JP2000332809A - Optical field network system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical field network system with high reliability by allowing network connects to have provision for a duplicate configuration so that no system-down is caused by a fault in the network connector. SOLUTION: The optical field network system is provided with an A/D converter circuit that applies A/D conversion to an analog signal obtained from a sensor Sn measuring an electric quantity of field equipment Gn and outputs AI data, an AI node having a network I/F section Nn that transmits the AI data to an optical field network 2, and a server or a controller Rn that receives the AI data from the optical field network. Thus, a plurality of sensors can transmit analog signals even under a noisy installation environment such as an electric station without any data error to a control building.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an electric substation, a building,
The present invention relates to an optical field network system which is a data transmission system for executing various processes of protection, control, and monitoring of field devices such as a transformer and a gas insulated switchgear distributed in a field such as a factory.

[0002]

2. Description of the Related Art A conventional optical field network system will be described with reference to the drawings. FIG. 14 is a diagram showing a connection configuration of a conventional optical field network system disclosed in, for example, JP-A-64-8830.

In FIG. 14, reference numeral 1 denotes a control building such as an electric station, 2 denotes a network, and 3 denotes a server installed in the control building to control the electric station and exchange data with other electric stations and a wide area network. Reference numeral 4 denotes data I which is connected to the server 3 and controls the data interface with the network.
/ F device, DAP1 to DAP4 are, for example, one transmission line,
A controller that is provided in the vicinity of the on-site equipment and executes protection, control, monitoring, etc., based on one bank, one bus tie, and the like. On-site equipment such as vessels, S10
Reference numerals S41 to S41 are sensors incorporated in the on-site equipment to measure various electric quantities.

Next, the operation of the above-described conventional optical field network system will be described with reference to the drawings.

[0005] Field devices G10 to G installed in electric stations and the like
42 and state information of the sensors S10 to S41, and AI
All field data such as data is stored in the controller D
It is intensively taken into AP1 to DAP4. The controllers DAP1 to DAP4 execute protection, control, monitoring, and other processes, and transmit field data to another controller or server 3 via the network 2.

The controllers DAP1 to DAP4
Outputs control signals to the field devices G10 to G42 based on the control data resulting from the execution of each process. Further, the A / D conversion timing of each of the controllers DAP1 to DAP4 is addressed by the broadcast function of the LAN.

[0007]

In the conventional optical field network system as described above, each sensor S1
0 to S41 and status signals and control signals of the field devices G10 to G42 are transmitted through dedicated control cables C
Controllers DAP1 to DAP4 by 11 to C45
Is connected to Therefore, a large number of control cables C1
1 to C45 are still concentrated on the controllers DAP1 to DAP4.
4 There is a problem that the construction cost of the cubicle for installation and the construction cost of the cable pit for control cable wiring are high.

On the other hand, due to the recent rise in land costs for construction of electric substations, the size of field devices installed in electric substations and the sensors incorporated in the field devices have been reduced in order to reduce the construction costs of electric substations. New types of sensors such as Rogowski CT and optical CT as current transformers and capacitor-divided PDs and optical PTs as voltage transformers are being applied. The output of these sensors differs from conventional sensors in that the output level is a very small value.Therefore, considering that an electric station is in an environment where many on-site devices that are noise sources are installed, an analog signal If it is transmitted to a controller etc. with a metallic cable as it is,
At present, there is a new problem that it is difficult to obtain an accurate analog signal.

Further, since various electric quantities such as transmission lines and buses installed in electric stations and the like have an AC waveform, an analog signal output from a sensor is required to be used by a controller or a server for calculation by an A / D converter. It is necessary to control the conversion timing within a predetermined error (approximately ± 20 microseconds). However, when using the broadcast communication of the token ring type LAN, when the number of connected devices is large, the synchronization is not performed. Timing errors may occur due to variations in the period in which the master device obtains the transmission right, and variations in the time from when the synchronous master device transmits a broadcast frame to when each controller receives the broadcast frame. However, there is a problem that the size becomes larger.

Furthermore, in a system for protection, control and monitoring in an electric station or the like, it is necessary to increase the independence of the controller and the server from the viewpoint of reliability so that a single failure does not cause the entire system to go down. However, in the system connected by the conventional control cable, the connection is one-to-one, so that the problem is not so significant. However, a system using a network introduced as a conventional technique does not have a communication function of failure information of each node, and does not support a redundant configuration of a network and a connection device. There was a problem that a part or the whole went down.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. Even in a noisy installation environment such as an electric substation, analog signals obtained from a plurality of sensors can be read without errors in the field. It is an object of the present invention to obtain an optical field network system that can transmit a signal to a controller or a server installed near a device or in a control building.

Another object of the present invention is to solve the above-mentioned problems. Even in a noisy installation environment such as an electric power station, the state signals of a plurality of field devices and the controller are similarly provided. Control signal from
It is an object of the present invention to obtain an optical field network system that can transmit data to a controller or a server installed near a field device or in a control building.

Another object of the present invention is to solve the above-mentioned problem. The AI node, the DIO node, the controller, and the server transmit their own failure information to the controller or the server, and the controller or the server transmits the fault information to the controller or the server. It is an object of the server to obtain an optical field network system that can prevent a system malfunction by locking an operation when receiving an error notification.

Further, the present invention has been made to solve the above-mentioned problems, and the network has a communication function for sampling synchronization control, so that A / D conversion executed by all AI nodes can be achieved. It is an object of the present invention to obtain an optical field network system that can control the timing of the optical field network within a predetermined error.

The present invention has been made in order to solve the above-mentioned problems. When the network has a communication function for time synchronization control, the AI node, the DIO node, the controller, and the server are able to perform their own operations. It is an object of the present invention to obtain an optical field network system capable of synchronizing the time of the optical field network.

Further, the present invention has been made to solve the above-mentioned problems, and a large amount of control cables can be provided near a field device without laying a large amount of control cables from a field device to a controller installed in a control building or the like. AI node to be installed, DI
It is only necessary to lay up to the O node, and by laying optical fiber between each node-controller and server,
An object of the present invention is to obtain an optical field network system capable of suppressing the cost of civil engineering work for a cable pit.

Since the connection between the AI node, the controller, and the server is made by an optical fiber, the controller and the server can be installed in a location close to the on-site equipment.
It may be a control building.

Further, the present invention has been made to solve the above-mentioned problem, and has a high reliability by making it possible to cope with a redundant network configuration so that the system does not go down due to a network failure. It is an object of the present invention to obtain an optical field network system that can be implemented.

Further, the present invention has been made in order to solve the above-mentioned problems. In order to prevent the system from going down due to the failure of the network connecting device, the connecting device is adapted to a duplex configuration, thereby improving the system. It is an object of the present invention to obtain an optical field network system that can be made more reliable.

[0020]

According to a first aspect of the present invention, there is provided an optical field network system which converts an analog signal obtained from a sensor for measuring an electric quantity of a field device into an analog signal.
An A / D conversion circuit for D-converting and outputting as AI data,
An AI node having a network I / F unit for transmitting the AI data to the optical field network; and a control device for receiving the AI data from the optical field network.

An optical field network system according to a second aspect of the present invention is a DI input control circuit for inputting status data of a field device and outputting it as DI data.
A DIO node having a network I / F unit for transmitting I data to the optical field network and receiving DO data from the optical field network; a DIO node having a DO output control circuit for outputting the DO data to the field device; A controller for receiving the DI data from the network and transmitting the DO data to the optical field network.

In the optical field network system according to a third aspect of the present invention, the AI node, the DIO node, or the control device transmits failure information of the own device to another device through the optical field network. .

According to a fourth aspect of the present invention, in the optical field network system, the control device transmits the AI data of the AI data collected through the optical field network.
A / D conversion timing
It has a communication function for D-conversion timing synchronization control.

According to a fifth aspect of the present invention, in the optical field network system, a communication function for time synchronization control is provided so that the control device can know a time of a status change of the status data collected through the optical field network. It has.

An optical field network system according to claim 6 of the present invention is such that the optical field network is duplicated.

An optical field network system according to claim 7 of the present invention is one in which the AI node, the DIO node, or the control device is duplicated.

An optical field network system according to an eighth aspect of the present invention is such that the optical field network is duplicated and the AI node, the DIO node,
Alternatively, the control device is duplicated.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 An optical field network system according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of an optical field network system according to Embodiment 1 of the present invention. In the drawings, the same reference numerals indicate the same or corresponding parts.

In FIG. 1, reference numeral 1 denotes a control building such as an electric substation,
Reference numeral 2 denotes an optical field network, 3 denotes a server (control device) installed in the control building 1 for supervising an electric station and executing exchanges with other electric stations and a wide area network;
1 to R4 are provided near field devices on the basis of one transmission line, one bank, one bus tie, etc.
A controller (control device) having the same configuration as that of the server 3 for executing each processing of monitoring, etc., S10 to S41 are incorporated in the on-site equipment, and sensors for measuring various electric quantities, A10
A to A41 are AI nodes, G10 to G42 are field devices such as circuit breakers and disconnectors distributed in the field such as electric stations, N0 to N4 are network I / F units, and C11 to C4.
5, Cn is a control cable.

FIG. 2 is a diagram showing an internal configuration of a server or a controller (control device) of the optical field network system according to the first embodiment of the present invention.

In FIG. 2, Rn is a controller, Nn
Is a network I / F unit, and 20 is a main computer. DATA is AI data, status data or control data, and SPT is a sampling timing signal.

FIG. 3 is a diagram showing the internal configuration of the network I / F section in the server or controller of the optical field network system according to Embodiment 1 of the present invention.

In FIG. 3, 10 is a CPU, 11T is a transmission buffer memory, 11R is a reception buffer memory, 12R
Is a MAC layer control circuit, 13 is a physical layer control circuit,
14 is an optical transceiver, 15 is an A / D conversion timing synchronization control circuit, and 19 is a memory control circuit.

In FIG. 3, reference numeral 101 denotes a MAC layer error detection signal which becomes active when an error is detected by a frame test or the like performed by the MAC layer control circuit 12, and 102 denotes an A / D conversion timing synchronization control circuit 15. An A / D conversion timing synchronization error detection signal that is activated when an error is detected in an A / D conversion out-of-synchronization test or the like. A memory that is activated when an error is detected in a parity check or the like performed by the memory control circuit 19. This is a control circuit error detection signal.

FIG. 4 is a diagram showing an internal configuration of the AI node of the optical field network system according to the first embodiment of the present invention.

In FIG. 4, An is an AI node, 16 is an A / D conversion circuit, and Nn is a network I / F.
Reference numeral 103 denotes an A / D conversion circuit error detection signal which becomes active when an error is detected by an A / D conversion accuracy check performed by the A / D conversion circuit 16, AI denotes AI data, and SPT denotes a sampling timing signal. .

FIG. 5 is a diagram showing an example of a frame format of the optical field network system according to the first embodiment of the present invention.

In FIG. 5, 5 is a frame, 51 is a destination address, 52 is a source address, 53 is a frame type indicating a frame type such as priority / non-priority, 54 is sampling synchronization information, 55 is field data, 56 is Is a status for storing failure information and the like of each connected device, and 57 is a frame check sequence.

Next, the operation of the optical field network system according to the first embodiment will be described with reference to the drawings.

The optical field network 2 shown in FIG.
Is used in electric stations and the like, and the sensor S
The analog signals obtained from 10 to S41 are input to AI nodes A10 to A41 installed near the device.

The AI nodes A10 to A41 synchronize the analog signal by the A / D conversion circuit 16 with the A / D conversion timing signal SPT obtained from the A / D conversion timing synchronization control circuit 15 of the network I / F unit Nn. A / D
Conversion is performed, the frame is edited into a predetermined frame 5, and transmitted to the optical field network 2. As shown in FIG. 5, the frame 5 includes a destination address 51, a source address 52, a frame type 53, synchronization information 54,
It comprises field data 55, status 56, and frame check sequence 57.

The network I /
The frame 5 transmitted to the F units N0 to N4 is converted into an electric signal by the optical transceiver 14 and the physical layer control circuit 13, and the MAC layer control circuit 12 checks the destination address, and the frame 5 is addressed to itself. In this case, the frame is stored in the reception buffer memory 11R, and if the frame is not addressed to itself, the frame is discarded.

At this time, the frame check sequence is verified, and the validity of the frame data is checked. The frame stored in the reception buffer memory 11R is transferred to the main computer 20 by the CPU 10 and the memory control circuit 19, and used for calculation.

As described above, according to the first embodiment, analog signals obtained from a plurality of sensors are transmitted from the sensors to the control building without data errors even in a noisy installation environment such as an electric station. It becomes possible. Also,
The construction cost of cubicles and cable pits can be reduced.

That is, the optical field network system according to the first embodiment is incorporated in a plurality of transformers and gas-insulated switches (on-site equipment) installed in electric stations, buildings, factories, and the like, and measures various amounts of electricity. A plurality of analog input signal processing terminal devices installed near current transformers and voltage transformers (sensors) having a function of A / D converting an analog signal obtained from the sensor and transmitting the signal to the network 2
(AI node) and by using the AI data for calculation, to execute each process of protection, monitoring, and control of the plurality of field devices, and to output control data, which is a calculation result, in the vicinity of the field device. And / or in a network connecting various processing devices (server 3) such as a protection relay device (controller) and a monitoring control device installed in a control building,
The analog signal obtained from the sensor is converted into digital data (AI data) obtained by A / D conversion and transmitted to a controller through a network.

Embodiment 2 An optical field network system according to Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 6 is a diagram showing a configuration of an optical field network system according to Embodiment 2 of the present invention.

In FIG. 6, D10 to D42 are DIO nodes.

FIG. 7 is a diagram showing the internal configuration of the DIO node of the optical field network system according to Embodiment 2 of the present invention.

In FIG. 7, Dn is a DIO node, 17
Is a DO output control circuit, 18 is a DI input control circuit, and Nn is a network I / F unit. DO is DO data, DI is DI data, TIME is a time signal, 104 is a DO output error signal that becomes active when an error is detected by a DI readback check performed by the DO output control circuit 17, and 105 is a DI input signal. This is a DI input error signal that becomes active when an error is detected by a DI duplex check performed by the control circuit 18 or the like.

Next, the operation of the optical field network system according to the second embodiment will be described with reference to the drawings.

As in the case of the first embodiment, FIG.
The optical field network 2 shown in FIG. 1 is used in an electric power plant or the like, and the status signals of the field devices G10 to G42 are transmitted to a DIO node D1 installed near the devices.
0 to D42 for processing. DIO node D1
0 to D42 add a time stamp to the state signal in synchronization with the time signal TIME obtained from the MAC layer control circuit 12 of the network I / F unit Nn, edit the state signal into a predetermined frame 5, and edit the optical field network 2 Send to

The network I /
Transmitted to the F sections N0 to N4,
The frame stored in R is transmitted to the server 3 or the controllers R1 to R by the CPU 10 and the memory control circuit 19.
4 is transferred to the main computer 20 and used for calculation.

The server 3 or the controllers R1 to R1
The control data obtained by the operation of the main computer 20 of R4 is stored in the transmission buffer memory 11T by the CPU 10 and the memory control circuit 19. The data stored in the transmission buffer memory 11T is transmitted to the MAC layer control circuit 1
2, the transmission destination address 51, the transmission source address 52, the frame type 53, the frame check sequence 57, etc. are added, and transmitted to the network 2 by the physical layer control circuit 13 and the optical transceiver 14.

As described above, according to the second embodiment, the status signal of the on-site equipment, the control signal for the on-site equipment, the control signal between controllers, and the like can be used in an installation environment with much noise such as an electric station. Can be mutually transmitted without data error. Further, it is possible to reduce the construction cost of cubicles and cable pits.

That is, the optical field network system according to the second embodiment has a function of transmitting status data of a plurality of field devices installed near a plurality of field devices installed in an electric power station or the like to the network, and a function of transmitting the status data to the network. A plurality of digital signal input / output processing terminal devices having a function of outputting received control data to field devices
(DIO node) and the above-mentioned status data and control data of another controller or server are used for calculation to execute each process of protection, monitoring and control of the above-mentioned plurality of field devices, and control data which is a calculation result Is connected to a plurality of controllers or servers installed in the vicinity of on-site equipment or / and in a control building in order to output the data, and the signals are transmitted to each other.

Embodiment 3 An optical field network system according to Embodiment 3 of the present invention will be described with reference to the drawings. The configuration of the optical field network system according to the third embodiment is the same as the configuration of the second embodiment.

At the AI node An, when the A / D conversion circuit error detection signal 103 becomes active,
When the DO output error signal 104 or the DI input error signal 105 becomes active at the IO node Dn, the A / D conversion timing synchronization error detection signal 102 or the memory control circuit error detection signal 106 is output at the network I / F unit Nn. When it becomes active,
The CPU 10 of the network I / F unit Nn is notified.

The CPU 10 that has received the notification controls the corresponding bits of the frame type 53 and the status 56 of the frame 5 and stores them in the transmission buffer memory 11T.

As described above, according to the third embodiment, the failure information of the own device is transmitted to the controller Rn or the server 3 through the network 2 having the failure information communication function, thereby providing the controller Rn. Alternatively, when receiving the error notification, the server 3 locks the calculation, thereby preventing a malfunction of the system.

That is, the optical field network system according to the third embodiment includes a plurality of AI nodes installed near a plurality of field devices installed in an electric power station or the like.
A DIO node and a controller or server installed near the field device or / and in the control building to execute each process of protection, monitoring, and control of the plurality of field devices and to output control data as a calculation result; , A controller or a server has a function of communicating fault information of an AI node, a DIO node, a controller, and a server communicating through the network.

Embodiment 4 Embodiment 4 An optical field network system according to Embodiment 4 of the present invention will be described with reference to the drawings. FIG. 8 is a diagram showing a method generally applied to a current differential protection relay device or the like as an A / D conversion timing synchronization control method. FIG.
FIG. 3 is a diagram showing a priority transmission control function provided in a general-purpose LAN.

In FIG. 8, SPM is an A / D conversion timing synchronization master, and any one controller or electric station server connected to the network, and SPS is A
This is a / D conversion timing synchronization slave, and corresponds to all AI nodes connected to the network.

In the figure, T is the A / D conversion cycle, ΔT is the A / D conversion timing synchronization error between the A / D conversion timing synchronization master and the A / D conversion timing synchronization slave, and Td1 is the A / D conversion timing. The transmission delay time between the timing synchronization slave and the A / D conversion timing synchronization master, Td2 is the A / D conversion timing synchronization master to
The transmission delay time between the A / D conversion timing synchronization slaves, Tsm is the measurement time of the A / D conversion timing synchronization slave, and the time from reception of a frame from the A / D conversion timing synchronization master to its own A / D conversion timing,
Tms is an A / D conversion timing synchronization master measurement time, and is a time from reception of a frame from an A / D conversion timing synchronization slave to its own A / D conversion timing.

In FIG. 9, SW is a switching hub having a priority transmission control function used in a general-purpose LAN.
n (1) to An (4) are AI nodes, L is a non-priority frame, H is a priority frame for A / D conversion timing synchronization control, Tds is a switching hub relay delay, Tdmi.
n is the minimum value of the transmission delay time of the priority frame H, Tdma
x is the maximum value of the transmission delay time of the priority frame H, and Tf is 1
This is the time required to transmit a frame.

Next, the operation of the optical field network system according to the fourth embodiment will be described with reference to the drawings.

In order to calculate the A / D conversion timing synchronization error ΔT according to the method shown in FIG.
Either d1 and Td2 may be known values or Td1 = Td2. However, it is difficult to accurately measure the transmission delay time.
It is necessary to design the network to be d2.

The switching hub SW having a priority transmission control function used in a general-purpose LAN relays (transmits) frames in principle on a first-come, first-served basis.
And a function of relaying the priority frame H with priority when the priority frame H and the priority frame H are received at the same time.

The time Tf required for transmitting one frame is fixed or equal to or less than a fixed value among all the connected devices.
The minimum value Tdmin of the transmission delay time is a case where there are no frames arriving at the same time and there is no queuing delay, ignoring the delay time propagating through the optical fiber, and there is only the relay delay Tds of the switching hub SW. On the other hand, the minimum value Tdmax of the transmission delay time of the priority frame H is when the frames arrive from all the connected devices at the same time.
It is a value Tds + Tf obtained by adding the time Tf required for transmitting one frame to dmin.

Therefore, the fluctuation of the transmission delay time of the priority frame H can be kept within the time Tf required for transmitting one frame, and the A / D conversion timing synchronization slave to A
The transmission delay time Td1 between the / D conversion timing synchronization master and the transmission delay time Td between the A / D conversion timing synchronization master and the A / D conversion timing synchronization slave
The difference between the two can be made equal to or less than twice the time Tf required for transmitting one frame. Here, Tf is a transmission speed of 100
When a general-purpose LAN of about Mbps is used, the shortest is 7
This is on the order of microseconds.

As described above, according to the fourth embodiment, the fluctuation of the transmission delay time of the priority frame H can be made within the time Tf required for transmitting one frame.
A transmission delay time Td1 between an A / D conversion timing synchronization slave and an A / D conversion timing synchronization master,
The difference between the transmission delay time Td2 between the conversion timing synchronization master and the A / D conversion timing synchronization slave can be made twice or less the time Tf required for transmitting one frame.

That is, by applying a method generally applied to a current differential protection relay device or the like to this network as an A / D conversion timing synchronization control method, the A / D conversion timing at all AI nodes can be adjusted. Control can be performed within a predetermined error (about ± 20 microseconds).

The priority transmission control level used in the fourth embodiment is a two-level priority transmission control level.
Some types of general-purpose LANs and types of commercially available switching hubs support three or more priority transmission control levels, and frames other than the A / D conversion timing synchronization control frame (for example, failure information) ,
Control data, etc.), it is possible to guarantee the transmission delay time.

That is, the optical field network system according to the fourth embodiment uses a plurality of AI nodes installed near a plurality of sensors installed in an electric substation or the like and an output signal of the sensor for calculation. In a network connecting a plurality of controllers or servers installed in the vicinity of the field devices or / and the control building to execute the processes of protection, monitoring, and control of the field devices, the controller or the server includes: It has a communication function for A / D conversion timing synchronization control in order to guarantee the same time of A / D conversion timing of AI data collected through a network.

Embodiment 5 An optical field network system according to Embodiment 5 of the present invention will be described with reference to the drawings. FIG. 10 is a diagram showing a time synchronization control method.

In FIG. 10, TM is a time synchronization master,
SW is a switching hub, TS is a time synchronization slave, Y
Is a time synchronization frame.

Next, the operation of the optical field network system according to the fifth embodiment will be described with reference to the drawings.

The time synchronization frame Y transmitted from the time synchronization master TM is transmitted to the all time synchronization slave TS by using general broadcast communication as a function of the general-purpose LAN.

The data section 55 of the time synchronization frame Y includes
The current time is written, and the time synchronization slave TS
When the time synchronization frame Y is received, the current time held by itself is adjusted to the time written in the received frame.

At this time, by using the priority transmission control function as shown in the fourth embodiment, it is possible to keep the variation of the transmission delay time of the time synchronization frame Y within a certain value, and It is possible to meet the requirements for accuracy.

As described above, according to the fifth embodiment, it is possible to synchronize the time of all the connected devices.
It facilitates recording, statistics, and analysis of events in substations collected from AI nodes, DIO nodes, and controllers through a network.

That is, the optical field network system according to the fifth embodiment includes a plurality of DIO nodes installed near a plurality of field devices installed in an electric substation or the like.
By using the status data of the on-site equipment for the calculation, a plurality of controllers installed near the on-site equipment or / and in a control building to execute each processing of protection, monitoring and control of the on-site equipment Is provided with a communication function for time synchronization control so that the controller or the server can know the time of status change of status data collected through the network.

Embodiment 6 FIG. An optical field network system according to Embodiment 6 of the present invention will be described with reference to the drawings. FIG. 11 is a diagram illustrating a duplex configuration of a network.

In FIG. 11, 2-1 is a service network, 2-2 is a standby network, Nn-1 is a network I / F of the service network, and Nn-2 is a network I / F of the standby network. It is.

Next, the operation of the optical field network system according to the sixth embodiment will be described with reference to the drawings.

The analog signal obtained from the sensor is AI
The signal is input to the node An, and the A / D conversion circuit 16
Is converted. The AI data after the A / D conversion are stored in a network I / F unit Nn-1 of the service network and a network I / F unit Nn-2 of the standby network, respectively.
Is transmitted to the connected optical field network, and transmitted to the network I / F unit Nn-1 of the service network of the controller Rn and the network I / F unit Nn-2 of the standby network, respectively. Then, the data is transferred to the main computer 20 of the controller Rn, and the main computer 20 determines which data in the two-system network is to be used and executes the operation. The status data, fault information, A / D conversion timing synchronization control information, and time synchronization control information
Same as I data.

Conversely, for the control data, which is the operation result of the main computer 20, the main computer 20 determines which one of the two networks is to be used for data transmission, and either one or both networks are used. It outputs control data to the I / F unit.

As described above, according to the sixth embodiment, it is possible to increase the reliability of the system by duplicating the network so that the system does not go down due to a network failure.

That is, the optical field network system according to the sixth embodiment includes a plurality of AI nodes and DIs installed near a plurality of field devices installed in an electric substation or the like.
By using the O node and the status data of the on-site equipment for calculation, it is installed near the on-site equipment or / and in a control building to execute each process of protection, monitoring, and control of the plurality of on-site equipment. In a network connecting a plurality of controllers, the reliability of the system is improved by duplicating the network.

Embodiment 7 An optical field network system according to Embodiment 7 of the present invention will be described with reference to the drawings. FIG. 12 is a diagram illustrating a duplex configuration of the network connection device.

In FIG. 12, Rn-A is a regular controller, Rn-B is a standby controller, and An-A
Is a service AI node, An-B is a standby AI node, Dn-A is a service DIO node, and Dn-B is a standby DIO node.

Next, the operation of the optical field network system according to the seventh embodiment will be described with reference to the drawings.

The analog signal obtained from the sensor is transmitted to the AI node An-A of the normal system and the AI node An-A of the standby system.
B, and are A / D converted by the A / D conversion circuit 16. The AI data after the A / D conversion is transferred to the network I / F unit Nn and transmitted to the network 2. The status data, fault information, A / D conversion timing synchronization control information, and time synchronization control information of the field devices are the same as the AI data.

The controller Rn-A of the ordinary system transfers the data obtained from the network to the main computer 20 and transmits control data, which is the operation result of the main computer 20, to the network 2. On the other hand, the standby controller Rn-
B transmits the data obtained from the network 2 to the main computer 2
0, but does not transmit the control data, which is the operation result of the main computer 20, to the network.

The system switching between the normal and standby modes of the controller is executed by exchanging control data between the controllers. For example, the controller Rn-A of the service system is assumed to continuously transmit the control data to the controller Rn-B of the standby system at a fixed period, and the controller Rn-A of the standby system is set.
The n-B may be a system in which the n-B itself becomes a regular system when it does not receive control data of a fixed period.

As described above, according to the seventh embodiment, the reliability of the system can be improved by duplicating the network connection device so that the system does not go down due to the failure of the network connection device. Become.

That is, the optical field network system according to the seventh embodiment includes a plurality of AI nodes and DIs installed in the vicinity of a plurality of field devices installed in an electric station or the like.
By using the O node and the status data of the on-site equipment for calculation, it is installed near the on-site equipment or / and in a control building to execute each process of protection, monitoring, and control of the plurality of on-site equipment. In a network connecting a plurality of controllers, the reliability of the system is improved by duplicating connection devices.

Embodiment 8 FIG. An optical field network system according to Embodiment 8 of the present invention will be described with reference to the drawings. FIG. 13 is a diagram showing a duplex configuration of a network and a network connection device.

The analog signal obtained from the sensor is supplied to the AI node An-A of the normal system and the AI node An-A of the standby system.
B, and are A / D converted by the A / D conversion circuit 16. The AI data after the A / D conversion is transferred to the network I / F unit Nn-1 of the service network and the network I / F unit Nn-2 of the standby network, respectively, and the optical field network 2 connected to each of them. -1, 2-2, and the network I / F unit Nn-1 of the service network of the service controller Rn-A, the network I / F unit Nn-2 of the service network, and the service controller Rn-, respectively. B is transmitted to the network I / F Nn-1 of the service network and the network I / F Nn-2 of the standby network. The status data, fault information, A / D conversion synchronization control information, and time synchronization control information of the field devices are the same as the AI data.

The controller Rn-A of the ordinary system transfers the data obtained from the network to the main computer 20 and transmits the control data, which is the operation result of the main computer 20, to one or both of the data determined by the main computer. To the system network. On the other hand, the standby controller Rn
-B uses the data obtained from the network as the main computer 2
0, but does not transmit the control data, which is the operation result of the main computer 20, to the network.

As in the case of the seventh embodiment, the system switching of the controller Rn between normal and standby is performed by exchanging control data between the controllers.

As described above, according to the eighth embodiment, the network and the network connection device are duplicated so that the system does not go down due to the failure of the network or the network connection device, thereby improving the reliability of the system. It is possible to do.

That is, the optical field network system according to the eighth embodiment includes a plurality of AI nodes and DIs installed in the vicinity of a plurality of field devices installed in an electric substation or the like.
By using the O node and the status data of the on-site equipment for calculation, it is installed near the on-site equipment or / and in a control building to execute each process of protection, monitoring, and control of the plurality of on-site equipment. In a network connecting a plurality of controllers, the reliability of the system is improved by duplicating the network and the connecting device.

[0103]

As described above, the optical field network system according to the first aspect of the present invention performs A / D conversion of an analog signal obtained from a sensor for measuring the quantity of electricity of a field device and outputs it as AI data. An A / D conversion circuit, an AI node having a network I / F unit for transmitting the AI data to the optical field network, and a control device for receiving the AI data from the optical field network. An analog signal obtained from a sensor can be transmitted from a sensor to a control building without data errors even in an installation environment with much noise such as an electric station, and the construction cost of cubicles and cable pits can be reduced.

As described above, in the optical field network system according to the second aspect of the present invention, the DI for inputting the status data of the field device and outputting it as DI data.
A DIO node having an input control circuit, a network I / F unit for transmitting the DI data to the optical field network and receiving the DO data from the optical field network, and a DO output control circuit for outputting the DO data to the field device Receiving the DI data from the optical field network and the DO
And a control device for transmitting data to the optical field network, so that a status signal of a field device or a control signal for the field device or a control signal between controllers can be used in a noisy installation environment such as an electric station. This also has the effect that data can be transmitted to each other without data errors and the construction cost of cubicles and cable pits can be reduced.

The optical field network system according to claim 3 of the present invention, as described above,
Since the node, the DIO node, or the control device transmits failure information of the own device to another device through the optical field network, by transmitting the failure information of the own device to, for example, a controller or a server,
When receiving the error notification, the controller or the server locks the operation, thereby preventing a malfunction of the system.

In the optical field network system according to a fourth aspect of the present invention, as described above, the control device guarantees the same time of A / D conversion timing of the AI data collected through the optical field network. As described above, since the communication function for the A / D conversion timing synchronization control is provided, the fluctuation of the transmission delay time of the priority frame H can be made within the time required for transmission of one frame. As a control method, by applying a method generally applied to a current differential protection relay device to the present network, it is possible to control A / D conversion timing in all AI nodes within a predetermined error. It works.

As described above, in the optical field network system according to the fifth aspect of the present invention, the control device performs time synchronization control so as to know the time of the status change of the status data collected through the optical field network. Has a communication function for
It is possible to synchronize the time of all the connection devices such as the nodes, and it is possible to easily record, statistic, and analyze events in the electric substation.

As described above, in the optical field network system according to claim 6 of the present invention, since the optical field network is duplicated, the system does not go down due to a network failure, and the system has high reliability. This has the effect that it can be performed.

The optical field network system according to claim 7 of the present invention, as described above,
Since the node, the DIO node, or the control device is duplicated, there is an effect that the system does not go down due to the failure of the network connection device and the reliability of the system can be increased.

As described above, the optical field network system according to claim 8 of the present invention duplicates the optical field network and duplicates the AI node, the DIO node, or the control device. In addition, there is an effect that the system does not go down due to the failure of the network connection device and the system can be highly reliable.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an optical field network system according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing an internal configuration of a server or a controller of the optical field network system according to each embodiment of the present invention.

FIG. 3 is a diagram showing an internal configuration of a network I / F unit of the optical field network system according to each embodiment of the present invention.

FIG. 4 is a diagram showing an internal configuration of an AI node of the optical field network system according to each embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a frame of the optical field network system according to each embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of an optical field network system according to Embodiment 2 of the present invention.

FIG. 7 is a diagram showing an internal configuration of a DIO node of the optical field network system according to each embodiment of the present invention.

FIG. 8 is a diagram showing an A / D conversion timing synchronization control method for an optical field network system according to Embodiment 4 of the present invention.

FIG. 9 is a diagram showing a priority transmission control method for a general-purpose LAN in an optical field network system according to Embodiment 4 of the present invention.

FIG. 10 is a diagram showing a time synchronization control method of an optical field network system according to Embodiment 5 of the present invention.

FIG. 11 is a diagram showing a network configuration of an optical field network system according to Embodiment 6 of the present invention.

FIG. 12 is a diagram showing a network configuration of an optical field network system according to Embodiment 7 of the present invention.

FIG. 13 is a diagram showing a network configuration of an optical field network system according to Embodiment 8 of the present invention.

FIG. 14 is a diagram showing a network configuration of a conventional optical field network system.

[Explanation of symbols]

1 control building, 2 networks, 2-1 regular network, 2-2 standby network, 3 servers,
10 CPU, 11T transmission buffer memory, 11R
Receive buffer memory, 12 MAC layer control circuit, 1
3 Physical layer control circuit, 14 Optical transceiver, 15
A / D conversion timing synchronization control circuit, 16 A / D conversion circuit, 17 DO output control circuit, 18 DI input control circuit, 19 memory control circuit, 20 main computer, Gn
On-site equipment, Sn sensor, Cn control cable, Rn controller, Rn-A service controller, Rn-B
Standby controller, Nn network I / F, N
n-1 working network I / F, Nn-2 standby network I / F, An AI node, An-A
Service AI node, An-B Standby AI node, D
n DIO node, Dn-A regular DIO node, D
n-B Standby DIO node, SPMA / D conversion timing synchronization master, SPS A / D conversion timing synchronization slave, TM time synchronization master, TS time synchronization slave, SW switching hub.

Claims (8)

[Claims] 1. An A / D conversion circuit for A / D converting an analog signal obtained from a sensor for measuring an electric quantity of a field device and outputting it as AI data, and a network for transmitting the AI data to an optical field network An optical field network system, comprising: an AI node having an I / F unit; and a control device that receives the AI data from the optical field network. 2. A DI input control circuit for inputting status data of a field device and outputting the same as DI data, a network I / F unit for transmitting the DI data to an optical field network and receiving DO data from the optical field network. And a DIO node having a DO output control circuit for outputting the DO data to the field device; and a control device for receiving the DI data from the optical field network and transmitting the DO data to the optical field network. An optical field network system, characterized in that: 3. The optical field network according to claim 1, wherein the AI node, the DIO node, or the control device transmits failure information of the own device to another device through the optical field network. system. 4. The control device has a communication function for A / D conversion timing synchronization control so as to guarantee the same time of A / D conversion timing of the AI data collected through the optical field network. The optical field network system according to claim 1, wherein: 5. The control device according to claim 2, wherein the control device has a communication function for time synchronization control in order to know a time of a status change of the status data collected through the optical field network. Optical field network system. 6. The optical field network system according to claim 1, wherein said optical field network is duplicated. 7. The system according to claim 1, wherein the AI node, the DIO node, or the control device is duplicated.
An optical field network system according to any one of claims 1 to 5. 8. The optical field according to claim 1, wherein said optical field network is duplicated, and said AI node, said DIO node, or said control device is duplicated. Network system.