JP5853144B2 - Power supply control device and power supply system including the same - Google Patents

Power supply control device and power supply system including the same Download PDF

Info

Publication number
JP5853144B2
JP5853144B2 JP2011112649A JP2011112649A JP5853144B2 JP 5853144 B2 JP5853144 B2 JP 5853144B2 JP 2011112649 A JP2011112649 A JP 2011112649A JP 2011112649 A JP2011112649 A JP 2011112649A JP 5853144 B2 JP5853144 B2 JP 5853144B2
Authority
JP
Japan
Prior art keywords
power
heat
water heater
pump water
heat pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2011112649A
Other languages
Japanese (ja)
Other versions
JP2012244780A (en
Inventor
高橋 勇人
勇人 高橋
薮ノ内 伸晃
伸晃 薮ノ内
小林 晋
晋 小林
Original Assignee
パナソニックIpマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニックIpマネジメント株式会社 filed Critical パナソニックIpマネジメント株式会社
Priority to JP2011112649A priority Critical patent/JP5853144B2/en
Publication of JP2012244780A publication Critical patent/JP2012244780A/en
Application granted granted Critical
Publication of JP5853144B2 publication Critical patent/JP5853144B2/en
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

Links

Images

Description

  The present invention relates to a power supply control device that controls power supply to a power load from a power generation device that generates power using natural energy, a power storage device including a storage battery, and a commercial power system, and a power supply system including the power supply control device.

  Conventionally, as a system for supplying electric power to an electric power load, a solar power generation apparatus that generates power using solar energy, a distributed power supply system that supplies electric power to an electric power load from a storage battery, and a private power generation apparatus are known ( For example, see Patent Document 1).

  The distributed power supply system described in Patent Document 1 stores excess power in a storage battery when the amount of power stored in the storage battery is equal to or less than a predetermined value when the generated power of the photovoltaic power generation apparatus is larger than the load power of the consumer. Then, the remaining power is returned to the commercial power system.

  On the other hand, when the value obtained by subtracting the generated power of the solar power generation device from the load power of the consumer is equal to or greater than the predetermined power, the distributed power supply system described in Patent Literature 1 causes the private power generation device to generate power. When the generated power of the solar power generation device is smaller than the load power of the consumer, if the sum of the generated power of the solar power generation device and the generated power of the private power generation device is greater than the load power of the consumer, the surplus power is Charge the battery. When the sum of the power generated by the photovoltaic power generator and the power generated by the private power generator is smaller than the load power of the consumer, the distributed power system described in Patent Document 1 is insufficient if the storage amount of the storage battery is not zero. The power of the minute is supplemented by the discharge from the storage battery. On the other hand, if the storage amount of the storage battery is zero, the shortage of power is supplemented by the commercial power system.

JP 2010-259303 A

  As described above, the conventional distributed power supply system described in Patent Document 1 stores power stored in a storage battery when the sum of the power generated by the solar power generator and the power generated by the private power generator is smaller than the load power of the consumer. If the amount is not zero, the shortage of power is supplemented by discharge from the storage battery. For this reason, the conventional distributed power supply system is configured such that when the sum of the generated power of the photovoltaic power generator and the generated power of the private power generator is smaller than the load power of the consumer, the magnitude of the consumer load power, that is, the discharge amount of the storage battery Regardless of the size, the storage battery is discharged.

  By the way, when the storage battery is discharged, power conversion is performed by a transformer and a DC / AC converter provided in a power supply path from the storage battery to the power load.

  However, when the load power of the consumer is small and the power converted by the transformer and the DC / AC converter becomes smaller than the capacity of the transformer and the DC / AC converter, the power conversion efficiency is deteriorated as shown in FIG. There is a problem that power loss during power conversion increases.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a power supply control device capable of effectively supplying power from a power storage device to a power load group in a state where power loss during power conversion is small, and the power supply control device It is providing the electric power supply system containing this.

The power supply control device of the present invention includes a heat pump water heater and a heat pump water heater, including a power generator that generates power using natural energy, a power storage device that includes a storage battery that stores power generated by the power generator, and a commercial power system. Is a power supply control device that controls power supply to power load groups including different power loads, the control unit controlling power supply from the power storage device to the power load group, and the heat demand of the heat pump water heater A heat demand prediction unit that predicts the amount of power consumed by the heat pump water heater necessary for obtaining the heat of the heat demand predicted by the heat demand prediction unit; a power storage information acquiring section for acquiring information, a first determination unit for determining whether or not the storage amount is larger than the power consumption amount, negatively charged relates to a load power of the power load The load power is larger than the power consumption during operation of the heat pump water heater when it is determined by the first determination unit that a power information acquisition unit that acquires information and the power storage amount is equal to or less than the power consumption amount And a second determination unit that determines whether or not , a power converter is provided in a power supply path from the power storage device to the power load group, and the power converter is converted by the power converter As the DC power becomes smaller than the capacity of the power converter, the power conversion efficiency becomes worse and the power loss at the time of power conversion increases, and the control unit is configured such that the power generation amount of the power generation device is greater than a predetermined threshold value. When the power storage amount is smaller than the power consumption amount, the storage battery is discharged and the power storage device passes through the power converter to the power load group when the first determination unit determines that the power storage amount is greater than the power consumption amount. To supply power While controlling the serial power storage device, when the charged amount is determined to be less than the power consumption in the first determination portion, and the load power consumption is greater than during the operation of the heat pump water heater When determined by the second determination unit, the storage battery is discharged and the power storage device is controlled so that the power storage device supplies power to the power load group via the power converter, and the load power Is determined to be less than or equal to the power consumption during operation of the heat pump water heater, the second determination unit determines that the storage battery stops discharging, and the power storage device is connected to the power load group via the power converter. The power storage device is controlled to stop supplying electric power to the battery .

  In the power supply control device, the power supply control device includes a database that stores information on past heat demand of the heat pump water heater, and the heat demand prediction unit uses the information on the past heat demand stored in the database. It is preferable to predict the heat demand.

  In this power supply control device, the power supply control device includes a database that stores information on past heat usage patterns in the heat pump water heater, and the heat demand prediction unit uses information on the past heat usage patterns stored in the database. It is preferable to predict the heat demand.

  The power supply control device includes a database that stores a predetermined value that is predetermined with respect to heat use in the heat pump water heater, wherein the heat demand prediction unit uses the constant value that is stored in the database. It is preferable to predict demand.

  The power supply control device may further include a database that stores a request regarding heat use in the heat pump water heater, and the heat demand prediction unit may predict the heat demand using the request stored in the database. preferable.

  This power supply control device preferably includes an air temperature information acquisition unit that acquires air temperature information related to air temperature, and the calculation unit obtains the power consumption amount using the air temperature information acquired by the air temperature information acquisition unit. .

  In this power supply control device, the database preferably corrects stored information.

  The power supply system of the present invention includes the power supply control device, a power generation device that generates power using natural energy, and a power storage device including a storage battery that stores the generated power of the power generation device.

  The present invention predicts the heat demand of a heat pump water heater, and discharges the storage battery when the amount of electricity stored in the storage battery is greater than the amount of power consumed by the heat pump water heater required for the heat demand. As a result, the storage battery can be discharged during a time period when the discharge amount is large. Therefore, when power is supplied from the power storage device to the power load group, a transformer and a DC alternating current provided in the power supply path from the storage battery to the power load group Power loss in at least one of the converters can be reduced. As a result, the electric power stored in the storage battery can be used effectively.

FIG. 2 is a power supply system according to the first embodiment, where (a) is a block diagram illustrating an overall configuration, and (b) is a block diagram illustrating a configuration of a power supply control device. It is explanatory drawing of the heat demand of the heat pump water heater which concerns on the same as the above. It is a flowchart which shows operation | movement of the electric power supply system which concerns on the same as the above. It is a characteristic view which shows the relationship between the conversion efficiency of a transformer and a DC / AC converter, and a load factor.

  In the following first to fourth embodiments, a power supply control device and a power supply system that control power supply to a power load group from a power generation device that generates power using natural energy, a power storage device including a storage battery, and a commercial power system explain.

(Embodiment 1)
As shown in FIG. 1A, the power supply system 1 according to the first embodiment includes a power supply control device 2 that controls power supply to the power load group 7, a power generation device 3 that performs grid connection, and power generation. And a power storage device 4 for storing the DC power generated by the device 3. The power supply system 1 includes a DC / AC converter 5 that converts DC power into AC power, and a temperature sensor 6 that detects air temperature. The power supply system 1 supplies power to the power load group 7 from the power generation device 3, the power storage device 4, and the commercial power system 8. Hereinafter, the power generator 3, the power storage device 4, and the commercial power system 8 are collectively referred to as “power source”.

  The power load group 7 includes a heat pump water heater 71 installed at a consumer and a power load 72 different from the heat pump water heater 71.

  Although not shown, the heat pump water heater 71 includes a heat pump unit, a hot water storage tank, and a water heater controller. The heat pump unit circulates the heat exchanger for air that absorbs heat from the outdoor air (atmosphere), the compressor that compresses the refrigerant, the heat exchanger for heating water that boils hot water, the expansion valve, and water And a circulating pump. The circulation pump returns the water supplied from the hot water storage tank to the hot water storage tank via the water heating heat exchanger. A pipe for supplying water from the water supply and a pipe for supplying stored hot water into the house are connected to the hot water storage tank. If the hot water supply control signal transmitted from the hot water supply controller is instructed to operate, the heat pump unit operates the compressor and the circulation pump. If the hot water supply control signal transmitted from the water heater controller is instructed to stop, the operation of the compressor and the circulation pump is stopped and the operation is stopped.

  Here, the operation mode of the heat pump water heater 71 is a mode in which hot water is boiled together at night (particularly at midnight). Therefore, when the heat pump water heater 71 is in operation, it means when the compressor and circulation pump of the heat pump unit are operated at night (especially at midnight). Power consumption during boiling operation at midnight. On the other hand, the power consumption other than when the heat pump water heater 71 is in operation refers to the power consumption for standby and the power consumption during heating operation. The reheating operation is an operation in which hot water is boiled when the hot water is used more than necessary or when hot water runs out even at night (midnight).

  The power generation device 3 generates power using natural energy. Examples of natural energy include solar energy and wind energy. This embodiment demonstrates the case where natural energy is solar energy and the electric power generating apparatus 3 is a solar power generation device.

  The power generation device 3 of this embodiment includes a solar cell 31 that converts solar energy into electrical energy, and a transformer 32 that converts the magnitude of DC power (generated power) generated by the solar cell 31. .

  The power storage device 4 includes a storage battery 41 that stores the DC power supplied from the power generation device 3, a charging transformer 42 that converts the magnitude of the DC power supplied from the power generation device 3, and a direct current discharged from the storage battery 41. And a discharge transformer 43 for converting the magnitude of electric power. The power storage device 4 includes a charge / discharge control unit 44 that controls charging / discharging of the storage battery 41.

  The storage battery 41 is, for example, a nickel-cadmium battery, a nickel metal hydride battery, a lithium ion battery, or a lead storage battery. In the discharge transformer 43, as the DC power converted by the discharge transformer 43 becomes smaller than the capacity of the discharge transformer 43, the power conversion efficiency deteriorates and the power loss during power conversion increases (see FIG. 4). The charge / discharge control unit 44 controls the charging / discharging of the storage battery 41 by controlling the operation of the charging transformer 42 and the discharging transformer 43 in accordance with a control signal received from the power supply control device 2. The power storage device 4 can supply power from the power storage device 4 to the power load group 7 by discharging the storage battery 41.

  The DC / AC converter 5 is, for example, a power conditioner, and is provided in a power feeding path from the power generation device 3 and the power storage device 4 to the power load group 7. The DC / AC converter 5 converts the DC power from the power generation device 3 and the DC power from the power storage device 4 into AC power. By the way, in the DC / AC converter 5, as the electric power converted by the DC / AC converter 5 becomes smaller than the capacity of the DC / AC converter 5, the power conversion efficiency deteriorates and the power loss during power conversion increases ( (See FIG. 4).

  Next, the power supply control device 2 will be described. As shown in FIG. 1B, the power supply control device 2 includes a processing device 21 that executes various types of processing and a storage device 22 that stores various types of information. The power supply control device 2 includes a computer (including a microcomputer) on which a CPU (Central Processing Unit) and a memory are mounted as main components.

  The processing device 21 includes a CPU 211 as a main component, and includes a control unit 211 that controls power supply from the power generation device 3 and the power storage device 4 to the power load group 7. The power supply control device 2 includes a heat demand prediction unit 212 that predicts the heat demand of the heat pump water heater 71, and a calculation unit 213 that calculates the power consumption of the heat pump water heater 71 necessary to obtain the heat of the heat demand. ing. In addition, the processing device 21 includes a power storage information acquisition unit 214 that acquires power storage information from the power storage device 4 and a first determination unit that determines whether or not the power storage amount of the storage battery 41 is greater than the power consumption amount of the heat pump water heater 71. 215. Furthermore, the processing device 21 determines whether or not the power information acquisition unit 216 that acquires the load power information from the power load 72 and the load power of the power load 72 is greater than the power consumption during the operation of the heat pump water heater 71. 2 determination units 217. Further, the processing device 21 includes a third determination unit 218 that determines the power generation state of the power generation device 3.

  The 3rd determination part 218 detects the electric power generation amount per unit time of the electric power generating apparatus 3, and determines whether the detected electric power generation amount is more than a threshold value. The threshold value is a predetermined value. When the power generation amount of the power generation device 3 is equal to or greater than the threshold, the current time zone is daytime, and the power generation device 3 is generating power. On the other hand, when the power generation amount of the power generation device 3 is less than the threshold, the current time zone is nighttime, and the power generation device 3 is not generating power.

  The heat demand prediction unit 212 acquires heat storage information from the heat pump water heater 71 when the third determination unit 218 determines that the power generation amount of the power generation device 3 is smaller than the threshold. The heat storage information is information related to the current heat storage amount of the heat pump water heater 71 (hot water storage tank). The heat demand prediction unit 212 that has acquired the heat storage information predicts the current heat demand of the heat pump water heater 71 using the heat storage information and the information stored in the database 221. As shown in FIG. 2, the heat demand A1 predicted by the heat demand prediction unit 212 is (night heating setting value A2) − {(current heat storage amount A3 of the heat pump water heater 71) − (at night after the present). The amount of heat used A4)}.

  The database 221 of the storage device 22 shown in FIG. 1 stores information necessary for prediction of heat demand by the heat demand prediction unit 212. The database 221 of the present embodiment stores information related to past heat demand of the heat pump water heater 71. The information regarding the past heat demand is, for example, the past heat demand of the customer or the past heat demand in the region to which the customer belongs.

  The heat demand prediction unit 212 of the present embodiment calculates, for example, the past several days average heat demand or the same day average heat demand using the information about the past heat demand stored in the database 221, Predict heat demand.

  The calculation part 213 calculates | requires the power consumption of the heat pump water heater 71 required in order to obtain the heat | fever of the heat demand estimated in the heat demand prediction part 212. FIG.

  The power storage information acquisition unit 214 acquires power storage information from the charge / discharge control unit 44 of the power storage device 4. The power storage information is information related to the amount of power stored in the storage battery 41 of the power storage device 4, for example, the output voltage of the storage battery 41. The output voltage of the storage battery 41 is measured by the power storage device 4. The means for measuring the output voltage of the storage battery 41 may be provided in the power supply control device 2 instead of the power storage device 4.

  The first determination unit 215 uses the power consumption obtained by the calculation unit 213 and the power storage information acquired from the power storage information to determine whether the power storage amount of the storage battery 41 is greater than the power consumption of the heat pump water heater 71. Determine whether or not.

  The power information acquisition unit 216 acquires load power information related to the current load power of the power load 72 by, for example, means for detecting a load current flowing through the power load 72 when the load voltage applied to the power load 72 is constant. To do.

  The second determination unit 217 uses the load power information acquired by the power information acquisition unit 216 when the first determination unit 215 determines that the power storage amount is equal to or less than the power consumption amount. It is determined whether or not the load power is greater than the power consumption during operation of the heat pump water heater 71. Information regarding power consumption during operation of the heat pump water heater 71 is stored in the storage device 22 in advance. Note that the second determination unit 217 may acquire information on power consumption during operation of the heat pump water heater 71 from the heat pump water heater 71 instead of the storage device 22.

  Control unit 211 outputs a control signal to charge / discharge control unit 44 to control the operation of power storage device 4. Specifically, the control unit 211 performs the following control functions when the third determination unit 218 determines that the power generation amount of the power generation device 3 is less than the threshold value, that is, when the power generation device 3 is not generating power. To control the power supply from the power generation device 3 and the power storage device 4 to the power load group 7.

  When the first determination unit 215 determines that the amount of power stored in the storage battery 41 is greater than the amount of power consumed by the heat pump water heater 71, the control unit 211 discharges the storage battery 41 and the power storage device 4 supplies power to the power load group 7. The charge / discharge control unit 44 of the power storage device 4 is controlled so as to supply.

  On the other hand, when the first determination unit 215 determines that the storage amount of the storage battery 41 is equal to or less than the power consumption amount of the heat pump water heater 71, the control unit 211 depends on the determination result of the second determination unit 217, The following control is performed.

  When the second determination unit 217 determines that the load power of the power load 72 is greater than the power consumption during operation of the heat pump water heater 71, the control unit 211 causes the storage battery 41 to discharge and the power storage device 4 to be the power load group. The charge / discharge control unit 44 of the power storage device 4 is controlled so as to supply power to 7. On the other hand, when the second determination unit 217 determines that the load power of the power load 72 is equal to or less than the power consumption during operation of the heat pump water heater 71, the control unit 211 stores the power so that the storage battery 41 stops discharging. The charge / discharge control part 44 of the apparatus 4 is controlled. In this case, power is supplied from the commercial power system 8 to the power load group 7.

  When the third determination unit 218 determines that the power generation amount of the power generation device 3 is equal to or greater than the threshold, that is, when the power generation device 3 is generating power, the control unit 211 stops discharging the storage battery 41. The power storage device 4 is controlled to supply the generated power of the power generation device 3 to the power load group 7. When the generated power of the power generation device 3 is larger than the load power of the power load group 7, the control unit 211 controls the power storage device 4 so that the storage battery 41 stores the surplus power. On the other hand, when the generated power of the power generator 3 is less than or equal to the load power of the power load group 7, the insufficient power is supplied from the commercial power system 8 to the power load group 7.

  Incidentally, the power supply control device 2 further includes an air temperature information acquisition unit 219 that acquires air temperature information from the temperature sensor 6. The temperature sensor 6 is provided in the vicinity of the heat pump water heater 71 and detects the air temperature at the place where the heat pump water heater 71 is installed. The temperature information is information regarding the temperature detected by the temperature sensor 6.

  The storage device 22 stores the relationship between the temperature at the installation location of the heat pump water heater 71 and the coefficient of performance (COP). The coefficient of performance is an index representing the performance (capability) of the heat pump water heater 71 (heat pump unit). That is, the coefficient of performance represents the magnification of how much hot water is obtained with respect to the power consumption when the heat pump water heater 71 operates. For example, the coefficient of performance of the heat pump water heater 71 that produces a heating capacity of 4.5 kilowatts with a power consumption of 1.2 kilowatts is 4.5 ÷ 1.2≈3.7. However, the coefficient of performance varies depending on the amount of heat that the heat pump water heater 71 can take in from the outside (outside air), and has a characteristic of increasing as the outside air temperature increases.

  The calculation unit 213 selects a coefficient of performance corresponding to the temperature of the temperature information acquired by the temperature information acquisition unit 219 from the storage device 22, and uses the selected coefficient of performance to obtain a heat pump necessary for obtaining heat of heat demand. The amount of power consumption of the water heater 71 is obtained.

  As described above, the storage device 22 includes the database 221 that stores information necessary for prediction of heat demand, and stores various data.

  The database 221 of this embodiment stores the amount of heat used at night from the current time to the operation time of the heat pump water heater 71.

  The database 221 has a function of correcting (updating) stored information. The database 221 stores information on the past heat demand from the current time to the operation time of the heat pump water heater 71, or the amount of heat that the heat pump water heater 71 can discharge from the current time to the operation time of the heat pump water heater 71. The case is described below. When the past heat demand from the current time to the operation time of the heat pump water heater 71 is less than the amount of heat predicted to be used at night, the database 221 stores the past heat from the current time to the operation time of the heat pump water heater 71. Heat demand is corrected step by step as the amount of heat used at night. Similarly, when the amount of heat that the heat pump water heater 71 can discharge from the current time to the operation time of the heat pump water heater 71 is less than the amount of heat predicted to be used at night, the database 221 stores the heat pump water heater 71 from the current time. The amount of heat that can be discharged by the heat pump water heater 71 before the operation time is corrected as the amount of heat used at night. Note that description of functions similar to those of the database 221 of the first embodiment is omitted.

  The storage device 22 stores programs for the processing device 21 to perform various processes. That is, the storage device 22 stores a program for causing the processing device 21 (computer) to function as the control unit 211, the heat demand prediction unit 212, the calculation unit 213, the power storage information acquisition unit 214, and the first determination unit 215. ing. Furthermore, the storage device 22 stores a program for causing the processing device 21 to function as the power information acquisition unit 216, the second determination unit 217, the third determination unit 218, and the temperature information acquisition unit 219.

  The program is stored in advance in the storage device 22 when the power supply control device 2 is shipped. However, when the power supply control device 2 is installed after shipment, the power supply control device 2 may include a recording medium (for example, a memory card, a CD-ROM) on which the program is recorded as an example of a method for mounting the program. And a DVD-ROM). In the case of a method using a recording medium, the power supply control device 2 may include a drive device (not shown) for reading data on the recording medium. As another method, there is a method of downloading the program from a server using a network. In the case of the method of downloading the program via a network, the power supply control device 2 only needs to have a communication function (not shown) for communicating with the server using the network.

  Next, the operation of the power supply system 1 according to this embodiment will be described. First, an operation when the power generation device 3 (solar cell 31) is generating power will be described.

  When the power generation device 3 is generating power, that is, when the power generation amount of the power generation device 3 is equal to or greater than the threshold value, the generated power of the power generation device 3 is supplied to the power load group 7. When the generated power of the power generation device 3 is larger than the load power of the power load group 7, the control unit 211 of the power supply control device 2 controls the power storage device 4 so that the storage battery 41 stores the surplus power. On the other hand, when the generated power of the power generation device 3 is smaller than the load power of the power load group 7, the insufficient power is supplied from the commercial power system 8 to the power load group 7.

  Next, an operation when the power generation apparatus 3 (solar cell 31) does not generate power, such as at night, will be described with reference to FIG.

  When the power generation device 3 is not generating power, that is, when the power generation amount of the power generation device 3 is less than the threshold, the heat demand prediction unit 212 predicts the heat demand of the heat pump water heater 71 (S1 in FIG. 3). Then, the calculation part 213 calculates | requires the power consumption of the heat pump water heater 71 required for a heat demand (S2). The power storage information acquisition unit 214 acquires power storage information (S3). Thereafter, the first determination unit 215 determines whether or not the amount of power stored in the storage battery 41 is greater than the amount of power consumed by the heat pump water heater 71 (S4). When the storage amount of the storage battery 41 is greater than the power consumption of the heat pump water heater 71, if the storage battery 41 is not discharged (S5), the control unit 211 starts discharging the storage battery 41 (S6). If the storage battery 41 has already been discharged (S5), the control unit 211 continues discharging the storage battery 41 (S7). When the amount of power stored in the storage battery 41 is greater than the amount of power consumed by the heat pump water heater 71 by the above operation, the storage battery 41 is discharged by the instruction from the control unit 211 to the power storage device 4 and the power storage device 4 supplies power to the power load group 7. Supply. After executing Steps S6 and S7, the process returns to Step S3.

  In step S4, when the storage amount of the storage battery 41 is equal to or less than the power consumption amount of the heat pump water heater 71, the power information acquisition unit 216 acquires the load power information (S8). Thereafter, the second determination unit 217 determines whether or not the load power of the power load 72 is greater than the power consumption during operation of the heat pump water heater 71 (S9). When the load power of the power load 72 is equal to or lower than the power consumption during operation of the heat pump water heater 71, if the storage battery 41 is not discharged (S10), the control unit 211 maintains the discharge stopped state (S11). If the storage battery 41 is discharged (S10), the control part 211 stops the discharge of the storage battery 41 (S12). When the storage amount of the storage battery 41 is equal to or less than the power consumption amount of the heat pump water heater 71 and the load power of the power load 72 is equal to or less than the power consumption during operation of the heat pump water heater 71 by the above operation, the control unit 211 In response to an instruction to the power storage device 4, the storage battery 41 enters a discharge stopped state. After executing Steps S11 and S12, the process returns to Step S3.

  In step S9, when the load power of the power load 72 is larger than the power consumption during operation of the heat pump water heater 71, the storage battery 41 is discharged according to an instruction from the control unit 211 to the power storage device 4, and the power storage device 4 becomes the power load group 7 Electric power is supplied to (S5 to S7).

  From the above description, in the power supply system 1 of the present embodiment, the power supply control device 2 predicts the heat demand of the heat pump water heater 71, and the amount of power stored in the storage battery 41 is consumed by the heat pump water heater 71 necessary for the heat demand. The storage battery 41 is discharged when the amount of electric power is greater. As a result, the storage battery 41 can be discharged during a time period in which the amount of discharge is large. Therefore, when power is supplied from the power storage device 4 to the power load group 7, the power loss in the discharge transformer 43 or the DC / AC converter 5 is lost. Can be reduced. As a result, the electric power stored in the storage battery 41 can be used effectively.

  Furthermore, the power supply control device 2 of the present embodiment is such that the current load power of the power load 72 is the heat pump water heater even if the amount of power stored in the storage battery 41 is equal to or less than the power consumption of the heat pump water heater 71 required for heat demand. When the power consumption during operation of 71 is larger, the storage battery 41 is discharged. Thereby, power can be effectively supplied from the power storage device 4 to the power load 72.

  Moreover, according to the power supply control device 2 of the present embodiment, the heat demand of the heat pump water heater 71 can be accurately predicted by using the information related to the past heat demand of the heat pump water heater 71.

  According to the power supply control device 2 of the present embodiment, the power consumption amount of the heat pump water heater 71 can be accurately obtained by reflecting the air temperature.

  Further, the power supply control device 2 of the present embodiment is stored in the database 221 based on the amount of heat that can be discharged before the heat pump water heater 71 operates or the past heat demand until the heat pump water heater 71 operates. The information is corrected one by one. As a result, when the operation of the heat pump water heater 71 is stopped, the amount of electricity stored in the storage battery 41 can be brought close to zero. Can be stored in the storage battery 41 more.

  Note that, when the first determination unit 215 determines that the storage amount of the storage battery 41 is equal to or less than the power consumption amount of the heat pump water heater 71, the control unit 211, regardless of the determination result of the second determination unit 217, You may control the charging / discharging control part 44 of the electrical storage apparatus 4 so that the storage battery 41 stops discharge.

(Embodiment 2)
The power supply control device 2 according to the second embodiment predicts the current heat demand of the heat pump water heater 71 using information on past heat usage patterns in the heat pump water heater 71, and thus the power supply control according to the first embodiment. Different from the device 2. In addition, about the component similar to the power supply control apparatus 2 of Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The database 221 of this embodiment stores information on past heat usage patterns in the heat pump water heater 71. The past heat use pattern in the heat pump water heater 71 is, for example, a past heat use pattern of a consumer or a past heat use pattern in a region to which the customer belongs. Note that description of functions similar to those of the database 221 of the first embodiment is omitted.

  The heat demand prediction unit 212 of the present embodiment calculates, for example, the current number of heat uses or the amount of heat used at each use, for example, using information about past heat use patterns stored in the database 221. The heat demand prediction unit 212 predicts the current heat demand of the heat pump water heater 71 after predicting the amount of heat used at night by using the current heat usage count or the amount of heat used at each use. In addition, description is abbreviate | omitted about the function similar to the heat demand prediction part 212 of Embodiment 1. FIG.

  As described above, according to the power supply control device 2 of the present embodiment, it is possible to accurately predict the heat demand of the heat pump water heater 71 by using the information regarding the past heat use pattern in the heat pump water heater 71.

(Embodiment 3)
The power supply control device 2 according to the third embodiment predicts the current heat demand of the heat pump water heater 71 using a constant value related to heat use in the heat pump water heater 71, and the power supply control device 2 according to the first embodiment. Is different. In addition, about the component similar to the power supply control apparatus 2 of Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The database 221 of this embodiment stores a constant value of the total amount at night or a constant value for each time zone as a value related to heat use in the heat pump water heater 71. The constant value stored in the database 221 is a preset value. In addition, the time interval of a time slot | zone is not limited to 1 hour.

  The heat demand prediction unit 212 of the present embodiment predicts the current heat demand of the heat pump water heater 71 after predicting the amount of heat used at night by using a constant value stored in the database 221. In addition, description is abbreviate | omitted about the function similar to the heat demand prediction part 212 of Embodiment 1. FIG.

  As described above, according to the power supply control device 2 of the present embodiment, the heat demand of the heat pump water heater 71 can be easily predicted by using a predetermined value regarding heat use in the heat pump water heater 71.

(Embodiment 4)
The power supply control device 2 according to the fourth embodiment is different from the power supply control device 2 according to the first embodiment in that the current heat demand of the heat pump water heater 71 is predicted in consideration of the demand of the customer. In addition, about the component similar to the power supply control apparatus 2 of Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The database 221 of this embodiment stores a request regarding heat use in the heat pump water heater 71. The request stored in the database 221 is, for example, a request for the amount of heat used at night from a customer, or a request for an action (for example, hot water filling) using heat stored in a hot water storage tank. The request is input to the heat pump water heater 71 by an input unit (not shown) provided in the heat pump water heater 71, and then output from the heat pump water heater 71 to the power supply control device 2 and stored in the database 221. . Note that description of functions similar to those of the database 221 of the first embodiment is omitted.

  The heat demand prediction unit 212 of the present embodiment predicts the current heat demand of the heat pump water heater 71 using the request stored in the database 221. In addition, description is abbreviate | omitted about the function similar to the heat demand prediction part 212 of Embodiment 1. FIG.

  As mentioned above, according to the power supply control apparatus 2 of this embodiment, since the said request | requirement can be reflected in prediction of the heat demand of the heat pump water heater 71 by using the request | requirement regarding the heat use in the heat pump water heater 71, demand The heat demand suitable for the house can be predicted.

  In addition, although the operation mode of the heat pump water heater 71 of each embodiment is a mode which boils hot water collectively at night (especially late night), for example, when the hot water storage amount of a hot water storage tank becomes less than a fixed amount, for example. There is a mode to boil until the amount of hot water is full. In the mode of boiling up until the amount of stored hot water becomes full, the storage battery 41 is discharged because the power consumption of the heat pump water heater 71 is large at the time of boiling. Thereafter, both the storage amount of the storage battery 41 and the heat demand of the heat pump water heater 71 are corrected. Further, as another operation mode, there is a mode in which when the amount of hot water stored in the hot water storage tank becomes less than the minimum amount of stored hot water, the amount of stored hot water is frequently heated so as to maintain the minimum amount of stored hot water. In the mode of boiling frequently, the sum of the current power consumption of the heat pump water heater 71 (power consumption other than when the heat pump water heater 71 is in operation) and the load power of the power load 72 is the same as when the heat pump water heater 71 is operating at night. If it becomes larger than power consumption, the storage battery 41 will discharge. If the sum of the current power consumption of the heat pump water heater 71 and the load power of the power load 72 is less than the power consumption during operation of the heat pump water heater 71 at night, power is supplied from the commercial power system 8 to the power load group 7. Is done. Thereafter, the storage amount of the storage battery 41 and the heat demand of the heat pump water heater 71 are corrected.

DESCRIPTION OF SYMBOLS 1 Power supply system 2 Power supply control apparatus 211 Control part 212 Heat demand prediction part 213 Calculation part 214 Power storage information acquisition part 215 1st determination part 216 Power information acquisition part 217 2nd determination part 219 Temperature information acquisition part 221 Database 3 Power generation device 4 Power storage device 41 Storage battery 7 Power load group 71 Heat pump water heater 72 Power load 8 Commercial power system

Claims (8)

  1. A power load group that includes a power generation device that generates power using natural energy, a power storage device that includes a storage battery that stores power generated by the power generation device, and a commercial power system, and includes a heat pump water heater and a power load different from the heat pump water heater. A power supply control device for controlling power supply to
    A control unit for controlling power supply from the power storage device to the power load group;
    A heat demand prediction unit for predicting the heat demand of the heat pump water heater;
    A calculation unit for obtaining power consumption of the heat pump water heater necessary to obtain heat of the heat demand predicted by the heat demand prediction unit;
    A power storage information acquisition unit for acquiring power storage information related to a power storage amount of the storage battery;
    A first determination unit that determines whether or not the power storage amount is greater than the power consumption amount ;
    A power information acquisition unit that acquires load power information related to load power of the power load;
    Second determination for determining whether or not the load power is larger than the power consumption during operation of the heat pump water heater when the first determination unit determines that the amount of stored electricity is equal to or less than the power consumption amount With
    A power converter is provided in the power supply path from the power storage device to the power load group,
    The power converter, as the DC power converted by the power converter is smaller than the capacity of the power converter, the power conversion efficiency becomes worse, and the power loss during power conversion increases.
    The control unit, when the power generation amount of the power generation device is smaller than a predetermined threshold,
    When the charged amount is determined by many as the first determination unit than the power consumption, for supplying power the electric storage device the storage battery to discharge to the power load group through the power converter While controlling the power storage device as
    When the charged amount is determined to be less than the power consumption in the first determination section, the determination by the second determination unit and the load power is greater than the power consumption during operation of the heat pump water heater Then, the storage battery is discharged and the power storage device controls the power storage device to supply power to the power load group via the power converter, and the load power is in operation of the heat pump water heater. When the second determination unit determines that the power consumption is less than or equal to the power consumption, the storage battery stops discharging and the power storage device stops supplying power to the power load group via the power converter The power supply control device , wherein the power storage device is controlled as described above .
  2. A database for storing information on past heat demand of the heat pump water heater;
    The heat demand prediction unit predicts the heat demand using information on the past heat demand stored in the database.
    The power supply control device according to claim 1.
  3. A database for storing information on past heat usage patterns in the heat pump water heater;
    The heat demand prediction unit predicts the heat demand using information related to the past heat use pattern stored in the database.
    The power supply control device according to claim 1.
  4. A database for storing a predetermined value for heat use in the heat pump water heater;
    The heat demand prediction unit predicts the heat demand using the constant value stored in the database.
    The power supply control device according to claim 1.
  5. A database for storing a request for heat use in the heat pump water heater;
    The heat demand prediction unit predicts the heat demand using the request stored in the database.
    The power supply control device according to claim 1.
  6. It has a temperature information acquisition unit that acquires temperature information related to temperature,
    The calculation unit obtains the power consumption using the temperature information acquired by the temperature information acquisition unit.
    The power supply control device according to claim 1, wherein the power supply control device is a power supply control device.
  7. The power supply control apparatus according to any one of claims 2 to 5, wherein the database corrects stored information.
  8. The power supply control device according to any one of claims 1 to 7,
    A power generation device that generates power using natural energy;
    A power storage device including a storage battery storing power generated by the power generation device;
    A power supply system comprising:
JP2011112649A 2011-05-19 2011-05-19 Power supply control device and power supply system including the same Expired - Fee Related JP5853144B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011112649A JP5853144B2 (en) 2011-05-19 2011-05-19 Power supply control device and power supply system including the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011112649A JP5853144B2 (en) 2011-05-19 2011-05-19 Power supply control device and power supply system including the same

Publications (2)

Publication Number Publication Date
JP2012244780A JP2012244780A (en) 2012-12-10
JP5853144B2 true JP5853144B2 (en) 2016-02-09

Family

ID=47465898

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2011112649A Expired - Fee Related JP5853144B2 (en) 2011-05-19 2011-05-19 Power supply control device and power supply system including the same

Country Status (1)

Country Link
JP (1) JP5853144B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6462284B2 (en) * 2014-09-13 2019-01-30 大和ハウス工業株式会社 Energy management system and energy management method
JP6459689B2 (en) 2015-03-24 2019-01-30 株式会社デンソー Control device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010273407A (en) * 2009-05-19 2010-12-02 Osaka Gas Co Ltd Energy supply system
JP5405963B2 (en) * 2009-09-28 2014-02-05 パナソニック株式会社 Heat pump hot water supply system

Also Published As

Publication number Publication date
JP2012244780A (en) 2012-12-10

Similar Documents

Publication Publication Date Title
US9099893B2 (en) Power control device for a power grid, comprising a control unit for controlling an energy flow between the power generation unit, the energy storage unit, the consumer unit and/or the power grid
JP5107345B2 (en) Modular energy control system
EP2639922B1 (en) Operation planning method and operation planning device
US8571720B2 (en) Supply-demand balance controller
US9916630B2 (en) Electricity suppressing type electricity and heat optimizing control device, optimizing method, and optimizing program
JP5271329B2 (en) Battery management system
US8456878B2 (en) Power storage system and method of controlling the same
JP2007151371A (en) System cooperation-type variation suppressing system and output variation suppression method
WO2011065496A1 (en) Control apparatus, control system, and control method
JP5095495B2 (en) Electric power system and control method thereof
CN102598454B (en) Control device and control method
US20120229077A1 (en) Electric power supply system and method for controlling electric power discharge
WO2013062016A1 (en) Load controller, program, load control system
JP5789792B2 (en) supply and demand control device, supply and demand control method, and supply and demand control system
JP4984207B2 (en) Redox flow battery system
DE102012202465A1 (en) Power supply system for supplying electric current to e.g. house to charge battery of hybrid car, has storage device storing surplus of electric solar when amount of electricity is larger than amount of electric current consumed by load
JP2010220428A (en) Power interchanging system
JP4889167B2 (en) Cogeneration system operation planning method
JP2011069587A (en) Heat pump hot water supply system
JP5652196B2 (en) Inverter
JP5167106B2 (en) Wind power plant and its power generation control method
US9261284B2 (en) Operation planning method, and heat pump hot water supply and heating system operation method
JP6002196B2 (en) Load control device
EP2719971B1 (en) Operating method for heat pump, and heat pump system
JP6168564B2 (en) Method and power generation system for supplying electrical energy from a distributed energy source

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20140207

A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A711

Effective date: 20141008

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20141021

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20141104

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20150105

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20150623

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20150717

R151 Written notification of patent or utility model registration

Ref document number: 5853144

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151

LAPS Cancellation because of no payment of annual fees