KR101901316B1 - Sensor node for power distribution network - Google Patents

Abstract

According to an embodiment of the present invention, there is provided a sensor node disposed in a distribution facility, the sensor node comprising: a transmitter for transmitting a request signal in a broadcast manner; A receiver for receiving a response signal for the request signal from a plurality of gateways; A setting unit configured to set, as a connection gateway, a gateway that transmits a request signal having the largest signal strength among request signals received from the connectable gateway candidate that selects a gateway that has transmitted the response signal as a connectable gateway candidate; And a control unit for requesting communication setting information from the connection gateway and performing a registration procedure of the connection gateway using the received communication setting information.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a sensor node,

One embodiment of the invention relates to a power distribution network sensor node.

Since the IoT system applied to the power grid covers all of Korea, the number of gateways is not so small. In the case of urban areas, when a gateway and a sensor node are installed along a power line in a limited area, the gateway can be installed adjacent to the road have.

Therefore, it is inconvenient to input the communication configuration information such as the pairing of the gateway and the sensor node by the facility or operator at the beginning of the construction stage in which a large number of sensor nodes should be installed. Furthermore, in this process, the entire IoT network may incur a communication error with minor mistakes.

Sensor nodes and gateways to be applied to the power grid should be installed by applying the concept of D / L to the distribution lines. When sensor nodes and gateways are installed in different distribution lines, data analysis and additional data There is a limit to the provision of services

For example, assuming that different distribution lines are orthogonal to each other in the urban area, two gateways can be adjacent to each other at a narrow range. As a result, the sensor node installed in each distribution line connects to the sensor node itself It can be a problem to judge for yourself

 In order to avoid such a situation and to follow the original technical concept of the IoT system, the operator only needs to apply the initial power supply, and the sensor node himself or herself must query the gateway to set the frequency, communication mode, ID, etc. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power distribution network sensor node capable of automatically performing a registration procedure between a sensor node and a gateway installed in a distribution power network.

The present invention also provides a power distribution network sensor node capable of automatically performing a gateway and registration procedure installed in the same distribution network and preventing communication with a gateway installed in another distribution network.

In addition, the present invention provides a distribution network sensor node that can quickly perform registration with other gateways in the event of an error in a gateway, thereby preventing the spread of damage that may occur in distribution due to inability to communicate.

According to an embodiment of the present invention, there is provided a sensor node disposed in a distribution facility, the sensor node comprising: a transmitter for transmitting a request signal in a broadcast manner; A receiver for receiving a response signal for the request signal from a plurality of gateways; A setting unit configured to set, as a connection gateway, a gateway that transmits a request signal having the largest signal strength among request signals received from the connectable gateway candidate that selects a gateway that has transmitted the response signal as a connectable gateway candidate; And a control unit for requesting communication setting information from the connection gateway and performing a registration procedure of the connection gateway using the received communication setting information.

The transmitter may transmit request signals through channels 0 to 10, respectively.

The transmitter may transmit two request signals for each channel.

The transmitter may transmit a second request signal after waiting for 2000 to 3000 ms after transmitting the first request signal for each channel.

The communication setting information may include communication frequency information, spreading factor information, ID information, and wiring information.

The control unit may stop the registration procedure for the gateway when the gateway is installed in another distribution line using the wiring information.

The setting unit may set a gateway that has transmitted a request signal having the highest signal strength among the connectable gateway candidates excluding the gateway whose registration procedure is interrupted.

The transmitter may retransmit the request signal in a broadcast receiving mode.

If the control unit fails to receive information from the registered access gateway for a preset time, the control unit may control the transmitting unit to retransmit the request signal.

The sensor node of the present invention can automatically perform the registration procedure between the sensor node and the gateway installed in the power distribution network.

In addition, it is possible to automatically perform the gateway and registration procedure installed in the same ship view, and to prevent the communication with the gateway installed in the other ship view.

In addition, if an error occurs in the gateway, the registration procedure with other gateways can be performed quickly, thereby preventing the spread of damage that may occur in the distribution due to incommunicability.

1 is a block diagram of a distribution intelligence system according to an embodiment of the present invention.
2 is a conceptual diagram of a gateway and a sensor node according to an embodiment of the present invention.
3 is a block diagram of a configuration of a sensor node according to a temporal example of the present invention.
4 to 7 are views for explaining the operation of the sensor node according to the embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 is a block diagram of a distribution intelligence system according to an embodiment of the present invention.

1, a distribution automation operating system and a feeder remote terminal unit (FRTU) 30 are connected to a Smart Distribution Operating System (SDMS, Smart) based on DNP (Distributed Network Protocol) format or IEC61850 protocol format, Distribution Management System) and a smart distribution terminal device (FIED, Feeder Inteligent Electric Unit).

The gateway 20 is connected to the distribution automation network 40 and can convert data of the DNP protocol format input from the distribution intelligence terminal 30 into data of the IEC61850 protocol format and output to the distribution automation network 40. [

The gateway 20 may be installed at the front end of the distribution intelligent terminal device 30 and connected to the distribution automation network 40 or integrated in the distribution intelligent terminal device 30. Although the gateway 20 is installed in front of the distribution intelligent terminal 30 in the embodiment of the present invention, it can be integrated with the distribution intelligent terminal 30 to form a single unit. Quot; is included in the scope.

FIG. 2 is a conceptual diagram of a gateway and a sensor node according to an embodiment of the present invention, and FIG. 3 is a configuration block diagram of a sensor node according to a temporal example of the present invention.

2 and 3, a sensor node 10 according to an embodiment of the present invention includes a transmitter 11, a receiver 12, a filtering unit 13, a setting unit 14, and a controller 15 And the like.

The transmitting unit 11 can transmit a request signal in a broadcast manner. The transmitting unit 11 can broadcast a data frame of the form " $ SGRPT * CS " as a request signal. The broadcasting communication range of the transmitter 11 can be changed by setting.

(11) The transmitter may transmit request signals through channels 0 to 10, respectively. Each channel may be set to have a different frequency band. The transmitter 11 can sequentially transmit a request signal in a broadcast manner according to the channel order.

The transmitter 11 can transmit two request signals for each channel. The transmitting unit 11 may transmit a second request signal after waiting for 2000 to 3000 ms after transmitting the first request signal for each channel. The transmitter 11 may wait for 2000 to 3000 ms after transmitting the second request signal, and may move to the next channel and transmit the first request signal again. The waiting time of the transmitter 11 may be set differently according to the coverage of the distribution intelligent network as a time for receiving a response signal after transmitting the request signal. For example, when the coverage of the distribution intelligent network equipped with the sensor node 10 is wide, the transmission unit 11 may set a long waiting time for a response signal to the request signal by lengthening the waiting time, 10) is narrow, the gateway registration procedure can be performed more quickly by setting the waiting time to be short.

Also, the transmitting unit 11 can perform the retransmission of the request signal under the control of the control unit 15. The transmission unit 11 can perform retransmission of a request signal under the control of the control unit 15, for example, when the gateway 20 registration procedure is interrupted or when an error occurs in the connection gateway 20. [

The receiving unit 12 may receive a response signal for a request signal from a plurality of gateways 20. [ The receiving unit 12 can receive the response signal for the first request signal and the response signal for the second request signal separately. The response signal of the gateway 20 may have a data frame of the form " $ GSRPT * CS ", and may include identification information for distinguishing the gateway 20.

The filtering unit 13 can select the gateway 20 that has transmitted the response signal as the connectable gateway candidate. The filtering unit 13 can select a gateway connectable gateway candidate that has transmitted a response signal within the waiting time in response to the request signal. When the transmitting unit 11 transmits the first request signal and the second request signal, the filtering unit 13 transmits the first request signal and the response signal for the second request signal to the gateway 20, Candidates can be selected.

In addition, the filtering unit 13 can remove a gateway located in another power distribution line or a gateway in which an abnormality has occurred, from the connectable gateway candidate, under the control of the control unit 15. [

The setting unit 14 can set a gateway that has transmitted the request signal having the highest signal strength among the request signals received from the connectable gateway candidates to the connection gateway. The setting unit 14 can determine the received signal strength indicator (RSSI) of the response signal and compare the RSSI of each response signal. The setting unit 14 can select a response signal having the largest RSSI among the response signals received from the connectable gateway candidates and set the gateway that transmitted the response signal to the connection gateway.

When the transmitting unit 11 transmits the first request signal and the second request signal, the setting unit 14 compares the sum or the average value of the response signals with respect to the first request signal and the second request signal, Can be set.

The control unit 15 requests the connection gateway for the communication setting information and can perform the registration procedure of the connection gateway using the received communication setting information. The communication setting information may include communication frequency information, spreading factor information, ID information, and wiring information. The control unit 15 can set information for performing communication with the connection gateway using the received communication setting information.

The control unit 15 can stop the registration process for the gateway when the gateway is installed in another wiring using the wiring information. The control unit 15 can perform the registration procedure when the connection gateway is installed in the same distribution line as the sensor node using the wiring information among the communication setting information. However, if the connection gateway is installed in another distribution line different from the sensor node, the control unit 15 can stop the registration process of the connection gateway.

The distribution power grid can be divided into a form in which the distribution line starts from the substation and returns to the substation, and a form in which the substation power line is laid out to the final destination where power can be supplied. Therefore, sensor nodes and gateways applied to the distribution network should be installed with distribution lines, and when sensor nodes and gateways are installed in different distribution lines, problems arise in analyzing data and providing additional services using data .

Therefore, the sensor node 10 according to the embodiment of the present invention can prevent such a problem in advance by stopping the registration procedure when the connection gateway is disposed in another distribution line.

At this time, the setting unit 14 can set, as a connection gateway, a gateway that has transmitted the request signal with the highest signal strength among the connectable gateway candidates excluding the gateway whose registration procedure is interrupted under the control of the control unit.

Alternatively, the transmitting unit 11 may retransmit the request signal in a broadcast manner under the control of the control unit 15. [

That is, when the registration procedure of the connection gateway is stopped, the control unit 15 may request the setting unit 14 to select the gateway of the next highest available connection candidate as the connection gateway. In this case, the re-transmission of the request signal and the selection procedure of the gateway candidate for connection can be omitted, so that the registration procedure can be resumed swiftly.

Alternatively, the control unit 15 may resume the gateway registration procedure by requesting the transmission unit 11 to resend the request signal when the registration procedure of the connection gateway is interrupted. In this case, the response signal is retransmitted in real time, and the intensity of the signal is compared, so that a more accurate connection gateway can be selected.

If the control unit 15 fails to receive information from the registered access gateway for a preset time, the control unit 15 can control the transmitting unit 11 to resend the request signal. If the control unit 15 fails to receive information from the connection gateway for a preset time, it may determine that an error has occurred in the connection gateway, and perform a procedure for registering another gateway as a connection gateway. At this time, the control unit 15 may request the setting unit 14 to request removal of the connection gateway determined to have caused the error from the connectable gateway candidate.

4 to 7 are views for explaining the operation of the sensor node according to the embodiment of the present invention.

Referring to FIG. 4, the sensor node 100 transmits a request signal in a broadcast manner. All the gateways 210-230 receiving the request signal transmit the response signal in a broadcasting manner in response to the request signal.

The sensor node 100 selects all of the gateways 210 to 230 that have transmitted the response signal as connectable gateway candidates, and compares the signal strengths of the response signals.

The sensor node 100 sets the gateway 210 having the largest signal strength of the response signal as the connection gateway and requests the connectable gateway 210 for the communication setting information.

The sensor node 100 proceeds with the registration procedure with the connection gateway 210 using the communication setting information.

Referring to FIG. 5, the sensor node 100 stops the registration process when the connection gateway 230 is a gateway installed in another power line. The sensor node 100 sets the gateway 210 having the highest signal strength among the connectable gateway candidates excluding the connection gateway 230 as the connection gateway.

Referring to FIG. 6, the sensor node 100 stops the registration process when the connection gateway 230 is a gateway installed in another power distribution line. The sensor node 100 retransmits the request signal and receives a response signal from the gateway. At this time, the sensor node removes the gateway 230 which has been set as the connection gateway from being included in the connectable gateway candidate.

Referring to FIG. 7, when the sensor node 100 fails to receive information from the connection gateway 210 for a preset time, the sensor node 100 retransmits a request signal to perform the registration procedure of the access gateway again. At this time, the sensor node 100 removes the connection gateway 210, which is judged to have an error, not to be included in the connectable gateway candidate.

As used in this embodiment, the term " portion " refers to a hardware component such as software or an FPGA (field-programmable gate array) or ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.

10: Sensor node
20: Gateway
30: FRTU

Claims (9)

A sensor node disposed in a distribution facility,
A transmitter for transmitting a request signal in a broadcast manner;
A receiver for receiving a response signal for the request signal from a plurality of gateways;
A filtering unit for selecting a gateway that transmits the response signal as a connectable gateway candidate;
A setting unit configured to set a gateway that transmits a request signal having the largest signal strength among request signals received from the connectable gateway candidate as a connection gateway; And
And a control unit for requesting communication setting information including wiring information to the connection gateway and performing a registration procedure of the connection gateway using the received communication setting information,
The control unit performs the registration procedure when the gateway that transmits the request signal with the highest signal intensity using the wiring information is installed in the same distribution line as the sensor node, And stops the registration process when the transmitted gateway is installed in another power distribution line different from the sensor node. The method according to claim 1,
Wherein the transmitter transmits request signals through channels 0 through 10, respectively. 3. The method of claim 2,
Wherein the transmitter transmits two request signals for each channel. The method of claim 3,
Wherein the transmitter transmits a second request signal after waiting for 2000 to 3000 ms after transmitting a first request signal for each channel. The method according to claim 1,
Wherein the communication setting information includes communication frequency information, spreading factor information, and ID information. 5. The method of claim 4,
Wherein the transmitter sets a waiting time between the transmission of the first request signal and the transmission of the second request signal to be longer as the coverage of the distribution intelligent network provided with the sensor node is wider. The method according to claim 1,
Wherein the setting unit sets, as a connection gateway, a gateway that transmits a request signal having the highest signal strength among connectable gateway candidates excluding a gateway whose registration procedure is suspended. The method according to claim 1,
Wherein the transmission unit retransmits the request signal in a broadcast manner. The method according to claim 1,
Wherein the control unit controls the transmission unit to retransmit the request signal when the control unit fails to receive information from the registered access gateway for a predetermined period of time.

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