Co-architecture, device and the Synergistic method of the power distribution protection of the device containing flexible interconnectionTechnical field
The present invention relates to co-architecture, device and the Synergistic method of a kind of power distribution protection of device containing flexible interconnection, belong toPower System and its Automation technical field.
Background technology
Achievement in research in recent years shows that the alternating current-direct current mixing power distribution network based on flexible direct current technology is more suitable for modern cityThe development of power distribution network.Alternating current-direct current mixing power distribution network can preferably receive distributed power source and DC load, can alleviate urban distribution networkWebsite corridor is limited with the high contradiction of load density, is supported while providing dynamic reactive in load center, can improve system safetyMaintenance level simultaneously reduces loss.Therefore, alternating current-direct current mixing power distribution network is an important development trend of power distribution network, can effectively be carriedRise the quality of power supply, reliability and the operational efficiency of city electric distribution system.At present, the event of power distribution network is accessed for flexible interconnection deviceHinder feature and protection and control technology, lay particular emphasis on DC side protection, including protection of direct current supply line, current conversion station internal unit is protectedThe research such as shield.
During Utilities Electric Co. both domestic and external builds during the engineering of pressure alternating current-direct current power distribution network, mainly for AC system distribution fromThe research and construction of dynamicization, distribution terminal, but the protection that the ac and dc systemses feature accessed for flexible interconnection device is formulatedImplementation method is related to less.If using traditional distributing protection supervisory equipment, what each protection supervisory equipment can be obtainedSystem information is limited, it is impossible to coordinates with flexible interconnection device and makes quick judgement, also just can not be to the former of whole ac and dc systemsesBarrier, which is made, quickly and accurately to be judged.There is R＆D institution to propose using centralized decision-making pattern, increase in Ac/dc Power SystemsMaster controller is protected, by protecting master controller to gather the protection act information of full ac and dc systemses, including flexible interconnection deviceAction message, system-wide wide area protection is realized with this, fault location and isolation is realized；But this forms of protection will to communicationAsk very high, protection master controller requirement obtains the protection supervisory equipment status information of whole station, collection signal speed is slow, logic judgmentComplexity, judgement will also send outlet order to related protection supervisory equipment after being out of order, speed is slow, and security can not be obtainedMeet well.
The content of the invention
To solve the deficiencies in the prior art, protected on the spot it is an object of the invention to provide a kind of flexible interconnection device with exchangingCo-architecture, device and the Synergistic method of control device are protected, relative to the relaying configuration mode of conventional electrical distribution system, with fasterTroubleshooting speed and preferably collaboration troubleshooting capability so that with very high application value.
In order to realize above-mentioned target, the present invention is adopted the following technical scheme that：
A kind of co-architecture of the power distribution protection of the device containing flexible interconnection, it is characterized in that, including in flexible interconnection deviceTwo ends MMC current changer modules status information interaction and Collaborative Control, flexible interconnection device both sides fault in ac transmission system status informationInteraction and Collaborative Control, the information exchange and Collaborative Control of MMC current changer modules and AC protection for feed line control device.
A kind of power distribution protective device of the device containing flexible interconnection, it is characterized in that, including breaker and the breaker are one by oneCorresponding protection supervisory equipment, flexible interconnection device and interchanger；The interchanger is used to be connected with intelligent apparatus.
Further, every intelligent apparatus includes two network interfaces, and A network interfaces and B network interfaces, wherein A network interfaces are designated as respectivelyConnect interchanger, be connected with monitoring, B network interfaces connect the B network interfaces of adjacent intelligent apparatus, realize that network is shaken hands.
Further, between the intelligent apparatus use 61850 communication standards, by GOOSE mechanism realize each unit itBetween high speed data exchange and mutual locking.
Further, region is determined as unit using two neighboring or more than three breakers, network tip portion is with endThe downstream area that tip feeder breaker is split is unit, and whole alternating current-direct current mixing power distribution network is divided into some Minimum Areas,One intelligent apparatus associated region is used as using each Minimum Area；Intelligent apparatus in one protection device associated region is setFor one group, signal is transmitted using multicast and broadcast mode between monitoring, and it is highest preferentially transmission etc. to set remote signalling to conjugate signalLevel；The monitoring docking collection of letters number carries out a logic judgment, tracing trouble and an isolated fault region.
A kind of Synergistic method of the power distribution protection co-architecture of the device containing flexible interconnection, it is characterized in that,
When occurring metallicity three-phase fault in flexible direct current interconnect device exchange exit, the MMC modules locking of failure side is simultaneouslyRegion communication network is transmitted, communication area intelligent apparatus receives the quick sensing signal of flexible interconnection device, realize quick eventPhragma from；
When straight-flow system breaks down, the MMC modules locking of flexible interconnection device both sides is simultaneously transmitted to region communication network；The rapid locking direct current region of power electronic equipment, it is ensured that communication area failure is not passed through；Meanwhile, the intelligent protection measuring of communication areaControl breakdown judge and isolation features that device is furnished with intelligent distributed FA, the area being not connected with AC system and soft straight deviceDomain, the safety and stability of communication area is ensured using distributed FA criterion；
AC protection for feed line control device receives whole district's signal, and Quick fault section is simultaneously acted.
The beneficial effect that the present invention is reached：Make full use of the power electronic devices fast state of flexible direct current interconnect deviceThe characteristics of perception, by setting up fast messaging network, the snap information interaction of all intelligent apparatus in ac and dc systemses is realized,In the case of without central control system, before single exchange side outlet protection detects trouble point, position fast accurateRegion, recovers non-faulting block supply to greatest extent；With processing speed is fast, cost is low, independent of the excellent of single control unitPoint；Compared to the cooperation only considered between AC protection device, this method combination alternating current-direct current mixes the fault characteristic of distribution system,Using IGBT fast response characteristic, by the foundation of GOOSE high-speed communication networks, failure detection time reduces more than half,Effectively strengthen the alternating current-direct current mixing distribution network reliability of the device containing flexible interconnection, shorten power off time.
Brief description of the drawings
Fig. 1 is the schematic diagram of Collaborative Control framework of the present invention；
Fig. 2 is the schematic diagram of cooperative control method of the present invention.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present inventionTechnical scheme, and can not be limited the scope of the invention with this.
When the technical solution adopted by the present invention is broadly divided into structure flexible interconnection device and power distribution protection control device and is based onThe Collaborative Control framework that sequence coordinates, support is realized based on the quick treatment in situ of AC failure, flexible direct current plant failure differentiatesSupplemented by coordination control strategy, while ensureing that flexible interconnection device and AC protection for feed line control to fill in Ac/dc Power SystemsThe two ends MMC current changer modules status information put in the Collaborative Control based on time cooperation, flexible interconnection device is interacted with cooperateing withControl, the interaction of flexible interconnection device both sides fault in ac transmission system status information and Collaborative Control, MMC modules are protected with AC feeder lineProtect the contents such as the information exchange and Collaborative Control of control device.
Wherein, the flexible interconnection device based on time cooperation and power distribution protection control device Collaborative Control framework applications to dressIn putting, the device as described in power 2 is formed：
As shown in figure 1, employ distribution flexible interconnection device with time cooperation control function exchanges feeder line with newProtection device, is based on distribution flexible interconnection device and the new ac and dc systemses Collaborative Control frame for exchanging feeder protection equipmentStructure.The framework builds based on distribution flexible interconnection device and with time cooperation control function to exchange feeder protection equipment with newCollaborative Control communication construction, alternating current-direct current mixing distribution protection control framework include protecting survey correspondingly with breakerDevice, flexible interconnection device and an interchanger are controlled, for the reliability of Ac/dc Power Systems network, is communicated using dual networkStructure, every intelligent apparatus all includes two network interfaces, and A network interfaces and B network interfaces are designated as respectively, and wherein A network interfaces connect interchanger, with monitoringIt is connected, B network interfaces connect the B network interfaces of adjacent intelligent apparatus, realize that network is shaken hands, 61850 communication standards is used between each intelligent apparatus,Using fast fibre network, the data exchange of high speed and mutual locking between each unit are realized by GOOSE mechanism.To the distributionIn non-feeder line tip portion determine region as unit using two neighboring or more than three breakers, network tip portion is with endThe downstream area that tip feeder breaker is split is unit, and whole alternating current-direct current mixing power distribution network is divided into some Minimum Areas,One intelligent apparatus associated region is used as using each Minimum Area；Intelligent apparatus in one protection device associated region is setFor one group, signal is transmitted using multicast and broadcast mode between monitoring, and it is highest preferentially transmission etc. to set remote signalling to conjugate signalLevel；The monitoring docking collection of letters number carries out a logic judgment, tracing trouble and an isolated fault region.
The content of cooperative control method of the flexible direct current interconnect device with exchanging in-situ protection control device is as follows：
Ensure Ac/dc Power Systems safety and stability on the premise of, using the flexible interconnection device based on time cooperation withPower distribution protection control device Collaborative Control framework, according to the quick sensing of direct current power electronic device Microsecond grade in ac and dc systemsesAnd responding ability, coordinate with AC system intelligent apparatus GOOSE rapid communication, sent out in soft straight device and AC system connected regionsDuring raw metallicity three-phase fault, communication area intelligent apparatus receives the quick sensing signal of flexible interconnection device, realizes quick eventPhragma from.When being broken down in direct current region, the rapid locking direct current region of power electronic equipment, it is ensured that communication area failure is not wornMore.Meanwhile, the Intelligent protection measuring controller of communication area is furnished with intelligent distributed FA breakdown judge and isolation features, in exchangeThe region that system is not connected with soft straight device, the safety and stability of communication area is ensured using distributed FA criterion.
Specifically, coordination control strategy is as shown in Figure 2 when in use for this method：
In normal state, central control unit is in data acquisition and total system monitoring mode, direct current interconnecting electric power electricitySub- intelligent cell and harmonics control unit normal communication, carries out information exchange, and will be sent in data.Central control unit phaseWhen in scheduling sub-station, full ac and dc systemses information is controlled in systematic steady state, system is provided under complicated rack environment stableOptimal control, improves utilization rate of equipment and installations, improves direct current power electronic circuitry ability.In addition, central control unit can shift to an earlier dateCommunicated with distribution main website, according to the senior applied analysis function of main website, operation plan is carried out in advance, according to Load flow calculation, networkThe results such as analysis, carry out scheduling controlling strategy in advance, it is ensured that the stabilization of full alternating current-direct current distribution network systems, economical operation.
Under nonserviceabling, each intelligent apparatus in Ac/dc Power Systems enters row information friendship by the communication network of high speedMutually and logic judgment, the control on the spot of fault location and isolation is quickly made, it is to avoid the analysis of central control unit upper layer dataAnd the delay of instruction issuing.In exchange outlet metallicity three-phase occurs for the MMC current changer modules at flexible direct current interconnect device two ends, by the logic judgment built in flexible interconnection device, it can be given in the other time inner sense of Microsecond grade by the rapid drawdown of voltage when short-circuitAdjacent intelligent apparatus is quickly transmitted, and the protection control device in adjacent direct current exit receives the failure letter of flexible interconnection deviceNumber, the harmonics control device to next stage is transmitted, Fault Isolation is made and judges and act.Meanwhile, direct current occurs for DC sideDuring failure, flexible direct current interconnect device recognizes failure, the MMC changes of current of locking straight-flow system both sides prior to AC protection deviceDevice, isolated DC failure prevents fault traversing, and transmitted with high speed fibre passage to AC Intelligent protection measuring controller andThe central control unit of upstream, it is ensured that AC protects not malfunction.
Secondly, when the AC in non-inverting device exit breaks down, flexible direct current interconnect device is unaffected, exchangeThe protection control device of side differentiates and isolated fault that it can be AC that central control unit, which is made, using the distributed FA functions of configurationProtection control device makes aid decision, the processing for the abnormal conditions such as jump of bypassing the immediate leadership communication abnormality, switch failure, switch.
The beneficial effect that the present invention is reached：Flexible interconnection device based on time cooperation is assisted with power distribution protection control deviceLaid the foundation with control on the physical structure of communication, on the seamless transitions of strategy, compared to only consideration AC protection deviceBetween cooperation, this method combination alternating current-direct current mix distribution system fault characteristic, utilize the quick sound of flexible electric electronic deviceCharacteristic is answered, by the foundation of GOOSE high-speed communication networks, failure detection time reduces more than half, effectively enhancing is containing flexibilityThe alternating current-direct current mixing distribution network reliability of interconnect device.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the artFor member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these improve and deformedAlso it should be regarded as protection scope of the present invention.