JP2006234544A - Time synchronizer of supervisory control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate time synchronization in a supervisory control system for supervising and controlling power equipment. <P>SOLUTION: The time synchronizer for a supervisory control system comprises a time synchronization signal transmitting device 6 connected to the control circuit of the supervisory control system for supervising and controlling power equipment, and time synchronization signal receiving devices 9, each of which is connected to a plurality of control devices 7 and a supervisory device 8 of the control circuit. The time synchronization signal transmitting device 6 receives a time signal from a GPS, calculates a delay time the time signal propagates by the control circuit, adds a trigger for deciding to be a time synchronization signal to the time signal, and allows the time synchronization signal to be superimposed and transmits it to the control circuit. The plurality of time synchronization signal receiving devices 9 receive the time synchronization signal simultaneously, extract time data from the time synchronization signal, correct the delay time from the time data, and update the time in the control devices 7 and the supervisory device 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a time synchronization apparatus of a monitoring control system that can facilitate time synchronization in a monitoring control system that monitors and controls the operating state of power equipment such as industry, traffic, buildings, and public facilities.

  Conventionally, time synchronization of this type of monitoring and control system has been performed by transmitting a time synchronization signal from a device that is a source of time synchronization using a transmission path that transmits information such as an operation state between power facilities. Then, in the device that has received the time synchronization signal, if it is determined as the time synchronization signal, the time of its own device is matched with the time of the time synchronization source.

In addition, the time synchronization signal is transmitted and received using a dedicated signal line, and the time of the time synchronization source and the time of the own apparatus are matched (for example, refer to Patent Document 1).
JP 2004-272403 A (pages 3 to 4, FIG. 1)

  The above conventional time synchronization has the following problems.

  In the case of transmitting and receiving time synchronization signals using a transmission line, the time synchronization signal is superimposed on the transmission line in addition to information signals such as the operating status of the power equipment. Had to prepare the software. Further, when a failure has occurred in the transmission line due to a failure of the power facility, the time synchronization signal itself could not be transmitted or received.

  On the other hand, in the case of transmitting and receiving using a dedicated signal line, the signal line has to be wired between the device that is the source of time synchronization and the device that receives the time synchronization signal. If there are a plurality of devices for receiving the time synchronization signal, the number of signal lines is also increased, which is complicated.

  Time synchronization is important because it requires a highly accurate time of μs order to ms order in failure analysis or accident analysis of electric power equipment. For this reason, there has been a demand for a supervisory control system capable of easily transmitting a highly accurate time without requiring unique software or a dedicated signal line.

  The present invention has been made to solve the above problem, and an object of the present invention is to provide a time synchronization apparatus of a monitoring control system that can facilitate time synchronization.

  In order to achieve the above object, a time synchronization apparatus of a monitoring control system according to the present invention includes a time synchronization signal sending apparatus connected to a control circuit of a monitoring control system for monitoring and controlling power equipment, and a plurality of the control circuits. A time synchronization signal receiving device connected to each of the control device and the monitoring device, wherein the time synchronization signal sending device receives a time signal from GPS, and between the time synchronization signal sending device and the time synchronization signal receiving device. And calculating a delay time for propagation of the time signal, adding a trigger for determining the time synchronization signal to the time signal, transmitting the time synchronization signal superimposed on the control circuit, and receiving the plurality of time synchronization signals. An apparatus that simultaneously receives the time synchronization signal, extracts time data from the time synchronization signal, corrects the delay time from the time data, and And updates the time in the monitoring device.

  According to the present invention, a highly accurate time obtained from GPS is superimposed on a control circuit in a monitoring control system that monitors and controls power equipment as a time synchronization signal, and this time synchronization signal is superposed on a plurality of control devices and monitoring devices. Since the reception is performed simultaneously by the device, the times of the plurality of control devices and the monitoring device can be easily synchronized at a highly accurate time.

  Embodiments of the present invention will be described below with reference to the drawings.

  A time synchronizer of a supervisory control system according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing the configuration of a monitoring control system for power equipment according to an embodiment of the present invention, FIG. 2 is a flowchart of a time synchronization signal sending device of the monitoring control system according to an embodiment of the present invention, and FIG. FIG. 4 is a circuit diagram of the time synchronization signal receiving apparatus of the monitoring control system according to the embodiment of the present invention. FIG. 4 is a flowchart of the time synchronization signal receiving apparatus of the monitoring control system according to the embodiment of the present invention.

  As shown in FIG. 1, a monitoring control system for power equipment such as industry, traffic, buildings, and public facilities includes a power equipment unit 1 a that receives power from an electric power company and supplies power to a load, and monitoring control that monitors and controls an operating state. Part 1b.

  The power equipment section 1a is provided with a main transformer 3 connected to a power source 2 from an electric power company. A plurality of power facilities 4 having switches and the like are connected to the secondary side of the main transformer 3 to supply power to the loads.

  The supervisory control unit 1 b is provided with a local transformer 5 connected to the secondary side of the main transformer 3. On the secondary side of the local transformer 5, there are a time synchronization signal sending device 6 that transmits a time synchronization signal, a plurality of control devices 7 that are paired with a plurality of power equipments 4 to control the operation state, and these control devices. 7 and a time synchronization signal receiving device 9 for receiving a time synchronization signal provided in each of the plurality of control devices 7 and the monitoring device 8 are connected.

  Here, the time synchronization device for matching the times in the supervisory control system includes a time synchronization signal sending device 6 and a time synchronization signal receiving device 9. Further, the control device 7 and the monitoring device 8 including the time synchronization device on the secondary side of the local transformer 5 constitute a control circuit related to time synchronization of the monitoring control system.

  Next, a method of transmitting a time synchronization signal by the time synchronization signal transmission device 6 that is a source of time synchronization will be described with reference to FIG.

  As shown in FIG. 2, first, a highly accurate time signal is received from the GPS (st1). Next, a time delay between the time synchronization signal sending device 6 and the time synchronization signal receiving device 9 is calculated (st2). That is, since the time synchronization signal sending device 6 and the time synchronization signal receiving device 9 are connected by a control wiring of several m to several hundreds m, the delay or deviation of the time signal propagating through this control wiring is obtained. Since this differs depending on the thickness, material, and length of the control wiring, a delay time in which the time signal propagates is obtained in advance when the control wiring is installed. Then, the delay time data can be made to correspond to each time synchronization signal receiving device 9.

  Then, a trigger for determining the time data is added to the time synchronization signal having the delay time data (st3). Thus, a time synchronization signal having a highly accurate time from the GPS is obtained. Next, if the secondary side voltage of the local transformer 5 is normal (Y) within a predetermined value range (st4), the timing is adjusted (st5), and the time synchronization signal is superimposed on the voltage of the control circuit. And output (st6). If the voltage is not normal (N), the process returns to the time delay calculation (st2).

  Here, the timing adjustment is to prevent the time synchronization signal from being coincident with the voltage cycle of the secondary side of the on-site transformer 5 and to prevent the time synchronization signal from being superimposed on the voltage zero point. It is to make it easy. Further, the transmission of the time synchronization signal is repeatedly performed at intervals of several ms to several hours by individual monitoring control systems.

  Next, a method of receiving the time synchronization signal in the time synchronization signal receiving device 9 will be described with reference to FIGS.

  As shown in FIG. 3, the time synchronization signal receiver 9 includes a time synchronization signal extraction circuit 11 that extracts a time synchronization signal, a waveform storage medium 12 that stores a time synchronization signal, and a time extracted by the time synchronization signal extraction circuit 11. A time synchronization signal determination circuit 13 that determines a synchronization signal, a time synchronization setting circuit 14 that sets the time obtained from the time synchronization signal as the time of the monitoring control system, and a time storage medium 15 that stores the time. .

  The time stored in the time storage medium 15 is connected to the event circuit 16 that records the operating state of the power equipment 4. The event circuit 16 has an input circuit 17 to which the voltage and current of the power equipment 4 are input, an output circuit 18 that outputs a switching command for a switch in the power equipment 4, and the voltage and current obtained from the input circuit 17. Are composed of a logic circuit 19 for judging an accident, a failure, and the like, and an event log 20 for recording these events together with time. The event circuit 16 is provided in the time synchronization signal receiving device 9 or in the control device 7 and the monitoring device 8.

  Next, a method until the time synchronization signal receiving device 9 receives the time synchronization signal and stores the time will be described.

  As shown in FIG. 4, when the time synchronization signal receiver 9 receives the time synchronization signal (st11), first, the presence or absence of the power supply voltage is determined (st12). If the voltage on the secondary side of the local transformer 5 is within the predetermined value range (Y), the time synchronization signal is stored in the waveform storage medium 12 (st13). The reception of the time synchronization signal is performed simultaneously by the plurality of control devices 7 and the monitoring device 8. If the voltage on the secondary side of the local transformer 5 is outside the predetermined value (N), it returns to the original state due to an abnormality or failure in the supervisory control system.

  Next, a time synchronization signal is extracted (st14). This is to extract the time synchronization signal in consideration of noise, voltage fluctuation and the like superimposed on the time synchronization signal. For example, the waveform stored in the waveform storage medium 12 and the time synchronization signal extraction circuit 11 By comparing the current waveform and calculating the difference, the time synchronization signal can be extracted.

  When the time synchronization signal is extracted, the signal is determined (st15). If it is a time synchronization signal (Y), time data is extracted (st16). If it is not the time synchronization signal (N), the process returns to before the time synchronization signal extraction (st14).

  When the time data is extracted, the deviation in each time synchronization signal receiver 9 is corrected from the delay time obtained in advance (st17). The corrected time is a highly accurate time obtained from GPS, and if there is a difference from the time in the time synchronization setting circuit 14, it is updated (st18) and stored (st19).

  By obtaining time with high accuracy in this way, the operating state of the power equipment 4 can be monitored and controlled at time with high accuracy. In particular, overvoltage and overcurrent at the time of a failure or accident often change suddenly in the order of μs to ms, and it is useful for failure analysis and accident analysis that these changes over time can be obtained at a highly accurate time. . Further, for the addition of the power equipment 4 and the control device 7, it is only necessary to provide the time synchronization signal receiving device 9, and it is not necessary to add a signal line, and the time synchronization can be easily performed.

  According to the time synchronization device of the monitoring control system of the above embodiment, the time obtained by GPS is superimposed on the control circuit in the power facility by the time synchronization signal sending device 6 and provided in the plurality of control devices 7 and monitoring devices 8. Since each time synchronization signal receiver 9 receives the signals simultaneously, there is no need for a dedicated transmission line or signal line for performing time synchronization, and the monitoring control system can be easily operated at a high precision time. Can be synchronized.

The figure which shows the structure of the monitoring control system of the electric power equipment which concerns on the Example of this invention. The flowchart figure of the time synchronous signal transmission apparatus of the monitoring control system which concerns on the Example of this invention. The circuit diagram of the time synchronous signal receiver of the supervisory control system which concerns on the Example of this invention. The flowchart figure of the time synchronous signal receiver of the supervisory control system which concerns on the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Power equipment part 1b Monitoring control part 2 Power supply 3 Main transformer 4 Power equipment 5 On-site transformer 6 Time synchronization signal sending device 7 Control device 8 Monitoring device 9 Time synchronization signal receiving device 11 Time synchronization signal extraction circuit 12 Waveform storage medium 13 Time synchronization signal determination circuit 14 Time synchronization setting circuit 15 Time storage medium 16 Event circuit 17 Input circuit 18 Output circuit 19 Logic circuit 20 Event log

Claims (3)

A time synchronization signal sending device connected to a control circuit of a monitoring control system for monitoring and controlling electric power facilities;
A time synchronization signal receiving device connected to each of a plurality of control devices and a monitoring device of the control circuit,
The time synchronization signal sending device receives a time signal from GPS,
Calculating a delay time in which the time signal propagates between the time synchronization signal transmitting device and the time synchronization signal receiving device;
Add a trigger to determine the time synchronization signal to the time signal,
Transmit the time synchronization signal superimposed on the control circuit,
The plurality of time synchronization signal receiving devices simultaneously receive the time synchronization signal;
Extract time data from the time synchronization signal,
Correcting the delay time from the time data,
A time synchronization apparatus for a monitoring control system, wherein the time in the control apparatus and the monitoring apparatus is updated.   2. The time synchronization signal is transmitted from the time synchronization signal transmission device and received by the time synchronization signal reception device when the voltage of the control circuit is within a predetermined value range. The time synchronizer of the monitoring control system of description.   The time synchronization apparatus of the monitoring control system according to claim 1 or 2, wherein an event at the time of the failure of the electric power facility or an accident is recorded at the time updated by the time synchronization signal reception apparatus.

Images