CN116646901B - Multi-terminal differential protection implementation method based on EtherCat - Google Patents
Multi-terminal differential protection implementation method based on EtherCat Download PDFInfo
- Publication number
- CN116646901B CN116646901B CN202310931418.3A CN202310931418A CN116646901B CN 116646901 B CN116646901 B CN 116646901B CN 202310931418 A CN202310931418 A CN 202310931418A CN 116646901 B CN116646901 B CN 116646901B
- Authority
- CN
- China
- Prior art keywords
- sub
- machine
- bus
- differential protection
- branch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000002955 isolation Methods 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 230000006870 function Effects 0.000 claims description 51
- 238000013461 design Methods 0.000 claims description 46
- 230000006854 communication Effects 0.000 claims description 25
- 238000004891 communication Methods 0.000 claims description 24
- 238000004364 calculation method Methods 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 13
- 230000000875 corresponding effect Effects 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 11
- 238000012423 maintenance Methods 0.000 claims description 9
- 241000272814 Anser sp. Species 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 5
- 238000010801 machine learning Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 3
- 238000012549 training Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013480 data collection Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 108010001267 Protein Subunits Proteins 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 210000002304 esc Anatomy 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000013598 vector Substances 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides an etherCat-based multi-terminal differential protection implementation method, which comprises the steps of designing a plan view of a power system, determining positions and paths of an I bus and an II bus, and installing wires and equipment; a first current transformer, a first circuit breaker and two branch isolation cutters are arranged on a branch, and a sub-machine is configured for system testing; installing a host, connecting the sub-machines to the host, and configuring through a network; then configuring software of a host according to a differential protection principle; connecting the device into a network using an ethernet cable; the sensor device is connected into the network and the upload frequency and data format of the sensor device are configured. The invention forms the ring network in a hand-in-hand manner, greatly simplifies the wiring of the system electrical cabinet, avoids the complexity of current collection access differential protection in the traditional transformer substation, and also avoids the problem that a large number of optical fibers are needed to be used in the intelligent transformer substation or information access is carried out in a switch manner.
Description
Technical Field
The invention relates to the field of power automation, in particular to an etherCat-based multi-terminal differential protection implementation method.
Background
In relay protection of a power system, differential protection is a core part, and occupies a main role in protection devices of power elements such as transformers, buses and the like. The basic principle of differential protection is based on kirchhoff's current law, i.e. under no fault condition, the sum of current vectors at all endpoints in the protection range is 0.
In a conventional transformer substation, transformer protection requires collection of current and voltage on three sides. This is typically accomplished by connecting the current cables on each side of the transformer (e.g., the high and low voltage sides and branches) to the main transformer protection device via cables. Such wiring is highly complex in field construction and requires many electrical leads, thereby reducing the stability of the system.
In an intelligent substation, the voltage and current signals of the main transformer come from merging units at intervals. Although the mode avoids the confusion of cables in the traditional transformer substation, a large number of optical fibers are needed to be directly connected by adopting point-to-point connection, a large number of optical cables are needed to be laid, the construction is complex, the optical fibers are easy to make mistakes in pulling and inserting, and the stability of the whole system is threatened.
The problem of bus protection is similar, a large number of cables are needed to be summarized to one or two (double) protection devices in the traditional mode, so that the field construction amount is large, the cost is high, and the system reliability is possibly reduced; in the intelligent substation, voltage and current signals of the bus come from merging units at intervals, and a large number of optical cables are required to be laid due to the adoption of point-to-point connection, so that the construction is complex, and the optical fiber plugging and unplugging errors can occur.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an etherCat-based multi-terminal differential protection implementation method, which fully exerts the unique advantages of etherCAT, uses etherCAT as a main communication architecture, reconstructs the differential protection of a power system transformer and a bus, and realizes high-performance differential protection in a concise communication topology connection mode.
To achieve the above object, the present invention provides a method for implementing multi-terminal differential protection based on etherCat, comprising
Step S1: designing a plan view of a power system, determining positions and paths of an I bus and an II bus, and installing wires and equipment;
step S2: a first current transformer, a first circuit breaker and two branch isolation cutters are arranged on a branch, and a sub-machine is configured for system testing;
step S3: installing a host, connecting the sub-machines to the host, and configuring through a network; then configuring software of a host according to a differential protection principle;
step S4: using an Ethernet cable of an RJ-45 interface to connect the devices in the steps S1-S3 into a network;
step S5: the sensor device is connected into the network and the upload frequency and data format of the sensor device are configured.
Further, step S1 is specifically to first design a plan view of the power system, and determine the positions and paths of the I bus and the II bus. The wires and associated equipment are then installed according to the design and ensure that all of the equipment is properly connected to the corresponding bus bar.
Further, step S2 further includes:
step S21: a first current transformer, a first circuit breaker and two branch isolation cutters are arranged on the branch;
step S22: according to the system design, selecting and installing the specific positions of the first current transformer, the first circuit breaker and the branch isolating knife;
step S23: configuring a branch slave machine and ensuring that the branch slave machine can be successfully connected to the first current transformer and the branch isolating knife;
step S24: carrying out system test, confirming that the branch sub-machine can normally collect data from the first current transformer and the branch isolating knife and can receive tripping commands sent by the main machine;
step S25: a position is selected in the system to be provided with a busbar, and the busbar comprises a second current transformer, a second circuit breaker and two busbar isolating cutters;
step S26: the mother-combined son machine is configured and connected to the second current transformer and the mother-combined isolating knife;
step S27: and (3) performing system test, and confirming that the bus-tie sub-machine can normally collect data from the second current transformer and the bus-tie isolating knife and can receive a tripping command sent by the host.
Further, step S4 specifically includes: first, a suitable location-mounted host is selected. Then, all the sub-machines are connected to the host machine and configured through the network, so that the host machine can receive information of all the sub-machines. And finally, configuring software of a host according to a differential protection principle, so that the software can finish large-difference and small-difference calculation, and simultaneously, transmitting branch trip information to a branch slave machine and transmitting bus-tie trip information to a bus-tie slave machine.
Further, step S5 specifically includes: first, network devices, such as switches and routers, are installed and configured, and then all devices are connected into the network using the ethernet cable of the RJ-45 interface. And finally, testing the connectivity and stability of the network, and ensuring that the data can be normally transmitted.
Further, the step S6 specifically includes: first, ioT (internet of things) sensors are installed for devices that need to be monitored, and then these sensors are connected into the network. Finally, the uploading frequency and data format of the sensor are configured so that the sensor can receive and process the data.
Further, the bus differential protection host design is also included, and the bus differential protection host design is specifically as follows:
step S71: a two CPU system architecture is designed and built, where CPU1 (e.g., ZYNQ-7020) is used to handle bus differential protection functions, and CPU2 (e.g., ZYNQ-7020) is used to handle EtherCat functions.
Step S72: CPU1 functional design: the following modules are designed and implemented for the CPU 1:
and the protocol module supports relay protection common protocols such as IEC61850, IEC103, GOOSE and the like.
And the wave recording module is compatible with fault wave recording of COMTRADE.
And the fixed value module supports fixed value management of a plurality of fixed value areas, and the fixed value is imported and exported.
And the reporting module can generate an operation report, an action report, a self-checking report and a deflection report.
And the differential protection calculation module supports the functions of large difference, small difference and tripping output.
The first data exchange module is used for exchanging data with the CPU2, sending the instruction results of the jump branch and the jump bus of the differential protection to the CPU2, and receiving the analog quantity and the position information of the branch and the bus sent by the CPU 2.
The first physical layer module comprises physical layer devices such as physical layer chips PHY, RJ45 and the like, the function of receiving and transmitting network messages is completed, and the network interface is provided with an external MMS station control layer communication interface and a GOOSE process layer communication function interface.
Step S73: CPU2 functional design: the following modules are designed and implemented for the CPU 2:
the EtherCat module can send tripping information of bus differential protection to the sub-machines of the plurality of branches, and the sub-machines of the bus connection are provided with the sub-machines for receiving the plurality of branches and are provided with data exchange with the data exchange module.
The second data exchange module is used for acquiring bus differential protection tripping information sent by the CPU1, transmitting the analog quantity and the position information of the plurality of branch sub-machines and the sub-machines connected in a bus mode to the CPU1, and is provided with data exchange with the EtherCat module.
And the Linux kernel patching module is used for patching the Linux kernel in real time to meet the real-time requirement in order to ensure the precision requirement of the distributed clock.
The second physical layer module comprises physical layer devices such as physical layer chips PHY and RJ45, and completes the receiving and transmitting functions of network messages, wherein the second physical layer module comprises two EtherCat network ports, a ring network structure can be formed through the two network ports, and the redundancy of equipment communication is improved.
Step S74: CPU1 and CPU2 data exchange: the data exchange mechanism is constructed and configured so that the CPU1 can send trip information of bus differential protection to the CPU2, and the CPU2 can send EtherCat acquisition information to the CPU1. The data exchange is performed through an RJ-45 interface, and a publish-subscribe mechanism based on a link layer is adopted, and the exchange frequency is 1ms to exchange once similar to the GOOSE protocol.
Further, the differential protection sub-machine design of the bus is also included, and the differential protection sub-machine design is specifically as follows:
step S81: etherCat sub-machine controller (ESC) module: an ESC module responsible for handling EtherCat data frames is selected and designed. The ESC extracts output command data from the data frame and stores it in the internal memory area as the data frame passes through the sub-machine. We recommend using ET1100 as a sub-machine controller chip.
Step S82: CPU module: an appropriate CPU, such as GD32, is selected and configured to perform the following functions:
the acquisition and execution functions: AD sampling is processed, and an on-off control function is started.
Data exchange function: and on the one hand, the CPU reads control data from the ESC to realize a tripping output function, and on the other hand, the CPU writes acquisition on and sampling data into the ESC and reads the data from the host.
Sampling synchronization function: ensuring that all the current data provided by the sub-machines must be provided with synchronized time information. EtherCAT has a distributed clock function, and the synchronization precision can reach the nanosecond level.
Step S83: a module for collecting current information of the branch is designed and configured.
Step S84: for the branch sub-machine, a module for collecting the cutter isolation position information of the branch is designed and configured; for the master-slave machine, a module for collecting the switch position information of the master-slave machine is designed and configured.
Step S85: and designing and configuring a trip module for executing trip information of each sub-machine of the bus differential protection pair.
Step S86: and designing and configuring a third physical layer module which comprises physical layer devices such as a physical layer chip PHY, an RJ45 and the like, and completing the transceiving function of the network message.
Further, the method also comprises the design of the operation information flow of the main ring network and the sub ring network, and the method is specifically as follows:
step S91: host download and processing: the differential protection EtherCAT host controls the data input and output of all the sub-machine devices. The host downloads state information of each sub-machine, completes calculation of electric quantity required by differential protection and differential protection logic, and uploads corresponding action results to each corresponding position of each sub-machine in the bundling frame respectively;
step S92: and (3) data exchange of the sub-machines: the sub-machines receive and process the data frames from the host machine in sequence. When each sub-machine receives the data frame, the sub-machine downloads the switch control command and the like of the main machine, and uploads the current, the position information and the like of the sub-machine. Then the data frame is forwarded to the next sub-machine;
step S93: data return to host: at the end of the link, after the last sub-machine (sub-machine n) finishes the data downloading and uploading of itself, all the data are packed and transmitted back to the host, thus finishing the transmission of the whole information flow.
Further, the differential protection design of the transformer is also included, and the differential protection design is specifically as follows:
step S101: and (3) configuring a power grid: firstly, setting a high-side bus, a middle-side bus and a low-side bus, and paying attention to the fact that the low-voltage side needs to be set into a double branch;
step S102: mounting a switch and a sub-machine device: a switch and a third Current Transformer (CT) are installed for each side face, and corresponding sub-machines are configured at the same time. The main task of the sub-machine is to collect CT information of each branch and receive a breaker tripping instruction of the main machine;
step S103: setting a host: the main machine needs to collect current information from three sides, calculate differential flow according to the differential protection principle, and send branch trip information to each side sub-machine;
step S104: establishing an EtherCAT ring network: communication is performed using an RJ-45 ethernet. The data frame is initiated by the host, sequentially passes through the first high-voltage side branch, the middle-voltage side branch, the second low-voltage side branch and the third low-voltage side branch, and finally returns to the host. The host completes information acquisition after receiving the data frame, and sends tripping information to each sub-machine;
step S105: reference and embodiment: according to the implementation scheme of bus differential protection, designing and executing a transformer differential protection host design scheme, a sub-machine design scheme, a main sub-machine redundant ring network design scheme and a main sub-ring network operation information flow design scheme;
step S106: maintenance and monitoring: the operation states of the main machine and the sub-machine are continuously monitored, and maintenance or adjustment is carried out according to the requirement so as to ensure the stable operation of the differential protection system and the safety of the power grid.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides an etherCat-based multi-terminal differential protection implementation method, wherein an etherCAT host does not need to purchase special hardware and only needs a common RJ-45 port. The EtherCAT sub-machine can be realized by using an ESC sub-machine controller chip with high integration and low cost provided by a supplier, and the CPU can be completed by adopting a single chip, which is beneficial to reducing the overall cost;
2. the invention provides an Ethernet Cat-based multi-terminal differential protection implementation method, which only needs network cables to connect all nodes to form a ring network in a hand-in-hand manner, greatly simplifies the wiring of a system electrical cabinet, avoids the complexity of current collection access differential protection in a traditional transformer substation, and also avoids the problem that a large number of optical fibers are needed in an intelligent transformer substation or information access is carried out in a switch manner. The improvement avoids insulation damage caused by long-distance cable laying, and reduces electrical quantity acquisition errors, state quantity acquisition errors and command signal errors;
3. the invention provides an EtherCat-based multi-terminal differential protection implementation method, which adopts a redundant ring network mechanism of EtherCAT, so that even if a single link fault occurs in a communication topology, an internal self-healing mechanism of EtherCAT can complete channel loop-back in a very short time, and basically ensures that a system does not lose a protection function;
4. the invention provides an EtherCat-based multi-terminal differential protection implementation method, wherein EtherCAT has a distributed clock function, the synchronization precision can reach nanosecond level, the high-precision synchronization performance ensures the synchronization of differential protection current sampling data, and differential protection misoperation caused by synchronization errors is effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the drawings needed in the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of a typical scheme for differential protection of a bus based on EtherCat;
FIG. 3 is a schematic diagram of a bus differential protection host design method;
FIG. 4 is a schematic diagram of a bus differential protection slave design method;
FIG. 5 is a schematic diagram of data frame processing;
FIG. 6 is a schematic diagram of the flow of information in the operation of the ring network of the differential protection EtherCat system;
FIG. 7 is a schematic diagram of an exemplary method of differential protection of a transformer based on EtherCat;
FIG. 8 is a flow chart of EtherCat messaging accuracy test;
FIG. 9 is a diagram of a message reception situation of a slave unit observed by an oscilloscope
FIG. 10 is a flow chart of a distributed clock tick precision test;
fig. 11 is a view of PPS synchronization of two slave units observed by an oscilloscope.
Description of the embodiments
The technical solution of the present invention will be more clearly and completely explained by the description of the preferred embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, a preferred embodiment of the present invention includes:
step S1: designing a plan view of a power system, determining positions and paths of an I bus and an II bus, and installing wires and equipment;
step S2: a first current transformer, a first circuit breaker and two branch isolation cutters are arranged on a branch, and a sub-machine is configured for system testing;
step S3: installing a host, connecting the sub-machines to the host, and configuring through a network; then configuring software of a host according to a differential protection principle;
step S4: using an Ethernet cable of an RJ-45 interface to connect the devices in the steps S1-S3 into a network;
step S5: the sensor is connected into the network, and the uploading frequency and the data format of the sensor are configured.
The apparatus described above may comprise a device for controlling,
bus bar equipment: the power supply comprises a primary power supply and a standby power supply, wherein the primary power supply and the standby power supply respectively correspond to the primary power supply and the standby power supply.
Branching device: comprises three branches and a branch sub-machine configured on each branch. The branch sub-machines are responsible for completing current information acquisition, knife separation information acquisition of the branch and receiving a branch tripping breaker command of the host machine.
The bus connection equipment comprises: comprises a bus, and a bus-bar sub-machine configured on the bus-bar. The master-slave machine completes current information acquisition of the master-slave machine, knife separation information acquisition and receiving a master-slave circuit breaker jump command of the host machine.
Host device: and the host computer is responsible for collecting current information and switching information of all branches and the bus, completing calculation of big difference and small difference according to a differential protection principle, and sending trip information to each sub-computer.
Sensor device: the device comprises a current transformer and an isolation knife switch, wherein the current transformer and the isolation knife switch are used for collecting current information and isolation knife information. The sensors send information to the branch sub-machine and the parent-branch sub-machine.
The method comprises the following steps:
designing a double-bus structure: the scheme includes two buses, I and II, respectively. This configuration may provide redundant paths, improving the reliability and flexibility of the system.
As a specific example, in an electrical power distribution system, the I and II buses may correspond to primary and backup power sources, respectively. Therefore, when the main power supply fails, the standby power supply can be quickly switched to ensure the stable operation of the power system.
And (3) branch design: the method comprises three branches, wherein each branch is provided with a branch sub-machine to complete current information acquisition, knife separation information acquisition and receive a branch tripping breaker command of a host machine.
As a specific example, one branch may include a power line from a power plant to an industrial area. The branch sub-machine is installed at the starting point or the end point of the line, periodically collects the current information of the line and the isolation switch information, and then sends the information to the host machine.
And (3) bus-tie design: the method comprises the steps of configuring a master-slave machine of the master-slave machine, completing current information acquisition, knife isolation information acquisition of the master-slave machine, and receiving a tripping master-slave circuit breaker command of a host machine.
As a specific example, a busbar may connect the grids of two cities. The bus-tie slave machine is arranged at one end of the bus-tie, acquires current information and isolation switch information of the bus-tie, and then sends the information to the host.
And (3) designing a host: the system comprises a host machine, wherein the host machine is used for collecting current information, knife isolating information, current information of a bus and switch information of all branches, calculating large difference and small difference according to a differential protection principle, and sending trip information to all sub-machines.
As a specific example, the host may be provided at a control center of the power system. The staff of the control center can monitor the current and isolation switch state of all branches and the bus in real time, and timely find and process possible problems.
EtherCat ring network: the communication in the system is realized through an EtherCat ring network, and can adopt RJ-45 Ethernet mode communication, a data frame is initiated by a host, sequentially passes through each branch and the bus, and finally returns to the host.
As a specific example, the host will send a frame of data at intervals, which includes the type of information that needs to be collected from each of the sub-machines. After receiving the data frame, the sub-machine adds corresponding information into the data frame, then sends the data frame to the next sub-machine, finally, the data frame returns to the host machine, and the host machine analyzes the data frame to obtain the information of all the sub-machines.
The calculation module for realizing big difference and small difference is integrated in the host computer in a hardware form, so that the calculation speed and accuracy are improved. And the fault prediction is performed by using an artificial intelligence technology, and the safety and traceability of the data are ensured by adopting a blockchain technology.
As a specific example, the host may be equipped with a special processor for performing the calculation of large and small differences. The system can train an artificial intelligent model according to historical data for predicting possible power system faults. All collected data may be stored in the blockchain to ensure data security and traceability.
Also included are predictive maintenance, the introduction of which may increase the stability and predictability of the system. The method comprises the following specific steps:
and (3) data collection: firstly, a sub-machine module is required to collect current information and switch position information of each branch. This information can be used for subsequent machine learning model training and prediction.
Establishing a machine learning model: from the collected data, a predictively maintained machine learning model is built. This model may be used to predict possible faults or anomalies. The creation of the model may involve data preprocessing, feature selection, model selection, training, and the like.
Model training and testing: the model is trained using historical data and a test set is used to verify the performance and accuracy of the model.
Prediction and maintenance: the trained model is deployed in a host. After collecting the current and the switching information of each sub-machine, the host machine inputs the data into the model to obtain a prediction result. Based on the prediction, the host may take necessary maintenance measures in advance, such as sending a maintenance signal or adjusting system parameters, to prevent the occurrence of a predicted failure or abnormality.
Model updating and optimizing: and according to the running condition and the prediction effect of the system, the machine learning model is updated and optimized regularly so as to ensure the prediction performance of the machine learning model.
In this way, predictive maintenance helps to improve the stability and predictability of the system.
The system also comprises an adaptive protection strategy, and the adaptive protection strategy can effectively treat dynamic change and diversified fault conditions of the power system. The method comprises the following specific steps:
and (3) establishing a protection parameter model: firstly, a protection parameter model is established, and the protection strategy parameters can be adjusted according to the real-time state of the power system by the model. This may involve current information, switch position information, and other factors that may affect the protection parameters.
Data collection and processing: and collecting real-time current information and switch position information through the sub-machine module, and sending the data into a host machine for processing.
Parameter adjustment: the host computer inputs the received data into a protection parameter model, and the model calculates the optimal protection parameter according to the input data. The host then applies these parameters to the system to adjust the protection policy.
Fault detection and response: the host detects the system state in real time, and if a possible fault or abnormality is found, decides what kind of measures to take, such as sending a trip signal or adjusting system parameters, according to the current protection parameters.
Model updating and optimizing: as with predictive maintenance, the protection parameter model needs to be updated and optimized periodically according to the system operation and protection effect to ensure its adaptability.
By introducing an adaptive protection strategy, dynamic changes and various fault conditions of the power system can be better handled.
As shown in fig. 2, the EtherCat-based bus differential protection typical diagram is a bus protection configuration of a double bus structure, the analog quantity to be accessed for the double bus differential protection includes current information of all branches and current information of bus branches, and the switching quantity information to be accessed includes the switching position of a bus link and the isolation switch position of all branches.
The bus differential protection can judge whether faults occur in a bus protection area or not by calculating the current differences of all the branches; and judging the branch information of the connection of the I bus (II bus) through the position of the isolation disconnecting link, and calculating all branch and bus-connected current on the I bus (II bus), wherein when both large and small differences act, the bus differential protection breaks away the fault bus.
The typical scheme of bus differential protection based on EtherCat has the following:
(1) The bus comprises two buses, namely an I bus and an II bus;
(2) Each branch comprises a current transformer (CT for short), a breaker, a cutter 1 and a cutter 2, and each branch is provided with a branch sub-machine which completes CT information acquisition of the branch, cutter information acquisition of the branch and a branch tripping breaker command of a receiving host;
(3) The bus-tie switch comprises 1 bus-tie, wherein the bus-tie switch comprises a current transformer (CT for short), a circuit breaker, a cutter 1 and a cutter 2, the bus-tie is provided with a bus-tie sub-machine, the bus-tie sub-machine completes CT information acquisition of a branch circuit, the bus-tie switch information acquisition is carried out, and a jump bus-tie circuit breaker command of a host machine is received;
(4) The system comprises 1 host machine, wherein the host machine is used for collecting current information, knife separation information, current information of a bus-tie and switching information of all branches, calculating large difference and small difference according to a differential protection principle, sending branch tripping information to a branch sub-machine, and sending the bus-tie tripping information to the bus-tie sub-machine;
(5) The system comprises an EtherCat ring network, wherein the EtherCat ring network can communicate in an RJ-45 Ethernet mode, a data frame is initiated by a host, sequentially passes through a branch 1, a branch 2, a branch 3 and a bus, and finally returns to the host, and the host completes information acquisition through the data frame and simultaneously sends tripping information to each sub-machine;
the bus differential protection system comprises a bus differential protection main machine design scheme, a bus differential protection sub-machine design scheme, a main sub-machine redundant ring network design scheme and a main sub-ring network operation information flow design scheme, and are explained in detail below.
As shown in fig. 3, in the design scheme of the bus differential protection host, the main function of bus differential protection based on EtherCat needs to complete two parts of functions, one part is the original bus differential protection function, the other part is the protocol processing function of EtherCat, and the two functions are completely independent, and in order to ensure the real-time requirement of the distributed clock of EtherCat, the EtherCat adopts a single CPU design.
The bus differential protection function needs to have function modules such as fixed value, report, protocol, wave recording and the like, and meets the standard requirements of relay protection.
In order to ensure the precision requirement of the distributed clock, the EtherCat needs to adopt a real-time operating system, and the invention adopts a Linux operating system, so that the kernel of the operating system needs to be patched in real time.
The bus differential protection host design scheme has the following contents:
(1) Two CPUs are adopted for distributed scheme design, the distributed scheme comprises two CPUs, a differential protection function is completed by the CPU1, and an EtherCat function is completed by the CPU 2. The CPU1 and the CPU2 select an SOC scheme which is ZYNQ-7020 in the device selection.
(2) The CPU1 includes all the functional requirements of differential protection.
The system comprises a protocol module, a relay protection module and a control module, wherein the protocol module is provided with relay protection common protocols such as IEC61850, IEC103, GOOSE and the like;
the fault wave recording module is compatible with COMTRADE;
the system comprises a fixed value module, a fixed value management module and a fixed value management module, wherein the fixed value module is provided with fixed value management of a plurality of fixed value areas, and fixed values are imported and exported;
the system comprises a reporting module, a control module and a control module, wherein the reporting module is provided with an operation report, an action report, a self-checking report and a deflection report;
the device comprises a differential protection calculation module, a tripping control module and a tripping control module, wherein the differential protection calculation module has a large difference and a small difference and has a tripping output function;
comprises a data exchange module, which is provided to exchange data with the CPU 2. The exchanged data includes: the instruction results of the jump branch and the jump bus of the differential protection are required to be sent to the CPU2, and the analog quantity and the position information of the branch and the bus sent by the CPU2 are required to be received;
the system comprises a physical layer module, which comprises physical layer devices such as a physical layer chip PHY, RJ45 and the like, and completes the function of receiving and transmitting network messages, and a network interface is provided with an external MMS station control layer communication interface and a GOOSE process layer communication function interface.
(3) The CPU2 includes all the functional requirements of EtherCat.
The system comprises an EtherCat module, a master-slave unit and a data exchange module, wherein the EtherCat module is provided with slave units for a plurality of branches, the master-slave unit sends tripping information of bus differential protection, and the slave units are provided with the slave units for receiving the plurality of branches and are provided with data exchange with the data exchange module;
the data exchange module is provided with a bus differential protection tripping information transmitted by the CPU1, a plurality of branch slaves, a master slave analog quantity and position information of the master slave are transmitted to the CPU1, and the data exchange module is provided with data exchange with the EtherCat module.
The method comprises a linux kernel patch module, and is characterized in that in order to ensure the accuracy requirement of a distributed clock, the message transmission control accuracy requirement of a host is higher, jitter cannot exist, the EtherCat adopts a 1ms transmission period, and the transmission deviation does not exceed plus or minus 200us, so that real-time patching of the linux kernel is required to meet the real-time requirement.
The network communication system comprises a physical layer module, comprises physical layer devices such as a physical layer chip PHY and an RJ45, and achieves the function of receiving and transmitting network messages, wherein the network device comprises two EtherCat network ports, a ring network structure can be formed through the two network ports, and compared with a star type structure and a tree structure, the redundancy of equipment communication is improved.
(4) Data exchange between CPU1 and CPU2
The CPU1 needs to send trip information of bus differential protection to the CPU2, and the CPU2 needs to send EtherCat acquisition information to the CPU1. The CPU1 and the CPU2 exchange data through RJ-45 interfaces, the exchange protocol is a link layer-based publish-subscribe mechanism, and similar to the GOOSE protocol, the exchange frequency is exchanged once in 1 ms.
As shown in fig. 4, the sub-units of the bus differential protection are divided into a branch sub-unit and a bus-connected sub-unit, and the branch sub-unit and the bus-connected sub-unit are not different in implementation principle, and the branch sub-unit is described below. The sub-machine mainly completes two functions of EtherCat communication and acquisition control, and comprises an ESC module, a CPU module, an alternating current acquisition module, an opening-in module, an opening-out module and a physical layer module.
EtherCat sub-machine controller (ESC) module
The ESCs are responsible for processing EtherCat data frames, and each sub-machine ESC sequentially shifts read-write data frames according to the physical positions of the sub-machines ESC on the ring. When the message passes through the sub-machine, the ESC extracts the output command data sent to itself from the message and stores the output command data in the internal storage area, and the input data is written into the corresponding sub-message from the internal storage area. The extraction and insertion of data is done automatically by the data link layer hardware, which is fast. The communication process with the host is handled entirely by the ESC, independent of CPU response time.
The ESC is a core device controlled by the slave machine, a special cost-effective slave machine controller chip ESC can be adopted, and the invention recommends to adopt the ET1100 with the multiple benefits.
CPU module
The CPU may employ GD32, including three functions of acquisition execution, data exchange, and sample synchronization. The specific explanation is as follows:
the acquisition and execution functions: the CPU is responsible for processing AD sampling and controlling the on-off of the switch;
data exchange function: the CPU completes communication and control with the ESC, on one hand, the CPU reads control data from the ESC to realize a tripping output function, and on the other hand, the CPU writes acquisition on-off and sampling data into the ESC and reads the data from the host.
Sampling synchronization function: differential protection calculations require that the sampled data be very synchronous and therefore that the current data provided by all the sub-machines must be provided with synchronous time information. EtherCAT has a distributed clock function, and the synchronization precision can reach the nanosecond level. All EtherCAT sub-machines are synchronous, and all adopt a reference clock and share one set of system time. The reference clock adopts Beijing time of 2000 years 1 month 1 day 00:00 is used as a starting point, the minimum unit is 1ns, 64 bits are adopted for counting, all sampling data with time stamp information are summarized to a host, and the host can perform data synchronization according to the same time stamp information of each sub-machine, so that logic calculation of differential protection is completed.
Alternating current acquisition module
The branch needs to collect current information of the branch;
inlet module
The branch sub-machine is required to acquire the cutter isolation position information of the branch, and the main sub-machine is required to acquire the switch position information of the main sub-machine;
opening module
The starting module mainly completes the trip information execution of each sub-machine of the bus differential protection pair;
physical layer module
The physical layer module comprises physical layer devices such as physical layer chips PHY, RJ45 and the like, and the function of receiving and transmitting network messages is completed.
The main and sub machine ring networks as shown in fig. 5 adopt ring networks instead of star networks, on one hand, for the purpose of simple site construction, no need of configuring a switch, and data communication is realized by adopting a hand-in-hand manner; on the other hand, communication redundancy is mainly provided, and when a single failure occurs in the network, the network can be rapidly switched to the redundant network.
The specific redundant ring network operation scheme is as follows:
the normal procedure data frame processing is as shown in fig. 5 (a): only the main frame (the frame sent by the main network card and the frame received by the redundant network card) is valid, and the redundant frame (the frame sent by the redundant network card and the frame received by the main network card) is invalid, and the process data of the main frame is the process data of the application layer.
Under the condition of single-point fault, if the network cables of the sub-machine 2 and the sub-machine 3 are interrupted, the data frame processing is as shown in (b) of fig. 5, if the sub-machine 2 judges that the communication is faulty, the loop is automatically looped, and the communication is returned to the host machine according to the original path; and the slave machine 3 judges that the communication fails, automatically loops back and returns to the host machine according to the original path. The main frame and the redundant frame are valid, wherein the sub-machine 1 and the sub-machine 2 are based on the main frame data, and the sub-machine 3 is based on the redundant frame data.
As shown in fig. 6, the ring network operation adopts a redundant operation, and is based on the implementation of the bundling frame. The specific frame format information of the bundling frame needs to be executed with reference to EtherCAT standard, and only the information transfer process of the application data is described here, and the main frame is taken as an example:
(1) The differential protection EtherCAT host controls the data input and output of all the sub-machine devices, the host downloads the state information of each sub-machine, the host completes the calculation of the electric quantity and the differential protection logic required by the differential protection, and the corresponding action results are respectively uploaded to the corresponding positions of each sub-machine in the bundling frame.
(2) The slave unit 1 receives the data frame of the differential protection master unit, downloads the switch control command and the like of the slave unit 1, uploads the current, the position information and the like of the slave unit 1, and forwards the current, the position information and the like to the slave unit 2.
(3) Similarly, the same logic is executed by the slave unit 2 as that executed by the slave unit 1, and the same logic is transferred to the slave unit 3, and so on until the slave unit n.
(4) In the sub-machine n, after the sub-machine n finishes the data downloading and uploading of the sub-machine n, all the data are packed and transmitted to the host, so that the transmission of the whole information flow is finished.
As shown in fig. 7, the transformer differential protection is similar to the bus differential protection implementation principle, except that the transformer differential protection obtains current information and position information of high and low sides, and a typical scheme of the transformer differential protection is given here.
The transformer differential protection typical diagram based on EtherCat is a three-roll transformer configuration, and the analog quantity to be connected to the transformer differential protection comprises current information of three sides of high, medium and low, and does not need to be connected to switching value information.
The differential protection of the transformer can judge whether a fault occurs in a transformer protection area by calculating the current difference of three sides, and when the differential protection acts, the differential protection breaks the three-side switch.
The typical scheme of transformer differential protection based on EtherCat has the following:
(1) The bus comprises a high-middle low-side bus, wherein the low-voltage side is a double branch;
(2) The low-voltage side double-branch switch comprises a three-side switch, wherein each side comprises a Current Transformer (CT) and a breaker, each side sub-machine is configured, the sub-machine completes CT information acquisition of a branch, and a branch-tripping breaker command of a host is received;
(3) The differential protection system comprises 1 host machine, wherein the host machine is used for completing collection of current information of three sides, completing differential flow calculation according to a differential protection principle, and sending branch trip information to each side sub-machine;
(4) The system comprises an EtherCat ring network, wherein the EtherCat ring network can communicate in an RJ-45 Ethernet mode, a data frame is initiated by a host, sequentially passes through a high-voltage side, a medium-voltage side, a low-voltage side branch I and a low-voltage side branch II, and finally returns to the host, the host completes information acquisition through the data frame, and simultaneously sends tripping information to each sub-machine;
(5) The design scheme of the transformer differential protection host, the design scheme of the sub-machines, the design scheme of the main-sub-machine redundant ring network and the design scheme of the main-sub ring network operation information flow are executed by referring to bus differential protection.
As shown in fig. 8-11, the key data index test is specifically as follows:
test 1: the bus differential protection host transmits EtherCat message through 1ms frequency, if EtherCat message is received at the slave side, rising edge level is generated, the change frequency of level is observed at the oscilloscope, and it can be found that the slave machine can receive a frame of EtherCat message stably at 1ms interval.
Test 2: the bus differential protection host sends EtherCat message through 1ms frequency, and according to PPS signal of the sub-machine, the distributed time setting precision of different sub-machines is compared, and the time setting precision is found to be less than 100ns by observing the oscilloscope.
The test environment shows that the EtherCat ring network is formed by the master differential protection, the branch sub-machine 1 and the branch sub-machine 2, and the PPS output of the branch sub-machine is connected, and the observation is carried out on an oscilloscope.
The above detailed description is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Various modifications, substitutions and improvements of the technical scheme of the present invention will be apparent to those skilled in the art from the description and drawings provided herein without departing from the spirit and scope of the invention. The scope of the invention is defined by the claims.
Claims (6)
1. The method for realizing the multi-terminal differential protection based on the EtherCat is characterized by comprising the following steps of
Step S1: designing a plan view of a power system, determining positions and paths of an I bus and an II bus, and installing wires and equipment;
step S2: a first current transformer, a first circuit breaker and two branch isolation cutters are arranged on a branch, and a sub-machine is configured for system testing;
step S3: installing a host, connecting the sub-machines to the host, and configuring through a network; then configuring software of a host according to a differential protection principle;
step S4: using an Ethernet cable of an RJ-45 interface to connect the devices in the steps S1-S3 into a network;
step S5: connecting the sensor device into a network, and configuring the uploading frequency and the data format of the sensor device;
the bus differential protection host design is also included, and the bus differential protection host design is specifically as follows:
step S61: designing and constructing a system architecture of two CPUs, wherein a CPU1 is used for processing a bus differential protection function, and a CPU2 is used for processing an EtherCat function;
step S62: CPU1 functional design: the following modules are designed and implemented for the CPU 1:
the protocol module supports relay protection common protocols;
the wave recording module is compatible with fault wave recording of COMTRADE;
the fixed value module supports fixed value management of the fixed value area, and the fixed value is imported and exported;
the report module generates an operation report, an action report, a self-checking report and a deflection report;
the differential protection calculation module supports a large difference and a small difference and a tripping output function;
the first data exchange module is used for carrying out data exchange with the CPU2, sending the instruction results of the jump branch and the jump bus of the differential protection to the CPU2, and receiving the analog quantity and the position information of the branch and the bus sent by the CPU 2;
the first physical layer module is used for completing the receiving and transmitting functions of network messages, and the network interface is provided with an external MMS station control layer communication interface and a GOOSE process layer communication function interface;
step S63: CPU2 functional design: the following modules are designed and implemented for the CPU 2:
the EtherCat module can send tripping information of bus differential protection to the sub-machines of a plurality of branches, and the sub-machines of the bus connection are provided with the sub-machines of the receiving branch and the data exchange with the data exchange module;
the second data exchange module is used for acquiring bus differential protection tripping information sent by the CPU1, transmitting the analog quantity and the position information of the plurality of branch sub-machines and the sub-machines connected in a bus mode to the CPU1, and is provided with data exchange with the EtherCat module;
the Linux kernel patching module patches the Linux kernel in real time to meet the real-time requirement;
the second physical layer module is used for completing the receiving and transmitting functions of network messages and comprises two EtherCat network ports through which a ring network structure can be formed;
step S64: CPU1 and CPU2 exchange data;
the design of the bus differential protection sub-machine is also included, and the design is specifically as follows:
step S71: selecting and designing an ESC module responsible for processing EtherCat data frames;
step S72: selecting and configuring an appropriate CPU for performing the following functions:
the acquisition and execution functions: processing AD sampling, and switching on and switching off a control function;
data exchange function: the communication and control with the ESC are completed, on one hand, the CPU reads control data from the ESC to realize a tripping output function, and on the other hand, the CPU writes the acquisition start and sampling data into the ESC and reads the data from the host;
sampling synchronization function: ensuring that current data provided by the sub-machine must have synchronous time information, wherein EtherCAT has a distributed clock function, and the synchronous precision can reach nanosecond level;
step S73: designing and configuring a module for collecting current information of the branch circuit;
step S74: for the branch sub-machine, a module for collecting the cutter isolation position information of the branch is designed and configured; for the master-link slave machine, a module for collecting the position information of a switch of the master-link is designed and configured;
step S75: designing and configuring a starting module for executing trip information of each sub-machine of the bus differential protection pair;
step S76: designing and configuring a branch physical layer module which comprises a branch physical layer device to complete the receiving and transmitting functions of network messages;
the method also comprises the steps of designing the operation information flow of the main ring network and the sub ring network, and specifically comprises the following steps:
step S81: the differential protection EtherCAT host controls the data input and output of the sub-machine equipment, the host downloads the state information of each sub-machine, completes the calculation of the electric quantity required by differential protection and the differential protection logic, and uploads the corresponding action result to each corresponding position of each sub-machine in the bundling frame;
step S82: the sub-machine sequentially receives and processes the data frames from the host machine according to the sequence, when the sub-machine receives the data frames, the sub-machine downloads the switch control command of the host machine to the sub-machine, uploads the current and the position information of the sub-machine, and then forwards the data frames to the next sub-machine;
step S83: at the tail end of the link, after the last sub-machine finishes the data downloading and uploading of the sub-machine, all the data are packed and transmitted back to the host machine, so that the transmission of the whole information flow is finished;
the differential protection design of the transformer is also included, and the differential protection design is specifically as follows:
step S91: firstly, setting a high-side bus, a middle-side bus and a low-side bus, and paying attention to the fact that the low-voltage side needs to be set into a double branch;
step S92: a switch and a third current transformer are arranged for each side face, and corresponding sub-machines are configured at the same time;
step S93: the main machine needs to collect current information from three sides, calculate differential flow according to the differential protection principle, and send branch trip information to each side sub-machine;
step S94: communication is carried out by using an RJ-45 Ethernet mode;
step S95: according to the implementation scheme of bus differential protection, designing and executing a transformer differential protection host design scheme, a sub-machine design scheme, a main sub-machine redundant ring network design scheme and a main sub-ring network operation information flow design scheme;
step S96: the operation states of the main machine and the sub-machine are continuously monitored, and maintenance or adjustment is carried out according to the requirement so as to ensure the stable operation of the differential protection system and the safety of the power grid.
2. The method for realizing multi-terminal differential protection based on etherCat according to claim 1, wherein step S1 is specifically:
step S11: designing a plan view of a power system, and determining positions and paths of an I bus and an II bus;
step S12: installing wires and related equipment according to the design drawing;
step S13: ensuring that the devices are properly connected to the corresponding bus bars.
3. The method for implementing multi-terminal differential protection based on etherCat according to claim 1, wherein step S2 further comprises:
step S21: a first current transformer, a first circuit breaker and two branch isolation cutters are arranged on the branch;
step S22: according to the system design, selecting and installing the specific positions of the first current transformer, the first circuit breaker and the branch isolating knife;
step S23: configuring a branch slave machine and ensuring that the branch slave machine can be successfully connected to the first current transformer and the branch isolating knife;
step S24: carrying out system test, confirming that the branch sub-machine can normally collect data from the first current transformer and the branch isolating knife and can receive tripping commands sent by the main machine;
step S25: a position is selected in the system to be provided with a busbar, and the busbar comprises a second current transformer, a second circuit breaker and two busbar isolating cutters;
step S26: the mother-combined son machine is configured and connected to the second current transformer and the mother-combined isolating knife;
step S27: and (3) performing system test, and confirming that the bus-tie sub-machine can normally collect data from the second current transformer and the bus-tie isolating knife and can receive a tripping command sent by the host.
4. The method for implementing multi-terminal differential protection based on etherCat according to claim 1, wherein step S3 is specifically: selecting a proper position to install a host, connecting the sub-machines to the host, and configuring the sub-machines through a network to ensure that the host can receive information of all the sub-machines; according to the differential protection principle, the software of the host is configured, so that the software of the host can finish large difference and small difference calculation, and meanwhile, the branch trip information can be sent to the branch sub-machine, and the bus-tie trip information is sent to the bus-tie sub-machine.
5. The method for implementing multi-terminal differential protection based on etherCat according to claim 1, wherein step S4 is specifically: installing and configuring network devices; connecting the device into a network using an ethernet cable of an RJ-45 interface; and testing the connectivity and stability of the network, and ensuring that the data can be normally transmitted.
6. The method for implementing multi-terminal differential protection based on etherCat according to claim 1, wherein step S5 is specifically: installing IoT sensors for devices that need to be monitored; connecting the sensors into a network; the uploading frequency and data format of the sensor are configured so that the computer can receive and process the data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310931418.3A CN116646901B (en) | 2023-07-27 | 2023-07-27 | Multi-terminal differential protection implementation method based on EtherCat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310931418.3A CN116646901B (en) | 2023-07-27 | 2023-07-27 | Multi-terminal differential protection implementation method based on EtherCat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116646901A CN116646901A (en) | 2023-08-25 |
| CN116646901B true CN116646901B (en) | 2023-09-29 |
Family
ID=87625197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310931418.3A Active CN116646901B (en) | 2023-07-27 | 2023-07-27 | Multi-terminal differential protection implementation method based on EtherCat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116646901B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001286055A (en) * | 2000-04-04 | 2001-10-12 | Toshiba Corp | Multiterminal protective relay for transmission line |
| CN103336471A (en) * | 2013-06-14 | 2013-10-02 | 华南理工大学 | Servo motion control card based on EtherCAT network communication |
| CN104410052A (en) * | 2014-09-29 | 2015-03-11 | 国家电网公司 | Current differential protection system based on PON communication and protection method of current differential protection system |
| CN106451371A (en) * | 2016-12-12 | 2017-02-22 | 广东电网有限责任公司电力调度控制中心 | Misoperation prevention operation method for bus differential protection when bus T-zone is discharged and device thereof |
| CN107069681A (en) * | 2017-04-27 | 2017-08-18 | 许继电气股份有限公司 | A kind of multi-point circuit differential protecting method and system |
| EP3232527A1 (en) * | 2016-04-13 | 2017-10-18 | General Electric Technology GmbH | Method of operating a differential protection scheme |
| CN108377265A (en) * | 2018-02-07 | 2018-08-07 | 南京南瑞继保电气有限公司 | The real-time synchronization method of control protection distributed system in a kind of electric system |
| CN110601149A (en) * | 2019-09-23 | 2019-12-20 | 江苏联能电力科学研究院有限公司 | Bus protection method and device based on redundant differential current judgment |
| CN110989402A (en) * | 2019-12-30 | 2020-04-10 | 上海科梁信息工程股份有限公司 | Information acquisition system and method |
| CN116192564A (en) * | 2023-05-04 | 2023-05-30 | 安徽中科智充新能源科技有限公司 | Quick control system of energy storage power station based on EtherCAT looped netowrk framework |
-
2023
- 2023-07-27 CN CN202310931418.3A patent/CN116646901B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001286055A (en) * | 2000-04-04 | 2001-10-12 | Toshiba Corp | Multiterminal protective relay for transmission line |
| CN103336471A (en) * | 2013-06-14 | 2013-10-02 | 华南理工大学 | Servo motion control card based on EtherCAT network communication |
| CN104410052A (en) * | 2014-09-29 | 2015-03-11 | 国家电网公司 | Current differential protection system based on PON communication and protection method of current differential protection system |
| EP3232527A1 (en) * | 2016-04-13 | 2017-10-18 | General Electric Technology GmbH | Method of operating a differential protection scheme |
| CN106451371A (en) * | 2016-12-12 | 2017-02-22 | 广东电网有限责任公司电力调度控制中心 | Misoperation prevention operation method for bus differential protection when bus T-zone is discharged and device thereof |
| CN107069681A (en) * | 2017-04-27 | 2017-08-18 | 许继电气股份有限公司 | A kind of multi-point circuit differential protecting method and system |
| CN108377265A (en) * | 2018-02-07 | 2018-08-07 | 南京南瑞继保电气有限公司 | The real-time synchronization method of control protection distributed system in a kind of electric system |
| CN110601149A (en) * | 2019-09-23 | 2019-12-20 | 江苏联能电力科学研究院有限公司 | Bus protection method and device based on redundant differential current judgment |
| CN110989402A (en) * | 2019-12-30 | 2020-04-10 | 上海科梁信息工程股份有限公司 | Information acquisition system and method |
| CN116192564A (en) * | 2023-05-04 | 2023-05-30 | 安徽中科智充新能源科技有限公司 | Quick control system of energy storage power station based on EtherCAT looped netowrk framework |
Non-Patent Citations (1)
| Title |
|---|
| 智能变电站自同步母线差动保护研究;陈雷;中国优秀硕士论文电子期刊网;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116646901A (en) | 2023-08-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3301784B1 (en) | Intelligent power server applied to protection and control system for intelligent substation | |
| CN104995574B (en) | Oil field Process Control System | |
| US10833507B2 (en) | Island detection and control of a microgrid | |
| JP5144993B2 (en) | Power network protection control system with signal and command interface in main equipment | |
| CN105281435A (en) | Intelligent distribution network oriented distribution type fault detection and isolation system and working method | |
| CN102097856B (en) | Spare power automatic switching programmable logic control method for plant supply of power station | |
| CN106602514B (en) | A kind of substation areas of transformer station dead zone protection system shared based on station domain information | |
| CN104993596A (en) | A distribution network automation remote terminal unit based on embedded multiple ARM processors | |
| CN112134293A (en) | Station terminal public unit and wide area autonomous method based on edge calculation | |
| CN110518703A (en) | A kind of distributed protection measure and control device and method | |
| CN113131448A (en) | Intelligent distributed feeder line method and device based on 5G communication | |
| CN114006804B (en) | Distribution edge server system based on centralized protection control system architecture | |
| CN110350516B (en) | Automatic identification method for single-ring network topology of high-voltage distribution network | |
| CN113364120B (en) | Method, device and equipment for checking control process of intelligent substation and storage medium | |
| KR101048496B1 (en) | Remote Power Control System Using Distributed Network Protocol | |
| EP2977838B1 (en) | Process of monitoring intelligent electronic devices installed in an electrical power system | |
| CN116646901B (en) | Multi-terminal differential protection implementation method based on EtherCat | |
| CN111327474A (en) | Power system fault diagnosis method based on topology analysis | |
| Huang | A practical guide of troubleshooting IEC 61850 GOOSE communication | |
| CN111478188B (en) | Intelligent high-voltage switch | |
| Amjadi et al. | IEC61850 GOOSE performance in real time and challenges faced by power utilities | |
| CN202696289U (en) | Low voltage power distribution monitoring system | |
| CN106160226B (en) | Method for improving PTP time synchronization precision of intelligent substation | |
| Jiang et al. | Reliability analysis of future special protection schemes | |
| CN115051475B (en) | Multi-terminal closed-loop joint debugging system and method based on analog state device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |