CN104104069A - Construction method for multi-agent based micro-grid protection system - Google Patents
Construction method for multi-agent based micro-grid protection system Download PDFInfo
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- CN104104069A CN104104069A CN201410356984.7A CN201410356984A CN104104069A CN 104104069 A CN104104069 A CN 104104069A CN 201410356984 A CN201410356984 A CN 201410356984A CN 104104069 A CN104104069 A CN 104104069A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The invention relates to a construction method for a multi-agent based micro-grid protection system. The multi-agent based micro-grid protection system which is constructed under an integrated system structure framework is divided into a device layer, an execution layer, a decision layer and a communication layer according to functions and layers. The device layer which is a system structure base layer faces a terminal device; the execution layer which is a connection step of the system structure undertakes information acquisition and command communication of a decision center and various device terminals; the decision layer which is a core step of the system structure achieves information integration and protects comprehensive decision; the communication layer which is an information circulation and transmission step is the basis for multi-agent implement and passes through the integral system structure; side current variable quantity based multi-agent micro-grid main and spare protective calculation decision methods are put forward. The construction method for the multi-agent based micro-grid protection system has the advantages of overcoming disadvantages of a traditional single-point information and two-point information based protective system, fully developing huge potential of the micro-grid main body communication structure in saving invest and providing possibility for future integration of multiple systems and protective relaying in future micro-grid.
Description
Technical field
The present invention relates to a kind of microgrid protection system, particularly a kind of construction method of the microgrid protection system based on many agencies.
Background technology
Multi-agent technology is the cross discipline of artificial intelligence and computer technology, there is capacity of self-government, social ability, adaptability to changes and spontaneous behaviour, at aspects such as manufacturing industry, process control, telecommunication system, traffic administration, tele-medicines, obtained universal and application.Be accompanied by that electric network composition is complicated, electricity needs customizes, the intensification of terminal equipment Intellectualized Tendency, multi-agent technology rapid permeability, to electric power system every field, has obtained many application practices at aspects such as electricity market, energy management, voltage power-less control, trend calculating.In recent years, for strengthening reliability and the serious forgiveness of relaying protection, reduce the operate time of backup protection, this technology also starts to obtain in-depth application in links such as relay protection of power system, failure diagnosis, fault subregion and rack reconstruct.
Multi-agent technology is as senior application and the specific implementation of artificial intelligence, in the identification processing of global information and United Dispatching operation management, has huge comparative advantages.This technology is applied to microgrid protection; in the deficiency overcoming based on single-point information and two dot information traditional protections; give full play to microgrid main body communication construction, there are huge potentiality the aspect of reducing investment outlay, also for the fusion of multisystem and relaying protection in following microgrid provides may.Along with the innovation of theory and the development of technology, this method has possessed good feasibility and operability.
The one, sensor technology, Clock Synchronization Technology, Fibre Optical Communication Technology etc. reach its maturity, and have connected from data acquisition top to the whole information interaction overall process of data analysis terminal, have solved the problem of information flow in multi-agent technology application.
The 2nd, the develop rapidly of computer technology, data synchronization technology; comprise the application of the means such as parallel computation, cloud computing, large data analysis; become the application technology that multiterminal Microcomputer Protection is new and support, can greatly reduce the Analysis on Fault Diagnosis time, effectively for the requirement of protection quick-action.
The 3rd, the existing measurement of microgrid, monitoring, energy management and dispatching management information system provide comparatively complete information flow platform for multi-agent technology.The protection of microgrid based on many agencies only need increase terminal integrated decision-making system on original existing communication network basis, and realizes information interaction with other, the investment of reduction technology application and realize difficulty.Each system configuration signal of microgrid as shown in Figure 1.
Summary of the invention
The present invention be directed to multi-agent technology and be applied to the problem that microgrid protection has huge advantage; a kind of construction method of the microgrid protection system based on many agencies has been proposed; to act on behalf of (agency) technology and wide area protection theory combines more, provided microgrid protection structural framing and the implementation method based on many agencies of system.
Technical scheme of the present invention is: a kind of construction method of the microgrid protection system based on many agencies, and apparatus for establishing layer, execution level, decision-making level, also comprise information flow transmission link communication layers from top to bottom;
Mechanical floor comprises a plurality of proxy for equipment, covers primary equipment in microgrid, and primary equipment comprises source, load, bus, circuit breaker and the circuit of declining that distribute, and take circuit breaker as separation, using each section of equipment as an independent agency;
Execution level comprises the data collection agent of uploading link and the agents of assigning link, is all encapsulated in intelligent terminal;
Decision-making level comprises protection calculation agency, outside context aware agency, integrated decision-making agency, condition monitoring agency;
The data collection agent collecting device layer state data of execution level are sent protection calculation agency and the condition monitoring agency of decision-making level; the protection calculation agency of decision-making level carries out sending integrated decision-making agency after failure diagnosis and fault location; outside context aware agency is by the voltage constraint of outer net, frequency constraint, the constraint of interconnection transmission capacity; integrated decision-making agency is sent in energy management and synthesis scheduling system order constraint; integrated decision-making has been acted on behalf of information and has been integrated and protected after integrated decision-making; send instruction and send to mechanical floor through execution level, realize the action of mechanical floor components and parts.
Described protection calculation agency regards the circuit breaker of battery limits as limit, equipment component between two circuit breakers is regarded node as, form directional topology, using again flow through each circuit breaker curent change as judgement protection foundation, when in microgrid, electric current is greater than setting value arbitrarily, starting protection criterion, carry out failure diagnosis and fault location, integrated decision-making agency receives behind fault zone, protection calculation agency location, to the circuit breaker being connected with this region, send trip signal, protection calculation agency receives data collection agent data again, judgement protection correct operation, as find that there is circuit breaker tripping, by failure diagnosis, send integrated decision-making agency, integrated decision-making agency sends trip signal to the circuit breaker in the region that is connected with this circuit breaker.
Beneficial effect of the present invention is: the construction method that the present invention is based on many agencies' microgrid protection system; in the deficiency overcoming based on single-point information and two dot information traditional protections; give full play to microgrid main body communication construction, there are huge potentiality the aspect of reducing investment outlay, also for the fusion of multisystem and relaying protection in following microgrid provides may.
Accompanying drawing explanation
Fig. 1 is each system configuration schematic diagram of microgrid;
Fig. 2 is that the present invention acts on behalf of microgrid protective system structure figure more;
Fig. 3 is microgrid directional topology conversion schematic diagram of the present invention;
Fig. 4 is protection calculation decision flow diagram of the present invention;
Fig. 5 is that overcurrent startup agency of the present invention sends overcurrent signal figure;
Fig. 6 is limit of the present invention fault message oscillogram;
Fig. 7 is fault zone of the present invention network for location;
Fig. 8 is main protection circuit breaker movement oscillogram of the present invention;
Fig. 9 is Line1 current waveform figure before and after main protection fault of the present invention;
Figure 10 is backup protection breaker movement oscillogram of the present invention;
Figure 11 is Line1 current waveform figure before and after backup protection fault of the present invention.
Embodiment
The present invention has chosen integrated system structure; set up and acted on behalf of microgrid protective system structure containing mechanical floor, execution level, decision-making level and communication layers more; and in conjunction with graph theory thought, proposed based on limit current change quantity act on behalf of the active and standby protection calculation decision-making technique of microgrid more, specific as follows:
1, act on behalf of the architectural framework of microgrid protection more
The present invention acts on behalf of microgrid protection system according to the feature of object of protection and Demand Design more, is based upon under integrated system structural framing, by function and level, can be divided into mechanical floor, execution level, decision-making level and communication layers.Mechanical floor is architectural framework bottom, terminaloriented equipment; Execution level is the link of accepting of architectural framework, bears acquisition of information and the pass down the line of decision center and each device end; Decision-making level is the core link of architectural framework, and the information that completes is integrated and protection integrated decision-making; Communication layers is information flow transmission link, is the basis that many agencies implement, and implements whole architectural framework.Integral system framework is the microgrid protective system structure figure that act on behalf of as shown in Figure 2 more:
(1) mechanical floor
In mechanical floor, contain a plurality of proxy for equipment, covered in microgrid the primary equipments such as source, load, bus, circuit breaker and circuit that decline that distribute, take circuit breaker as separation, using each section of equipment as an independent agency.
(2) execution level
Execution level comprises the data collection agent of uploading link and the agents of assigning link, is all encapsulated in intelligent terminal.Data collection agent according to demand, be responsible for gathering voltage, electric current, phase angle, the meritorious and idle situation of each proxy for equipment, and transmit (communication network and communication modes be not as this research emphasis) by NS2 Emulated LAN or Wide Area Communication network.
(3) decision-making level
In decision-making level, pass through the disparate modules such as condition monitoring, protection calculation judgement, outside context aware; integrated decision-making; the function such as realize that failure diagnosis, fault location, grid structure restructuring, real-time model are adjusted, and instruction is issued to agents, control the action of relevant components and parts.
1) context aware agency
Context aware agency is main considers that the constraint of outer net voltage, outer net frequency constraint, interconnection transmission capacity retrain, energy management and synthesis scheduling system order constraint, and its constraints is as shown in Equation (1)
（1）
2) protection calculation agency
Protection calculation agency is the key that can protection calculation be realized, and many scholars have proposed different protection strategies to this, comprise the application of wide area differential protection, the real-time adjustment of the information of adjusting etc.This uses for reference the thought of graph theory; regard circuit breaker agency as limit; equipment component between two circuit breakers is regarded node as; form directional topology (wherein positive direction can be stipulated voluntarily); using limit electric current (flowing through the electric current of each circuit breaker) variable quantity as protection criterion (seeing formula 2) again; when in microgrid, electric current is greater than setting value arbitrarily, starting protection criterion, carries out failure diagnosis and fault location.
It is reference that IEEE1547.4 typical case microgrid model is take in the present invention; set up research object; and carry out directional topology conversion; microgrid directional topology converts schematic diagram as shown in Figure 3; the directed edge that wherein e forms for each circuit breaker; Z is that circuit breaker is cut-point, the protection zone that the equipment component that two circuit breakers are shown in forms:
Region
failure diagnosis criterion is:
（2）
And if only if
it within=1 o'clock, is region
fault, and carry out corresponding protection action.
In above formula:
m ij for the oriented structure matrix value of microgrid, with node (Z in Fig. 3)
ifor row vector, with branch road (e in Fig. 3)
jfor column vector.
，
b fj for limit fault message, its value is shown in Table 1 limit fault current information value table.
Table 1
According to limit current change quantity, consider the protection calculation decision process of master, backup protection as shown in Figure 4.
2, example
The present invention be take Fig. 3 microgrid as object, by many agent protections of MTALAB simulating, verifying feasibility.In Fig. 3, microgrid parameter is shown in Table 2.
Table 2
Note: cable model is YJLV
22-150/60(R=0.259 Ω/km, X=0.093 Ω/km)
While take 0.1s, each line steady-state electric current of microgrid is benchmark, and overcurrent starts module and adjusts by 1.5 times.If protection zone Z during 0.3s
7there is a phase metallic earthing fault.
(1) main protection action situation analysis
After fault occurs; overcurrent starts agency and sends overcurrent signal (overcurrent enabling signal figure as shown in Figure 5); start immediately edge direction variable quantity protection calculation agency, relatively limit current phase, the amplitude before and after fault, calculates limit fault message vector B according to table 1
f(a phase fault information on limit is limit fault message oscillogram as shown in Figure 6), then by formula (2), calculated the Reflector F of each node
i , protection zone Z wherein
7reflector fault zone network for location as shown in Figure 7, waveform shows that location, fault zone is correct.
Behind fault zone, integrated decision-making agency location, to the circuit breaker agency who is connected with this region, send trip signal, in this example, i.e. circuit breaker B1, B2, B3, B7, B8.Circuit breaker action situation is circuit breaker movement oscillogram as shown in Figure 8, and 1 represents closure, and 0 representative disconnects.
Take circuit Line1 as example, and before and after fault, as shown in Figure 9, result shows to protect correct operation to current waveform, successful isolated fault.
(2) backup protection action situation analysis
Main protection is sent after trip signal, if certain circuit breaker tripping, fault is not isolated, and time delay 0.2s starts backup protection.If protection zone Z
7occur after a phase metallic earthing fault, circuit breaker B1, B2, B3, B7 correct operation, B8 tripping, backup protection is connected time delay excision and the circuit breaker (being B10, B11, B12, B13) of closure still with B8, with isolated fault.(numbering of circuit breaker B1～B24 is corresponding one by one with limit e1～e24 in Fig. 3)
Backup protection breaker movement oscillogram as shown in figure 10, Line1 current waveform figure before and after backup protection fault as shown in figure 11.
Claims (2)
1. a construction method for the microgrid protection system based on many agencies, is characterized in that, apparatus for establishing layer, execution level, decision-making level, also comprise information flow transmission link communication layers from top to bottom;
Mechanical floor comprises a plurality of proxy for equipment, covers primary equipment in microgrid, and primary equipment comprises source, load, bus, circuit breaker and the circuit of declining that distribute, and take circuit breaker as separation, using each section of equipment as an independent agency;
Execution level comprises the data collection agent of uploading link and the agents of assigning link, is all encapsulated in intelligent terminal;
Decision-making level comprises protection calculation agency, outside context aware agency, integrated decision-making agency, condition monitoring agency;
The data collection agent collecting device layer state data of execution level are sent protection calculation agency and the condition monitoring agency of decision-making level; the protection calculation agency of decision-making level carries out sending integrated decision-making agency after failure diagnosis and fault location; outside context aware agency is by the voltage constraint of outer net, frequency constraint, the constraint of interconnection transmission capacity; integrated decision-making agency is sent in energy management and synthesis scheduling system order constraint; integrated decision-making has been acted on behalf of information and has been integrated and protected after integrated decision-making; send instruction and send to mechanical floor through execution level, realize the action of mechanical floor components and parts.
2. according to the construction method of the microgrid protection system based on many agencies shown in claim 1, it is characterized in that, described protection calculation agency regards the circuit breaker of battery limits as limit, equipment component between two circuit breakers is regarded node as, form directional topology, using again flow through each circuit breaker curent change as judgement protection foundation, when in microgrid, electric current is greater than setting value arbitrarily, starting protection criterion, carry out failure diagnosis and fault location, integrated decision-making agency receives behind fault zone, protection calculation agency location, to the circuit breaker being connected with this region, send trip signal, protection calculation agency receives data collection agent data again, judgement protection correct operation, as find that there is circuit breaker tripping, by failure diagnosis, send integrated decision-making agency, integrated decision-making agency sends trip signal to the circuit breaker in the region that is connected with this circuit breaker.
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| CN104505864A (en) * | 2014-12-12 | 2015-04-08 | 国家电网公司 | Demand response control strategy simulation system and method for absorptive distributed type power generation |
| CN104578007A (en) * | 2015-01-04 | 2015-04-29 | 江苏省电力公司盱眙县供电公司 | Centralized relay protection device |
| CN104701827A (en) * | 2015-03-17 | 2015-06-10 | 东北大学 | Microgrid wide-area current protecting system and method based on multi-Agent technology |
| CN105356432A (en) * | 2015-11-30 | 2016-02-24 | 江苏省电力公司盐城供电公司 | Multi-linked distribution network fault power-losing area topology identification system and method based on Multi-Agent |
| CN107221918A (en) * | 2017-06-26 | 2017-09-29 | 余杨 | Exchange microgrid protection faulty action preventing method based on edge direction variable quantity |
| CN107994602A (en) * | 2017-10-12 | 2018-05-04 | 安徽华腾电气有限公司 | Shifty photovoltaic micro guard method and its system |
| US11835568B2 (en) | 2020-11-18 | 2023-12-05 | General Electric Company | Systems and methods for monitoring and diagnosing power system assets |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505864A (en) * | 2014-12-12 | 2015-04-08 | 国家电网公司 | Demand response control strategy simulation system and method for absorptive distributed type power generation |
| CN104578007A (en) * | 2015-01-04 | 2015-04-29 | 江苏省电力公司盱眙县供电公司 | Centralized relay protection device |
| CN104701827A (en) * | 2015-03-17 | 2015-06-10 | 东北大学 | Microgrid wide-area current protecting system and method based on multi-Agent technology |
| CN104701827B (en) * | 2015-03-17 | 2017-06-20 | 东北大学 | Microgrid wide area current protection system and method based on multi-Agent technology |
| CN105356432A (en) * | 2015-11-30 | 2016-02-24 | 江苏省电力公司盐城供电公司 | Multi-linked distribution network fault power-losing area topology identification system and method based on Multi-Agent |
| CN105356432B (en) * | 2015-11-30 | 2018-04-06 | 江苏省电力公司盐城供电公司 | More contact distribution network failure dead electricity region topology identifying systems and method based on Multi Agent |
| CN107221918A (en) * | 2017-06-26 | 2017-09-29 | 余杨 | Exchange microgrid protection faulty action preventing method based on edge direction variable quantity |
| CN107994602A (en) * | 2017-10-12 | 2018-05-04 | 安徽华腾电气有限公司 | Shifty photovoltaic micro guard method and its system |
| CN107994602B (en) * | 2017-10-12 | 2021-01-08 | 安徽康爱而电气有限公司 | Multi-strategy photovoltaic micro-grid protection method and system |
| US11835568B2 (en) | 2020-11-18 | 2023-12-05 | General Electric Company | Systems and methods for monitoring and diagnosing power system assets |
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Application publication date: 20141015 |