JP7229089B2 - Anomaly detection system and anomaly detection method - Google Patents

Description

The present invention relates to an anomaly detection system and an anomaly detection method for detecting anomalies in smart meters or distributed power sources.

A customer's premises (hereinafter simply referred to as a customer) may be provided with a smart meter that measures power at a power receiving point from the power system. In addition, a consumer may be provided with a distributed power source that is connected to a power system and that supplies power to loads within the consumer (for example, Patent Literature 1).

JP 2014-075895 A

When an abnormality occurs in the smart meter, it may not be possible to accurately measure electric power with the smart meter. Then, the management server cannot obtain accurate power from the smart meter, and as a result, there is a risk of deriving an incorrect electricity bill. Moreover, when an abnormality occurs in a distributed power supply, it may become impossible to appropriately control the generated power. As a result, reverse power flow from the distributed power source to the power system may occur unintentionally. Therefore, when an abnormality occurs in a smart meter or a distributed power supply, it is necessary to detect the abnormality early and take action against the abnormality.

In view of such problems, an object of the present invention is to provide an anomaly detection system and an anomaly detection method capable of detecting anomalies in smart meters and distributed power sources.

In order to solve the above problems, the anomaly detection system of the present invention includes a smart meter that measures power at a power receiving point from a power system, and 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, the current value of the ammeter and the voltage of the voltmeter A power derivation unit that derives the 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 is equal to the power at the power receiving point derived by the power derivation unit. And prepare.

Further, the anomaly 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 reception point measured by the smart meter and the power at the power reception point derived by the power derivation unit are different. good.

In order to solve the above problems, the anomaly detection method of the present invention includes a power measurement step of measuring power at a power receiving point from a power system with a smart meter; and the voltage value of the line-to-line voltage of the wiring that connects the power receiving point and the power generation unit that converts other energy into electrical energy to generate electricity. and a comparison step of determining whether 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 deriving step.

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

1 is a schematic diagram showing the configuration of an anomaly detection system according to this embodiment; FIG. 4 is a flowchart for explaining the operation flow of a control unit;

Aspects of embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

FIG. 1 is a schematic diagram showing the configuration of an anomaly detection system 1 according to this embodiment. In FIG. 1, the flow of control signals is indicated by dashed arrows.

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

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

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

The communication unit 32 establishes communication (wireless communication or wired communication) with the outside, and transmits internal information such as measurement results of the measurement unit 30 (for example, power, power measurement time, power amount, power amount measurement time, etc.). Can be sent externally. For example, the communication unit 32 transmits the internal information to the management server 12 by transferring it in a multi-hop format through other smart meters 10, repeaters, and the like. Also, the communication unit 32 may transmit the internal information to the management server 12 through the wireless communication network of the communication carrier.

In addition, the communication unit 32 establishes communication (wireless communication or wired communication) with the distributed power sources 18, and transmits internal information (for example, power, power measurement time, power amount, power amount measurement time, etc.) to the distributed power sources 18. ) can also be sent. For example, the communication unit 32 may transmit the internal information to the distributed power supply 18 through the wireless LAN.

The management server 12 is installed by an administrator of the power system 22 . The management server 12 uses, for example, the internal information of the smart meter 10 collected for each consumer to derive the electricity rate to be billed to the consumer.

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

The distribution board 14 is installed indoors of the consumer and connected to the smart meter 10 . The distribution board 14 includes an earth leakage breaker 40 , a plurality of branch breakers 42 a and 42 b and an ammeter 44 . In addition, in FIG. 1, the earth leakage breaker 40 is written 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 cut off when an earth leakage occurs. A plurality of branch breakers 42 a and 42 b are connected to the earth leakage breaker 40 . Hereinafter, the plurality of branch breakers 42 a and 42 b may be collectively referred to as branch breaker 42 . The number of branch breakers 42 connected to earth leakage breaker 40 is not limited to two, and may be one or three or more.

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

Ammeter 44 is provided on a current path between service breaker 34 and earth leakage breaker 40 in distribution board 14 . The ammeter 44 is specifically a current transformer (CT). The ammeter 44 measures the current flowing through the power receiving point independently of the smart meter 10 . The current value measured by the ammeter 44 may be stored in the controller 56 in association with the measured time.

The distributed power source 18 is, for example, a fuel cell that generates power at the consumer. The distributed power supply 18 is not limited to a fuel cell, and may be a renewable energy power generation facility such as a solar power generator, a wind power generator, a hydraulic power generator, a geothermal power generator, a solar heat power generator, and an atmospheric heat power power generator. Alternatively, it may be an internal combustion power generator, a storage battery, or the like.

Distributed power supply 18 includes power generation unit 50 , voltmeter 52 , communication unit 54 , control unit 56 and notification unit 58 .

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

The power generation unit 50 is connected to a power receiving point (smart meter 10 ) through the distribution board 14 by, for example, single-phase three-wire wiring. In other words, although the wiring is shown as a single wire in FIG. Connected to the receiving point. Also, the power generation unit 50 can be connected to the load 16 through the distribution board 14 and can supply the generated power to the load 16 .

The voltmeter 52 measures the line-to-line voltage (for example, the voltage between two voltage lines) that connects the power generation unit 50 and the power receiving point. The voltage value measured by the voltmeter 52 may be stored in the controller 56 in association with the measured time.

The communication unit 54 can establish communication (wireless communication or wired communication) with the outside and receive at least information. The communication unit 54 establishes communication with, for example, the communication unit 32 of the smart meter 10 and receives internal information of the smart meter 10 . Specifically, the communication unit 54 can receive the power at the power receiving point measured by the smart meter 10 and the amount of power for a predetermined period of time. Further, the communication unit 54 may receive the power at the power receiving point and the power amount 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 storing programs and the like, a RAM as a work area, and the like. The control unit 56 functions as a power generation control unit 60, an acquisition unit 62, a power derivation unit 64, and a comparison unit 66 by executing programs.

The acquisition unit 62 acquires the power at the power receiving point measured by the smart meter 10 and the measurement time of the power through the communication unit 54 at each 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.

The acquisition unit 62 also acquires a current value from the ammeter 44 and a current value from the voltmeter 52 at a predetermined sampling cycle. Acquisition unit 62 acquires the current value and the voltage value at approximately the same timing. The sampling period is set, for example, equal to or less than the meter-side power acquisition period. 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 derivation unit 64 obtains the current value sampled at approximately the same time as the acquired meter-side power measurement time (the closest time to the meter-side power measurement time). and the voltage value are read out from the obtaining unit 62 . The power derivation unit 64 derives the power (instantaneous value) at the time when the current value and voltage value are sampled based on the read current value and voltage value. The derived power corresponds to power at the receiving point. Hereinafter, the power at the power receiving point derived by the power derivation unit 64 may be referred to as distributed power source side power.

Note that the power deriving unit 64 may integrate the derived power for a predetermined time period (for example, 30 minutes) to derive the power amount (kWh) for the predetermined time period 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 power derived by the power derivation unit 64, and the like.

The comparison unit 66 calculates the distributed power supply side power derived based on the meter side power and the current and voltage values sampled at the time closest to the meter side power measurement time (approximately the same as the meter side power measurement time). distributed power supply side power at time) are equal to each other. For example, the comparison unit 66 derives the difference between the meter-side power and the distributed power supply-side power at approximately the same time as the meter-side power measurement time. If the difference is within a predetermined range including zero, the comparison unit 66 determines that the meter-side power and the distributed power supply-side power are equal. The predetermined range is set, for example, in consideration of measurement errors in each of smart meter 10 , ammeter 44 and voltmeter 52 .

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 considered to be functioning normally. On the other hand, if the meter-side power and the distributed power supply-side power are different, it can be assumed that an abnormality has occurred in the smart meter 10 or the distributed power supply 18 . That is, the comparison unit 66 detects whether an abnormality has occurred in the smart meter 10 or the distributed power supply 18 by determining whether the meter-side power and the distributed power supply-side power are equal.

Note that the comparison unit 66 may determine whether the amount of power at the power receiving point measured by the smart meter 10 is equal to the amount of power at the power receiving point derived at the time when the power amount was measured. .

The notification unit 58 notifies that an abnormality has occurred when the power on the meter side and the power on the distributed power supply side are different. 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. This makes it possible for the consumer to recognize that the smart meter 10 or distributed power supply 18 has become abnormal.

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

The comparison unit 66 may cause the display of the remote controller 20 to indicate that an abnormality has occurred when the power on the meter side and the power on the distributed power supply side are different. This makes it possible for the consumer to recognize that the smart meter 10 or distributed power supply 18 has become abnormal.

If the meter-side power and the distributed power supply side power are different, the power generation control unit 60 may stop power generation by the power generation unit 50 because there is a possibility that an abnormality has occurred in the distributed power supply 18 . As a result, it is possible to prevent damage to each part and load of the distributed power supply 18 due to the abnormal power generated by the power generation unit 50 .

Further, when the meter-side power and the distributed power supply-side power 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 an abnormality has occurred may make arrangements to send a meter reader for the smart meter 10 or a maintenance worker for the distributed power supply 18 to the site. As a result, the smart meter 10 and distributed power supply 18 can be quickly restored.

FIG. 2 is a flowchart for explaining the operation flow of the control unit 56. As shown in FIG. The control unit 56 repeats the series of processes in FIG. 2 as interrupt control at a predetermined control period (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.

At a predetermined control timing, the acquisition unit 62 performs an acquisition step of acquiring the electric power (meter-side electric power) measured by the smart meter 10 and the latest measurement time of the meter-side electric power through the communication unit 54 (S100). .

Next, the power deriving unit 64 reads out the current value and the voltage value at the closest time to the meter-side power measurement time among the current and voltage values acquired and stored in advance at a predetermined sampling period (S110). Next, the power derivation unit 64 performs a power derivation step of deriving power (distributed power supply side power) at the power 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, when the difference between the meter-side power and the distributed power source-side power is within a predetermined range including zero, the comparison unit 66 determines that the meter-side power and the distributed power source-side power are equal.

If the meter-side power and the distributed power supply-side power are equal (YES in S130), the comparison unit 66 determines that the smart meter 10 and the distributed power supply 18 are normal, and terminates the series of processes.

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

Then, the power generation control unit 60 performs a power generation stop step for stopping power generation by the power generation unit 50 (S150), and ends the 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 supply-side power are equal. Therefore, according to the anomaly detection system 1 of the present embodiment, an anomaly of the smart meter 10 or the distributed power supply 18 can be detected.

Note that the anomaly detection system 1 of the present embodiment can detect not only an anomaly of the smart meter 10 and the distributed power supply 18 but also an illegality (for example, falsification of the amount of power received) to the smart meter 10 and the distributed power supply 18. can also

Further, in the anomaly detection system 1 of the present embodiment, the comparison between the meter-side power and the distributed power supply-side power is performed within 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 derivation unit 64 through the communication unit 32 and compare the meter side power and the distributed power source side power. Moreover, the comparison between the meter-side power and the distributed power supply-side power may be performed by the management server 12 . For example, the management server 12 may acquire meter-side power from the smart meter 10, acquire distributed power supply-side power from the distributed power supply 18, and compare the meter-side power and 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 obvious that a person skilled in the art can conceive of various modifications or modifications within the scope described in the claims, and these also belong to the technical scope of the present invention. Understood.

INDUSTRIAL APPLICABILITY The present invention can be used for an anomaly detection system and an anomaly detection method.

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

Claims (3)

A smart meter that measures power at a power 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 for measuring a line voltage of wiring connecting the power generation unit and the power receiving point;
a power derivation 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 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;
anomaly detection system. 2. The power generation control unit for stopping power generation by the power generation unit when the power at the power reception point measured by the smart meter and the power at the power reception point derived by the power derivation unit are different. An anomaly detection system as described. a power measurement step of measuring power at a power receiving point from the power system with a smart meter;
The current value of the current flowing through the power receiving point that is measured independently of the smart meter, and the line distance of the wiring that connects the power receiving point and a power generation unit that converts other energy into electrical energy to generate electricity a power derivation step of deriving power at the power receiving point based on the voltage value of the voltage;
a comparing step of determining whether 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 deriving step;
An anomaly detection method comprising:

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