CN104901328A - Multi-terminal flexible DC control mode automatic identification method based on complex control network - Google Patents
Multi-terminal flexible DC control mode automatic identification method based on complex control network Download PDFInfo
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- CN104901328A CN104901328A CN201510262519.1A CN201510262519A CN104901328A CN 104901328 A CN104901328 A CN 104901328A CN 201510262519 A CN201510262519 A CN 201510262519A CN 104901328 A CN104901328 A CN 104901328A
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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
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- 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
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention provides a multi-terminal flexible DC control mode automatic identification method based on a complex control network. A multi-terminal flexible DC system network topology model is constructed based on an object oriented technology according to power grid multipoint and multidimensional information provided by a PMU, and topology tracking is performed on the whole network or local by adopting an advanced fast indexing topology tracking method and the theory of statistical analysis. When the branch state of a multi-terminal flexible DC system changes, similarity difference between electrical quantities of the switching state, node voltage and current of each branch in the system is analyzed by the method so that change of the network state is rapidly tracked and identified and the operation mode of the multi-terminal flexible DC system is adjusted. Meanwhile, power grid topology structure parameter information is provided to the multi-terminal flexible DC system, and load flow calculation and fault analysis are performed by a converter station control system according to the parameter information so that basic data are provided to steady state control of a converter station.
Description
Technical field
The invention belongs to direct current transportation control technology field, be specifically related to a kind of based on the soft straight control model automatic identification technology under complex control network (i.e. the soft straight main electrical scheme network of multiterminal), this technology can according to the operational mode of the soft direct line system of direct current system network topology structure determination multiterminal, and can to the change of quick recognition network state, the operational mode of the soft direct line system of adjustment automatically.Improve economy and the stability of soft straight system cloud gray model.
Background technology
Flexible DC power transmission has independent control active power and reactive power, and DC voltage polarity can be kept constant when trend is reversed, the feature of direct current direction reversion.Soft straight current conversion station is equivalent to current source for DC side, is extremely conducive to forming multi-terminal direct current transmission system in parallel.Due to the Volume control of soft direct line system, determining the soft direct line system of multiterminal can have multiple operational mode.MTDC transmission system operational mode is relevant with the control mode of power transmission direction and direct current system, also has very important relation with the direct current system mode of connection simultaneously.When the direct current system mode of connection changes, if adjust the operational mode of soft direct line system not in time, will impact the stable operation of soft direct line system.So Multi-end flexible direct current transmission system according to grid topological relation, can select rational operational mode, most important to the stable operation of Multi-end flexible direct current transmission system.
Comprehensive foregoing, the present invention proposes a kind of based on the soft straight control model automatic identification technology of the multiterminal under complex control network, this technology can according to the on off state of AC system and direct current system, carry out soft straight Network Topology Analysis, in real time the effective running status change following the tracks of and identify electrical network.The stable state of uniting for soft direct line calculates, direction of tide differentiates, operational mode judges and accident analysis etc. provides topological structure of electric parameter information.Multiterminal flexible direct current control system, according to this parameter information, determines the operational mode of Multi-end flexible direct current transmission system, coordinates each current conversion station of soft straight internal system and runs, meet soft straight transmission system control overflow.
Summary of the invention
For solving the above problem existed in prior art, the invention discloses a kind of Multi-end flexible direct current transmission system level cooperative control device.Realize the cooperation control of Multi-end flexible direct current transmission system.
The present invention is concrete by the following technical solutions:
A kind of based on the soft straight control model automatic identifying method of the multiterminal under complex control network, it is characterized in that: described method is according to the operational mode of the soft direct line system of direct current system network topology structure determination multiterminal, the change of quick identification direct current system network state, the operational mode of the soft direct line system of automatic adjustment, ensures the stable operation of the soft direct line system of multiterminal.
Based on the soft straight control model automatic identifying method of the multiterminal under complex control network, it is characterized in that, described recognition methods comprises the following steps:
Step 1: the multiple spot various dimensions information being gathered Multi-end flexible direct current transmission system network by phasor measurement unit PMU, comprises circuit breaker, disconnecting link, transformer, converter, bus and line state information and Multi-end flexible direct current transmission system network operational parameter; Wherein, multiple spot refers to multiple data acquisition node in system, is state point and the route survey point of all devices.Dimension according to system configuration definition, in direct current system network different levels and region equipment can be divided into different dimensional extent.
Step 2: will have the equipment of same operation characteristic based on Object-oriented Technique, is divided in same equipment group; Be multinode by multimode device map, the parent object device object for this reason of each node, by abstract for the equipment connection in Multi-end flexible direct current transmission system network be stube cable node and annexation, the electric attribute of often kind of equipment is all abstract is nodal community and annexation attribute, be built into current conversion station model by device model, then form Multi-end flexible direct current transmission system network topology model by current conversion station model;
Step 3: the Multi-end flexible direct current transmission system network topology model generated according to step 2, adopts breadth first search to travel through described network topology model, completes identification and the network partition of branch type simultaneously; By quick indexing topology tracking, real-time tracking is carried out to Multi-end flexible direct current transmission system network state (network state refers to the topological structure of multi-terminal system), change the operational mode of Multi-end flexible direct current transmission system according to the change of direct current system topology of networks.
Describedly can provide topological structure of electric parameter information for the soft straight control system of multiterminal based on the soft straight control model automatic identifying method of the multiterminal under complex control network.Multiterminal flexible direct current control system, according to this parameter information, carries out Load flow calculation and accident analysis, and the stable state for current conversion station controls to provide basic data.
Described based on the soft straight control model automatic identifying method employing quick indexing topology tracking of the multiterminal under complex control network, while direct line system initial network structure soft to multiterminal carries out static traversal, the judgement and the network configuration that complete each current conversion station method of operation divide.When multiterminal soft direct line system branch of a network state changes, the method adopts quick indexing search rule to upgrade network topology, and generates the operational mode of the soft direct line system of multiterminal according to new topological structure.
Accompanying drawing explanation
Fig. 1 is the soft straight system converter station models of multiterminal;
Fig. 2 is the soft straight system converter station topological models of multiterminal;
Fig. 3 is based on the schematic flow sheet of the soft straight control model automatic identifying method of the multiterminal under complex control network.
Embodiment
Below in conjunction with explanation accompanying drawing, technical scheme of the present invention is described in further detail.
Be illustrated in figure 1 multiterminal flexiblesystem current conversion station model.The soft straight control model automatic identification technology of multiterminal becomes one group of cluster tool be made up of some connecting lines be mutually related between equipment and equipment the equivalence of current conversion station model, comprises circuit breaker, disconnecting link, transformer, converter, bus and circuit etc.With reference to IEC61970 standard, provide current conversion station model.According to the set that current conversion station model is one group of interrelated equipment, when dividing current conversion station, each current conversion station being mutually related classification of equipment to together, the characteristic of equipment will being considered simultaneously, will there is the equipment of identical device characteristic, being divided in same equipment group.Be multinode by multimode device map, the parent object device object for this reason of each node, by abstract for equipment connection be stube cable node and annexation, the electric attribute of often kind of equipment is all abstract is the attribute of node and relation.Consider the complicated process of analytic process, the equipment in each current conversion station can not be too much, otherwise the state that may exist can be caused too much.After current conversion station model is set up, then form Multi-end flexible direct current transmission system zone network model by current conversion station model, and after the topology information of network is put in storage, the base reference data of inquiring about as multiterminal flexible direct current system operational mode, analyzing and judging.
Be illustrated in figure 2 multiterminal flexiblesystem current conversion station topological model.All for soft for multiterminal direct line each end points crossing current conversion station model are interconnected by the soft straight control model automatic identification technology of multiterminal becomes connected node, form topological node by topological analysis, topological node is interconnected current conversion station to receive by circuit and forms topological island together.First be the Topology Analysis Based of the soft direct line system of multiterminal, its function is that the DC line analyzing the soft direct line system of end connects into how many topological nodes by close circuit breaker, the result of multiterminal soft direct line system Topology Analysis Based is that each current conversion station is divided into several topological nodes, also can be called node analysis.Analyze the connected node of current conversion station, these end points are divided into the branch road of connection.Next is the soft straight Network Topology Analysis of multiterminal, and task is that the topological node analyzing whole system connects into how many topological island by branch road.Analysis result to have the topological node of electrical link to be divided in a topological island, by analyzing the connection status of current conversion station in how topological island, and and the current conversion station running status of preserving in current conversion station model analysis compares, thus obtain the legal operational mode of current conversion station.A complicated catenet is decomposed into current conversion station one by one by the method, each current conversion station is analyzed, then these current conversion stations are passed through specific linkage unit < circuit) link together, thus complete the analysis of whole complex network, the operational mode of the soft direct line system of multiterminal can be determined by topological analysis fast and accurately, guarantee that soft direct line system safely and steadily runs.
Be illustrated in figure 3 the schematic flow sheet based on the soft straight control model automatic identifying method of the multiterminal under complex control network, disclosed by the inventionly comprise the following steps based on the soft straight control model automatic identifying method of the multiterminal under complex control network:
Step 1: first algorithm for pattern recognition is analyzed all equipment states in current conversion station simulation, adopt BFS method, search inquiry is carried out to all devices in Multi-end flexible direct current transmission system network, set up the electric attribute annexation of all devices object, and complete identification and the network partition of branch type.Generate original current conversion station model and Multi-end flexible direct current transmission system network model.Determine the control model that in Multi-end flexible direct current transmission system, each current conversion station is initial.
Step 2: according to the analysis of various equipment fault on soft straight system operation mode impact, in conjunction with network topology matrix, obtain various fault on the impact of system and needed for the operational mode operation carried out, carry out parameter information storage, for subsequent analysis inquiry and reference.
Step 3: algorithm for pattern recognition timing detects the change of Multi-end flexible direct current transmission system interior nodes state, after detecting that Multi-end flexible direct current transmission system interior nodes state changes, according to the change of network configuration, compare with the storage information generated in step 2, select the parameter information satisfied condition to generate new operational mode, and upgrade current conversion station model and Multi-end flexible direct current transmission system network model.
Utilize the bi-directional association relation of node class and branch road class herein, based on breadth first search, initial network topology is traveled through, and achieve identification and the network partition of branch type simultaneously.According to the analysis of various equipment fault on soft straight system operation mode impact, in conjunction with network topology matrix, obtain various fault on the impact of system and needed for the operational mode operation carried out, carry out parameter information and store for subsequent analysis inquiry and reference.Pattern recognition carries out fast search tracking by quick indexing topology tracking to the equipment state in soft straight grid, adopt and means that are abstract and that simplify are carried out to network, in conjunction with network failure situation, the topology achieving network is followed the tracks of, the impact of the soft straight system operation mode of multistage is judged because network configuration changes after equipment fault, in time the soft straight current conversion station control model of adjustment.The method can be applicable to the soft straight distribution network of independence of any labyrinth, can meet the needs of multiterminal soft direct line system operational management, has good theory significance and practical value for the operation level improving the soft direct line system of multiterminal.
Claims (1)
1., based on the soft straight control model automatic identifying method of the multiterminal under complex control network, it is characterized in that, described recognition methods comprises the following steps:
Step 1: the multiple spot various dimensions information being gathered Multi-end flexible direct current transmission system network by phasor measurement unit PMU, comprises circuit breaker, disconnecting link, transformer, converter, bus and line state information and Multi-end flexible direct current transmission system network operational parameter;
Step 2: will there is the classification of equipment of same operation characteristic in same equipment group based on Object-oriented Technique; Be multinode by multimode device map, the parent object device object for this reason of each node, by abstract for the equipment connection in Multi-end flexible direct current transmission system network be stube cable node and annexation, the electric attribute of often kind of equipment is all abstract is nodal community and annexation attribute, be built into current conversion station model by device model, then form Multi-end flexible direct current transmission system network topology model by current conversion station model;
Step 3: the Multi-end flexible direct current transmission system network topology model generated according to step 2, adopts breadth first search to travel through described network topology model, completes identification and the network partition of branch type simultaneously; Carry out real-time tracking by the topological structure of quick indexing topology tracking to Multi-end flexible direct current transmission system network state and Multi-end flexible direct current transmission system, change the operational mode of Multi-end flexible direct current transmission system according to the change of the topological structure of Multi-end flexible direct current transmission system.
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Cited By (5)
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| CN106651645A (en) * | 2016-11-22 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Fault data management method for direct-current transmission system |
| CN108563129A (en) * | 2018-05-30 | 2018-09-21 | 江苏师范大学 | The method for fast establishing of high-speed railway CPIII vertical control network conditional equations |
| CN112152251A (en) * | 2020-09-29 | 2020-12-29 | 华北电力科学研究院有限责任公司 | Automatic detection method and device for operation mode of flexible direct current power distribution network system |
| CN113765132A (en) * | 2021-08-27 | 2021-12-07 | 南方电网科学研究院有限责任公司 | Multi-terminal direct-current power transmission system topology selection method, system, equipment and medium |
| CN113765132B (en) * | 2021-08-27 | 2024-04-16 | 南方电网科学研究院有限责任公司 | Multi-terminal direct current transmission system topology selection method, system, equipment and medium |
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| JP2003052126A (en) * | 2001-05-21 | 2003-02-21 | Abb Res Ltd | Stability prediction of power network |
| CN1851693A (en) * | 2005-09-07 | 2006-10-25 | 华为技术有限公司 | Method for realizing system resources management |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106651645A (en) * | 2016-11-22 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Fault data management method for direct-current transmission system |
| CN108563129A (en) * | 2018-05-30 | 2018-09-21 | 江苏师范大学 | The method for fast establishing of high-speed railway CPIII vertical control network conditional equations |
| CN112152251A (en) * | 2020-09-29 | 2020-12-29 | 华北电力科学研究院有限责任公司 | Automatic detection method and device for operation mode of flexible direct current power distribution network system |
| CN113765132A (en) * | 2021-08-27 | 2021-12-07 | 南方电网科学研究院有限责任公司 | Multi-terminal direct-current power transmission system topology selection method, system, equipment and medium |
| CN113765132B (en) * | 2021-08-27 | 2024-04-16 | 南方电网科学研究院有限责任公司 | Multi-terminal direct current transmission system topology selection method, system, equipment and medium |
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