KR20090099698A - Wireless bridge communication apparatus that do duplexing in distribution automation system - Google Patents

Abstract

PURPOSE: A wireless bridge communication device which is duplicated in a distribution automation system is provided to enhance the stability by a backup wireless communication unit. CONSTITUTION: A wireless bridge communication device(300) which is duplicated in a distribution automation system comprises the first wireless communication unit(310), the second wireless communication unit(320), an antenna unit(340) and a relay unit. The first wireless communication unit wirelessly relays an automation control signal transceived through an FRTU(Feeder Remote Terminal Unit)(350) or a modem(360). The second wireless communication unit performs the wirelessly relay when the fact that the first wireless communication unit is abnormally not operated is detected.

Description

Wireless Bridge Communication Unit Dualized in Distribution Automation System {WIRELESS BRIDGE COMMUNICATION APPARATUS THAT DO DUPLEXING IN DISTRIBUTION AUTOMATION SYSTEM}

The present invention relates to a redundant communication device in a distribution automation system, and more particularly, to a redundant wireless bridge communication device that performs continuous communication by using a backup communication device that is in standby even when a failure occurs in consideration of a failure in a distribution automation system. It is about.

Electrical energy, which is widely used in various industries today, is produced and transported through a system called electric power system. Electric energy produced in various types of power plants is delivered to the power distribution facilities through high-voltage power transmission facilities and substations, and the power distribution facilities supply the received electric energy back to each customer. Consumers receive electrical energy from distribution facilities through distribution lines and use them to drive various electrical devices.

When one of the many switchgear devices located in the distribution line has a failure, it was troublesome to receive a report from the user who detected the failure and to have the management visit the site of the failure to adjust the connection status of the switchgear directly. .

Accordingly, a distribution automation system for automating the failure detection and recovery process of the distribution line switchgear has been proposed, and a distribution automation system based on an optical communication network is widely used.

1 is a diagram illustrating a configuration of a conventional power distribution automation system based on an optical communication network and including a fixed wireless bridge communication device.

First of all, except for the radio wave shape in FIG. 1, the distribution automation system (DAS) controls an electric line short circuit along the electric pole along with the main device 100 and the electric line, which are representative names of the upper server and the user interface. Automatic control devices (FRTU: Feeder Remote Terminal Unit (FRTU)) inside the automation device (121 ~ 127), and the central office terminal (COT) 110 and the optical modem for their communication network configuration It can be seen that the optical communication network composed of the RT (Remote Terminal) 161 (121 ~ 127).

The main device 100 and the COT 11 are mainly built in the operation room of the distributor company unit, and the automation devices 121 to 127 having the optical communication line and the RT at the bottom thereof are installed together in all directions of the region.

In FIG. 1, although the optical communication network is drawn as one, in general, since one COT 110 is limited in number to 30 or less RTs, many COTs and RTs are actually installed.

The inside of the automation devices 121 to 127 is connected to the FRTU 162 via the COT 110 and the RT 161 because the RT 161 and the FRTU 162 are connected by an Rs232C serial line. It may be delivered and performed, and an event such as an electrical short circuit occurring in the FRTU 162 is also delivered to the main device through the RT 161 and the COT 110 in the FRTU.

In FIG. 1, a portion not connected to the optical communication network represents a configuration of a local wireless cell by a fixed wireless bridge communication apparatus (hereinafter, referred to as a "FWB communication apparatus" or "FWB").

As can be seen through FIG. 1, the FWBs 141 to 155 can increase automation devices 131 to 135 for power distribution automation without using additional optical lines by using an optical network currently operating as a backbone. have.

This configuration can be connected to up to five FRTUs per RT (161), it is possible to easily expand the distribution automation area by utilizing this wireless communication section. The FWB is used for this purpose. Even if this method is used, the expansion effect is not small because the main unit can operate the power distribution with the same performance as before.

Next, the FWB will be described in more detail with reference to FIG. 2 below.

2 is a view showing the configuration of a wireless bridge communication apparatus in a conventional distribution automation system. Referring to FIG. 2, the conventional FWB 141 includes a wireless communication unit 210 and an antenna unit 220.

Here, the wireless communication unit 210 may relay or intercept data transmitted between the FRTU 162 and the modem (RT) 161 that communicate using a serial communication line. Through the unit 711 may be transmitted to the wireless communication.

The antenna unit 220 includes one or more antennas and transmits data received from the wireless communication unit 210 and transmits data received from the wireless communication unit 210. In addition, one or more directional antennas may be included, and when one directional antenna is included, one direction direction is included, and when two directional antennas are included, both directions are provided.

When the wireless communication unit 210 is broken in the conventional FWB as described above, a situation in which the distribution automation control signal on the distribution automation system may not be delivered may require a study of the FWB for stably operating the distribution automation system. .

The present invention has been made to improve the prior art as described above, and an object of the present invention is to provide a wireless bridge communication device redundant in a distribution automation system.

Another object of the present invention is to provide a redundant wireless bridge communication device that allows continuous communication using a backup communication device that is waiting even if a failure occurs in consideration of a distribution automation system.

The object of the present invention is not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

According to a first aspect of the present invention for achieving the above objects, a redundant wireless bridge communication device, wirelessly transmits and receives an automation control signal transmitted and received through a Feeder Remote Terminal Unit (FRTU) or a modem (Modem) A first wireless communication unit for relaying to the network; A second wireless communication unit which performs wireless relay when the first wireless communication unit detects that the normal operation is not performed; An antenna unit for transmitting and receiving high frequency wireless signals through a wireless channel; And a relay unit configured to provide a signal received from the first wireless communication unit or the second wireless communication unit to the antenna unit and provide a signal received from the antenna unit to the first wireless communication unit and the second wireless communication unit.

Specific details of other embodiments are included in the detailed description and the accompanying drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only the present embodiments to make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

As described above, the present invention includes a first wireless communication unit for wirelessly relaying an automation control signal transmitted and received through a Feeder Remote Terminal Unit (FRTU) or a modem; A second wireless communication unit which performs wireless relay when the first wireless communication unit detects that the normal operation is not performed; An antenna unit for transmitting and receiving high frequency wireless signals through a wireless channel; And a distribution unit configured to provide a signal received from the first wireless communication unit or the second wireless communication unit to the antenna unit and transmit a signal received from the antenna unit to the first wireless communication unit and the second wireless communication unit. The present invention relates to a wireless bridge communication device duplexed in an automation system, and it is helpful to stably operate a distribution automation system since there is a wireless communication unit to cope with a failure of one wireless communication unit. In addition, redundancy generally increases the complexity of the configuration, but the present invention provides an efficient redundancy structure without significantly increasing the complexity.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention; If it is determined that the gist of the present invention may be unnecessarily obscured, detailed description thereof will be omitted.

The present invention relates to a redundant wireless bridge communication device that allows continuous communication using a backup communication device that is waiting even if a failure occurs in a distribution automation system.

A redundant wireless bridge communication apparatus according to an embodiment of the present invention includes a first wireless communication unit for wirelessly relaying an automation control signal transmitted and received via a Feeder Remote Terminal Unit (FRTU) or a modem; A second wireless communication unit which performs wireless relay when the first wireless communication unit detects that the normal operation is not performed; An antenna unit for transmitting and receiving high frequency wireless signals through a wireless channel; And a relay unit configured to provide a signal received from the first wireless communication unit or the second wireless communication unit to the antenna unit and provide a signal received from the antenna unit to the first wireless communication unit and the second wireless communication unit.

In one embodiment, the relay unit provides a signal received from the first wireless communication unit or the second wireless communication unit to the antenna unit and distributes a signal received from the antenna unit to the first wireless communication unit and the second wireless communication unit. It can be configured as a distribution unit.

In an embodiment, the relay unit may be configured as a communication switch unit connecting the connection of the antenna unit to the first wireless communication unit or the second wireless communication unit according to a control signal from the first wireless communication unit.

Hereinafter, each detailed embodiment according to the configuration of the relay unit will be described with reference to the accompanying drawings.

3 is a diagram illustrating a configuration of a wireless bridge communication apparatus according to an embodiment of the present invention. Referring to FIG. 3, the wireless bridge communication device (FWB) 300 includes a first wireless communication unit 310, a second wireless communication unit 320, a distribution unit 330, and an antenna unit 340. .

The first wireless communication unit 310 and the second wireless communication unit 320 relays or intercepts data transmitted / received between the FRTU 350 and the modem 360, which communicate using a serial communication line, to another FWB. It is a device that receives or transmits distribution automation control signal by communicating with wireless.

In this case, the first wireless communication unit 310 and the second wireless communication unit 320 transmits a heartbeat signal to the counterpart wireless communication unit at predetermined time intervals to inform whether the normal state.

When both the first wireless communication unit 310 and the second wireless communication unit 320 are normal, the first wireless communication unit 310 which is the main communication unit is responsible for wireless relay. In this case, the second wireless communication unit 320, which is a backup communication unit, does not perform wireless relay. In addition, the second wireless communication unit 320 performs only relay without intercepting a signal between the FRTU 350 and the modem 360 through the serial communication line. At this time, the second wireless communication unit 320 transmits only the heartbeat signal to the first wireless communication unit 310 at a predetermined interval.

However, if the first wireless communication unit 310 is not normal, that is, if the second wireless communication unit 320 does not receive the heartbeat signal transmitted by the first wireless communication unit 310, the second wireless communication unit 320 The wireless relay that is being performed by the first wireless communication unit 310 takes over and is processed. In this case, the second wireless communication unit 320 may transmit failure information indicating that the first wireless communication unit 310 is abnormal to an upper server such as an NMS managing the distribution automation system.

The distribution unit 330 receives data to be transmitted wirelessly from the wireless communication unit operating among the first wireless communication unit 310 and the second wireless communication unit 320 and transmits the data to the antenna unit 340. In addition, the distribution unit 330 transmits the response signal received from the antenna unit 340 to both the first wireless communication unit 310 and the second wireless communication unit 320 to be processed by the wireless communication unit operating with the operating right.

The antenna unit 340 includes one or more antennas and wirelessly transmits data received through the distribution unit 330, and provides a wireless signal received through the antenna to the distribution unit 330.

3 is a diagram of a wireless bridge communication device in a distribution automation device connected to an optical communication network. In the case of the distribution automation device which is wirelessly controlled without being connected to the optical communication network, the modem 360 does not have the modem 360, and thus the modem 360 is omitted in FIG. 3 and the serial communication line between the second wireless communication unit 320 and the modem is also omitted. do.

4 is a diagram illustrating a configuration of a wireless bridge communication apparatus according to another embodiment of the present invention. Prior to the description of FIG. 4, the same parts as in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

Unlike FIG. 3, FIG. 4 includes a communication switch unit 430 instead of the distribution unit 330. At this time, the first wireless communication unit 410 performs the basic functions of the first wireless communication unit 310 of FIG. In addition, the first wireless communication unit 410 further controls the communication switch unit 430 by transmitting a switch control signal for controlling the communication switch unit 430 to the communication switch unit 430 at a predetermined time interval.

Therefore, the first wireless communication unit 410 and the second wireless communication unit 320 due to an error in the configuration as shown in Figure 4 due to the additional operation of controlling the communication switch unit 430 more complicated. Even if all operate with an operating right, it is possible to enable normal control through the communication switch unit 430.

In the case where both the first wireless communication unit 410 and the second wireless communication unit 320 operate with an operating right due to an error, the first wireless communication unit may be a heartbeat transmission error transmitted at a predetermined interval by the first wireless communication unit 410. 410 operates substantially with priority. However, in this case, the second wireless communication unit 320 that does not receive the heartbeat operates by determining that the first wireless communication unit 410 is broken. Therefore, a problem may arise in that both wireless communication units operate.

Next, a detailed description of the wireless communication unit in the wireless bridge communication apparatus described with reference to FIGS. 3 and 4 will be described below with reference to FIGS. 4 and 5.

5 is a diagram illustrating a configuration of a wireless communication unit in a wireless bridge communication apparatus according to an embodiment of the present invention. Referring to FIG. 5, the wireless communication unit 310 of the present invention includes a heartbeat processing unit 501, a serial control unit 503, a switch unit 505, a data relay unit 507, and an RF processing unit 509. .

The heartbeat processing unit 501 generates a heartbeat at a predetermined time interval and transmits the heartbeat to the second wireless communication unit 320. In addition, the heartbeat processing unit 501 is responsible for monitoring the heartbeat transmitted by the second wireless communication unit 320 to perform the determination of the switching operation of the redundancy. Basically, the first wireless communication unit 310 is set to have an operation right first, and the second wireless communication unit 320 is set to have an operation right only when the heartbeat is not detected due to the abnormality of the first wireless communication unit 310. .

The serial control unit 503 controls the switch unit 505 when there is an operating right to connect the line so that the data relay unit 507 can obtain data from the serial communication line. However, if there is no operating right, the serial control unit 503 controls the switch unit 505 to directly transmit and receive communication lines between the FRTU 350 and the modem 360 so that the serial communication line does not go through the data relay unit 507. Control data to be bypassed.

That is, according to the present invention, the serial control unit 503 can be used to configure one serial communication line without duplication of communication lines between the FRTU 350 and the modem 360.

The data relay unit 507 relays an automation control signal transmitted and received through the wireless and performs a routing function of protocol conversion of data frames between wired communication and wireless communication and forwarding data to another wireless bridge communication device. In this case, the automation control signal includes an automation control request signal and an automation control response signal.

The RF processor 509 is a device for transmitting and receiving high frequency radio signals, and converts the received high frequency radio signals into baseband signals to provide them to the data relay unit 507 or to transmit signals received from the data relay unit 507 to high frequency. Convert to a wireless signal.

6 is a diagram illustrating a configuration of a wireless communication unit in a wireless bridge communication apparatus according to another embodiment of the present invention. Prior to the description of FIG. 6, the same parts as those described in FIG. 4 or FIG. 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 6, the configuration of the first wireless communication unit 410 is different from the configuration of the first wireless communication unit 310 described above, and the operation of the heartbeat processing unit 601 is performed.

In the present invention, the heartbeat processing unit 601 of the first wireless communication unit 410 transmits a switch control signal for controlling the communication switch unit 430 at regular intervals so that the first wireless communication unit 410 may perform a wireless relay. Control to connect with the antenna.

In this case, when the communication switch unit 430 does not detect the switch control signal at a predetermined time interval, the communication switch unit 430 determines that an error has occurred in the first wireless communication unit 410, and the antenna may allow the second wireless communication unit 320 to perform a wireless relay. Connect.

On the other hand, the heartbeat processing unit 601 for generating a switch control signal for controlling the communication switch unit 430 is the first wireless communication unit 410 preset to have an operating right when there is no abnormality in both wireless communication unit Is generated only in the heartbeat processing unit 601.

7 is a diagram illustrating a configuration of a data relay unit in a wireless communication unit of a wireless bridge communication device according to an embodiment of the present invention.

Referring to FIG. 7, the data relay unit 507 of the present invention includes a routing table storage unit 701 for storing a routing table for packet forwarding between a plurality of wireless bridge communication devices, a protocol for performing a data frame protocol conversion function. The converter 703 may include a data frame checker 705 for checking whether a data frame is transmitted or received.

The routing table storage unit 701 stores a routing table including an address of each FWB in order to perform routing between the FWBs. In this case, the routing table may be dynamically updated by the distribution automation system administrator or in accordance with changes in the routing environment.

The protocol conversion unit 703 converts different communication protocols between wireless communication and wired communication to enable relaying. For example, when the wireless communication follows the Ethernet protocol and the distribution automation control signal follows the Distributed Network Protocol (DNP), the protocol conversion unit 703 converts the Ethernet frame received through the wireless communication into a DNP frame to perform wired communication. Transmit to FRTU or modem. Alternatively, the protocol conversion unit 703 may convert the DNP frame received through wired communication into an Ethernet frame and transmit it to another FWB communication device through the FWB channel.

The data frame checker 705 may apply a security algorithm to the data frame to perform a security check on the data frame. In detail, the data frame inspecting unit 705 may encrypt and decrypt the data frame according to a predetermined security algorithm.

Distribution automation systems play an important role in controlling the opening and closing of distribution lines, and can cause large power outages if problems arise. Therefore, the implementation of a security function is required to block the transmission and reception of abnormal data from an external device in advance.

While specific embodiments of the present invention have been described so far, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below, but also by the equivalents of the claims.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

1 is a diagram illustrating a configuration of a conventional distribution automation system based on an optical communication network and including a fixed wireless bridge communication device.

2 is a view showing the configuration of a fixed wireless bridge communication apparatus in a conventional distribution automation system,

3 is a diagram showing the configuration of a fixed wireless bridge communication apparatus according to an embodiment of the present invention;

4 is a diagram showing the configuration of a fixed wireless bridge communication apparatus according to another embodiment of the present invention;

5 is a diagram illustrating a configuration of a wireless communication unit in a fixed wireless bridge communication apparatus according to an embodiment of the present invention;

6 is a diagram illustrating a configuration of a wireless communication unit in a fixed wireless bridge communication apparatus according to another embodiment of the present invention;

7 is a diagram illustrating a configuration of a data relay unit in a wireless communication unit of a fixed wireless bridge communication apparatus according to an embodiment of the present invention.

Claims (10)

A first wireless communication unit wirelessly relaying an automation control signal transmitted and received through a Feeder Remote Terminal Unit (FRTU) or a modem; A second wireless communication unit which performs wireless relay when the first wireless communication unit detects that the normal operation is not performed; An antenna unit for transmitting and receiving high frequency wireless signals through a wireless channel; And And a relay unit configured to provide a signal received from the first wireless communication unit or the second wireless communication unit to the antenna unit and provide a signal received from the antenna unit to the first wireless communication unit and the second wireless communication unit. Redundant wireless bridge communication device. The method of claim 1, And the first wireless communication unit and the second wireless communication unit are located on one serial communication line. The method of claim 1, wherein the first wireless communication unit, RF processing unit for transmitting and receiving high frequency wireless signal; A data relay unit which wirelessly relays the automation control signal transmitted and received through the remote control terminal device or the modem; A heartbeat processing unit determining whether the first wireless communication unit has an operating right to perform wireless relaying; A serial control unit controlling a switch unit to connect a serial communication line to the data relay unit for wireless relaying when the operating right is obtained; And And a switch unit for connecting a serial communication line between the remote control terminal device and the modem to the data relay unit under the control of the serial control unit. The method of claim 3, wherein the heartbeat processing unit, And generating a heartbeat at a predetermined time interval and transmitting the heartbeat to the second wireless communication unit, and detecting a heartbeat transmitted by the second wireless communication unit. The method of claim 3, wherein the heartbeat processing unit, The redundant wireless bridge communication device, characterized in that it is determined that an error has occurred in the second wireless communication unit if the heartbeat is not received from the second wireless communication unit at a predetermined time interval. The method of claim 3, wherein the heartbeat processing unit, And the first wireless communication unit and the second wireless communication unit are both normal, determining that the first wireless communication unit has priority. The method of claim 3, wherein the switch unit, Redundant wireless bridge communication device characterized in that the connection to the remote control terminal device and the modem via a serial communication line without connecting to the data relay if the serial control unit does not receive a switch control signal of a predetermined interval. The method of claim 3, wherein the heartbeat processing unit, The redundant wireless bridge communication device, characterized in that for reporting the presence or absence information of the abnormal state of the first wireless communication unit and the second wireless communication unit at a predetermined time interval. The method of claim 1, wherein the relay unit, A redundancy unit providing a signal received from the first wireless communication unit or the second wireless communication unit to the antenna unit and distributing a signal received from the antenna unit to the first wireless communication unit and the second wireless communication unit. One wireless bridge communication device. The method of claim 1, wherein the relay unit, And a communication switch unit for connecting the antenna unit to the first wireless communication unit or the second wireless communication unit according to a control signal from the first wireless communication unit.

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