JP2005123960A - Communication system using dc electromotive cable and dc electromotive cable communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a DC electromotive cable communication system using a DC electromotive cable as a transmission line for communication without laying a communication line. <P>SOLUTION: In the DC electromotive cable communication system making a DC electromotive cable 2 and the ground a signal transmission line, the system comprises a coupling circuit 11 for cutting off a high voltage and transmitting a signal of a frequency band optimal for cable communication in both a signal transmitting side apparatus and a signal receiving side apparatus, a DC electromotive cable communication apparatus 12 is connected to each of the coupling circuits 11, and further, a DC power source 13 for generating a circuit power source by extracting an AC higher harmonic component included in the DC electromotive cable is provided to the signal receiving side apparatus, thereby mutually performing transmission/reception. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a communication system and a DC feeder communication device in a railway line. The present invention particularly relates to a communication system using a DC feeder for supplying electric power from a substation to a train line as a communication line, and a DC feeder communication apparatus constituting the communication system.

  The present invention relates to a remote monitoring system necessary for train operation, a remote control system necessary for train operation, a data transmission system necessary for train operation, a DC feeder that can be used for a data communication system between facilities in the vicinity of a track, etc. The present invention relates to a communication system using as a communication line.

  Conventionally, remote monitoring and control systems aimed at ensuring the safety of train operations and maintenance of facilities have been using dedicated communication lines for collecting status information and remote control of equipment in remote locations. .

  For example, an AC BT feeder circuit failure point that determines the distance from a substation of a short-circuit (fault) point between a trolley wire and a negative wire or rail that occurs in an AC BT (suction transformer) feeder circuit in a railway In the orientation device, it has been proposed to correctly locate the failure point using a dedicated communication line (see, for example, Patent Document 1).

  Further, in a communication network that transmits control commands and data between a railway power management apparatus and a controlled location, a railway power control management system in which communication apparatuses are connected by a network transmission path has been proposed (for example, Patent Documents). 2).

  Furthermore, in a fixed blockage system that avoids collisions and rear-end collisions between trains, control for feeder fixed block systems to avoid train collisions and rear-end collisions on railway lines connecting substations and power control stations with dedicated communication lines A device has been proposed. Here, there is a communication line between power control stations or between the power control station and the substation, communication in both directions is possible, and the substation monitors the state of train movement with the communication line. In the event of an accident, it has been proposed to give instructions to the train. (For example, refer to Patent Document 3).

  An outline of a configuration of a communication system in a conventional railway facility will be described with reference to FIG. In a conventional communication system, a communication device (parent station) 92 provided in a station substation or the like is connected from a central device 90 provided in an electric power district or the like via a communication line 91, and the parent station 92 via a communication line 93 is connected. Communication devices (slave stations) 94-1 to 94-n provided in the devices along the track are connected, and the slave stations 94-1 to 94n are connected to various facilities via the communication lines 95-1 to 95-n, respectively. 96-1 to 96-n are connected. In other words, railway facilities are equipped with a state monitoring system for maintenance and management of facilities laid along the railway line, and various facilities (for example, cable failure detection, transformer secondary voltage, dielectric breakdown, switches, drainage pumps) Etc.) The status information of 96-1 to 96-n is sent to the master station 92 where the slave stations 95-1 to 95-n are installed in station substations and other electrical rooms via communication lines 94-1 to 94-n. Collected and sent to the central unit 90.

  Such a communication system requires a dedicated communication line 93 between the master station 92 and the slave stations 94-1 to 94n in spite of communication with a relatively small amount of information. There is a problem that the effect is low.

Japanese Patent No. 3370877 JP 2001-191822 A Japanese Examined Patent Publication No. 6-81366

  An object of the present invention is to construct a DC feeder communication system using a DC feeder as a communication transmission line without laying a communication wire.

  In order to solve the above problem, the present invention uses a DC feeder, which is a train power line, as a communication line. That is, the present invention is a DC feeder communication system in which a signal transmission path is between a DC feeder and the ground, and a high voltage is cut off at both the signal transmission side device and the signal reception side device, and the optimum frequency for the DC feeder communication. Coupling circuits that transmit the band signals were installed, and DC feeders were connected to each coupling circuit to transmit and receive each other.

  In the above communication system, the present invention extracts an AC component contained in a DC feeder, rectifies it to create a circuit power supply, and constitutes a DC feeder communication system that does not require a commercial power supply.

  Furthermore, the present invention provides a DC feeder communication system that takes out the harmonic component contained in the DC feeder and uses it as a synchronization signal source necessary for the DC feeder communication system.

  The present invention relates to a DC feeder communication apparatus that constitutes a DC feeder communication system that uses a DC transmission line and the ground as a signal transmission line, and is connected to the DC feeder to cut off the DC voltage and is the optimum frequency for the DC feeder communication. A coupling circuit that transmits the band signal and a DC feeder communication device that communicates using a DC feeder after the coupling circuit are provided.

  The DC feeder communication device includes a harmonic extraction means for extracting an AC harmonic component of the DC feeder and a rectifier circuit that rectifies the extracted harmonic. The DC feeder communication device further includes a synchronization signal generation circuit that extracts an AC harmonic component of the DC feeder and generates a synchronization signal.

  In the present invention, since a coupling circuit that cuts off the high voltage is installed on both the transmission side and the reception side, and a DC feeder communication device is connected to each, an existing DC feeder can be used as a communication line. It is possible to construct a communication system capable of remotely monitoring and controlling devices without laying a dedicated communication line.

  Hereinafter, a communication system using a DC feeder according to the present invention will be described with reference to the drawings. First, a method for supplying power to an electric vehicle will be described with reference to FIG. There are cases where electric power is supplied to the electric vehicle from a substation by direct current (direct current feeding method) and when alternating current is fed (AC feeding method). In the DC feeding system, an extra high voltage (for example, 66 kV) transmission line from an electric power company is received at an electric railway substation 7 installed at intervals of several kilometers, and converted into an appropriate voltage (AC 1200 V) by a transformer 71. It is converted into a direct current (DC 1500 V) by a rectifier 72 using silicon or thyristor, and is fed to the trolley wire 3 through the direct current feeder 2. The electric power supplied to the electric vehicle 65 returns to the substation 7 via the rail 4.

  An outline of a configuration of a communication system using a DC feeder in such a DC feeding system will be described with reference to FIG. The communication system using this DC feeder is connected to a communication device (a communication device) via a coupling circuit 11 serving as a high-pass filter that attenuates a high-voltage DC component and passes a signal frequency component for communication between the DC feeder 2 and the ground. DC communication line communication device) 12 is connected, and a DC voltage is supplied to the communication device 12 from a power source 13. The coupling circuit 11 includes a DC blocking capacitor 111 and a DC blocking capacitor 112 connected in series, and a reactance 113 connected between the connection point of both capacitors and the ground. The communication device 12 includes a transmission circuit 121, a reception circuit 122, a control circuit 123, and a power circuit 124. The DC blocking capacitors 111 and 112 block a DC high voltage and transmit signals in a frequency band optimal for DC feeder communication.

  The configuration of the power supply 13 in the communication system of the present invention will be described with reference to FIGS. A DC voltage obtained by full-wave rectification of the three-phase AC is applied to the DC feeder. As shown in FIG. 2A, power source harmonics are superimposed on this DC voltage. The power supply harmonic is 300 Hz when the AC power supply is 50 Hz. The spectrum of the full-wave rectified waveform is superimposed with 6th, 12th, and 18th harmonic components as shown in FIG. According to the present invention, a DC power line communication device can be operated without requiring a commercial power source by extracting an AC component which is a power source harmonic to create a circuit power source.

  This DC feeder communication device can be used for both a communication device provided on the substation side and a facility-side communication device provided along the line in the DC feeding system shown in FIG.

  FIG. 3 shows a first example of a DC power source that generates a DC power source from a DC feeder. This DC power supply 13 includes a DC blocking capacitor 131 connected to the DC feeder 2, an insulation transformer 132 having one end of the primary winding connected to the capacitor 131, and a secondary winding of the insulation transformer 132. The connected full-wave rectifier circuit 133, a smoothing capacitor 134 that smoothes the output of the full-wave rectifier circuit 133, and a DC / DC converter 135 that converts the voltage across the terminals of the smoothing capacitor 134 into a predetermined DC voltage. . An AC component is extracted from the DC feeder 2 via the capacitor 131, and circuit power necessary for the communication device 12 is generated by the insulating transformer 132, the full-wave rectifier circuit 133, the smoothing capacitor 134, and the DC / DC converter 135. The output voltage of the DC / DC converter 135 is supplied to the power supply circuit 124 of the communication device 12.

  The 2nd example of the DC power supply which produces | generates DC power supply from a DC feeder is shown using FIG. This DC power supply 13 shares the DC power supply 13 and the DC blocking capacitor of the coupling circuit 11 in common. The DC power supply 13 is connected to a DC blocking capacitor 131 connected to the DC feeder 2, an insulation transformer 132 having one end of a primary winding connected to the capacitor 131, and a secondary winding of the insulation transformer 132. The full-wave rectifier circuit 133, the smoothing capacitor 134 that smoothes the output of the full-wave rectifier circuit 133, and the DC / DC converter 135 that converts the voltage across the smoothing capacitor 134 into a predetermined DC voltage. Further, the output of the DC blocking capacitor 131 is supplied to the transmission circuit 121 and the reception circuit 122 of the communication device 12 via the high pass filter 136.

  Thus, the circuit can be simplified by using the DC blocking capacitor 131 in common for the coupling circuit 11 and the DC power supply 13.

  The example of the circuit which extracts the harmonic component of a DC feeder and produces | generates the synchronizing signal which synchronizes a system is demonstrated using FIG. In this example, an AC component is extracted from the DC feeder 2 via the DC blocking capacitor 131, and only a necessary frequency component is extracted by the narrow band-pass filter 125. In this example, the power supply circuit 124 and the DC power supply 13 of the communication device 12 are not shown. Further, the control circuit 123 of the communication device 12 includes a PLL (phase locked loop) circuit 126 shown in FIG. 6 and a pulse circuit 127 shown in FIG. 7, but the illustration is omitted.

  As shown in FIG. 6, the specific frequency signal extracted from the harmonic component by the narrow-band bandpass filter 125 is used as a signal source of the PLL circuit 126 of the communication device 12, and the modulation circuit 1211 of the transmission circuit 121 in communication or A method for generating a synchronization signal of the demodulation circuit 1221 of the reception circuit 122 or a drive signal for the pulse circuit 127 of the communication device 12 as shown in FIG. It can be applied to various uses such as a method of using a common timer for performing time sharing.

The figure explaining the structure of a direct current feeder communication apparatus. The figure explaining the voltage of a DC feeder. The figure explaining the structure of the power supply circuit which produces | generates DC power supply from a DC feeder. The figure explaining the structure of the power supply circuit which produces | generates DC power supply from a DC feeder. The figure explaining the structure of the circuit which extracts a power supply harmonic component from a DC feeder, and produces | generates a synchronizing signal. The figure explaining the example which extracts a power supply harmonic component and uses it as the synchronous signal of modulation / demodulation. The figure explaining the example which extracts a power supply harmonic component and uses it as the timer for systems. The figure explaining the structure of the conventional equipment monitoring system. The figure explaining a DC feeder method.

Explanation of symbols

2: DC feeder 3: Trolley wire 4: Rail 5: Electric car 7: Substation 11: Coupling circuit 12: Communication device (DC feeder communication device)
13: DC power supply 71: Transformer 72: Rectifier 121: Transmission circuit 122: Reception circuit 123: Control circuit 124: Power supply circuit 125: Narrow-band bandpass filter 126: PLL circuit 127: Pulse circuit 131: DC blocking capacitor 132: Insulation transformer 133: Full-wave rectifier 134: Smoothing capacitor 135: DC / DC converter 136: High-pass filter for communication

Claims (6)

In a DC feeder communication system that uses a DC transmission line and the ground as a signal transmission path,
A coupling circuit that cuts off the high voltage and transmits the signal in the optimal frequency band for DC feeder communication is installed on both the signal transmission device and the signal reception device
A DC feeder communication system, characterized in that a DC feeder communication device is connected to each coupling circuit to transmit and receive each other. In the DC feeder communication system according to claim 1,
A DC power line communication system characterized in that an AC component contained in a DC power line is taken out and rectified to create a circuit power supply. In the DC feeder communication system according to claim 1,
A DC feeder communication system, wherein a harmonic signal contained in a DC feeder is extracted to generate a synchronization signal necessary for the system. In a DC feeder communication device constituting a DC feeder communication system using a DC feeder and the ground as a signal transmission path,
A coupling circuit that is connected to a DC feeder and cuts off the DC voltage and transmits a signal in a frequency band optimal for DC feeder communications;
A DC feeder communication device comprising a communication device that communicates using a DC feeder after the coupling circuit. In the DC feeder communication device according to claim 4,
Harmonic extraction means for extracting the AC harmonic components of the DC feeder,
A DC feeder communication device comprising: a rectifier circuit that rectifies the extracted harmonics. In the DC feeder communication device according to claim 4,
A DC feeder communication apparatus comprising a synchronization signal generation circuit that extracts an AC harmonic component of a DC feeder and generates a synchronization signal.

Images