JP2020182311A - Abnormality detection system and abnormality detection method - Google Patents

Abstract

To enable detection of an abnormality in a smart meter and a distributed power source.SOLUTION: An abnormality detection system 1 includes a smart meter 10 that measures power at a receiving point from a power system 22, an ammeter 44 that measures a current flowing through the receiving point independently of the smart meter 10, a power generation unit 50 that converts other energy into electrical energy to generate electricity, a voltmeter 52 that measures a line voltage of a wiring that connects the power generation unit 50 and the receiving point, a power extraction unit 64 that derives the power at the receiving point on the basis of a current value of the ammeter 44 and a voltage value of the voltmeter 52, and a comparison unit 66 that determines whether the power at the receiving point measured by the smart meter 10 is equal to the power at the receiving point derived by the power extraction unit 64.SELECTED DRAWING: Figure 1

Description

The present invention relates to an abnormality detection system and an abnormality detection method for detecting an abnormality in a smart meter or a distributed power source.

A smart meter that measures the power at the receiving point from the power system may be installed on the premises of the customer (hereinafter, simply referred to as the customer). In addition, the consumer may be provided with a distributed power source that is connected to the power system and supplies electric power to the load in the consumer (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-075895

If an abnormality occurs in the smart meter, it may not be possible to accurately measure the power with the smart meter. If this happens, the management server will not be able to obtain accurate power from the smart meter, and as a result, it may derive incorrect electricity charges. In addition, if an abnormality occurs in the distributed power source, the generated power may not be properly controlled. As a result, reverse power flow from the distributed power source to the power system may occur unintentionally. Therefore, when an abnormality occurs in the smart meter or the distributed power source, it is necessary to detect the abnormality at an early stage and deal with the abnormality.

In view of such problems, an object of the present invention is to provide an abnormality detection system and an abnormality detection method capable of detecting an abnormality of a smart meter or a distributed power source.

In order to solve the above problems, the abnormality detection system of the present invention includes a smart meter that measures the power at the power receiving point from the power system and a current meter that measures the current flowing through the power receiving point independently of the smart meter. , A power generation unit that converts other energy into electrical energy to generate electricity, a voltmeter that measures the line voltage of the wiring that connects the power generation unit and the power receiving point, and the current value of the current meter and the voltage of the voltmeter. A power derivation unit that derives power at the power receiving point based on the value, and a comparison unit that determines whether the power at the power receiving point measured by the smart meter and the power at the power receiving point derived by the power derivation unit are equal. And.

Further, the abnormality detection system may further include a power generation control unit that stops power generation by the power generation unit when the power at the power receiving point measured by the smart meter and the power at the power receiving point derived by the power extraction unit are different. Good.

In order to solve the above problems, the abnormality detection method of the present invention includes a power measurement step of measuring the power at the power receiving point from the power system with a smart meter and a current flowing through the power receiving point measured independently of the smart meter. Power derivation that derives power at the power receiving point based on the current value of and the voltage value of the line voltage of the wiring that connects the power generation unit that generates electricity by converting other energy into electrical energy and the power receiving point. It has a step and a comparison step for determining whether or not the power at the power receiving point measured by the smart meter and the power at the power receiving point derived in the power derivation step are equal.

According to the present invention, it is possible to detect an abnormality in a smart meter or a distributed power source.

It is the schematic which shows the structure of the abnormality detection system by this embodiment. It is a flowchart explaining the operation flow of a control part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, other specific numerical values, etc. shown in the embodiment are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate description, and elements not directly related to the present invention are not shown. To do.

FIG. 1 is a schematic view showing the configuration of the abnormality detection system 1 according to the present embodiment. In FIG. 1, the flow of the control signal is indicated by a broken line arrow.

The anomaly detection system 1 includes a smart meter 10, a management server 12, a distribution board 14, a load 16, a distributed power source 18, and a remote controller 20.

The smart meter 10 is connected to the power system 22 and is installed at a power receiving point from the power system 22 in the consumer. The power receiving point indicates the boundary between the consumer and the power system 22. The smart meter 10 includes a measuring unit 30, a communication unit 32, and a service breaker 34. In FIG. 1, the service breaker 34 is referred to as SB.

The measuring unit 30 uses the current flowing through the receiving point, the voltage applied to the receiving point, the power factor derived from the phase difference between the current and the voltage at the receiving point, the power at the receiving point (power passing through the receiving point), and the receiving point. The electric energy (kWh) for a predetermined time (for example, 30 minutes) is measured. The measured power and the like may be stored in association with the measured time. The measuring unit 30 may measure the power of the forward power flow at the power receiving point as a positive value and the power of the reverse power flow at the power receiving point as a negative value. The forward power flow means that the electric power is supplied from the electric power system 22 to the consumer side, and the reverse power flow means that the electric power is supplied from the consumer side to the electric power system 22.

The communication unit 32 establishes communication (wireless communication or wired communication) with the outside, and provides internal information such as the measurement result of the measurement unit 30 (for example, electric power, electric energy measurement time, electric energy, electric energy measurement time, etc.). It can be sent to the outside. For example, the communication unit 32 transmits internal information to the management server 12 by transferring in a multi-hop format through another smart meter 10 or a repeater. Further, the communication unit 32 may transmit internal information to the management server 12 through the wireless communication network of the communication carrier.

Further, the communication unit 32 establishes communication (wireless communication or wired communication) with the distributed power source 18, and provides internal information (for example, electric power, electric energy measurement time, electric energy, electric energy measurement time, etc.) to the distributed power source 18. ) Can also be sent. For example, the communication unit 32 may transmit internal information to the distributed power source 18 via a wireless LAN.

The management server 12 is installed by the administrator of the power system 22. The management server 12 derives, for example, the electricity charges to be charged to the consumer by using the internal information of the smart meter 10 collected for each consumer.

The service breaker 34 is cut off when a current exceeding the contract current capacity flows. The function of the service breaker 34 may be provided on the distribution board 14.

The distribution board 14 is installed indoors of the customer and is connected to the smart meter 10. The distribution board 14 includes an earth leakage breaker 40, a plurality of branch breakers 42a and 42b, and an ammeter 44. In FIG. 1, the earth leakage breaker 40 is referred to as ELB.

The earth leakage breaker 40 is connected to the service breaker 34 of the smart meter 10. The earth leakage breaker 40 is shut off when an earth leakage occurs. A plurality of branch breakers 42a and 42b are connected to the earth leakage breaker 40. Hereinafter, the plurality of branch breakers 42a and 42b may be generically referred to as a branch breaker 42. The number of branch breakers 42 connected to the earth leakage breaker 40 is not limited to two, and may be one or three or more.

Of the plurality of branch breakers 42, for example, the load 16 is connected to the branch breaker 42a. The power system 22 can supply power to the load 16 through the distribution board 14. Further, among the plurality of branch breakers 42, for example, the distributed power source 18 is connected to the branch breaker 42b.

The ammeter 44 is provided in the distribution board 14 in the current path between the service breaker 34 and the earth leakage breaker 40. Specifically, the ammeter 44 is an instrument transformer (CT). The ammeter 44 measures the current flowing through the receiving point independently of the smart meter 10. The current value measured by the ammeter 44 may be stored in the control unit 56 in association with the measured time.

The distributed power source 18 is, for example, a fuel cell that generates electricity in a consumer. The distributed power source 18 is not limited to a fuel cell, but may be a renewable energy power generation facility such as a solar power generator, a wind power generator, a hydroelectric power generator, a geothermal power generator, a solar heat generator, or an atmospheric heat generator. It may be an internal combustion power generator, a storage battery, or the like.

The distributed power source 18 includes a power generation unit 50, a voltmeter 52, a communication unit 54, a control unit 56, and a notification unit 58.

The power generation unit 50 is configured independently of the power system 22. The power generation unit 50 is composed of, for example, a fuel cell or the like, and converts other energy (energy other than electric energy) into electric energy to generate electricity (power generation).

The power generation unit 50 is connected to a power receiving point (smart meter 10) through a distribution board 14 by, for example, a single-phase three-wire system wiring. That is, in FIG. 1, the wiring is shown as a single wire, but in reality, the power generation unit 50 is composed of a plurality of electric wires (for example, a set of electric wires composed of two voltage lines and one neutral wire). Connected to the receiving point. Further, the power generation unit 50 can be connected to the load 16 through the distribution board 14, and the generated power can be supplied to the load 16.

The voltmeter 52 measures the line voltage (for example, the voltage between two voltage lines) of the wiring connecting the power generation unit 50 and the power receiving point. The voltage value measured by the voltmeter 52 may be stored in the control unit 56 in association with the measured time.

The communication unit 54 can establish communication (wireless communication or wired communication) with the outside and at least receive information. The communication unit 54 establishes communication with the communication unit 32 of the smart meter 10, for example, and receives the internal information of the smart meter 10. Specifically, the communication unit 54 can receive the electric power at the power receiving point measured by the smart meter 10 and the electric energy for a predetermined time. Further, the communication unit 54 may receive the electric power at the receiving point and the electric energy for a predetermined time through the management server 12.

The control unit 56 is composed of a semiconductor integrated circuit including a central processing unit (CPU), a ROM in which a program or the like is stored, a RAM as a work area, or the like. By executing the program, the control unit 56 functions as a power generation control unit 60, an acquisition unit 62, a power extraction unit 64, and a comparison unit 66.

The acquisition unit 62 acquires the electric power at the power receiving point measured by the smart meter 10 and the measurement time of the electric power through the communication unit 54 every predetermined control cycle (for example, every minute). Hereinafter, the power at the power receiving point measured by the smart meter 10 may be referred to as meter-side power.

Further, the acquisition unit 62 acquires the current value from the ammeter 44 and acquires the current value from the voltmeter 52 at a predetermined sampling cycle. The acquisition unit 62 acquires the current value and the voltage value at substantially the same timing. The sampling cycle is set, for example, to be equal to or lower than the meter-side power acquisition cycle. The acquisition unit 62 temporarily stores the acquired current value and voltage value in association with the acquired time.

When the meter-side power is acquired by the acquisition unit 62, the power-leading unit 64 collects the current value sampled at approximately the same time as the measurement time of the acquired meter-side power (the time closest to the measurement time of the meter-side power). And the voltage value is read from the acquisition unit 62. The power derivation unit 64 derives the power (instantaneous value) at the time when the current value and the voltage value are sampled based on the read current value and the voltage value. The derived power corresponds to the power at the receiving point. Hereinafter, the electric power at the receiving point derived by the electric power extraction unit 64 may be referred to as the distributed power source side electric power.

The power extraction unit 64 may integrate the derived power for a predetermined time (for example, 30 minutes) and derive the electric energy (kWh) for the predetermined time at the power receiving point.

The power generation control unit 60 controls the power generation unit 50 based on the current value of the ammeter 44, the voltage value of the voltmeter 52, the electric power derived by the power extraction unit 64, and the like.

The comparison unit 66 is a distributed power source side power derived based on the meter side power and the current value and voltage value sampled at the time closest to the meter side power measurement time (approximately the same as the meter side power measurement time). Judge whether or not the time is equal to the distributed power supply side power). For example, the comparison unit 66 derives the difference between the meter-side power and the distributed power source-side power at approximately the same time as the meter-side power measurement time. The comparison unit 66 determines that the meter-side power and the distributed power supply-side power are equal if the difference is within a predetermined range including zero. The predetermined range is set in consideration of measurement errors in each of the smart meter 10, the ammeter 44, and the voltmeter 52, for example.

When the meter side power and the distributed power supply side power are equal, the smart meter 10 and the distributed power supply 18 can be regarded as functioning normally. On the other hand, when the power on the meter side and the power on the distributed power source side are different, it can be considered that an abnormality has occurred in the smart meter 10 or the distributed power source 18. That is, the comparison unit 66 detects whether or not an abnormality has occurred in the smart meter 10 or the distributed power source 18 by determining whether or not the meter side power and the distributed power source side power are equal.

The comparison unit 66 may determine whether or not the electric energy at the power receiving point measured by the smart meter 10 is equal to the electric energy at the power receiving point derived at the time when the electric energy is measured. ..

When the power on the meter side and the power on the distributed power source side are different, the notification unit 58 notifies that an abnormality has occurred. The notification unit 58 may be a speaker or the like that emits an alarm sound, or may be an alarm lamp or the like that notifies an abnormality by lighting or blinking. As a result, the consumer can be made aware that an abnormality has occurred in the smart meter 10 or the distributed power source 18.

The remote controller 20 is installed indoors, for example. The remote controller 20 can exchange information with the control unit 56 of the distributed power source 18. The remote controller 20 has an input function for receiving input operations such as various setting values instructed to the distributed power source 18, and an output function for displaying the state of the distributed power source 18 on the display.

When the meter side power and the distributed power supply side power are different, the comparison unit 66 may display on the display of the remote controller 20 that an abnormality has occurred. As a result, the consumer can be made aware that an abnormality has occurred in the smart meter 10 or the distributed power source 18.

Further, when the power on the meter side and the power on the distributed power source side are different, there is a possibility that an abnormality has occurred in the distributed power source 18, so that the power generation control unit 60 may stop the power generation by the power generation unit 50. As a result, it is possible to prevent each part of the distributed power source 18 and the load from being damaged by the abnormal generated power of the power generation unit 50.

Further, when the power on the meter side and the power on the distributed power source side are different, the comparison unit 66 may notify the management server 12 that an abnormality has occurred. The management server 12 that has received the notification that the abnormality has occurred may arrange to send the meter reader of the smart meter 10 or the maintenance worker of the distributed power source 18 to the site. As a result, the smart meter 10 and the distributed power source 18 can be restored at an early stage.

FIG. 2 is a flowchart illustrating an operation flow of the control unit 56. The control unit 56 repeats the series of processes shown in FIG. 2 as interrupt control for a predetermined control cycle (for example, 1 minute).

First, in the smart meter 10, a power measurement step of measuring power at a power receiving point from the power system 22 is performed at predetermined time intervals.

When the predetermined control timing is reached, the acquisition unit 62 performs an acquisition step of acquiring the latest value of the power measured by the smart meter 10 (meter side power) and the measurement time of the meter side power through the communication unit 54 (S100). ..

Next, the power derivation unit 64 reads out the current value and the voltage value at the time closest to the measurement time of the meter side power among the current values and the voltage values acquired and stored in advance in the predetermined sampling cycle (S110). Next, the power derivation unit 64 performs a power derivation step of deriving the power (distributed power source side power) at the receiving point based on the read current value and voltage value (S120).

Next, the comparison unit 66 performs a comparison step of determining whether or not the acquired meter-side power and the derived distributed power supply-side power are equal (S130). Specifically, the comparison unit 66 determines that the meter side power and the distributed power source side power are equal when the difference between the meter side power and the distributed power source side power is within a predetermined range including zero.

When the power on the meter side and the power on the distributed power source side are equal (YES in S130), the comparison unit 66 considers that the smart meter 10 and the distributed power source 18 are normal, and ends a series of processes.

When the power on the meter side and the power on the distributed power source side are not equal to (different) (NO in S130), the comparison unit 66 considers that an abnormality has occurred in the smart meter 10 or the distributed power source 18 and notifies that the abnormality has occurred. A notification step is performed to notify the unit 58 (S140). Further, the comparison unit 66 may display the fact that an abnormality has occurred on the display of the remote controller 20, or may notify the management server 12.

Then, the power generation control unit 60 performs a power generation stop step of stopping the power generation by the power generation unit 50 (S150), and ends a series of processes.

As described above, in the abnormality detection system 1 of the present embodiment, it is determined whether or not the meter side power and the distributed power source side power are equal. Therefore, according to the abnormality detection system 1 of the present embodiment, it is possible to detect an abnormality of the smart meter 10 or the distributed power source 18.

The abnormality detection system 1 of the present embodiment detects not only abnormalities of the smart meter 10 and the distributed power source 18, but also fraudulent acts on the smart meter 10 and the distributed power source 18 (for example, falsification of the amount of power received). You can also.

Further, in the abnormality detection system 1 of the present embodiment, the meter side power and the distributed power supply side power are compared in the distributed power supply 18. However, the comparison between the meter-side power and the distributed power supply-side power may be performed by the smart meter 10. For example, the smart meter 10 may acquire the distributed power source side power derived by the power extraction unit 64 through the communication unit 32 and compare the meter side power with the distributed power source side power. Further, the comparison between the meter side power and the distributed power source side power may be performed by the management server 12. For example, the management server 12 may acquire the meter-side power from the smart meter 10 and the distributed power supply-side power from the distributed power source 18, and compare the meter-side power with the distributed power supply-side power.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such embodiments. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, which naturally belong to the technical scope of the present invention. Understood.

The present invention can be used in anomaly detection systems and anomaly detection methods.

1 Anomaly detection system 10 Smart meter 22 Power system 44 Ammeter 50 Power generation unit 52 Voltmeter 60 Power generation control unit 64 Power extraction unit 66 Comparison unit

Claims (3)

A smart meter that measures the power at the receiving point from the power system,
An ammeter that measures the current flowing through the power receiving point independently of the smart meter,
A power generation unit that converts other energy into electrical energy to generate electricity,
A voltmeter that measures the line voltage of the wiring that connects the power generation unit and the power receiving point,
A power extraction unit that derives power at the power receiving point based on the current value of the ammeter and the voltage value of the voltmeter.
A comparison unit for determining whether or not the power at the power receiving point measured by the smart meter is equal to the power at the power receiving point derived by the power extraction unit
Anomaly detection system equipped with. The first aspect of claim 1 further includes a power generation control unit that stops power generation by the power generation unit when the power at the power receiving point measured by the smart meter and the power at the power receiving point derived by the power extraction unit are different. The described anomaly detection system. A power measurement step that measures the power at the receiving point from the power system with a smart meter,
Between the current value of the current flowing through the power receiving point measured independently of the smart meter and the wiring line connecting the power generation unit that generates electricity by converting other energy into electrical energy and the power receiving point. A power derivation step for deriving power at the receiving point based on the voltage value of the voltage, and
A comparison step for determining whether or not the power at the power receiving point measured by the smart meter is equal to the power at the power receiving point derived in the power derivation step.
Anomaly detection method with.

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