JPH09222445A - Monitoring and control device of power system, and oscillographed waveform data collection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the processing load by simplifying the transmission type of LAN in collecting the oscillographed waveform data in a monitoring and control device of the power system. SOLUTION: An LANI/F is 17 master stations and each control terminal is a slave station, and the information is transmitted to each other with the prescribed period so as to give the control command while monitoring the system condition between a monitoring and control computer 10 and control terminals 151-15n. The freezing request of the oscillographed waveform data is contained in the information indicated by the master stations to transmit the reference time and the control command. The accident information such as CB trip is contained in the terminal status information front the slave station when the oscillographed waveform data are collected. The master station transmits the freezing request to the slave station when the accident information is recognized in the status, and the respective control terminals 151-15n freeze the data in the buffer area corresponding to the prescribed freezing time at one time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supervisory control device for a power system, and more particularly to collecting oscillographic waveform data for recording voltage and current waveform data of each facility at an electric power plant and an operating condition of a protective device when a system fault occurs. Regarding the scheme.

[0002]

2. Description of the Related Art The collection of oscilloscope waveform data in a power system is performed by taking in voltage and current waveforms and operating conditions from instrument transformers and protective devices installed at the site of each electric station, and monitoring and controlling rooms where operators are located. To constantly monitor and monitor
The voltage and current waveforms are printed out using the relay operation and voltage fluctuations caused by an accident as triggers.

For example, in the control system described in Japanese Patent Application Laid-Open No. 2-101983, a supervisory control computer and an automatic oscilloscope are connected via a LAN, and the former collects various information and manages synchronization of distributed devices (control terminals). Including the device control, the latter collects information when an accident occurs, requests the distribution device to freeze the waveform data, and stores the waveform data after the freeze is completed.

[0004]

In the above-mentioned prior art, an accident occurring in the power system is doubly monitored by the supervisory control computer and the automatic oscilloscope device.
The transmission of accident information via the network becomes complicated. In addition, since the automatic oscilloscope needs the function of accident detection and freeze request,
The configuration becomes complicated and the cost becomes high. Furthermore, the automatic oscilloscope device continuously sends data freezing requests to all distributed devices during the accident, while the supervisory control computer constantly sends time information for synchronous management of the distributed devices. Since the transmission of status change data of each equipment due to a system fault is added to this, the transmission load of the LAN during the fault increases and there is a possibility that the required processing speed cannot be secured.

An object of the present invention is to provide a supervisory control system for a power system and an oscilloscope waveform collection method which overcome the problems of the prior art and enable simplification of transmission on a LAN and simplification of an oscilloscope device. Especially.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made by paying attention to the fact that the collection of oscilloscope waveform data including the freezing process is carried out by utilizing the normal information transmission function of the power system supervisory control device. For the above purpose, oscilloscope waveform data is always taken in from the control terminal connected to the local area LAN at the power station, and the operation information of the protective device that operates at the time of a system accident is used as a trigger to take in all the control terminals all at once. This is achieved by making a request to freeze the oscilloscope waveform data.

The power system supervisory control apparatus of the present invention periodically takes in the voltage and current of each electric station and the status change of the protective device from a plurality of control terminals to the supervisory control computer via the network, and the power control system A device for monitoring and controlling,
The control terminal has a cycle buffer that cyclically buffers oscilloscope waveform data representing the voltage and current waveforms, and collects data for a predetermined period related to a system fault from the oscilloscope waveform in the network. An automatic oscilloscope device for outputting in response to a request is connected, and a local area LAN and L are connected between the network and the plurality of control terminals.
An AN interface is connected to form an information transmission function using the LAN interface as a master station and each of the control terminals as slave stations, and a transmission format of master station instruction information for transmitting a reference time and a control command from the LAN interface. In the transmission area of the freezing request of the oscilloscope waveform data, the transmission format of the terminal status information for transmitting the voltage, current or state change from the control terminal, the transmission area of the accident information related to the oscilloscope waveform data. It is characterized in that each is provided.

In the cyclic buffering, time-sequential oscilloscope waveform data is sequentially written in the cycle buffer, and when the buffer is full, it is overwritten again from the beginning.

The accident information is the CB from the protection device.
It is characterized by trip or voltage fluctuation. Further, the voltage variation is combined with remaining capacity information indicating that the remaining memory capacity of the cycle buffer is equal to or more than a predetermined value, and the local area LAN and the LAN interface are configured by means of optical transmission. Is characterized by.

Further, in the method for collecting oscilloscope waveform data of the present invention, a plurality of control terminals of the electric power system are connected to a supervisory control computer and an automatic oscilloscope device via a network, and the monitoring control of the electric power system is performed together with a system fault. When collecting oscilloscope waveform data, oscilloscope waveform data including voltage and current waveform data for each facility that is sampled at a predetermined cycle is buffered cyclically at each control terminal, and each Based on the earliest information of the accident information detected by each control terminal due to the state of the equipment protection device and the final information of the accident recovery information similarly indicating the recovery of the accident and detected by each control terminal, It is characterized in that the freezing period of the oscilloscope waveform data necessary for the analysis of the system fault is aligned, and the buffer data of the freezing period is frozen in all control terminals.

The freezing period includes a period from the detection timing of the earliest information to the detection timing of the final information, and each predetermined period before and after the period.

From the master station via the network and the plurality of control terminals, time information is transmitted to each control terminal as a slave station at the predetermined cycle, and time matching processing is performed for all control terminals.

When the accident information is received in the master station instruction information for transmitting the time information and the control command at the predetermined cycle from the master station via the network and the plurality of control terminals to each of the slave terminals. , Including the freeze request for instructing the freeze process.

In addition, when the accident information is detected, the accident information is included in the terminal station status information that transmits the voltage and current measurement data for system monitoring from each control terminal to the master station at the predetermined cycle. Include and send.

Further, at the end of the freezing period, the frozen oscilloscope waveform data is transferred from each control terminal to the automatic oscilloscope device.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a power system supervisory control system according to an embodiment of the present invention. Substation equipment 1
Control terminals 151 to 15n are installed in 11 to 11n. The measured values and relay operation information captured by the control terminals 151 to 15n in the sampling cycle are stored in the indoor optical LAN 16
Is transmitted to the LAN I / F device 17 via. LANI
The / F device 17 edits the received status information and then transmits it to the supervisory control computer 10 via the Ethernet 18.
The supervisory control computer 10 monitors the status of the substation facilities 111 to 11n, and sends necessary control commands to the LANI.
It is transmitted to each control terminal via the / F device 17. The local area LAN 16 and the LAN I / F device 17 are not limited to the optical transmission system.

In this embodiment, the oscilloscope waveform data is frozen and collected while utilizing the information transmission function of the supervisory control computer 10 and the control terminals 151 to 15n. Therefore, the LAN I / F device 17 is used as a master station and each control terminal 151.
-15n is configured as a slave station. LAN I / F device 1
7 transmits the reference time information to each of the control terminals 151 to 15n to make the times of the control terminals coincide. This time information is broadcast as a master station instruction information together with a control instruction from the supervisory control computer 10 every cycle through the indoor optical LAN 16 including the star coupler 161. The measurement values and relay operation information sent from each control terminal to the LAN I / F device 17 are called terminal station status information.

Next, the function of collecting oscilloscope waveform data will be described. First, analogs of the voltage and current waveforms taken from the PTs (transformers for measuring instruments) 121 to 12n and CT (current transformers for measuring instruments) 131 to 13n installed in the substation facilities 111 to 11n in the sampling cycle as described above. The data is A / D converted by the control terminals 151 to 15n and buffered in the cycle buffers 1510 to 15n0 in the terminals. Further, the operation information of the protection devices 141 to 14n of each substation facility is also buffered in combination with the waveform data. When a system accident occurs, protective devices 141 to 14n
Among them, one or more of the protection devices related to the equipment in which the accident occurred operates. The control terminal judges this operation information and, in the case of an accident, adds the accident information to a predetermined bit of the terminal station status information, and transmits the LAN I / F 1 via the indoor optical LAN 16.
Transmit to 7.

When the optical I / F device 172 detects an accident information in the terminal status information of a control terminal, the optical I / F device 172 requests all control terminals 151 to 15n to freeze the oscilloscope waveform data buffered by each. . This freeze request
It is included in the frame of the master station instruction information including the above reference time information, and is transmitted as the activation information of the oscilloscope waveform data collection processing. This activation information is repeatedly transmitted during the accident and for a certain period after the accident (off-delay time).

The control terminals 151 to 15n normally sample the voltage and current waveform data at a constant cycle and accumulate them in time series in the cycle buffers 1510 to 15n0 together with the sampling time. When the buffers are full, the old data is overwritten. Overwriting new data. When a request for freezing oscilloscope waveform data is received from the LAN I / F 17 at the time of an accident, a certain period of time before the accident occurs (for example, 400 m
Freezing processing is performed to prohibit rewriting of the buffer for the oscilloscope waveform data in the period (freezing period) from s) to the off delay time after the accident. Then, after the completion of freezing after this period has passed, L from all control terminals 151 to 15n.
The oscilloscope waveform data of the freezing period is transmitted to the ANI / F 17. After that, the frozen buffer area is released and the oscilloscope waveform data buffering is continued.

The LAN I / F 17 edits the waveform data from all the control terminals 151 to 15n corresponding to the freeze request,
It is transmitted to the oscilloscope waveform recording device 19 connected to the Ethernet 18. The oscilloscope waveform recording device 19 accumulates the received waveform data and prints it out in response to an output request from an operator, which contributes to analysis of the cause of the accident.

FIG. 2 shows the flow of data in the system in this embodiment. The control terminals 151 to 15n collect sampling data every cycle (for example, several milliseconds) and transmit the sampling data to the monitoring control computer 10 via the LAN I / F 17. At this time, oscilloscope waveform data such as PT and CT are accumulated in time series in the buffers 1510 to 15n0 inside the terminal. In addition, the status change data in which the protection device under control operates is transmitted to the LAN I / F 17. For example, when the control terminal 151 receives the state change data, if the state change is accident information related to the oscilloscope waveform data (CB trip, voltage fluctuation, etc.), the accident information 2a is transmitted to the LA during the state change.
It is repeatedly transmitted to the NI / F 17.

FIG. 3 shows a transmission format of the terminal station status information transmitted from the control terminal. The terminal station status information is transmitted from each of the control terminals 151 to 15n, which is a slave station, to the optical I / F device 172, which is a master station, and the measured value 31 and the status data 32 are transmitted in accordance with the normal transmission format of the slave station information. , Oscilloscope data 33 and the like.

Furthermore, the terminal station status information of this embodiment includes CB trip 34, voltage fluctuation 35, and 50% of remaining memory.
It contains accident information consisting of less than 36 bits each. C
B trip unconditionally indicates the occurrence of a system accident, and it is necessary to collect oscilloscope waveform data. On the other hand, the occurrence of voltage fluctuation (above a predetermined rate of change) is not always a system fault, and it has never been useful for collecting oscilloscope waveform data. However, when an accident has already occurred and, for example, the memory area of more than 50% of the buffer 1510 is frozen, it is better to avoid the frozen processing to secure the buffering area for the subsequent data. Therefore, the voltage variation is paired with the remaining memory information and used as accident information.

The optical I / F device 172 includes control terminals 151-151.
It constantly monitors the terminal status information of 15n. For example, when the CB trip bit 34 of the accident information becomes 1, the reception time is stored as the activation time and the activation information 2b including the freeze request is transmitted to all the control terminals 151 to 15n. The activation information 2b is also transmitted when the voltage fluctuation bit 35 is 1 and the memory remaining bit 36 is 0.

FIG. 4 shows the transmission format of the master station instruction information. The optical I / F device 172 includes the control terminals 151 to 15
n as the master station instruction information every cycle, the reference time 4
1 and a region such as a control command 42 from the supervisory control computer 10 are broadcast every cycle as master station instruction information.

Further, the master station instruction information of this embodiment includes the activation information including the activation bit 43, the accident No 44, and the activation command number 45. The start bit 43 is 1 and a freeze request is issued. Accident No 44 is a number for distinguishing waveform data of each accident when the accidents occur successively, and the number of times of start command 4
5 is the number of times of integration indicating the number of requests from the start of the freeze request. This startup information is accident information 2 from the control terminal.
Even after a disappears, the start bit 4 remains until the off delay time.
3 is set to 1 and the freeze request is continuously transmitted.

The control terminals 151 to 15n start freezing after buffer data including waveform data 400 ms before a fixed time (starting time) from the time when the freeze request is first received. It should be noted that the start information includes 45 start command times
Therefore, even if one of the control terminals 151 to 15n cannot receive the first freeze request due to a communication error, it is incremented according to the number of times accompanying the freeze request of each cycle. It becomes possible to receive the number of times of activation on the control terminal side, confirm how many times the freeze request is made, and trace the required number of times to freeze the oscilloscope waveform data.
As a result, the freezing start times can be matched among the control terminals 151 to 15n, and highly reliable oscilloscope waveform data can be acquired.

After the freezing period, the control terminals 151 to 15n use the oscilloscope data area 33 of the terminal station status information and add the accident number and the data number for confirming the consistency of the data to the oscilloscope data 2c during the freezing period. And then L
Send to AN / IF17. The optical I / F device 172 adds the time information of the accident occurrence to the oscilloscope data 2c sent from the control terminal and sends it to the data editing means 171.
The data editing means 171 edits the data from each of the control terminals 151 to 15n and sends it to the automatic oscilloscope device 19.

FIG. 5 shows a LAN in the case of a system fault.
The processing flow of / IF is shown. Here, substation equipment 11
It is assumed that a CB trip occurs at 1. Substation equipment 111
When the protection device 141 of 1 is operated, the control terminal 151 sets the CB trip bit 34 of the terminal status information to 1.
The optical I / F device 172 monitors the terminal status of each cycle of the indoor optical LAN, and when 1 is set in the CB trip bit 34 (s101), recognizes that a system fault has occurred, and detects the next All control terminals 151 in a cycle
The start information including the data freeze request is transmitted to 15n (s102). Thereby, each control terminal 151-1
5n is frozen. When the optical I / F device 172 continuously receives a plurality of accident information 2a, the earliest accident information is set as the activation time.

After this, the terminal status information is checked again in the next cycle, and if "accident information" = 1, the process returns to step 102 to repeat the process of resending the freeze request (s
103). On the other hand, if “accident information” = 0, counting of the preset off-delay time is started (s1
04), the data freezing request is transmitted (s105), and each cycle is repeated until the off delay time ends (s106).
When the off-delay time ends, the start information that invalidates the data freezing request is transmitted, and the transmission of the data freezing request ends (s107).

Each of the control terminals 151 to 15n which has received the activation information indicating the end of the freeze request transmits the buffer data during the freeze period. The LAN / IF 17 receives the buffer data (s108), performs necessary editing on the oscilloscope waveform data, and transmits the waveform data to the automatic oscilloscope device 19 (s109).

As a result, the automatic oscilloscope device can output the data when needed only by storing the received data, and does not need any accident detection or freezing request processing function. Becomes

FIG. 6 is a time chart showing the operation of the protection device and the freezing operation of the oscilloscope waveform data due to the occurrence of a system fault. When a system accident occurs as shown in (a),
As in (b) to (d), it is often a system accident that spans multiple substation facilities, and multiple protective relays Ry
1, Ry2 ,. . . Ryn operates to cause a situation, and each control terminal transmits accident information to the LAN / IF 17. L
The AN / IF 17 uses the reception timing t _s of the first received RYy1 as the activation time and issues a freeze request.

All control terminals 151 to 15n have a start time t _s.
After a predetermined time (400 ms in the figure), the oscilloscope waveform data is frozen. After that, when the accident is resolved and the system returns to normal, Ry1, Ry2 ,. . . Ryn returns. Each control terminal transmits the terminal status information in which the accident information bit is reset to 0. LAN / IF17
, Within the end station status information from each control terminal, a reception timing t _f of information finally returned, continued freeze request until the end of the off-delay time Td.

According to this, since all the control terminals 151 to 15n whose time is made to coincide with each other are processed so that the start time and the end time of the frozen data coincide with each other, all the control terminals are The recording time of the oscilloscope waveform data can be made uniform, the time axis of each waveform data becomes the same, and a simple and highly accurate accident waveform analysis can be performed.

As described above, according to the supervisory control apparatus for the electric power system of this embodiment, the LAN I / F for mutually transferring information between the supervisory control computer and each control terminal is the master station and each control terminal. Is used as a slave station, and an information transmission frame is used for monitoring control from the master station to the slave station and from the slave station to the master station every cycle, and CB trip is made to the terminal station status information from the slave station. Such accident information is included, and the master station instruction information from the master station to the slave station includes a request for freezing oscilloscope waveform data to start the collection process.

Therefore, the transmission information is simplified and the processing load of the LAN I / F, which is the master station, can be reduced, so that the monitoring control and the collection of oscilloscope waveform data at the time of an accident can be processed at high speed, and the system Expansion (expansion of monitoring range) becomes easy.

[0040]

According to the present invention, since the transmission information by the supervisory control function of the electric power system by the supervisory control computer and each control terminal is used to perform the collection processing of the oscilloscope waveform data at the time of the system fault, the transmission information is transmitted. Since the processing load of the LAN I / F can be simplified and the processing load of the LAN I / F can be reduced, there is an effect that monitoring control at the time of an accident and collection of oscilloscope waveform data can be processed at high speed. Alternatively, there is an effect that the system can be easily expanded by improving the processing capacity.

Further, by the frozen data synchronization processing,
The time axis of each waveform data of all control terminals is the same,
This has the effect of facilitating highly accurate accident waveform analysis.

Further, there is an effect that the structure of the automatic oscilloscope is simplified and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a power system monitoring control device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a data flow in the configuration of one embodiment.

FIG. 3 is a transmission format diagram of terminal station status information from a control terminal (slave station) to a LAN I / F (master station).

FIG. 4 is a transmission format diagram of master station instruction information including a freeze request from a LAN I / F (master station) to a control terminal (slave station).

FIG. 5 is a processing flow chart of an oscilloscope data collection method according to an embodiment of the present invention.

FIG. 6 is a time chart showing a Ry operation and a data freezing operation when a system fault occurs.

[Explanation of symbols]

10 ... Supervisory control computer, 111-11n ... Substation equipment,
121-12n ... PT (transformer for measuring instrument), 131-13
n ... CT (current transformer for measuring instrument), 141-14n ... Protective device (relay), 151-15n ... Control terminal, 1510-1
5n0 ... Cycle buffer, 16 ... Local optical LAN, 16
DESCRIPTION OF SYMBOLS 1 ... Star coupler, 17 ... LAN I / F, 171 ... Data editing means, 172 ... Optical I / F device, 18 ... Ethernet, 19 ... Oscillating waveform recording device.

Claims (11)

[Claims] 1. A method for connecting a plurality of control terminals at a power station to a monitoring control computer and an automatic oscilloscope via a network to collect oscilloscope waveform data at the time of a system fault together with monitoring and control of a power system, The oscilloscope waveform data is always taken in from each control terminal connected to the local LAN, and the LAN I / F is triggered by the operation information of the protection device that operates at the time of a system fault.
A method for collecting oscilloscope waveform data, characterized in that all control terminals simultaneously request freezing of the acquired oscilloscope waveform data. 2. A device for performing monitoring control of a power system by periodically incorporating into a monitoring control computer the voltage and current of each electric station and the state of the protection device from a plurality of control terminals via a network, The terminal has a cycle buffer that cyclically buffers oscilloscope waveform data representing the waveforms of the voltage and current, and collects data for a predetermined period related to a system fault from the oscilloscope waveform in the network and makes a request. An automatic oscilloscope device for outputting according to the connection is provided, and a premises L is provided between the network and the plurality of control terminals.
Connect the AN and LAN interface to the LAN
An information transmission function that configures an interface as a master station and each of the control terminals as slave stations is configured, and a request for freezing the oscilloscope waveform data is made in a transmission format of master station instruction information for transmitting a reference time or a control command from the LAN interface. The transmission area of the electric power system, wherein the transmission format of the terminal status information for transmitting the voltage, the current or the status change from the control terminal is provided with the transmission area of the accident information related to the oscilloscope waveform data. Monitoring and control equipment. 3. The supervisory control device of a power system according to claim 2, wherein the accident information is a CB trip or a voltage fluctuation from the protection device. 4. The power system supervisory control device according to claim 3, wherein the accident information includes remaining voltage information indicating that the voltage fluctuation and the remaining memory capacity of the cycle buffer are equal to or more than a predetermined value. 5. The power system supervisory control device according to claim 2, 3 or 4, wherein the local area LAN and the LAN interface are configured by means of optical transmission. 6. A method of connecting a plurality of control terminals of a power system to a monitoring control computer and an automatic oscilloscope via a network to collect the oscilloscope waveform data at the time of a system fault together with the monitoring control of the power system. , The voltage of each equipment sampled at a predetermined cycle,
The oscilloscope waveform data including the current waveform data is cyclically buffered at each control terminal, and in the event of a system fault, the maximum information of the accident information detected by each control terminal from the change in the protective device of each facility Based on the final information of the accident recovery information which indicates the recovery of the accident and is similarly detected by each control terminal, the freezing period of the oscilloscope waveform data necessary for the analysis of the relevant system accident is aligned, and the freezing period is set for all control terminals. Method for collecting oscilloscope waveform data, characterized in that the buffer data of the above is frozen. 7. The oscilloscope waveform data according to claim 6, wherein the freezing period includes a period from a detection timing of the earliest information to a detection timing of the final information and each predetermined period before and after the period. How to collect. 8. The time information of all control terminals according to claim 6 or 7, wherein time information is transmitted from the master station via the network and the plurality of control terminals to each control terminal as a slave station at the predetermined cycle. A method for collecting oscilloscope waveform data, characterized by performing matching processing. 9. The parent according to claim 6, 7 or 8, wherein a parent station that intervenes the network and the plurality of control terminals transmits time information and a control command to each of the child control stations at the predetermined cycle. A method for collecting oscilloscope waveform data, characterized in that, when the accident information is received, the station instruction information is transmitted including a freeze request instructing the freeze processing. 10. The voltage according to claim 9, from each control terminal to the master station,
A method for collecting oscilloscope waveform data, characterized in that when the accident information is detected, the accident status information is transmitted when the accident information is detected in the terminal station status information for transmitting current measurement data or the like at the predetermined cycle. 11. The oscilloscope waveform data according to claim 6, wherein the frozen oscilloscope waveform data is transferred from each control terminal to the automatic oscilloscope device at the end of the freezing period. How to collect.