JP2015012720A - Hot-water supply control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress low a meter-rate charge required for a boiling operation of a heat pump hot-water heater to be boiled while suppressing low daily maximum demand power in a hot-water supply control system for controlling a plurality of heat pump hot-water heaters.SOLUTION: Total power consumption for each time zone of any other electrical appliances than a plurality of heat pump hot-water heaters within a predetermined target area is predicted. A boiling operation of the heat pump hot-water heater to be boiled is preferentially executed in a time zone of a low meter-rate charge unit price within such a range that a sum of the predicted total power consumption for each time zone and power consumption for each time zone required for boiling the plurality of heat pump hot-water heaters becomes equal to or less than an upper limit power amount.

Description

  The present invention relates to a hot water supply control system that controls a plurality of hot water heaters.

  Conventionally, various water heaters, for example, heat pump water heaters are known. As disclosed in Patent Document 1, for example, the heat pump water heater includes a refrigerant circuit that performs a refrigeration cycle, and a hot water storage tank that stores water heated by warm heat obtained by the refrigeration cycle. For example, in an all-electric housing complex, a heat pump water heater is installed in each house.

  On the other hand, in recent years, an increasing number of apartment houses have adopted so-called high-voltage collective power reception. As disclosed in Patent Document 2, this high-voltage collective power reception is performed by a management company contracting with an electric power company collectively receiving high-voltage (for example, 6600 volt) power and stepping it down to 100 volts or 200 volts. This is a mechanism to distribute electricity to each house.

JP 2012-207914 A JP 2003-324844 A

  In many cases, the electricity charge for receiving high-voltage power is the sum of a basic charge determined according to the maximum demand power and a metered charge proportional to the amount of power used. The maximum demand power is the maximum value of power used every predetermined reference time (for example, 30 minutes). For example, if the power used at a certain reference time (for example, from 14:00 to 14:30 on August 1) is 150 kW, even if the power used at other reference times is 120 kW or less, A basic charge calculated based on 150 kW, which is the maximum power demand, is applied for one year.

  For this reason, when performing high-voltage collective power reception, it is desirable to reduce the basic charge by keeping the daily maximum demand power in the target area (for example, one apartment house) low. For this reason, power consumption of other electric appliances such as an air conditioner excluding a heat pump water heater provided in a predetermined target area within a predetermined reference time (for example, 30 minutes) is large so as to keep the maximum daily demand power low. In some cases, many of the heat pump water heaters provided in the predetermined target area are not heated at the same time, but only a small number of water heaters are heated up, while the power consumption of other electrical appliances such as air conditioners. When there are few, it heats up many of the heat pump water heaters provided in the predetermined target area at the same time, and thereby, with each of the heat pump water heaters in the predetermined target area for each reference time (for example, 30 minutes) It is desirable to keep the total power consumption with other electrical appliances low.

  On the other hand, for pay-per-use charges according to the amount of power used, management companies that contract with electric power companies set pay-per-use unit prices cheaply during the day, such as during night hours when electric load is low, and daytime hours when electric load is high. In general, the unit price unit is set high. Therefore, even when the maximum daily demand power is kept low and the basic charge for power use is reduced as described above, for example, consumption of other electric appliances in a predetermined target area in two reference times (for example, 30 minutes). In a situation where the power is predicted to be almost the same as each other, when one reference time belongs to night time and the other reference time belongs to daytime time, the water heater is heated up within the two reference times. If you increase the number of water heaters that are heated up within the standard time of nighttime and reduce the number of water heaters that are heated during the standard time of daytime, Can be made cheaper.

  The present invention has been made in view of such points, and an object of the present invention is to provide a power supply control system for controlling a plurality of heat pump water heaters provided in a predetermined target area while keeping the maximum demand power of the day low and reducing the power consumption. The purpose is to keep the basic charge for use low and to keep the pay-per-use charge required for the heating operation of the heat pump water heater to be heated low.

  In order to achieve the above object, a hot water supply control system according to a first invention is a hot water supply control system for controlling a plurality of heat pump water heaters (60a, 60b,...) Each having a hot water storage tank (75). Heating operation of a water heater scheduled to be heated among the heat pump water heaters (60a, 60b,...) Of a predetermined target area including the plurality of heat pump water heaters (60a, 60b,...) From a commercial power source (10) ( (1) Within the range where the amount of power supplied per reference time to 15) is less than or equal to the reference power amount, the operation is executed with priority given to the time period in which the metered unit price of power for each time period divided into multiple days is low A part (58) is provided.

  In the first invention, the predetermined target area includes a plurality of heat pump water heaters and other electric appliances, and each reference time (for example, 30 minutes or 2 hours) from the commercial power source to the predetermined target area. Heating of the heat pump water heater that is scheduled to be heated is performed so that the amount of power supplied is less than or equal to the reference power amount. Basic charges can be kept cheap. In addition, regarding the heating operation of a plurality of heat pump water heaters that are scheduled to be heated, the heating operation of some of the heat pump water heaters is repeatedly executed in order from the time zone in which the power-based unit price is low in order. Therefore, in the time zone where the metered charge unit price is high, the boiling operation has already been completed for all of the heat pump water heaters to be heated, or the boiling operation is performed only for the remaining few heat pump water heaters. Therefore, the total usage fee required for the heating operation of the heat pump water heater can be reduced.

  In the hot water supply control system according to a second aspect of the present invention, in the hot water supply control system, the operation execution unit (58) is configured such that the heating operation of the hot water heater is performed earlier in a time zone where the metered unit price of power is the same. The band is given priority.

  In the second aspect of the invention, when there are a plurality of time zones with the same unit price, the heating operation of the heat pump water heater is executed in order from the time zone close to the current time. The number and the probability of the heat pump water heater boiling operation being performed during the time period when the metered unit price is high is reduced, and the total metered electricity bill is further reduced. be able to.

  A hot water supply control system according to a third aspect of the present invention is the hot water supply control system, wherein the operation execution unit (58) is a hot water supply with a small amount of heat stored in the hot water storage tank among the heat pump water heaters (60a, 60b, ...) to be heated. It is characterized in that the boiling operation of the vessel is executed with priority.

  In the third aspect of the invention, the heat pump water heater having a smaller amount of heat storage in the hot water storage tank is preferentially executed with its boiling operation earlier, so heat storage in the hot water storage tank having a lower amount of livestock heat is performed earlier, It is possible to prevent a shortage and running out of hot water.

  According to a fourth aspect of the present invention, there is provided a hot water supply control system for predicting a power supply amount within each reference time except for the plurality of heat pump water heaters (60a, 60b,...) In the predetermined target area (15). The operation execution unit (58) includes a prediction unit (52) that performs the reference time within the reference time except for the heat pump water heater (60a, 60b,...) Predicted by the prediction unit (52). Within the range of the difference between the supplied power amount and the reference power amount, the boiling operation of some of the water heaters (60a, 60b, ...) to be heated is performed. Features.

  In the fourth aspect of the invention, of the amount of power supplied from the commercial power source to the predetermined target area, the amount of power supplied excluding a plurality of heat pump water heaters, that is, the electric appliance that receives power supply from the commercial power source provided in the predetermined target area The power supplied to the power pump is predicted every reference time, and the difference power between the predicted power supply amount and the upper limit reference power amount is the power amount allowed for the heating operation of the heat pump water heater. And within the range of this difference power, a part of the heating pump water heaters scheduled to be heated are heated, so the amount of power supplied from the commercial power source to the predetermined target area for each reference time is ensured. It is limited to the upper limit power amount or less. Therefore, it is possible to limit the pay-as-you-go fee while keeping the basic fee low.

  A hot water supply control system according to a fifth aspect of the present invention is the hot water supply control system, wherein the operation execution unit (58) includes a part of the number of heat pumps so that an electricity charge for each predetermined period does not exceed a predetermined upper limit value. A boiling operation of the water heater (60a, 60b,...) Is executed.

  In the fifth aspect of the invention, when the electricity charge within the predetermined period exceeds the predetermined upper limit, the heating operation of the heat pump water heater is stopped, so the electricity charge for each predetermined period is predetermined. Exceeding the upper limit of is reliably prevented.

  According to the hot water supply control system of the first aspect of the invention, since the number of operating heat pump water heaters to be heated can be limited in a time zone where the metered charge unit price is high, the total metered charge required for the heating operation of the heat pump water heater. Can be cheaper.

  According to the second aspect of the invention, since the heating operation of the heat pump water heater is executed in order from the time zone close to the current time, the total metered electricity charge can be further reduced.

  According to the third aspect of the invention, since the heating operation of the heat pump water heater with a small amount of heat stored in the hot water storage tank is preferentially executed, it is possible to prevent a shortage of heat storage and a lack of hot water.

  According to the fourth aspect of the present invention, since the amount of power supplied from the commercial power source to the predetermined target area for each reference time can be surely limited to the upper limit power amount or less, the basic fee can be kept low and the metered fee can be reduced. Can be limited to low.

  According to the fifth aspect of the invention, it is possible to reliably suppress the electricity bill for each predetermined period to a predetermined upper limit or less.

FIG. 1 is a schematic configuration diagram of an apartment house provided with a hot water supply control system of the embodiment and a heat pump water heater that is a control target of the hot water supply control system. Drawing 2 is a block diagram of the operation control part of the hot-water supply control system of an embodiment. FIG. 3 is a schematic configuration diagram of a heat pump water heater. FIG. 4 is a graph showing a predicted value (predicted power amount y (n)) of power consumption for each first reference time of electrical equipment other than the heat pump water heater provided in the apartment house. FIG. 5 shows the predicted power consumption (predicted power y (n)) for each first reference time of the electrical equipment other than the heat pump water heater provided in the apartment house and the heating operation of the heat pump water heater. It is a graph which shows electric power amount (DELTA) W which can be utilized. FIG. 6 is a schematic diagram and a mathematical formula of a hot water storage tank showing a calculation method of the heat storage amount of the heat pump water heater. FIG. 7 is a graph showing ranking of heat pump water heaters based on the amount of stored heat. FIG. 8 is a diagram showing a high voltage electricity rate table showing details of a high voltage electricity rate for use of an electric appliance including a plurality of heat pump water heaters in a predetermined target area. FIG. 9 is a flowchart showing the operation of the operation execution unit provided in the operation control unit of the hot water supply control system. FIG. 10 shows the predicted power consumption (predicted power y (n)) for each first reference time and the heating operation of the heat pump water heater for electrical appliances other than the heat pump water heater provided in the apartment house. It is a graph which shows the predicted value (WHp) of the power consumption for every 2nd reference | standard time of a heat pump water heater in the case of performing with priority in the time slot | zone with a low unit charge unit price. FIG. 11 shows the predicted power consumption amount (predicted power amount y (n)) for each first reference time of the electric appliances other than the heat pump water heater provided in the apartment house, and the heating operation of the heat pump water heater. It is a graph which shows the predicted value of the power consumption for every 2nd reference time of the heat pump water heater in the case of performing equally in the time zone with a low unit charge unit price and a high time zone.

  Embodiments of the present invention will be described in detail with reference to the drawings. Note that the embodiments and modifications described below are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

Embodiment 1 of the Invention
A first embodiment of the present invention will be described.

  As shown in FIG. 1, the hot water supply control system (40) of the present embodiment controls the heat pump water heaters (60a, 60b,...) Installed in an apartment house (15) that is a target area. This apartment house (15) is provided with 100 dwelling units (15a, 15b,...). Note that the number of dwelling units (15a, 15b,...) Provided in one apartment house (15) is merely an example. One heat pump water heater (60a, 60b,...) Is installed in each dwelling unit (15a, 15b,...) Of the apartment house (15). Details of the heat pump water heater (60a, 60b,...) Will be described later.

-Power distribution system of apartment houses-
The power distribution system (20) of the apartment house (15) will be described. The power distribution system (20) is provided with a power receiving / transforming facility (21). In this power distribution system (20), the power receiving / transforming equipment (21) is connected to the commercial power source (10) via the trunk line (22), and distributed to each dwelling unit (15a, 15b, ...) via the branch line (23). Connected to electrical boards (24a, 24b, ...). In addition, the power receiving / transforming facility (21) is also connected to an electric appliance (for example, a lighting device in a hallway) installed in the shared section (16). The power receiving / transforming equipment (21) receives high-voltage power (for example, 6600 volts) from the commercial power supply (10), and reduces the received high-voltage power to 100 volts or 200 volts to each dwelling unit (15a, 15b, ...). To supply. In the distribution board (24a, 24b, ...) of each dwelling unit (15a, 15b, ...), electric appliances other than the heat pump water heater (60a, 60b, ...) and the heat pump water heater (60a, 60b, ...) ( 65a, 65b,...) (For example, air conditioners, refrigerators, washing machines, electromagnetic cookers, lighting fixtures, etc.) are connected.

  In addition, the electric appliance described in the following description means what operate | moves by supplying electric power from the power distribution system (20) of an apartment house (15). Accordingly, appliances that operate in a state where they are disconnected from the distribution system (20) using, for example, dry batteries as a power source are not included in the electrical appliances described in the following description.

-Hot water control system configuration-
The hot water supply control system (40) of the present embodiment includes a central server (41) installed outside the apartment house (15), a main watt-hour meter (42) installed in the apartment house (15), and an individual electric energy. (43a, 43b, ...). Only one main electricity meter (42) is installed in the apartment house (15). On the other hand, one individual electricity meter (43a, 43b,...) Is installed in each dwelling unit (15a, 15b,...). The backbone watt-hour meter (42) and the individual watt-hour meters (43a, 43b,...) Are connected to the central server (41) via a communication line (30) such as the Internet. Further, the heat pump water heaters (60a, 60b,...) Of each dwelling unit (15a, 15b,...) Are also connected to the central server (41) via the communication line (30).

  In each dwelling unit (15a, 15b,...), A heat pump water heater (60a, 60b,...) And an individual watt hour meter (43a, 43b,...) Are connected to the HUB / hub (31A, 31B,. The heat pump water heaters (60a, 60b,...) Are connected to the HUBs (31A, 31B,...) Via communication adapters (32a, 32b,...). In each dwelling unit (15a, 15b,...), The HUB (31A, 31B,...) Is connected to the communication line (30) via the router (33a, 33b,...) And the optical line terminator (34a, 34b,. Connected to. The optical line terminators (34a, 34b,...) Mutually convert electrical signals and optical signals. On the other hand, the main electricity meter (42) is directly connected to the communication line (30).

  The backbone watt-hour meter (42) is provided on the trunk line (22) connecting the power receiving / transforming facility (21) to the commercial power source (10). The main electricity meter (42) measures the amount of power supplied from the commercial power supply (10) to the apartment house (15) (that is, the amount of power consumed by the entire apartment house (15)).

  The individual watt hour meters (43a, 43b, ...) are connected to the wiring that connects the distribution boards (24a, 24b, ...) of each dwelling unit (15a, 15b, ...) and the heat pump water heaters (60a, 60b, ...). The The individual watt hour meters (43a, 43b,...) Measure the power consumption of the heat pump water heaters (60a, 60b,...). That is, the individual watt-hour meter (43a) provided in the dwelling unit A (15a) measures the power consumption of the heat pump water heater (60a) provided in the dwelling unit A (15a). The individual watt hour meter (43b) provided in the dwelling unit B (15b) measures the power consumption of the heat pump water heater (60b) provided in the dwelling unit B (15b).

  The central server (41) constitutes an operation control unit (50) for controlling the heat pump water heaters (60a, 60b,...). As shown in FIG. 2, the operation control unit (50) includes a storage unit (51), a power consumption amount prediction unit (52), an upper limit power amount determination unit (53), and a number-of-boilings calculation unit (54). A heat storage amount calculation unit (55), a boiling target selection unit (56), and an operation command unit (57).

  The storage unit (51) has a measured value of the main watt hour meter (42) for each first reference time (30 minutes in the present embodiment) (that is, a heat pump water heater (60a, 60b) provided in the apartment house (15). ), And the measured values of the individual watt hour meters 43a, 43b, ... for each first reference time (i.e., , The actual value of the power consumption of each heat pump water heater (60a, 60b,...) Is stored. The storage unit (51) also stores the amount of heat stored in each heat pump water heater (60a, 60b,...) At each time. The first reference time is equal to the time for measuring the amount of power consumption that is a reference when the electric power company calculates the electricity bill.

  The power consumption predicting unit (predicting unit) (52) is “first standard for electric appliances (65a, 65b,...) Other than the heat pump water heaters (60a, 60b,... The predicted value of “total power consumption per hour” is calculated up to 24 hours ahead from the present time.

  The upper limit power amount determination unit (53) determines the upper limit power amount that is the reference power amount, using the predicted value of the power consumption amount calculated by the power consumption amount prediction unit (52).

  The boiling unit calculation unit (54) uses the predicted value of the power consumption calculated by the power consumption prediction unit (52) and the upper limit power amount determined by the upper limit power amount determination unit (53). The number of heat pump water heaters (60a, 60b,...) To be operated is calculated.

  The heat storage amount calculation unit (55) calculates the heat storage amount of each heat pump water heater (60a, 60b,...).

  The heating target selection unit (56) determines the heat storage amount of each heat pump water heater (60a, 60b, ...) calculated by the heat storage amount calculation unit (55) and the number of units calculated by the number-of-boiling calculation unit (54). Based on this, the heat pump water heater (60a, 60b,...) That performs the boiling operation is selected.

  The operation command section (57) outputs a command signal for causing the heating pump water heater (60a, 60b,...) Selected by the boiling target selection section (56) to perform the boiling operation.

  The operation execution unit (58) receives information from the power consumption amount prediction unit (52), the upper limit power amount determination unit (53), and the number of boiling units calculation unit (54), and heat pump water heaters to be heated ( The operation command section (57) is controlled so that the boiling operation of 60a, 60b,...) Is assigned and executed in each time zone of the second reference time (for example, 2 hours).

-Heat pump water heater-
As shown in FIG. 3, the heat pump water heater (60a, 60b,...) Includes a refrigerant circuit (70) for performing a vapor compression refrigeration cycle and a hot water storage tank (75).

  The refrigerant circuit (70) is a closed circuit in which a compressor (71), a water heat exchanger (72), an expansion valve (73), and an air heat exchanger (74) are sequentially connected by piping. In the refrigerant circuit (70), the water heat exchanger (72) is disposed on the discharge side of the compressor (71), and the air heat exchanger (74) is disposed on the suction side of the compressor (71). The refrigerant circuit (70) is filled with carbon dioxide as a refrigerant.

  The compressor (71) is a rotary or scroll type hermetic compressor (71). The water heat exchanger (72) includes a primary channel (72a) and a secondary channel (72b). In the water heat exchanger (72), the refrigerant circuit (70) is connected to the primary side flow path (72a), and the water circuit (76) described later is connected to the secondary side flow path (72b). The water heat exchanger (72) exchanges heat between the water flowing through the secondary channel (72b) and the refrigerant flowing through the primary channel (72a). The expansion valve (73) is a so-called electronic expansion valve (73). The air heat exchanger (74) causes the refrigerant flowing through the refrigerant circuit (70) to exchange heat with outdoor air supplied by an outdoor fan (not shown).

  The hot water storage tank (75) is a cylindrical container installed in a standing state. The volume of the hot water storage tank (75) is, for example, about 300 to 500 liters. A water circuit (76) is connected to the hot water storage tank (75). The water circuit (76) has one end connected to the vicinity of the lower end of the hot water storage tank (75) and the other end connected to the vicinity of the upper end of the hot water storage tank (75). The water circuit (76) is connected to the secondary flow path (72b) of the water heat exchanger (72) and the pump (77). The pump (77) is disposed upstream of the water heat exchanger (72).

  A water supply pipe (78) and a hot water discharge pipe (79) are connected to the hot water storage tank (75). The water supply pipe (78) is connected near the lower end of the hot water storage tank (75) and supplies tap water to the hot water storage tank (75). The hot water outlet pipe (79) is connected to the vicinity of the upper end of the hot water storage tank (75), and sends out hot water in the hot water storage tank (75) toward a hot water tap or a bath.

  The hot water storage tank (75) is provided with six temperature sensors (80 to 85). These six temperature sensors (80 to 85) are arranged at equal intervals in the vertical direction of the hot water storage tank (75). The temperature sensor (80) is installed at the upper end of the hot water storage tank (75), and the temperature sensor (85) is installed at the lower end of the hot water storage tank (75).

<Boiling operation>
The heat pump water heater (60a, 60b,...) Performs a boiling operation. During the boiling operation, the compressor (71) and the pump (77) operate.

  During the boiling operation, the refrigerant circulates through the refrigerant circuit (70) and a refrigeration cycle is performed. Specifically, the refrigerant discharged from the compressor (71) flows into the primary flow path (72a) of the water heat exchanger (72) and radiates heat to the water flowing through the secondary flow path (72b). The refrigerant after heat dissipation expands when passing through the expansion valve (73), then flows into the air heat exchanger (74), absorbs heat from the outdoor air, and evaporates. The refrigerant that has passed through the air heat exchanger (74) is sucked into the compressor (71) and compressed.

  During the boiling operation, water flows through the water circuit (76). The pump (77) sucks in water at a relatively low temperature (for example, about 20 ° C.) existing at the bottom of the hot water storage tank (75) and discharges it toward the secondary flow path (72b) of the water heat exchanger (72). To do. The water flowing into the secondary side flow path (72b) of the water heat exchanger (72) is heated by the refrigerant flowing through the primary side flow path (72a), and is heated to a relatively high temperature (for example, about 80 ° C.) Become. The high temperature water flowing out from the water heat exchanger (72) is supplied to the upper part of the hot water storage tank (75).

  The hot water storage tank (75) is always full with the interior space filled with water. In the hot water storage tank (75), as the amount of the stored high temperature water increases, the region where the high temperature water exists expands downward. And when the hot water of about 80 ° C. is also present at the lower end of the hot water storage tank (75), the heat pump water heater (60a, 60b,...) Judges that the boiling has been completed and the boiling operation is completed. Exit. Specifically, when the measured value of the temperature sensor (85) disposed at the lowest level reaches a target value (for example, 80 ° C.), the heat pump water heater (60a, 60b,...) Judging that it is filled with water, the boiling operation is finished.

-Control action of operation control section-
The control operation performed by the operation control unit (50) of the hot water supply control system (40) will be described with reference to FIGS.

  In this operation control unit (50), the power consumption prediction unit (52), the upper limit power amount determination unit (53), the number of heating units calculation unit (54), the heat storage amount calculation unit (55), the boiling The target selection unit (56) and the operation command unit (57) perform predetermined operations in order. Power consumption prediction unit (52), upper limit electric energy determination unit (53), number of heating units calculation unit (54), heat storage amount calculation unit (55), heating target selection unit (56), and operation command unit (57 ) Is a selection operation, and is repeated every time the second reference time (2 hours in the present embodiment) elapses. That is, the operation control unit (50) selects “the heat pump water heater (60a, 60b,...) That performs the boiling operation and executes the boiling operation for the selected heat pump water heater (60a, 60b,...). Is performed every 2 hours. Note that 2 hours (= 120 minutes), which is the second reference time of the present embodiment, is an integer multiple of 30 minutes (= 0.5 hours), which is the first reference time of the present embodiment.

<Storage unit>
The storage unit (51) stores main data necessary for the operation control unit (50) to perform a control operation.

  As described above, the storage unit (51) stores the measured values of the basic watt hour meter (42) and the individual watt hour meters (43a, 43b,...) For each first reference time (30 minutes in the present embodiment). To do. That is, the storage unit (51) measures the measured values (Wt (n), n (evaluation) of the main watt-hour meter (42) for each of the 48 evaluation periods divided into 30 minutes each day (24 hours). (Time zone number) = 1 to 48) and measured values (Wi (n, m), evaluation time zone of individual watt hour meters (43a, 43b, ...) provided in each dwelling unit (15a, 15b, ...) Number: n = 1-48, dwelling unit number: m = 1-100).

  Further, the storage unit (51) is configured to change each individual watt hour meter (43a, 43b,... In each evaluation time zone from “measured value (Wt (n)) of the main watt hour meter (42) in each evaluation time zone”. ) Of the measured values (Wi (n, m)) (Wit (n) = Wi (n, 1) + Wi (n, 2) + Wi (n, 3) + ... + Wi (n, 100)) The value obtained by subtracting “(Wo (n) = Wt (n) −Wit (n), n (number of evaluation time zone) = 1 to 48)” is stored.

  As described above, the measured value (Wt (n)) of the main watt-hour meter (42) in each evaluation time zone indicates the power consumption of the entire apartment house (15) in each evaluation time zone. In addition, the total of the measured values (Wi (n, m)) of all the individual watt-hour meters (43a, 43b,...) In each evaluation time zone is the heat pump water heater (60a) provided in the apartment house (15). , 60b, ...) indicates the total power consumption for each evaluation time period. Accordingly, from the “measured value (Wt (n)) of the main watt-hour meter (42) in each evaluation time zone” to the “measured value (Wi () of each individual watt-hour meter (43a, 43b,...) In each evaluation time zone”. n, m)) minus the total (Wit (n)) ”(Wo (n)) is an electric appliance other than the heat pump water heater (60a, 60b,... “The total value of the power consumption of each of the other electrical appliances (65a, 65b,...) In each evaluation time zone”.

  The storage unit (51) stores the above-described values Wt (n), Wi (n, m), Wit (n), Wo (n) for a past predetermined period (for example, the past one week). The storage unit (51) also stores the amount of heat stored in each heat pump water heater (60a, 60b,...) At each time. The heat storage amount of each heat pump water heater (60a, 60b,...) Is calculated by a heat storage amount calculation unit (55) described later.

  Further, the storage unit (51) stores in advance a high-voltage electricity bill shown in FIG. This tariff is an electricity tariff provided individually to this apartment house (15) by a high-voltage supply company that has signed a contract to receive high-voltage power. For example, the tariff from July 1 to September 30 in summer It is a charge schedule applied to. In this price list, the basic charge is clearly specified. This basic charge is calculated based on the maximum demand power among the demand power for each reference time (30 minutes) in the apartment house (15) for the past one year, for example. In addition, the electricity charge table clearly shows the pay-per-use charge per kWh. This pay-as-you-go fee is divided into three types of time zones, the highest from 10 am to 5 pm, which is heavy load time, and the cheapest from 10 pm to 8 am, which is night time. Intermediate charges excluding night time are from 8am to 10am and from 5pm to 10pm.

<Power consumption prediction unit>
The power consumption amount prediction unit (52) performs a prediction operation for predicting a predetermined power consumption amount. Specifically, the power consumption prediction unit (52) is an electric appliance (other electric appliances (65a, 65b, ...)) other than the heat pump water heaters (60a, 60b, ...) provided in the apartment house (15). Is estimated for each evaluation time period (30 minutes) from the present time to the time point 24 hours ahead. In other words, for example, assuming that the current time is 0 minutes before, the power consumption prediction unit (52) classifies 0:00 to 24:00 on the current day into evaluation time zones every 30 minutes, The total value Wo (n) is predicted. FIG. 4 is a graph showing a result of prediction by the power consumption amount prediction unit (52) based on 0 o'clock.

  First, the power consumption amount prediction unit (52) uses the data stored in the storage unit (51) to calculate the past value of the total power consumption Wo (n) of the other electric appliances (65a, 65b,...). The average value Wom (n) for one week is calculated. Then, the power consumption prediction unit (52) uses the following formula 1 to predict the predicted power that is the predicted value of the “total power consumption Wo (n) of other electrical appliances (65a, 65b,...)”. The quantity y (n) is calculated. That is, the power consumption amount prediction unit (52) calculates 48 predicted power amounts (y (1) to y (48)).

y (n) = a (n) * y (n-1) + b (n) * Wom (n) + c (n) * C (n) + N (n) (Formula 1)
Formula 1 is a prediction formula obtained by performing multiple regression analysis on the past “total power consumption Wo (n) of other electrical appliances (65a, 65b,...)”. In Equation 1, a (n), b (n), and c (n) are predetermined coefficients for each evaluation time zone. C (n) in Formula 1 is a value indicating a day characteristic (characteristic of the day), and for example, “day before holiday”, “holiday”, and “day before weekday” are different values. N (n) in Equation 1 is an intercept.

  Y (n-1) is a predicted value of “total power consumption Wo (n) of other electric appliances (65a, 65b,...)” In the evaluation time zone immediately before the evaluation time zone to be calculated. is there. Therefore, for example, when calculating the predicted power amount y (x) in the evaluation time zone from 5:00 to 5:30, the predicted power amount y (x-1) in the evaluation time zone from 4:30 to 5:00 is calculated. Used. For example, in the case of calculating the predicted power amount at 0:00, when calculating the predicted power amount y (1) in the evaluation time zone from 0:00 to 0:30, the evaluation from 23:30 to 24:00 on the previous day is performed. “Total power consumption Wo (48) of other electric appliances (65a, 65b,...)” In the time zone is used as y (0).

<Upper limit energy determination unit>
The upper limit power amount determining unit (53) performs an upper limit setting operation for determining the upper limit power amount Wu. The operation of the upper limit power amount determination unit (53) is performed after the operation of the power consumption amount prediction unit (52) described above is completed.

  First, the upper limit electric energy determination unit (53) calculates an average value Wtm of the electric energy consumption of the entire apartment house (15) for 24 hours. In order to calculate the average value Wtm, the upper limit power amount determination unit (53) firstly calculates the total value yt (= y (1) + y) of the predicted power amount y (n) calculated by the power consumption amount prediction unit (52). (2) + ... + y (48)) is calculated. In addition, the upper limit power amount determination unit (53) stores in advance a predicted value yh of the total value of the power consumption amount of each heat pump water heater (60a, 60b,...) In one day. Then, the upper limit electric energy determining unit (53) calculates the average value Wtm by dividing the sum of the total value yt and the predicted value yh by the number of evaluation time zones (48 in this embodiment) (Wtm = ( yt + yh) / 48).

  It should be noted that the predicted value yh of the total power consumption amount of each heat pump water heater (60a, 60b,...) In one day is a value calculated as follows. One heat pump water heater (60a, 60b, ...) changes from a state where there is no hot water (for example, 80 ° C hot water) in the hot water storage tank (75) to a state where the hot water storage tank (75) is filled with high temperature water. The amount of power consumption when the boiling operation is performed for 8 hours until it becomes can be calculated in advance. This power consumption is assumed to be the daily power consumption of one heat pump water heater (60a, 60b,...). Then, the power consumption per day of one heat pump water heater (60a, 60b,...) Is multiplied by the number of heat pump water heaters (60a, 60b,...) (100 in this embodiment). A predicted value yh of the total power consumption amount of each heat pump water heater (60a, 60b,...) In the day is obtained.

  Then, the upper limit power amount determination unit (53) calculates the maximum value of the predicted power amount y (n) calculated by the power consumption amount prediction unit (52) and the power consumption amount of the entire apartment house (15) until 24 hours later. Is compared with the average value Wtm, and the larger one is defined as the upper limit electric energy Wu.

  For example, in the case of FIG. 4, the predicted power amount y (38) = 108 kW in the evaluation time zone from 18:30 to 19:00 is the maximum. Then, when the average value Wtm of the power consumption of the entire 24-hour apartment house (15) is 115 kW (see the alternate long and short dash line in the figure), the upper limit power amount determination unit (53) sets the upper limit power amount Wu to 115 kW. Set to. On the other hand, when the average value Wtm of the entire 24-hour apartment house (15) is 95 kW (see the broken line in the figure), the upper limit electric energy determining unit (53) sets the upper limit electric energy Wu to 108 kW. Set.

<Boiling unit calculation unit>
The number-of-boiling calculation unit (54) performs a calculation operation for calculating the number of heat pump water heaters (60a, 60b,...) That perform the boiling operation. The operation of the number-of-boiling-unit calculation unit (54) is performed after the operation of the upper limit electric energy determining unit (53) is completed.

  The number-of-boilers calculation unit (54) calculates the number of heat pump water heaters (60a, 60b,...) That perform the boiling operation until the second reference time (2 hours in the present embodiment) elapses from now. To do.

  Here, the operation of the number-of-boiling calculation unit (54) will be described by taking as an example the case of calculating the number of heat pump water heaters (60a, 60b,...) That perform the boiling operation for 2 hours from 0 to 2 o'clock. This will be described with reference to FIG. Note that the predicted power consumption y (n) calculated by the power consumption prediction unit (52) shown in FIG. 5 is the same as that shown in FIG.

  First, the number-of-boiling calculation unit (54) compares the predicted power amounts y (1) to y (4) in the four evaluation time zones from 0 o'clock to 2 o'clock, and selects the largest one. In FIG. 5, the largest of the predicted power amounts y (1) to y (4) is the predicted power amount y (1) in the evaluation time zone from 0:00 to 0:30.

  Next, the number-of-boiling calculation unit (54) calculates the difference ΔW () between the upper limit power amount Wu determined by the upper limit power amount determination unit (53) and the maximum predicted power amount y (1) from 0:00 to 2:00. = Wu-y (1)) is calculated. The remaining predicted power amounts y (2) to y (4) from 0:00 to 2:00 are smaller than the predicted power amount y (1). Therefore, if the power consumption of the heat pump water heater (60a, 60b,...) Is less than ΔW, the power consumption of the entire apartment house (15) in each evaluation time zone from 0 o'clock to 2 o'clock is the upper limit power. The amount is less than Wu.

  In other words, ΔW is the boiling point of the heat pump water heater (60a, 60b,...) Within the range where the power consumption of the entire apartment house (15) in each evaluation time zone from 0 o'clock to 2 o'clock is less than the upper limit electric energy Wu. Indicates the amount of power that can be used for lifting operation.

  Therefore, the number-of-boiling calculation unit (54) performs the heating operation so that the total power consumption of the heat pump water heaters (60a, 60b,...) That performs the heating operation is ΔW or less. The number of units (60a, 60b,...) Is calculated.

  Specifically, the heating unit calculation unit (54) calculates the difference ΔW between the upper limit electric energy Wu and the predicted electric energy y (1) by the consumption per unit time of one heat pump water heater (60a, 60b, ...). By dividing by the electric energy Whp, the number Nhp of the heat pump water heaters (60a, 60b,...) That perform the boiling operation is calculated. In the example shown in FIG. 5, the upper limit electric energy Wu = 108 kW and the predicted electric energy y (1) = 50 kW in the evaluation time zone from 0 o'clock to 0:30, so ΔW = 58 kW. And, assuming that the power consumption per unit time Whp = 1.8 kW of one heat pump water heater (60a, 60b,...), ΔW / Whp = 32.22. The unit (54) sets the number Nhp of the heat pump water heaters (60a, 60b,...) That perform the boiling operation to 32.

<Heat storage calculation unit>
The heat storage amount calculation unit (55) performs an operation (heat storage amount calculation operation) for individually calculating the heat storage amount of each heat pump water heater (60a, 60b,...) Provided in the apartment house (15). The heat storage amount calculation unit (55) acquires the measurement value of the temperature sensor (80 to 85) provided in the hot water storage tank (75) of each heat pump water heater (60a, 60b, ...), and acquires the acquired temperature sensor (80 ˜85), the amount of heat stored in the hot water storage tank (75) of each heat pump water heater (60a, 60b,...) Is calculated.

  The operation in which the heat storage amount calculation unit (55) calculates the heat storage amount of the hot water storage tank (75) of one heat pump water heater (60a) will be described with reference to FIG.

  As shown in FIG. 6, in the hot water storage tank (75), six temperature sensors (80 to 85) are installed at equal intervals in the height direction of the hot water storage tank (75). The uppermost temperature sensor (80) is installed at the upper end of the hot water storage tank (75), and the lowermost temperature sensor (85) is installed at the lower end of the hot water storage tank (75). For this reason, the internal space of the hot water storage tank (75) is divided into five areas (A1 to A5) sandwiched between two temperature sensors (80 to 85) that are vertically adjacent to each other.

  The heat storage amount calculation unit (55) uses the measured values (T0 to T5) of the temperature sensors (80 to 85) provided in the hot water storage tank (75) to be calculated and the mathematical formula shown in FIG. Calculate the heat storage amount Q (m) of (75) (unit number: m = 1 to 100). That is, the heat storage amount calculation unit (55) sets the heat amount of 45 ° C. or more in the hot water storage tank (75) as the heat storage amount Q (m) of the hot water storage tank (75). Vk is the volume of area Ak, ρk is the density of water at temperature Tk, and ck is the specific heat of water at temperature Tk.

  For example, the measured values (T0 to T2) of the upper three temperature sensors (80 to 82) are 45 ° C. or higher, and the measured values (T3 to T5) of the lower three temperature sensors (83 to 85) are less than 45 ° C. In this case, ΔT1 = T1-45, ΔT2 = T2-45, ΔT3 = ΔT4 = ΔT5 = 0 (zero). Therefore, in this case, the heat storage amount Q (m) of the hot water storage tank (75) of each heat pump water heater (60a, 60b,...) Is calculated by the following formula 2.

Q (m) = ρ1c1V1ΔT1 + ρ2c2V2ΔT2 (Formula 2)
The heat storage amount calculation unit (55) individually calculates the heat storage amount Q (m) of each hot water storage tank (75) for all the heat pump water heaters (60a, 60b, ...) provided in the apartment house (15). To do.

<Boiling target selection section>
The boiling target selection unit (56) performs an operation of selecting a heat pump water heater (60a, 60b,...) Provided in the apartment house (15) to perform the boiling operation. The operation of the boiling target selection unit (56) is performed after the operation of the number-of-boiling calculation unit (54) and the operation of the heat storage amount calculation unit (55) are completed.

  First, the boiling target selection unit (56) compares the heat storage amount Q (m) of each heat pump water heater (60a, 60b,...) Calculated by the heat storage amount calculation unit (55). Then, as shown in FIG. 7, the heating target selecting unit (56) reduces all the heat pump water heaters (60a, 60b,...) Provided in the apartment house (15) with a small amount of heat storage Q (m). Rank in order.

  Next, the boiling target selection unit (56) is calculated by the boiling unit calculation unit (54) from the ranked heat pump water heaters (60a, 60b,...) Having the smallest amount of stored heat Q (m). The heat pump water heaters (60a, 60b,...) Corresponding to the number Nhp are selected as the heat pump water heaters (60a, 60b,...) That perform the boiling operation. That is, in the above example in which the number Nhp calculated by the number-of-boiling calculation unit (54) is 32, the heating target selection unit (56) is ranked in order of decreasing heat storage amount Q (m). The first to thirty-second heat pump water heaters (60a, 60b,...) Of the heaters (60a, 60b,...) Are heat pump water heaters (60a, 60b,...) That perform the boiling operation.

  In this way, the boiling target selection unit (56) performs heat pump water heaters (60a, 60b) that preferentially perform the heating operation of the heat pump water heaters (60a, 60b,...) With a small heat storage amount Q (m). , ...).

<Operation command section>
The operation command unit (57) is the one selected by the heating target selection unit (56) for the heating operation among the heat pump water heaters (60a, 60b, ...) provided in the apartment house (15), A command signal for executing the boiling operation is output. In the case of the above example, the operation command unit (57) outputs a command signal to the 32 heat pump water heaters (60a, 60b,...) Selected by the boiling target selection unit (56). The command signal output from the operation command unit (57) is sent to the target heat pump water heater (60a, 60b,...) Through the communication line (30).

  The heat pump water heater (60a, 60b,...) That has received the command signal from the operation command unit (57) starts the boiling operation, and the second reference time (2 hours in the present embodiment) from the start of the boiling operation. Or the hot water storage tank (75) is filled with high temperature water of about 80 ° C. (specifically, the measured value T5 of the temperature sensor (85) disposed at the lowermost level reaches 80 ° C.) The heating operation is continued until).

<Operation execution part>
The operation execution unit (58) reads the number of boiling units and the heating target of the heat pump water heaters (60a, 60b,...) Calculated by the boiling number calculating unit (54) and the heating target selecting unit (56). In addition, the unit price unit price of the high-voltage electricity rate table stored in the storage unit (51) is read, and each time zone for each second reference time (2 hours) divided into a plurality of days based on such information The heat pump water heaters (60a, 60b,...) That perform the boiling operation are managed, and the operation command unit (57) is controlled to actually execute the boiling operation.

  Hereinafter, specific management and control of the operation execution unit (58) will be described with reference to FIG.

  In FIG. 9, in step S1, the power consumption Wo (n) predicted by the power consumption prediction unit (52) every first reference time (30 minutes), that is, the heat pump provided in the apartment house (15). Obtains the predicted value Wo (n) for each evaluation time zone (30 minutes) from the present time to 24 hours ahead of the power consumption of the electric appliances (65a, 65b, ...) other than the water heater (60a, 60b, ...) To do.

  Subsequently, in step S2, the total power consumption consumed by the plurality of heat pump water heaters (60a, 60b,...) In the apartment house (15) from the present time to 24 hours ahead is predicted. This prediction is based on, for example, the power consumption Eave (m) (m = 1) for the second reference time (2 hours) of the plurality of heat pump water heaters (60a, 60b,...) In the housing complex (15) for the past week. ~ 24) are measured and stored, and the total power consumption of these power consumption Eave (m) for each second reference time (2 hours) is calculated as a plurality of heat pump water heaters (15) in the apartment house (15). 60a, 60b, ...) is predicted as the total power consumption up to 24 hours ahead.

  Then, in step S3, the time zone with the lowest electricity price is acquired from the high voltage electricity price table of FIG. 8 stored in advance in the storage unit (51). In this high-voltage electricity tariff, each time zone from 10 pm to 8 am at night time is acquired. Furthermore, in step S4, the time zone from the time zone closest to the present time to the second reference time (2 hours) is obtained from 10 pm to 8:00 am in the time zone when the electricity price is cheapest. For example, if the current time is 2 pm, the time zone from 10 pm to midnight is acquired.

  Then, in step S5, the heating operation of the heat pump water heaters (60a, 60b) scheduled to be heated is assigned in order from the most recent time zone in which the acquired metered charge unit price is low. This allocation is performed so as not to exceed the upper limit power amount (Wu) determined by the upper limit power amount determination unit (53). Specifically, as described above, the number-of-boiling calculation unit (54) calculates the number (Nhp) of the heat pump water heaters (60a, 60b,...) To be heated for each time zone (2 hours). Heat pump hot water to be heated in this time zone in the time zone from the most recently acquired time zone to the second reference time (2 hours) (in the above example, the time zone from 10:00 pm to 12:00 pm) The heating operation of the number of heating units (Nhp) of the units (60a, 60b,...) Is assigned. The heating operation number (Nhp) of the water heaters (60a, 60b,...) Calculated in this example is explained in the time zone from 10:00 pm to midnight in the above example. Of the amount (Wu) and the predicted value Wo (21) to Wo (24) of the average value for the past week from 10 pm to 12 pm for electrical appliances other than the heat pump water heater (60a, 60b, ...) The difference power ΔW from the maximum value is calculated, and this difference power ΔW is divided by the power consumption (Whp) per first reference time (30 minutes) of one heat pump water heater (60a, 60b, ...). Therefore, the heating operation of the heat pump water heaters (60a, 60b,...) Of the number of heating operations (Nhp) is assigned to be performed in the time zone from 10 pm to 12 pm. For example, during this time from 10:00 pm to 12:00 pm, all the electric power including a plurality of heat pump water heaters (60a, 60b,...) Power consumption of the device is more than the above upper electric energy (Wu).

  After that, in step S6, the total power consumption required for the heating operation of the heating pump water heaters (60a, 60b,...) Of the number of heating operation execution units (Nhp) assigned in the most recent time zone where the metered unit price is low. Calculate (Whpa). Specifically, this calculation is performed by multiplying the power consumption amount Whp per unit time of one heat pump water heater (60a, 60b,...) By the number of heating operations (Nhp). The total power consumption (Whpa) is compared with the total power consumption (WThp) of the plurality of heat pump water heaters (60a, 60b,...) In the apartment house (15) predicted in step S2, and the calculated consumption. The total metered charge (Ft) corresponding to the total value (Whpa) of electric power is compared with a predetermined upper limit value (Fu). This predetermined upper limit (Fu) is, for example, the maximum per day that is obtained by dividing the metered rate part that constitutes the maximum electricity rate in the electricity rate for each month in the past year by the number of days in the month that became the maximum rate. It is a pay-as-you-go fee. If WThp> Whpa and Fu> Ft, the process returns to step S3 and subsequent steps and the above operation is repeated. That is, the time period in which the metered charge unit price is low is acquired again. In the above example, the second reference time (2 hours) is from midnight to 2 am, 2 am to 4 am, 4 am to 6 am, 6 am to 8 am Since the four pay-as-you-go unit prices are cheap, the next time zone closest to the current time is acquired so that the heating operation of the heat pump water heaters (60a, 60b,...) Is performed quickly. In the above example, the time period from midnight to 2 am is acquired. Then, in this time zone, the boiling operation of the number of heating operations (Nhp) of the water heaters (60a, 60b,...) In this time zone calculated by the boiling number calculation unit (54) is assigned. Then, the total value (Whpa) of the power consumption required for the heating operation in the current time zone and the power consumption required for the heating operation in the previous time zone in the apartment house (15) predicted in step S2 above. Compared with the total daily power consumption (WThp) of a plurality of heat pump water heaters (60a, 60b,...), The total metered charge (Ft) is compared with the upper limit value (Fu), and WThp ≦ Whpa or Fu ≦ When it becomes Ft, the allocation of the heating operation of the heat pump water heater (60a, 60b,...) To each time zone is finished.

  As described above, the operation execution unit (58) heats up the heat pump water heaters (60a, 60b,...) Of the number of heating operation execution units (Nhp) every second reference time (2 hours). Assign driving. Further, the operation execution unit (58) is a heat pump water heater selected by the heating target selection unit (56) as a heat pump water heater (60a, 60b,...) That actually performs the boiling operation in each time zone. Select (60a, 60b, ...). That is, the heating target selecting unit (56) preferentially executes the heating operation of the heat pump water heater (60a, 60b, ...) with a small amount of heat storage Q (m) (60a, 60b, ...). Therefore, the operation execution unit (58) sets the time zone of the second reference time (2 hours) closest to the current time, for example, if the current time is 8:00 pm, from 8:00 pm to 10:00 pm As the heat pump water heaters (60a, 60b,...) Of the number of heating operations (Nhp) (for example, 32 units) that actually perform the boiling operation during the time period, 32 heat pumps with a small heat storage amount Q (m) Select the water heater (60a, 60b, ...) and then perform the boiling operation in the time zone closest to the current time (time zone from 10 pm to midnight) ( Nhp) (for example, 15 units) heat pump water heaters (60a, 60b,...), And then 15 heat pumps with the least amount of heat storage Q (m) Water heater (60a, 60b, ...) to select a.

  Thereafter, the operation execution unit (58) controls the operation command unit (57), and the operation command unit (57) executes the heating operation preferentially assigned to each of the above time zones. A command signal for executing the boiling operation is output to the (Nhp) heat pump water heater (60a, 60b,...) At the time zone.

<Specific examples of allocation of hot water heaters to each time zone>
The allocation of the heating operation of the heat pump water heaters (60a, 60b,...) Based on the flowchart of FIG. 9 to each time zone will be specifically described.

  A description will be given based on FIG. 10 assuming that the current time is, for example, 2:00 pm. In FIG. 10, a predicted value (predicted power amount) y (n) of the total power consumption Wo (n) ”of the electric appliances (65a, 65b,...) Other than the heat pump water heater (60a, 60b,...). Exemplifies a case different from FIG.

  From the high-voltage electricity tariff chart in FIG. 8, the time zone with the lowest unit price is the time zone from 10:00 pm to 8:00 pm night time, so the most recent second reference time (2 hours) from 10:00 pm With respect to the time zone up to midnight, the heating unit calculation unit (54) performs the heating operation of the heating pump water heaters (60a, 60b,...) Of the heating operation number (Nhp) calculated for this time zone. Assign. The power consumption required for the boiling operation in this time zone is denoted as Whp22-24 in FIG.

  Subsequently, for the time zone from midnight to 2:00 am during night time, the number of heating operation units (54) calculated by the heating unit calculation unit (54) for the heating operation water heater (60a, 60b,...) Is assigned to the heating operation, and the power consumption Whp1-4 required for the heating operation is assigned during this time period. Similarly, the number of heating units is calculated for the night time from 2 am to 4 am, from 4 am to 6 am, and from 6 am to 8 am (54) assigns the boiling operation of the heat pump water heaters (60a, 60b, ...) of the number of boiling operation execution numbers (Nhp) calculated for these time zones, and the heating operation is performed in those time zones. Allocate required power consumption Whp5-8, Whp9-12, Whp13-16.

  Next, the time when electricity consumption is cheap is from 8am to 10am and 5pm to 10pm, the middle time, so the next most recent time is 8am to 10am, and From 6:00 pm to 8:00 pm, the heating operation of the heating pump water heaters (60a, 60b,...) Of the number of boiling operation execution units (Nhp) calculated by the heating unit calculation unit (54) for these time zones is performed. The power consumption Whp17-20 and Whp37-40 required for the boiling operation are allocated in these time zones.

  And power consumption Whp22-24, Whp1-4, Whp5-8, Whp9-12, Whp13-16, Whp17-20 in each time zone assigned to the heating operation of the heat pump water heater (60a, 60b, ...) , The total value of Whp37-40 exceeds the daily expected total power consumption (WThp) of multiple heat pump water heaters (60a, 60b, ...) in the apartment house (15), or the total metered charge (Ft) is When the upper limit (Fu) is exceeded, the allocation of the heating operation of the heat pump water heaters (60a, 60b, ...) is terminated.

<Effect of this embodiment>
As described above, in this embodiment, the electric power other than the upper limit electric energy (Wu) and the plurality of heat pump water heaters (60a, 60b,...) Of the apartment house (15) for each second reference time (2 hours). Within the range of power difference ΔW from the maximum predicted power consumption y (n) of the appliance, the number of heating pump water heaters (60a, 60b,. ) And the heating operation of the heat pump water heaters (60a, 60b, ...) of the number of running operations (Nhp) at each second reference time (2 hours) is Since it is assigned and executed with priority, the hot water heaters (60a, 60b, 60b, 60b, It becomes difficult to assign the boiling operation of (...). Therefore, for example, as shown in FIG. 11, compared to the case where the heating operation of the heat pump water heater (60a, 60b,...) Is also assigned to the heavy load time with a high metered charge unit price, The total metered electricity charge required for the heating operation of the plurality of heat pump water heaters (60a, 60b,...) Can be reduced.

  Furthermore, in the high-voltage electricity tariff of FIG. 8, taking night time as an example, the second reference time (2 hours) is 10 to 12 pm, 0:00 to 2 am, and 2 am to 2 am There are multiple time zones from 4:00 am to 6:00 am and from 6:00 am to 8:00 am as the same time zone with the same unit price. In this case, the heat pump water heater (60a, 60b, The heating pump water heaters (60a, 60b, ...) are preferentially assigned to the time zone where the boiling operation of (...) is executed earlier, so that Thus, the frequency and probability that the heating operation of the water heaters (60a, 60b,...) Is assigned is reduced, and the total metered electricity bill can be further reduced.

  In addition, the heat pump water heaters (60a, 60b,...) With a small amount of livestock heat stored in the hot water storage tank (75) are assigned with priority over the time zone in which the boiling operation is performed early, so the hot water storage tank with a low amount of livestock heat is allocated. It is possible to store heat to (75) at an early stage to prevent insufficient heat storage and running out of hot water.

  In addition, the maximum predicted power consumption y (n) and upper limit power consumption of electrical appliances other than the multiple heat pump water heaters (60a, 60b, ...) in the apartment house (15) at each second reference time (2 hours) Within the range of power difference (ΔW) from (Wu), calculate the number of heating operation (Nhp) of the heat pump water heaters (60a, 60b, ...) for each second reference time (2 hours) Therefore, within each second reference time (2 hours), the total power consumption of all electric appliances including heat pump water heaters (60a, 60b, ...) in the apartment house (15) is the upper limit electric energy (Wu) The following can be surely suppressed.

  Further, the heating operation of the heat pump water heaters (60a, 60b,...) Is executed with the number of units being limited so that the total metered charge (Ft) for one day (predetermined period) does not exceed the upper limit value (Fu). Therefore, it is possible to reliably reduce the electricity charge required for the heating operation of the heat pump water heater (60a, 60b,...).

<< Other Embodiments >>
In the above embodiment, the first reference time is 30 minutes and the second reference time is 2 hours. However, these reference times are merely examples, and various times can be adopted. Moreover, the predicted value of the total power consumption of the electric appliances (65a, 65b, ...) other than the heat pump water heaters (60a, 60b, ...) is predicted for each first reference time, and the heat pump water heaters (60a, 60b, ...) are predicted. ) Is the second reference time, but the first reference time is unified with the second reference time (2 hours), or the second reference time is the first reference time (30 minutes) Or the first and second reference times may be unified to another time (for example, one hour).

  Furthermore, in the said embodiment, although the high voltage | pressure electricity bill was shown in FIG. 8, this high voltage | pressure electricity bill is an illustration. Accordingly, the usage fee is not limited to three time zones, but may be two time zones or four or more time zones. In addition, in the case of a fee structure in which the electricity rate is changed every season, every month or every day without being limited to the rate table limited to the summer season, the electricity rate table for each season, month or day is stored in the storage unit. (51) may be stored in advance.

  In addition, in the above embodiment, regarding the allocation to each time zone of the heating operation of the heat pump water heater (60a, 60b,...) Scheduled to be heated up, in order from the time zone with the lowest unit price unit price in the high-voltage electricity tariff. Although the present invention is assigned, the present invention is not limited to this, and for example, it may be assigned from each time zone of an intermediate time (from 8 am to 10 am and from 5 pm to 10 pm) in the rate table of FIG. Boil the heat pump water heaters (60a, 60b,…) that are scheduled to be heated in preference to the time periods where the unit price is lower than the hours where the unit price is high Allocate driving.

  Further, in each of the above embodiments, one apartment house (15) is the target area, but a plurality of apartment houses may be the target area, or a predetermined area where a plurality of detached houses exist is the target area. It is good.

  Furthermore, in the hot water supply control system (40) of each of the above embodiments, the power consumption prediction unit (52) of the operation control unit (50) uses the prediction formula (Formula 1) obtained by the multiple regression analysis to predict the power consumption. Although the amount y (n) is calculated, the predicted power amount y (n) may be calculated using other methods. For example, the power consumption amount prediction unit (52) determines a past predetermined period (for example, one total power consumption amount Wo (n) of other electric appliances (65a, 65b,...)) For each evaluation time period. Weekly) arithmetic average may be calculated, and the calculated average value may be used as the predicted electric energy y (n) in each evaluation time zone.

  As described above, the present invention is useful for a hot water supply control system that controls a plurality of heat pump water heaters.

10 Commercial power supply 15 Apartment house (target area)
40 Hot Water Supply Control System 50 Operation Control Unit 51 Storage Unit 52 Power Consumption Prediction Unit (Prediction Unit)
53 Upper limit power amount determination unit 54 Number of boiling units calculation unit 55 Heat storage amount calculation unit 56 Heating target selection unit 57 Operation command unit 58 Operation execution unit 60a, 60b ... Heat pump water heater 75 Hot water storage tank

Claims (5)

A hot water supply control system for controlling a plurality of heat pump water heaters (60a, 60b, ...) each having a hot water storage tank (75),
Among the plurality of heat pump water heaters (60a, 60b, ...), a predetermined target including a plurality of heat pump water heaters (60a, 60b, ...) from a commercial power source (10) for boiling water heaters to be heated Execute in preference to the time period in which the pay-per-unit charge of the power for each time period divided into multiple days is within the range where the power supply amount to the area (15) is less than or equal to the reference power amount A hot water supply control system comprising an operation execution unit (58). In the hot water supply control system according to claim 1,
The operation execution unit (58)
A hot water supply control system characterized by giving priority to the time zone on the side where the boiling operation of the water heater is performed earlier in the time zone where the unit price of electricity is the same. In the hot water supply control system according to claim 1 or 2,
The operation execution unit (58)
Among the heat pump water heaters (60a, 60b,...) Scheduled to be heated, a hot water supply control system is characterized by giving priority to the boiling operation of a water heater with a small amount of heat stored in a hot water storage tank. In the hot water supply control system according to any one of claims 1 to 3,
A prediction unit (52) for predicting the amount of power supplied within each reference time excluding a plurality of heat pump water heaters (60a, 60b, ...) in the predetermined target area (15),
The operation execution unit (58)
Within each reference time, within the range of power difference between the reference power amount and the supplied power amount within the reference time excluding the heat pump water heater (60a, 60b, ...) predicted by the prediction unit (52), A hot water supply control system, wherein a heating operation of a part of the number of water heaters among the heat pump water heaters (60a, 60b, ...) to be heated is executed. In the hot water supply control system according to any one of claims 1 to 4,
The operation execution unit (58)
A hot water supply control system, wherein a heating operation of a certain number of heat pump water heaters (60a, 60b,...) Is executed so that an electricity bill for each predetermined period does not exceed a predetermined upper limit value.

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