CN105391033B - Layering for large-scale wind power generation divides domain anti-isolated island guard method - Google Patents

Layering for large-scale wind power generation divides domain anti-isolated island guard method Download PDF

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Publication number
CN105391033B
CN105391033B CN201510824628.8A CN201510824628A CN105391033B CN 105391033 B CN105391033 B CN 105391033B CN 201510824628 A CN201510824628 A CN 201510824628A CN 105391033 B CN105391033 B CN 105391033B
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China
Prior art keywords
isolated island
wind power
power plant
transformer
wind
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CN201510824628.8A
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CN105391033A (en
Inventor
汪宁渤
路亮
丁坤
胡家兵
周识远
熊雪君
李津
李晓龙
陈家乐
陟晶
黄璐涵
孙辰军
摆念宗
魏明磊
黄蓉
孔凡伟
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Huazhong University of Science and Technology
State Grid Corp of China SGCC
State Grid Hebei Electric Power Co Ltd
State Grid Gansu Electric Power Co Ltd
Wind Power Technology Center of Gansu Electric Power Co Ltd
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Huazhong University of Science and Technology
State Grid Corp of China SGCC
State Grid Hebei Electric Power Co Ltd
State Grid Gansu Electric Power Co Ltd
Wind Power Technology Center of Gansu Electric Power Co Ltd
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Priority to CN201510824628.8A priority Critical patent/CN105391033B/en
Publication of CN105391033A publication Critical patent/CN105391033A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/04Emergency 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 transformers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/22Emergency 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
    • H02H7/226Emergency 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 for wires or cables, e.g. heating wires
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/267Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for parallel lines and wires

Abstract

The invention discloses a kind of layerings for large-scale wind power generation to divide domain anti-isolated island guard method, including:All circuit breaker trip signals in monitoring setting wind generator system;Judge that cluster main website sends out interconnection and whether main transformer is all off by cluster main website circuit breaker trip signal, and the isolated island that interconnection and all off formation of main transformer are sent out because of the cluster main website that breaks is protected;Judge whether booster stations transformer fault forms isolated island, and the isolated island formed to booster stations transformer fault is protected by booster stations transformer breaker trip signal;Judge whether wind power plant collection bus failure forms isolated island, and the isolated island formed to wind power plant collection bus failure is protected by wind power plant collection bus circuit breaker trip signal;Judge whether wind power plant current collection feeder fault forms isolated island, and the isolated island formed to wind power plant current collection feeder fault is protected by wind turbine feeder breaker trip signal.Realize the advantages of quick, accurate, efficient, safe and stable.

Description

Layering for large-scale wind power generation divides domain anti-isolated island guard method
Technical field
The present invention relates to the anti-isolated island protection fields of large-scale wind power generation, and in particular, to one kind is directed to large-scale wind The layering of power generation divides domain anti-isolated island guard method.
Background technology
Large Scale Wind Farm Integration (base) island state refers in Large Scale Wind Farm Integration (base) that part Wind turbines are detached from major network Afterwards, continue the operating status to its lower institute on-load power supply.In large-scale wind electricity generation system, isolated island is effectively and timely detected It is of great significance to Wind turbines and local load.In principle and situation and distribution that large-scale wind power access isolated island causes Isolated island is different, so, the harm that isolated island occurs for large-scale wind power access also has not compared with harm of the isolated island in distribution Together.First, after isolated island occurs for large-scale wind power access, power quality is also uncontrollable.But even more serious threat is, Overvoltage problem in islanded system.
The reason of causing overvoltage in Large Scale Wind Farm Integration (base) islanded system has very much, and summary summarizes, and has as follows It is several:1) under some failure situations, islanded system loses system earth;Wind turbine generally by step-up transformer central point Acquisition system zero, when feeder fault, wind turbine and feeder line lose system earth, and non-faulting phase voltage rises to 1.73 times of failure Preceding phase voltage.2) the distinctive fault characteristic of wind turbine, fan converter are usually to carry out current control, and wind turbine passes through transformation step by step Device boosts, and wind turbine is also required to send electric energy to booster stations by longer current collection feeder line, and there are larger in such a system Reactance, system impedance is big, and electromagnetic environment is complex, suddenly under power-off, can generate larger transient overvoltage.3) isolated island system System is time-dependent system, and its damping is smaller, can generate larger transient overvoltage.If 4) when reclosing starts, system It does not power off yet, it may appear that surge voltage, more serious situation are that non-synchronous reclosing occurs, at this moment, it will occur very big temporary State overvoltage.
At present, common power distribution network island detection method is broadly divided into three classes:(1) passive detection method;(2) active detecting Method;(3) detection method based on signal of communication.
The one or more power grid electrical quantity of passive detection method monitoring, according to electrical quantity and the direct deviation of set threshold value, It can be determined that whether interest region occurs island operation state.Abnormal number generally by finding frequency, voltage or phase angle Multiple factor of judgment such as anomalous variation of harmonic wave in value or detecting system can determine the presence of isolated island after comprehensive analysis.
The advantages of passive detection method, is, since the control strategy of gird-connected inverter in itself just needs to detect terminal voltage, This method does not need to increase additional hardware circuit or independent protective relay;It is noiseless to power grid, to power quality without shadow It rings;Under more inverters, detection efficiency will not reduce.Its problem be non-detection region (Non-Detection Zone, NDZ) be possible to quite big, threshold threshold value is difficult to set, and has both been higher than value during normal operation, again less than isolated island when value. In order to reduce NDZ, the sensitivity of device is often improved, but equipment fault-free trip can be caused, influences the normal operation of system;At certain In the case of some specific, NDZ is very big;Certain parameters cannot be measured directly, need complicated calculating that can just obtain, and calculate error And the calculating time can also have an impact detection result.
Active detecting method is injecting voltage, frequency or phase angle in power grid, so as to cause network voltage, frequency or phase The disturbance of parallactic angle, power distribution network when these disturbances are for grid-connected state, due to being clamped down on by the balance of major network, disturbing signal Act on unobvious;But when isolated island occurs, these perturbation actions, can be by checking points of common connection (PCC) with regard to more apparent System responds, to determine whether isolated island occurs.
The advantages of active detecting method, is that NDZ is smaller, and accuracy of detection is higher, can accurately detect isolated island.The method The shortcomings that be due to introducing disturbance quantity, power grid power quality is caused to decline and the unnecessary transient response of power grid;Control is calculated Method is more complicated, and practical application is difficult;Under different load characteristics, there is very big difference in detection result, even fail when serious.
State is cut-off based on what the detection method of signal of communication detected breaker using wired or wireless communication mode, Determine whether isolated island has occurred according to the variation of circuit-breaker status.
Detection method advantage based on signal of communication:Nothing but detection zone (NDZ), detection accurately and reliably;For single or more The isolated island detection of a inverter is all effective;Its performance is unrelated with the type of DG devices, and the normal operation of power grid will not be made Into interference, therefore it is very reliable island detection method.This method shortcoming:It needs to add equipment, cost of implementation is high, and operation is multiple It is miscellaneous, many certifications are needed, economy is low.
Current main method is all the progress isolated island detection in low-voltage network, for the height electricity of large-scale wind power generation The isolated island of pressure grade detects and has no pertinent literature.At present, existing power distribution network isolated island detection related patents are broadly divided into as follows Several classes:
Passive detection method:The patent of Patent No. 201510084241.3 proposes a kind of novel photovoltaic plant passive type Anti- isolated island guard method.The method is applied to large-scale photovoltaic power station and concentrates the substation that is connected to the grid, by calculating power frequency failure Impedance and power factor change, through impedance criterion and power factor criterion, whether comprehensive descision photovoltaic plant occurs, and individually band is negative The small isolated island of lotus operation and photovoltaic plant and substation load carrying big isolated island together, once detect that isolated island is jumped immediately Corresponding grid-connected switch is opened, to protect the safety of operating maintenance personnel and equipment.This method belongs to passive detection method, and with photovoltaic electric It stands as research object.
Active detecting method:The patent of Patent No. 201410221942.2 provides a kind of Wind turbines isolated island test side Method.One isolated island generating means is connected between Wind turbines outlet transformer and wind power plant step-up transformer, passes through adjusting Isolated island generating means makes Wind turbines be in island state, and detects Wind turbines grid entry point three-phase current, three-phase voltage and wind Electric set grid-connection switch state signal, when investigating Wind turbines and whether having island operating capacity and off-grid under anti-isolated island Between.This method belongs to active detecting method.
The patent of Patent No. 201410741339.7 proposes a kind of anti-isolated island experiment detection device of photovoltaic and detection side Method.This anti-isolated island experiment detection device, by host computer, more than one Intelligent power monitoring module, I/O relay control panels, Telegraph key K and adjustable RLC load blocks composition can carry out island effect test to the large copacity power supplies such as photovoltaic plant kind equipment.It is logical Offered load module is crossed, detects grid-connected voltage V to judge whether island phenomenon occurs.This method belongs to active method of testing, and belongs to In the anti-isolated island detection of photovoltaic plant.
The patent of Patent No. 201510037485.6 proposes a kind of the grid-connected of distributed power supply system isolated island effect prevention Switch protection method and grid-connected switching device.The method is that the active carried out for the distributed power supply system of distribution net side is protected Shield, by controlling gird-connected inverter, gives the injections such as its output power, frequency or phase certain disturbance, while detect inverter Output situation;When power grid works normally, due to the balanced action of power grid, disturbing signal is not enough to change gird-connected inverter Output characteristics;When electric network fault or power down, due to the feedback effect of disturbing signal, the output characteristics of gird-connected inverter will Accelerated accumulation and beyond allowed band, generates the protective device that a signal triggers grid-connected switch, makes its tripping.This method is to low Press-fitting power grid carries out anti-isolated island detection.
The patent of Patent No. 201510242085.9 proposes a kind of anti-isolated island protection based on constant impedance load simulation Test circuit and method.The part throttle characteristics of RLC loads in parallel is accurately simulated with constant impedance load simulation unit, grid-connected photovoltaic is inverse The active power for becoming device output is fed to power distribution network with unity power factor, it is ensured that triggers grid-connected photovoltaic inversion during the test The anti-isolated island protection of device.This method belongs to active detecting method.
Detection method based on signal of communication:The patent of Patent No. 201180043345.X proposes a kind of low for detecting The method for pressing isolated island situation in (LV) electric power networks, this method is used in the network of Multi- Switch signal, by detecting network interruption The position signal of road device, and compared with truth table, using the method tabled look-up, and pass through the method pair for disconnecting power electrical unit System is protected.This method carries out isolated island detection for power distribution network, while this method uses less efficient look-up table.
The patent of Patent No. 201210124330.2 provides a kind of station domain isolated island guard method and a kind of station domain isolated island Protection system, by obtaining the location information in substation region with the generation relevant breaker of island operation state, judgement is It is no island operation state occur, and pass through a breaker at tripping electricity generation system networking and isolated island protection act can be completed. This method needle carries out isolated island detection in substation's range, and realizes orphan using a breaker at tripping electricity generation system networking Island is protected, and this method is not particularly suited for the anti-isolated island protection of large-scale wind electricity generation system, is since large-scale wind generates electricity System, the electrical distance of each wind turbine to wind power plant primary substation is longer, and the overvoltage that can cause wind turbine feeder line using this method is asked Topic, so as to influence the service life of wind turbine.
The patent of Patent No. 201310039649.X provides a kind of anti-isolated island protection system of distributed power generation grid-connected system System and its guard method, based on carrier communication and decentralized detection technology, the information that grid side is obtained by upper carrier terminal equipment carries out Isolated island differentiates and the next carrier terminal equipment controls the grid entry point switch of user side distributed generation resource, cuts off distributed generation resource, prevents The only generation of island effect improves reliability and the safety of distributed power generation grid-connected system.This method is directed to distributed power generation System carries out anti-isolated island protection, is protected not for the anti-isolated island of extensive centralized wind-power electricity generation.
The patent of Patent No. 201310086985.X provides a kind of switch changed position isolated island detection based on Wide-area Measurement Information And formula isolated island guard method of directly tripping.During distributed power supply system is incorporated into the power networks, FTU (feedbacks are installed on each switch Line automation terminal), FTU detects the status information of each switch in real time, and the folding condition judgement according to isolated island association switch is No generation islet operation.For judging the distributed generation resource in islet operation, the FTU in the distributed generation resource exit is sent out on the spot Go out the order of isolated island protection, this DG exit is switched and is disconnected, makes its out of service.This method for distributed generation system into The anti-isolated island protection of row, is protected not for the anti-isolated island of extensive centralized wind-power electricity generation.
The patent of Patent No. 201310404177.3 discloses a kind of with low voltage crossing and anti-isolated island defencive function Photovoltaic power station system, by checking the switching signal of grid circuit breaker, voltage signal v and frequency signal f, pass through controller Judgement, and pass through the first breaker of control, isolated island judgement and anti-isolated island defencive function are realized, and by setting three-phase inverter The function of low voltage crossing is realized, so as to which low voltage crossing and anti-isolated island defencive function be coexisted, has reached enhancing photovoltaic electric System stability of standing and the purpose of safety.This method carries out anti-isolated island protection for photovoltaic generating system, not for big rule The anti-isolated island of mould centralization wind-power electricity generation is protected.
The patent of Patent No. 201310560121.7 provides a kind of anti-islet operation system of more plant-grid connection substations. It can fast and accurately pass through judgement for when line fault, main transformer failure and bus-bar fault occurring in 110kV substations region The position of the switch cuts off grid-connected small power supply, avoids that islet operation occurs, damages user's electrical equipment and system irregular operation. This method carries out anti-isolated island protection for photovoltaic generating system, is carried out not for the anti-isolated island of extensive centralized wind-power electricity generation Protection.
The patent of Patent No. 201320048498.X provides a kind of intelligence RLC loads and anti-circuit for detecting island, can The anti-isolated island function of accurate detection user side grid power source.Pass through intelligent RLC load simulations user side power consumption, waveform recording Instrument records inverter output current and grid-connected current signal, judges whether island effect occurs and evaluate the anti-of DC-AC inverter Isolated island protective value.This method carries out isolated island detection in user side low-voltage network, is not carried out in Generation Side high pressure major network Isolated island detects.
The patent of Patent No. 201410521937.3 provides a kind of anti-isolated island protection of substation areas of transformer station and prepared auto restart one Body method.The electric quantity information and switching-state information of acquisition substation's high, medium and low voltage side in real time, is overhauled with reference to prepared auto restart Whether pressing plate puts into or exits, to identify the current operating status of substation's high, medium and low voltage side element;According to physical cabling feelings Condition and live operation demand, by apparatus function pressing plate, the backup power automatic switching function and the protection of anti-isolated island for selecting high, medium and low voltage side are No opening;Setting high, medium and low voltage side is controlled for throwing mode, and the member of the high, medium and low voltage side with identifying before by device software The operating status of part is matched, if mismatched, sends out alarm signal, device locking electric discharge.This method has anti-isolated island protection Function can detect rapidly existing island state and isolated island range in substation, and the photovoltaic plant in tripping respective range Grid-connected switch.This method carries out isolated island detection, and carry out isolated island detection in large-scale wind electricity base just for substation's range.
Paper " based on the distributed power generation isolated island division methods for improving Prim algorithms " is for user side low-voltage network orphan Island problem proposes a kind of minimal spanning tree algorithm based on prim methods and carries out isolated island division.This method needs to consider circuit power Weight to postpone the problem of big so as to which there are anti-isolated island protection acts.
Invention content
It is an object of the present invention in view of the above-mentioned problems, propose that a kind of layering point domain for large-scale wind power generation is prevented Isolated island guard method, to realize the advantages of quick, accurate, efficient, safe and stable.
To achieve the above object, the technical solution adopted by the present invention is:
A kind of layering for large-scale wind power generation divides domain anti-isolated island guard method, including:
S1, monitoring are arranged on all circuit breaker trip signals in wind generator system;
S2, judge that cluster main website sends out interconnection and whether main transformer all breaks by cluster main website circuit breaker trip signal It opens, and the isolated island that interconnection and all off formation of main transformer are sent out because of the cluster main website that breaks is protected;
S3, judge whether booster stations transformer fault forms isolated island by booster stations transformer breaker trip signal, and The isolated island formed to booster stations transformer fault is protected;
S4, judge whether wind power plant collection bus failure forms orphan by wind power plant collection bus circuit breaker trip signal Island, and the isolated island formed to wind power plant collection bus failure is protected;
S5, judge whether wind power plant current collection feeder fault forms isolated island, and right by wind turbine feeder breaker trip signal The isolated island that wind power plant current collection feeder fault is formed is protected.
Preferably,
Above-mentioned S2, judge whether all cluster main website sends out interconnection and main transformer by cluster main website circuit breaker trip signal It disconnects, and the isolated island that interconnection and all off formation of main transformer are sent out because of the cluster main website that breaks is protected, specifically include:
S201:Whether cluster main website circuit breaker trip signal is found, if so, turning S202;If not, turn S3;
S202:Whether cluster main website sends out interconnection and main transformer is all off, if it is not, then do not form isolated island, therefore turns S203;If it is, foring isolated island, turn S204;
S203:Isolated island protection is failure to actuate, and turns S1;
S204:Cut off all wind turbines under the clustered control main website;Turn S1.
Preferably,
Above-mentioned S3, judge whether booster stations transformer fault forms orphan by booster stations transformer breaker trip signal Island, and the isolated island formed to booster stations transformer fault is protected, and is specifically included:
S301, booster stations transformer breaker trip signal whether is found, if so, turning S302;If not, turn S4;
S302, judge that booster stations transformer connects whether low-pressure side collection bus has busbar breaker, and mother open circuit Device is in closed state, if there is busbar breaker and the busbar breaker are in closed state, turns S303;If without mother Connection breaker or busbar breaker are not in closed state, turn S305;
S303, judge after disconnecting failure booster stations transformer, whether output system can overload, if so, turning S304;If It is no, turn S305;
The wind turbine on the feeder line of part under S304, excision failure booster stations station transformer turns S1 to eliminate overload;
S305, failure booster stations transformer is disconnected, turns S4.
Preferably,
Above-mentioned S4, judge whether wind power plant collection bus failure forms by wind power plant collection bus circuit breaker trip signal Isolated island, and the isolated island formed to wind power plant collection bus failure is protected, and is specifically included:
S401:Whether wind power plant collection bus circuit breaker trip signal is found, if so, turning S402;If not, turn S5;
S402:Whether failure wind power plant collection bus has busbar breaker, if so, turning S403, if not, turning S405;
S403:Whether the busbar breaker being connected with failure wind power plant collection bus is judged in closed state, if so, Turn S404, if not, turning S405;
S404:The busbar breaker being connected with failure wind power plant collection bus is disconnected, cuts off failure wind power plant collection bus Under connected all wind turbines, turn S1;
S405:Connected all wind turbines under the failure wind power plant collection bus are cut off, turn S1.
Preferably,
Above-mentioned S5, judge whether wind power plant current collection feeder fault forms isolated island by wind turbine feeder breaker trip signal, And the isolated island formed to wind power plant current collection feeder fault is protected, and is specifically included:
S501:It was found that wind turbine feeder breaker trip signal, if not, turning S1, if so, turning S502;
S502:All wind turbines on failure wind power plant current collection feeder line are cut off, turn S1.
Technical scheme of the present invention has the advantages that:
Technical scheme of the present invention for large-scale wind electricity generation system, in mains side high pressure major network, carries out layering point domain Isolated island detection and anti-isolated island guard method, have it is quick, accurately, efficiently, it is safe and stable the advantages of.Technical solution of the present invention Anti- isolated island detection is carried out for mains side high pressure major network, meanwhile, circuit weight is not considered, can faster carry out anti-isolated island guarantor Shield acts.
Below by drawings and examples, technical scheme of the present invention is described in further detail.
Description of the drawings
Fig. 1 is the stream for dividing the anti-isolated island guard method in domain for large-scale wind power generation described in the embodiment of the present invention Cheng Tu;
Fig. 2 is the wind power plant basic topology figure described in the embodiment of the present invention;
Fig. 3 is the wind-powered electricity generation station cluster topology graph described in the embodiment of the present invention;
Fig. 4 is that topological diagram is sent out in the wind-powered electricity generation station described in the embodiment of the present invention.
With reference to attached drawing, reference numeral is as follows in the embodiment of the present invention:
In Fig. 2,42- booster stations transformer breaker two;62- wind power plant collection bus breaker two;1013、1063、 1073rd, 1083,1143,1153- towers send wire-outgoing breaker;1061- wind turbines six;1141- wind turbines 14;1062nd, 1142- wind turbines Breaker.
Specific embodiment
The preferred embodiment of the present invention is illustrated below in conjunction with attached drawing, it should be understood that preferred reality described herein It applies example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
A kind of layering for large-scale wind power generation divides domain anti-isolated island guard method, including:
S1, monitoring are arranged on all circuit breaker trip signals in wind generator system;
S2, judge that cluster main website sends out interconnection and whether main transformer all breaks by cluster main website circuit breaker trip signal It opens, and the isolated island that interconnection and all off formation of main transformer are sent out because of the cluster main website that breaks is protected;
S3, judge whether booster stations transformer fault forms isolated island by booster stations transformer breaker trip signal, and The isolated island formed to booster stations transformer fault is protected;
S4, judge whether wind power plant collection bus failure forms orphan by wind power plant collection bus circuit breaker trip signal Island, and the isolated island formed to wind power plant collection bus failure is protected;
S5, judge whether wind power plant current collection feeder fault forms isolated island, and right by wind turbine feeder breaker trip signal The isolated island that wind power plant current collection feeder fault is formed is protected.
Preferably,
Above-mentioned S2, judge whether all cluster main website sends out interconnection and main transformer by cluster main website circuit breaker trip signal It disconnects, and the isolated island that interconnection and all off formation of main transformer are sent out because of the cluster main website that breaks is protected, specifically include:
S201:Whether cluster main website circuit breaker trip signal is found, if so, turning S202;If not, turn S3;
S202:Whether cluster main website sends out interconnection and main transformer is all off, if it is not, then do not form isolated island, therefore turns S203;If it is, foring isolated island, turn S204;
S203:Isolated island protection is failure to actuate, and turns S1;
S204:Cut off all wind turbines under the clustered control main website;Turn S1.
Preferably,
Above-mentioned S3, judge whether booster stations transformer fault forms orphan by booster stations transformer breaker trip signal Island, and the isolated island formed to booster stations transformer fault is protected, and is specifically included:
S301, booster stations transformer breaker trip signal whether is found, if so, turning S302;If not, turn S4;
S302, judge that booster stations transformer connects whether low-pressure side collection bus has busbar breaker, and mother open circuit Device is in closed state, if there is busbar breaker and the busbar breaker are in closed state, turns S303;If without mother Connection breaker or busbar breaker are not in closed state, turn S305;
S303, judge after disconnecting failure booster stations transformer, whether output system can overload, if so, turning S304;If It is no, turn S305;
The wind turbine on the feeder line of part under S304, excision failure booster stations station transformer turns S1 to eliminate overload;
S305, failure booster stations transformer is disconnected, turns S4.
Preferably,
Above-mentioned S4, judge whether wind power plant collection bus failure forms by wind power plant collection bus circuit breaker trip signal Isolated island, and the isolated island formed to wind power plant collection bus failure is protected, and is specifically included:
S401:Whether wind power plant collection bus circuit breaker trip signal is found, if so, turning S402;If not, turn S5;
S402:Whether failure wind power plant collection bus has busbar breaker, if so, turning S403, if not, turning S405;
S403:Whether the busbar breaker being connected with failure wind power plant collection bus is judged in closed state, if so, Turn S404, if not, turning S405;
S404:The busbar breaker being connected with failure wind power plant collection bus is disconnected, cuts off failure wind power plant collection bus Under connected all wind turbines, turn S1;
S405:Connected all wind turbines under the failure wind power plant collection bus are cut off, turn S1.
Preferably,
Above-mentioned S5, judge whether wind power plant current collection feeder fault forms isolated island by wind turbine feeder breaker trip signal, And the isolated island formed to wind power plant current collection feeder fault is protected, and is specifically included:
S501:It was found that wind turbine feeder breaker trip signal, if not, turning S1, if so, turning S502;
S502:All wind turbines on failure wind power plant current collection feeder line are cut off, turn S1.
Most preferably a kind of embodiment of this method is:
As shown in Figure 1, a kind of layering for large-scale wind power generation divides domain anti-isolated island guard method, including:
Step 1:System starts, monitoring breaker trip signal;
Step 2:Whether cluster main website circuit breaker trip signal is found, if so, going to step 3;If not, go to step 6;
Step 3:Whether cluster main website, which sends out interconnection and main transformer, is all disconnectedIf it is not, then not forming isolated island, therefore turn Step 4;If it is, foring isolated island, 5 are gone to step;
Step 4:Isolated island protection is failure to actuate, and goes to step 1;
Step 5:Cut off all wind turbines under the clustered control main website;Go to step 1;
Step 6:Whether booster stations transformer breaker trip signal is foundIf so, go to step 7;If not, it goes to step 11;
Step 7:It connects whether low-pressure side collection bus has busbar breaker and in closed stateIf so, turn step Rapid 8;If not, go to step 10;
Step 8:Whether other booster stations transformers can overloadIf so, go to step 9;If not, go to step 10;
Step 9:The wind turbine on the part feeder line under the booster stations is cut off to eliminate overload, and goes to step 1;
Step 10:Failure booster stations transformer is disconnected, goes to step 4;
Step 11:Whether wind power plant collection bus circuit breaker trip signal is foundIf so, go to step 12;If not, turn Step 16;
Step 12:Whether the collection bus has busbar breakerIf so, go to step 13;If not, go to step 15;
Step 13:Whether busbar breaker is in closed stateIf so, 14 are gone to step, if not, going to step 15;
Step 14:Busbar breaker is disconnected, connected all wind turbines under the collection bus is cut off, goes to step 1;
Step 15:Connected all wind turbines under the collection bus are cut off, go to step 1;
Step 16:It was found that wind turbine feeder breaker trip signalIf not, go to step 1;If so, go to step 17;
Step 17:All wind turbines on the feeder line are cut off, go to step 1.
As shown in Fig. 2, for a wind power plant basic topology figure, the wind power plant is altogether comprising wind turbine 31, every seven Fans Wire-outgoing breaker is sent to be connected with a current collection feeder line by blower break device and tower respectively, the fan field totally four current collection feedbacks Line.Current collection feeder line is connected respectively by current collection feeder breaker with collection bus, two collection bus is shared in Fig. 2, respectively Collection bus 1 and collection bus 2 72 are connected by busbar breaker 8 between two collection bus.Collection bus is by rising Pressure transformer is connected with 110KV busbares, most sends out line 3 through 110KV afterwards and grid side breaker 2 is connected to power grid 1.
When protection system starts, each circuit breaker trip signal is monitored.
Situation one:If wind power plant current collection feeder line 1 and current collection feeder line 2 102 break down, current collection protection for feed line system Failure is recognized, trip signal, isolated island monitoring for protection are sent out to current collection feeder breaker 1 and current collection feeder breaker 2 92 To trip signal.
Step 2 is performed, it is found not to be cluster main website circuit breaker trip signal;
Step 6 is performed, it is found not to be booster stations transformer breaker trip signal;
Step 11 is performed, it is found not to be wind power plant busbar circuit breaker trip signal;
Step 16 is performed, is the discovery that wind turbine feeder breaker trip signal.Current collection feeder line 1 and current collection feeder line two at this time Wind turbine under 102 forms two isolated islands.
Step 17 is performed, isolated island protection system is sent out to all wind turbines under current collection feeder line 1 and current collection feeder line 2 102 Sub-gate signal, wind turbine 1 to wind turbine 7 1071 receives cutting machine signal with wind turbine 8 1081 to wind turbine 15, to wind turbine Breaker 1012 to blower break device 1072 and blower break device 1082 to blower break device 1152 sends out sub-gate signal, and wind turbine breaks Road device is all off, completes isolated island protection;
Step 1 is performed, re-starts monitoring.
Situation two:If wind power plant collection bus 1 breaks down, busbar breaker 8 is in closed state, protects system Failure is recognized, trip signal, isolated island monitoring for protection to trip signal are sent out to collection bus breaker 1.
Step 2 is performed, it is found not to be cluster main website circuit breaker trip signal;
Step 6 is performed, it is found not to be booster stations transformer breaker trip signal;
Step 11 is performed, is the discovery that one 61 trip signal of wind power plant collection bus breaker;
Step 12 is performed, it is found that collection bus 1 has busbar breaker 8;
Step 13 is performed, it is found that busbar breaker 8 is in closed state;
Step 14 is performed, disconnects busbar breaker 8, all wind turbines under collection bus 1 form an isolated island at this time. Isolated island protection system connected all wind turbines under collection bus 1 send out sub-gate signal.Wind turbine 1 is to wind turbine 7 1071 Cutting machine signal is received with wind turbine 8 1081 to wind turbine 15, to wind turbine breaker 1012 to blower break device 1072 and wind turbine Breaker 1082 to blower break device 1152 sends out sub-gate signal, and blower break device is all off, completes isolated island protection;
Step 1 is performed, re-starts monitoring.
Situation three:If wind power plant booster stations transformer 1 breaks down, busbar breaker 8 is in closed state, each Breaker capacity is enough, will not overload.System identification is protected to become electric appliance open circuit to booster stations to booster stations transformer fault Device 1 sends out trip signal, isolated island monitoring for protection to trip signal.
Step 2 is performed, it is found not to be cluster main website circuit breaker trip signal;
Step 6 is performed, is the discovery that one 41 trip signal of booster stations transformer breaker;
Step 7 is performed, it is found that one 41 low-pressure side collection bus 1 of booster stations transformer breaker has busbar breaker 8, And busbar breaker 8 is in closed state;
Step 8 is performed, it is found that other breaker capacity are enough, will not overload;
Perform step 10, disconnect booster stations transformer 1, the wind turbine of lower connection can via busbar breaker 8, collect Busbar 2 72, booster stations transformer 2 52 continue to run with, and do not form isolated island.
Step 4 is performed, isolated island protection is failure to actuate;
Step 1 is performed, re-starts monitoring.
As shown in figure 3, for a wind-powered electricity generation station cluster topology graph.In the topological diagram, wind power plant one, wind power plant two, wind power plant Three and power station one distinguish boosted transformer one to step-up transformer five, 110KV busbares one to 110KV busbares five, inlet-outlet line One is concentrated to 110KV busbares six to inlet-outlet line five.330KV is connected to via three-winding transformer one and three-winding transformer two to become Power station.Three-winding transformer one is made of 330KV sides, 110KV sides and 35KV sides, and three-winding transformer two can similarly obtain.
When protection system starts, each circuit breaker trip signal is monitored.
If the 330KV sides of three-winding transformer one and the 35KV sides of three-winding transformer two are broken down, protection system is known Failure is clipped to, trip signal, isolated island monitoring for protection to trip signal are sent out to cluster main website breaker.
Step 2 is performed, is the discovery that cluster main website i.e. 330KV transformation stations circuit breaker trip signal;
Step 3 is performed, the three-winding transformer one and three-winding transformer two for finding connection cluster main website disconnect, therefore Form isolated island;
Step 5 is performed, disconnects all wind power plants under cluster main website, that is, 330KV transformation stations, completes isolated island protection;
Step 1 is performed, re-starts monitoring.
As shown in figure 4, send out topological diagram for a wind-powered electricity generation station.In the topological diagram, wind power plant one, wind power plant two, wind power plant Three and wind power plant four send out line one through 110KV respectively and send out line four to 110KV and be connected to 330KV substations two, photovoltaic DC field warp 330KV sends out line five and is directly connected to 330KV substations two.330KV substations two meet 330KV through busbar one, busbar two respectively and become Power station three connects busbar three and is connected to 330KV substations one again, is finally connected to major network.
When protection system starts, each circuit breaker trip signal is monitored.
If busbar one and busbar two break down, protection system identification is to failure, to cluster main website, that is, 330KV substations one Breaker sends out trip signal, isolated island monitoring for protection to trip signal.
Step 2 is performed, is the discovery that cluster main website i.e. one circuit breaker trip signal of 330KV substations;
Step 3 is performed, it is found that the submitting circuit of connection cluster main website, that is, 330KV substations one disconnects, therefore form Isolated island;
Step 5 is performed, disconnects the cluster main website, that is, all wind power plants of 330KV transformation stations once, completes isolated island protection;
Step 1 is performed, re-starts monitoring.
Finally it should be noted that:The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used To modify to the technical solution recorded in foregoing embodiments or carry out equivalent replacement to which part technical characteristic. All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention's Within protection domain.

Claims (4)

1. a kind of layering for large-scale wind power generation divides domain anti-isolated island guard method, which is characterized in that including:
S1, monitoring are arranged on all circuit breaker trip signals in wind generator system;
S2, judge that cluster main website sends out interconnection and whether main transformer is all off by cluster main website circuit breaker trip signal, and The isolated island that interconnection and all off formation of main transformer are sent out because of the cluster main website that breaks is protected;
S3, judge whether booster stations transformer fault forms isolated island by booster stations transformer breaker trip signal, and to rising The isolated island that pressure station transformer fault is formed is protected;
S4, judge whether wind power plant collection bus failure forms isolated island by wind power plant collection bus circuit breaker trip signal, and The isolated island formed to wind power plant collection bus failure is protected;
S5, judge whether wind power plant current collection feeder fault forms isolated island, and to wind-powered electricity generation by wind turbine feeder breaker trip signal The isolated island that field current collection feeder fault is formed is protected;
Above-mentioned S2, judge that cluster main website sends out interconnection and whether main transformer all breaks by cluster main website circuit breaker trip signal It opens, and the isolated island that interconnection and all off formation of main transformer are sent out because of the cluster main website that breaks is protected, specifically include:
S201:Whether cluster main website circuit breaker trip signal is found, if so, turning S202;If not, turn S3;
S202:Whether cluster main website send out interconnection and main transformer it is all off, if it is not, then not forming isolated island, therefore turn S203; If it is, foring isolated island, turn S204;
S203:Isolated island protection is failure to actuate, and turns S1;
S204:Cut off all wind turbines under the cluster main website;Turn S1.
2. the layering according to claim 1 for large-scale wind power generation divides domain anti-isolated island guard method, feature exists In,
Above-mentioned S3, judge whether booster stations transformer fault forms isolated island by booster stations transformer breaker trip signal, and The isolated island formed to booster stations transformer fault is protected, and is specifically included:
S301, booster stations transformer breaker trip signal whether is found, if so, turning S302;If not, turn S4;
S302, judge that booster stations transformer connects whether low-pressure side collection bus has busbar breaker, and at the busbar breaker In closed state, if there is busbar breaker and the busbar breaker are in closed state, turn S303;If break without mother Road device or busbar breaker are not in closed state, turn S305;
S303, judge after disconnecting failure booster stations transformer, whether output system can overload, if so, turning S304;If not, Turn S305;
Wind turbine on S304, excision failure booster stations transformer lower part feeder line turns S1 to eliminate overload;
S305, failure booster stations transformer is disconnected, turns S203.
3. the layering according to claim 2 for large-scale wind power generation divides domain anti-isolated island guard method, feature exists In,
Above-mentioned S4, judge whether wind power plant collection bus failure forms orphan by wind power plant collection bus circuit breaker trip signal Island, and the isolated island formed to wind power plant collection bus failure is protected, and is specifically included:
S401:Whether wind power plant collection bus circuit breaker trip signal is found, if so, turning S402;If not, turn S5;
S402:Whether failure wind power plant collection bus has busbar breaker, if so, turning S403, if not, turning S405;
S403:Whether the busbar breaker being connected with failure wind power plant collection bus is judged in closed state, if so, turning S404, if not, turning S405;
S404:The busbar breaker being connected with failure wind power plant collection bus is disconnected, cuts off institute under failure wind power plant collection bus All wind turbines even, turn S1;
S405:Connected all wind turbines under the failure wind power plant collection bus are cut off, turn S1.
4. the layering according to claim 3 for large-scale wind power generation divides domain anti-isolated island guard method, feature exists In,
Above-mentioned S5, judge whether wind power plant current collection feeder fault forms isolated island, and right by wind turbine feeder breaker trip signal The isolated island that wind power plant current collection feeder fault is formed is protected, and is specifically included:
S501:It was found that wind turbine feeder breaker trip signal, if not, turning S1, if so, turning S502;
S502:All wind turbines on failure wind power plant current collection feeder line are cut off, turn S1.
CN201510824628.8A 2015-11-24 2015-11-24 Layering for large-scale wind power generation divides domain anti-isolated island guard method Expired - Fee Related CN105391033B (en)

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