CN110729707B - Interval protection control system of intelligent substation - Google Patents
Interval protection control system of intelligent substation Download PDFInfo
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- CN110729707B CN110729707B CN201910909917.6A CN201910909917A CN110729707B CN 110729707 B CN110729707 B CN 110729707B CN 201910909917 A CN201910909917 A CN 201910909917A CN 110729707 B CN110729707 B CN 110729707B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
- H02H1/0069—Details of emergency protective circuit arrangements concerning transmission of signals by means of light or heat rays
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Emergency Protection Circuit Devices (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses an intelligent substation interval protection control system, which aims to solve the technical problems of improving the quick action and the reliability of intelligent substation protection and improving the operation and maintenance efficiency. The invention adopts the following technical scheme: an intelligent substation interval protection control system is provided with a management module, an application module, an input/output module and an analog-to-digital conversion module. Compared with the prior art, the intelligent substation interval protection control system is arranged in one interval, so that the alternating voltage and the alternating current, the circuit breaker and the isolation switch on-off position information, analog-to-digital conversion, control and protection are acquired at the interval, the action speed of protection is improved, the operation reliability of the intelligent substation is improved, and the operation and maintenance efficiency of the intelligent substation is greatly improved.
Description
Technical Field
The invention relates to an intelligent substation control system, in particular to an interval control system of an intelligent substation.
Background
In the prior art, an intelligent substation (transformer substation) adopts a point-to-point optical fiber direct-acquisition and direct-jump mode, and a protection system consisting of an intelligent protection and merging unit and an intelligent terminal is used for completing the function of traditional microcomputer relay protection, so that the digitization of secondary information of the whole substation is realized. Under the technical conditions at the present stage, the intelligent substation protection system of the intelligent protection and merging unit and the intelligent terminal has the following defects: (1) in the aspect of operation and maintenance, the network structure of the intelligent substation is complex, configuration files are numerous, the intelligent protection improves interoperability of protection, but the network structure is changed into a three-layer two-network (station control layer, spacer layer, process layer, station control layer network and process layer network), numerous process layer configurations are required, the difficulty of operation and maintenance is improved, and the efficiency of operation and maintenance is reduced. (2) In the aspect of management, the scale of a power grid is not adapted to the number of personnel, the scale of the power grid is continuously enlarged, 1.5 thousands of substations with the storage of 110 kilovolts or more are currently built in a state grid, nearly 1000 substations are newly built in each year, operation and maintenance personnel basically do not increase, the intelligent protection level is greatly improved, and the operation and maintenance personnel still stay at the traditional protection technical level, so that the management is difficult. (3) In the technical aspect, the protection speed and reliability are reduced, the intelligent protection system has multiple transmission links, the single-interval protection speed is 6-8 ms longer than that of the conventional protection of the whole group, the failure rate of public equipment such as a merging unit is high, multiple sets of protection incorrect actions are often caused by single equipment failure, and the protection reliability is reduced compared with the conventional protection.
Disclosure of Invention
The invention aims to provide an intelligent substation interval protection control system, and aims to solve the technical problems of improving the quick action and the reliability of intelligent substation protection and improving the operation and maintenance efficiency.
The invention adopts the following technical scheme: an intelligent substation interval protection control system is provided with a management module, an application module, an input/output module and an analog-to-digital conversion module;
the analog-to-digital conversion module acquires an alternate alternating voltage and alternating current, converts the alternate alternating voltage and alternating current into digital signals, and sends the digital signals to the application module and the management module according to a frame format message defined in the table 1;
TABLE 1 frame Format
| (symbol) | The meaning of |
| 68H | Start character |
| Length_L | APDU Length (Low byte) |
| Length_H | APDU Length (high byte) |
| Addr_S | Source address |
| Addr_D | Target address |
| Code_L | Feature code (Low byte) |
| Code_H | Feature code (high byte) |
| Msg1 | Information content |
| Msg2 | |
| …… | |
| Msgm |
m is the number of messages;
the input and output module acquires the on-off position information of the circuit breaker and the isolation switch at intervals, converts the information into digital signals, and sends the digital signals to the application module and the management module according to frame format messages defined in the table 1; the input and output module receives the messages of the application module in the frame format defined in the table 1, analyzes the messages, obtains tripping and closing commands of the breaker and the isolation switch, and sends the tripping and closing commands to primary equipment;
the application module receives the frame format message defined according to the table 1, analyzes the message, and acquires alternating voltage and alternating current at intervals, and opening and closing position information of a circuit breaker and an isolation switch; comparing the alternating voltage and the alternating current with a preset threshold value of the protection control logic, comparing the opening and closing position information of the circuit breaker and the isolation disconnecting link with a preset state of the protection control logic, and sending tripping and closing commands to the input and output module according to a frame format message defined in table 1 when action conditions are met;
the management module receives the frame format messages defined according to the table 1, analyzes the messages, obtains alternate alternating voltage and alternating current, breaker and isolation disconnecting link switching and closing position information, codes the messages according to a Message Manufacturing Specification (MMS) format defined in the 6 th chapter of IEC61850-8-1-2004, and sends the messages to the intelligent substation monitoring system.
The application module encodes the alternating-current voltage and alternating-current obtained by analysis according to a sampling value message (SV) format of IEC61850-9-2-2004 to form a message, encodes the circuit breaker and isolation disconnecting link opening and closing position information obtained by analysis according to a General Object Oriented Substation Event (GOOSE) format of IEC61850-8-1-2004 appendix C to form a message, and sends the message to a system of a main transformer differential protection device, a bus protection device and a station area protection device.
The analog-to-digital conversion module of the invention obtains alternating voltage and alternating current from the current transformer and the voltage transformer which are arranged at intervals.
The intelligent substation interval protection control system is respectively arranged on the intelligent substation interval protection control devices of all the intervals of the intelligent substation.
The intelligent substation interval protection control device is provided with a management board, an application board, an input/output board and an analog-digital conversion board, and the management board, the application board, the input/output board and the analog-digital conversion board are connected by adopting a management bus and a data bus.
The application module is arranged on the application board, the input and output module is arranged on the input and output board, the analog-to-digital conversion module is arranged on the analog-to-digital conversion board, and the management module is arranged on the management board.
The management board of the invention establishes communication connection with the intelligent substation monitoring system through the external optical fiber 1.
The application board of the invention establishes communication connection with the network switch of the intelligent substation through the external optical fiber 2.
Compared with the prior art, the intelligent substation interval protection control system is arranged in one interval, so that the alternating voltage and the alternating current, the circuit breaker and the isolation switch on-off position information, analog-to-digital conversion, control and protection are acquired at the interval, the action speed of protection is improved, the operation reliability of the intelligent substation is improved, and the operation and maintenance efficiency of the intelligent substation is greatly improved.
Drawings
FIG. 1 is a schematic diagram of the system operation of the present invention.
FIG. 2 is a schematic diagram of the apparatus of the present invention.
Fig. 3 is a schematic structural diagram of the intelligent substation interval protection control system of the invention.
Fig. 4 is a schematic system flow diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. As shown in fig. 3, the intelligent substation interval protection control system (system, interval protection control system, interval intelligent protection control system) of the present invention is provided with a management module, an application module, an input/output IO module, and an analog-to-digital conversion AD module. The management module, the application module, the IO module and the AD module are all connected with other modules by adopting a data bus and a management bus.
The AD module acquires alternating current quantity information from a current transformer and a voltage transformer which are arranged in an interval (interval N) to be controlled of the intelligent substation, the alternating current quantity information is alternating voltage and alternating current of the interval N, the alternating current quantity information is recombined into an internal message of the alternating current quantity information, and the internal message is sent to the application module and the management module through a data bus according to a frame format message defined in a table 1.
TABLE 1 frame Format
m is the number of messages.
Recombining the traffic information into an internal message of the traffic information: the AC analog signals are converted into digital signals through an AD module, then the AC digital signals are written into message bodies represented by Msg 1-Msgn according to a frame format defined by the table 1, and the digital signals are sent to an application module and a management module through a data bus.
The IO module acquires switching value information from an operation box installed in an interval N operation circuit breaker and an isolation switch of the intelligent substation through a cable, the switching value information comprises circuit breaker on-off position information and isolation switch on-off position information, the switching value information is recombined into an internal message of the switching value information, and the internal message is sent to the application module and the management module through a data bus according to a frame format message defined in the table 1.
Recombining the switching value information into an internal message of the switching value information: and converting the opening and closing position information of the circuit breaker and the opening and closing position of the isolation disconnecting link into digital signals through AD, writing the switching value position signals into message bodies represented by Msg 1-Msgn according to a frame format defined by the table 1, and sending the message bodies to the application module and the management module through a data bus.
The IO module receives an internal message of the application module, analyzes the message layer by layer according to a frame format defined in table 1, acquires message body contents represented by Msg 1-Msgn, wherein the message body contents are tripping and closing commands of a breaker and an isolation switch, and the IO module sends the tripping and closing commands acquired by analysis to primary equipment through a cable to complete tripping and closing operations of the primary equipment.
The application module receives an internal message of the traffic information and an internal message of the switching value information through the data bus, analyzes the messages layer by layer according to a frame format defined in table 1, acquires message body contents represented by Msg 1-Msgn, the message body contents are alternating current information and switching value information at an interval of N, compares the alternating current information with a preset threshold value of protection control logic according to the prior art, compares the switching value information with the preset state of the protection control logic, and converts a tripping command and a closing command into the internal messages to send to the IO module when an action condition is reached.
And converting into an internal message: the application module writes tripping and closing commands into message bodies represented by Msg 1-Msgn according to a frame format defined in the table 1, and sends the tripping and closing commands to the IO module through a data bus to complete interval line differential protection, line backup protection and main transformer backup protection.
Meanwhile, the application module encodes the alternating current quantity information obtained through analysis according to the SV format of the sampling value message of IEC61850-9-2-2004 to form a message, encodes the switching quantity information obtained through analysis according to the GOOSE format of the transformer substation event facing the universal object in IEC61850-8-1-2004 appendix C to form a message, and sends the message to other protection device systems through a network switch. Other protection devices are: the device comprises a main transformer differential protection device, a bus protection device and a station area protection device.
The management module receives the internal Message of the alternating current quantity information and the internal Message of the switching value information through a data bus, analyzes the messages layer by layer according to a frame format defined in table 1, acquires Message body contents represented by Msg 1-Msgn, encodes the Message body contents into alternating current quantity information and switching value information at an interval N according to a Message manufacturing specification MMS (managing Message specification) format defined in Chapter 6 of IEC61850-8-1-2004, and sends the Message (MMS Message) to a substation monitoring system for use by using a network switch.
The management module also completes other tasks such as recording, debugging tools, and message monitoring.
As shown in fig. 2, the system of the present invention is provided in each bay of the intelligent substation, and is provided in each bay of the intelligent substation. The device is provided with a management board, an application board, an IO board, an AD board and a power supply board. The management bus is connected with the management board, the application board, the IO board and the AD board through the data bus, the management bus is used for transmitting wave recording, debugging tools and message monitoring information, and the data bus is used for transmitting analog quantity information, switching quantity information and tripping and closing information. The management board establishes communication connection with the substation monitoring system through the external optical fiber 1, and the application board establishes communication connection with the substation network switch through the external optical fiber 2. The power panel supplies power to the management panel, the application panel, the IO panel and the AD panel through the power bus, the power panel can convert direct current 220V and alternating current 220V into a 24V direct current power supply, and the management panel, the application panel, the IO panel and the AD panel are supplied power through the power bus.
The application module is arranged on the application board. And the optical port of the application board establishes communication connection with a network switch of the transformer substation through the external optical fiber 2. The application module converts the alternating current quantity information and the switching value information into SV and GOOSE messages, and the SV and GOOSE messages are transmitted to the network switch through the optical port of the application board and the external optical fiber 2.
The IO module is arranged on the IO board. The IO board collects the interval switching value information through a cable and sends the switching value information to the application board and the management board through a data bus.
The AD module is arranged on the AD board. The AD board collects the analog alternating voltage and alternating current of the interval current transformer and the voltage transformer through a cable, and sends the analog alternating voltage and the alternating current to the application board and the management board through a data bus.
The management module is arranged on the management board.
As shown in fig. 1, the system of the present invention is respectively installed in each bay of a substation, and the bay protection control systems 1 to n and other protection systems are connected to a substation monitoring system through optical fibers and a network switch. And n is the number of transformer substation intervals. The interval protection control system collects alternating current quantity information of the interval current transformer and the voltage transformer and switching value information of the operation box through cables.
The interval protection control system is directly connected with the interval voltage transformer, the current transformer and the operation box through cables to obtain alternating current quantity information and switching value information, and switching values needing to be tripped and closed are sent to the operation box through the cables through analysis and protection control logic operation to complete the protection of the interval.
The interval protection control system completes MMS communication with the transformer substation monitoring system by means of the network switch, sends the alternating current quantity information and the switching quantity information of the interval to the transformer substation monitoring system, receives the control command sent by the transformer substation monitoring system, converts the control command into corresponding switching-on and switching-off switching quantities, and sends the switching quantities to the operation box through the cable to complete the control of the transformer substation monitoring system on the interval. The interval protection control system encodes the collected alternating current quantity information and switching value information, converts the alternating current quantity information and the switching value information into SV and GOOSE messages, and sends the SV and GOOSE messages to other protection needing the information through a network switch to finish interval information digital conversion.
The system of the invention has the following advantages:
1. all protection control functions of the interval can be completed by configuring one device at each interval, so that the configuration quantity of secondary equipment of the transformer substation is greatly reduced, and the economical efficiency of transformer substation construction is effectively improved.
2. The interval protection control system is responsible for providing alternating current quantity information and switching value information of each interval, other protections are not needed for repeatedly acquiring information, the structure of the transformer substation protection system is simplified, and the operation and maintenance efficiency of the protection system is improved.
3. The interval protection control system adopts the cable to directly acquire alternating current quantity information and switching value information, and compared with the intelligent substation protection system in the prior art which acquires through a merging unit and an intelligent terminal, the interval protection control system reduces the middle conversion link, improves the action speed of protection, and improves the reliability of a power system.
As shown in fig. 4, the main loop flow of each module of the system is different depending on whether or not the system is operated. In order to facilitate debugging and management of users, the management board is provided with an operating system, and the main cycle process of the management board is as follows: and turning off the interrupt, initializing the system, turning on the interrupt, and starting the thread task. Each thread task runs independently. The system initialization comprises the following steps: hardware initialization, platform information initialization, protection component initialization, and the like. The main thread tasks supported by the management board program include: the system comprises an MMS service task, a protection component main cycle task, a wave recording component main cycle task, a remote display task, a debugging tool task, a management bus communication task, a monitoring system communication task, a message monitoring task, a TCP link monitoring task, a watchdog monitoring task and the like. The application board is not provided with an operating system, and the main circulation flow comprises the following steps: the system comprises an interruption closing module, a system initialization module, an interruption opening module, a protection component main circulation module and a communication module in a management bus. The protection component main cycle module and the management bus internal communication module execute in turn in the dead cycle. The communication processing of the management bus of each plate is in the main cycle, and the sending command of the message data of the management bus is issued in the interrupt service.
The intelligent substation can simultaneously realize the functions of acquisition, analog-to-digital conversion, protection, control and protection of each interval in the substation, and can configure line differential protection, line backup protection and main transformer backup protection according to the specific requirements of the intelligent substation; the control function can configure interval measurement information acquisition, scheduling remote control according to the specific requirements of the intelligent substation; the analog-to-digital conversion can be used for converting the interval alternating current quantity information and the switching value information from analog quantity to digital quantity according to the specific requirements of the transformer substation, so that the conversion can be used for other protection in the intelligent transformer substation. Compared with the configuration of the intelligent transformer substation in the prior art, the intelligent transformer substation interval protection control system can realize backup protection and control of the interval, and the number of intelligent transformer substation protection control devices is greatly reduced; the intelligent substation interval protection control system completes the acquisition of analog quantity and switching value by means of the short cable, does not depend on the intermediate transmission and conversion link of the intelligent substation, greatly improves the action speed of protection, and improves the operation reliability of the intelligent substation.
Claims (6)
1. The utility model provides an intelligent substation interval protection control system which characterized in that: the intelligent substation interval protection control system is provided with a management module, an application module, an input/output module and an analog-to-digital conversion module;
the analog-to-digital conversion module acquires an alternate alternating voltage and alternating current, converts the alternate alternating voltage and alternating current into digital signals, and sends the digital signals to the application module and the management module according to a frame format message defined in the table 1;
TABLE 1 frame Format
m is the number of messages;
the input and output module acquires the on-off position information of the circuit breaker and the isolation switch at intervals, converts the information into digital signals, and sends the digital signals to the application module and the management module according to frame format messages defined in the table 1; the input and output module receives the messages of the application module in the frame format defined in the table 1, analyzes the messages, obtains tripping and closing commands of the breaker and the isolation switch, and sends the tripping and closing commands to primary equipment;
the application module receives the frame format message defined according to the table 1, analyzes the message, and acquires alternating voltage and alternating current at intervals, and opening and closing position information of a circuit breaker and an isolation switch; comparing the alternating voltage and the alternating current with a preset threshold value of the protection control logic, comparing the opening and closing position information of the circuit breaker and the isolation disconnecting link with a preset state of the protection control logic, and sending tripping and closing commands to the input and output module according to a frame format message defined in table 1 when action conditions are met;
the management module receives the frame format message defined according to the table 1, analyzes the message, obtains alternate alternating voltage and alternating current, breaker and isolation switch on-off position information, codes the formed message according to a Message Manufacturing Specification (MMS) format defined in Chapter 6 of IEC61850-8-1-2004, and sends the coded message to the intelligent substation monitoring system;
the application module encodes the analyzed and obtained alternating-current voltage and alternating-current at intervals according to a sampling value message (SV) format of IEC61850-9-2-2004 to form a message, encodes the analyzed and obtained breaker and isolation disconnecting link opening and closing position information according to a General Object Oriented Substation Event (GOOSE) format of IEC61850-8-1-2004 appendix C to form a message, and sends the message to a system of a main transformer differential protection device, a bus protection device and a station area protection device;
the analog-to-digital conversion module obtains alternating voltage and alternating current from the current transformer and the voltage transformer which are arranged at intervals.
2. The intelligent substation bay protection control system of claim 1, wherein: the intelligent substation interval protection control system is respectively arranged on the intelligent substation interval protection control devices of each interval of the intelligent substation.
3. The intelligent substation bay protection control system of claim 2, wherein: the intelligent substation interval protection control device is provided with a management board, an application board, an input/output board and an analog-digital conversion board, wherein the management board, the application board, the input/output board and the analog-digital conversion board are connected by a management bus and a data bus.
4. The intelligent substation bay protection control system of claim 3, wherein: the application module is arranged on the application board, the input and output module is arranged on the input and output board, the analog-to-digital conversion module is arranged on the analog-to-digital conversion board, and the management module is arranged on the management board.
5. The intelligent substation bay protection control system of claim 4, wherein: and the management board establishes communication connection with the intelligent substation monitoring system through the external optical fiber 1.
6. The intelligent substation bay protection control system of claim 4, wherein: and the application board establishes communication connection with the intelligent substation network switch through the external optical fiber 2.
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|---|---|---|---|---|
| CN101465564A (en) * | 2009-01-09 | 2009-06-24 | 北京美兰尼尔电子技术有限公司 | In-situ digitalization method and apparatus for transforming plant primary equipment |
| CN105207353A (en) * | 2015-09-08 | 2015-12-30 | 国家电网公司 | Smart substation station domain protection control system framework |
| CN106532957A (en) * | 2016-12-20 | 2017-03-22 | 长园深瑞继保自动化有限公司 | On-site relay protection system |
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2019
- 2019-09-25 CN CN201910909917.6A patent/CN110729707B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101465564A (en) * | 2009-01-09 | 2009-06-24 | 北京美兰尼尔电子技术有限公司 | In-situ digitalization method and apparatus for transforming plant primary equipment |
| CN105207353A (en) * | 2015-09-08 | 2015-12-30 | 国家电网公司 | Smart substation station domain protection control system framework |
| CN106532957A (en) * | 2016-12-20 | 2017-03-22 | 长园深瑞继保自动化有限公司 | On-site relay protection system |
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