JP2018165596A - Photovoltaic power generation device cooperating hot water storage type hot water supply system, and photovoltaic power generation device cooperating hot water storage type hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce costs by reducing a power purchase amount during a night boiling-up operation.SOLUTION: A surplus boiling-up control part 40 switches control of a heat pump device 19, so that a daytime boiling-up operation is executed when a cumulative value is not less than a threshold value based on whether or not the cumulative value in a high surplus power period on the next day is a predetermined threshold value, and the daytime boiling-up operation is not executed when the cumulative value is less than the threshold value. Thus, even if the high surplus power period includes a period when a surplus power estimation value is less than a device use power estimation value, a cumulative value before and after the included period when the surplus power estimation value is not less than the device use power estimation value becomes not less than the threshold value and thereby it is switched to the daytime boiling-up operation, resulting in prevention of waste due to no daytime boiling-up operation.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a solar power generation apparatus-linked hot water storage system and a solar power generation apparatus-linked hot water supply system that perform boiling operation using electric power generated by solar power generation.

  Conventionally, in this type of solar power generation apparatus linked hot water supply hot water system, as described in Patent Document 1, the surplus power value of the solar power generation apparatus predicted on the next day is consumed by the hot water storage hot water supply apparatus. If it is above the predicted value, it is determined that boiling operation using photovoltaic power generation in the daytime the following day (hereinafter referred to as daytime boiling operation as appropriate) can be performed, and is performed in the nighttime zone from the day before the next day to the next day. In some cases, the amount of boiling in the boiling operation using the purchased power from outside the system (hereinafter referred to as night boiling operation as appropriate) is reduced to reduce the cost.

  According to this conventional technology, if there is a period during which the predicted surplus power is equal to or greater than the predicted power consumption of the device (hereinafter referred to as “high surplus power period” as appropriate), the daytime boiling operation is performed. Thus, it is conceivable to reduce the amount of boiling by the daytime boiling operation from the nighttime boiling operation.

  However, if the daytime boiling operation is performed for a too short time, it may become inefficient. In order to avoid this, as described in Patent Document 2, the daytime boiling operation is performed only when the high surplus power period continues to some extent (for example, a predetermined threshold value or more). It is possible.

JP 2013-148287 A JP 2013-110951 A

  However, even in the above case, if a period in which the surplus power predicted value is less than the device power consumption predicted value is sandwiched in the middle of the relatively long continuous high surplus power period (actually, the power purchase In spite of the possibility of cost reduction due to the reduction, there was a problem in that there was a case where waste during the daytime boiling operation occurred.

  In order to solve the above-mentioned problems, according to claim 1 of the present invention, a solar power generation device, a hot water storage tank for storing hot water, and a heating means for heating the hot water are provided, and the heating means is hot water in the hot water storage tank. And a hot water storage hot water supply apparatus that performs a boiling operation to heat the solar power generation apparatus, and determines a surplus power predicted value in a specific period using a predicted power generation value of the solar power generation apparatus. Surplus power prediction means, apparatus power consumption prediction means for determining a device power consumption prediction value consumed by the hot water storage hot water supply device in the specific period, and the surplus power prediction value in the specific period is the device power consumption Control means for controlling the heating means so as to perform the boiling operation with electric power from the photovoltaic power generation device based on a cumulative value of a period that is equal to or greater than a predicted value. A.

  Further, in claim 2, the control means determines whether or not to perform the boiling operation with electric power from the photovoltaic power generation device based on whether or not the cumulative value is equal to or greater than a predetermined threshold value. The heating means is controlled so as to be switched.

  Further, in claim 3, there are a plurality of time segments in which the surplus power predicted value is equal to or greater than the device power consumption predicted value in the specific period, and the control means is provided for each of the plurality of time segments. Based on the accumulated value of the period, the heating means is controlled to perform the boiling operation with electric power from the solar power generation device.

  According to a fourth aspect of the present invention, the specific period is the next day of a desired day, and the solar power generation apparatus-linked hot water storage system further includes a period between the desired day and the start time of a predetermined night zone extending over the next day. And determining means for determining whether or not to perform the boiling operation with electric power from the photovoltaic power generation device based on the accumulated value on the next day at the predetermined timing, and the control means includes the determining means Based on the determination result, the heating means is controlled on the next day so as to switch whether or not the boiling operation is performed with the electric power from the solar power generation device.

  According to a fifth aspect of the present invention, there is provided a hot water storage tank for storing hot water and a heating means for heating the hot water, and the heating means heats the hot water in the hot water storage tank in cooperation with a solar power generation device. In the solar power generation device linked hot water storage hot water supply device that performs the upper operation, surplus power acquisition means for acquiring a surplus power prediction value in a specific period based on the generated power prediction value of the solar power generation device, and in the specific period, The apparatus power consumption prediction means for determining the apparatus power consumption predicted value consumed by the hot water storage type hot water supply apparatus, based on the cumulative value of the period in which the surplus power predicted value is equal to or greater than the apparatus power consumption predicted value in the specific period, And a control means for controlling the heating means so as to perform the boiling operation with electric power from a solar power generation device.

  According to Claim 1 of this invention, the solar power generation device and the hot water storage type hot water supply device are provided. The solar power generation device can receive sunlight and generate electric power, and the hot water storage hot water supply device uses the electric power generated by the solar power generation device to heat the hot water in the hot water storage tank. You can drive up.

  Thus, when performing a boiling operation using electric power generated by photovoltaic power generation, the electric power value supplied to the hot water storage type hot water supply device (specifically, for example, consumption of the electric load excluding the hot water storage type hot water supply device from the generated electric power value) The surplus power value obtained by subtracting the load power consumption value) needs to be large to some extent. Therefore, in order to perform the boiling operation smoothly, according to claim 1, surplus power prediction means and apparatus power consumption prediction means are provided. That is, the surplus power predicting means uses a predicted power generation value of the solar power generation device that represents a temporal variation of the power generation value in the solar power generation device, and is used for a specific period (for example, the next day of the desired date, and so on). The surplus power prediction value for one day is determined. The apparatus power consumption prediction means determines an apparatus power consumption predicted value consumed by the hot water storage type hot water supply apparatus on the next day. Thereafter, based on the predicted surplus power value and the predicted power consumption value of the device, when the surplus power predicted value is greater than or equal to the predicted power consumption value of the hot water storage water heater consumed by the control means in the daytime zone of the specific period. In addition, the boiling operation by the hot water storage type hot water supply apparatus is executed.

  According to claim 1, the control means, based on a cumulative value of the high surplus power period (= period in which the surplus power prediction value is equal to or greater than the apparatus power consumption prediction value) in the specific period (next day), Control the heating means. Specifically, for example, based on whether or not the cumulative value is a predetermined threshold value, when the cumulative value is equal to or greater than the threshold value, the daytime boiling operation is performed and the cumulative value is set to a threshold value. When the value is less than the value, the control of the heating means is switched so that the daytime boiling operation is not performed.

  This prevents inefficiency as described above by switching to perform the daytime boiling operation when the high surplus power is generated to a certain extent and the accumulated value exceeds a threshold value. Can do. In addition, even if a period in which the predicted surplus power is less than the predicted power consumption of the device is sandwiched in the middle of the high surplus power period as described above, the predicted surplus power before and after the predicted power surplus value is the power consumption of the device. Since the cumulative value of the period that is equal to or greater than the predicted value is equal to or greater than the threshold value, switching to perform the daytime boiling operation is performed, so that it is possible to prevent such waste.

  As a result, since the amount of boiling in the nighttime zone can be reduced according to the amount of boiling in the daytime boiling operation on the next day, the amount of power purchased during the nighttime boiling operation can be reduced and the cost can be reduced. Reduction can be achieved.

  According to the second aspect, the inefficiency and waste can be reliably prevented from occurring by switching execution / non-execution of the daytime boiling operation according to the magnitude of the threshold value.

  In addition, according to the third aspect, the above-described inefficiency and waste can be surely prevented by controlling the daytime boiling operation based on the accumulated value of each of the plurality of time sections that become the high surplus power period. it can.

  Further, according to claim 4, by determining whether or not the daytime boiling operation is executed on the next day on the desired day which is the previous day, the amount of boiling when the daytime boiling operation is executed on the next day is determined. Accordingly, the amount of boiling in the nighttime zone can be reliably reduced, and the amount of power purchased during the nighttime boiling operation can be reduced.

The system block diagram of the solar power generation device cooperation hot water storage type hot-water supply system of one Embodiment of this invention Functional block diagram of HEMS equipment and control unit The graph figure which expresses notionally the temporal behavior of the predicted value of the amount of power generated by solar power generation and the predicted value of the amount of power consumption in the electrical load device when the weather of the next day is predicted to be sunny The graph figure which expresses notionally the time-dependent behavior of the prediction value of the amount of electric power generated by photovoltaic power generation and the prediction value of the electric energy consumption in the electric load device when the next day's weather is predicted to be rainy or cloudy An example of the predicted power usage value of the hot water storage hot water system and the surplus power prediction value when there is temporary cloudiness or rain while clearing from early morning to early evening immediately after sunrise the next day, respectively, conceptually Graph chart The flowchart figure showing the control procedure which a HEMS apparatus performs The flowchart figure showing the first half part of the control procedure which a control apparatus performs The flowchart figure showing the detailed procedure of step S15 The flowchart figure showing the latter half part of the control procedure which a control apparatus performs

  Next, an embodiment of the present invention will be described with reference to FIGS.

  The system configuration of the solar power generation apparatus-linked hot water storage hot water supply system of this embodiment is shown in FIG. In FIG. 1, a part of signal transmission / reception to be described later is not shown in order to prevent the illustration from being complicated. In FIG. 1, a photovoltaic power generation device-linked hot water supply system 100 of the present embodiment is a heat pump hot water storage hot water supply device 1 (solar power) installed in a building (not shown) (corresponding to a specific power consumption facility). Equivalent to a photovoltaic power generation storage hot water storage system), a distribution board 2 connected to a commercial power source 49, a photovoltaic power generation panel 4 installed on the roof of the house, and the power generation of the photovoltaic power generation panel 4. A photovoltaic power generation device 3 having an inverter 5 for converting electric power into an alternating current power source and an electric load device 6 comprising, for example, an air conditioner other than the hot water storage type hot water supply device 1 (in FIG. An air conditioner ”, a HEMS (= Home Energy Management System) device 7 for performing power management in the home of the house, a network communication network 8, And an over server 9.

  The HEMS device 7 is connected to the hot-water storage type hot water supply device 1 and the solar power generation device 3 so as to be capable of bidirectional communication (see broken lines; the same applies hereinafter). Thereby, the HEMS apparatus 7 can collect the usage status of the hot water storage type hot water supply device 1, the power generation information of the solar power generation device 3, and the information of the power consumption for each branch circuit of the distribution board 2. The HEMS device 7 is further connected to the server 9 via the network communication network 8 so that necessary information can be exchanged. In addition, instead of the HEMS device 7 collecting the generated power information through communication with the solar power generation device 3, the HEMS device 7 inputs the generated power to the distribution board 2, or the distribution board 2 and the commercial You may make it collect the electric power generation information of the solar power generation device 3 by monitoring transmission / reception of the electric power between the power supplies 49. FIG.

  The hot water storage type hot water supply device 1 includes a remote control device 50, a hot water storage tank 10 for storing hot water, a water supply pipe 11 for supplying water to the bottom of the hot water storage tank 10, and a hot water discharge pipe 12 for discharging hot water from the top of the hot water storage tank 10. A water supply bypass pipe 13 branched from the water supply pipe 11, a mixing valve that mixes hot water from the hot water discharge pipe 12 and water from the water supply bypass pipe 13 so as to have a hot water supply set temperature set by the remote control device 50. 14, a hot water supply pipe 15 for supplying hot water to a hot water supply terminal (not shown), a hot water supply flow sensor 16 for detecting a hot water supply flow rate and outputting a corresponding detection signal, and a hot water supply temperature sensor 17 for detecting a hot water supply temperature and outputting a corresponding detection signal. And a hot water storage temperature sensor 18 for detecting the hot water storage temperature in the hot water storage tank 10 and outputting a corresponding detection signal. A plurality of hot water storage temperature sensors 18 are provided on the side surface of the hot water storage tank 10 at different height positions. For example, each of the plurality of hot water storage temperature sensors 18 detects a hot water temperature that is set in advance corresponding to the temperature of hot water in a sufficiently heated state and is equal to or higher than a predetermined threshold value. Is output to the control device 31. Thereby, based on how many of the plurality of hot water storage temperature sensors 18 are outputting the detection signal, the control device 31 is sufficiently heated in the hot water storage tank 10. The amount of hot water (ie, the amount of hot water stored) can be detected.

  The hot water storage type hot water supply apparatus 1 further includes a heat pump device 19 (corresponding to a heating means) that heats the hot water in the hot water storage tank 10 to a boiling target temperature. The heat pump device 19 includes a compressor 20 that compresses and conveys refrigerant to high temperature and high pressure, a water refrigerant heat exchanger 21 that performs heat exchange between the high temperature and high pressure refrigerant and water from the hot water storage tank 10, and the water refrigerant heat. An expansion valve 22 that decompresses and expands the refrigerant after heat exchange in the exchanger 21, an air heat exchanger 23 that exchanges heat between the outside air and the low-pressure refrigerant and evaporates the low-pressure refrigerant, and blows outside air to the air heat exchanger 23. And a discharge temperature sensor 25 for detecting the temperature of the refrigerant discharged from the compressor 20 and outputting a corresponding detection signal to the control device 31, and for detecting the outside air temperature and controlling the corresponding detection signal. An outside air temperature sensor 30 that outputs to the device 31 is provided.

  The hot water storage type hot water supply device 1 further connects the control device 31 that controls the operation of the entire hot water storage type hot water supply device 1, the lower part of the hot water storage tank 10, and the water side inlet of the water refrigerant heat exchanger 21. A heating return pipe 27, a heating return pipe 27 connecting the water outlet of the water-refrigerant heat exchanger 21 and the upper part of the hot water storage tank 10, a heating circulation pump 28 provided in the middle of the heating forward pipe 26, It has a boiling temperature sensor 29 that is provided in the heating return pipe 27 and outputs a detection signal to the control device 31. The heating forward pipe 26, the heating return pipe 27, and the heating circulation pump 28 constitute a heating circulation circuit (hereinafter simply referred to as “heating circulation circuits 26, 27, 28” as appropriate).

  As described above, the solar power generation apparatus-linked hot water supply system 100 according to this embodiment includes the solar power generation apparatus 3 and the hot water storage type hot water supply apparatus 1. When the sunshine conditions are good, the solar power generation device 3 can receive power from the solar power generation panel 4 to generate power, and the hot water storage hot water supply device 1 is the solar power generation device 3. Using the generated electric power, the heat pump device 19 can perform a boiling operation in which hot water in the hot water storage tank 10 is heated through the heating circulation circuits 26, 27, and 28. Thus, when performing the boiling operation using the power generated by photovoltaic power generation, at least the generated power value is somewhat large (specifically, the power value supplied to the hot water storage type hot water supply device 1, that is, the generated power value is used to store hot water. The surplus power value obtained by subtracting the load power consumption value consumed by the electrical load device 6 excluding the hot water heater 1 is required to be large to some extent. Therefore, in order to smoothly perform the boiling operation, the photovoltaic power generation apparatus cooperation hot water storage hot water supply system 100 is provided with the functional units shown in FIG. 2 in the HEMS device 7 and the control device 31.

  That is, as shown in FIG. 2, the HEMS device 7 includes a weather information acquisition unit 32A, a generated power prediction unit 32B, a load power consumption prediction unit 32C, a device power consumption prediction unit 32D, and a surplus power prediction unit. 32E. In addition, the control device 31 includes a surplus boiling time zone setting unit 33A, a surplus boiling determination unit 33B, a surplus boiling time segment determining unit 33C, a surplus boiling control unit 40, and a surplus boiling capacity calculation unit. 37, hot water usage learning unit 34, required heat amount determination unit 35, night boiling capacity calculation unit 36, corrected night boiling capacity calculation unit 38, night boiling control unit 39, and daytime boiling increase control unit 42 And are provided. In addition, the allocation (distribution) of these functional units in the HEMS device 7 and the control device 31 is not limited to the illustrated example. For example, by enhancing communication contents between the HEMS device 7 and the control device 31, A part of the functions 32 </ b> A to 32 </ b> E provided in the HEMS device 7 may be configured in the control device 31. Conversely, the functions provided in the control device 31. A part of the functions of the units 33A to 33C, 34 to 40, and 42 may be provided in the HEMS device 7.

  The weather information acquisition unit 32A acquires, for example, weather information (for example, weather forecast information and sunshine time information) emitted from the server 9, for example. In addition, you may acquire the weather information as well-known information from appropriate places other than the server 9. FIG.

  The generated power prediction unit 32B is acquired from the solar power generation device 3, based on the amount of generated power per unit time that has fluctuated in the past predetermined period, and the weather information acquired by the weather information acquisition unit 32A, In a specific period to be determined (in this example, for example, one day following the desired date on which the control procedure according to the flow shown in FIGS. 6 to 9 described later is executed, hereinafter simply referred to as “next day” as appropriate) A generated power predicted value for each unit time in the generated power behavior of the photovoltaic power generation device 3 that varies with time is determined (calculated).

  Based on the power consumption per unit time of the past predetermined period of the electrical load device 6 such as an air conditioner in the building that has been acquired from the distribution board 2, the load power consumption prediction unit 32C Then, a predicted value (including a case where the time variation does not occur) of the load power consumption indicating the power consumption per unit time of the electric load device 6 is determined (calculated).

  The device power consumption prediction unit 32D (corresponding to the device power consumption prediction means) is acquired from the hot water storage hot water supply device 1 and based on the power consumption per unit time of the hot water storage hot water supply device 1 in the past predetermined period. Determine (calculate) a predicted value of power consumption of the device that represents power consumption per unit time of the hot water storage hot water supply device 1 on the next day (including whether or not it fluctuates over time, which corresponds to the predicted power consumption value of the device). .

  The surplus power predicting unit 32E (corresponding to surplus power predicting means) is the generated power predicted value determined by the generated power predicting unit 32B and the load used power predicted value determined by the load used power predicting unit 32C. Based on the above (specifically, subtracting the predicted load use power value from the predicted power generation value), the surplus power prediction value per unit time in the building in the surplus power behavior that fluctuates over time on the next day is determined. (calculate.

  The surplus boiling time zone setting unit 33A includes a surplus power prediction value for each unit time of the next day determined by the surplus power prediction unit 32E, and a unit time of the next day determined by the device power consumption prediction unit 32D. One or more (in other words, at least one) time period (boiling possible time period) in which the predicted surplus power value is greater than or equal to the predicted apparatus power consumption value based on each apparatus power consumption prediction value To do. In addition, this boiling possible time slot | zone is corresponded to the period when a surplus electric power predicted value becomes more than an apparatus power consumption predicted value.

  A specific example of the determination of the at least one boiling possible time zone will be described with reference to FIG. FIG. 3 shows a time axis in which time is engraved such as “0:00”, “10:00”,..., “23:00”, “24:00” on the horizontal axis, and electric energy [ kWh], the predicted value of the generated power amount in the solar power generation device 3 on the next day (predicted by the generated power prediction unit 32B), the predicted load usage power value in the electrical load device 6 (load usage power prediction unit) 3C is a graph conceptually illustrating an example of the predicted power usage of the hot water storage hot water supply apparatus 1 and a predicted power usage value of the hot water storage device 1 (predicted by a power usage prediction unit 32D).

  As shown in FIG. 3, this example is an example when the weather on the next day is predicted to be sunny based on the weather information acquired by the weather information acquisition unit 32A. That is, as shown by the solid line graph in the figure, the predicted value of the amount of generated power in the solar power generation device 3 changes at approximately 0 [kWh] from 0:00 to 6:00, but at sunrise (6: It gradually rises between 7:00 and 7:00), 0.2 [kWh] at 7:00, 1.0 [kWh] at 8:00, 1.5 [kWh] at 8:30, It reaches 1.8 [kWh] at 9:00, 2.5 [kWh] at 10:00, 3.2 [kWh] at 11:00, and reaches a peak at 3.3 [kWh] at 12:00 . After that, the amount of power generated by the solar power generation device 3 gradually decreases with the shade of the sun, becoming 3.2 [kWh] at 13:00, 2.5 [kWh] at 14:00, and thereafter 15:00. 1.8 [kWh] at 15:30, 1.5 [kWh] at 15:30, 1.0 [kWh] at 16:00, 0.2 [kWh] at 17:00, then sunset (17: 00-00) 18:00), the value after 18:00 becomes almost 0 [kWh] until 24:00.

  On the other hand, as shown by the gray bar graph in the figure, the predicted value of the load power consumption in the electrical load device 6 is 0.5 [kWh] throughout the day from 00:00 to 24:00 on the next day. ing. As a result, as shown in FIG. 3, the predicted value of the surplus power represented by “amount of generated power in the solar power generation device 3” − “amount of load power used in the electrical load device 6” is 8: 00 for the first time 0.5 [kWh], 1.0 [kWh] at 8:30, 1.3 [kWh] at 9:00, 2.0 [kWh] at 10:00, 11:00 After 2.7 [kWh], the maximum is 2.8 [kWh] at 12:00. After that, it gradually decreases, 2.7 [kWh] at 13:00, 2.0 [kWh] at 14:00, 1.3 [kWh] at 15:00, 1.0 [kWh] at 15:30 , 16:00 becomes 0.5 [kWh].

  In this example, the predicted value of the apparatus power consumption when the hot water storage type hot water supply apparatus 1 is operated is 1 [kWh] per unit time with respect to the time fluctuation of the surplus power as described above. As a result, the surplus boiling up time zone setting unit 33A satisfies “surplus power” ≧ “apparatus power usage of the hot water storage hot water supply device 1”, a time zone in which the hot water storage hot water supply device 1 can be operated with the surplus power ( As a boiling possible time zone), a time zone from 8:30 to 15:30 is set. In FIG. 3, as an example, the case where the boiling operation of the hot water storage type hot water supply apparatus 1 is actually scheduled to be executed at 11:00 to 14:00 of the boiling possible time zone is shown in parallel. This is illustrated and illustrated (see black bar graph).

  As described above, in the present embodiment, the generated power prediction unit 32B determines the generated power value in the solar power generation device 3 in response to the weather information of the next day acquired by the weather information acquisition unit 32A, Based on this, it is possible to predict the boiling-up possible time zone where the surplus boiling-up time zone setting unit 33A becomes a generated power value at which the boiling operation can be performed.

  In addition, the example shown in FIG. 3 is an example when the weather on the next day is predicted to be sunny as described above. On the other hand, for example, FIG. 4 shows a case where the weather on the next day is predicted to be rain or cloudy (almost no solar radiation by the sun) by the weather information acquired by the weather information acquisition unit 32A. In this case, as shown by the solid line graph in the figure, the predicted value of the power generation amount in the solar power generation device 3 changes at 0 [kWh] from 0:00 to 8:00, and with the sunrise Slightly increased, but at 9:00 0.1 [kWh] at 10:00, 0.3 [kWh] at 10:00, 0.5 [kWh] at 11:00, 0.6 [kWh] at 12:00 The peak at 13:00 after passing through remains at about 0.7 [kWh]. Thereafter, the power generation amount in the solar power generation device 3 is 0.6 [kWh] at 14:00, 0.5 [kWh] at 15:00, 0.3 [kWh] at 16:00, and 17:00. It becomes 0.1 [kWh], and after 18:00, it becomes almost 0 [kWh] until 24:00. As a result, as shown in FIG. 4, the predicted value of the surplus power represented by “the amount of generated power in the solar power generation device 3” − “the amount of power used in the electric load device 6” is 12: It occurs only slightly between 00 and 14:00, and its maximum value also remains at about 0.2 [kWh]. In such a case, the surplus boiling up time zone setting unit 33A cannot set the up boiling possible time zone where “surplus power” ≧ “apparatus usage power of the hot water storage hot water supply device 1”. As a result, as shown in FIG. 4, the boiling operation of the hot-water storage type hot water supply device 1 is inexpensive (as usual) by supplying power from the commercial power source 49 (without using power generated by solar power generation). It is scheduled to be executed at nighttime (23:00 to 7:00 in this example) (details will be described later).

  By the way, when performing the boiling operation in the daytime day of the next day, the amount of the boiling amount by the boiling operation in the daytime period (hereinafter referred to as daytime boiling operation as appropriate), the night from the desired day to the next day. It is possible to reduce the amount of boiling by the boiling operation (hereinafter referred to as night boiling operation as appropriate) executed by a normal method (using power purchased from outside the system) and reducing the cost.

  Therefore, if there is a period during which the surplus power predicted value is equal to or greater than the apparatus power consumption predicted value (hereinafter, referred to as “high surplus power period”, the period of the boiling-up possible time zone), the day-time boiling operation is performed. It is conceivable to reduce the amount of boiling by the daytime boiling operation from the nighttime boiling operation. However, if the daytime boiling operation is performed in a too short time, it may become inefficient.

  In order to avoid this, it is conceivable to perform the daytime boiling operation only when the high surplus power period continues to some extent (for example, a predetermined threshold value or more). However, in this case as well, if a period during which the predicted surplus power is less than the predicted power consumption for the device is sandwiched in the middle of the high surplus power period that continues for a relatively long time, (In spite of the possibility of cost reduction), there may be a waste of not performing a daytime boiling operation.

  Therefore, according to the present embodiment, as shown in FIG. 2, the surplus boiling up determination unit 33B and the surplus boiling up time division determination unit 33C are provided. The surplus boiling determination unit 33B (corresponding to a determination unit) is configured to perform the above-mentioned next day at a predetermined timing (for example, the start time of the night zone) from the desired date to the start time of the predetermined night zone over the next day. Based on the accumulated value of the period (the period of time during which boiling is possible, the high surplus power period) in which the surplus power predicted value is equal to or greater than the apparatus power consumption predicted value, the boiling operation is performed by the power from the solar power generation device 3. Determine whether to do it. At this time, when a plurality of high surplus power periods (corresponding to a plurality of time segments) are determined, the surplus boiling determination unit 33B is based on the accumulated value of each of the plurality of high surplus power periods. judge. Specifically, the surplus boiling determination unit 33B determines whether the cumulative value is equal to or greater than the threshold based on whether the cumulative value is equal to or greater than a predetermined threshold (for example, 3 hours). If it is determined that the daytime boiling operation is performed, it is determined that the daytime boiling operation is not performed when the accumulated value is less than a threshold value.

  Then, when the surplus boiling time determination unit 33C determines that the daytime boiling operation is performed by the surplus boiling determination unit 33B, the surplus boiling time determination unit 33B determines at least the surplus boiling time period setting unit 33A. Among the time zones including one boiling possible time zone, a time segment in which a time length during which the boiling operation can be performed in that time zone is a predetermined value (for example, 3 hours) or more is determined in advance. On the next day, the hot water storage type hot water supply device 1 is determined as the boiling time division in which the boiling operation should be performed by the electric power from the solar power generation device 3. A specific example of the determination of the time segment will be described with reference to FIG.

  In FIG. 5, as in FIG. 3 and the like, “23:00” on the horizontal axis (“the desired day”), “0 o'clock”, “1 o'clock” on the next day, “21 o'clock”, “22” Taking the time axis in which time is engraved, such as “hour”, taking the electric energy [Wh] on the vertical axis, the predicted surplus power in the hot water storage hot water supply device 1 (predicted by the surplus power predicting unit 32E), and The example of the time fluctuation | variation of the said apparatus usage power prediction value (predicted by the apparatus usage power prediction part 32D) is shown. In the surplus power prediction value represented by “predicted power generation value in photovoltaic power generation device 3” − “predicted load power consumption value in electrical load device 6”, the positive power amount in the figure is the predicted power generation value. Is larger than the predicted load power consumption value, and the minus power amount in the figure represents the case where the predicted generated power value is smaller than the predicted load power consumption value.

  In the example shown in FIG. 5, the weather information acquired by the weather information acquisition unit 32 </ b> A was predicted to clear from early morning to evening just after sunrise on the next day, while temporarily clouding or raining occurred in the meantime. This is an example (another example different from the examples shown in FIGS. 3 and 4). In this case, as shown by the bar graph in the figure, the surplus power predicted value becomes -1000 [Wh] at 23:00 on the desired day, and then -2000 [Wh] at 0:00 on the next day, -500 [Wh] at 1:00, -500 [Wh] at 2:00, -1000 [Wh] at 3:00, -1000 [Wh] at 4:00, both of which are negative values .

  After that, as described above, the surplus power predicted value rapidly increases due to the clear sky immediately after sunrise, and 1000 [Wh] at 5:00, 1500 [Wh] at 6:00, and 7:00 (the power used by the apparatus in this case) It exceeds the expected value of 1600 [Wh]) and reaches 2500 [Wh] at 8:00 and 3000 [Wh].

  However, the surplus power prediction value decreases rapidly due to temporary cloudiness or rain, and reaches 1500 [Wh] at 9:00 (below the device power consumption prediction value 1600 [Wh] in this case). Thereafter, the surplus power predicted value rapidly increases due to the recovery of the weather and the like, and reaches 12,500 [Wh] at 10:00 (exceeding the predicted power usage value of 1600 [Wh] in this case).

  Then, the surplus power predicted value decreases rapidly again due to temporary cloudiness or rain, and becomes 1500 [Wh] at 11:00 (below the device power consumption predicted value 1600 [Wh] in this case). Thereafter, the surplus power predicted value rapidly increases due to weather recovery or the like, and reaches 2000 [Wh] at 12:00 (exceeding the predicted power usage value of 1600 [Wh] in this case).

  Then, the surplus power predicted value gradually decreases with the passage of time, 1800 [Wh] at 13:00, and 1400 [Wh] in this case (below the predicted power usage value of 1600 [Wh] in this case) ], 15:00 becomes 800 [Wh].

  Thereafter, the surplus power predicted value further decreases mainly due to an increase in the load power consumption predicted value associated with the use of the electrical load device 6, and is -1000 [Wh] at 16:00 and -2000 [17:00 at 17:00. It decreases to -3000 [Wh] at 18:00 and 19:00. Thereafter, the surplus power prediction value slightly increases mainly due to a decrease in use of the electric load device 6 and becomes −2000 [Wh] at 20:00 and 21:00, and −1000 [Wh] at 22:00.

  When the behavior shown in FIG. 5 is obtained, the boiling operation using the generated power in the solar power generation device 3 can be executed, and the above-described “surplus power predicted value” ≧ “device usage power predicted value”. The upper possible time zones are three time zones from about 6:30 to about 8:30, from about 9:30 to about 10:30, and from about 11:30 to about 13:30 (indicated by a thick broken line in FIG. 5) reference). As described above, when a period in which the predicted surplus power is less than the predicted power usage value is sandwiched in the middle of the high surplus power period (in other words, the high surplus power period is not continuous), as described above. When the daytime boiling operation is performed only when the high surplus power period continues to some extent (for example, 3 hours or more), the cost can be reduced by actually reducing the power purchase. In spite of this, there is a possibility that waste will not occur during daytime boiling.

  Therefore, in this embodiment, the surplus boiling determination unit 33B calculates a cumulative value (5 hours in the example shown in FIG. 5) for each of the three time zones, and the cumulative value is determined in advance. When it is more than a predetermined threshold (for example, 3 hours), it is determined that the daytime boiling operation is performed. And the time which can perform the said boiling operation continuously from the time slot | zone which includes the said three time zones, ie, the time zone from 6:30 to 13:30, by the said excess boiling time division | segmentation determination part 33C. A time segment in which the length is a predetermined value (3 hours in this example) is determined as the boiling time segment in which the boiling operation is to be performed.

  In the time zone from 6:30 to 13:30, the time divisions in which the time length is 3 hours are 6:30 to 9:30, 7:30 to 10:30, 8:30 to 11:30, Although five time segments of 9:30 to 12:30 and 10:30 to 13:30 are conceivable, in the example illustrated in FIG. 5, for example, the total surplus power prediction value in the time segment is relatively large 6: 30-9: 30 is determined in the boiling time section. The conditions for determining the boiling time section are not limited to this. For example, a time section in which the energy consumption efficiency (COP) of the heat pump device 19 is relatively high may be used as the boiling time section.

  As described above, even if a period during which the surplus power prediction value is less than the device power consumption prediction value is sandwiched in the middle of the high surplus power period, the surplus power prediction value before and after that is the device power consumption prediction. Since the cumulative value of the period that is equal to or greater than the value is equal to or greater than the threshold value, switching to perform the daytime boiling operation is performed, so that it is possible to prevent such waste. As a result, since the amount of boiling in the nighttime zone can be reduced according to the amount of boiling in the daytime boiling operation on the next day, the amount of power purchased during the nighttime boiling operation can be reduced and the cost can be reduced. Reduction can be achieved. It should be noted that during the period when the surplus power predicted value is less than the device power consumption predicted value, the amount of power purchase occurs, but even during this period, the surplus power value is not zero and the power purchase amount is relatively small (buy Therefore, it is possible to secure a cost reduction effect.

  Thereafter, the boiling time section determined by the surplus boiling time section determination unit 33C as described above is output to the surplus boiling capacity calculation unit 37. The surplus boiling capacity calculation unit 37 is configured to cause the hot water storage type hot water supply apparatus 1 to boil up to a predetermined boiling target temperature during the boiling time period determined by the surplus boiling time period determination unit 33C. The surplus boiling capacity that can be obtained is calculated. The calculated surplus boiling capacity is output to the corrected night boiling capacity calculation unit 38. In addition, when it determines with the said surplus boiling up determination part 33B not performing the daytime boiling operation, the calculation of the surplus boiling up capacity by the said surplus boiling up capacity calculation part 37 is not performed.

  On the other hand, at this time, the hot water usage learning unit 34 has a detection signal from the hot water supply flow sensor 16 (representing the amount of hot water supply), a detection signal from the hot water temperature sensor 17 (representing the hot water supply temperature), and a water supply temperature. A detection signal (representing the feed water temperature) of a sensor (not shown) is input. The used hot water amount learning unit 34 converts the inputted hot water amount into a hot water amount at a predetermined temperature (for example, 43 [° C.]) while corresponding to the hot water temperature, and learns it as a learned hot water amount per day for a past predetermined period.

  The required heat amount determination unit 35 determines the required heat amount on the next day based on the learned hot water amount for each day in the past predetermined period learned by the used hot water amount learning unit 34.

  The night boiling capacity calculation unit 36 calculates the necessary capacity by dividing the necessary heat quantity on the next day determined by the necessary heat quantity determination unit 35 by the temperature difference between the boiling target temperature and the feed water temperature. Let it be the night boiling capacity before correction using the surplus boiling capacity described later. The night boiling capacity calculated in this way is output to the corrected night boiling capacity calculator 38.

  The corrected night boiling capacity calculation unit 38 calculates the night boiling capacity calculated by the night boiling capacity calculation unit 36 as described above (in other words, the boiling temperature corresponding to the amount of hot water required for one day on the next day). The surplus boiling capacity calculated by the surplus boiling capacity calculation unit 37 as described above (in other words, the boiling capacity corresponding to the amount of hot water heated up in the boiling time section in the next day) ) Is subtracted to calculate the corrected night boiling capacity (corresponding to the amount that cannot be raised by surplus power during the day of the next day). The corrected night boiling capacity is output to the night boiling controller 39. If the surplus boiling determination unit 33B determines not to perform the daytime boiling operation, the corrected night boiling capacity calculation unit 38 does not calculate the corrected night boiling capacity, and the night boiling is not performed. The night boiling capacity calculated by the upper capacity calculation unit 36 is output to the night boiling control unit 39.

  In the nighttime zone from the desired day to the next day (for example, from 23:00 on the desired day to 7:00 on the next day), the nightly boiling control unit 39 performs the corrected nightly boiling capacity calculation unit 38. The hot water storage type hot water supply apparatus 1 is configured to boil the calculated corrected night boiling capacity (the night boiling capacity calculated by the night boiling capacity calculator 36 when the day boiling operation is not performed). The heat pump device 19 (specifically, the compressor 20, the blower 24, the heating circulation pump 28, etc.) is controlled.

  The surplus boiling up control unit 40 (corresponding to the control means) is based on whether or not the accumulated value is equal to or greater than a predetermined threshold (determination result by the surplus boiling up judging unit 33B). The heat pump device 19 is controlled so as to switch between performing and not performing the boiling operation with electric power from 3. That is, the surplus boiling control unit 40 performs the boiling operation with the electric power from the solar power generation device 3 when the surplus boiling determination unit 33B determines that the daytime boiling operation is performed. The heat pump device 19 is controlled as described above, and when the surplus boiling determination unit 33B determines that the daytime boiling operation is not performed, the boiling operation with the electric power from the solar power generation device 3 is performed. Absent.

  Specifically, when it is determined by the surplus boiling rise determination unit 33B that the daytime boiling operation is performed, the boiling time segment determined by the surplus boiling time segment determination unit 33C is the surplus boiling segment. It is output to the control unit 40. The surplus boiling control unit 40 uses the surplus power to calculate the surplus boiling capacity in the boiling time section of the next day (for example, 6:30 to 9:30 on the next day in the example of FIG. 5). The heat pump device 19 (specifically, the compressor 20, the blower 24, the heating circulation pump 28, etc.) of the hot water storage type hot water supply device 1 is controlled so as to boil the surplus boiling capacity calculated by 37. To do.

  Further, the daytime boiling point increase control unit 42 reduces the amount of hot water stored in the hot water storage tank 10 to a predetermined threshold value or less in a daytime zone other than the nighttime zone (for example, 7:00 to 23:00). (Detected by the plurality of hot water storage type hot water supply temperature sensors 18), the heat pump device 19 of the hot water storage type hot water supply device 1 (in detail) so as to boil a predetermined daytime boiling increase capacity using the commercial power source 49. Controls the compressor 20, the blower 24, the heating circulation pump 28, etc.). In the night boiling capacity calculation unit 36, the required capacity calculated as described above is compared with the capacity of the hot water storage tank 10, and the smaller one of them may be used as the night boiling capacity (hereinafter the same). ). At this time, when the required capacity exceeds the capacity of the hot water storage tank 10, the night boiling capacity calculated by the night boiling capacity calculator 36 is input to the daytime boiling increase controller 42 (FIG. 2), the daytime boiling increase control unit 42 calculates the daytime boiling increase capacity as the daytime boiling increase capacity, and the calculated daytime boiling increase capacity is heated to Such control may be performed.

  Next, control procedures executed by the HEMS device 7 and the control device 31 in order to realize the above method will be described with reference to the flowcharts of FIGS. 6, 7, 8, and 9.

  FIG. 6 shows a control procedure executed by the HEMS device 7. In FIG. 6, first, in step S110, the HEMS device 7 determines whether or not the start time (for example, 23:00) of the nighttime period (for example, 23:00 to 7:00) where the power unit price is inexpensive has been reached. The determination is not satisfied until the night zone start time is reached (S110: NO), and the loop waits. When the night zone start time is reached, the determination is satisfied (S110: YES), and the process proceeds to step S120.

  In step S120, the HEMS device 7 acquires the weather information from the server 9 by the weather information acquisition unit 32A. The weather information acquisition unit 32A periodically acquires the weather information from the server 9 and stores the latest data in an appropriate location. When this flow is started, at the timing of the step S120, You may make it read and use the data of the weather information memorize | stored in the said appropriate location.

  Thereafter, the process proceeds to step S130, where the HEMS device 7 uses the generated power prediction unit 32B based on the amount of generated power per unit time in the past predetermined period of the solar power generation device 3 and the weather information acquired in step S120. Then, a predicted power generation value for each unit time of the solar power generation device 3 in a specific period (in this example, the next day, the same applies hereinafter) is determined (calculated).

  In step S140, the HEMS device 7 uses the load power consumption prediction unit 32C to calculate the electric load device on the next day based on the load power consumption per unit time in the past predetermined period of the electric load device 6. 6 is used to determine (calculate) a predicted load power consumption value per unit time.

  Thereafter, in step S150, the HEMS device 7 uses the apparatus power consumption prediction unit 32D to determine the hot water storage hot water supply for the next day based on the apparatus power consumption per unit time of the hot water storage hot water supply apparatus 1 in the past predetermined period. A predicted apparatus power consumption value for each unit time of the apparatus 1 is determined (calculated). As already described, the controller 31 of the hot water storage hot water supply device 1 may have the same function as the device power consumption prediction unit 32D, and the device power consumption predicted value may be determined. At this time, the control device 31 itself may learn its own power consumption by a known method, or may determine its own power consumption as a constant value. In this case, only the surplus power prediction value is output to the control device 31 in step S170 described later, and only the surplus power prediction value is acquired by the control device 31 in step S10 of FIG. 7 described later.

  Then, the process proceeds to step S160, where the HEMS device 7 uses the surplus power prediction unit 32E to determine the generated power predicted value determined in step S130 and the load usage per unit time of the electrical load device 6 in step S140. Based on the predicted power value, a surplus predicted power value for each unit time in the building on the next day is determined (calculated).

  Thereafter, in step S170, the HEMS device 7 outputs the device power consumption predicted value determined in step S150 and the surplus power predicted value determined in step S160 to the control device 31 and ends this flow.

  7 to 9 show control procedures executed by the control device 31. FIG. First, in FIG. 7, the control device 31 initializes a flag Fn indicating whether or not to perform a boiling operation based on the electric power in the solar power generation device 3 to 0.

  In step S5, the control device 31 determines whether or not the night time start time has come, as in step S110 of FIG. Until the night zone start time is reached, the determination is not satisfied (S5: NO), and the loop waits. When the night zone start time is reached, the determination is satisfied (S5: YES), and the process proceeds to step S10.

  In step S10, the control device 31 acquires the device power consumption prediction value and the surplus power prediction value output in step S170 of FIG. 6 (this step S10 corresponds to surplus power acquisition means). Thereafter, the process proceeds to step S15.

  In step S15, the control device 31 uses the surplus boiling time zone setting unit 33A to calculate the surplus power predicted value for each unit time of the next day acquired in step S10 and the device usage for the unit time of the next day. Based on the predicted power value, at least one boiling-up possible time zone in which the predicted surplus power value is equal to or greater than the predicted power usage value of the apparatus is determined.

  The detailed procedure of step S15 is shown in FIG. In FIG. 8, first, in step S151, the surplus boiling time zone setting unit 33A initializes a flag F indicating that the surplus power prediction value is equal to or greater than the device power consumption prediction value to 0.

  In step S152, the surplus boiling time zone setting unit 33A first sets 7:00, which is the start time of the daytime zone, at the time t to be processed. Thereafter, the process proceeds to step S153.

  In step S153, the surplus boiling up time zone setting unit 33A determines the surplus power predicted value at time t based on the surplus power acquired in step S10 and the device power consumption value at the time t. It is determined whether or not the power consumption of the apparatus is equal to or greater than the predicted value. For example, when the time t is still early, the solar radiation is not sufficient, the amount of surplus power is insufficient and the value is less than the device power consumption, the determination in step S153 is not satisfied (S153: NO), and the process proceeds to step S157. .

  In step S157, the surplus boiling time zone setting unit 33A determines whether or not the flag F is 1. Since F = 0 remains until F = 1 in step S154 described later, this determination is not satisfied (S157: NO), and the process proceeds to step S155.

  In step S155, the surplus boiling time zone setting unit 33A adds a predetermined time deviation Δt (unit time of surplus power predicted value) to the time t, and proceeds to step S156.

  In step S156, the surplus boiling time zone setting unit 33A determines whether or not the time t to be processed at this time is 23:00, which is the end time of the daytime zone. While 23:00 is not reached, the determination is not satisfied (S156: NO), the process returns to step S153, and the same procedure is repeated.

  As described above, during the repetition while shifting the time t, such as step S153 → step S157 → step S155 → step S156 → step S153 →... When it becomes above, determination of step S153 is satisfy | filled (S153: YES), and it moves to step S154.

  In step S154, the surplus boiling time zone setting unit 33A sets the flag F to 1. Thereafter, Δt is added to the time t as described above in step S155, and the process proceeds to step S156. As described above, the determination in step S156 is not satisfied while 23:00 is not reached (S156: NO), the process returns to step S153, and the same procedure is repeated. While the amount of surplus power is greater than or equal to the power used by the apparatus, the same flow is repeated while shifting the time t as in step S153 → step S154 → step S155 → step S156 → step S153 →.

  Thereafter, when the solar radiation becomes insufficient again and the amount of surplus power becomes less than the power used by the apparatus, the determination in step S153 is not satisfied (S153: NO), and the process proceeds to step S157. At this time, since the value of the flag F is 1 in step S154, the determination in step S157 is satisfied (S157: YES), and the process proceeds to step S158.

  In step S158, the surplus boiling time zone setting unit 33A determines the period from when the flag F first changes from 0 to 1 (when the determination in step S153 is satisfied) to this point in time. It is the upper possible time zone. Then, the process proceeds to step S159.

  In step S159, the surplus boiling time zone setting unit 33A returns the flag F to 0 again, then proceeds to step S155, adds Δt to the time t as described above, and proceeds to step S156. As described above, the determination in step S156 is not satisfied while 23:00 is not reached (S156: NO), the process returns to step S153, and the same procedure is repeated.

  As described above, step S153 → step S157 → step S158 → step S159 → step S155 → step S156 → step S153 →... Or step S153 → step S154 → step S155 → step while shifting the time t. While the process of S156 → step S153 →... Is being repeated, the determination is satisfied when the time t reaches 23:00 (S156: YES), this routine ends, and the process proceeds to step S20 of FIG. Transition.

  Returning to FIG. 7, in step S <b> 20, the control device 31 determines that the accumulated value of the high surplus power period on the next day is greater than or equal to a predetermined threshold (for example, 3 hours) by the surplus boiling determination unit 33 </ b> B. It is determined whether or not. If the cumulative value is less than the threshold value, the determination is not satisfied (S20: NO), and the process directly proceeds to step S25. On the other hand, if the cumulative value is equal to or greater than the threshold value, the determination is satisfied (S20: YES), and the routine goes to Step S22.

  In step S22, the control device 31 sets the flag Fn to 1 indicating that the boiling operation based on the electric power in the solar power generation device 3 is executed.

  In step S24, the control device 31 performs the boiling operation from the time zones including the at least one boiling possible time zone determined in step S15 by the surplus boiling time division determining unit 33C. A time segment in which the length of time that can be performed is equal to or greater than a predetermined value (for example, 3 hours; the same applies hereinafter) is determined as the boiling time segment in which the boiling operation should be performed by the power from the solar power generation device 3 on the next day. . As described above, the boiling time segment may be determined based on the total surplus power predicted value in the time segment, the energy consumption efficiency (COP), or the like, or may be determined based on other conditions. May be.

  In step S25, the control device 31 uses the average or standard deviation based on the amount of hot water learned per day during the past predetermined period learned by the hot water amount learning unit 34 by the required heat amount determination unit 35. Is used to determine (calculate) the necessary heat amount on the next day. In addition, you may calculate this required heat amount as a required hot water amount of predetermined temperature (for example, 43 [degreeC]) conversion.

  Thereafter, in step S30, the control device 31 may use the necessary heat amount determined in step S25 by the necessary heat amount determination unit 35 and other conditions such as the outside air temperature acquired in the step (not shown) (or the water supply temperature). ) To determine the boiling target temperature. The boiling target temperature is set as low as possible between, for example, 65 [° C.] to 75 [° C.]. Particularly, when the required amount of hot water is large, the outside air temperature is low, or the water supply temperature is If it is low (compared to other cases), it is set higher.

  In step S35, the control device 31 divides the necessary heat amount determined in step S30 by the temperature difference between the boiling target temperature and the feed water temperature by the night boiling capacity calculation unit 36. Converted to capacity, the above-mentioned night boiling capacity. In addition, when the calculated required capacity calculated in this way exceeds the capacity of the hot water storage tank 10, the capacity of the hot water storage tank 10 may be set as the night boiling capacity.

  In step S40, the control device 31 determines whether or not the flag Fn is 1 indicating that the boiling operation based on the electric power in the solar power generation device 3 is executed. When the flag Fn is 0 indicating that the boiling operation based on the electric power in the solar power generation device 3 is not executed (S40: NO), the process directly proceeds to step S55. On the other hand, when the flag Fn is 1 (S40: YES), the process proceeds to step S45.

  Thereafter, in step S45, the control device 31 causes the surplus boiling capacity calculation unit 37 to change the hot water storage type hot water supply device 1 to the predetermined value of the heat pump device 19 during the boiling time section determined in step S24. The surplus boiling capacity that can be boiled up to the boiling target temperature with the size of the heating capacity is calculated.

  In step S50, the control device 31 subtracts the surplus boiling capacity calculated in step S45 from the night boiling capacity calculated in step S35 by the corrected night boiling capacity calculation unit 38. Then, the corrected night boiling capacity that is actually heated in the night zone is calculated.

  Thereafter, in step S55, the control device 31 uses the night boiling control unit 39 based on the detection results of the plurality of hot water temperature sensors 18 to store the volume of hot water that can be regarded as hot water in a sufficiently heated state (residual hot water). Capacity). Further, in subsequent step S60, the controller 31 uses the night boiling control unit 39 to multiply the value obtained by subtracting the remaining hot water capacity from the corrected night boiling capacity by the difference between the boiling temperature and the feed water temperature. The heating time is divided to calculate the boiling time, and the corrected night boiling capacity calculated in step S50 is suitable for completion of boiling by the end time of the night zone (for example, 7:00). Calculate the boiling start time at night.

  If the flag Fn is 0, the steps S45 and S50 are not executed, and the night boiling boiling control unit 39 calculates the night boiling calculated in the step S35 in the step S60. A night boiling start time appropriate to complete boiling of the upper capacity by the end time of the night zone (for example, 7:00) is calculated.

  Then, the process proceeds to step S62 in FIG. 9, and the control device 31 determines whether or not the time (current time) at this time is the night boiling start time calculated in step S60 by the night boiling control unit 39. judge. The determination is not satisfied until the night boiling start time is reached (S62: NO), and the loop waits. When the night boiling start time is reached, the determination is satisfied (S62: YES), and the process proceeds to step S64.

  In step S64, the control device 31 causes the night boiling control unit 39 to perform the heat pump device 19 of the hot water storage type hot water supply device 1 (specifically, the compressor 20, the blower 24, the heating circulation pump 28, etc.). The night boiling operation is started in which the water taken out from the lower part of the hot water storage tank 10 is heated to the boiling target temperature determined in the step S30 and sequentially stacked from the upper part of the hot water storage tank 10.

  Thereafter, in step S66, after the night boiling operation is performed as described above by the night boiling control unit 39, the control device 31 performs the corrected night boiling capacity (or the above-described calculation) calculated in step S50. It is determined whether or not the hot water storage temperature sensor 18 has detected that the night boiling capacity calculated in step S35 has been boiled (or the current time during operation is the end time of the night time zone). . When the corrected night boiling capacity or the night boiling capacity is raised (or when the end time of the night zone is reached), the determination is satisfied (S66: YES), and it is considered that the night boiling operation is completed. Then, the process proceeds to step S68.

  In step S68, the control device 31 controls the heat pump device 19 by the night boiling control unit 39, and stops the night boiling operation started in step S64. At this time, unheated water remains in the lower part of the hot water storage tank 10 by the same capacity as the excess boiling upper capacity calculated in step S45. Thereafter, the process proceeds to step S69.

  In step S69, the control device 31 determines whether or not the flag Fn is 1 indicating that the boiling operation based on the electric power in the solar power generation device 3 is executed, as in step S40. When the flag Fn is 0 indicating that the boiling operation based on the electric power in the solar power generation device 3 is not executed (S69: NO), the process directly proceeds to step S96. On the other hand, when the flag Fn is 1 (S69: YES), the process proceeds to step S70.

  In step S70, the control device 31 determines whether the time (current time) at this time has reached the start time (excess boiling start time) of the boiling time section determined in step S24 by the surplus boiling control unit 40. Determine whether or not. The determination is not satisfied until the surplus boiling up start time is reached (S70: NO), and the loop waits. When the surplus boiling up start time is reached, the determination is satisfied (S70: YES), and the process proceeds to step S72.

  In step S72, the control device 31 causes the surplus boiling upper control unit 40 to perform the heat pump device 19 of the hot water storage type hot water supply device 1 (specifically, the compressor 20, the blower 24, the heating circulation pump 28, etc.). The excess boiling operation is started in which the water taken out from the lower part of the hot water storage tank 10 is heated to the boiling target temperature determined in the step S30 and sequentially stacked from the upper part of the hot water storage tank 10.

  Thereafter, in step S74, the controller 31 boiled the excess boiling capacity calculated in step S45 after the excess boiling control operation was performed as described above by the excess boiling control unit 40. Is detected by the hot water storage temperature sensor 18 (or the current time during operation is the end time of the boiling time section). When the surplus boiling capacity is boiled (or when the end time of the boiling time section is reached), the determination is satisfied (S74: YES), and it is considered that the surplus boiling operation is completed, and the process proceeds to step S76. Move.

  In step S76, the control device 31 controls the heat pump device 19 by the surplus boiling up control unit 40, and stops the surplus boiling up operation started in step S72. At this time, as described above, since unheated water remains in the lower part of the hot water storage tank 10 at the same capacity as the excess boiling capacity when the night boiling operation is completed, the time until the start of the excess boiling operation is reached. Even if no hot water is supplied at all, it is possible to continuously perform the surplus boiling operation using the entire amount of surplus power that was initially predicted. After the surplus boiling operation is completed in this way, the process proceeds to step S96.

  In step S96, the controller 31 causes the daytime boiling point increase control unit 42 to set the time (current time) at this time to the end time (eg, 23:00) of the daytime zone (eg, 7:00 to 23:00). It is determined whether or not. If it is the daytime end time, the determination is satisfied (S96: YES), the process returns to step S3 shown in FIG. 7, and the same procedure is repeated. If it is not the daytime end time, the determination is not satisfied (S96: NO), and the routine goes to Step S92.

  In step S92, the controller 31 uses the daytime boiling point increase control unit 42 to determine whether or not the hot water storage temperature sensor 18 at the uppermost portion of the hot water storage tank 10 is less than the minimum hot water storage amount. Judgment is made based on whether or not the temperature has dropped to below the temperature. If the temperature is higher than the hot water danger temperature, the determination in step S92 is not satisfied (S92: NO), and the same procedure is repeated by returning to step S96. If it is below the hot water danger temperature, the determination in step S92 is satisfied (S92: YES), and it is considered that the hot water is out, and the process proceeds to step S94.

  In step S94, the control device 31 controls the heat pump device 19 by the daytime boiling increase control unit 42, and performs a hot water boiling increase operation for a predetermined time (for example, 1 hour) for eliminating the hot water shortage. Thereafter, the process returns to step S96 and the same procedure is repeated.

  As described above, according to the solar power generation apparatus cooperation hot water storage hot water supply system 100 of the present embodiment, the solar power generation apparatus 3 and the hot water storage hot water supply apparatus 1 are provided. The solar power generation device 3 can receive sunlight and generate electric power, and the hot water storage hot water supply device 1 uses the electric power generated by the solar power generation device 3 so that the heat pump device 19 is in the hot water storage tank 10. A boiling operation in which hot water is heated can be performed.

  Thus, when performing boiling operation using the electric power by photovoltaic power generation, the electric power value supplied to the hot water storage type hot water supply device 1 (specifically, for example, the electric load excluding the hot water storage type hot water supply device 1 from the generated electric power value The surplus power value obtained by subtracting the load power consumption value consumed by the device 6 needs to be large to some extent. Therefore, in order to smoothly perform the boiling operation, according to the present embodiment, the surplus power prediction unit 32E and the device usage power prediction unit 32D are provided. That is, the surplus power prediction unit 32E uses the generated power prediction value of the solar power generation device 3 that represents the temporal variation of the generated power value in the solar power generation device 3, and uses the surplus power for one day following the desired date. Determine the predicted power value. Moreover, the apparatus usage power prediction part 32D determines the apparatus usage power prediction value which the said hot water storage type hot water supply apparatus 1 consumes in the said next day. Thereafter, based on the surplus power prediction value and the device power consumption prediction value, the surplus boiling-up control unit 40 causes the surplus power prediction value to be consumed by the hot water storage water heater 1 in the daytime day of the next day. When it becomes above, the boiling operation by the hot water storage type hot water supply apparatus 1 is executed.

  At this time, when performing the elevating operation in the daytime day of the next day, the normal method (the purchase of power from outside the system) is performed in the nighttime period from the desired date to the next day, by the amount of the elevating amount by the daytime evaporative operation. The amount of boiling by the night boiling operation performed by the above-mentioned operation can be reduced, and the cost can be reduced.

  Therefore, if there is even a small amount of the high surplus power period in which the surplus power predicted value is equal to or greater than the apparatus power consumption predicted value, the daytime boiling operation is performed, and the amount of boiling by the daytime boiling operation is determined. It is conceivable to reduce boiling from the night boiling operation. However, if the daytime boiling operation is performed in a too short time, it may become inefficient.

  In order to avoid this, it is conceivable to perform the daytime boiling operation only when the high surplus power period continues to some extent (for example, a predetermined threshold value or more). However, in this case as well, if a period during which the predicted surplus power is less than the predicted power consumption for the device is sandwiched in the middle of the high surplus power period that continues for a relatively long time, (In spite of the possibility of cost reduction), there may be a waste of not performing a daytime boiling operation.

  Therefore, according to the present embodiment, the surplus boiling control unit 40 controls the heat pump device 19 based on the accumulated value of the high surplus power period on the next day. Specifically, for example, based on whether or not the cumulative value is a predetermined threshold value, when the cumulative value is equal to or greater than the threshold value, the daytime boiling operation is performed and the cumulative value is set to a threshold value. When the value is less than the value, the control of the heat pump device 19 is switched so that the daytime boiling operation is not performed.

  This prevents inefficiency as described above by switching to perform the daytime boiling operation when the high surplus power is generated to a certain extent and the accumulated value exceeds a threshold value. Can do. In addition, even if a period during which the predicted surplus power is less than the predicted power usage value of the apparatus is sandwiched in the middle of the high surplus power period as described above, the surplus power prediction value before and after that is Since the cumulative value of the period that is equal to or greater than the predicted value is equal to or greater than the threshold value, switching to perform the daytime boiling operation is performed, so that it is possible to prevent such waste.

  As a result, since the amount of boiling in the nighttime zone can be reduced according to the amount of boiling in the daytime boiling operation on the next day, the amount of power purchased during the nighttime boiling operation can be reduced and the cost can be reduced. Reduction can be achieved.

  In the present embodiment, in particular, the surplus boiling control unit 40 performs the boiling operation with the electric power from the solar power generation device 3 based on whether or not the accumulated value is equal to or greater than a predetermined threshold value. The heat pump device 19 is controlled so as to switch between performing and not performing. In this way, by switching execution / non-execution of the daytime boiling operation according to the magnitude of the threshold, it is possible to reliably prevent the inefficiency and waste.

  In the present embodiment, in particular, the surplus boiling control unit 40 is based on the accumulated value of the period in each of the plurality of boiling possible time zones (high surplus power periods). The heat pump device 19 is controlled to perform the boiling operation with electric power. As described above, the above-described inefficiency and waste can be surely prevented by controlling the daytime boiling operation based on the accumulated values of each of the plurality of time sections that become the high surplus power period.

  In the present embodiment, in particular, the control device 31 uses the electric power from the photovoltaic power generation device 3 based on the accumulated value on the next day at the start time of a predetermined night zone from the desired day to the next day. The surplus boiling up determination unit 33B that determines whether or not to perform a boiling operation is included, and the surplus boiling up control unit 40 is based on the determination result of the surplus boiling up determination unit 33B. The heat pump device 19 is controlled on the next day so as to switch whether or not to perform the boiling operation with the electric power from. In this way, whether or not to perform daytime boiling operation on the next day is determined on the desired day, which is the previous day, so that the daytime boiling operation is performed on the next day according to the amount of boiling during the daytime boiling operation. It is possible to reliably reduce the amount of boiling in the battery and reduce the amount of power purchased during the night-time boiling operation.

  The present invention is not limited to the above embodiment, and can be applied without changing the gist thereof. For example, each functional unit (the weather information acquisition unit 32A and the power generation unit provided in the HEMS device 7). The server 9 may include at least one of a power prediction unit 32B, a load power consumption prediction unit 32C, a device power consumption prediction unit 32D, a surplus power prediction unit 32E, and an outside air temperature prediction unit 32F).

  Further, in the above, the arrows shown in each drawing such as FIG. 2 show an example of the signal flow, and do not limit the signal flow direction.

  Further, the flowcharts shown in FIGS. 6 to 9 do not limit the present invention to the procedure shown in the above-described flow, but add / delete procedures or change the order within the scope of the invention and the technical idea. You may do.

1 Hot water storage hot water supply system (photovoltaic power generator linked hot water storage system)
3 Solar power generation device 10 Hot water storage tank 19 Heat pump device (heating means)
32D device power consumption prediction unit (device power consumption prediction means)
32E Surplus power prediction unit (surplus power prediction means)
33B Surplus boiling up determination unit (determination means)
40 Excess boiling control section (control means)
100 Solar power generation device cooperation hot water storage hot water system S10 step (surplus power acquisition means)

Claims (5)

A solar power generator,
A hot water storage tank for storing hot water, a heating means for heating the hot water, and a hot water storage hot water supply apparatus for performing a boiling operation in which the heating means heats the hot water in the hot water storage tank;
In a hot water storage system linked with a solar power generation device having
Surplus power prediction means for determining a surplus power prediction value in a specific period using the generated power prediction value of the solar power generation device;
Device power consumption prediction means for determining a device power consumption predicted value consumed by the hot water storage type hot water supply device in the specific period;
The heating means is controlled to perform the boiling operation with electric power from the photovoltaic power generation apparatus based on a cumulative value of a period in which the surplus power prediction value in the specific period is equal to or greater than the apparatus power consumption prediction value. Control means;
A hot water storage system linked with a solar power generation device, characterized by comprising: The control means includes
Controlling the heating means to switch whether or not to perform the boiling operation with electric power from the photovoltaic power generation device based on whether or not the cumulative value is equal to or greater than a predetermined threshold value. The photovoltaic power generation apparatus cooperation hot water storage hot water supply system according to claim 1 characterized by the above-mentioned. In the specific period, there are a plurality of time segments in which the surplus power prediction value is greater than or equal to the device power consumption prediction value,
The control means includes
The heating means is controlled so as to perform the boiling operation with electric power from the photovoltaic power generation apparatus based on the accumulated value of the period in each of the plurality of time sections. 2. The hot water storage hot water supply system linked with the solar power generation apparatus according to 2. The specific period is the next day of the desired date,
The solar power generation apparatus cooperation hot water storage hot water supply system further includes:
Whether or not to perform the boiling operation with electric power from the photovoltaic power generation device based on the accumulated value on the next day at a predetermined timing from the desired date to the start time of the predetermined nighttime zone on the next day A determination means for determining
The control means includes
The heating means is controlled on the next day so as to switch whether or not to perform the boiling operation with electric power from the photovoltaic power generation device based on a determination result of the determination means. The photovoltaic power generation apparatus cooperation hot water storage hot water supply system according to any one of claims 3 to 4. Solar power generation comprising a hot water storage tank for storing hot water and heating means for heating the hot water, and the heating means performing boiling operation for heating the hot water in the hot water storage tank in cooperation with a solar power generation device In the device-linked hot water storage system,
Surplus power acquisition means for acquiring a surplus power prediction value in a specific period based on the generated power prediction value of the solar power generation device;
Device power consumption prediction means for determining a device power consumption predicted value consumed by the hot water storage type hot water supply device in the specific period;
The heating means is controlled to perform the boiling operation with electric power from the photovoltaic power generation apparatus based on a cumulative value of a period in which the surplus power prediction value in the specific period is equal to or greater than the apparatus power consumption prediction value. Control means;
A hot water storage device linked with a solar power generation device, characterized by comprising: