WO2017145369A1

WO2017145369A1 - Hot-water supply system, and control method for water heater

Info

Publication number: WO2017145369A1
Application number: PCT/JP2016/055862
Authority: WO
Inventors: 正之小松; 圭 ▲柳▼本; 雄喜小川; 啓輔 ▲高▼山; 孝小川; 直樹茨田; 野村　智; 忠彦稲葉
Original assignee: 三菱電機株式会社
Priority date: 2016-02-26
Filing date: 2016-02-26
Publication date: 2017-08-31
Also published as: JPWO2017145369A1; GB2562926B; GB2562926A; GB2562926C; GB201811333D0; JP6641455B2

Abstract

A hot-water supply system (1) is equipped with a power conditioner (31) and a water heater. The power conditioner (31) is equipped with: an instruction acquisition unit (303) that acquires an instruction for suppressing the supply of power generated by a generating means to a commercial power system; and a power output unit (305) that, when the instruction acquisition unit (303) receives an instruction, outputs part of the power generated by the generating means, which is less than the generated power, for a period specified by the instruction. The water heater is equipped with: a surplus power information acquisition unit (605) that acquires surplus power information showing surplus power based on the difference between the power generated by the generating means and the power output by the power output unit (305) during the period specified by the instruction; and a boiling unit (604) that, when the surplus power information acquisition unit (605) acquires the surplus power information, boils water with a capacity corresponding to the surplus power.

Description

Hot water supply system and method for controlling hot water heater

The present invention relates to a hot water supply system and a method for controlling a water heater.

In recent years, technology utilizing natural energy represented by sunlight and wind power has attracted attention, and customers themselves often have power generation facilities that generate electricity using natural energy. Such a consumer can consume the power generated by the power generation facility by itself, and can supply surplus power to the commercial power system and sell it to the electric utility. Thereby, a consumer can reduce the electric power purchased from a commercial power grid, and can obtain an economic profit.

By the way, the supply and demand balance of the commercial power system may be disrupted by a reverse power flow in which power is supplied from the power generation facility of the customer to the commercial power system. For example, on a sunny holiday, the demand for power to the commercial power system decreases, and the amount of power generated by sunlight increases, so the supply of power from the power generation facility of the consumer to the commercial power system increases.

Therefore, in order to maintain the supply and demand balance of the commercial power system, the development of a system is in progress for an electric power company to specify a period for the consumer and to instruct the suppression of reverse power flow in advance. For example, in 2014, Japan's Agency for Natural Resources and Energy announced an output control rule for photovoltaic power generation. This output control rule is for adjusting the output of the power generated by the power generation facility to suppress the power sale to the commercial power system by the consumer.

Also, a technique for reducing the reverse power flow by consuming as much power as possible at the consumer has been proposed. For example, Patent Literature 1 discloses a technique for predicting a time zone in which a large amount of reverse power is generated and operating a heat pump hot water supply / room heating device including a hot water storage tank in the predicted time zone. Since the power consumption of a water heater provided with a hot water storage tank is generally large, according to the technique disclosed in Patent Document 1, the reverse power can be effectively reduced.

International Publication No. 2012/090365

However, the technique disclosed in Patent Document 1 does not reduce the reverse power flow according to the instruction for suppressing the reverse power flow as described above. In the period in which the suppression of reverse power flow is instructed, the output of the power generated by the power generation facility is suppressed, so that a power generation loss occurs. For this reason, it is required to reduce power generation loss during a period in which suppression of reverse power flow is instructed and to improve power utilization efficiency.

The present invention has been made to solve the above-described problems, and an object thereof is to provide a hot water supply system or the like that can improve the power use efficiency.

In order to achieve the above object, a hot water supply system according to the present invention includes:
A hot water supply system including a power conditioner and a water heater,
The inverter is
Instruction acquisition means for acquiring an instruction to suppress supply of the power generated by the power generation means to the commercial power system;
A power output means for outputting less power than the generated power out of the power generated by the power generation means in a period determined by the instruction when the instruction acquisition means acquires the instruction; ,
The water heater is
Surplus power information acquisition means for acquiring surplus power information indicating surplus power based on a difference between the power generated by the power generation means and the power output by the power output means in the period;
When the surplus power information acquisition means acquires the surplus power information, the surplus power information acquisition means comprises boiling means for boiling hot water with the capacity corresponding to the surplus power.

In the present invention, when the power conditioner obtains an instruction to suppress the supply of the electric power generated by the power generation means to the commercial power system, the power conditioner includes the power generated by the power generation means in a period determined by the instruction. Then, the electric power that is less than the generated electric power is output, and the hot water heater boils hot water with the capability according to the difference between the electric power generated by the electric power generation means and the electric power output by the power conditioner. Therefore, according to the present invention, the power use efficiency can be improved.

It is a figure showing the whole hot-water supply system composition concerning Embodiment 1 of the present invention. It is a block diagram which shows the structure of a power conditioner. It is a block diagram which shows the structure of a hot water supply controller. It is a block diagram which shows the functional structure of the hot water supply system which concerns on Embodiment 1. FIG. It is a figure which shows an example of the measurement data memorize | stored in measurement DB. It is a figure for demonstrating the control instruction | indication delivered by an electric power server. It is a figure which shows transition of the output electric power from the power generation equipment at the time of PV suppression. It is a figure which shows an example of the display screen by a power conditioner. It is a schematic diagram of the plan which shifts boiling operation from night to daytime. It is a figure which shows the 1st example of the display screen of a remote control at the time of PV suppression. It is a figure which shows the 2nd example of the display screen of a remote control at the time of PV suppression. It is a sequence diagram which shows the outline | summary of the process performed among an electric power server, a power conditioner, and a hot water supply controller. It is a flowchart which shows the flow of the suppression instruction | indication acquisition process performed by a power conditioner. It is a flowchart which shows the flow of the boiling plan production | generation process performed by the hot water supply controller. It is a flowchart which shows the flow of the output suppression process performed by a power conditioner. It is a flowchart which shows the flow of the phase control process performed by a power conditioner. It is a flowchart which shows the flow of the daytime boiling process performed by the hot water controller. It is a block diagram which shows the functional structure of the hot water supply system which concerns on Embodiment 2. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

(Embodiment 1)
In FIG. 1, the whole structure of the hot water supply system 1 which concerns on Embodiment 1 of this invention is shown. The hot water supply system 1 is a system that manages the power consumed in the house H by controlling the operation of the water heater 5 installed in the house H. The house H is a so-called general residential building, and is a demand place (consumption place) of power supplied from the commercial power system 8 and the power generation equipment 3.

As shown in FIG. 1, the hot water supply system 1 includes a hot water heater 5, a power generation facility 3, a plurality of devices 7 (devices 7-1, 7-2,...), And a router 12. The router 12 is connected to the power server 14 via a wide area network N such as the Internet.

The power generation facility 3 is a facility that is installed in the house H and generates power using sunlight, which is natural energy. Whereas the commercial power system 8 supplies power to an unspecified number of demand areas including the house H, the power generation facility 3 is owned by a customer in a specific demand area, and is supplied to the house H that is a specific demand area. It is a facility that supplies power. Such a power generation facility 3 is also referred to as a distributed power source.

The power generation facility 3 includes a PV panel 30 that performs photovoltaic power generation (PV: Photovoltaic) and a power conditioner (power conditioning system) 31 for PV. The PV panel 30 is, for example, a polycrystalline silicon type solar panel. The PV panel 30 is installed on the roof of the house H, and generates solar power by converting solar energy into electric energy. The PV panel 30 functions as power generation means (power generation unit). The power conditioner 31 receives supply of electric power generated by the PV panel 30 and outputs the supplied electric power to the distribution board 9 via the power line D2.

FIG. 2 shows the configuration of the power conditioner 31. As shown in FIG. 2, the power conditioner 31 includes an inverter 32, a control unit 33, a storage unit 36, and a communication unit 37.

The inverter 32 functions as a power conversion unit that converts power. The inverter 32 converts the DC power supplied from the PV panel 30 into AC power with a specified conversion efficiency so that it can be used in the house H, and outputs the AC power to the power line D2. Thereby, the inverter 32 supplies the electric power generated by the PV panel 30 to the house H and the commercial power system 8 which are power demand areas (consumption areas).

The control unit 33 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an RTC (Real Time Clock), although not shown. The CPU is also called a central processing unit, a central processing unit, a processor, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like. The control unit 33 includes a generated power calculation unit 34 that calculates the power generated by the PV panel 30 and a state management unit 35 that manages the state of the power conditioner 31. In the control unit 33, the CPU reads the program and data stored in the ROM, and performs overall control of the power conditioner 31 using the RAM as a work area.

The storage unit 36 is a non-volatile semiconductor memory such as a flash memory, an EPROM (Erasable Programmable ROM), or an EEPROM (Electrically Erasable Programmable ROM), and serves as a so-called secondary storage device (auxiliary storage device). . The storage unit 36 stores various programs and data used by the control unit 33 for performing various processes, and various data generated or acquired by the control unit 33 performing various processes.

The communication unit 37 is connected to the communication adapter 38 under the control of the control unit 33 and includes a communication interface for communicating with the outside through the communication adapter 38. The communication unit 37 communicates with the hot water supply controller 54 and the router 12 of the water heater 5 through a communication network built in the house H. The communication network is, for example, a home appliance network that conforms to ECHONET Lite or a serial communication network that conforms to the RS232C standard.

Further, the communication unit 37 is connected to the wide area network N via the router 12 and communicates with the power server 14 via the wide area network N. For example, the communication unit 37 acquires a PV suppression instruction distributed from the power server 14 via the router 12 and the wide area network N.

The communication unit 37 is connected via a communication adapter 38 to CT (Current Transformer) 1 and CT 2 which are sensors for measuring an alternating current. CT1 and CT2 are installed on a power line D1 disposed between the commercial power system 8 and the distribution board 9, and a power line D2 disposed between the power generation facility 3 and the distribution board 9, respectively. ing.

CT1 disposed on the power line D1 measures the power P1 supplied from the commercial power system 8 to the house H. This electric power P1 corresponds to electric power (electric power purchased) purchased from an electric power company by a consumer who demands electric power in the house H. CT2 disposed on the power line D2 measures the power P2 output from the power generation facility 3 to the distribution board 9. The electric power P 2 is supplied to the house H among the electric power generated by the power generation facility 3, and corresponds to electric power that can be used in the house H. The communication part 37 acquires the measured value of electric power P1, P2 measured by CT1 and CT2.

The sum of the electric power P1 flowing through the electric power line D1 and the electric power P2 flowing through the electric power line D2 is that of the house H, which is a place where electric power is demanded, when a storage battery such as a stationary storage battery or an electric vehicle is not installed in the house H. It corresponds to the total power consumption. That is, when the total power consumption of the house H is expressed as Pc, a relational expression of Pc = P1 + P2 is established. The total power consumption of the house H will be described as including power consumed at the site of the house H.

When the power P2 output from the power generation facility 3 exceeds the total power consumption Pc of the house H, surplus power is generated in the house H. When surplus power is generated, a consumer of the house H can sell (sell) power to an electric power company by supplying surplus power to the commercial power system 8 as reverse power. Thus, returning power from the consumer side to the electric utility side by supplying power from the house H to the commercial power grid 8 is referred to as “reverse power flow”. While the reverse power flow is occurring, P1 flowing through the power line D1 has a negative value.

Subsequently, returning to FIG. 1, the explanation of the water heater 5 is started. The hot water heater 5 is a hot water storage type hot water heater including a heat pump unit 50 and a tank unit 51. The heat pump unit 50 and the tank unit 51 are connected by a pipe 52 through which hot water flows. The water heater 5 is electrically connected to the commercial power system 8 and the power generation equipment 3 via the power line D3 branched by the distribution board 9, and is supplied from either the commercial power system 8 or the power generation equipment 3 Get the power you need to work. Hereinafter, the water heater 5 will be described.

The heat pump unit 50 of the water heater 5 includes a compressor, a first heat exchanger, an expansion valve, a second heat exchanger, a blower, a control board, and the like, although not shown in the figure. The compressor, the first heat exchanger, the expansion valve, and the second heat exchanger are annularly connected to form a refrigeration cycle circuit for circulating the refrigerant. The refrigeration cycle circuit is also called a refrigerant circuit.

Compressor increases temperature and pressure by compressing refrigerant. The compressor includes an inverter circuit that can change a capacity (a delivery amount per unit) according to a driving frequency. The compressor changes the capacity according to the instruction from the control board.

The first heat exchanger is a heating source for heating the city water up to the target boiling temperature. The boiling temperature is also called hot water storage temperature. The first heat exchanger is a plate-type or double-tube type heat exchanger, and performs heat exchange between the refrigerant and water (low-temperature water). By heat exchange in the first heat exchanger, the refrigerant dissipates heat and the water absorbs heat.

The expansion valve expands the refrigerant to lower the temperature and pressure. The expansion valve changes the valve opening according to an instruction from the control board.

The second heat exchanger performs heat exchange between the outside air sent by the blower and the refrigerant. The refrigerant absorbs heat and the outside air dissipates heat by heat exchange in the second heat exchanger.

The control board includes a CPU, a ROM, a RAM, a communication interface, a readable / writable nonvolatile semiconductor memory, and the like. The control board is communicably connected to each of the compressor, the expansion valve, and the blower via a communication line, and controls these operations. Further, the control board is communicably connected to the hot water supply controller 54 of the tank unit 51 via a communication line (not shown).

The tank unit 51 includes a hot water storage tank 53, a hot water supply controller 54, a mixing valve 56, and the like. These components are housed in a metal outer case.

The hot water storage tank 53 is made of metal such as stainless steel or resin. A heat insulating material (not shown) is disposed outside the hot water storage tank 53. Thereby, in hot water storage tank 53, hot water (henceforth high temperature water) can be kept warm for a long time. The temperature of the high-temperature water is, for example, 60 degrees or 70 degrees.

The hot water controller 54 is a control device that controls the hot water heater 5 in an integrated manner. The hot water controller 54 is communicably connected to the control board of the heat pump unit 50 via a communication line (not shown). The hot water supply controller 54 is communicably connected to the remote controller 55 via the communication line 59.

FIG. 3 shows the configuration of the hot water controller 54. As shown in FIG. 3, the hot water supply controller 54 includes a control unit 61, a storage unit 62, a timer unit 63, and a communication unit 64. These units are connected via a bus 69.

The control unit 61 includes a CPU, a ROM, a RAM, and the like (not shown). The CPU is also called a central processing unit, a central processing unit, a processor, a microprocessor, a microcomputer, or a DSP. In the controller 61, the CPU reads out the program and data stored in the ROM, and controls the hot water supply controller 54 using the RAM as a work area.

The storage unit 62 is, for example, a nonvolatile semiconductor memory such as a flash memory, EPROM, or EEPROM, and plays a role as a so-called secondary storage device (auxiliary storage device). The storage unit 62 stores various programs and data used by the control unit 61 to perform various processes, and various data generated or acquired by the control unit 61 performing various processes.

The timekeeping unit 63 includes an RTC, and is a timekeeping device that keeps timekeeping even when the hot water supply controller 54 is turned off.

The communication unit 64 includes a communication interface for communicating via the communication network described above built in the house H under the control of the control unit 61. The communication unit 64 communicates with the power conditioner 31 and the router 12 of the power generation facility 3 via a communication network. The communication unit 64 is connected to the wide area network N via the router 12 and communicates with the power server 14 via the wide area network N.

In addition, the communication unit 64 includes an interface for communicating with the remote control 55 and the control board of the heat pump unit 50. The communication unit 64 receives an operation command from the remote controller 55 and transmits display data to the remote controller 55. In addition, the communication unit 64 transmits an operation command to the heat pump unit 50. The hot water supply controller 54 may be connected to a communication network via an external communication adapter (not shown).

The communication unit 64 is connected to CT3 which is a sensor for measuring an alternating current. CT3 is installed on a power line D3 disposed between the distribution board 9 and the water heater 5, and measures the power P3 supplied from the distribution board 9 to the water heater 5. The electric power P3 corresponds to electric power consumed in the water heater 5.

Returning to the description of the water heater 5 shown in FIG. The remote controller 55 is a terminal device for displaying the operating state and hot water storage state of the water heater 5 and presenting them to the user. The remote controller 55 is installed in a bathroom, a washroom, a kitchen, or the like in the house H, and receives an operation input related to boiling or hot water supply from the user.

The remote controller 55 is not shown, but includes a CPU, ROM, RAM, a readable / writable nonvolatile semiconductor memory, an input device such as a push button, a touch panel or a touch pad, a display device such as an organic EL display or a liquid crystal display, and A communication interface is provided.

At the start of the boiling operation (boiling operation), the hot water in the hot water storage tank 53 is consumed, and low temperature water close to the city water temperature is stored in the lower part of the hot water storage tank 53. By operating a pump (not shown), this low-temperature water enters the above-described first heat exchanger of the heat pump unit 50, and the temperature is raised by heat exchange with the refrigerant to become high-temperature water. This high temperature water is returned to the upper part of the hot water storage tank 53, and in the hot water storage tank 53, high temperature water stays in the upper part and low temperature water stays in the lower part to form a temperature stratification, and a temperature boundary is formed between the high temperature water and the low temperature water. A layer is generated.

When the boiling amount increases and the area of the high-temperature water increases, the temperature boundary layer approaches the lower part of the hot water storage tank 53, and the temperature of the water entering the first heat exchanger (incoming water temperature) gradually increases.

A hot water discharge pipe is connected to the upper part of the hot water storage tank 53, and hot water discharged from the hot water storage tank 53 through the hot water discharge pipe is mixed with city water by the mixing valve 56. Thereby, it becomes hot water of the temperature (for example, 40 degreeC) which a user desires, for example, is supplied to hot-water supply terminals, such as the shower 57 or the faucet 58 arrange | positioned in a bathroom, a washroom, or a kitchen. At this time, in the hot water storage tank 53, city water is supplied from the water supply pipe connected to the lower part by the volume of the hot water flowing out from the upper part and the water pressure. As a result, the temperature boundary layer moves upward in the hot water storage tank 53. When hot water decreases, the water heater 5 performs additional boiling.

The device 7 (devices 7-1, 7-2,...) Is an electric device such as an air conditioner, an illuminator, a floor heating system, a refrigerator, an IH (Induction Heating) cooker, or a television. The devices 7-1, 7-2,... Are installed in the house H (including its site) and are connected to the commercial power system 8 and the power generation facilities via the power lines D4, D5,. 3 is electrically connected.

The router 12 is a device that can communicate with the power server 14 via the wide area network N, and is, for example, a broadband router. The hot water controller 54 and the power conditioner 31 communicate with the power server 14 via the router 12.

The power server 14 is a server operated by an electric power company that provides commercial power to each consumer by the commercial power system 8. The power server 14 is communicably connected to the power conditioner 31 of the power generation facility 3 installed in the demand area of each consumer via the wide area network N.

Next, a functional configuration of the hot water supply system 1 will be described with reference to FIG.

As shown in FIG. 4, the power conditioner 31 functionally includes a measurement value acquisition unit 301, an instruction acquisition unit 303, an instruction information transmission unit 304, a power output unit 305, a surplus power calculation unit 306, A surplus information transmission unit 307 and a display control unit 309 are provided. Each of these functions is realized by software, firmware, or a combination of software and firmware. The software and firmware are described as programs and stored in the ROM or the storage unit 36. And in the control part 33, CPU implement | achieves the function of each part by executing the program memorize | stored in ROM or the memory | storage part 36. FIG.

In addition, the power conditioner 31 includes a measurement DB (Database) 310 and an instruction DB 320. The measurement DB 310 and the instruction DB 320 are constructed in the storage area of the storage unit 36.

The measurement value acquisition unit 301 acquires the measurement value of the power P1 supplied from the commercial power system 8 to the house H and the measurement value of the power P2 output from the power generation facility 3. As described above, the power P1 supplied from the commercial power system 8 to the house H is measured by CT1 disposed on the power line D1. Moreover, the electric power P2 output from the electric power generation equipment 3 is measured by CT2 arrange | positioned by the electric power line D2. The measured value acquisition unit 301 acquires the measured value of the electric power P1 supplied from the commercial power system 8 to the house H, so that the reverse power (−P1) supplied to the commercial power system 8 out of the generated power Pa. Can also be obtained.

The measurement value acquisition unit 301 acquires the measurement values of the electric powers P1 and P2 obtained by CT1 and CT2 periodically or as needed via the communication unit 37. The measurement value acquisition unit 301 is realized by the control unit 33 cooperating with the communication unit 37.

Measurement DB310 memorize | stores the measured value of electric power P1 and P2 which were acquired by the measured value acquisition part 301. FIG. The measurement DB 310 stores the acquired measurement values each time the measurement value acquisition unit 301 acquires the measurement values of the electric powers P1 and P2, and constructs a database.

FIG. 5 shows a specific example of measurement data stored in the measurement DB 310. As illustrated in FIG. 5, the measurement DB 310 stores the power amount of the purchased power P1, the power amount of the output power P2, and the phase angle of the output power P2 in chronological order. The electric energy is an integrated value of electric power over a predetermined time. The phase angle is a phase difference between the voltage and current at the output power P2, and is also called a power factor angle. When the measurement value acquisition unit 301 acquires the measurement values of the powers P1 and P2 from the power measurement device 4, the measurement value acquisition unit 301 calculates the power amounts of the powers P1 and P2 and the phase angle of the power P2, and sequentially stores the power amount and the phase angle in the measurement DB 310. Store it.

The instruction acquisition unit 303 acquires an instruction for suppressing supply of the power generated by the PV panel 30 to the commercial power system 8. The instruction to suppress the supply of power to the commercial power system 8 is a PV suppression instruction (suppression instruction) distributed by the power server 14. Hereinafter, the suppression instruction delivered by the power server 14 will be described.

When a specific condition is satisfied, the power server 14 supplies power to the commercial power system 8 from the power generation equipment 3 of each consumer during a specific period, for each consumer who owns the power generation equipment 3. That is, an instruction to suppress reverse power flow is distributed. The reason for suppressing the reverse flow in this way is to prevent the supply and demand balance of the commercial power system 8 from being disrupted due to excessive supply of power from the consumer to the commercial power system 8. Below, the instruction | indication which suppresses the reverse power flow delivered by the electric power server 14 is called "suppression instruction | indication", and the output of the power generation equipment 3 is controlled and the reverse power flow is suppressed "PV suppression". PV suppression is also referred to as “output suppression” or “output control”.

Specifically, the power server 14 obtains weather information such as weather forecast, solar radiation amount, and sunshine duration at the place where the power generation equipment 3 of each consumer is installed from a weather operator, and creates a PV suppression schedule. To do. And the electric power server 14 delivers a suppression instruction | indication to each consumer by the day before the day which implements PV suppression according to the created schedule. The implementation period of PV suppression is usually a period in which the power generated by the power generation facility 3 is excessive with respect to the supply and demand situation of the commercial power system 8, for example, a daytime period in a fine day when a large amount of solar radiation is expected. In addition, the electric power server 14 does not distribute a suppression instruction | indication on the day when it is not necessary to implement PV suppression.

The suppression instruction distributed by the power server 14 includes time information indicating a specific period for performing PV suppression and instruction value information indicating an instruction value for output restriction of the power generation facility 3 at the time of PV suppression. More specifically, the suppression instruction is information on a specific time zone on a specific day, that is, date and time (start time and end time) at which PV suppression is performed, as a specific period for performing PV suppression. Is specified.

Moreover, the suppression instruction | indication is the electric power output by the power generation equipment 3 of the electric power output from the power conditioner 31 of the power generation equipment 3 to the distribution board 9 of the house H as an instruction | indication value of the output restriction of the power generation equipment 3 at the time of PV suppression Specify the ratio (%) to the rated value of. Here, the rated value of the generated power of the power generation facility 3 means the maximum power value that the power generation facility 3 can safely output under appropriate conditions, and specifically, the rated capacity and power of the PV panel 30. This corresponds to the smaller of the rated capacity of the conditioner 31.

FIG. 6 shows a specific example of the suppression instruction distributed by the power server 14. A solid line La in FIG. 6 represents a transition of the generated power by the power generation facility 3 when PV suppression is not instructed, and shows a large value in the daytime with a peak at noon when the amount of solar radiation increases. On the other hand, the broken line Lp in FIG. 6 represents the transition of the instruction value for the output restriction of the power generation facility 3 specified by the suppression instruction.

In the example of FIG. 6, the power output from the power generation equipment 3 is set to 40% of the rated value (for example, 2% with respect to the rated value of 5.0 kW) in the time zone from 9:00 to 11:00 and from 13:00 to 15:00. .0.0 kW) is specified. In addition, it is specified that the power output from the power generation facility 3 is suppressed to 0% of the rated value in the time zone from 11:00 to 13:00, that is, the power generated by the power generation facility 3 is not output at all. . In other words, the power output from the power generation facility 3 is suppressed during the time period from 9:00 to 15:00 when the indicated value is less than 100%. On the other hand, in the time zone from 0 o'clock to 9 o'clock and 15 o'clock to 24 o'clock when the indicated value is 100%, the power output from the power generation facility 3 is not substantially suppressed.

In the suppression instruction, the PV suppression schedule is specified in units of 30 minutes, for example, and the output instruction value of the power generation facility 3 is specified in units of 1%, for example. In the suppression instruction, the instruction value may be specified in units of power (for example, kW units) instead of the ratio of the generated power to the rated value. For example, as shown in FIG. 6, when the indicated value of 40% corresponds to the output power of 2.0 kW and the indicated value of 0% corresponds to the output power of 0 kW, the suppression instruction is output from the power generation facility 3. As an instruction value of power to be transmitted, it may be specified as 2.0 kW and 0 kW.

Hereinafter, the value indicating the indicated value in the unit of electric power is referred to as “indicated electric power”. The command power corresponds to a value obtained by multiplying the rated value of the generated power by the command value when the command value is specified as a percentage, and corresponds to the command value itself when the command value is specified as power. .

When the power server 14 distributes the suppression instruction, the instruction acquisition unit 303 acquires the distributed suppression instruction via the wide area network N and the communication unit 37. When acquiring the suppression instruction, the instruction acquisition unit 303 stores the content of PV suppression such as the schedule and the instruction value specified by the acquired suppression instruction in the instruction DB 320. The instruction acquisition unit 303 is realized by the control unit 33 cooperating with the communication unit 37.

Returning to FIG. 4, the instruction DB 320 stores the content of the suppression instruction acquired by the instruction acquisition unit 303. Specifically, the content of the suppression instruction is a PV suppression schedule and an instruction value specified by the suppression instruction. The instruction DB 320 updates the stored PV suppression schedule and instruction value each time the instruction acquisition unit 303 acquires a suppression instruction from the power server 14.

The instruction information transmission unit 304 transmits instruction information indicating the content of the suppression instruction to the water heater 5 when the instruction acquisition unit 303 acquires the suppression instruction. Specifically, the content of the suppression instruction includes the fact that PV suppression has been instructed and the date and time. When the instruction acquisition unit 303 acquires a suppression instruction, the instruction information transmission unit 304 generates instruction information indicating the content of such a suppression instruction. And the instruction information transmission part 304 transmits the produced | generated instruction information to the hot water heater 5 via the communication network constructed | assembled in the house H by 23:00 on the day before the implementation day of PV suppression. The instruction information transmission unit 304 is realized by the control unit 33 cooperating with the communication unit 37.

When the instruction acquisition unit 303 acquires the suppression instruction, the power output unit 305 outputs less power than the generated power among the power generated by the PV panel 30 during the period determined by the suppression instruction. The period determined by the suppression instruction is a PV suppression execution period instructed by the suppression instruction. When the PV suppression implementation period arrives, the power output unit 305 controls the inverter 32 to suppress the power output to the power line D2 from the generated power supplied from the PV panel 30 to the power conditioner 31. . As a result, not all of the power generated by the PV panel 30 is output to the power line D2, less power than the generated power is output, and the remaining power is not output. In the following description, output of less power than the generated power includes that no power is output. The power output unit 305 is realized by the control unit 33 cooperating with the inverter 32.

The power output unit 305 executes phase advance phase control as a method of suppressing output power. More specifically, the power output unit 305 suppresses the output power by controlling the phase of the power. In other words, the power output unit 305 decreases the output active power by shifting the phase of the current from the phase of the voltage during the PV suppression period.

FIG. 7 shows the transition of output power from the power conditioner 31 when PV is suppressed. A one-dot chain line Lc in FIG. 7 represents a transition of the total power consumption of the house H, and generally shows a large value from the afternoon to the evening when the power consumption amount in the home increases. On the other hand, the thick solid line L2 in FIG. 7 represents the transition of the power output from the power conditioner 31 among the power generated by the PV panel 30, that is, the power P2 flowing through the power line D2.

In the example illustrated in FIG. 7, the power output unit 305 does not suppress the output from the power conditioner 31 in the periods T1 and T4 in which PV suppression is not performed. Therefore, the output power P2 from the power conditioner 31 represented by the thick solid line L2 is equal to the generated power that can be output by the power conditioner 31 represented by the thin solid line La. The generated electric power that can be output by the power conditioner 31 is electric power obtained by multiplying the electric power generated in the PV panel 30 (panel generated electric power) by a specified conversion efficiency. Hereinafter, the electric power (generated electric power) generated by the PV panel 30 and the electric power that can be output from the power conditioner 31 is represented as Pa, and the electric power (output electric power) P2 actually output from the power conditioner 31 is expressed as Pa. To distinguish. The generated power Pa that can be output by the power conditioner 31 is simply referred to as “generated power Pa” or the like.

On the other hand, in the periods T2 and T3 in which PV suppression is performed, the power output unit 305 suppresses the output from the power conditioner 31. Therefore, the output power P2 represented by the thick solid line L2 is smaller than the generated power Pa represented by the thin solid line La.

More specifically, among the periods T2 and T3 in which the PV suppression is performed, in the period T2, the total power consumption Pc of the house H represented by the alternate long and short dash line Lc is the command power (2. 0 kW). In this case, the power output unit 305 suppresses the output power P2 from the power conditioner 31 to the command power as represented by the thick solid line L2. Such an operation mode of the power output unit 305 is referred to as an “output suppression mode”.

On the other hand, among the periods T2 and T3 in which PV suppression is performed, in the period T3, the total power consumption Pc of the house H represented by the alternate long and short dash line Lc is indicated power (2.0 kW) represented by the broken line Lp. Larger) In this case, the power output unit 305 suppresses the output power P2 from the power conditioner 31 only to the power equal to the total power consumption Pc, not to the indicated power, as represented by the thick solid line L2. However, the power output unit 305 suppresses the output power P2 to be equal to the generated power Pa in a period in which the generated power Pa is smaller than the total power consumption Pc, for example, as in the period immediately before 15:00 in FIG. . Such an operation mode of the power output unit 305 is referred to as “reverse flow zero mode”.

7 shows the relationship between generated power Pa and lost power at time t1 included in period T2 and time t2 included in period T3. Here, the loss power is a power generation loss and is a power (Pa−P2) that is not output from the power conditioner 31 even though it is generated by the PV panel 30. At time t1 (output suppression mode) included in the period T2, the output power P2 is suppressed to the command power, so the power loss is relatively large. On the other hand, at time t2 (reverse power flow zero mode) included in the period T3, the output power P2 is suppressed only to power equal to the total power consumption Pc, so the power loss of the power generation facility 3 is relatively small. For this reason, at the time of PV suppression, if the total power consumption Pc is increased so as to exceed the command power, the power loss can be reduced.

In addition, at time t1 (output suppression mode) included in the period T2, the output power P2 suppressed up to the command power is larger than the total power consumption Pc, so that the power corresponding to the difference (P2-Pc) is used as surplus power. Surplus. This surplus power is sold to the commercial power system 8 as reverse power. On the other hand, at time t2 included in the period T3, since the output power P2 and the total power consumption Pc are equal, neither power purchase nor power sale occurs.

Returning to FIG. 4, the surplus power calculator 306 calculates the surplus power. The surplus power is the surplus power that can be output by the power conditioner 31 among the power Pa generated by the PV panel 30. In other words, the surplus power is power that is not output from the power conditioner 31 due to output suppression even though the equipment in the house H including the water heater 5 can be consumed during the PV suppression period. More specifically, the surplus power corresponds to the loss power shown in the lower part of FIG. The surplus power calculation unit 306 is realized by the generated power calculation unit 34 in the control unit 33.

The surplus power calculation unit 306 calculates the surplus power based on the difference between the power Pa generated by the PV panel 30 and the power P2 output by the power output unit 305 in the PV suppression implementation period. Here, the generated power Pa by the PV panel 30 cannot be directly measured while the PV suppression is being performed. Therefore, the surplus power calculation unit 306 uses the phase angle of the output power P2 in the period before the PV suppression execution period in order to acquire the generated power Pa.

Specifically, the surplus power calculation unit 306 multiplies the rated value of the generated power Pa by the power factor of the power P2 output by the power output unit 305 before the PV suppression implementation period, thereby reducing the PV suppression. Generated power Pa in the implementation period is calculated. The power factor of the output power P2 is obtained by calculating from the phase difference between the voltage and current at the output power P2. As described above, the rated value of the generated power Pa is the maximum power value that the power generation facility 3 can safely output under appropriate conditions. The rated value of the generated power Pa is stored in advance in the ROM or the storage unit 36.

The surplus power calculation unit 306 refers to the phase angle data stored in the measurement DB 310 and calculates the average value of the phase angle in a predetermined period immediately before the PV suppression execution period starts. The predetermined period is, for example, 5 minutes or 10 minutes. Then, the surplus power calculation unit 306 calculates the power factor of the output power P2 by calculating the cosine of the average value of the phase angles, and multiplies the rated value of the generated power Pa by the obtained power factor to suppress the PV. The estimated value of the generated power Pa in the implementation period is calculated.

The surplus power calculation unit 306 calculates the surplus power by subtracting the power P2 output by the power output unit 305 during the PV suppression period from the calculated generated power Pa. The output power P 2 during the PV suppression implementation period can be acquired as a measurement value by the measurement value acquisition unit 301. The surplus power calculation unit 306 calculates the difference between the estimated value of the generated power Pa and the measured value of the output power P2 as the surplus power. For example, when the rated value of the generated power Pa is 6.0 kW, the power factor is 0.9, and the measured value of the output power P2 is 4.0 kW, 1.4 kW (= 6.0 kW × 0.9-4. 0 kW) is calculated as surplus power.

The surplus power information transmission unit 307 transmits surplus power information indicating the surplus power calculated by the surplus power calculation unit 306 to the water heater 5. More specifically, the surplus power information transmission unit 307 averages the surplus power calculated by the surplus power calculation unit 306 in a predetermined period during the PV suppression period, and indicates surplus power indicating the averaged surplus power. Is generated. The predetermined period is, for example, 30 minutes. Then, the surplus power information transmission unit 307 transmits the generated surplus information to the water heater 5 via the communication network built in the house H. The surplus information transmitting unit 307 is realized by the control unit 33 cooperating with the communication unit 37.

The display control unit 309 communicates with a user interface (not shown) via the communication unit 37, and displays a display screen corresponding to the situation on the display device of the user interface. The display control unit 309 is realized by the control unit 33 cooperating with the communication unit 37.

FIG. 8 shows an example of a display screen by the power conditioner 31. Based on the measurement value stored in the measurement DB 310 and the result of the suppression process by the power output unit 305, the display control unit 309 displays the current power generation amount, the suppression amount suppressed by the power conditioner 31 during PV suppression, and the like. And displayed on the display unit 40 of the user interface.

Next, the functional configuration of the hot water supply controller 54 will be described. As shown in FIG. 4, the hot water supply controller 54 functionally includes an instruction information acquisition unit 601, a plan generation unit 602, a remaining power information acquisition unit 605, a boiling unit 604, a display control unit 608, and an operation reception. Unit 609. Each of these functions is realized by software, firmware, or a combination of software and firmware. The software and firmware are described as programs and stored in the ROM or the storage unit 62. And in the control part 61, CPU implement | achieves the function of each part by executing the program memorize | stored in ROM or the memory | storage part 62. FIG.

In addition, the hot water supply controller 54 includes a learning DB 610. The learning DB 610 is constructed in a storage area in the storage unit 62.

The instruction information acquisition unit 601 acquires instruction information transmitted from the power conditioner 31. The instruction information is information transmitted by the instruction information transmission unit 304, such as the fact that PV suppression has been instructed and the date and time. The instruction information acquisition unit 601 acquires instruction information through a communication network built in the house H. The instruction information acquisition unit 601 is realized by the control unit 61 cooperating with the communication unit 64.

The plan generation unit 602 generates a boiling plan based on the instruction information when the instruction information acquisition unit 601 acquires the instruction information. The boiling plan defines a start time, an end time, a boiling time, a boiling amount, a boiling capacity, and the like of a boiling operation. When a predetermined time of the day (for example, 23:00) arrives, the plan generating unit 602 refers to the learning DB 610 and generates the next day's boiling plan. The generated plan is stored in the RAM or the storage unit 62. The plan generation unit 602 is realized by the control unit 61 cooperating with the storage unit 62.

The learning DB 610 is a database that stores data such as the amount of boiling water and the amount used (hot water supply amount) up to the previous day. The plan generation unit 602 predicts the amount of hot water to be used on the next day with reference to the boiling amount and usage amount up to the previous day stored in the learning DB 610. Then, the control unit 61 determines a target boiling amount from the predicted amount of hot water used the next day and the amount of hot water remaining in the hot water storage tank 53.

When the boiling amount is determined, the plan generation unit 602 determines the time for boiling the hot water. Usually, the water heater 5 boils up the amount of hot water required for one day at night when the power purchase unit price is low, and boils hot water only when the amount of hot water is insufficient at other times. Therefore, when PV suppression is not performed on the next day, the plan generation unit 602 generates a plan for boiling all the determined boiling amount of hot water at night as a boiling plan.

On the other hand, when PV suppression is performed the next day, the power loss generated during PV suppression can be reduced by performing the boiling operation during the daytime when PV suppression is performed. Therefore, when the instruction information acquisition unit 601 acquires instruction information indicating that PV suppression will be performed the next day, the plan generation unit 602 boils a part of the determined amount of hot water at night as a boiling plan. Generate a plan to raise and boil the rest during daytime PV suppression.

Fig. 9 schematically shows a plan for shifting boiling operation from night to daytime. In the case where PV suppression is not performed on the next day, the plan generation unit 602 plans to boil up all of the target boiling amount of hot water during the night time including the portion indicated by the dotted line in FIG. Generate. On the other hand, when PV suppression is performed on the next day, the plan generation unit 602 indicates a part of the boiling operation to be performed at night when PV suppression is not performed on the next day (indicated by a broken line in FIG. 9). Generate a plan to shift the part) in the daytime.

Returning to FIG. 4, the boiling unit 604 communicates with the control board of the heat pump unit 50 to boil hot water by controlling the heat pump unit 50. Boiling hot water means that the low temperature water in the hot water storage tank 53 is heated to high temperature water by the heat pump unit 50 and the high temperature water is supplied to the hot water storage tank 53. The boiling unit 604 is realized by the control unit 61 cooperating with the time measuring unit 63 and the communication unit 64.

More specifically, the boiling unit 604 boils hot water according to the boiling plan generated by the plan generating unit 602. More specifically, when the instruction information acquisition unit 601 does not acquire instruction information on which PV suppression is performed on the next day, the boiling unit 604 follows the night boiling plan generated by the plan generation unit 602 according to the target. Boil all the boiling water at night.

On the other hand, when the instruction information acquisition unit 601 acquires instruction information on which PV suppression is performed on the next day, the boiling unit 604 performs the first operation at night before the PV suppression execution period determined by the instruction information. An amount of hot water is boiled, and a second amount of hot water is boiled with the capacity corresponding to the remaining power in the daytime, which is the implementation period of PV suppression. The first amount is a night boiling amount determined in the night boiling plan. The second amount is the daytime boiling amount determined in the daytime boiling plan, and corresponds to an amount obtained by subtracting the first amount from the target boiling amount. In this way, the boiling unit 604 boils the target boiling amount of hot water in two portions according to the night boiling plan and the day boiling plan generated by the plan generating unit 602.

The surplus power information acquisition unit 605 acquires surplus information from the power conditioner 31 in a period determined by the suppression instruction. The surplus power information is information based on the difference between the power Pa generated by the PV panel 30 and the power P2 output by the power output unit 305 transmitted by the surplus information transmitting unit 307, Specifically, it is information indicating the surplus power of the power generation facility 3. The surplus information acquisition unit 605 acquires surplus information via a communication network built in the house H. The surplus power information acquisition unit 605 is realized by the control unit 61 cooperating with the communication unit 64.

When the surplus power information acquisition unit 605 acquires the surplus power information, the boiling unit 604 determines the difference between the capacity according to the surplus power, in other words, the power Pa generated by the PV panel 30 and the power P2 output by the power output unit 305. Boiling hot water with the ability according to.

Here, the capacity (hereinafter referred to as “boiling capacity”) is an index indicating how fast the water heater 5 can boil hot water. The boiling capacity is also called a boiling level. The water heater 5 is preset with a plurality of stages of boiling capacity. The higher the boiling capacity, the shorter the time for boiling hot water at a desired temperature, and the power consumption of the water heater 5 increases. The lower the boiling capacity is, the longer the time for boiling hot water at a desired temperature is, and the power consumption of the water heater 5 is reduced. The boiling unit 604 controls the driving frequency of the compressor in the heat pump unit 50, and changes the boiling capacity by changing the amount of feed per unit from the compressor.

The capacity according to the surplus power means a boiling capacity that can be set in a range where the increase in power consumption in the water heater 5 is smaller than the surplus power. In other words, when the surplus power information acquisition unit 605 acquires the surplus power information, the boiling unit 604 increases the power consumption in the water heater 5 by an amount smaller than the surplus power, and boils hot water. If demonstrating it concretely, the boiling part 604 will use electric power which reduced the value of the predetermined margin from the surplus power shown by the acquired surplus power information as upper limit electric power which can increase consumption in the water heater 5. calculate. For example, when the surplus power is 1.0 kW and the margin is 0.2 kW, the boiling unit 604 calculates the upper limit power as 0.8 kW.

The boiling unit 604 determines the boiling capacity so that the increase in power consumption in the water heater 5 is less than the upper limit power. For example, when the water heater 5 is in a standby state and does not consume power, the boiling unit 604 has a boiling point at which the increase in power consumption from 0 kW in the water heater 5 is smaller than the maximum power and maximized. Determine the raising ability. In addition, when the water heater 5 is in a boiling operation and has already consumed power, the boiling unit 604 is configured such that the amount of increase from the current power consumption in the water heater 5 is smaller than the upper limit power and is the maximum. Determine the boiling capacity to become.

In addition, the boiling unit 604 reduces the power consumption of the water heater 5 when the remaining power becomes smaller than a predetermined threshold while boiling the hot water. In other words, when the surplus power decreases, the boiling unit 604 decreases the boiling capacity in accordance with the decrease in the surplus power. For example, when the remaining power becomes smaller than a threshold value during boiling of hot water, the boiling unit 604 has a boiling capacity within a possible range (for example, one step or two steps) in order to suppress the occurrence of power purchase. ) Lower. The threshold value can be set as appropriate depending on how much power generation is allowed.

As described above, by changing the boiling capacity according to the surplus power, no power is purchased from the commercial power system 8, and the surplus power can be effectively utilized to the maximum extent.

The display control unit 608 communicates with the remote controller 55 via the communication unit 64, and displays a display screen corresponding to the situation on the display device of the remote controller 55. The operation accepting unit 609 communicates with the remote controller 55 via the communication unit 64 and accepts information input by the user operating the remote controller 55. The display control unit 608 and the operation reception unit 609 are realized by the control unit 61 cooperating with the communication unit 64, respectively.

10 and 11 show specific examples of display screens displayed on the remote controller 55 when PV is suppressed. As shown in FIGS. 10 and 11, the display control unit 608 is configured to display information related to the water heater 5 such as the current set temperature, the amount of stored hot water, and the boiling capacity level, as shown in FIGS. Information about the current power generation output amount, suppression amount, and power such as load is displayed together with various operation buttons. The load is the total power consumption Pc of the house H.

As shown in FIG. 10, when the current load is smaller than the sum of the power generation output amount and the suppression amount, there is surplus power. When the boiling capacity of the water heater 5 can be increased by the remaining power, the display control unit 608 displays a message “The boiling capacity can be increased to level 4”. Thereby, the display control unit 608 informs the user that there is sufficient power that can be consumed by the water heater 5, and prompts the user to increase the boiling capacity.

On the other hand, as shown in FIG. 11, when the current load exceeds the power generation output amount, there is no surplus power and power purchase occurs. In this case, the display control unit 608 displays a message “Purchasing power has been generated. Electricity can be avoided by lowering the boiling capacity to level 2.” Thereby, the display control unit 608 notifies the user that power purchase has occurred, and prompts the user to lower the boiling capacity.

On the display screen shown in FIG. 10 or FIG. 11, the user can input an operation by selecting a button for raising or lowering the boiling capacity of the water heater 5. The operation accepting unit 609 accepts an operation for increasing or decreasing the boiling capacity input by the user from the remote controller 55. The boiling unit 604 changes the boiling capacity of the water heater 5 according to the operation received by the operation receiving unit 609.

The flow of processing executed in the hot water supply system 1 configured as described above will be described with reference to FIGS.

FIG. 12 shows an outline of processing executed in the hot water supply system 1. FIG. 12 shows the hot water controller of the power server 14, the power conditioner 31 of the power generation equipment 3, and the hot water controller 5 after the PV restraint instruction is delivered from the power server 14 until the end of the PV restraint. The flow of the process performed by 54 is shown. If a plurality of PV suppression instructions are delivered from the power server 14, the processes shown in FIG. 12 are executed in parallel for each of the multiple PV suppressions.

When it is determined that the PV suppression is to be performed and the schedule and detailed contents are confirmed, the power server 14 distributes a PV suppression instruction (suppression instruction) to each consumer (step S1). When the suppression instruction is distributed from the power server 14, the power conditioner 31 executes processing for acquiring the distributed suppression instruction (step S2). FIG. 13 shows details of the suppression instruction acquisition process executed in step S2.

In the suppression instruction acquisition process shown in FIG. 13, the control unit 33 of the power conditioner 31 acquires the suppression instruction distributed from the power server 14 via the wide area network N (step S21). In step S 21, the control unit 33 functions as the instruction acquisition unit 303.

In step S21, the control unit 33 may acquire the suppression instruction at the timing when the suppression instruction is distributed from the power server 14. Alternatively, the control unit 33 may acquire a suppression instruction from the power server 14 by accessing the power server 14 by itself when a predetermined timing such as once or twice a day arrives.

When the suppression instruction is acquired, the control unit 33 waits until the day before the day when the PV suppression is performed (step S22). And when it becomes the day before the day when PV suppression is carried out, the control unit 33 determines whether the value obtained by subtracting the command power determined by the acquired suppression command from the rated value of the generated power exceeds a predetermined threshold value. It is determined whether or not (step S23).

As a result of the determination, when the value obtained by subtracting the command power from the rated value of the generated power exceeds the threshold (step S23; YES), the control unit 33 provides the hot water heater 5 with the command information indicating the content of the acquired suppression command. Transmit (step S24). If demonstrating it concretely, the control part 33 will produce | generate the instruction information which shows that PV suppression was instruct | indicated, the date, etc., and transmits to the water heater 5. FIG. In step S22 to step S24, the control unit 33 functions as the instruction information transmission unit 304.

On the other hand, when the value obtained by subtracting the command power from the rated value of the generated power does not exceed the threshold (step S23; NO), the control unit 33 does not transmit the command information. If the value obtained by subtracting the indicated power from the rated value of the generated power does not exceed the threshold value, the power loss is not relatively large, and it is estimated that the water heater 5 does not need to perform the boiling operation during PV suppression. It is. Thus, the suppression instruction acquisition process illustrated in FIG. 13 ends.

Returning to FIG. 12, when the power conditioner 31 transmits the instruction information in step S24, the hot water supply controller 54 acquires the transmitted instruction information (step S3). In step S 3, the control unit 61 of the hot water supply controller 54 functions as the instruction information acquisition unit 601.

When the instruction information is acquired, the hot water controller 54 executes a boiling plan process according to the acquired instruction information (step S4). In step S 4, the control unit 61 of the hot water supply controller 54 functions as the plan generation unit 602. In FIG. 14, the detail of the boiling plan production | generation process performed in step S4 is shown.

In the boiling plan generation process shown in FIG. 14, the controller 61 of the hot water supply controller 54 learns the amount of hot water the previous day (step S41) and updates the learning DB 610. The amount of hot water is, for example, the amount of boiling and the amount used. And the control part 61 determines the amount of boiling based on the learning result memorize | stored in learning DB610 (step S42).

More specifically, the control unit 61 predicts the amount of hot water to be used on the next day from the amount of boiling and the amount used up to the previous day stored in the learning DB 610. And the control part 61 determines the amount of boiling from the usage-amount of the hot water of the predicted next day, and the amount of the hot water remaining in the hot water storage tank 53. FIG.

When the boiling amount is determined, the control unit 61 determines whether or not PV suppression is performed on the next day based on the instruction information acquired from the power conditioner 31 (step S43).

If the instruction information indicating that the PV suppression is instructed on the next day is not acquired from the power conditioner 31 by a predetermined time (for example, 23:00), the control unit 61 does not perform the PV suppression on the next day. (Step S43; NO). In this case, the control unit 61 generates a nighttime boiling plan as a boiling plan (step S44), and does not generate a daytime boiling plan. In other words, when the PV suppression is not performed on the next day, the control unit 61 generates a plan for boiling all of the determined boiling amount of hot water at night.

On the other hand, when the instruction information indicating that the PV suppression is instructed on the next day is acquired by a predetermined time, the control unit 61 determines that the PV suppression is performed on the next day (step S43; YES). ). In this case, the control part 61 produces | generates a night boiling plan and a daytime boiling plan as a boiling plan (step S45, S46). In other words, the control unit 61 generates a plan for boiling a part of the determined boiling amount of hot water at night and boiling the rest during the daytime PV suppression as a boiling plan. Thus, the boiling plan generation process shown in FIG. 14 ends.

Returning to FIG. 12, when the hot water supply controller 54 generates a boiling plan, it performs boiling at night according to the generated plan (step S5). Specifically, the hot water supply controller 54 boils up the planned amount of hot water at the planned time according to the night boiling plan generated in step S44 or step S45. In step S 5, the control unit 61 of the hot water supply controller 54 functions as the boiling unit 604.

Note that the display control unit 608 displays a message or an image indicating that boiling is being performed on the remote controller 55 while the boiling is being performed at night. When the night boiling is completed, the display control unit 608 displays a message or an image indicating that on the remote controller 55.

Thereafter, when the time at which PV suppression starts is reached, the power conditioner 31 executes output suppression of the generated power (step S6). FIG. 15 shows details of the output suppression process of the power conditioner 31 executed in step S6. The output suppression process starts when the PV suppression start time determined by the suppression instruction acquired from the power server 14 arrives.

When the output suppression process shown in FIG. 15 is started, the control unit 33 of the power conditioner 31 acquires the measured values of the electric powers P1 and P2 acquired by CT1 and CT2 (step S601). And the control part 33 suppresses the output electric power P2 by controlling the phase of the electric power output from the power conditioner 31 based on the measured value of acquired electric power P1, P2 (step S602). In step S601, the control unit 33 functions as the measurement value acquisition unit 301. In step S602, the control unit 33 functions as the power output unit 305. FIG. 16 shows details of the phase control processing executed in step S602.

In the phase control process shown in FIG. 16, the control unit 33 first determines whether or not the current output power P2 is greater than the command power (step S621). For example, when the current output power P2 is not greater than the command power (step S621; NO), as in the case where the current weather is cloudy or rainy and the amount of power generated by sunlight is small in the first place (step S621; NO), the output from the power conditioner 31 There is no need to suppress the power P2. Therefore, the control unit 33 does not suppress output (step S622). In this case, all of the generated power that can be output from the power conditioner 31 is supplied to the house H or the commercial power system 8.

On the other hand, when it determines with the present output electric power P2 from the power conditioner 31 being larger than instruction | indication electric power (step S621; YES), the control part 33 2ndly, whether the present electric power purchase power P1 is positive, That is, it is determined whether or not power is purchased from the commercial power system 8 (step S623).

If it is determined that the power has not been purchased (step S623; NO), the control unit 33 suppresses the output power P2 in the output suppression mode (step S624). The output suppression mode is a mode for suppressing the output power P2 from the power conditioner 31 up to the limit value instructed by the suppression instruction. In this case, for example, as in the period T2 shown in FIG. 7, the total power consumption Pc of the house H is smaller than the limit value, which corresponds to the case where surplus power is generated.

If it is determined that power is being purchased (step S623; YES), the control unit 33 suppresses the output power P2 in the reverse power flow zero mode (step S625). The reverse power flow zero mode is a mode in which the output power P2 is adjusted so that the reverse power flow approaches zero as much as possible. This case corresponds to a case where the total power consumption Pc of the house H is larger than the command power, for example, during a period T3 shown in FIG. In this case, the control unit 33 adjusts the output power P2 to be equal to the total power consumption Pc. Thereby, the purchased power (reverse power) P1 becomes zero as much as possible, and neither power purchase nor power sale occurs.

After executing the processing of steps S622, S624, and S625, the control unit 33 updates the measurement DB 310 (step S626). For example, when the output is suppressed in the output suppression mode or the reverse power flow zero mode, the control unit 33 updates the measurement DB 310 with the measured values of the power P1, P2 after the output suppression and the data of the phase angle. Thus, the phase control process shown in FIG. 16 ends.

Returning to FIG. 15, when the power output from the power conditioner 31 is suppressed by controlling the phase of the power, the control unit 33 determines whether the total time has elapsed since the start of PV suppression or the previous calculation of surplus power It is determined whether or not (step S603). The total time is a time for calculating the surplus power, and is set to 3 minutes or 5 minutes, for example.

If the counting time has not elapsed (step S603; NO), the control unit 33 returns the process to step S601. Until the total time elapses, the control unit 33 acquires the measured values of the powers P1 and P2 and repeats the process of suppressing the output power P2.

When the total time has elapsed (step S603; YES), the control unit 33 proceeds to a calculation process of surplus power. Specifically, the control unit 33 calculates an average value of the phase angles before the output suppression (step S604). Specifically, the control unit 33 refers to the phase angle data stored in the measurement DB 310 and determines a predetermined period (for example, 5 minutes or 10 minutes) immediately before the PV suppression execution period is started. ) To calculate the average phase angle.

When calculating the average value of the phase angles before output suppression, the control unit 33 calculates the generated power based on the calculation result (step S605). Specifically, the control unit 33 calculates the power factor of the output power P2 by calculating the cosine of the average value of the phase angles, and multiplies the rated value of the generated power Pa by the obtained power factor. Thereby, the control part 33 calculates the estimated value of the generated electric power Pa in the implementation period of PV suppression.

When calculating the generated power Pa, the control unit 33 calculates the surplus power by subtracting the measured value of the output power P2 from the calculated estimated value of the generated power Pa (step S606). Thereby, the control part 33 estimates the electric power which is not output from the power conditioner 31, although the apparatus in the house H containing the water heater 5 can be consumed in the implementation period of PV suppression. In steps S 603 to S 606, the control unit 33 functions as a surplus power calculation unit 306.

When calculating the surplus power, the control unit 33 determines whether or not the specified period has elapsed (step S607). The specified period is a time set to determine the transmission timing of the surplus information to the hot water heater 5, and is set to 30 minutes, for example. When the specified period has not elapsed since the immediately preceding transmission timing (step S607; NO), the control unit 33 skips the processes of steps S608 and S609.

When the specified period has elapsed from the immediately preceding transmission timing (step S607; YES), the control unit 33 averages the surplus power calculated from the immediately preceding transmission timing to the present (step S608). And the control part 33 produces | generates the surplus power information which shows the average surplus power, and transmits surplus power information to the water heater 5 (step S609). In step S608 and step S609, the control unit 33 functions as a surplus power information transmission unit 307.

Thereafter, the control unit 33 determines whether or not the output suppression is finished (step S610). When output suppression is not complete | finished (step S610; NO), the control part 33 returns a process to step S601. Until the output suppression is completed, the control unit 33 repeats the processing from step S601 to step S610.

Finally, when the output suppression ends (step S610; YES), the control unit 33 notifies the water heater 5 of the cancellation of the output suppression (step S611). Thus, the output suppression process of the power conditioner 31 illustrated in FIG. 15 ends.

In parallel with the output suppression process of the power conditioner 31 in step S6, the hot water supply controller 54 executes a daytime boiling process (step S7). In step S 7, the control unit 61 of the hot water supply controller 54 functions as the boiling unit 604. FIG. 17 shows details of the daytime boiling process of the hot water supply controller 54 executed in step S7. This daytime boiling process starts when the PV suppression start time determined by the instruction information acquired from the power conditioner 31 arrives.

When the daytime boiling process shown in FIG. 17 is started, the control unit 61 of the hot water supply controller 54 acquires the surplus information transmitted from the power conditioner 31 in step S609 (step S701). When the surplus power information is acquired, the control unit 61 determines whether or not the surplus power indicated by the acquired surplus power information is larger than a preset boiling startable power (step S702).

When the surplus power is not larger than the startable power (step S702; NO), the control unit 61 does not start boiling and waits until the next surplus information is acquired in step S701.

On the other hand, when the surplus power is larger than the startable power (step S702; YES), the control unit 61 proceeds to a process of starting boiling. Before starting boiling, the controller 61 determines the boiling capacity based on the surplus power (step S703). More specifically, the control unit 61 calculates an upper limit power obtained by subtracting a predetermined margin value from the surplus power, and determines the boiling capacity at which the power consumption of the water heater 5 is less than the upper limit power and becomes the maximum. .

When the boiling capacity is determined, the controller 61 starts the boiling operation with the determined boiling capacity (step S704). Specifically, the control unit 61 drives the heat pump unit 50 with the determined boiling capacity, and starts supplying hot water to the hot water storage tank 53.

While performing the boiling operation, the control unit 61 determines whether or not the boiling operation is completed (step S705). When the boiling operation is finished (step S705; YES), the control unit 61 displays a message or an image indicating that the daytime boiling is finished on the remote controller 55, and finishes the daytime boiling process.

On the other hand, when the boiling operation has not ended (step S705; NO), the control unit 61 determines whether new surplus information has been acquired from the power conditioner 31 (step S706). . When new remaining power information is not acquired (step S706; NO), the control part 61 returns a process to step S704, and continues the boiling operation in execution.

On the other hand, when new surplus information is acquired from the power conditioner 31 (step S706; YES), the control unit 61 changes the boiling capacity based on the new surplus power indicated by the new surplus information. It is determined whether or not it is necessary (step S707). More specifically, the controller 61 determines whether or not the boiling capacity can be increased when the surplus power increases. In addition, when the surplus power is reduced, the control unit 61 determines whether it is necessary to lower the boiling capacity. The controller 61 determines that the boiling capacity needs to be lowered when the surplus power becomes smaller than the threshold value described above.

If it is determined that there is no need to change the boiling capacity (step S707; NO), the control unit 61 returns the process to step S704 and continues the boiling operation being performed without changing the boiling capacity. .

On the other hand, if it is determined that the boiling capacity needs to be changed (step S707; YES), the control unit 61 notifies the user to that effect (step S708). More specifically, when it is determined that the boiling capacity can be increased, the control unit 61 notifies the user that there is sufficient power that can be consumed by the water heater 5, as shown in FIG. , Prompt the user to increase the boiling ability. When it is determined that it is necessary to lower the boiling capacity, the control unit 61 notifies the user that power purchase has occurred and urges the user to lower the boiling capacity as shown in FIG. . In step S708, the control unit 61 functions as the display control unit 608.

When the notification to the user is executed, the control unit 61 determines whether or not an operation for changing the boiling capacity has been received from the user (step S709). When an operation for changing the boiling capacity is not received (step S709; NO), the control unit 61 waits until an operation for changing the boiling capacity is received in step S709. In step S709, the control unit 61 functions as the operation reception unit 609.

When an operation for changing the boiling capacity is received (step S709; YES), the control unit 61 changes the boiling capacity according to the received operation (step S710). And the control part 61 returns a process to step S704, and performs a boiling operation by the boiling capability after a change. In this way, the control unit 61 performs the boiling operation until boiling of the amount of hot water determined in the daytime boiling plan is completed. The daytime boiling process of the hot water supply controller 54 shown in FIG.

Note that the controller 61 is not limited to changing the boiling capacity when an operation for changing the boiling capacity is received from the user, but also when the operation for changing the boiling capacity is not received, In response to this, the boiling capacity may be changed spontaneously.

As described above, according to the hot water supply system 1 according to the first embodiment, the power conditioner 31 generates the power P1 generated by the PV panel 30 and the power output from the power conditioner 31 during the PV suppression period. The difference from P2 is calculated as the surplus power of the power generation facility 3, and the water heater 5 boils hot water with the capacity corresponding to the surplus power. As a result, it is possible to reduce the power generation loss that occurs during PV suppression, and to improve the power utilization efficiency.

In particular, since the power conditioner 31 calculates surplus power and the power conditioner 31 transmits surplus information to the water heater 5, it is necessary to have a configuration of a control device or server other than the power conditioner 31 and the water heater 5. Absent. Therefore, the remaining power can be efficiently utilized with the minimum configuration of the power conditioner 31 and the water heater 5.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described.

In the first embodiment, the power conditioner 31 has a function of calculating the surplus power. In contrast, in the second embodiment, the power conditioner 31 does not have a function of calculating the surplus power, the server connected via the wide area network N calculates the surplus power, and the hot water supply controller 54 receives the surplus power from the server. Get information.

FIG. 18 shows a functional configuration of the hot water supply system 1a according to the second embodiment. The hot water supply system 1a includes a power conditioner 31a, a hot water supply controller 54, and a server 80.

As shown in FIG. 18, the power conditioner 31a functionally includes a measurement value acquisition unit 301, an instruction acquisition unit 303, an instruction information transmission unit 304, a power output unit 305, an output information transmission unit 308, A display control unit 309. Since functions other than the output information transmission unit 308 are the same as those in the first embodiment, description thereof is omitted.

The output information transmission unit 308 transmits first output information indicating the power P2 output by the power output unit 305 to the server 80 via the wide area network N during the PV suppression implementation period. The output information transmission unit 308 is realized by the control unit 33 cooperating with the communication unit 37.

The server 80 is a server that operates in cooperation with the power conditioner 31a and the hot water supply controller 54, and is a server that provides resources in, for example, cloud computing. The server 80 is communicably connected to the power conditioner 31a and the hot water supply controller 54 via the wide area network N. The server 80 may be the power server 14 or a server different from the power server 14. The server 80 includes a CPU, a ROM, a RAM, a communication interface, a readable / writable nonvolatile semiconductor memory, and the like, although not shown.

As shown in FIG. 18, the server 80 functionally includes a first output information acquisition unit 801, a second output information acquisition unit 802, a surplus power calculation unit 803, and a surplus power information transmission unit 804. Each of these functions is realized by software, firmware, or a combination of software and firmware. Software and firmware are described as programs and stored in a ROM or a storage unit. And in a control part, CPU implement | achieves the function of each part by executing the program memorize | stored in ROM or the memory | storage part.

When the first output information is transmitted from the power conditioner 31a via the wide area network N, the first output information acquisition unit 801 acquires the transmitted first output information.

The 2nd output information acquisition part 802 acquires the 2nd output information which shows the electric power output in the implementation period of PV suppression from the power conditioner 31b of the power generation equipment which is not the object of suppression instructions. The power generation equipment that is not the target of the suppression instruction is a power generation equipment that is connected to the server 80 via the wide area network N and is installed in a demand area other than the house H, and the power generation equipment 3 installed in the house H outputs This is a power generation facility that does not suppress output during the period of suppression. The 2nd output information acquisition part 802 is the 1st which shows the electric power output in the implementation period of PV suppression from the power conditioner of the several power generation equipment which is not the object of suppression instructions, for example in the neighborhood area of house H, or a similar location environment. 2 Output information is acquired.

The surplus power calculation unit 803 is based on the first output information acquired by the first output information acquisition unit 801 and the second output information acquired by the second output information acquisition unit 802, and the surplus power of the power conditioner 31a. Calculate

Specifically, the surplus power calculation unit 803 calculates the ratio of the output power from the power conditioner of the power generation facility whose output is not suppressed, which is indicated by the second output information, to the rated value of this power generation facility. The surplus power calculation unit 803 averages this ratio for a plurality of power generation facilities whose outputs are not suppressed. The surplus power calculation unit 803 multiplies the averaged ratio and a predetermined correction coefficient by the rated value of the power generation facility 3 that suppresses the output, thereby generating output power Pa that can be output from the power generation facility 3. Calculate the estimate of. Further, the surplus power calculation unit 803 subtracts the output power P2 of the power conditioner 31a, which is indicated by the first output power, from which the output is suppressed, from the estimated value of the calculated generated power Pa, so that the power conditioner 31a Calculate surplus power.

The surplus power information transmission unit 804 transmits surplus power information indicating the surplus power calculated by the surplus power calculation unit 803 to the water heater 5 via the wide area network N.

In the hot water supply controller 54, when the surplus information is transmitted from the server 80 via the wide area network N, the surplus information acquisition unit 605 acquires the transmitted surplus information. The boiling unit 604 performs day-time boiling in the same manner as in the first embodiment, according to the surplus power acquired by the surplus power information acquisition unit 605. In addition, since the functional structure of the hot water supply controller 54 is the same as that of Embodiment 1, illustration is abbreviate | omitted.

As described above, according to the hot water supply system 1a according to the second embodiment, the server 80 has the remaining power of the power conditioner 31a whose output is suppressed based on the output power from the other power conditioner whose output is not suppressed. Calculate Then, the hot water supply controller 54 acquires remaining power information from the server 80. Since the power conditioner 31a does not have a function of calculating the surplus power, the configuration of the power conditioner 31a can be simplified.

(Modification)
As mentioned above, although embodiment of this invention was described, when implementing this invention, a deformation | transformation and application with a various form are possible.

For example, in the above-described embodiment, the surplus power calculation unit 306 calculates the difference between the generated power Pa and the output power P2 during the PV suppression period, that is, the loss power itself in the power generation facility 3 as the surplus power. However, in the present invention, as long as the power is based on the difference between the generated power Pa and the output power P2 during the PV suppression period, it may be defined by another method. For example, in order to secure a margin, the surplus power can be determined as power obtained by subtracting a predetermined margin value from the difference (loss power) between the generated power Pa and the output power P2 during the PV suppression period.

Alternatively, the surplus power calculation unit 306 may calculate the power obtained by adding the reverse power to the difference (loss power) between the generated power Pa and the output power P2 during the PV suppression implementation period as the surplus power. For example, when the output is suppressed while generating a reverse power flow as in the “output suppression mode” in the period T2 shown in FIG. 7, both the loss power and the reverse power are present. In such a case, not only the power loss in the power generation equipment 3 but also the reverse power can be used for the boiling operation of the water heater 5. More specifically, the surplus power calculation unit 306 calculates the reverse tide power acquired by the measurement value acquisition unit 301 in the difference between the power Pa generated by the PV panel 30 and the power P2 output by the power output unit 305. The surplus power may be calculated by adding the measured value of (−P1). As described above, the surplus power calculation unit 306 calculates the surplus power including the reverse power, and the surplus power information transmission unit 307 transmits the surplus information indicating the surplus power to the water heater 5, so that more power can be obtained. It can be used for boiling operation of the water heater 5. This is more effective particularly when the economic effect of power sales is not important.

In the above embodiment, the power output unit 305 of the power conditioner 31 selects the output suppression mode or the reverse power flow zero mode according to the measured value of the purchased power (reverse power) P1, and outputs in the selected mode. Power was suppressed. However, in the present invention, the power output unit 305 may suppress the output power by another method as long as it can be controlled so that the reverse power does not exceed the instruction power determined by the suppression instruction. For example, the power output unit 305 increases the output power if the reverse power is smaller than the command power, and decreases the output power if the reverse power is larger than the command power, so that the reverse power is equal to the command power. The output power may be controlled so that it is maintained.

Moreover, in the said embodiment, the capability according to the surplus power was demonstrated as the boiling capability which can be set in the range where the increase amount of the power consumption in the hot water heater 5 is smaller than the surplus power so that no power purchase occurs. The ability according to the surplus power may be determined by other methods. For example, when it is allowed to generate a certain amount of power, the capacity corresponding to the remaining power can be set so that the amount of increase in power consumption in the water heater 5 is larger than the remaining power.

Further, in the above embodiment, the boiling unit 604 of the hot water supply controller 54 reduces the power consumption of the hot water heater 5 when the remaining power becomes smaller than the threshold value while boiling the hot water. At this time, the boiling unit 604 may change the threshold according to the electric power P1 purchased from the commercial power system 8. For example, the boiling unit 604 can increase the threshold value as the purchased power P1 is larger, and decrease the threshold value as the purchased power P1 is smaller. Thereby, since the power consumption by the boiling operation of the water heater 5 is adjusted in accordance with the amount of the purchased power P1, it is possible to suppress power purchase more accurately. At this time, the hot water supply controller 54 may acquire the measured value of the purchased power P1 from the power conditioner 31 or may measure the purchased power P1 by itself.

Further, in the above embodiment, the power generation equipment 3 is installed in the house H. However, if the power generation facility 3 is a power system different from the commercial power system 8, the power generation facility 3 may be installed on a site separate from the house H and supply power to the house H from a remote location. In this case, it is called a demand area including the place where the power generation equipment 3 is installed. Further, the demand area is not limited to a general house such as the house H described above, but is an apartment house, a facility, a building, or a factory as long as it is a demand place of power from the power generation equipment 3 and the commercial power system 8. Etc.

In the above embodiment, in the control unit 33 of the power conditioner 31, the CPU executes a program stored in the ROM or the storage unit 36, whereby the measurement value acquisition unit 301, the instruction acquisition unit 303, the instruction information transmission unit 304, The power output unit 305, the surplus power calculation unit 306, the surplus power information transmission unit 307, and the display control unit 309 functioned. Further, in the control unit 61 of the hot water supply controller 54, the CPU executes a program stored in the ROM or the storage unit 62, whereby the instruction information acquisition unit 601, the plan generation unit 602, the remaining power information acquisition unit 605, and the boiling unit 604. And the display control unit 608. However, in the present invention, the control unit 33 and the control unit 61 may be dedicated hardware. The dedicated hardware is, for example, a single circuit, a composite circuit, a programmed processor, an ASIC (Application Specific Integrated 、 Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. When the control unit 33 and the control unit 61 are dedicated hardware, the functions of the respective units may be realized by individual hardware, or the functions of the respective units may be collectively realized by a single hardware. .

Also, some of the functions of each unit may be realized by dedicated hardware, and the other part may be realized by software or firmware. As described above, the control unit 33 and the control unit 61 can realize the functions described above by hardware, software, firmware, or a combination thereof.

By applying the operation program that defines the operation of the power conditioner 31, the hot water supply controller 54, and the server 80 according to the present invention to an existing personal computer or information terminal device, the personal computer or information terminal device, etc. It is also possible to function as the power conditioner 31, the hot water supply controller 54, and the server 80 according to the above.

Further, such a program distribution method is arbitrary. For example, a computer-readable record such as a CD-ROM (Compact Disk ROM), a DVD (Digital Versatile Disk), an MO (Magneto Optical Disk), or a memory card. It may be distributed by being stored in a medium or distributed via a communication network such as the Internet.

The present invention is capable of various embodiments and modifications without departing from the broad spirit and scope of the present invention. The above-described embodiments are for explaining the present invention and do not limit the scope of the present invention. In other words, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications made within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

The present invention can be suitably employed in a system for managing power.

1, 1a hot water supply system, 3 power generation equipment, 5 hot water heater, 7 (7-1, 7-2, ...) equipment, 8 commercial power system, 9 distribution board, 12 router, 14 power server, 30 PV panel, 31 , 31a, 31b, power conditioner, 32 inverter, 33, 61 control unit, 34 generated power calculation unit, 35 state management unit, 36, 62 storage unit, 37, 64 communication unit, 38 communication adapter, 40 display unit, 50 heat pump Unit, 51 tank unit, 52 piping, 53 hot water storage tank, 54 hot water supply controller, 55 remote control, 56 mixing valve, 57 shower, 58 faucet, 59 communication line, 63 timekeeping section, 69 bus, 80 server, 301 measurement value acquisition section, 303 instruction acquisition unit, 304 instruction information transmission unit, 305 power output unit, 306 803 surplus power calculation unit, 307,804 surplus information transmission unit, 308 output information transmission unit, 309, 608 display control unit, 310 measurement DB, 320 instruction DB, 601 instruction information acquisition unit, 602 plan generation unit, 604 boiling unit , 605 surplus information acquisition unit, 609 operation reception unit, 610 learning DB, 801 first output information acquisition unit, 802 second output information acquisition unit, D1 to D5 power line, H house, N wide area network

Claims

A hot water supply system including a power conditioner and a water heater,
The inverter is
Instruction acquisition means for acquiring an instruction to suppress supply of the power generated by the power generation means to the commercial power system;
A power output means for outputting less power than the generated power out of the power generated by the power generation means in a period determined by the instruction when the instruction acquisition means acquires the instruction; ,
The water heater is
Surplus power information acquisition means for acquiring surplus power information indicating surplus power based on a difference between the power generated by the power generation means and the power output by the power output means in the period;
When the surplus power information acquisition means acquires the surplus power information, it comprises boiling means for boiling hot water with the capacity according to the surplus power.
Hot water system.
The inverter is
Surplus power calculating means for calculating the surplus power;
Surplus power information transmitting means for transmitting the surplus power information indicating the surplus power calculated by the surplus power calculating means to the water heater;
In the water heater,
The surplus power information acquisition unit acquires the surplus power information transmitted from the power conditioner.
The hot water supply system according to claim 1.
In the inverter,
The surplus power calculation means is generated by the power generation means in the period by multiplying a power factor of power output by the power output means before the period by a rated value of power generated by the power generation means. Calculating power, and calculating the remaining power by subtracting the power output by the power output means in the period from the calculated power;
The hot water supply system according to claim 2.
The inverter is
A measurement value acquisition means for acquiring a measurement value of the power supplied to the commercial power grid of the power generated by the power generation means;
The surplus power calculation means adds the measurement value of the power acquired by the measurement value acquisition means to the difference between the power generated by the power generation means and the power output by the power output means, thereby Calculating the surplus power,
The hot water supply system according to claim 2 or 3.
The hot water supply system further includes a server,
The inverter is
Output information transmitting means for transmitting, to the server, first output information indicating the power output by the power output means in the period;
The server
First output information acquisition means for acquiring the first output information transmitted from the inverter;
Second output information acquisition means for acquiring second output information indicating the power output in the period from the power generation equipment that is not the target of the instruction;
Surplus power calculating means for calculating the surplus power based on the first output information acquired by the first output information acquiring means and the second output information acquired by the second output information acquiring means;
Surplus power information transmitting means for transmitting the surplus power information indicating the surplus power calculated by the surplus power calculating means to the water heater,
In the water heater,
The surplus information acquisition means acquires the surplus information transmitted from the server.
The hot water supply system according to claim 1.
In the water heater,
The boiling means, when the remaining power information acquisition means acquires the remaining power information, increases the power consumption in the water heater by an amount smaller than the remaining power, to boil the hot water,
The hot water supply system according to any one of claims 1 to 5.
In the water heater,
The boiling means reduces the power consumption of the water heater when the remaining power becomes smaller than a threshold value during boiling the hot water,
The hot water supply system according to any one of claims 1 to 6.
The water heater is
The boiling means changes the threshold according to the electric power purchased from the commercial power system.
The hot water supply system according to claim 7.
The inverter is
When the instruction acquisition means acquires the instruction, the instruction acquisition means further includes instruction information transmission means for transmitting instruction information indicating the content of the instruction acquired by the instruction acquisition means to the water heater,
The water heater is
Instruction information acquisition means for acquiring the instruction information transmitted from the inverter, further comprising:
When the instruction information acquisition means acquires the instruction information, the boiling means boils a first amount of hot water before the period, and in the period, the second power with the capacity according to the surplus power Boil a quantity of hot water,
The hot water supply system according to any one of claims 1 to 8.
Obtain an instruction to suppress the supply of power generated by the power generation means to the commercial power system,
When acquiring the instruction, in a period determined by the instruction, of the electric power generated by the power generation means, to suppress the power output from the power conditioner,
Boiling hot water with a water heater, with the capability according to the difference between the power generated by the power generation means and the power output from the power conditioner in the period,
Control method for water heater.