CN113270017B - Modeling method of relay protection simulation system - Google Patents
Modeling method of relay protection simulation system Download PDFInfo
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- CN113270017B CN113270017B CN202110603846.4A CN202110603846A CN113270017B CN 113270017 B CN113270017 B CN 113270017B CN 202110603846 A CN202110603846 A CN 202110603846A CN 113270017 B CN113270017 B CN 113270017B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
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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
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Abstract
A modeling method of a relay protection simulation system comprises the following steps of 1: establishing an equipment model by taking primary equipment as a main body based on an object-oriented technology; step 2, establishing a mapping relation between equipment, protection, mutual inductor and circuit breaker by an active topology matching technology; step 3, after the short circuit simulation is started, searching short circuit points on the main wiring diagram, determining the physical node numbers of the short circuit points, comparing the numbers with the position attributes of the equipment model one by one, determining the positions of the short circuit points, and the like; the invention aims to solve the technical problems that the existing relay protection simulation system is poor in system model flexibility and poor in universality, needs to be redeveloped and configured when the main wiring mode and the equipment configuration are changed, and the simulation result is possibly inconsistent with the actual situation in a special operation mode.
Description
Technical Field
The invention belongs to the field of relay protection of power systems, and particularly relates to a modeling method and a modeling method of a relay protection simulation system.
Background
The relay protection is key equipment for ensuring safe, reliable and stable operation of the power system, and the handling capacity of operation personnel for handling faults can be improved by carrying out simulation training on the faults and the relay protection. The relay protection configuration and the coordination logic between the protection of the transformer substation are closely related to the main wiring mode.
In the existing simulation training system, a relay protection simulation model is developed according to protection configuration, a protection action principle, protection coordination logic and device logic customization aiming at specific main wiring, the model is poor in flexibility and insufficient in universality, when the mode of the main wiring and the equipment configuration are changed, the model needs to be re-developed and configured, a simulation result is possibly inconsistent with an actual condition under a special operation mode, and if large-scale simulation training is to be carried out on a plurality of substations in a power grid jurisdiction at the same time, the model development workload is too large, and the training requirement is difficult to meet.
Disclosure of Invention
The invention aims to solve the technical problems that the existing relay protection simulation system is poor in system model flexibility and poor in universality, needs to be redeveloped and configured when the main wiring mode and the equipment configuration are changed, and the simulation result is possibly inconsistent with the actual situation in a special operation mode.
A modeling method of a relay protection simulation system comprises the following steps:
step 1, establishing an equipment model by taking primary equipment as a main body based on an object-oriented technology;
wherein the equipment model comprises: the device comprises a transformer, a bus, a line, a circuit breaker, a current transformer, a voltage transformer, a cable and a reactor.
In the step 1, a modeling object is protected equipment, the configuration, the principle and the characteristics of relay protection are taken as protection attributes, and the protection attributes, the topological attributes and the state attributes of the equipment are encapsulated by adopting an object-oriented technology; the equipment model includes: the device comprises a transformer, a bus, a line, a circuit breaker, a current transformer, a voltage transformer, a cable and a reactor.
Wherein each model is given 3 types of attributes: a topology attribute, a state attribute, and a protection attribute;
topological property: the method is characterized in that the real-time updating is carried out according to the calculation result in the simulation process, the characteristics of the equipment in the main wiring are reflected, and the method comprises the following steps: location attributes, connection attributes, electrical attributes. The position attribute characterizes the position of the equipment on the main wiring, and the position is expressed by the physical port number of the equipment; the connection attribute represents the connection relation between the equipment and other equipment and is identified by the logical port number of the equipment; the electrical properties characterize the location of the electrical island where the device is located, denoted by a serial number.
State attribute: and the state quantity of the equipment is represented, and is updated in real time according to the calculation result in the simulation calculation process. Including the port voltage, port current, throw and direction of the device. The port voltage and the port current are voltage values and current values calculated by the device in real time in simulation; direction represents the direction of current flow; the switching represents whether the state of the model on the main wiring is switched on or switched off, the circuit breaker, the voltage transformer and the current transformer have switching attributes, and the switching attributes of other equipment are set as switching on and off by default, so that the attribute is not needed.
Protection property: reflecting the protection situation configured by the equipment, comprising the following steps: protection device type, protection constant value, starting variable, action time, action outlet, action principle and protection on/off. The device type, the protection fixed value and the action time are set in advance in an external editing mode when a model is built, and once the set values are set, the device type, the protection fixed value and the action time cannot change in the simulation process; protection switching can be carried out at any time through an interface of the simulation system according to the training requirement in the simulation process. The voltage transformer and the current transformer only need to protect the attributes of the types, and other attributes do not need. The starting variable is a protection variable and is related to a protected object and a protection type, and the starting variable is automatically updated in the simulation process. The action principle is a protected action model, accords with the most basic protection action principle, is suitable for all protection, and is preset in the model.
Step 2, establishing a mapping relation between equipment, protection, mutual inductor and circuit breaker by an active topology matching technology;
when the mapping relation is established, the method comprises the following steps:
1) the device type, the device number and the port number of the device on the main connection line can be obtained by searching the connection line on the main connection line, the physical port number of the device is obtained by fusing the connection lines, and the position attribute of the model is updated.
2) And forming a logic port number through mutual inductor fusion and switch fusion, and updating the connection attribute of the model.
3) And fusing the logic ports to form an electrical island and updating the electrical property of the equipment model.
4) And carrying out load flow calculation by using the electric island to obtain the current direction, the port voltage and the port current, and updating the state attribute of the model.
5) Respectively scanning models of a transformer, a bus, a line, a cable and a breaker, respectively using the transformer, the bus, the line, the cable and the breaker as an equipment main body, scanning the equipment main body one by one according to a strategy of the equipment main body-a mutual inductor-the breaker, and establishing a mapping relation between protection-the mutual inductor-the breaker according to connection attributes of the equipment main body, the mutual inductor and the breaker;
6) according to the mapping relation of protection-mutual inductor-circuit breaker, updating the protection attribute of the equipment, including: the protection system comprises a protection outlet and a starting variable, wherein the protection outlet is a corresponding circuit breaker, and the starting variable of the protection is a current value and a voltage value of equipment. Once the mapping is established successfully, the mapping does not need to be modified later, and only the attribute needs to be updated in real time;
step 3, searching short-circuit points on the main wiring diagram, determining the physical node numbers of the short-circuit points, comparing the numbers with the position attributes of the equipment model one by one, and determining the positions of the short-circuit points;
step 4), repeating the step 2) and the step 3) in the step 2), and updating the logic node number and the electric island number in the equipment model;
step 5, starting short circuit calculation to obtain a current direction, a port voltage and a port current, and updating direction attributes, an electric island, the port voltage, the port current and starting variables in all models;
step 6, searching and comparing the direction attribute and the topology attribute of the equipment to determine which equipment is involved in the fault;
step 7, respectively executing the actions in the model according to the distance from the short circuit point to the equipment determined in the step 6;
step 8, after the breaker is disconnected, updating the switching attribute in the breaker model, repeating the step 3), the step 4) and the step 5) in the step 2, and updating topology information, protection information and state information in all equipment models;
at this point, one fault simulation is finished, and if the next fault simulation needs to be performed, the process can be directly started from step 2.
In step 5) of step 2, during scanning, the connection attribute of "device main body-transformer-breaker" is scanned first, which transformers and breakers corresponding to the device main body are determined, then the transformers and breakers are scanned, and the transformers and breakers corresponding to each protection are determined according to the position attribute and the direction attribute.
In step 6, the strategy used is as follows:
if the models have the same electrical island and directional properties, then the device is within the short circuit range;
and detecting the physical port number of the equipment model in the range, wherein the closer to the port number of the short circuit point, the closer to the short circuit of the equipment is.
In step 7, when the action in the model is executed, the following steps are adopted with respect to the protection investment:
checking protection switching in the protection attribute, if the value is protection switching, starting the following process, otherwise jumping out of the process;
the process comprises the following steps:
checking attributes such as a protection constant value, a starting variable, action time, an action exit and the like in the protection attribute;
the magnitudes of the actuation variable and the protection constant are compared,
when the starting variable (such as current) is larger than the protection fixed value, timing is started; when the timing is longer than the action time, the circuit breaker corresponding to the protection outlet is disconnected (the state attribute of the circuit breaker is set as exit), the timing is reset, and the flow is skipped;
when the starting variable (such as current) is smaller than the protection fixed value, the timing is cleared and the process is skipped.
Compared with the prior art, the invention has the following technical effects:
1) according to the relay protection simulation model provided by the invention, relay protection and a protected object are integrated, an equipment model is constructed by an object-oriented technology, special attributes and a basic protection action principle are given to the model, the attributes of the model are automatically updated by an active topology analysis technology, a relay protection system model matched with a main wiring is automatically constructed, and the requirement of large-scale simulation training is effectively met;
2) the relay protection system provided by the invention can be automatically configured according to the main wiring diagram and the operation mode of the main wiring, the relay protection principle is strictly simulated in the protection action process, the logic matching relation of different protections can be naturally realized, and even if the complex conditions of operation mode, equipment state change, protection non-input and the like occur, the wrong simulation phenomenon can not be caused. The model provided by the invention can be used for quickly and accurately simulating a plurality of substations, so that the development efficiency of a relay protection simulation system can be improved, the system development cost is reduced, the accuracy of simulation can be improved, the quality of simulation training is improved, the matching logic between actual protection can be verified, and the reliability of a relay protection device is ensured.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is an internal schematic diagram of a model;
FIG. 2 is a flow chart of the present invention.
Detailed Description
A modeling method of a relay protection simulation system comprises the following steps during establishment:
step 1, firstly, an equipment model is established, a modeled object is protected equipment, the configuration, principle and characteristics of relay protection are used as protection attributes, the topological attributes and the state attributes of the equipment are packaged by adopting an object-oriented technology, and the attributes and values of the model are shown in table 1.
1. An equipment model is established by taking primary equipment as a main body based on the object-oriented technology, and the table 1 shows.
Table 1 model table of apparatus
And 2, establishing a mapping relation between protection-mutual inductor-circuit breaker.
Step 1) deep search is carried out on the main wiring diagram, devices in the diagram are searched, the types and the number of the devices are determined, meanwhile, the ports of the devices are numbered, the number is a basic number, then connecting lines among the devices in the main wiring diagram are fused, port numbers are fused, a physical port number is obtained, and the position attribute of the determined device model is updated.
And 2) fusing the circuit breaker and the current transformer in the main wiring diagram, fusing the physical port number, obtaining the logical port number, and updating the connection attribute of the equipment model.
And 3) fusing the logic ports to form an electrical island, and updating the electrical attribute of the equipment model.
And 4) performing tidal current analysis on the basis of the electric island, calculating a current direction, port voltage and port current, and updating the direction attribute, the port voltage and the port current of the equipment model.
And step 5) respectively describing models of the transformer, the bus, the line, the cable and the breaker, respectively taking the transformer, the bus, the line, the cable and the breaker as an equipment main body during scanning, respectively scanning according to a strategy of the equipment main body-transformer-breaker, searching topological attributes in the equipment models, and establishing a mapping relation between protection-transformer-breaker according to a connection relation between ports.
And 6) firstly determining the transformers and the breakers corresponding to the equipment during scanning, and then scanning the transformers and the breakers to determine the transformers and the breakers corresponding to each protection.
And 3, searching short-circuit points on the main wiring diagram, determining the physical node numbers of the short-circuit points, comparing the numbers with the position attributes of the equipment model one by one, and determining the positions of the short-circuit points.
Step 4), repeating the step 2) and the step 3) in the step 2), and updating the logic node number and the electric island number in the equipment model;
and 5, short circuit calculation is carried out to obtain the current direction, the port voltage and the port current, and the direction attribute, the port voltage and the port current in the model are updated.
Step 6, scanning the directional properties and electrical islands of all models, it can be determined which devices are involved in the fault,
and 7, respectively executing the action principle models of the equipment from near to far according to the distance from the fault point.
And sequentially executing the action principle of the model, wherein the strategy is as follows:
such as the investment of protection, for example,
the actuation variable is compared to the protection constant,
when the starting variable is larger than the protection fixed value, starting timing;
when the dynamic time is longer than the action time, the circuit breaker corresponding to the protection outlet is disconnected, and the model exits
Starting the variable to be larger than the protection fixed value, resetting the time and exiting the model;
and (5) the protection is not put into the model and the model is withdrawn.
And 8, after the breaker is disconnected, executing the step 3), the step 4) and the step 5) again, and finishing the primary simulation.
Claims (5)
1. A modeling method of a relay protection simulation system is characterized by comprising the following steps:
step 1, establishing an equipment model by taking primary equipment as a main body;
step 2, establishing a mapping relation between equipment, protection, mutual inductor and circuit breaker;
when the mapping relation is established, the method comprises the following steps:
1) the device type, the device number and the port number of the device on the main connection line can be obtained by searching the connection line on the main connection line, the physical port number of the device is obtained by fusing the connection lines, and the position attribute of the model is updated;
2) forming a logic port number through mutual inductor fusion and switch fusion, and updating the connection attribute of the model;
3) fusing the logic ports to form an electrical island and updating the electrical property of the equipment model;
4) carrying out load flow calculation by using the electric island to obtain a current direction, a port voltage and a port current, and updating the state attribute of the model;
5) respectively scanning models of a transformer, a bus, a line, a cable and a breaker, respectively using the transformer, the bus, the line, the cable and the breaker as an equipment main body, scanning the equipment main body one by one according to a strategy of the equipment main body-a mutual inductor-the breaker, and establishing a mapping relation between protection-the mutual inductor-the breaker according to connection attributes of the equipment main body, the mutual inductor and the breaker;
6) updating the protection attribute of the equipment according to the mapping relation of protection-mutual inductor-breaker;
step 3, searching short-circuit points on the main wiring diagram, determining the physical node numbers of the short-circuit points, comparing the numbers with the position attributes of the equipment model one by one, and determining the positions of the short-circuit points;
step 4), repeating the step 2) and the step 3) in the step 2), and updating the logic node number and the electric island number in the equipment model;
step 5, starting short circuit calculation to obtain a current direction, a port voltage and a port current, and updating direction attributes, an electric island, the port voltage, the port current and starting variables in all models;
step 6, searching and comparing the direction attribute and the topology attribute of the equipment to determine which equipment is involved in the short circuit;
step 7, respectively executing the actions in the model according to the distance from the short circuit point to the equipment determined in the step 6;
step 8, after the breaker is disconnected, updating the switching attribute in the breaker model, repeating the step 3), the step 4) and the step 5) in the step 2, and updating topology information, protection information and state information in all equipment models;
at this point, one fault simulation is finished, and if the next fault simulation needs to be performed, the process can be directly started from step 2.
2. The method according to claim 1, wherein in step 1, the modeled object is a protected device, the configuration, principle and characteristics of relay protection are taken as protection attributes, and the topology attributes and state attributes of the device are encapsulated by adopting an object-oriented technology; the equipment model includes: the device comprises a transformer, a bus, a line, a circuit breaker, a current transformer, a voltage transformer, a cable and a reactor.
3. The method according to claim 1, wherein in step 5) of step 2, during scanning, firstly scanning connection attributes of 'equipment body-transformer-breaker', determining which transformers and breakers corresponding to the equipment body are, then scanning the transformers and breakers, and determining transformers and breakers corresponding to each protection according to the position attribute and the direction attribute.
4. The modeling method of the relay protection simulation system according to claim 1, wherein in step 6, the adopted strategy is as follows:
if the models have the same electrical island and directional properties, then the device is within the short circuit range;
and detecting the physical port number of the equipment model in the range, wherein the closer to the port number of the short circuit point, the closer to the short circuit of the equipment is.
5. The modeling method of the relay protection simulation system according to claim 1, wherein in step 7, when the action in the model is executed, the following steps are adopted for protection investment:
checking protection switching in the protection attribute, if the value is protection switching, starting the following process, otherwise jumping out of the process;
the specific process is as follows:
checking the attributes of 'protection constant value', 'starting variable', 'action time', 'action exit' in the protection attribute;
the magnitudes of the actuation variable and the protection constant are compared,
when the starting variable is larger than the protection fixed value, timing is started; when the timing is longer than the action time, the circuit breaker corresponding to the protection outlet is disconnected, the timing is reset, and the flow is jumped out;
and when the starting variable is smaller than the protection fixed value, timing and clearing, and jumping out of the process.
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| JP4827601B2 (en) * | 2006-04-28 | 2011-11-30 | 中国電力株式会社 | Isolated operation detection protection relay device and isolated system state detection method |
| KR100802437B1 (en) * | 2006-12-21 | 2008-02-13 | 주식회사 케이티이엔지 | Refrigeration electronic training kit using programmable logic controller |
| CN103308824B (en) * | 2013-05-31 | 2015-06-03 | 东北大学 | Power system fault diagnostic method based on probability Petri net |
| CN103440803B (en) * | 2013-08-30 | 2016-02-03 | 国家电网公司 | The authentic training system of 10kV power distribution equipment real voltage analog current closed loop |
| CN105510743B (en) * | 2015-12-09 | 2019-06-14 | 交控科技股份有限公司 | Relay IO drive adopts analogy method and system, drives reconnaissance test system |
| CN211375862U (en) * | 2019-12-30 | 2020-08-28 | 郑州万特电气股份有限公司 | Low-voltage intelligent transformer area fault simulation training device |
| CN212516209U (en) * | 2020-07-30 | 2021-02-09 | 北京玖琏科技有限公司 | Relay analog simulation learning platform |
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