JP2010206878A - Energy monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an energy monitoring system for appropriately calculating a final amount of energy which is reversely made to flow from a building even if an energy that can reversely be made to flow and an energy that cannot reversely be made to flow coexist. <P>SOLUTION: The system includes a first generation amount measuring means measuring an amount of energy which is generated by an energy generation facility installed in the building and can reversely be made to flow, a second generation amount measuring means measuring an amount of energy which is generated by the energy generation facility installed in the building and cannot reversely be made to flow, a use amount measuring means measuring the energy amount used in the building, and a reverse flow amount calculating means calculating a final amount of discharge energy which is reversely made to flow from the building based on the respective measurement values obtained from the measuring means. The reverse flow amount calculating means includes an intermediate value calculating means calculating a reverse flow intermediate value based on the use amount measuring value and a second generation amount measurement value and a final value calculating means calculating a reverse flow final value based on the intermediate value and a first generation amount measurement value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an energy monitoring system.

  With the recent trend toward energy conservation, both companies and individuals are increasingly demanding energy reduction. In order to meet these demands, energy conservation measures at the business activity level of corporations are being actively implemented, but at the present time when some measures have been advanced, it is difficult to expect any further significant reduction. On the other hand, energy conservation measures at the individual and household levels have not progressed so much, and it is expected that the effect is expected to be greater than the above-mentioned corporate activities by taking effective energy conservation measures at that level.

  As part of such household-level energy-saving measures, a so-called energy-saving monitor that can integrate and display the amount of usage that can be mechanically acquired for each household, such as electricity, gas, and water, is provided. Has been. In this method, a measuring instrument is installed in an electric meter or a gas meter to acquire the amount used, and the evaluation is displayed by comparing the amount used with the previous month or with a set target value. For example, Patent Literature 1 proposes a water amount management device for the purpose of grasping the use state of tap water as supplied energy.

  In the water amount management device, the amount of water flowing through the primary side water pipe and the secondary side water pipe is measured by the flow rate measuring means, and the used flow rate information is displayed. The flow rate information display means includes an integrating means for measuring the flow rate signal, a water consumption switch for setting and resetting the measurement value of the integration means, a storage means for storing the measurement value of the integration means by setting the water consumption switch, Equipped with a display unit that displays the measured value stored in the storage means, it is possible to grasp the amount of water used by each faucet or life behavior, raise the consumption consciousness of living water, and promote the resident's life management and energy saving .

Japanese Patent Laid-Open No. 05-164593

  By the way, in recent years, it has facilities for generating electric power that can flow backward to commercial current, such as solar power generation, and is not capable of reverse flow, such as a gas cogeneration device, and is intended for consumption only in the home (in the house). Buildings with facilities to generate electricity that cannot be reversed are also being built.

  However, in the configuration disclosed in the above-mentioned Patent Document 1, only a configuration for measuring the flowing energy by the flow rate measuring means is disclosed, and the configuration cannot be reversely flowed with the above-described energy capable of reverse flow. It is difficult to easily monitor the energy circulation system that contains a lot of energy, and even if it is adopted, it is necessary to install a flow rate measuring means for each energy flow path. There has been a problem that the cost of the energy management device is increased and labor is required, such as the design of the arrangement position of the means and a significant change in the processing process.

  Accordingly, the present invention provides an energy monitoring system that can appropriately calculate the amount of energy finally flowing backward from a building even when reverse flowable energy and non-reverse flowable energy are mixed. The purpose is to provide.

As a specific means for solving the above problems, the energy monitoring system according to the present invention is:
(1) a first generation amount measuring means for measuring a generation amount of energy that can be reverse-flowed by the energy generation facility provided in the building;
Second generation amount measuring means for measuring the amount of energy generated by the energy generation facility provided in the building and incapable of reverse power flow;
Usage measurement means for measuring the amount of energy used in the building;
A reverse tide flow rate calculating means for calculating an amount of energy to be finally discharged from the building based on the measured values obtained from the first generated amount measuring means, the second generated amount measuring means, and the usage amount measuring means; With
The reverse tide flow rate calculating means includes:
Intermediate value calculating means for calculating a reverse power flow intermediate value based on the used amount measurement value and the second generation amount measurement value;
A final value calculating means for calculating a reverse power flow final value based on the intermediate value and the first generation amount measurement value;
It is characterized by having.

  According to this, first, an intermediate value is calculated based on the measured value of the energy that cannot reverse flow and the measured value of the amount of energy used, and then based on the measured value of the intermediate value and the energy that allows reverse flow. The final reverse flow rate is calculated. In this way, energy that cannot flow backward and energy that can flow backward are separately and stepwise contributed to the processing, so that even when these energies are mixed, the energy can be appropriately processed. In addition, according to the monitoring system, the first generation amount measuring means for measuring the energy capable of reverse flow as the measurement means, the second generation amount measuring means for measuring the energy that cannot reverse flow, and the usage amount for measuring the energy used. By using only the three measuring means of the measuring means, it is possible to accurately calculate the amount of energy that can be finally reversely flowed out from the building, and the cost of the entire system can be reduced.

(2) Further, the intermediate value calculating means includes:
Determination means for determining whether or not a value obtained by subtracting the second generation amount measurement value from the usage amount measurement value is 0 or more;
An authorization means for authorizing the value as an intermediate value when the value is 0 or more, and authorizing the intermediate value as 0 when the difference is less than 0;
It is preferable to provide.
According to this, when the amount of energy used is less than the generated reverse flow impossible energy, the process of setting the intermediate value to 0 is performed, thereby simplifying the calculation procedure of the reverse flow final value. Can do.

(3) Further, the final value calculating means includes:
Determination means for determining whether or not a value obtained by subtracting the intermediate value from the first generation amount measurement value is 0 or more;
It is preferable to provide a recognition unit that recognizes the value as a final value when the value is 0 or more, and recognizes the final value as 0 when the difference is smaller than 0.
According to this, when the amount of energy that can be reverse-flowed is below the intermediate value, the final value is recognized as 0, thereby generating energy as if there is power to be purchased from the power company. Even when the energy obtained from the facility is insufficient, the amount of energy to be paid out can be accurately calculated.

(4) Further, the reverse flow rate calculation means includes:
A time measuring means for measuring a unit time specified in advance;
Instructing means for instructing the creation of the final reverse flow rate every unit time measured by the time measuring means,
Accumulating means for accumulating the reverse power flow calculation value created every unit time;
It is preferable to provide.

  According to this, it becomes possible to measure the reverse flow rate per unit time, and in a state where the reverse flow rate measured every unit time is accumulated, for example, every day, every week, every month, etc. The reverse tide flow rate in a specific period formed by accumulating the unit time can be presented.

  According to the energy monitoring system of the present invention, it is possible to appropriately calculate the amount of energy finally flowing backward from the building even when the energy that can flow backward and the energy that cannot flow backward are mixed. it can.

It is a distribution diagram showing the whole energy monitoring system composition concerning one embodiment of the present invention. It is a block diagram showing the whole structure of the energy monitoring system which concerns on embodiment of FIG. It is a flowchart which shows the calculation procedure of the electric power consumption instantaneous value in the usage-amount calculation means of the energy monitoring system which concerns on embodiment of FIG. It is a block diagram which shows the total means of the reverse tide flow rate calculation means of the energy monitoring system which concerns on embodiment of FIG.

Hereinafter, the form for implementing the energy monitoring system concerning the present invention to a detached house is explained in detail with reference to Drawing 1-Drawing 3. FIG.
FIG. 1 is a diagram showing an electric power system diagram in a detached house added with an energy monitoring system according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a commercial AC power source that exchanges power with an electric power company, 2 Is a distribution board to which a commercial AC power supply 1 is connected, 3 is a solar power generation device, and 4 is a gas cogeneration device.
One end of a single-phase three-wire trunk line extending from the distribution board 2 is connected to the commercial AC power source 1, whereby electric power is supplied from the power company and a part of the electric power generated in the detached house is reversely flowed. The
In the distribution board 2, the main breaker 5 connected to the commercial AC power source 1 is connected to the main breaker 5 connected to the other end of the main line, and the power supply system from the solar power generator 3, and the main breaker 5 In addition, a solar power generation breaker 6 connected by a single-phase three-wire and a gas cogeneration breaker 7 installed in a power supply system from the gas cogeneration device 4 and also connected to the main breaker 5 by a single-phase three-wire. Is provided. A branch line is connected to the main breaker 5 and connected to an outlet in each room via an individual breaker 8. Therefore, the electric power supplied from the commercial AC power source 1, the electric power obtained from the solar power generation device 3, and the electric power obtained from the gas cogeneration device 4 are all sent to each individual breaker 8 via the main breaker 5, It is configured to be supplied to an outlet in each room.

  The solar power generation device 3 includes a solar power collection (solar cell) panel 3a installed on the roof of a building, and a power conditioner 3b having a conversion unit that converts direct current generated power from the solar heat collection panel 3a into alternating current. The power conditioner 3b is connected to the solar power generation breaker 6 installed in the distribution board 2 by a single-phase three-wire, and the electricity generated by the solar power generation device 3 is solar power. The photovoltaic power generation breaker 6 is led to the outlet of each room through the main breaker 5 and the like. In addition, the power generated by the solar power generation device 3 is reversely flowed, and when there is a surplus, the power is sent from the main breaker 5 to the power company via the commercial AC power source 1. Therefore, the solar power generation device 3 corresponds to an energy generation facility that generates energy that can be paid out from a detached house.

  The gas cogeneration apparatus 4 is installed in the vicinity of a detached house, and includes a gas engine power generation unit 4a that uses city gas, LP gas, or other gas as fuel, and cooling heat for the engine of the power generation unit 4a. And a hot water supply / heating unit 4b including a hot water storage tank for storing hot water generated by using exhaust heat. The power generation unit 4a is connected to the gas cogeneration breaker 7 installed in the distribution board 2 by itself. Electricity generated by the gas cogeneration device 4 is connected by the phase 3 wire, and is configured to be led from the gas cogeneration breaker 7 to the outlet of each room through the main breaker 5 and the like. Examples of such a gas cogeneration device 4 include Osaka Gas's Eco-Will (registered trademark). The power generated by the gas cogeneration device 4 is not subjected to reverse power flow because of an agreement or the like, and a reverse power flow prevention device (not shown) or the like is appropriately attached. Therefore, the gas cogeneration apparatus 4 corresponds to an energy generation facility that generates energy that cannot be paid out from a detached house.

As can be seen from the system diagram of FIG. 1 and the block diagram of FIG. 2, the energy monitoring system according to the present embodiment is generated by the solar power generation device 3 that is an energy generation facility that generates energy that can be paid out from a detached house. A first measuring instrument 10 (first generation amount measuring means) that is a photovoltaic power measuring instrument that can measure the generated power and a gas cogeneration device 4 that is an energy generation facility that generates energy that cannot be paid out from a detached house. A second measuring instrument 11 (second generation amount measuring means) that is a gas cogeneration power generation measuring instrument capable of measuring the generated power, and a power usage measuring instrument 12 that can measure the power used in a detached house ( Usage amount measuring means), and current and voltage values obtained from the first measuring instrument 10, the second measuring instrument 11, and the power usage measuring instrument 12. The reverse flow rate calculation device 13 (reverse flow rate calculation means) comprising a computer or the like for calculating the amount of power that flows backward from the detached house to the power company, and the reverse flow rate energy obtained by the reverse flow rate calculation device 13 The display device 14 for displaying is provided, and the reverse flow rate calculation device 13 is connected to the server 15 via the Internet or the like.
In addition, although each of the measuring instruments 10 to 12 can adopt a known measuring instrument as appropriate, in this embodiment, a current sensor that measures current, a voltage sensor that measures voltage, and a current value by each sensor A configuration is adopted in which the amount of power is measured by adding a power factor to the voltage value.

The first measuring instrument 10 is attached to a single-phase three-wire connecting the photovoltaic power generation breaker 6 and the power conditioner 3b, and flows through the single-phase three-wire from the power conditioner 3b to the solar power generation breaker 6. The current value and voltage value of the current can be measured by sampling every certain second (for example, 4 seconds) as a unit period.
The second measuring instrument 11 is attached to a single-phase three-wire connecting the gas cogeneration breaker 7 and the main breaker 5, and a current flowing through the single-phase three-wire from the gas engine power generation unit 4a to the gas cogeneration breaker 7. The value and the voltage value can be sampled and measured every certain second (for example, 4 seconds).
The power usage meter 12 is attached to a single-phase three-wire main line from the main breaker 5 to the individual breaker 8, and the current value and voltage value of the current sent from the main breaker 5 to each individual breaker 8, That is, it includes power generated by solar power generation and gas cogeneration power generation, and measures the current value and voltage value of the current that will be consumed from the outlets of each room by sampling every certain seconds (for example, 4 seconds) can do.

Each of the measuring instruments 10 to 12 samples and measures the current value and voltage value of the current flowing through the single-phase three-wires every predetermined second (for example, 4 seconds), and measures the electric energy of the unit period as an instantaneous value. . The instantaneous value indicates the power (W) measured (measured) by the measuring instrument in the unit period set as 1 second to several seconds as described above, and measured at any instant of the unit period. It is possible to obtain the amount of power by multiplying the power to be multiplied by the time of the unit period, or it is possible to obtain it by accumulating the power in the minute period from the beginning to the end of the unit period It is.
As can be seen from the block diagram of FIG. 2, the detection signals of the measuring instruments 10-12 are transmitted to the receiving means 16b of the communication control means 16 attached to the measuring instruments 10-12, and the reverse flow from the receiving means 16b. It is configured to be taken into the amount calculation device (usage amount calculation means) 13.

The reverse power flow rate calculation device 13 calculates the amount of electric power to be finally discharged from the house based on the measurement values (current value and voltage value) from the measuring instruments 10 to 12, and each measurement Recognized by each measuring instrument measurement value recognition means 17a, 17b, 17c, and each measuring instrument measurement value recognition means 17a, 17b, 17c, respectively, for recognizing the measurement value as the electric energy (Wh) based on the measurement of the devices 10-12 The measured value storage means 18b, 18c for storing the measured values, and the measured values stored in the measured value storage means 18a, 18b, 18c are used by the computing means 19a, the judging means 19b, and the certifying means 19c. Based on the intermediate value calculation means 19 for calculating the tidal current intermediate value, the intermediate value obtained from the intermediate value calculation means 19 and the measurement value from the first measuring instrument 10 stored in the measurement value storage means 18a. Means 20a, are provided with the final value calculating means 20 for calculating the backward flow final value by the certification unit 20c and judgment means 20b.
Note that storage means (not shown) is connected to the calculation means 19 and 20 in order to use the accumulated data at the time of calculation processing or to accumulate the acquired data.

Here, with reference to the flowchart of FIG. 3, the process sequence which calculates a reverse power flow final value from an electric power generation amount measured value is demonstrated.
The amount of electric power sent from each measuring instrument measurement value recognizing means 17a, 17b, 17c, that is, the amount of electric power capable of reverse flow obtained from the measured value from the first measuring instrument 10 (hereinafter referred to as "first electric energy"). ), The amount of electric power obtained from the measurement value from the gas power generation measuring instrument 11 and the reverse power flow impossible (hereinafter referred to as “second electric energy”), the electric power used from the measurement value from the electric power consumption measuring instrument 12 The quantity is stored and accumulated in each measured value storage means 18a, 18b, 18c.
First, in the intermediate value calculation means 19, the power consumption obtained from the measurement value from the power consumption meter 12 is taken out from the measurement value storage means 18 c and the inverse obtained from the measurement value from the gas generation power meter 11. The amount of electric power that cannot be flowed (hereinafter referred to as “second electric energy”) is taken out from the measured value storage means 18b, the second electric energy is subtracted from the used electric energy by the arithmetic means 19a, and the result is set to A value (step S1). Then, the judging means 19b judges whether or not the A value is greater than or equal to zero (step S2). If it is less than zero, the authorizing means 19c recognizes the A ′ value as zero (step S3). On the other hand, if the determination means 19b determines that the A value is greater than or equal to zero in step S2, the recognition means 19c recognizes the A value as the A ′ value (step S4).
Next, in the final value calculation means 20, the amount of power that can be reversely flowed (hereinafter referred to as the first power amount) obtained from the measurement value from the first measuring instrument 10 is taken out from the measurement value storage means 18a, and is calculated by the calculation means 20a. As a value obtained by subtracting the A ′ value from one electric energy, a reverse flow electric energy intermediate value B ′ per unit time is calculated (step S5).
Next, the determining means 20b of the final value calculating means 20 determines whether or not the reverse flow power amount intermediate value B ′ is equal to or greater than zero (step S6). Is determined to be zero (step S7), B = B 'is set (step S8), and a reverse flow power final value B is obtained (step 9). On the other hand, if it is determined in step S6 that the B ′ value is greater than or equal to zero, in step 8, the B ′ value is set to the B value, and the reverse flow power amount final value B is obtained.

That is, when the second power amount that cannot reverse flow is larger than the used power amount, all of the first power amount becomes the reverse power amount B. In this case, the amount of power purchased from the power company is zero.
On the other hand, when the second power amount incapable of reverse flow is smaller than the used power amount, the balance of power amount A obtained by subtracting the second power amount incapable of reverse flow from the used power amount is considered. When the first electric energy is used, all of the electric energy supplied from the electric power company is used. However, when the first electric energy is viewed from the first electric energy, There is no amount of power purchased from an electric power company, and the amount of power that can be reversely flowed from the first amount of power is obtained. Therefore, when the subtracted power consumption A is smaller than the first power amount, that is, when B ′ is positive, the purchased power amount is zero, and B ′ which is the surplus power amount in the first power amount is The reverse power flow amount B is obtained. Thus, using only the measurement values from the three sets of measuring instruments 10 to 12, both the solar power generation device that generates power that can be reversely flowed and the gas cogeneration device that generates power that cannot be reversely flown Even in a complicated power supply system including the power amount, the amount of power that can be reversely flowed can be easily and highly reliably acquired.

Further, a display device 14 is further connected to the reverse flow rate calculation device 13 via an output control means 21 and a display control means 22, and input means (not shown) are the reverse flow rate calculation device 13 and the output control means 21. It is connected to the. And a user inputs required information via an input means, changes it, and the reverse tide flow rate calculation apparatus 13 displays the reverse tide electric power amount on the display apparatus 14 by the input by the said user. By viewing the display, the user can determine whether or not the amount of reverse power flow in the home is appropriately changing, which can be used for energy saving. Further, in some cases, the power consumption data obtained by the calculation is transmitted to the server 15 having a living energy reduction support system (a system disclosed in Japanese Patent Application Laid-Open No. 2007-257284 of the present applicant) through the Internet line. It can be automatically sent and energy consumption trends at home can be compared with subscribers to the support system.
Moreover, the information input by the input means is processed by the output control means 21 as necessary, and transmitted to the measuring instruments 10 to 12 via the transmission means 16a. Thereby, the setting of each measuring instrument etc. can be changed.

  Further, as shown in FIG. 4, the reverse tide flow rate calculation device 13 includes a time measuring means 23a for measuring a unit time specified in advance, and a final reverse tide flow rate final value for each unit time measured by the time measuring means 23a. A totaling means 23 comprising an instruction means 23b for instructing, an accumulating means 23c for accumulating a reverse power flow calculation value created every unit time, and a period setting means 23d for determining an accumulation period by the accumulating means, not shown By starting the counting means 23 by the input means, one hour, one day, one week, one month, one year set by the period setting means 23d or an arbitrary period intended by the user (generically specifying them) It is possible to calculate the reverse tidal flow during the period.

  As described above, in the present embodiment, the intermediate value is calculated based on the measured value of the energy that cannot be reversely flown and the measured value of the energy consumption, and then the intermediate value and the measured value of the energy that can be reversely flown The final reverse flow rate is calculated based on In this way, energy that cannot flow backward and energy that can flow backward are separately and stepwise contributed to the processing, so that even when these energies are mixed, the energy can be appropriately processed. In addition, according to the monitoring system, the first measuring instrument 10 (first generation amount measuring means) that measures the energy that can be reversely flowed as the measuring means, and the second measuring instrument 11 (second second) that measures the energy that cannot be reversely flown. The amount of energy that can be reversely flowed finally from the building can be accurately determined by using only the three measuring means of the production amount measuring means) and the usage meter 12 (usage measuring means) for measuring the energy used. In particular, it is possible to calculate the amount of power that can be reversely flowed without measuring the amount of power purchased from an electric power company, so that the cost of the entire system can be significantly reduced.

The present invention has been described based on the specific embodiments. However, the present invention is not limited to the above embodiments, and various modifications assumed by those skilled in the art are possible. For example, in the above-described embodiment, the solar power generation device 3 and the gas cogeneration device 4 are considered as the power generation facilities, but the same can be implemented even when other types of power generation facilities are installed. For example, a fuel cell cogeneration device, a wind power cogeneration device, a hydraulic cogeneration device, a geothermal cogeneration device, and the like.
Moreover, although the typical electric power consumption was considered as energy usage, if the environment permits, it can be applied to other energy such as gas and water.

1 Commercial AC power supply 2 Distribution board 3 Photovoltaic power generation equipment (energy generation equipment that generates disbursable energy)
3a Solar heat collecting panel 3b Power conditioner 4 Gas cogeneration system (energy generation facility that generates energy that cannot be dispensed)
4a Gas engine power generation unit 4b Hot water supply / heating unit 5 Main breaker 6 Solar power generation breaker 7 Gas cogeneration breaker 8 Individual breaker 10 First measuring instrument (first generation amount measuring means)
11 Second measuring instrument (second generation amount measuring means)
12 Usage meter (Usage meter)
13 Reverse tide flow rate calculation device (reverse tide flow rate calculation means)
14 Display device 15 Server 16 Communication control means 16a Transmitting means 16b Receiving means 17a, b, c Measuring instrument value recognition means 18a, b, c Each measured value storage means 19 Intermediate value calculating means 19a Computing means 19b Judging means 19c Means 20 Final value calculation means 20a Calculation means 20b Determination means 20c Authorization means 21 Output control means 22 Display control means 23 Counting means 23a Timekeeping means 23b Instruction means 23c Accumulating means 23d Period setting means

Claims (4)

First generation amount measuring means for measuring the amount of energy generated by the energy generation facility provided in the building and capable of reverse flow;
Second generation amount measuring means for measuring the amount of energy generated by the energy generation facility provided in the building and incapable of reverse power flow;
Usage measurement means for measuring the amount of energy used in the building;
A reverse tide flow rate calculating means for calculating an amount of energy to be finally discharged from the building based on the measured values obtained from the first generated amount measuring means, the second generated amount measuring means, and the usage amount measuring means;
The reverse tide flow rate calculating means comprises
Intermediate value calculating means for calculating a reverse power flow intermediate value based on the used amount measurement value and the second generation amount measurement value;
A final value calculating means for calculating a reverse power flow final value based on the intermediate value and the first generation amount measurement value;
An energy monitoring system characterized by comprising: The intermediate value calculating means includes
Determination means for determining whether or not a value obtained by subtracting the second generation amount measurement value from the usage amount measurement value is 0 or more;
An authorization means for authorizing the value as an intermediate value when the value is 0 or more, and authorizing the intermediate value as 0 when the difference is less than 0;
The energy monitoring system according to claim 1, comprising: The final value calculating means includes
Determination means for determining whether or not a value obtained by subtracting the intermediate value from the first generation amount measurement value is 0 or more;
3. An authenticating unit that recognizes the value as a final value when the value is 0 or more, and recognizes the final value as 0 when the difference is smaller than 0. The energy monitoring system described in 1. The reverse tide flow rate calculating means includes:
A time measuring means for measuring a unit time specified in advance;
Instructing means for instructing the creation of the final reverse flow rate every unit time measured by the time measuring means,
Accumulating means for accumulating the reverse power flow calculation value created every unit time;
The energy monitoring system according to any one of claims 1 to 3, further comprising:

Images