WO2007141832A1

WO2007141832A1 - Power line communication system and power line communication method

Info

Publication number: WO2007141832A1
Application number: PCT/JP2006/311091
Authority: WO
Inventors: Tetsuro Shimomura
Original assignee: Mitsubishi Electric Corporation
Priority date: 2006-06-02
Filing date: 2006-06-02
Publication date: 2007-12-13
Also published as: JPWO2007141832A1

Abstract

Provided is a power line communication system in which data communication is performed between a primary station arranged in a substation and a child station arranged in a building of a communication contractor by using a power line of a power system. The power line communication system includes: an ON/OFF switch (43) for switching the connection state between a first primary station (30) and a terminal of the opposite side of a first power line and a second primary station (31) and a terminal of the opposite side of a second power line to OFF or ON; and a power line signal switching device (180) arranged in parallel to the ON/OFF switch (43) and having signal coupling means for relaying a power line signal between the first power line and the second power line according to voltage detection results of the first power line and the second power line. When the ON/OFF switch (43) is in OFF state and the first power line or the second power line is partially disconnected to disable power line communication between the primary station and the child station, the power line signal switching device (180) relays the power line signal by bypassing the ON/OFF switch (43).

Description

Specification

Power line carrier communication system and power line carrier communication method

Technical field

TECHNICAL FIELD [0001] The present invention relates to a power line communication (PLC) communication system and a power line carrier communication method connected to a wide area communication network such as a broadband network, and more particularly, a primary station of a power line carrier modem. Even if the (main terminal) cannot communicate with the slave station that communicates via the power line, it continues communication with the broadband network by relaying signals to other primary stations. The present invention relates to a power line carrier communication system and a power line carrier communication method.

Background art

[0002] In the conventional signal coupling device for distribution line carrier signals, a primary station for PLC communication is installed near the substation in the power system (distribution system) where multiple power lines are connected to the transformer of the substation. Then, the power station (distribution line) connected to the bus of the substation connected to the power line transport modem PLC modem connected to the power line to communicate. For example, Japanese Patent Laid-Open No. 10-290185 (Patent Document 1) describes a method of coupling to a substation bus using a signal coupling device when a carrier signal (PLC signal) is injected into or extracted from a distribution line. Has been.

[0003] Also, in Japanese Patent Laid-Open No. 62-43924 (Patent Document 2), when a circuit for transmitting a PLC signal is opened, a signal detour is provided in parallel with the open switch for communication. It is stated that it will continue.

In Japanese Patent Application Laid-Open No. 62-43924, as described above, communication is continued by providing a circuit for bypassing the PLC signal to the open switch.

However, if the power line is physically open in the part other than the switch, such as disconnection, communication is not possible even if a communication detour is provided in the switch part.

[0004] As a countermeasure against this, it is conceivable to continue communication with the broadband network by communicating with adjacent sections that transmit signals of different primary stations.

Since the connection with this adjacent section is normally operated in an open state, If the detour described in Sho 62-43924 is provided, a communication channel with the adjacent section can be established.

By the way, in PLC communication, communication is established by the main terminal sending a poll signal to the slave station and responding to the poll signal received by the slave station.

The poll signal is a signal for establishing communication by transmitting a signal transmitted from a transmitting station back to the transmitting station when the signal is transmitted to the transmitting station.

[0005] If a bypass route that always bypasses the PLC signal between adjacent sections is provided, 2 signals are always sent from the primary station (main terminal) to the slave station. You will receive a poll signal from two different primary stations (main terminals), and you will not be able to determine which primary station you want to communicate with, and you will not be able to communicate one-to-one between the primary station and the slave station. There is a problem.

Further, the distribution line carrier signal coupling device disclosed in Japanese Patent Laid-Open No. 10-290185 has the same problem.

[0006] Patent Document 1: Japanese Patent Laid-Open No. 10-290185

Patent Document 2: Published Patent Publication No. Sho 62-43924

Disclosure of the invention

Problems to be solved by the invention

[0007] The present invention has been made to solve the above-described problems, and includes PLC communication.

Even if the power line (distribution line) of the system performing (power line carrier communication) is in the “disconnected” state, the power line carrier can continue to communicate with the broadband network using another system. An object is to provide a communication system and a power line carrier communication method.

Means for solving the problem

[0008] A power line carrier communication system according to the present invention uses a power line of a power system to perform data communication between a primary station arranged in a substation and a slave station arranged in a building of a communication contractor. A power line carrier communication system for performing

A first primary station and a second primary station that transmit and receive information data to and from the knockbone network; a first slave station that performs power line carrier communication with the first primary station via a first power line; A second slave station that performs power line carrier communication with the second primary station via a second power line; A switching switch for switching a connection state between an end of the first power line opposite to the first primary station and an end of the second power line opposite to the second primary station to open or close And relaying a power line carrying signal between the first power line and the second power line based on a voltage detection result of the first power line and the second power line. A power line carrier signal switching device (180) having a signal coupling means for performing either of the first power line or the second power line when the switching switch is in an open state, When the power line carrier communication cannot be performed between the primary station and the slave station, the power line carrier signal switching device bypasses the switching switch and relays the power line carrier signal.

[0009] A power line carrier communication method according to the present invention uses a power line of a power system, a plurality of primary stations arranged in a substation, and a communication contractor's building corresponding to each of the plurality of primary stations. A power line carrier communication method for performing data communication with a plurality of slave stations arranged in

The plurality of primary stations communicate with the backbone network, but each primary station does not perform direct communication. In operation, a part of the power line path carrying the signal is opened and the plurality of primary stations are opened. When some or all of the slave stations communicate and become unable to communicate with the primary station, some or all of the slave stations can communicate with other primary stations. In this way, the signal communication path is switched and communication with the backbone network is continued.

A power line carrier communication method.

The invention's effect

[0010] According to the power line carrier communication system or the power line carrier communication method of the present invention, even if the power line (distribution line) of the system performing the power line carrier communication is in a "disconnected" state, the signal communication path By switching, you can continue to communicate with the broadband network using other power lines.

Brief Description of Drawings

FIG. 1 is a diagram showing an overall configuration of a PLC communication system according to a first embodiment.

FIG. 2 is a schematic configuration of a PLC signal switching device in the PLC communication system according to Embodiment 1. FIG.

[3] FIG. 3 is a diagram for explaining an operation example of the PLC signal switching device shown in FIG.

[4] FIG. 4 is a diagram for explaining an operation example of the PLC signal switching device shown in FIG.

V 5] A flowchart for explaining a signal switching operation in the PLC communication system according to the first embodiment.

FIG. 6 is a diagram showing a modification of the PLC communication system according to the first embodiment.

FIG. 7 is a diagram showing a configuration of a PLC signal switching device in a PLC communication system according to a second embodiment.

圆 8] A flowchart for explaining a signal switching operation in the PLC communication system according to the second embodiment.

FIG. 9 is a diagram showing a configuration of a PLC signal switching device in a PLC communication system according to a third embodiment.

FIG. 10 is a diagram showing a configuration of a PLC signal switching device in a PLC communication system according to a fourth embodiment.

FIG. 11 is a diagram showing a configuration of a PLC signal switching device in a PLC communication system according to a fifth embodiment.

FIG. 12 shows an overall configuration of a PLC communication system according to a sixth embodiment.

FIG. 13 is a diagram showing an overall configuration of a PLC communication system according to a seventh embodiment.

Explanation of symbols

1 Backbone network (broadband network)

2, 3, 4 Network communication line

3 Network communication line

5 Upper power grid A 6 Upper power grid B

10 Substation A 11 Substation B

20, 21, 22 High voltage Z Medium voltage transformer

30, 31, 32 Primary station

40, 50, 54, 55 Substation bus

41, 48, 49, 51 Circuit breaker 42 Category switch 43 Switching switch

44, 45, 47, 52 Distribution lines (power lines)

46, 53 Branch distribution line (branch power line)

60, 61, 62 Medium / low voltage transformer

70, 71, 72, 73, 74 Low voltage distribution line (low voltage power line)

100, 111, 112, 113 MV nodes

121, 122, 123, 124, 125 CPE (slave station)

180 PLC signal switching device

191, 192 PLC communication data signal

210, 214 signal combiner

213 Control device 215 Signal holding device 1

216 Signal presence check device 217 Signal holding device 2

218 Signal relay command device

220 Voltmeter 1 221 Voltmeter 2

223 Voltage detector 1 224 Voltage detector 2

225 Signal relay switch 226 Open / close state detection device

230, 231 Grounding device (inductance)

240, 241 Surge absorber (arrester)

251 Signal bypass device 260 Signal block device

270 High Pass Filter (HPF)

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In the drawings, the same reference sign indicates the same or equivalent. Embodiment 1.

FIG. 1 is a diagram for explaining the overall configuration of the power line carrier communication system according to the first embodiment of the present invention.

In the figure, reference numeral 10 denotes a distribution substation (hereinafter simply referred to as a substation), and a plurality of primary stations (MVHE: main terminals) are arranged in the substation 10. For example, assume that two primary stations, a primary station 30 and a primary station 31, are arranged in the substation 10.

55, 40, and 54 are substation buses (hereinafter simply referred to as busbars), and substation bus 55 is connected to upper power system A (indicated by reference numeral 5). The bus 55 is connected to the bus 55 via the medium voltage transformer 20, and the bus 54 is connected to the bus 55 via the high voltage Z medium voltage transformer 21.

The primary station 30 is connected to a backbone network (broadband network) 1 through a network communication line 2 and also connected to a bus 40.

The primary station 31 is connected to the backbone network (broadband network) 1 by a network communication line 3 different from the network communication line 2 and to the bus 54.

2a is information data transmitted / received between the backbone network 1 and the primary station 30 via the network communication line 2, and 3a is transmitted / received between the backbone network 1 and the primary station 31 via the network communication line 3. Information data.

[0015] In addition, 44 is a distribution line (power line) connected to the bus 40 via a distribution line breaker (hereinafter simply referred to as a breaker) 41 in the substation 10, and 45 is a distribution line breaker in the substation 10. A distribution line (power line) connected to bus 54 via circuit breaker 49 !.

Reference numeral 47 denotes a distribution line (power line) connected to the distribution line 44 via the section switch 42.

The section switch is a switch for separating the section where the accident has occurred from the healthy section when an accident occurs in the distribution system.

43 is a switching switch connected to the distribution line 47 and the distribution line 45, and a PLC signal switching device 180, which will be described later, is connected in parallel with the switching switch 43.

[0016] Primary station 30 installed in substation 10 is in parallel with bus 40, circuit breaker 41, distribution line 44, section switch 42, distribution line 47, branch distribution line 46, medium-voltage, low-voltage transformer 60. Connected MV (Medium Voltage: Medium voltage of about 6000V to 30,000V) Node 111, a slave station located in PLC communication subscriber's building 120 via low-voltage distribution line 70 CPE (Customer Premise Equipment: Home communication device Z home modem) 121 and PLC communication I believe.

Note that an arrow 191 indicated by an alternate long and short dash line in the figure indicates a PLC communication data signal distributed from the primary station 30.

The primary station 30 communicates with the backbone network 1 via the network communication line 2.

[0017] Similarly, the primary station 31 installed in the substation 10 includes a bus 54, a circuit breaker 49, a distribution line 45, an MV node 113, an MV node 113 connected in parallel to the medium voltage Z low voltage transformer 62, It communicates with a CPE (Customer Premise Equipment) 124, which is a slave station, via a low voltage distribution line 74.

In addition, an arrow 192 indicated by a broken line in the figure indicates PLC communication data 2 distributed from the primary station 31.

The carrier frequency of PLC communication data distributed from the primary station 30 or the primary station 31 is preferably about 1ΜΗζ to 50ΜΗζ.

Further, the primary station 31 communicates with the backbone network 1 via the network communication line 3.

Distribution line 47 and distribution line 45 are connected to each other by switching switch 43.In the normal operation state, switching switch 43 is open, and distribution line 47 and distribution line 45 are electrically connected by switching switch 43. In a state of being disconnected.

FIG. 2 is a diagram showing a schematic configuration of PLC signal switching device 180 used in the power line carrier communication system according to the present embodiment shown in FIG.

The PLC signal switching device 180 includes a signal coupling device (consisting of a capacitance or electromagnetic coupling device) 210 connected to the distribution line 47, a signal coupling device 213 connected to the distribution line 45, and the signal coupling devices 210 and 214. Connected signal relay switch 225, voltmeter 1 for measuring the voltage of distribution line 47 (indicated by reference numeral 220), voltmeter 2 for measuring the voltage of distribution line 45 (indicated by reference numeral 221), voltage detector 1 (reference numeral 223) ), A voltage detection device 2 (indicated by reference numeral 224), and a control device 213 that opens and closes the signal switch 225 in response to a signal from the voltage detection device.

Next, the operation will be described. As shown in Fig. 2, when distribution line 47 and distribution line 45 are healthy and power is supplied normally, the rated operating voltage is applied to distribution line 47 and distribution line 45. Total 1 (indicated by reference numeral 220) measures the voltage of the power line 47 and outputs a voltage value.

Voltage detector 1 (indicated by reference numeral 223) determines that the path to substation 10 is normal when the output of voltmeter 1 (220) is greater than the set value (for example, 90% of the rated voltage value). Output a signal (for example, 1.0).

Similarly, voltmeter 2 (indicated by reference numeral 221) measures the voltage of distribution line 45 and outputs a voltage value.Voltage detection device 2 (indicated by reference numeral 224) has the output of voltmeter 2 (221) set to the set value ( For example, if it is greater than 90% of the rated voltage value, it is determined that the path to the substation is normal and a signal (eg, 1.0) is output.

The control device 213 turns on (closes) the signal relay switch 225 when the voltage (ie, VI or V2) detected by the voltage detection device 1 (223) or the voltage detection device 2 (224) is no voltage. .

FIG. 3 is a diagram for explaining an operation example of the PLC signal switching device 180 shown in FIG. 2, and shows a specific configuration of the control device 213.

As shown in FIG. 3, when a signal is output from the voltage detection device 1 (223), the signal holding device 1 of the control device 213 (indicated by reference numeral 215) has a certain magnitude that continues for ηΧΔΤ, for example, Outputs 1.0.

Here, ΔΤ is the sample hold time of the voltage detection device 1 (223) and the voltage detection device 2 (224), and n is a value of 2 or more.

Similarly, the signal holding device 2 (indicated by reference numeral 217) of the control device 213, when the voltage detection device 2 (224) force signal is output, has a constant magnitude that continues for ηΧΔΤ time, for example 1.0. Output.

The signal presence / absence check device (indicated by reference numeral 216) checks the output magnitudes of the signal holding device 1 (215) and the signal holding device 2 (217).

If the output of the signal holding device 1 (215) is a specified value, for example 0.5 or more, the signal relay switch H Set the operation command value to o.

As shown in FIG. 3, even if the output of the signal holding device 2 (217) is a specified value, for example 0.5 or more, the output of the signal holding device 1 (215) is a specified value, for example, 0.5 or more. If so, the command value is set to 0.

On the other hand, if the output of the signal holding device 1 (215) is less than the specified value and the output of the signal holding device 2 (217) is more than the specified value (e.g. 0.5), the turn command value of the signal relay device operation 218 Set to 1.0.

The signal relay command device 218 checks the relay command value of the signal presence / absence check device 216 every ΔΤ, and if it is less than a specified value (for example, 0.5), the signal relay switch 225 is opened.

If it is a specified value (for example, 0.5) or more, the signal relay device 225 is turned on (closed).

[0023] That is, when the rated operating voltages of both lines (distribution line 47 and distribution line 45) are detected together, both primary station 30 and primary station 31 are judged to be healthy, and signal relay switch 2 25 is not turned on (closed).

Therefore, the signal of the primary station 30 is transmitted to the distribution line 47 but is not transmitted to the distribution line 45 side. Similarly, the signal of the primary station 31 is transmitted to the distribution line 45, but the distribution line 45 The primary station 30 communicates with the CPE 121 which is the slave station, and the primary station 31 communicates with the CPE 124 which is the slave station.

FIG. 4 is a diagram for explaining the operation of the control device 213 when no voltage is detected by the voltage detection device 1 (223).

For example, when the path between the primary station 30 and the distribution line 47 is disconnected and the signal from the primary station 30 cannot be passed, the voltage detector 1 (223) detects the normal rated voltage of the distribution line 47. No signal is output from the signal holding device 1.

On the other hand, if the voltage of distribution line 45 is detected by voltage detection device 2 (224) and the line from primary station 31 to distribution line 45 is healthy, the signal distributed from primary station 31 is connected to the signal coupling device. You can pass up to 214.

When the voltage of only one of the distribution line 45 or the distribution line 47 is detected, the control device 213 determines that a failure has occurred in the other communication path, and turns on the signal relay switch 225. [0025] Thereby, the signal of the primary station 31 is injected into the distribution line 47 via the signal coupling device 214, the signal relay switch 225, and the signal coupling device 210, and communicated with the CPE 121 connected to the distribution line 47. Can be established.

In addition, if the path between the primary station 30 and the distribution line 47, which has become unable to communicate, returns to normal and the voltage of the distribution line 47 is detected by the voltage detection device 1 (223), the signal relay command device 21 Set the operation command value of 8 to 0.

In response to the operation command value 0, the signal relay command device 218 opens the relay switch 225.

FIG. 5 is a flowchart for explaining a signal switching operation in the PLC communication system according to the present embodiment.

The signal switching operation according to the present embodiment will be described based on the flowchart of FIG.

First, the case where a voltage is applied to both the distribution line 47 and the distribution line 45 will be described.

In this case, since the voltage detection device 1 (223) and the voltage detection device 2 (224) detect the voltage, the signal holding device 1 (215) and the signal holding device 2 (217) both have the signal 1 . 0 is output.

When the computing power starts, first, the output signal level of the signal holding device 1 (215) is checked (step S100).

Since the voltage detection device 1 (223) outputs the signal 1.0, the output signal of the signal holding device 1 (215) is 1.0.

Accordingly, in step S100, since the condition of “signal> 0.5” is satisfied, a Yes determination is made, and the process proceeds to step S200.

[0027] In step S200, since the output signal of the signal holding device 2 (217) is 1.0, the determination is Yes, and the process proceeds to step S201.

In step S201, the operation command of the signal relay switch 225 is set to 0, and the process proceeds to step S300.

In step S300, since the operation command value of signal relay switch 225 is 0, No In step S301, the signal relay switch 225 is selected to be opened. Therefore, the signal coupling device 210 and the signal coupling device 214 are not coupled to each other, and the signal relay operation by the PLC signal switching device 180 does not occur! ,.

As described above, when a voltage is applied to the gap between the distribution line 47 and the distribution line 45, the signal relay operation is not performed.

[0028] Next, the case where no voltage is applied to the distribution line 47 for some reason and the voltage is normally applied to the distribution line 45 will be described.

In this case, since the voltage detection device 1 (223) does not detect the voltage, the signal holding device 1 (

215) outputs a signal 0.

On the other hand, since the voltage detection device 2 (224) detects the voltage, the signal holding device 2 (217) outputs the signal 1.0.

The signal switching operation in this case will be described based on the flowchart of FIG. When the computation starts, the signal level of signal holding device 1 (215) is checked in step SIOO.

Since the voltage detection device 1 (223) outputs the signal 0, the output signal of the signal holding device 1 (215) becomes 0.

Therefore, in step S100, the condition of “Signal> 0.5” is not satisfied, the determination is No, and the process proceeds to step S400.

In step S400, since the signal of the signal holding device 2 (217) is 1.0, a Yes determination is made, and the process proceeds to step S401.

In step S401, the operation command of the switch 225 in the signal is set to 1, and the process proceeds to step S300.

In step S300, since the operation command value of the signal relay switch 225 is 1, a Yes determination is made, the process proceeds to step S302, and the signal relay switch 225 is selected to be turned on.

This causes a signal relay operation.

Note that the step of the arithmetic processing based on the flowchart of FIG. 5 is repeated every ΔΤ (predetermined sample hold time of the voltage detection device 1 and the voltage detection device 2).

As described above, when voltage is applied to distribution line 45 where voltage is applied to distribution line 47, The slave station (CPE) connected to the distribution line 47 can continue to communicate with the knockbone network 1 via the distribution line 45 and the primary station 31.

[0030] As shown in FIG. 1, an MV node 100 for relaying the carrier signal may be installed between the primary station 30 and the slave station (CPE) 121 to amplify the signal. .

Further, the PLC signal switching device 180 does not require the switching switch 43 to be present. Further, the PLC signal switching device 180 is not necessarily connected to the end of the distribution line, and may be provided in the middle part of the distribution line as shown in FIG. 6 showing a modification of the present embodiment. Fig. 6 shows that the PLC signal switching device 180 is located between the position of the distribution switch 44 in front of the section switch 42 and the position of the distribution line 45 in front of the medium pressure Z low voltage transformer 62 connected to the slave station (CPE) 124. Show the case of being placed!

[0031] As described above, the PLC (power line carrier) communication system according to the present embodiment is arranged in the building of the primary station and the communication contractor located in the substation using the power line of the power system. A power line carrier communication system for performing data communication with a slave station,

Power line carrier communication with the first primary station 30 and the second primary station 31 that transmit / receive information data to / from the knockbone network 1 and the first primary station 0 via the first power line (distribution lines 44, 47). The first slave station (121) that performs power line communication with the second primary station 30 via the second power line (distribution line 45), and the first slave station 124 that performs power line carrier communication with the second primary station 30. A switching switch 43 for switching the connection state between the end on the opposite side of the primary station 1 and the end of the second power line on the opposite side of the second primary station to open or closed, and a switching switch 43 A signal coupling means (signal coupling device) that is arranged in parallel and relays the power line carrier signal between the first power line and the second power line based on the voltage detection result of the first power line and the second power line. 210, signal coupling device 214, control device 213, relay switch 225), and power line carrier signal switching device 180, and switch 43 is opened. In the state, when either the first power line or the second power line is disconnected at the part, and power line carrier communication cannot be performed between the primary station and the slave station, the power line carrier signal switching device 180 switches the switching. The power line carrier signal is relayed around the switch.

[0032] Further, the power line carrier signal switching device 180 has voltage detection devices (223, 224) for detecting operating voltages of the first power line and the second power line, and the voltage detection device is the first power line. When the signal coupling means detects that either the power line or the second power line is disconnected and a normal operating voltage is not applied, the slave station that cannot communicate with the primary station operates normally. A signal relay switch 225 is turned on to bypass the switching switch so that the power line carrier signal is relayed so that the voltage is applied and connected to the primary line and communicated with the primary station.

[0033] Also, the power line carrier communication method according to the present embodiment uses a power line of a power system to establish a communication contract corresponding to each of a plurality of primary stations arranged in a substation and the plurality of primary stations. A power line carrier communication method for performing data communication with a plurality of slave stations arranged in a person's building,

Multiple primary stations are capable of communicating with the knockbone network. Each primary station does not communicate directly with each other. In operation, a part of the power line path that carries the signal is opened and the multiple primary stations are open. When some or all of the slave stations communicate and become unable to communicate with the primary station, some or all of the slave stations can communicate with other primary stations. Switch the signal communication path so that the communication with the knockbone network continues.

[0034] Therefore, according to the power line carrier communication system or the power line carrier communication method according to the present embodiment, even if the power line (distribution line) of the system performing the power line carrier communication is in a "disconnected" state, Therefore, it is possible to continue communication with the broadband network using other power lines.

Embodiment 2.

In the first embodiment described above, the switching switch 43 is always open (open circuit), the signal relay switch 225 is provided in parallel with the switching switch 43, and the distribution line (power line) that is the PLC signal transmission medium is provided. Explained the case where PLC communication is continued by turning on signal relay switch 225 when a part of the route becomes open and communication with the primary station with which the slave station was communicating becomes impossible. .

However, when the switch 43 is in the closed (closed) state, if either the distribution line 47 or the distribution line 45 is healthy and the rated operating voltage is applied, the voltage detector 1 (223) and Each of the voltage detection devices 2 (224) detects a voltage. In this case, as shown in the flowchart of FIG. 5, since the signal relay switch opening command is issued, the signal relay switch 225 is opened and the signal is not relayed.

FIG. 7 is a diagram showing a configuration of PLC signal switching device 180 in the PLC communication system according to the second embodiment.

As a countermeasure against the problem that the signal is not relayed when the signal relay switch open command is issued, an open / close state detection device 226 for detecting the open / close state of the switch 43 is provided as shown in FIG. The open / close state is detected by an open / close state detection device 226.

FIG. 8 is a flowchart for explaining a signal switching operation in the PLC communication system according to the present embodiment.

Note that, in FIG. 8, steps denoted by the same step numbers as in FIG. 5 represent steps that perform the same processing as the steps in FIG.

In the present embodiment, step S500 is added to FIG. 5 which is a flowchart for explaining the signal switching operation in the first embodiment.

As shown in step S500, when the open / close state detection device 226 detects that the switching switch 43 is in a closed state, that is, it is detected that the switching state of the switching switch 43 is “closed” (Yes determination). ), The signal relay command is set to 1 and the signal relay switch 225 is turned on as shown in step S202.

However, if the switching switch 43 is in the on state, the PLC signal passes through the switching switch 43, so that the communication switching control cannot be performed by opening / closing the signal relay switch 225.

Therefore, in the present embodiment, as shown in FIG. 7, a PLC signal block device 260 using, for example, a low-pass filter is installed in series with the switching switch 43, and the PLC signal is transmitted via the switching switch 43. Prevent passing.

The open / close state detection device 226 of the switching switch 43 can be realized, for example, by detecting a change in the position of the switch operating mechanism unit by a switch operation by a micro switch.

[0037] As described above, the PLC communication system according to the present embodiment has the power line carrier signal block device 260 at the end of the switching switch 43 side of either the first power line or the second power line. The power line carrier signal switching device 180 is arranged in parallel with the series connection body of the switching switch 43 and the power line carrier signal block device 260, and the switching switch 43 It has an open / close state detection device 226 for detecting the open / close state of the switch, and even if the switch 43 is in the closed state, the communication path is switched to relay the power line carrier communication.

[0038] Embodiment 3.

In the first embodiment, the distribution line 47 is connected to the signal relay switch 225 via the signal coupling device 210, and the distribution line 45 is connected to the signal relay switch 225 via the signal coupling device 214.

As described above, when the signal relay switch 225 is connected to the distribution line via the signal coupling device 210 and the signal coupling device 214, a constant voltage of the distribution line, for example, a part of 20 KV is supplied to the signal relay switch 225. Since this is applied, there is a risk of continuity or damage to the switch due to a flash between the switch poles of the signal relay switch 225.

Therefore, in the present embodiment, for example, capacitance is used as the signal coupling device 210 and the signal coupling device 214, and the signal coupling device 210 and the signal coupling device 214 exhibit a high impedance value with respect to the commercial frequency, and a high frequency PLC. A low impedance value is set for the signal.

FIG. 9 is a diagram showing a configuration of the PLC signal switching device in the PLC communication system according to the third embodiment.

As shown in FIG. 9, the signal coupling device 210 of the PLC signal switching device 180 in the present embodiment has a low impedance value (for example, 1Z1000000 or less) at a commercial frequency, and a high impedance value (for example, a high frequency PLC signal) 1Z10) is grounded via a grounding device (ie, inductor) 230 using an inductor.

Similarly, the signal coupling device 214 has a low impedance value at a commercial frequency and is grounded via a grounding device (that is, an inductor) 231 using an inductor having a high impedance value for a high frequency PLC signal. .

For example, the grounding device 230 and the grounding device 231 have a low impedance value of 1Z 100000 or less of the impedance of the signal coupling device in the commercial frequency region, and the impedance of the signal coupling device of 1Z10 or more in the PLC signal frequency region. Has impedance.

[0040] Thus, the value of the voltage division ratio of the normal commercial frequency voltage applied to the signal relay switch 225 Reduce the voltage stress at all times.

Further, the signal coupling device 210 and the signal coupling device 214 can use devices with a low rated voltage, and can reduce the cost of the devices.

As described above, the signal coupling means of the PLC communication system according to the present embodiment has a low impedance value in the commercial frequency region, and has a high impedance with respect to the power line carrier signal. Therefore, it is possible to reduce the voltage stress and reduce the cost of the equipment.

[0041] Embodiment 4.

In the PLC communication system according to Embodiment 3 described above, the surge generated in the distribution line enters the inside of the PLC signal switching device 180 via the signal coupling device 214 and enters the PLC signal switching device 180. May damage the electronic circuit.

Therefore, in the present embodiment, as shown in FIG. 10, the PLC signal switching device 180 includes a surge suppression device 240 and surge suppression device such as an arrester or a discharge gear in parallel with the grounding device 230 and the grounding device 231, respectively. 241 are arranged.

As a result, when a high-frequency surge generated or propagated in the distribution line enters the PLC signal switching device via the signal coupling device, it prevents the signal coupling device from entering an overvoltage into the electronic circuit. Damage can be prevented.

As described above, in the PLC communication system according to the present embodiment, since the surge zono (arrester 240, 241) is arranged in parallel with the ground installation (inductors 230, 231), the signal coupling device is connected to the electronic circuit. Prevents overvoltage penetration and damage caused by overvoltage.

[0042] Embodiment 5.

In the first to fourth embodiments described above, the signal relay path is configured by three components, ie, two signal coupling devices (that is, the signal coupling device 210 and the signal coupling device 214) and the signal relay switch 225.

Since the signal coupling device 210 and the signal coupling device 214 originally pass high-frequency PLC signals, a combination of two components, a high-pass filter (HPF) 270 and a signal relay switch 225, as shown in FIG. It is possible to configure a signal relay route it can.

In the power line carrier communication system according to the present embodiment, instead of the signal coupling device 210 and the signal coupling device 214, a high-pass filter (HPF) 270 is disposed between the distribution line and the signal relay switch 225, thereby reducing the number of components. Can be reduced.

In addition, in FIG. 11, force is shown when a high-pass filter (HP F) 270 is disposed between the distribution line 47 and the signal relay switch 225. The high-pass filter (HPF) 270 is disposed between the distribution line 45 and the signal relay switch 225. You may arrange in.

[0043] Embodiment 6.

In the first embodiment described above, two power lines (that is, distribution lines) connected to different core pressure Z injection transformers 20 and 21 in a configuration having a plurality of primary stations (main terminals) in the substation 10. 47 and the distribution switch 45), the case where the PLC signal switching device 180 is installed in the switching switch 43 has been described, but in this embodiment, each substation has a primary station (main terminal). A description will be given of a case where the PLC signal switching device 180 is installed in the switching switch 43 arranged between two distribution lines (power lines) connected to different substations in a single configuration.

FIG. 12 is a diagram for explaining the overall configuration of the power line carrier communication system according to the present embodiment. The configuration includes a primary station (main terminal) for each substation, and two substations connected to different substations. An example in which the PLC signal switching device 1 80 is installed on the switching switch 43 arranged between the distribution lines (power lines) is shown below.

[0044] Primary station 30 installed in substation 10 passes through substation bus 40, circuit breaker 41, distribution line 44, section switch 42, branch distribution line 46, MV node 111, and low-voltage distribution line 70. Communicate with CPE121 which is a slave station.

Similarly, the primary station 32 installed in substation 11 different from substation 10 passes through substation bus 50, circuit breaker 51, distribution line 52, branch distribution line 53, MV node 112, and low voltage distribution line 73. Communicates with the slave station CPE123.

The primary station 32 installed in the substation 11 communicates with the backbone network 1 via the network communication line 4. The transformer 20 connected to the substation bus 40 of the substation 10 is connected to the upper power system A (5), and the transformer 22 connected to the substation bus 50 of the substation 11 is Connected to upper power grid B (6)!

The distribution line 44 of the substation 10 is connected to the distribution line 47 via the section switch 42.

The distribution line 47 and the distribution line 52 of the substation 11 are interconnected by the switching switch 43, but in the normal operation state, the switching switch 43 is open, and the two distribution lines 47 and the distribution line 52 are It is in an electrically disconnected state.

The PLC signal switching device 180 has two connection lines (two) and is connected in parallel with the switching switch 43.

The configuration of the PLC signal switching device 180 is basically the same as that of the PLC signal switching device described in the first embodiment (see FIGS. 2 and 3). The PLC signal switching device 180 in the present embodiment is Signal coupling device 210 connected to distribution line 47, signal coupling device 214 connected to distribution line 47, signal relay switch 225 connected to signal coupling devices 210 and 214, voltmeter 1 (220), voltmeter 2 (221) The voltage detection device 1 (223), the voltage detection device 2 (224), and a control device 213 that opens and closes the signal switch 225 in response to a signal from the voltage detection device.

Next, the operation of the PLC communication system according to the present embodiment will be described with reference to FIG. 2, FIG. 3, and FIG.

As shown in Figure 12, when the two power lines (i.e., distribution line 47 and distribution line 52) are healthy and the power is supplied normally, the rated operating voltage is applied to power line 47 and power line 52. Has been.

Voltmeter 1 (220) measures the voltage of power line 47 and outputs the measured voltage value.

In the voltage detection device 1 (223), the output of the voltmeter 1 (220) is set to a set value (for example, 9

If it is greater than (0%), it is determined that the route to substation 10 is normal and a signal (for example, 1)

. 0) is output.

Similarly, the voltmeter 2 (221) measures the voltage of the power line 52 and outputs the measured voltage value. Voltage detector 2 (224) determines that the path to substation 11 is normal when the output of voltmeter 2 (221) is greater than the set value (for example, 90% of the rated voltage value). , Signal (e.g. 1. Output o).

[0047] When the signal of the voltage detection device 1 (223) is output, the signal holding device 1 (215) of the control device 213 outputs an output of a certain magnitude, for example, 1 for η Χ ΔΤ time. .

Here, ΔΤ is the sample hold time of the voltage detection device 1 (223) and the voltage detection device 2 (224). N is a value of 2 or more. Similarly, when the signal of the voltage detection device 1 (224) is output, the signal holding device 1 (217) of the control device outputs an output of a certain magnitude, for example, 1 for ηΧΔΤ time.

The signal presence / absence check device 216 checks the output levels of the signal holding device 1 (215) and the signal holding device 2 (217).

If the output of the signal holding device 1 (215) is a specified value, for example, 0.5 or more, the switch operation command value in the signal is set to 0.

Even if the output of the signal holding device 2 (217) is a specified value, for example, 0.5 or more, the command value is 0 if the output of the signal holding device 1 (215) is a specified value, for example, 0.5 or more. It is.

[0048] On the other hand, if the output of the signal holding device 1 (215) is less than or equal to a specified value and the output of the signal holding device 2 (217) is a specified value, for example, 0.5 or more, the signal relay device operation command value is The signal relay command device 218 set to 1 checks the relay command value of the signal presence / absence check device 213 every ΔΤ, and if it is less than the specified value (for example, 0.5), the signal relay switch 225 is opened. On the other hand, the signal relay device 225 is turned on (closed) if the value is a specified value (for example, 0.5) or more.

If both line voltages are detected, both primary stations 30 and 31 are judged to be healthy, and the signal relay switch 225 is not turned on (closed). Therefore, the signal of the primary station 30 is transmitted to the distribution line 47 and is not transmitted to the distribution line 52.

Similarly, the signal of the primary station 31 is transmitted to the distribution line 52, but not transmitted to the distribution line 47, and communication is performed between each primary station and the slave station.

The flow of the PLC signal switching operation in the present embodiment described above is basically the same as the operation flow of the flowchart shown in FIG.

[0049] As described above, in the PLC communication system according to the present embodiment, even when a plurality of primary stations (first and second primary stations) are arranged in different substations, the switching switch 43 is opened. In the state, when either the first power line or the second power line is partially disconnected and power line carrier communication cannot be performed between the primary station and the slave station, the power line carrier signal switching device 180 Thus, the power line carrier signal can be relayed bypassing the switching switch 43.

[0050] Embodiment 7.

In Embodiment 6 described above, each substation has a primary station (main terminal), and the PLC signal switching device 43 is connected to the switch 43 placed between two power lines connected to different substations. In the present embodiment, a description will be given of the case where the section switch is opened in the middle of the distribution line and opened.

FIG. 13 is a diagram for explaining the overall configuration of the power line carrier communication system according to the present embodiment. As shown in the figure, it is assumed that the circuit breaker 41 is open for accident removal operation of the distribution line 44, and that the section switch 42 between the distribution lines 44 and 47 is also open. Since the distribution line 44 and the distribution line 47 are in an electrically disconnected state, the PLC signal cannot be transmitted between the distribution line 44 and the distribution line 47.

Therefore, as shown in the figure, by installing a signal bypass device (for example, bypass filter) 251 in parallel with the section switch 42, the PLC signal of the primary station 32 reaches the slave station (CPE) 122, and the slave station (CPE) 122 can communicate with backbone network 1.

[0051] As described above, in the PLC communication system according to the present embodiment, when the accident occurs in the power system, the section switch 42 for separating the section where the accident has occurred from the healthy section is the first power line. Alternatively, when placed on the second power line, the signal bypass device 251 is provided in parallel with the section switch 42, so even if the section switch 42 is open, the section line 42 is bypassed to bypass the power line. The carrier signal can be relayed.

Industrial applicability

[0052] The present invention relates to a power line carrier capable of continuing communication with a broadband network using a power line of another system even when the power line of the system performing the power line carrier communication is in a "disconnected" state. This is useful for realizing a communication system.

Claims

The scope of the claims

[1] A power line carrier communication system that performs data communication between a primary station installed in a substation and a slave station installed in a communication contractor's building using a power line of an electric power system. A first primary station and a second primary station that transmit and receive information data to and from the bone network;

A first slave station that performs power line carrier communication with the first primary station via a first power line; and a second slave station that performs power line carrier communication with the second primary station via a second power line. And switching the connection state between the end of the first power line opposite to the first primary station and the end of the second power line opposite to the second primary station to open or closed A power line carrying signal is arranged between the first power line and the second power line based on a voltage detection result of the first power line and the second power line, arranged in parallel with the switch and the switching switch. A power line carrier signal switching device having signal coupling means for relaying, and when the switching switch is in an open state, either the first power line or the second power line is partially disconnected, and the primary station If power line carrier communication is not possible between

The power line carrier communication system, wherein the power line carrier signal switching device relays a power line carrier signal bypassing the switching switch.

[2] The power line carrier signal switching device includes a voltage detection device that detects an operating voltage of the first power line and the second power line, and the voltage detection device is the first power line or the first power line. When the signal coupling means detects that one of the power lines 2 is disconnected and no normal operating voltage is applied, the normal operating voltage is applied to the slave station that cannot communicate with the primary station. The power line carrier signal is relayed by turning on a signal relay switch to bypass the switching switch so that it can communicate with the primary station connected to the power line. Power line carrier communication system.

[3] A power line carrier signal block device is disposed at an end of the switching switch side of either the first power line or the second power line,

The power line carrier signal switching device includes the switching switch and the power line carrier signal block. And an open / closed state detection device that detects the open / closed state of the switching switch, and switches the communication path even when the switching switch is in the closed state. The power line carrier communication system according to claim 2, wherein the power line communication system according to claim 2 can be relayed.

[4] The signal coupling means is characterized in that the signal coupling means has a low impedance value with respect to a commercial frequency region and is grounded by a grounding installation having a high impedance with respect to the power line carrier signal. 2. The power line carrier communication system according to 2.

5. The power line carrier communication system according to claim 4, wherein a surge sover is arranged in parallel with the ground installation.

6. The power line carrier communication system according to claim 2, wherein the signal coupling means includes a signal relay switch and a high-pass filter connected in series with the signal relay switch.

7. The power line carrier communication system according to any one of claims 1 to 6, wherein the first primary station and the second primary station are arranged in different substations.

[8] When a section switch is installed on the first power line or the second power line to separate the section where the accident has occurred from the healthy section when an accident occurs in the power system, the section 8. The power line carrier communication system according to any one of claims 1 to 7, wherein a signal bypass device is provided in parallel with the switch.

9. The power line carrier communication system according to any one of claims 1 to 8, wherein a carrier frequency of the power line carrier signal is about 1ΜΗζ to 50ΜΗζ.

[10] Using the power lines of the power system, there are a plurality of primary stations arranged in the substation, and a plurality of slave stations arranged in the telecommunications subscriber's building corresponding to each of the plurality of primary stations. Power line carrier communication method for data communication between

The plurality of primary stations communicate with the backbone network, but each primary station does not perform direct communication. In operation, a part of the power line path carrying the signal is opened and the plurality of primary stations are opened. When some or all of the slave stations communicate and become unable to communicate with the primary station, some or all of the slave stations can communicate with other primary stations. Switch the signal communication path to communicate with the backbone network The power line carrier communication method characterized by continuing.