JP2015010941A - Power display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power display device for preventing erroneous recognition of a user recognizing a power value on a display part.SOLUTION: A power display device 1 includes: an obtainment unit 31 for detecting a purchased power value purchased from a system 3, a supplied power value supplied by a power supply device, and a consumed power value consumed in a load 5; a computation unit for correcting at least one of the purchased power value, supplied power value and consumed power value in a case where a value produced by subtracting the consumed power value from a total of the purchased power value and the supplied power value is a value other than zero; and a display unit 39 for displaying the purchased power value, supplied power value and consumed power value computed by the computation unit.

Description

  The present invention relates to a power display device.

  In recent years, for example, a solar cell device and a fuel cell device are known as distributed power sources provided to power consumers. A distributed power supply system in which these distributed power supplies are combined with a commercial power system, a load, and a power storage device is spreading. In such a distributed power supply system, the amount of power generated by the solar cell device, the amount of power consumed by the load, the amount of power purchased / sold from the commercial power system is measured, and the value obtained by calculating each amount of power is calculated. Displayed on a display device. Thereby, the information of each electric power can be provided to a user (refer patent document 1).

Japanese Patent Laid-Open No. 10-201106

  Each power value is measured using, for example, a plurality of sensors, but the measured values of the sensors are not always displayed as they are on the display unit. Specifically, even if each sensor measures each power value up to 3 digits after the decimal point, there may be a case where only one digit after the decimal point is displayed on the display unit to be confirmed by the user. This is because the user does not need information up to three digits after the decimal point, or displays only one digit after the decimal point in favor of easy viewing.

  For example, in the case where the power consumption of the load is covered by the generated power of the solar cell device and the purchased power from the commercial power system, the formula of the generated power value + the purchased power value−the consumed power value = zero holds theoretically. However, as described above, when each power value is output to the display device in a state where the second decimal place is rounded off or rounded off, the above formula may not be satisfied. This may give the user a misunderstanding that a failure or construction error has occurred in a device such as a sensor or a display device.

  One of the objects of the present invention is to provide a power display device that makes it difficult to misidentify a user who recognizes a power value on a display unit.

  The power display device according to an embodiment of the present invention includes: an acquisition unit that detects a purchased power value purchased from a grid, a supplied power value supplied by a power supply device, and a consumed power value consumed by a load; When the calculated value obtained by subtracting the power consumption value from the sum of the power value and the power supply value is a value other than zero, the power purchase power value, the power supply value, and the power consumption value A calculation unit that corrects at least one value, and a display unit that displays the purchased power value, the supplied power value, and the power consumption value calculated by the calculation unit.

  According to the power display device according to the embodiment of the present invention, since the detected power amount value is corrected and displayed on the display unit, it is difficult for the user to misunderstand equipment failure or construction error. be able to.

FIG. 1 is a schematic configuration diagram of a distributed power supply system. FIG. 2 is a schematic configuration diagram of the power display device according to the first embodiment of the present invention. FIG. 3 is a process diagram showing a flow of processing of each power value of the power display device according to the first embodiment of the present invention. FIG. 4 is a flowchart showing processing of the power display device according to the first embodiment of the present invention. FIG. 5 is a flowchart showing processing of the power display device according to the second embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIG. 1, the distributed power supply system 10 includes a power display device 1, a renewable power generation device 7 connected to a commercial power system (hereinafter abbreviated as “system” as appropriate) 3 and a load 5, and a system 3. And a non-renewable energy supply device 9 connected to the load 5 and a sensor 11.

  The power display device 1 has a display unit that displays a power state. The power display device 1 displays, for example, the generated power of the renewable energy power generation device 7 or the output power of the non-renewable energy supply device 9, the power consumption of the load 5, and the power purchased / sold from the grid 3. . Such a power display device 1 can be realized as one of the functions of an EMS (Energy Management System) device, for example. The details of the configuration and functions of the power display device 1 will be described later.

  The grid 3 is managed by an electric power company and supplies power to the load 5 (power purchase) or receives power from the renewable energy power generation device 7 (power sale). The system 3 is connected to a load 5 (loads 5a to 5c in FIG. 1) by a power line 13 (solid line in FIG. 1). The power line 13 branches in parallel and is connected to the renewable energy power generation device 7 and the non-renewable energy supply device 9. As a result, the grid 3, the renewable energy power generation device 7, and the non-renewable energy supply device 9 can supply power to the load 5 through the power line 13. The load 5 is, for example, a household electric product such as an air conditioner, a refrigerator, or a TV (television receiver).

  In FIG. 1, a single-phase two-wire system is assumed as the power distribution method of the system 3 (the ground wire is omitted), but the present invention is not limited to the single-phase two-wire system. Applicable to three-wire and three-phase three-wire systems.

  The renewable energy power generation device 7 generates power from renewable energy, and is, for example, a solar cell device, a wind power generation device, or a wave power generation device. In the present embodiment, it is assumed that the renewable energy power generation device 7 is a solar cell device (hereinafter, the reference numeral 7 is also used for the solar cell device). This renewable energy power generation device 7 can also be said to be a power supply device. The supply power supplied to the load 5 in the solar cell device 7 is generated power. The solar cell device 7 includes a solar cell 21 and a solar cell PCS (Power Conditioning System) 23. The solar cell 21 outputs a direct current output in response to the reception of sunlight, and the solar cell PCS 23 converts the direct current output into an alternating current output. Further, the solar cell device 7 has a sensor (not shown) that detects an AC output from the solar cell PCS 23, and the sensor transmits the detected value (output value) to the power display device 1 as power value data. To do. The output value of the alternating current from the solar cell device 7 is a current value or a power value. In the following description, it is assumed that the output value is a power value in the present embodiment, and the calculation of power is not performed in the power display device 1.

  The non-renewable energy supply device 9 supplies non-renewable energy, and is, for example, a power storage device or a fuel cell device. In the present embodiment, the non-renewable energy supply device 9 is assumed to be a power storage device (hereinafter, the symbol 9 is also used for the power storage device). This non-renewable energy supply device 9 can also be said to be a power supply device. Note that the supply power supplied to the load 5 in the power storage device 9 is the output power charged in the storage battery. The power storage device 9 includes a storage battery 25 and a storage battery PCS27. The storage battery 25 accumulates electric power from the system 3 and the solar cell device 7 and outputs the accumulated electric power as a direct current output. The storage battery PCS27 converts a DC output from the storage battery into an AC output, or converts an AC output from the system side into a DC output. The power storage device 9 includes a sensor (not shown) that detects an AC output from the storage battery PCS27, and the sensor transmits the detected value to the power display device 1 as power value data.

  The renewable energy power generation device 7 and the non-renewable energy supply device 9 are connected to the power display device 1 by a wired or wireless communication line 17 (one-dot broken line in FIG. 1), and a generated power value and an output power value are signaled ( Data). Therefore, when receiving this signal, the power display device 1 does not have to perform direct measurement.

  The sensor 11 is connected to the power display device 1 through a wired or wireless signal line 15 (broken line in FIG. 1) and can receive a generated power value or an output power value as a measurement or a signal (data). When the sensor 11 does not have a function of outputting a power value, the power display device 1 receives a current signal, calculates power, and converts it into data. In FIG. 1, sensors 11 </ b> A, 11 </ b> B, and 11 </ b> C that measure the power consumption of each of the plurality of loads 5, and a sensor 11 </ b> D that measures the purchased power from the grid 3 or the sold power from the renewable energy power generator 7. As an example. Therefore, in the following description, the power consumption value refers to the total load power value obtained by combining the power values of the sensors 11A, 11B, and 11C.

  In FIG. 1, one load 5, one renewable energy power generation device 7 and one non-renewable energy supply device 9 are shown, but the present invention is not limited to this embodiment, and two each. This can be provided. In this case, two or more renewable energy power generation devices are connected in parallel with respect to the power line 13. The present invention is not limited to realizing the power display device 1 as a device separate from the renewable energy power generation device 7 and the non-renewable energy supply device 9. For example, the power display device 1 may be realized as a part of the renewable energy power generation device 7 or the non-renewable energy supply device 9.

  As illustrated in FIG. 2, the power display device 1 includes an acquisition unit 31, a storage unit 33, a communication unit 35, a control unit 37, and a display unit 39. The acquisition unit 31, the storage unit 33, the communication unit 35, and the display unit 39 are connected to a control unit (calculation unit) 37.

  The acquisition unit 31 acquires a power value or a current value for calculating the power value from the sensor 11, and has a function of communicating with the sensor 11, for example. The communication unit 35 has a communication function of acquiring a power value or a current value output from each device from sensors included in the solar cell device 7 and the power storage device 9. In general, the solar cell device 7 and the power storage device 9 are equipped with communication terminals conforming to serial communication standards such as RS232C and RS485, so that they can be used. However, the method is not particularly limited as long as the data received by the communication unit 35 can be identified as a power value. In the present invention, a communication unit 35 to be described later for communicating with the solar cell device 7 and the power storage device 9 is expressed as a functional block separate from the acquisition unit 31, but the acquisition unit 31 functions as a communication unit. However, the present invention is not limited to this embodiment. That is, the present invention is not limited to realizing the acquisition unit 31 and the communication unit 35 by separate hardware. The power display device 1 can also have one communication unit that has both the function of the acquisition unit 31 and the function of the communication unit 35.

  The storage unit 33 stores various types of information such as a program describing processing contents for realizing each function of the power display device 1 and an acquired power value, and also functions as a work memory or the like. The storage unit 33 is, for example, a memory or an HDD. The communication unit 35 receives information on the output power value from the solar cell device 7 and the power storage device 9 via the communication line 17, or transmits an instruction signal for controlling the output power to the power storage device 9. It is something to do.

  The control unit 37 executes a program describing the processing contents for realizing each functional block of the power display device 1, and is, for example, a CPU (Central Processing Unit) or a DSP (Digital Signal Processor). Thereby, the control unit 37 controls and manages the entire power display device 1. The control unit 37 has a function as a calculation unit that performs various determination calculations.

  Next, a power display method of the power display device 1 will be described with reference to FIG. In addition, in the following description, it demonstrates using the solar cell apparatus 7 as an electric power supply apparatus.

  The process in the power display can be roughly divided into two. The first step is an integration step for integrating the power values measured with high accuracy. In this integration step, the power information obtained from each sensor 11, the solar cell device 7 and the power storage device 9 is integrated while keeping the measured numerical values as much as possible. Specifically, in this integration step, integration is performed without cutting off the number of digits after the decimal point. In the example of FIG. 3, in the integration step (1), the purchased power value, the generated power value and the power consumption value are acquired from the acquisition unit 31 and the communication unit 35 or the power value is calculated from the current value, and the next integration step (2 ) To add them up. Integration is performed in units of several minutes, several hours, one day, one month, and one year, and is accumulated in the storage unit 33. At this time, if it is the amount of monthly power purchase and the amount of monthly power sale, it is required to substantially match the content of the electricity usage notice presented monthly by the power company.

  In the integration step (3), the integrated power amount for an arbitrary period requested by the user or the like is recalculated from each integrated value in the storage unit 33 and is output to the display unit 39, an external output device, or the like. This output request may be requested by a management company connected to the Internet through the communication unit 35 in addition to the direct operation by the user. In some cases, information may be sent to a service company to obtain information such as various diagnoses and power saving advice.

  The second process is a display process for displaying each power value on the display unit 39. This display step includes a step of calculating a numerical value for display on the display unit. In the display step, first, in the display step (1), information on the purchased power value, the generated power value, and the power consumption value obtained in the integrating step is acquired. In the example of FIG. 3, the information is acquired before the integration / storage process, but the present invention is not limited to this, and the integrated value for several seconds to several minutes is stored even after being stored in the storage unit 33. Etc. may be used as real-time measured values. If the integrated power amount is also a display item, information on the integrated purchased power amount value, integrated generated power amount value, and integrated power consumption value is also acquired in the display step (2). Next, each electric power value or each electric energy value acquired from the integration process is processed into a numerical value in accordance with the number of display digits. Specifically, numerical processing such as unit change, rounding down to the nearest decimal point, and rounding off can be given.

Next, in the display step (3), it is calculated whether the total becomes zero using the purchased power value, the generated power value, and the power consumption value after processing. If this sum does not become zero, the displayed power value is corrected, and display is performed so that the sum is zero. The same processing is performed when the integrated power amount value does not become zero. By the above process, the display process (
The numerical value displayed on the display unit 39 in 4) can make it difficult for the user to misidentify a device failure or the like.

  Next, the control flow of this embodiment will be specifically described with reference to FIG. In addition, in the following description, it demonstrates using the solar cell apparatus 7 as an electric power supply apparatus.

  First, the acquisition value 31 of the power display device 1 detects the output value of the sensor 11 (11D) and acquires the purchased power value (STEP 1). At this time, if the sensor 11 is a power sensor, the power information may be taken in as it is. On the other hand, when the sensor 11 is a current sensor, the acquired current value is sent to the control unit 37, and the power value is calculated together with voltage information of a voltage sensor (not shown) for measuring the system voltage. Should be obtained.

  Next, the communication unit 35 receives the generated power information including the generated power value from the solar cell PCS23 of the solar cell device 7 (STEP 2). The generated power information includes, for example, additional information such as the measured time because the measured time is uncertain only with the generated power value, and it may be retransmitted data when there is a communication error. It is a thing. This includes a checksum for detecting a communication error. However, if the generated power value is continuously transmitted as real-time data, the above-described information is unnecessary, and therefore, only the generated power value information may be received (acquired).

  Next, the acquisition unit 31 detects the output value of the sensor 11 (11A to 11C) and acquires the power consumption value (STEP 3). At this time, if the sensor 11 is a power sensor, the power information may be taken in as it is. However, if the sensor 11 is a current sensor, the acquired current value is sent to the control unit 37 to measure the system voltage (not shown). The power value is calculated together with the voltage information. Note that if the sensor 11 has a communication function such as a smart tap, the communication unit 35 may receive the purchased power information. STEP1, STEP2, and STEP3 may be executed from any step. About STEP3, the difference of the generated electric power value of STEP2 may be calculated from the purchased electric power value acquired by STEP1, and you may acquire as a power consumption value. Thereby, since installation of sensors 11A-11C becomes unnecessary, parts reduction and construction reduction can be aimed at.

  After an acquisition process for acquiring information on each power value, a calculation process is performed in which each power value is calculated by the control unit 37 and converted into a numerical value for display (STEP 4 to STEP 9). Next, the calculation process will be described in detail.

  First, the purchased power value acquired in STEP 1 is converted into a numerical value for display (STEP 4). Specifically, numerical calculation processing such as unit change, rounding down after the decimal point, and rounding off is performed in accordance with the number of digits displayed on the display unit 39 and the like. For example, if the purchased power value acquired in STEP 1 is 1041 [W], it is converted to [kW] by unit conversion and the final digit is rounded down. Thereby, the purchased power value displayed on the display unit 39 is 1.0 [kW].

  Next, the generated power value acquired in STEP 2 is converted into a numerical value for display (STEP 5). In addition, the calculation process of the control part 37 accompanying the said conversion of a generated electric power value should just be the same as that of STEP4.

  Next, the power consumption value acquired in STEP 3 is converted into a numerical value for display (STEP 6). Note that the arithmetic processing associated with the conversion of the power consumption value may be the same as in STEP4. STEP4, STEP5 and STEP6 may be executed from any step.

  Next, it is determined whether or not a calculated value (hereinafter referred to as calculated value A) obtained by subtracting the power consumption value from the total of the purchased power value and the generated power value is other than zero (STEP 7). In FIG. 4, STEP 7 is a flow for determining whether or not the purchased power value + the generated power value−the consumed power value ≠ zero. On the other hand, STEP 7 may be replaced with a flow for determining whether or not the purchased power value + the generated power value−the consumed power value = zero. In this case, the Yes and No branch destinations of STEP 7 are reversed.

  In STEP 7, when the calculated value A from each power value is zero, no correction is necessary. Therefore, each power value is displayed on the display unit 39 (STEP 11). Note that the flow of FIG. 4 is repeated each time the power value is displayed on the display unit 39.

  On the other hand, if the calculated value A is not zero in STEP 7, the control unit 37 corrects one of the purchased power value, the generated power value, and the consumed power value. In the case where the power consumption of the load 5 is covered by the generated power of the solar cell device 7 and the purchased power from the grid 3, theoretically, the generated power value + the purchased power value−the consumed power value = zero (hereinafter referred to as “zero”). This is because the formula A) holds. The reason why this equation does not hold is due to the arithmetic processing for converting the power values of STEP 4 to STEP 6 into display numerical values.

  Specifically, for example, the power values obtained in STEP 1 to STEP 3 are the purchased power value: 1.041 [kW], the generated power value: 1.209 [kW], and the consumed power value: 2.250 [kW]. ], The calculated value A becomes zero.

  On the other hand, when the power values obtained in STEP 1 to STEP 3 are converted by rounding off the third decimal place in STEP 4 to STEP 6, the purchased power value is 1.04 [kW], and the generated power value is 1.20. [KW], power consumption value: 2.25 [kW]. In this case, the calculated value A does not become zero. Therefore, a user who has confirmed the calculated value A on the display unit 39 may mistakenly recognize that a failure or a construction error has occurred in a device such as a sensor or a display device. Therefore, in the present embodiment, the power value of any one of the purchased power value, the generated power value, and the consumed power value is corrected so that Formula A is satisfied.

  Next, it is determined whether or not the calculated value A of the difference obtained by subtracting the power consumption value from the total of the purchased power value and the generated power value is a positive value (STEP 8). STEP 8 in FIG. 4 shows a flow for determining whether or not the purchased power value + the generated power value−the consumed power value> zero. When the calculated value A is a positive value, the generated power value is corrected so that the calculated value A becomes zero. More specifically, it correct | amends so that a generated electric power value may be reduced by the part of the calculation value A obtained by STEP7 or STEP8 (STEP9).

  Here, the reason why the target to be corrected is the generated power value will be described. In order to establish Formula A when the calculated value A is a positive value, correction for reducing the purchased power value, the generated power value, or the power consumption value may be performed. The purchased power value may be measured in real time by a power meter of an electric power company, or the power consumption value may be measured by a smart tap or the like. For this reason, the possibility that the difference between the measured value of the electric power company and the display value of the display unit 39 is increased, and thus the correction of the purchased power value or the consumed power value has a great influence on the user. On the other hand, even if the generated power value is displayed small, the actual purchased power value is small because the actual generated power value is larger than the displayed value. Thereby, the electricity bill charged by the electric power company can be lower than the assumed value. Therefore, the correction for reducing the generated power value has less influence on the user than the correction for reducing the purchased power value or the consumed power value.

On the other hand, when the difference obtained by subtracting the power consumption value from the total of the purchased power value and the generated power value is a negative value in STEP 8, the purchased power value is set so that the calculated value A becomes zero. Correct (S
TEP10). More specifically, correction is made so that the purchased power value is increased by the calculated value A obtained in STEP 7 or STEP 8.

  Here, the reason why the correction target is the purchased power value will be described. When the calculated value A is a negative value, in order to establish the expression A, the purchased power value or the generated power value is increased or the consumed power value is decreased. Among these corrections, the correction for increasing the generated power value is likely to give a misunderstanding to the user that power is generated even when the solar cell device 7 is not generating power. Further, the correction for reducing the power consumption value is likely to mislead the user that the power consumption of the load 5 is reduced. Therefore, the correction of the generated power value and the power consumption value has a great influence on the user. On the other hand, in the correction for increasing the purchased power value, even if the purchased power value is displayed large, the actual purchased power value is small. Thereby, the electricity bill charged by the electric power company can be lower than the assumed value. Therefore, the correction for increasing the purchased power value has less influence on the user than the correction for increasing the generated power value or decreasing the power consumption value.

  The power value (the purchased power value or the generated power value) corrected in STEP 9 or STEP 10 and the other two power values are displayed on the display unit 39 (STEP 11). The power values not corrected in STEP 9 and STEP 10 use the numerical values converted in STEP 4 to STEP 6 as they are for display. In the case of the integrated power amount value, the flow may be executed by replacing each power value with each integrated power amount value.

  As described above, the power display device 1 according to the present embodiment uses the power value or the integrated power amount value displayed on the display unit 39 as the error of the sensor (power sensor or current sensor), the correction accuracy, the measured numerical value, Regardless of the difference in the number of digits of the displayed numerical value or the difference in accuracy of the power value output from the device, the display is performed after optimization so that each power value matches the above formula. Thereby, it is possible to make it difficult for the user to misidentify a failure or a construction error. As a result, unnecessary complaint handling work and maintenance costs are reduced.

  In addition, although this embodiment demonstrated using the solar cell apparatus 7 as an electric power supply apparatus, you may use the electrical storage apparatus 9 instead of the solar cell apparatus 7. FIG. In this case, the generated power value corresponding to the power supply value of the power supply device may be replaced with the output power value of the power storage device 9. At this time, information on the output power value may be acquired from the power storage device 9 by the communication unit 35 of STEP2.

  Moreover, you may provide both the solar cell apparatus 7 and the electrical storage apparatus 9 as an electric power supply apparatus. In the case of such a distributed power supply system 10, in step 2 of the flowchart of FIG. 4, in addition to acquiring power generation information by the communication unit 35, output power information is also acquired from the power storage device 9, and in FIG. The generated power value may be replaced with the supplied power value (generated power value + output power value). Even if the supplied power value is corrected instead of the generated power value in STEP 9, the disadvantage to the user is small as compared with the arithmetic processing for correcting other power values. Thus, the same effect can be obtained also in the distributed power supply system 10 to which the plurality of renewable energy power generation devices 7 and the non-renewable energy supply device 9 are connected.

(Second Embodiment)
The second embodiment is a distributed power supply system 10 in which reverse power flow (sold power) from the solar cell device 7 to the grid 3 is also performed. The present embodiment will be described with reference to FIG.

  In the present embodiment, in FIG. 1, the output capacity of the solar cell device 7 (or the total power capacity of the output power with the power storage device 9) is larger than that of the load 5, and power can be sold to the system 3 by reverse power flow. This is different from the first embodiment. In addition, when there is no power sale, since it is the same state as 1st Embodiment, the control of STEP4-STEP10 shall be used. This will be specifically described below with reference to FIG.

  First, the acquisition unit 31 of the power display device 1 acquires the output value of the sensor 11 (11D) to acquire the power sale power value (STEP 21).

  Next, the communication unit 35 receives the generated power information including the generated power value from the solar cell PCS23 of the solar cell device 7 (STEP 22). Here, when other renewable energy power generation devices 7 and non-renewable energy supply devices 9 are further connected, their generated power information and output power information are also sequentially received, and the power value or the accumulated power amount Calculate the total value.

  Next, the acquisition unit 31 acquires the power consumption value from the output of the sensor 11 (11A to 11C) (STEP 23). At this time, the output of a plurality of sensors is used as a total power consumption value. When the integrated power consumption is used, the control unit 37 calculates based on the data stored in the storage unit 33.

  After an acquisition process for acquiring information on each power value, a calculation process is performed in which each power value is calculated by the control unit 37 and converted into a numerical value for display (STEP 24 to STEP 30). Next, the calculation process will be described in detail. Note that the following calculation process will be described mainly in the case where a reverse power flow (power sale) to the grid 3 is occurring and the purchased power value is zero.

  First, the power sale power value acquired in STEP 21 is converted into a numerical value for display (hereinafter, power sale power value) (STEP 24). Next, the generated power value acquired in STEP 22 is converted into a numerical value for display (STEP 25). Next, the power consumption value acquired in STEP 23 is converted into a numerical value for display (STEP 26). Note that the arithmetic processing of the control unit 37 accompanying the conversion of each numerical value may be the same as in STEP4. Further, STEP 24, STEP 25, and STEP 26 may be executed from any step.

  Next, whether or not a difference obtained by subtracting the power consumption value from the total of the purchased power value (zero in this embodiment) and the generated power value (hereinafter referred to as a calculated value B) is not the same value as the sold power value. Determine (STEP 27). In FIG. 5, STEP 27 is a flow for determining whether or not the generated power value−the consumed power value ≠ the sold power. On the other hand, STEP 27 may be replaced with a flow for determining whether or not the generated power value−the consumed power value = the sold power value. In this case, the Yes and No branch destinations of STEP 27 are reversed. In STEP 27, the purchased power value is zero, but can be modified to include the purchased power value + the generated power value−the consumed power value−the sold power value ≠ zero in terms of an expression including the purchased power value.

  In STEP 27, when the calculated value B obtained by subtracting the power consumption value from the generated power value is equal to the power sale power value, no correction is necessary. Therefore, each power value is displayed on the display unit 39 (STEP 31). Note that the flow of FIG. 4 is repeated each time the power value is displayed on the display unit 39.

  On the other hand, when the calculated value B is not equal to the sold power value in STEP 27, the control unit 37 corrects any one of the generated power value, the consumed power value, and the sold power value. This is because, when the generated power of the solar cell device 7 covers the power consumption of the load 5 and the surplus generated power flows backward to the grid 3, theoretically, the generated power value−the consumed power value = the sold power value. This is because the formula (hereinafter referred to as Formula B) holds. The reason why this formula B is not satisfied is caused by the arithmetic processing as in STEP 7 of the first embodiment.

  Next, it is determined whether or not the calculated value B is smaller than the power selling power value (STEP 28). STEP 28 is shown in FIG. 5 as a flow for determining whether or not the generated power value−the consumed power value <the sold power value. If the calculated value B is smaller than the sold power value, the sold power value is corrected so that the calculated value B is the same value as the sold power value (STEP 29). More specifically, the power sale power value is corrected so as to decrease by the calculated value B obtained in STEP 27 or STEP 28.

  Here, the reason why the target to be corrected is set to the power selling power value will be described. In order to establish Formula B when the calculated value B is smaller than the power sale power value, correction may be performed to increase the generated power value, reduce the power consumption value, or reduce the power sale power value. . At this time, the correction for increasing the generated power value or reducing the power consumption value may cause the electricity rate to be higher than the assumed value as described in the first embodiment, and has a great influence on the user. On the other hand, even if the power sale power value is displayed small, the actual power sale power value is larger than the display value, so that the profit obtained by the user by the power sale can be higher than the assumed value. Therefore, the correction for reducing the power sale power value has less influence on the user than the power generation value or the power consumption value is corrected.

  On the other hand, when the calculated value B is larger than the sold power value, the generated power value is corrected so that the calculated value B becomes the same value as the sold power value (STEP 30). More specifically, it correct | amends so that generated electric power value may be reduced by the part of the calculation value B obtained by STEP27 or STEP28.

  Here, the reason why the target to be corrected is the generated power value will be described. In order to establish Formula B when the calculated value B is larger than the power selling power value, correction may be performed to reduce the generated power value, increase the power consumption value, or increase the power selling power value. . At this time, the correction for increasing the power consumption value is, as described in the first embodiment, when the power consumption value is measured with a smart tap or the like, the measured value of the power company or the like and the display value of the display unit 39 The possibility of widening the difference increases. Further, in the correction for increasing the power sale power value, the profit obtained by the user by the power sale can be lower than the assumed value. Therefore, the correction of the power consumption value or the power sale power value has a great influence on the user. On the other hand, even if the generated power value is displayed small, the actual generated power value is larger than the displayed value. As a result, the power selling power value becomes higher than the expected value, and the user's profit may increase. Therefore, the correction for reducing the generated power value has less influence on the user than the correction for increasing the power consumption value or the power sale power value.

  The power value (power sale power value or generated power value) corrected in STEP 29 or STEP 30 and other power values are displayed on the display unit 39 (STEP 31). Note that the power values not corrected in STEP 29 and STEP 30 use the numerical values converted in STEP 24 to STEP 26 as they are for display. In the case of the integrated power amount value, the flow may be executed by replacing each power value with each integrated power amount value.

  As described above, the power display device 1 according to the present embodiment displays each power value after optimizing the same as in the first embodiment. Thereby, it is possible to make it difficult for the user to misidentify a failure or a construction error. As a result, unnecessary complaint handling work and maintenance costs are reduced.

  In addition, although this embodiment demonstrated using the solar cell apparatus 7 as an electric power supply apparatus, the electrical storage apparatus 9 may be used instead of the solar cell apparatus 7 similarly to 1st Embodiment, and the solar cell apparatus 7 is used. And the power storage device 9 may be provided. Even if the supplied power value is corrected instead of the generated power value in STEP 30, the disadvantage to the user is small compared to the arithmetic processing for correcting other power values.

Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention.

  For example, functions included in each member, each means, each step, etc. can be rearranged so as not to be logically contradictory, and a plurality of means, steps, etc. can be combined or divided into one. Is possible. In addition, any of the purchased power value, the generated power value, the consumed power value, and the sold power value can be calculated from other power values, and it is not always necessary to use an actually measured value.

1 Power display device 3 Commercial power system (system)
5 Load 7 Renewable energy power generation device (solar cell device)
9 Non-renewable energy supply device (power storage device)
DESCRIPTION OF SYMBOLS 10 Distributed power supply system 11 Sensor 13 Power line 15 Signal line 17 Communication line 21 Solar cell 23 Solar cell PCS
25 Storage battery 27 Storage battery PCS
31 Acquisition Unit 33 Storage Unit 35 Communication Unit 37 Control Unit 39 Display Unit

Claims (6)

An acquisition unit for detecting the purchased power value purchased from the grid, the supplied power value supplied by the power supply device, and the consumed power value consumed by the load;
When the calculated value obtained by subtracting the power consumption value from the total of the power purchase power value and the power supply value is a value other than zero, the power purchase power value, the power supply value, and the power consumption An arithmetic unit for correcting at least one of the values;
A power display device comprising: a display unit configured to display the purchased power value, the supplied power value, and the power consumption value calculated by the calculation unit.   When the calculated value of the difference obtained by subtracting the power consumption value from the total of the purchased power value and the supplied power value is a positive value, the calculation unit is configured so that the calculated value becomes zero. The power display device according to claim 1, wherein the power supply value is corrected.   The calculation unit is configured to reduce the calculated power to zero when the difference obtained by subtracting the power consumption value from the total of the purchased power value and the supplied power value is a negative value. The power display device according to claim 1, wherein the value is corrected. When selling a part of the power generated by the power generator to the grid,
The acquisition unit detects a power sale power value,
When the difference obtained by subtracting the power consumption value from the total of the power purchase power value and the supply power value is not the same value as the power sale power value, the calculation unit, the power purchase power value, the supply power value, Correcting at least one of the power consumption value and the power selling power value;
The power display device according to claim 1, wherein the display unit displays the power sale value.   When the power sale power value is larger than the difference obtained by subtracting the power consumption value from the sum of the power purchase power value and the supply power value, the calculation unit calculates the power sale power value. The power display apparatus according to claim 4, wherein the power selling power value is corrected so as to have the same value.   When the power selling power value is smaller than the difference obtained by subtracting the power consumption value from the sum of the purchased power value and the supplied power value, the calculation unit calculates the sum of the power selling power value and the power selling power value. The power display device according to claim 4, wherein the supply power value is corrected so as to be the same value.

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