61 managed by the electric power company 60. Send a request. As a result, a power saving request in step S5 is made, and the third case is suppressed.

  As described above, the MEMS aggregator 62 according to the present embodiment is installed in a plurality of managed smart apartments 50 when the total power supplied to the plurality of smart apartments 50 is larger than the first threshold. Control is performed so that the storage battery 33 is discharged. Thereby, the power consumption in each smart apartment 50 can be supplemented by the storage battery 33. Therefore, the power supplied to each smart apartment 50 can be reduced. Thus, reaching the upper limit value of the power supplied to the power receiving facility 61 can be suppressed.

  Moreover, in this embodiment, when the MEMS aggregator 62 receives a power saving request, the MEMS aggregator 62 controls the storage batteries 33 that are installed in a plurality of managed smart apartments 50 to be discharged. As a result, when the power supply limit of the electric power company 60 is approached, the electric power company 60 transmits a power saving request to the plurality of MEMS aggregators 62, whereby the storage batteries 33 managed by the plurality of MEMS aggregators 62 are managed. It can be discharged. Thereby, it is possible to suppress the supply power of the power company 60 from reaching the limit value.

  Furthermore, in the present embodiment, the MEMS aggregator 62 stores the storage battery 33 until it is fully charged when the power consumption in the smart apartment 50 is equal to or lower than the first threshold and a power saving request is not received. To control. As a result, the storage battery 33 can be put on standby in a fully charged state, and it is possible to prevent the capacity of the storage battery 33 from being insufficient when necessary.

  In other words, in the power supply system 10 of the present embodiment, when the power demand of the power company 60 is tight, the load on the smart apartment 50 and the power company 60 that collectively receive high-voltage power managed by the MEMS aggregator 62 is reduced. Add storage battery control for not. Specifically, when the MEMS aggregator 62 receives a request for power saving from the power company 60, the storage battery 33 in the smart apartment 50 is immediately switched to the discharge mode. When there is no request for power saving from the electric power company 60, the storage battery 33 is charged in preparation for the request from the electric power company 60, and is put on standby when it is fully charged. As a result, the power saving request from the electric power company 60 can be dealt with reliably, and the electric power can be leveled.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  The structure of the said embodiment is an illustration to the last, Comprising: The scope of the present invention is not limited to the range of these description. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  In the first embodiment described above, the storage battery 33 of each smart apartment 50 is remotely controlled by the MEMS aggregator 62, but the present invention is not limited to such remote control. For example, when the power consumption in the smart apartment 50 becomes larger than a limit value smaller than the limit value of the supplied power, the storage battery 33 may be controlled to be discharged. As a result, the power supplied to one smart apartment 50 can be reduced.

  Further, in the first embodiment described above, power is immediately stored by the power storage request. However, the power storage unit 11 is not limited to the control as described above, and after the power storage request, for example, the power storage unit 11 is operated in the midnight time zone when the power is low, The storage battery 33 may be charged.

  In the first embodiment described above, only one storage battery 33 is installed in the smart apartment 50, but the number is not limited to one, and a plurality of storage batteries 33 may be provided. In addition, when a plurality of storage batteries 33 are installed, at least one storage battery 33 may be a storage battery 33 for requesting power saving, and the other storage batteries 33 are discharged when the power consumption in the smart apartment 50 is large and are late at night. You may use so that it may store with electric power.

  In the first embodiment described above, the control ECU 31 is controlled by communicating with the MEMS aggregator 62, but may communicate directly with other devices such as the power receiving facility 61 and the power company 60 instead of the MEMS aggregator 62. Good. In this case, the control ECU 31 may control each unit according to a direct request from the power company 60 and the power receiving facility 61. In the first embodiment, the power receiving facility 61 and the MEMS aggregator 62 are separate. However, the power receiving facility 61 and the MEMS aggregator 62 are not limited to separate units, and are realized by a single device having both functions of the power company 60 and the power receiving facility 61. May be.

  In the first embodiment described above, the building is the smart apartment 50, but the present invention is not limited to this. For example, the building may be a store, a factory, a warehouse, or the like.

  In the first embodiment described above, the solar power generator 12 is included. However, the solar power generator 12 may be replaced with a wind power generator, or these power generators may not be included. .

  In the first embodiment described above, the power storage unit 11 is configured to be fixed outside the building, for example, but is not limited to such a configuration. Storage battery 33 may be, for example, a plug hybrid (PHV) vehicle equipped with an in-vehicle storage battery, or may be an electric vehicle. Moreover, if it is a vehicle carrying the storage battery 33, it will not be limited to what uses the electric power stored in the storage battery 33 for the drive of a vehicle. Such a vehicle can be connected to the wiring, and the in-vehicle storage battery can be controlled in the same manner as the storage battery 33 of the first embodiment.

10 ... Power supply system 13 ... Home load (electric load)
16 ... Electric power sensor unit (detection means) 18 ... Shared load (electric load)
DESCRIPTION OF SYMBOLS 31 ... Control ECU (communication means, control means) 33 ... Storage battery 50 ... Smart apartment (building) 60 ... Electric power company 61 ... Power receiving equipment 62 ... MEMS aggregator (management apparatus)

Claims (6)

An electric power supply system (10) capable of supplying the electric power (13, 18) connected to the wiring of the building (50) with the electric power supplied to the building from the electric power supply source based on the electric power supply contract Because
A storage battery (33) connected to the wiring and capable of storing the supplied power supplied from the power system and capable of discharging the stored power to the wiring;
Communication means (31) for communicating with other devices;
Detection means (16) for detecting power consumption by the electrical load;
Control means (31) for controlling the storage / discharge amount of the storage battery,
The control means includes
When the power consumption detected by the detection means is greater than a predetermined limit value, control to discharge the storage battery,
When the power consumption in the building is equal to or less than the limit value and the communication means receives a power saving request that is a request to reduce the power supplied to the building, the storage battery is discharged. A power supply system characterized by controlling. A management device (62) that communicates with the power supply source and the plurality of buildings to manage the power supply to the plurality of buildings and the power consumption in the plurality of buildings;
The management device discharges the storage batteries installed in the plurality of buildings managed when the total of the supplied power to the plurality of buildings becomes larger than a predetermined total limit value. The power supply system according to claim 1, wherein the power supply system is controlled as follows.   3. The power supply according to claim 2, wherein, when the management device receives the power saving request, the management device controls to discharge the storage batteries installed in the plurality of buildings being managed. system.   When the power consumption in the building is equal to or less than the limit value and the power saving request is not received, the control means controls to store the storage battery until it is fully charged. The power supply system according to any one of claims 1 to 3.   5. The power supply system according to claim 1, wherein the limit value is a value smaller than a limit value of the supply power that can be supplied from the power supply source to the building.   The power supply system according to claim 2, wherein the total limit value is a value smaller than a total limit value of the supplied power that can be supplied from the power supply source to each building.

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