JP6161646B2 - Control device, control system, control method, and program - Google Patents

Description

  The present invention relates to a control device, a control system, a control method, and a program.

  2. Description of the Related Art Storage batteries that store electric power purchased from an electric power system or electric power generated by solar power generation or the like in a storage battery and supply electric power to an electrical device in a house when necessary are known. When such a storage battery is used, for example, power generated excessively by solar power generation can be stored, and the stored power can be used at night. Moreover, if the stored electric power is used during the daytime when the electric power demand increases, it can contribute to the mitigation of electric power demand.

  Usually, AC power is supplied from the power system, and AC power is supplied to load equipment in the house. On the other hand, DC power is used for charging and discharging the storage battery. For this reason, a power conditioner that performs power conversion from direct current to alternating current and power conversion from alternating current to direct current is required. However, when power conversion is performed by the power conditioner, a part of the power is lost as heat. That is, the power output from the power conditioner is smaller than the input power.

  Generally, a power conditioner is designed so that the efficiency of power conversion is maximized at its rated power. For this reason, when the input / output of the power conditioner is small, the efficiency of power conversion deteriorates and the loss power increases. In view of this, a technique for suppressing power conversion loss by charging and discharging a storage battery only when the input / output of the power conditioner is large has been proposed (see, for example, Patent Document 1).

  The device described in Patent Literature 1 predicts the heat demand of a heat pump water heater, and discharges the storage battery when the amount of electricity stored in the storage battery is greater than the amount of power consumed by the heat pump water heater required for the heat demand. This device also discharges the storage battery even when the load power due to a load other than the heat pump water heater is larger than the power consumption during operation of the heat pump water heater. Thereby, a storage battery can be discharged in the time slot | zone with a large discharge amount. As a result, the power loss of a DC / AC converter or the like can be reduced.

JP 2012-244780 A

  However, the apparatus described in Patent Literature 1 does not discharge the storage battery when the heat pump water heater is not used and the state of low power consumption is maintained. In this case, power conversion with large power loss is not executed, but it cannot be said that the storage battery is utilized, which is not preferable.

  The present invention has been made under the above circumstances, and an object thereof is to utilize a storage battery while suppressing power loss.

In order to achieve the above object, the control device of the present invention is supplied from a storage battery via an acquisition means for acquiring a measured value of discharge power output from the storage battery by discharge and a conversion means for converting DC power to AC power. A control unit that controls an electrical device that consumes the discharged power so that the measured value of the discharge power acquired by the acquiring unit exceeds the threshold value, and a determination that determines the threshold value from the rate of change of the conversion efficiency of the conversion unit with respect to the discharge power Means .

According to the present invention, the electric device is controlled so that the measured value of the discharge power exceeds the threshold value. Thereby, it becomes possible to adjust the power consumption of an electric equipment and to improve the efficiency of power conversion. Therefore, the storage battery can be utilized while suppressing power loss.

1 is a diagram illustrating a configuration of a control system according to Embodiment 1. FIG. It is a figure which shows the relationship between the output electric power of a power converter, and conversion efficiency. It is a figure which shows the functional structure of a control apparatus. It is a figure which shows the 1st example of the method of prescribing | regulating a threshold value. It is a figure which shows the 2nd example of the method of prescribing | regulating a threshold value. It is a figure which shows the 3rd example of the method of prescribing | regulating a threshold value. It is a flowchart which shows a series of processes performed by the control apparatus. 6 is a diagram illustrating a functional configuration of a control device according to Embodiment 2. FIG. It is a figure which shows the 4th example of the method of prescribing | regulating a threshold value. It is a figure which shows the 5th example of the method of prescribing | regulating a threshold value. It is a figure which shows the 6th example of the method of prescribing | regulating a threshold value. It is a flowchart which shows a series of processes performed by the schedule change part.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a control system 100 according to the present embodiment. The control system 100 is a HEMS (Home Energy Management System) for efficiently using power by monitoring a balance of power in a house and controlling devices. As illustrated in FIG. 1, the control system 100 includes a control device 10 that controls the electrical devices 31, 32, and 33, a measurement device 20 that measures power supplied via a power line, and a plurality of electrical devices 31 to 31. 33, a power storage device 40 that stores electric power, and a power generation device 50 that generates electric power and supplies it to the house. 1 represents a power line, a solid line connected to the measuring device 20 represents a signal line, and a broken line represents a communication line.

  The control device 10 is a computer terminal connected to the measuring device 20, the electric devices 31 to 33, the power conversion unit 41, and a network NW such as the Internet via a communication line, and is installed in a house. In addition, the control device 10 is a HEMS controller that controls the electrical devices 31 to 33 based on the result of measurement by the measurement device 20. The control device 10 includes a processor 11, a main storage unit 12, an auxiliary storage unit 13, an input unit 14, an output unit 15, and a communication interface 16. The main storage unit 12, auxiliary storage unit 13, input unit 14, output unit 15, and communication interface 16 are all connected to the processor 11 via an internal bus 17.

  The processor 11 is composed of, for example, a CPU (Central Processing Unit). The processor 11 executes a process described later by executing the program P1 stored in the auxiliary storage unit 13.

  The main storage unit 12 is composed of, for example, a RAM (Random Access Memory). The main storage unit 12 loads the program P1 from the auxiliary storage unit 13. The main storage unit 12 is used as a work area for the processor 11.

  The auxiliary storage unit 13 includes a nonvolatile memory such as a hard disk or a flash memory. The auxiliary storage unit 13 stores various data used for the processing of the processor 11 in addition to the program P1. The auxiliary storage unit 13 supplies data used by the processor 11 to the processor 11 according to an instruction from the processor 11 and stores the data supplied from the processor 11.

  The input unit 14 includes, for example, an input key and a capacitive pointing device. The input unit 14 acquires information input by the user of the control device 10 and notifies the processor 11 of the acquired information.

  The output unit 15 includes, for example, an LCD (Liquid Crystal Display) and a speaker. The output unit 15 presents various information to the user in accordance with instructions from the processor 11.

  The communication interface 16 includes an interface circuit for communicating with an external device. The communication interface 16 receives a signal from an external device and outputs data included in this signal to the processor 11. Further, the communication interface 16 transmits a signal including data output from the processor 11 to an external device. In the present embodiment, devices outside the control device 10 mean the measurement device 20, the electric devices 31 to 33, and the power conversion unit 41 of the power storage device 40. The communication interface 16 is connected to the network NW.

  The measuring device 20 measures the power consumption of each of the electrical devices 31 to 33 and the power input to and output from the power conversion unit 41, for example, every minute using current sensors (CT) 21 to 25. Then, the measuring device 20 repeatedly notifies the control device 10 of the measured power value obtained as a result of the measurement.

  For example, the current sensor 21 detects a current flowing through the power supply path to the electrical device 31 and outputs a signal corresponding to the detected current to the measuring device 20. The measuring device 20 obtains a measured value of the power consumption of the electric device 31 based on the signal from the current sensor 21. Further, the current sensor 22 detects a current flowing through the power supply path to the electric device 32, and the measuring device 20 calculates a measured value of the power consumption of the electric device 32 based on the detection result notified from the current sensor 22. obtain. Further, the current sensor 23 detects a current flowing through the power supply path to the electric device 33, and the measuring device 20 calculates a measured value of the power consumption of the electric device 33 based on the detection result notified from the current sensor 23. obtain.

  Further, the current sensor 24 is disposed on a power line connected to the power conversion unit 41. Then, the current sensor 24 detects the AC power current and outputs a signal corresponding to the detected current to the measuring device 20. The measuring device 20 obtains a measured value of charging power (alternating current power) input to the power conversion unit 41 or discharging power (alternating current power) output from the power conversion unit 41 based on a signal from the current sensor 24. .

  Current sensor 25 is disposed on a power line connecting power conversion unit 41 and storage battery 42 in power storage device 40. Then, the current sensor 25 detects the direct current power and outputs a signal corresponding to the detected current to the measuring device 20. The measuring device 20 obtains a measured value of charging power (DC power) output from the power conversion unit 41 or discharging power (DC power) input to the power conversion unit 41 based on a signal from the current sensor 25. .

  In addition, the current sensors 21-23 are arrange | positioned at the switchboard in a house, for example. Moreover, the current sensors 24 and 25 are disposed in the power storage device 40, for example.

  Each of the electric devices 31 to 33 is a home electric appliance installed in a house, for example, an audio / video device such as a television receiver, an air conditioner (air conditioner), an electric water heater, a refrigerator, or electromagnetic cooking It is a vessel. Each of the electric devices 31 to 33 changes its operating state in accordance with a control command transmitted from the control device 10. The operating state of each of the electric devices 31 to 33 may be simply operating or stopping, or may be defined using various parameters.

  For example, when the electric device 31 is an air conditioner and is instructed by a control command from the control device 10 so as to return from the standby state and start the cooling operation, the electric device 31 performs the cooling operation according to this instruction. Start. The operation state of the electric device 31 is “cooling operation”. Furthermore, when the control device 10 instructs the electric device 31 to set the set temperature to 26 ° C., the electric device 31 starts a cooling operation for setting the temperature of the air-conditioned space to 26 ° C. The operation state of the electrical device 31 is “cooling operation at a set temperature of 26 ° C.”.

  Moreover, each of the electric devices 31 to 33 operates with power consumption corresponding to the operation state. In the present embodiment, the electric power consumed by each of electric devices 31 to 33 is supplied from commercial power supply PS, power storage device 40 or power generation device 50.

  The power storage device 40 is a stationary device that stores the power supplied from the commercial power source PS and the power generated by the power generation device 50. The electric power stored by the power storage device 40 is supplied to the electric devices 31 to 33. The power storage device 40 includes a power conversion unit 41 that performs power conversion and the like, and a storage battery 42 that stores power.

  The power converter 41 includes, for example, a transformer that converts the voltage of DC power, a converter that converts DC power and AC power, a control circuit that controls the transformer and the converter, and the like. It is a power conditioner. The power conversion unit 41 charges the storage battery 42 by converting the AC power supplied from the commercial power source PS and the power generation device 50 into DC power having a voltage suitable for charging the storage battery 42 and outputting the DC power to the storage battery 42. . In addition, the power conversion unit 41 converts the DC power supplied by the discharge of the storage battery 42 into AC power having a voltage used in the house, and supplies the AC power to the electrical devices 31 to 33.

  FIG. 2 shows the relationship between the output power output from the power conversion unit 41 and the power conversion efficiency of the power conversion unit 41. The horizontal axis in FIG. 2 indicates the value of DC power (charging power) or AC power (discharging power) output from the power conversion unit 41. Further, the conversion efficiency shown on the vertical axis means the ratio between the output and the input of the power conversion unit 41. As shown in FIG. 2, the conversion efficiency increases as the output power increases. In addition, the electric power Pr in FIG. 2 means the rated electric power of the electric power conversion part 41, for example, is 6 kW. The graph of FIG. 2 shows the relationship between the output power and the conversion efficiency. This relationship substantially shows the relationship between the output power and the loss power when the power conversion unit 41 converts the power. ing.

  Moreover, the power converter 41 has a switching element for converting power. If this switching element is in the ON state, the power conversion unit 41 converts power. When the power conversion unit 41 converts power, the storage battery 42 is charged and discharged. On the other hand, if the switching element is in the OFF state, the power conversion unit 41 does not convert power. When the power conversion unit 41 does not convert power, charging / discharging of the storage battery 42 is not executed. The control circuit of the power conversion unit 41 switches the state of the switching element in accordance with a control command from the control device 10.

  The power conversion unit 41 links the generated power from the power generation device 50 with the charge / discharge power of the storage battery 42. For example, when the generated power is larger than the power consumption of the electrical devices 31 to 33, the power conversion unit 41 allocates surplus power obtained by subtracting the power consumption from the generated power to charge or sell the storage battery 42. That is, the power conversion unit 41 distributes the generated power to the power consumption of the electrical devices 31 to 33, the charging power, and the power selling power. Further, when the generated power is smaller than the power consumption of the electric devices 31 to 33, the power conversion unit 41 covers the insufficient power obtained by subtracting the generated power from the power consumption by discharging the storage battery 42. That is, the power conversion unit 41 supplies the generated power and the discharged power to the electrical devices 31 to 33 together. However, when the remaining amount of the storage battery 42 is insufficient, the electric power from the commercial power source PS is supplied to the electric devices 31 to 33.

  Further, the power conversion unit 41 manages the remaining amount of the storage battery 42 based on the history of charge / discharge power or the voltage fluctuation of the storage battery 42. The power conversion unit 41 stops charging the storage battery 42 when the remaining amount of the storage battery 42 is 100%, and stops discharging the storage battery 42 when the remaining amount of the storage battery 42 is 0%. In response to the request from the control device 10, the power conversion unit 41 notifies the control device 10 of the current remaining amount of the storage battery 42.

  The storage battery 42 is a secondary battery such as a nickel-cadmium battery, a nickel metal hydride battery, a lithium ion battery, or a lead storage battery. The capacity of the storage battery 42 is 5.0 kWh, for example.

  In addition, in this Embodiment, although the power converter 41 and the storage battery 42 comprised the stationary power storage device, the power converter 41 and the storage battery 42 do not need to be comprised integrally. For example, the storage battery 42 is a battery mounted on an electric vehicle, and the power conversion unit 41 is a stationary device that is connected to the electric vehicle via a power line when the electric vehicle is parked in a garage. There may be.

  The power generation device 50 is a device that generates power using, for example, sunlight, and is installed on the roof of a house. The power generation device 50 includes, for example, a polycrystalline silicon solar panel and a power conditioner that converts DC power generated by the solar panel into AC power. The power generation device 50 may generate power using natural energy other than sunlight, or may generate power using fossil fuel. Furthermore, the power generation device 50 may be a fuel cell.

  The control device 10 exhibits various functions by having the above-described configuration. FIG. 3 shows a functional configuration of the control device 10. As shown in FIG. 3, the control device 10 acquires information necessary for controlling the electrical devices 31 to 33 and registers the information in the storage unit 102, a storage unit 102 that stores various data, A charge / discharge determination unit 103 that determines whether or not the storage battery 42 can be charged / discharged, a control unit 104 that controls the electric devices 31 to 33 and the power conversion unit 41, and a communication unit 105 that communicates with an external device. Have.

  The information registration unit 101 is realized by the processor 11, the input unit 14, the communication interface 16, and the like. The information registration unit 101 learns the relationship between the conversion efficiency and the output power shown in FIG. 2 from the measurement data D1 stored in the storage unit 102. The measurement data D1 is data indicating a history of measurement results obtained by the measurement device 20. Then, the information registration unit 101 registers efficiency data D <b> 2 indicating the relationship between the learned conversion efficiency and output power in the storage unit 102.

  In addition, the information registration unit 101 acquires device data D3 that associates the operation state of each of the electrical devices 31 to 33 with power consumption, for example, from a server device on the Internet and registers the device data D3 in the storage unit 102. The device data D3 may be data indicating the average power consumption of each of the electrical devices 31 to 33.

  In addition, the information registration unit 101 acquires schedule data D4 of each of the electrical devices 31 to 33 from the user and registers it in the storage unit 102. The schedule data D4 indicates an operation schedule of the electric devices 31 to 33. The schedule data D4 is data for associating, for example, the operating state of the electrical devices 31 to 33 and the date and time of operation in this operating state.

  In addition, the information registration unit 101 acquires the rated value of the output power of the power conversion unit 41 and the capacity of the storage battery 42 by prompting the user to input and registers them in the storage unit 102.

  In addition, the information registration unit 101 acquires a threshold value used in processing to be described later by prompting the user to input. This threshold value is a threshold value of the output power of the power conversion unit 41. 4 to 6 show examples of this threshold value. The threshold value Th1 shown in FIG. 4 is the output power when the slope of the line L1 indicating the relationship between the conversion efficiency and the output power is 15% / kW. In FIG. 4, a line L2 having a slope of 15% / kW is supplementarily shown. The threshold value Th2 shown in FIG. 5 is output power when the conversion efficiency is 75%. The threshold value Th3 shown in FIG. 6 is, for example, 2 kW output power. Note that the information registration unit 101 may acquire this threshold from a server device or external media on the Internet, or may determine the threshold based on the efficiency data D2 or the like. Then, the information registration unit 101 registers the threshold value in the storage unit 102.

  The storage unit 102 is mainly realized by the auxiliary storage unit 13. The storage unit 102 stores measurement data D1, efficiency data D2, device data D3, and schedule data D4. In addition, the storage unit 102 acquires the remaining amount of the storage battery 42 and the current operation state of the electric devices 31 to 33 from the communication unit 105 and stores them. Furthermore, the memory | storage part 102 may acquire the price of the trading power for every time slot | zone, for example from the information registration part 101, and may memorize | store it.

  The charge / discharge determination unit 103 is mainly realized by the processor 11. The charge / discharge determination unit 103 determines whether charge / discharge is possible based on the remaining amount of the storage battery 42. For example, the charge / discharge determination unit 103 determines that the discharge is impossible when the remaining amount of discharge (for example, 0.5 kWh) is not secured in the storage battery 42. In addition to the remaining amount of the storage battery 42, the charge / discharge determination unit 103 may determine whether charging / discharging is possible based on the power generation amount of the power generation device 50 and the capacity of the storage battery 42. The power generation amount of the power generation device 50 can be obtained from the measurement data D1.

  The control unit 104 is mainly realized by the processor 11. The control unit 104 determines the content of control for the electrical devices 31 to 33 based on the determination result by the charge / discharge determination unit 103 and the data stored in the storage unit 102. And the control part 104 produces | generates a control command according to the content of the determined control, and transmits to the apparatus used as a control object via the communication part 105. FIG. For example, when it is determined that the storage battery 42 can be discharged, the control unit 104 increases the power consumption of the electrical devices 31 to 33 so that the output power (discharge power) of the power conversion unit 41 increases. Moreover, the control part 104 reduces the power consumption of the electric equipment 31-33 so that the output power (charging power) of the power converter 41 may increase, when it determines with the charge of the storage battery 42 being possible.

  The communication unit 105 is realized mainly by the cooperation of the processor 11 and the communication interface 16. The communication unit 105 acquires a measurement result from the measurement device 20 and registers it in the storage unit 102 as measurement data D1. In addition, the communication unit 105 acquires the current operation state from each of the electric devices 31 to 33 and registers the acquired operation state in the storage unit 102. In addition, the communication unit 105 acquires the remaining amount of the storage battery 42 from the power conversion unit 41 and registers it in the storage unit 102. Further, the communication unit 105 transmits a control command from the control unit 104 to a device to be controlled.

  Next, a series of processes executed by the control device 10 will be described using the flowchart shown in FIG. The process shown in FIG. 7 starts when the control device 10 is turned on. The process shown in FIG. 7 is mainly executed by the processor 11, but will be described below using the configuration shown in FIG. 3 as appropriate.

  First, the information registration unit 101 acquires information and registers the acquired information in the storage unit 102 (step S1). Next, the communication part 105 acquires data and updates the data memorize | stored in the memory | storage part 102 (step S2). Specifically, the communication unit 105 updates the measurement result of the measurement device 20, the remaining amount of the storage battery 42, and the operation state of the electric devices 31 to 33.

  Next, the charge / discharge determination unit 103 determines whether or not the power generation amount of the power generation device 50 is greater than the total power consumption of the electrical devices 31 to 33 (step S3).

  When it determines with electric power generation amount being larger than total power consumption (step S3; Yes), the charging / discharging determination part 103 calculates the surplus electric power remove | excluding total power consumption from generated power (step S4).

  Next, the charge / discharge determination unit 103 determines whether or not the storage battery 42 can be charged based on the remaining amount of the storage battery 42 (step S5). This determination may be made based on the remaining amount of the storage battery 42 and the capacity of the storage battery 42. For example, when the ratio of the remaining amount with respect to the capacity of the storage battery 42 falls below a certain value, the charge / discharge determination unit 103 may determine that charging is possible.

  When it is determined that charging is not possible (step S5; No), the processor 11 executes surplus power processing (step S6). In surplus power processing, for example, surplus power is reversely flowed (sold) into the commercial power supply PS system. In surplus power processing, the control unit 104 may add a device to be used or turn off the power supply of the power generation device 50. The addition of the devices to be used is, for example, to change the operation schedule indicated by the schedule data D4 so that the devices that are not currently operating but are scheduled to operate in the future are operated from the present time. Thereafter, the processing by the processor 11 returns to step S2.

  On the other hand, when it is determined that charging is possible (step S5; Yes), the control unit 104 causes the power conversion unit 41 to start charging the storage battery 42 (step S7). Next, the control unit 104 determines whether or not the measured value of charging power satisfies a predetermined condition (step S8). This condition is satisfied, for example, when the measured value of the charging power exceeds the threshold value shown in FIGS.

  When it determines with the measured value of charging power not satisfy | filling conditions (step S8; No), the control part 104 controls the electric equipment 31-33 (step S9). Specifically, the control unit 104 controls the electric devices 31 to 33 by changing the operation schedule based on the device data D3, and reduces the total power consumption of the electric devices 31 to 33. As a result, the charging power allocated from the generated power increases. For example, the control part 104 postpones an operation schedule in an order from an apparatus with a low priority among the electric apparatuses 31-33 currently operate | moving according to an operation schedule. This priority may be specified in advance by the user, or may be determined according to the frequency of use of the electrical devices 31 to 33.

  Then, the control part 104 repeats the process after step S8. Thereby, control of the electric equipment 31-33 is repeated until charge electric power satisfy | fills conditions.

  If it is determined in step S8 that the measured value of the charging power satisfies the condition (step S8; Yes), the processing by the processor 11 returns to step S2.

  When it is determined in step S3 that the power generation amount is equal to or less than the total power consumption (step S3; No), the charge / discharge determination unit 103 calculates the insufficient power obtained by subtracting the generated power from the total power consumption (step S10). .

  Next, the charge / discharge determination unit 103 determines whether or not the storage battery 42 can be discharged based on the remaining amount of the storage battery 42 (step S11). This determination may be made based on the remaining amount of the storage battery 42 and the calculated insufficient power. For example, the charging / discharging determination unit 103 may determine that discharging is impossible when there is not enough remaining power to discharge for a certain time (for example, 5 minutes) with insufficient power.

  When it is determined that the discharge is not possible (step S11; No), the processor 11 executes an insufficient power process (step S12). In the shortage power process, for example, power corresponding to the shortage power is purchased from a commercial power source. In the shortage power process, the control unit 104 may reduce the number of devices used. The reduction of the equipment used is, for example, to postpone the operation schedule. Thereafter, the processing by the processor 11 returns to step S2.

  On the other hand, when it determines with discharge being possible (step S11; Yes), the control part 104 makes the power converter 41 start discharge of the storage battery 42 (step S13). Next, the control unit 104 determines whether or not the measured value of the discharge power satisfies a predetermined condition (step S14). This condition is satisfied, for example, when the measured value of the discharge power exceeds the threshold value shown in FIGS.

  When it determines with the measured value of discharge power not satisfy | filling conditions (step S14; No), the control part 104 controls the electric equipment 31-33 (step S15). Specifically, the control unit 104 controls the electric devices 31 to 33 by changing the operation schedule based on the device data D3, and increases the total power consumption of the electric devices 31 to 33. As a result, the discharge power increases. For example, the control unit 104 operates the electrical devices 31 to 33 as simultaneously as possible. Moreover, the control part 104 may extend the driving | running time of the future driving | running schedule of the electric equipment 31-33, and may start a driving | operation from now.

  Then, the control part 104 repeats the process after step S14. Thereby, control of the electric equipment 31-33 is repeated until discharge electric power satisfy | fills conditions.

  If it is determined in step S14 that the measured value of the discharge power satisfies the condition (step S14; Yes), the processing by the processor 11 returns to step S2.

  As described above, in this embodiment, when it is determined that discharge is possible, discharge is started. And the electric equipments 31-33 are controlled so that the measured value of discharge power exceeds a threshold value. When it is determined that charging is possible, charging is started. And the electric equipments 31-33 are controlled so that the measured value of charging power exceeds a threshold value. Thereby, it becomes possible to adjust the power consumption of an electric equipment and to improve the efficiency of power conversion. Therefore, the storage battery can be utilized while suppressing power loss.

  Moreover, the control part 104 controlled the electric equipment 31-33 by changing a driving schedule. Thereby, it is possible to suppress power loss by simply shifting the operation schedule back and forth without adding extra operations of the electric devices 31 to 33 or canceling the necessary operations.

Embodiment 2. FIG.
Next, Embodiment 2 of the present invention will be described with reference to the drawings. In addition, about the structure same or equivalent to Embodiment 1, while using an equivalent code | symbol, the description is abbreviate | omitted or simplified.

  The control device 10 according to the present embodiment is different from that according to the first embodiment in that the transition of the charge / discharge power is predicted and the operation schedule is changed so that future power loss can be suppressed.

  FIG. 8 shows a functional configuration of the control device 10 according to the present embodiment. As illustrated in FIG. 8, the control device 10 includes a prediction unit 106 that predicts the transition of charge / discharge power, and a schedule change unit 107 that changes the operation schedule based on the prediction result of the prediction unit 106. .

  The prediction unit 106 is mainly realized by the processor 11. The prediction unit 106 reads the device data D3 and the schedule data D4 from the storage unit 102, and predicts the transition of the total power consumption of the electrical devices 31 to 33 in the future. Further, the prediction unit 106 reads the measurement data D1 from the storage unit 102, and predicts the transition of power generated by the power generation device 50 in the future. And the prediction part 106 estimates the timing at which charging / discharging of the storage battery 42 is performed based on the predicted value of the total power consumption and the generated power, thereby changing the charge / discharge power and the remaining amount of the storage battery 42. Predict.

  The schedule changing unit 107 is mainly realized by the processor 11. The schedule changing unit 107 changes the operation schedule so that the charge / discharge power in the future satisfies the condition. For example, the schedule change unit 107 changes the operation schedule so that the charge / discharge power satisfies the condition at a time point after 2 hours.

  In addition, the information registration unit 101 according to the present embodiment registers two threshold values in the storage unit 102. One threshold value is equal to the threshold value according to the first embodiment. Hereinafter, this threshold is referred to as a first threshold for convenience, and the other threshold is referred to as a second threshold. The second threshold is a value greater than the first threshold. The conditions used for the processing described later are satisfied when the charge / discharge power exceeds the first threshold and falls below the second threshold.

  9 to 11 show examples of the second threshold value as threshold values Th11 to Th13. The threshold value Th11 shown in FIG. 9 is output power when the slope of the line L1 is 5% / kW. In FIG. 9, a line L3 having an inclination of 5% / kW is supplementarily shown. The threshold value Th12 shown in FIG. 10 is output power when the conversion efficiency is 85%. The threshold value Th13 shown in FIG. 11 is, for example, 4 kW output power.

  Next, a series of processing executed by the schedule changing unit 107 of the control device 10 will be described using the flowchart shown in FIG. The process shown in FIG. 12 starts when the control device 10 is turned on.

  First, the schedule changing unit 107 determines whether or not the predicted value of the power generation amount after a certain time exceeds the predicted value of total power consumption (step S21). This fixed time is, for example, 2 hours. When it is determined that the predicted value of the power generation amount exceeds the predicted value of total power consumption (step S21; Yes), the schedule change unit 107 calculates a predicted value of surplus power (step S22).

  Next, the schedule changing unit 107 determines whether or not the storage battery 42 can be charged after a certain time (step S23). This determination is made based on the predicted value of the remaining capacity of the storage battery 42.

  When it is determined that charging is not possible (step S23; No), the schedule changing unit 107 executes surplus power processing (step S24). In this surplus power processing, for example, power sales are planned. Thereafter, the process by the schedule changing unit 107 returns to step S21.

  On the other hand, when it is determined that charging is possible (step S23; Yes), the schedule changing unit 107 assumes the start of charging after a predetermined time (step S25). Next, the schedule changing unit 107 determines whether or not the predicted value of the charging power satisfies a condition (Step S26).

  When it determines with the predicted value of charging power not satisfy | filling conditions (step S26; No), the schedule change part 107 changes an operation schedule (step S28). Specifically, the schedule changing unit 107 changes the driving schedule so that the predicted value of charging power falls below the second threshold after changing the driving schedule so that the predicted value of charging power exceeds the first threshold.

  Thereafter, the process by the schedule changing unit 107 repeats step S26 and subsequent steps. Thereby, the driving schedule is changed so that the predicted value of the charging power after a certain time satisfies the condition.

  When it determines with the predicted value of charging power satisfy | filling conditions satisfy | filling in step S26 (step S26; Yes), the process by the schedule change part 107 returns to step S21.

  When it is determined in step S21 that the predicted value of the power generation amount is less than or equal to the predicted value of total power consumption (step S21; No), the schedule change unit 107 calculates a predicted value of insufficient power (step S29). Next, the schedule changing unit 107 determines whether or not the storage battery 42 can be discharged after a certain time (step S30). This determination is made based on the predicted value of the remaining capacity of the storage battery 42.

  When it is determined that the discharge is not possible (step S30; No), the schedule changing unit 107 executes an insufficient power process (step S31). In this shortage power processing, for example, power purchase is planned. Thereafter, the process by the schedule changing unit 107 returns to step S21.

  On the other hand, when it determines with discharge being possible (step S30; Yes), the schedule change part 107 assumes the start of the discharge after fixed time (step S32). Next, the schedule changing unit 107 determines whether or not the predicted value of the discharge power satisfies the condition (Step S33).

  When it determines with the predicted value of discharge electric power not satisfy | filling conditions (step S33; No), the schedule change part 107 changes an operation schedule. Specifically, the schedule change unit 107 changes the operation schedule so that the predicted value of discharge power falls below the second threshold value after changing the operation schedule so that the predicted value of discharge power exceeds the first threshold value.

  Thereafter, the process by the schedule changing unit 107 repeats step S33 and subsequent steps. Thus, the operation schedule is changed so that the predicted value of the discharge power after a certain time satisfies the condition.

  When it determines with the predicted value of discharge power satisfy | filling conditions satisfy | filling in step S33 (step S33; Yes), the process by the schedule change part 107 returns to step S21.

  As described above, in the present embodiment, the operation schedule is changed so that the predicted value of charge / discharge power in the future satisfies the condition. Thereby, the user can recognize in advance the operation of the device different from the user's intention. Moreover, the frequency with which the operating state of the device is suddenly changed can be suppressed.

  Further, the condition according to the present embodiment is defined using the second threshold value. Thereby, it can prevent that charging / discharging electric power becomes large too much. As a result, it is possible to prevent the life of the storage battery 42 from being extremely shortened.

  As mentioned above, although embodiment of this invention was described, this invention is not limited by the said embodiment.

  For example, although the current sensors 21 to 25 according to the above-described embodiments are connected to the measurement device 20 via signal lines, the present invention is not limited to this. For example, a current sensor for measuring charge / discharge power and the power conversion unit 41 may be connected by a signal line. In this case, the power conversion unit 41 may notify the measurement device 20 of the measured power. Further, the measuring device 20 may be built in the control device 10.

  Further, the program P1 stored in the auxiliary storage unit 13 can be read by a computer such as a flexible disk, a CD-ROM (Compact Disk Read-Only Memory), a DVD (Digital Versatile Disk), and an MO disk (Magnet-Optical Disk). It may be stored in a recording medium and distributed and installed in a computer.

  Further, the program is usually stored in a disk device or the like of a predetermined server device on a communication network such as the Internet, and may be downloaded as necessary.

  Various embodiments and modifications can be made to the present invention 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 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 is suitable for efficient use of electric power stored in a storage battery.

  DESCRIPTION OF SYMBOLS 100 Control system, 10 Control apparatus, 11 Processor, 12 Main memory part, 13 Auxiliary memory part, 14 Input part, 15 Output part, 16 Communication interface 17 Internal bus, 101 Information registration part, 102 Storage part, 103 Charge / discharge determination part , 104 control unit, 105 communication unit, 106 prediction unit, 107 schedule change unit, 20 measuring device, 21-25 current sensor, 31-33 electric equipment, 40 power storage device, 41 power conversion unit, 42 storage battery, 50 power generation device, D1 measurement data, D2 efficiency data, D3 equipment data, D4 schedule data, L1, L2 line, NW network, P1 program.

Claims (18)

Obtaining means for obtaining a measured value of discharge power output from the storage battery by discharging;
An electric device that consumes the discharge power supplied from the storage battery via a conversion unit that converts DC power into AC power is controlled so that a measured value of the discharge power acquired by the acquisition unit exceeds a threshold value. Control means;
Determining means for determining the threshold value from the rate of change of the conversion efficiency of the conversion means relative to the discharge power;
A control device comprising:   The determination unit learns the conversion efficiency of the conversion unit from the history of measurement values acquired by the acquisition unit, and determines the threshold value from the change rate of the learned conversion efficiency.
  The control device according to claim 1. The control means controls the electric device so that the measured value of the discharge power exceeds the threshold and falls below another threshold that is greater than the threshold.
The control device according to claim 1 or 2. A schedule storage means for storing an operation schedule of the electric device;
The control means controls the electric device by changing the operation schedule.
The control device according to any one of claims 1 to 3. Predicting means for predicting the transition of the discharge power;
Schedule changing means for changing the operation schedule so that the predicted value of the discharge power exceeds the threshold ;
The control device according to claim 4, further comprising: The change of the operation schedule includes extending the operation time of the electrical equipment,
The control device according to claim 4 or 5. The change of the operation schedule includes simultaneously operating a plurality of the electric devices.
The control device according to any one of claims 4 to 6. The measurement value of the discharge power is the measurement value of the discharge power input to the conversion unit, or the measurement value of the discharge power output from the conversion unit.
The control device according to any one of claims 1 to 7. An acquisition means for acquiring a measured value of charging power supplied from the power generation means to the storage battery via a conversion means for converting AC power into DC power;
Control means for controlling an electric device that receives the power from the power generation means together with the storage battery so that the measured value of the charging power acquired by the acquisition means exceeds a threshold ;
Determining means for determining the threshold value from the rate of change of the conversion efficiency of the conversion means relative to the charging power;
A control device comprising:   The determination unit learns the conversion efficiency of the conversion unit from the history of measurement values acquired by the acquisition unit, and determines the threshold value from the change rate of the learned conversion efficiency.
  The control device according to claim 9. A schedule storage means for storing an operation schedule of the electric device;
The control means controls the electric device by deferring the operation schedule of the electric device.
The control device according to claim 9 or 10. Device data storage means for storing device data associating the operating state of the electrical device with the value of power consumption;
The control means controls the electrical device based on the device data.
The control device according to any one of claims 1 to 11. A measuring means for measuring discharge power output from the storage battery by discharging;
The control device according to any one of claims 1 to 8, which controls an electric device based on a result of measurement by the measurement unit;
A control system comprising: Measuring means for measuring charging power supplied from the power generation means to the storage battery;
The control device according to any one of claims 9 to 11, which controls an electrical device based on a result of measurement by the measurement unit;
A control system comprising: An acquisition step of acquiring a measured value of discharge power output from the storage battery by discharging;
A determination step of determining a threshold from the rate of change of the conversion efficiency of the conversion means for converting DC power into AC power with respect to the discharge power;
A control step of controlling an electric device that consumes the discharge power supplied from the storage battery via the conversion means so that a measured value of the discharge power acquired in the acquisition step exceeds the threshold ;
Control method. An acquisition step of acquiring a measured value of charging power supplied from the power generation means to the storage battery via a conversion means for converting AC power into DC power;
A determination step of determining a threshold value from the rate of change of the conversion efficiency of the conversion means relative to the charging power;
A control step of controlling an electric device that receives power from the power generation means together with the storage battery so that the measured value of the charging power acquired in the acquiring step exceeds the threshold ;
Control method. Computer
An acquisition means for acquiring a measured value of discharge power output from the storage battery by discharging,
An electric device that consumes the discharge power supplied from the storage battery via a conversion unit that converts DC power into AC power is controlled so that a measured value of the discharge power acquired by the acquisition unit exceeds a threshold value. Control means,
Determining means for determining the threshold value from the rate of change of the conversion efficiency of the conversion means relative to the discharge power;
Program to function as. Computer
An acquisition means for acquiring a measured value of charging power supplied from the power generation means to the storage battery via a conversion means for converting AC power to DC power;
Control means for controlling an electric device that receives the power from the power generation means together with the storage battery so that the measured value of the charging power acquired by the acquisition means exceeds a threshold value;
Determining means for determining the threshold value from the rate of change of the conversion efficiency of the conversion means relative to the charging power;
Program to function as.

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