CN105978017A - Method for detection and protection of island with anti-theft and anti-tripping function aiming at large-scale wind power - Google Patents
Method for detection and protection of island with anti-theft and anti-tripping function aiming at large-scale wind power Download PDFInfo
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- CN105978017A CN105978017A CN201510822693.7A CN201510822693A CN105978017A CN 105978017 A CN105978017 A CN 105978017A CN 201510822693 A CN201510822693 A CN 201510822693A CN 105978017 A CN105978017 A CN 105978017A
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The present invention discloses a method for detection and protection of an island with an anti-theft and anti-tripping function aiming at large-scale wind power. The method comprises: initializing a node type table and a node connection table; monitoring breaker tripping signals in a power grid, updating the node connection table according to the monitored breaker tripping signals, and starting a anti-theft and anti-tripping function module at the same time; and determining whether an island is formed or not according to the updated node connection table. Aiming at a large-scale wind power generation system, the island detection and the protection from an island are performed at the high-voltage main grid of the power supply, and therefore the method for detection and protection of island with an anti-theft and anti-tripping function aiming at large-scale wind power is rapid, accurate, efficient, safe and stable. According to the technical scheme, the method for detection and protection of island with an anti-theft and anti-tripping function aiming at large-scale wind power does not need to consider the line weight and can rapidly perform protection from an island.
Description
Technical field
The present invention relates to large-scale wind generating anti-isolated island protection field, in particular it relates to one is for large-scale wind power
There is the method for detecting and protecting isolated island of anti-jump function.
Background technology
Large Scale Wind Farm Integration (base) island state refers in Large Scale Wind Farm Integration (base), and part Wind turbines departs from major network
After, continue the running status powered to its lower institute on-load.In large-scale wind electricity generation system, detect isolated island effectively and timely
Significant to Wind turbines and local load.Large-scale wind power accesses in the principle and situation and distribution that isolated island causes
Isolated island is different, so, large-scale wind power access the harm in distribution of harm and isolated island that isolated island occurs compared with also have not
With.First, large-scale wind power accesses after there is isolated island, and the quality of power supply is also uncontrollable.But even more serious threat is,
Overvoltage problem in islanded system.
Causing the reason of overvoltage in Large Scale Wind Farm Integration (base) islanded system to have a lot, summary summarizes, and has as follows
Several: 1) under some failure situations, islanded system loses system earth；Blower fan is generally by the central point of booster transformer
Acquisition system zero point, when feeder fault, blower fan and feeder line lose system earth, and healthy phases voltage rises to the fault of 1.73 times
Front phase voltage, principle is as shown in Figure 1.2) the distinctive fault characteristic of blower fan, fan converter usually carries out electric current control, wind
Machine is boosted by transformator step by step, and blower fan is also required to, by longer current collection feeder line, electric energy is delivered to booster stations, at this is
There is bigger reactance in system, system impedance is big, and electromagnetic environment is complex, under unexpected power-off, can produce bigger transient state
Overvoltage.3) islanded system is time-dependent system, and its damping is less, can produce bigger transient overvoltage.4) if at weight
When combined floodgate starts, system power-off not yet, it may appear that surge voltage, more serious situation is that non-synchronous reclosing occurs, at this moment, will
There will be the biggest transient overvoltage.
At present, conventional 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.
Passive detection method monitors one or more electrical network electric parameters, according to electric parameters and the direct deviation of set threshold value,
Can be determined that whether interest region occurs island operation state.Typically by finding frequency, voltage or the abnormal number at phase angle
Multiple factor of judgment such as ANOMALOUS VARIATIONS of harmonic wave in value or detecting system, comprehensive analyze after may determine that the existence of isolated island.
The advantage of passive detection method is, owing to the control strategy of combining inverter itself is accomplished by test side voltage,
This method need not increase extra hardware circuit or independent protective relay；Noiseless to electrical network, to the quality of power supply without shadow
Ring；Under multiple stage inverter, detection efficiency will not reduce.It has a problem in that non-detection region (Non-Detection Zone,
NDZ) the biggest, threshold threshold value is difficult to set, value when being both higher than properly functioning, again less than value during isolated island.
In order to reduce NDZ, often improve the sensitivity of device, but equipment fault-free trip can be caused, affect the properly functioning of system；At certain
In the case of the most specific, NDZ is the biggest；Some parameter can not directly be measured, and needs complicated calculating just can obtain, and it calculates error
And the calculating time also can produce impact to Detection results.
Active detecting method is injecting voltage, frequency or phase angle in electrical network, thus causes line voltage, frequency or phase
The disturbance of parallactic angle, these disturbances are for power distribution network during state that is incorporated into the power networks, owing to the balance by major network is clamped down on, disturbing signal
Act on inconspicuous；But when isolated island occurs, these perturbation actions are the most more apparent, can be by checking points of common connection (PCC)
System responds, and judges whether isolated island.
The advantage of active detecting method is that NDZ is less, and accuracy of detection is higher, it is possible to detect isolated island exactly.The method
Shortcoming be owing to introducing disturbance quantity, cause the electrical network quality of power supply to decline and the unnecessary transient response of electrical network；Control to calculate
Method is more complicated, actual application difficult；Under different load characteristics, there is the biggest difference in Detection results, even lost efficacy time serious.
Detection method based on signal of communication uses what wired or wireless communication mode detected chopper to cut-off state,
Change according to circuit-breaker status determines whether to there occurs isolated island.
Detection method advantage based on signal of communication: detection zone (NDZ), detection are accurately and reliably nothing but；For single or many
The isolated island detection of individual inverter is the most effective；Its performance is unrelated with the type of DG device, also will not make the properly functioning of electrical network
Become interference, be therefore very reliable island detection method.This method shortcoming: need to add equipment, it is achieved cost is high, operation is multiple
Miscellaneous, need a lot of certification, economy is low.
Current main method is all to carry out isolated island detection in low-voltage network, for the high electricity of large-scale wind generating
The isolated island of pressure grade detects and has no pertinent literature.At present, existing power distribution network isolated island detection Patents is 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 transformer station that is connected to the grid, and becomes by calculating power frequency fault impedance and power factor
Change, through impedance criterion and power factor criterion, comprehensive descision whether occur the independent load carrying little isolated island of photovoltaic plant with
And photovoltaic plant load carrying big isolated island together with transformer station, once detect the corresponding grid-connected switch of isolated island tripping immediately,
With protection operating maintenance personnel and the safety of equipment.The method belongs to passive detection method, and with photovoltaic plant as object of study.
Active detecting method:
The patent of Patent No. 201410221942.2 provides a kind of Wind turbines isolated island method of testing.One isolated island is occurred
Device is connected between Wind turbines outlet transformer and wind energy turbine set booster transformer, makes wind-powered electricity generation by regulation isolated island generating means
Unit is in island state, and detects Wind turbines the grid-connected on off state of site three-phase current, three-phase voltage and Wind turbines
Signal, investigates whether Wind turbines possesses islet operation ability, and the off-grid time under anti-isolated island.The method belongs to actively inspection
Survey method.
The patent of Patent No. 201410741339.7 proposes a kind of photovoltaic anti-isolated island experiment detection device and detection side
Method.This anti-isolated island experiment detection device, by host computer, more than one Intelligent power monitoring module, I/O Control plate,
Telegraph key K and adjustable RLC load blocks composition, can carry out island effect test to Large Copacity power supply kind equipments such as photovoltaic plants.Logical
Cross offered load module, detect grid-connected voltage V to judge whether island phenomenon occurs.The method belongs to actively method of testing, and belongs to
Detect in the anti-isolated island of photovoltaic plant.
The patent of Patent No. 201510037485.6 proposes the grid-connected of a kind of distributed power supply system isolated island effect prevention
Switch protection method and grid-connected switching device.The method is that the active that the distributed power supply system for power distribution network side is carried out is protected
Protect, by controlling combining inverter, inject certain disturbance to its output, frequency or phase place etc., detect inverter simultaneously
Output situation；When electrical network normally works, due to the balanced action of electrical network, disturbing signal is not enough to change combining inverter
Output characteristics；When electric network fault or power down, due to the feedback effect of disturbing signal, the output characteristics of combining inverter is just
Understand accelerated accumulation and beyond allowed band, produce a signal and trigger the protection device of grid-connected switch so that it is tripping operation.The method pair
Low-voltage network carries out anti-isolated island detection.
The patent of Patent No. 201510242085.9 proposes the protection of a kind of anti-isolated island based on constant impedance load simulation
Test circuit and method.The part throttle characteristics of RLC load in parallel is accurately simulated, by grid-connected photovoltaic with constant impedance load simulation unit
The active power of inverter output is fed to power distribution network with unity power factor, it is ensured that trigger grid-connected photovoltaic in test process inverse
Become the anti-isolated island protection of device.The method belongs to active detecting method.
Detection method based on signal of communication:
The patent of Patent No. 201180043345.X proposes a kind of for detecting isolated island situation in low pressure (LV) electric power networks
Method, the method is in the network of Multi-Switch signal, by the position signalling of chopper in detection network, and and truth table
Contrast, use the method tabled look-up, and by the method disconnecting power electrical unit, system is protected.The method is for joining
Electrical network carries out isolated island detection, and the method uses inefficient look-up table simultaneously.
The patent of Patent No. 201210124330.2 provides a kind of station territory isolated island guard method and territory, a kind of station isolated island
Protection system, by the positional information of chopper relevant to producing island operation state in obtaining transformer station region, it is judged that be
No there is island operation state, and can complete isolated island protection act by a chopper at tripping electricity generation system networking.
The method pin carries out isolated island detection in transformer station's scope, and uses a chopper at tripping electricity generation system networking to realize orphan
Island is protected, and this method is not particularly suited for the anti-isolated island protection of large-scale wind electricity generation system, owing to large-scale wind generating is
System, each blower fan is longer to the electrical distance of wind energy turbine set primary substation, uses the method that the overvoltage of blower fan feeder line can be caused to ask
Topic, thus affect the service life of blower fan.
The patent of Patent No. 201310039649.X provides a kind of distributed power generation grid-connected system anti-isolated island protection
System and guard method thereof, based on carrier communication and decentralized detection technology, the information being obtained grid side by upper carrier terminal equipment is carried out
Isolated island differentiates and the also site switch of user side distributed power source is controlled by the next carrier terminal equipment, excises distributed power source, anti-
The only generation of island effect, improves reliability and the safety of distributed power generation grid-connected system.The method is for distributed power generation
System carries out anti-isolated island protection, is not related to the anti-isolated island protection of extensive centralized wind-power electricity generation.
The patent of Patent No. 201310086985.X provides the detection of a kind of switch changed position isolated island based on Wide-area Measurement Information
And directly tripping operation formula isolated island guard method.During distributed power supply system is incorporated into the power networks, each switch is installed FTU(feedback
Line automation terminal), FTU detects the status information of each switch in real time, judges according to the folding condition of isolated island association switch
Whether there is islet operation.For judging to be in the distributed power source of islet operation, the FTU in this distributed power source exit is just
Send isolated island protection order, this DG exit is switched off so that it is out of service.The method is for distributed power generation
System carries out anti-isolated island protection, is not related to the anti-isolated island protection of extensive centralized wind-power electricity generation.
The patent of Patent No. 201310404177.3 discloses one and has low voltage crossing and anti-isolated island defencive function
Photovoltaic power station system, by check grid circuit breaker switching signal, voltage signal v and frequency signal f, pass through controller
Judgement, and by controlling the first chopper, it is achieved that isolated island judges and anti-isolated island defencive function, and by arranging three-phase inversion
Device achieves the function of low voltage crossing, thus low voltage crossing and anti-isolated island defencive function is coexisted, and has reached enhancing photovoltaic
Electric power station system stability and the purpose of safety.The method carries out anti-isolated island protection for photovoltaic generating system, is not related to big
The anti-isolated island protection of scale land management formula wind-power electricity generation.
The patent of Patent No. 201310560121.7 provides a kind of many plant-grid connection transformer station anti-islet operation system.
Can pass through fast and accurately to judge when generation line fault, main transformer fault and bus-bar fault in 110kV transformer station region
The position of the switch cuts off grid-connected small power supply, it is to avoid islet operation occurs, and damages user's electrical equipment and system irregular operation.
The method carries out anti-isolated island protection for photovoltaic generating system, and the anti-isolated island being not related to extensive centralized wind-power electricity generation is protected
Protect.
The patent of Patent No. 201320048498.X provides a kind of intelligence RLC load and anti-circuit for detecting island, can
The accurately anti-isolated island function of detection user side grid power source.By intelligence RLC load simulation user side power consumption, waveform recording
Instrument record inverter output current and grid-connected current signal, it is judged that whether island effect occurs and evaluate the anti-of DC-AC inverter
Isolated island protective value.The method carries out isolated island detection in the low-voltage network of user side, is not related at Generation Side high pressure major network
Carry out isolated island detection.
The patent of Patent No. 201410521937.3 provides a kind of substation areas of transformer station anti-isolated island protection and prepared auto restart one
Body method.The electric quantity information of Real-time Collection transformer station high, medium and low voltage side and switching-state information, overhaul in conjunction with prepared auto restart
Whether pressing plate puts into or exits, and identifies the running status that transformer station's high, medium and low voltage side element is current；According to physical cabling feelings
Condition and on-the-spot operation demand, by apparatus function pressing plate, select the backup power automatic switching function of high, medium and low voltage side and anti-isolated island to protect and be
No opening；Control to set high, medium and low voltage side by device software for throwing mode and first with the high, medium and low voltage side identified before
The running status of part is mated, if do not mated, sends out warning signal, and device locking is discharged.The method possesses the protection of anti-isolated island
Photovoltaic plant in function, the island state existed in transformer station can be detected rapidly and isolated island scope, and tripping respective range
Grid-connected switch.The method carries out isolated island detection just for transformer station's scope, is not related to carry out isolated island inspection in large-scale wind electricity base
Survey.
Paper " the distributed power generation isolated island division methods based on improving Prim algorithm " is lonely for user side low-voltage network
Island problem proposes a kind of minimal spanning tree algorithm based on prim method and carries out isolated island division, and the method is not related to mains side
High pressure major network carries out anti-isolated island detection, considers circuit weight because of needs simultaneously, and the most anti-isolated island protection act postpones bigger.
Summary of the invention
It is an object of the invention to, for the problems referred to above, propose a kind of for large-scale wind power, there is anti-jump function
Method for detecting and protecting isolated island, to realize quickly, accurately, efficiently, safe and stable advantage.
For achieving the above object, the technical solution used in the present invention is:
A kind of method for detecting and protecting isolated island for large-scale wind power with anti-jump function, including:
Initialize node type table and the step of node connection table；
Circuit breaker trip signal in monitoring electrical network, and according to the circuit breaker trip signal update node connection table of monitoring, simultaneously
Start the step of anti-theft mode hopping block；
And
According to the node connection table after updating, it may be judged whether form the step of isolated island.
Preferably, described initialization node type table and the step of node connection table, particularly as follows:
Step 1, initialization node type table: set total n node in network, the generating set in network is initialized as 1, negative
Lotus node initializing is 2, and the root node in monitoring network is set to 3, and remaining node is set to 0, wherein, is initialized as the joint of 1 or 2
Point is fringe node, and the node being initialized as 0 is internal node；
Initialize node connection table: for comprising the network of n node, for any two node A and B, if A, B two is between node
Have 1 power circuit to connect and circuit is in connection status, then in table, A row B row put 1, have two to be then set to 2, if A, B two node
Between unregulated power connection or connection line be off, then in table, A row B row set to 0.
Preferably, the circuit breaker trip signal in described monitoring electrical network, and according to the circuit breaker trip signal update of monitoring
Node connection table, starts the step of anti-theft mode hopping block simultaneously, specifically includes:
Step 2: the circuit breaker trip signal in monitoring electrical network, starts anti-theft mode hopping block simultaneously；
Step 3: whether find circuit breaker trip signal, if without trip signal, returns step 2, enters if monitoring trip signal
Step 4；
Step 4: more new node connection table, initializes output node storehouse, and empties output node storehouse；
Step 5: initialize trip signal storehouse, empty trip signal storehouse；Initialize trip signal counter, and will meter
Number device sets to 0；
Step 6: circuit breaker trip signal is pressed into one by one trip signal storehouse, and is jumped by trip signal number counter records
The number of lock signal.
Preferably, described step 6 circuit breaker trip signal is pressed into trip signal storehouse one by one particularly as follows:
If the chopper connecting two nodes of A, B trips, if node A is more farther to the distance of root node than node B distance, then
By d(A, B) signal press-in trip signal storehouse, otherwise then by d(B, A) press-in trip signal storehouse.
Preferably, described step 2 starts anti-theft mode hopping block, particularly as follows: start thread to carry out anti-jump detection, if sent out
Existing node jump, uses interrupt mode to process jump, and saving scene, and preferred process jump event, jump event handling is complete
Cheng Hou, restoring scene, continue with anti-isolated island protection event.
Preferably, described according to the node connection table after updating, it may be judged whether the step forming isolated island specifically includes:
Step 7: judge the trip signal in trip signal counter whether more than 0, no, go to step 2；It is to go to step 8；
Step 8: initialize isolated island node counter juxtaposition 0；
Step 9: initialize isolated island node storehouse, empty isolated island node storehouse；
Step 10: eject a trip signal, trip signal counter-1 from trip signal storehouse；
Step 11: by corresponding for the trip signal of above-mentioned ejection node press-in isolated island node storehouse, isolated island node counter+
1；
Step 12: eject a node, isolated island node counter-1 from isolated island node storehouse
Step 13: judge whether this node is root node according to the node state table after updating, if root node, go to step 14；
No, then go to step 15；
Step 14: empty isolated island node storehouse, empties isolated island node counter, goes to step 7；
Step 15: the node ejected from isolated island node storehouse is compared one by one with the node in trip signal storehouse whether phase
With, if it is different, and go to step 17；If having identical, then go to step 16；
Step 16: after rejecting this same node point from trip signal storehouse, pushes back trip signal storehouse by remaining node；
Step 17: can node state table in the updated find and the joint of the node UNICOM ejected from isolated island node storehouse
Point, can, then go to step 18, otherwise go to step 19；
Step 18: assume total m node and the node UNICOM ejected from isolated island node storehouse, by m the node with UNICOM
Press-in isolated island node storehouse, simultaneously by isolated island node counter+m；Go to step 12；
Step 19: the node press-in output node storehouse that will eject from isolated island node storehouse；
Step 20: judge whether isolated island node counter is 0, if it is not, then go to step 12；The most then go to step 21；
Step 21: eject all nodes in output node storehouse, all nodes composition output node in output node storehouse
Set；
Step 22: judge the most simultaneously to contain in output node set power supply and load bus, if going to step 23；Turn step if not
Rapid 24；
Step 23: output node collection is combined into isolated island, goes to step 7；
Step 24: output node set is not isolated island, abandons this output node set, goes to step 7；
Step 25: for all isolated island nodes in each isolated island of output, in conjunction with node type table, carry out anti-isolated island protection
Cut machine operation.
Technical scheme has the advantages that
Technical scheme, for large-scale wind electricity generation system, at mains side high pressure major network, carries out isolated island detection and prevents
Isolated island is protected, and has quickly, accurately, efficiently, and safe and stable advantage.Technical solution of the present invention does not consider that circuit is weighed simultaneously
Weight, can carry out anti-isolated island protection act faster.
Below by drawings and Examples, technical scheme is described in further detail.
Accompanying drawing explanation
Fig. 1 is healthy phases voltage elevated view in the case of existing singlephase earth fault；
Fig. 2 is the method for detecting and protecting isolated island stream for large-scale wind power with anti-jump function described in the embodiment of the present invention
Cheng Tu；
Fig. 3 is the electrical network connection diagram described in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are illustrated, it will be appreciated that preferred reality described herein
Execute example be merely to illustrate and explain the present invention, be not intended to limit the present invention.
As in figure 2 it is shown, a kind of method for detecting and protecting isolated island for large-scale wind power with anti-jump function, including:
Initialize node type table and the step of node connection table；
Circuit breaker trip signal in monitoring electrical network, and according to the circuit breaker trip signal update node connection table of monitoring, simultaneously
Start the step of anti-theft mode hopping block；
And
According to the node connection table after updating, it may be judged whether form the step of isolated island.
Preferably, initialize node type table and the step of node connection table, particularly as follows:
Step 1, initialization node type table: set total n node in network, the generating set in network is initialized as 1, negative
Lotus node initializing is 2, and the root node in monitoring network is set to 3, and remaining node is set to 0, wherein, is initialized as the joint of 1 or 2
Point is fringe node, and the node being initialized as 0 is internal node；
Initialize node connection table: for comprising the network of n node, for any two node A and B, if A, B two is between node
Have 1 power circuit to connect and circuit is in connection status, then in table, A row B row put 1, have two to be then set to 2, if A, B two node
Between unregulated power connection or connection line be off, then in table, A row B row set to 0.
Preferably, the circuit breaker trip signal in monitoring electrical network, and according to the circuit breaker trip signal update node of monitoring
Connection table, starts the step of anti-theft mode hopping block simultaneously, specifically includes:
Step 2: the circuit breaker trip signal in monitoring electrical network, starts anti-theft mode hopping block simultaneously；
Step 3: whether find circuit breaker trip signal, if without trip signal, returns step 2, enters if monitoring trip signal
Step 4；
Step 4: more new node connection table, initializes output node storehouse, and empties output node storehouse；
Step 5: initialize trip signal storehouse, empty trip signal storehouse；Initialize trip signal counter, and will meter
Number device sets to 0；
Step 6: circuit breaker trip signal is pressed into one by one trip signal storehouse, and is jumped by trip signal number counter records
The number of lock signal.
Preferably, step 6 circuit breaker trip signal is pressed into trip signal storehouse one by one particularly as follows:
If the chopper connecting two nodes of A, B trips, if node A is more farther to the distance of root node than node B distance, then
By d(A, B) signal press-in trip signal storehouse, otherwise then by d(B, A) press-in trip signal storehouse.
Preferably, step 2 starts anti-theft mode hopping block, particularly as follows: start thread to carry out anti-jump detection, if it find that have
Node jump, employing interrupt mode process jump, and saving scene, preferred process jump event, after jump event handling completes,
Restoring scene, continues with anti-isolated island protection event.
Preferably, according to the node connection table after updating, it may be judged whether the step forming isolated island specifically includes:
Step 7: judge the trip signal in trip signal counter whether more than 0, no, go to step 2；It is to go to step 8；
Step 8: initialize isolated island node counter juxtaposition 0；
Step 9: initialize isolated island node storehouse, empty isolated island node storehouse；
Step 10: eject a trip signal, trip signal counter-1 from trip signal storehouse；
Step 11: by corresponding for the trip signal of above-mentioned ejection node press-in isolated island node storehouse, isolated island node counter+
1；
Step 12: eject a node, isolated island node counter-1 from isolated island node storehouse
Step 13: judge whether this node is root node according to the node state table after updating, if root node, go to step 14；
No, then go to step 15；
Step 14: empty isolated island node storehouse, empties isolated island node counter, goes to step 7；
Step 15: the node ejected from isolated island node storehouse is compared one by one with the node in trip signal storehouse whether phase
With, if it is different, and go to step 17；If having identical, then go to step 16；
Step 16: after rejecting this same node point from trip signal storehouse, pushes back trip signal storehouse by remaining node；
Step 17: can node state table in the updated find and the joint of the node UNICOM ejected from isolated island node storehouse
Point, can, then go to step 18, otherwise go to step 19；
Step 18: assume total m node and the node UNICOM ejected from isolated island node storehouse, by m the node with UNICOM
Press-in isolated island node storehouse, simultaneously by isolated island node counter+m；Go to step 12；
Step 19: the node press-in output node storehouse that will eject from isolated island node storehouse；
Step 20: judge whether isolated island node counter is 0, if it is not, then go to step 12；The most then go to step 21；
Step 21: eject all nodes in output node storehouse, all nodes composition output node in output node storehouse
Set；
Step 22: judge the most simultaneously to contain in output node set power supply and load bus, if going to step 23；Turn step if not
Rapid 24；
Step 23: output node collection is combined into isolated island, goes to step 7；
Step 24: output node set is not isolated island, abandons this output node set, goes to step 7；
Step 25: for all isolated island nodes in each isolated island of output, in conjunction with node type table, carry out anti-isolated island protection
Cut machine operation.
As it is shown on figure 3, connect for somewhere electrical network, its interior joint 1 becomes for 750kV Dunhuang, and node 2 becomes for 330kV Yumen,
Node 3 is 110kV Yumen town transformer station, and node 4 is that the traction of 110kV Yumen town becomes, and node 5 becomes for 110kV Yanguan Pass, and node 6 is
110kV Guazhou County gas pressure station, node 7 is 110kV Anxi oil transportation station, and node 8-10 is 3 feedbacks of Datang prosperous horse east 48MW wind energy turbine set
Line, node 11-14 is 4 feeder lines of clean source 71MW wind energy turbine set.
Connect in conjunction with above-mentioned electrical network, the method for the present invention be described as follows:
Step 1: initialize node type table
Altogether comprising 14 nodes in this network, node type table is as shown in table 1:
Table 1, node type table.
Node connection table is as shown in table 2:
Table 2, node connection table.
Step 2: the circuit breaker trip signal in monitoring electrical network, starts anti-theft mode hopping block simultaneously；System enters circulatory monitoring
Stage.
Step 3: whether find circuit breaker trip signal；At present, the open circuit of No. 3 node 110kV Yumen town transformer stations is monitored
Device, No. 5 node 110kV Yanguan Pass transformer breakers and No. 6 node 110kV Guazhou County compressor station two-wires find circuit breaker trip signal.
Step 4: more new node connection table, and initialize output node storehouse, and empty；Node connection table after renewal is such as
Shown in table 3:
Node connection table after table 3, renewal.
Step 5: initialize trip signal storehouse, empty storehouse；Initialize trip signal counter, and set to 0；
Step 6: circuit breaker trip signal is pressed into one by one trip signal storehouse, and records the number of trip signal；By d(3,2),
D(5,2) and d(6,5) press-in storehouse；Trip signal number is 3；
Step 7: judge that whether trip signal is more than 0, it is judged that result is more than 0；
Step 8: initialize isolated island node counter juxtaposition 0；
Step 9: initialize isolated island node storehouse, empty storehouse；
Step 10: eject a trip signal, trip signal counter-1 from trip signal storehouse；Now, eject d(6,
5), trip signal counter is 2；
Step 11: by node press-in isolated island node storehouse corresponding for this trip signal, isolated island node counter+1；Node 6
Press-in isolated island node storehouse, isolated island node counter is 1；
Step 12: eject a node, isolated island node counter-1 from isolated island node storehouse；Isolated island node storehouse is hit by a bullet
Egress 6, isolated island node counter is 0；
Step 13: judge whether this node is root node according to node state table？This node is not root node,
Step 15: compare the most identical one by one with the node in tripping operation node storehouse？Tripping operation node storehouse also have 2 nodes
With currently all differ；All nodes push back isolated island node storehouse again, and go to step 17；
Step 17: the node that can find with currently eject node UNICOM？No, go to step 19；
Step 19: this node is pressed into output node storehouse；
Step 20: whether isolated island node counter is 0？It is then to go to step 21；
Step 21: eject all nodes in " output node storehouse "；
Step 22: judge the most simultaneously to contain in output node set power supply and load bus, no, go to step 24；
Step 24: output node set is not isolated island, abandons this set, goes to step 7；
Step 7: judge that whether trip signal is more than 0, it is judged that result is more than 0；
Step 8: initialize isolated island node counter juxtaposition 0；
Step 9: initialize isolated island node storehouse, empty storehouse；
Step 10: eject a trip signal, trip signal counter-1 from trip signal storehouse；Now, eject d(5,
2), trip signal counter is 1；
Step 11: by node press-in isolated island node storehouse corresponding for this trip signal, isolated island node counter+1；Node 5
Press-in isolated island node storehouse, isolated island node counter is 1；
Step 12: eject a node, isolated island node counter-1 from isolated island node storehouse；Isolated island node storehouse is hit by a bullet
Egress 5, isolated island node counter is 0；
Step 13: judge whether this node is root node according to node state table？This node is not root node；
Step 15: compare the most identical one by one with the node in tripping operation node storehouse？Tripping operation node storehouse also has 1 node
With currently all differ；All nodes push back storehouse again, and go to step 17；
Step 17: the node that can find with currently eject node UNICOM？It is to go to step 18；
Step 18: node 7 and node 11-14 totally 5 node UNICOMs therewith, by the 5 node press-in storehouses with this node UNICOM, same
Time be 5 by isolated island node counter, go to step 12；
Step 12: ejecting a node from isolated island node storehouse, eject node 7, isolated island node counter is 4；
Step 13: judge whether this node is root node according to node state table？No, then go to step 15；
Step 15: compare the most identical one by one with the node in trip signal storehouse？With present node after node is ejected one by one
Comparing, different, the most all nodes push back trip signal storehouse again, and go to step 17；
Step 17: the node that can find with currently eject node UNICOM？Otherwise go to step 19；
Step 19: this node is pressed into output node storehouse；
Step 20: whether isolated island node counter is 0？No, then go to step 12；
Step 12: eject a node from isolated island node storehouse, eject node 11, isolated island node counter 3；
Step 13: judge whether this node is root node according to node state table？No, then go to step 15；
Step 15: compare the most identical one by one with the node in trip signal storehouse？With present node after node is ejected one by one
Comparing, different, the most all nodes push back storehouse again, and go to step 17；
Step 17: the node that can find with currently eject node UNICOM？Otherwise go to step 19；
Step 19: this node is pressed into output node storehouse；
Step 20: whether isolated island node counter is 0？No, then go to step 12；
Step 12: eject a node from isolated island node storehouse, eject node 12, isolated island node counter 2；
Step 13: judge whether this node is root node according to node state table？No, then go to step 15；
Step 15: compare the most identical one by one with the node in trip signal storehouse？With present node after node is ejected one by one
Comparing, different, the most all nodes push back storehouse again, and go to step 17；
Step 17: the node that can find with currently eject node UNICOM？Otherwise go to step 19；
Step 19: this node is pressed into output node storehouse；
Step 20: whether isolated island node counter is 0？No, then go to step 12；
Step 12: eject a node from isolated island node storehouse, eject node 13, isolated island node counter 1；
Step 13: judge whether this node is root node according to node state table？No, then go to step 15；
Step 15: compare the most identical one by one with the node in trip signal storehouse？With present node after node is ejected one by one
Comparing, different, the most all nodes push back storehouse again, and go to step 17；
Step 17: the node that can find with currently eject node UNICOM？Otherwise go to step 19；
Step 19: this node is pressed into output node storehouse；
Step 20: whether isolated island node counter is 0？No, then go to step 12；
Step 12: eject a node from isolated island node storehouse, eject node 14, isolated island node counter 0；
Step 13: judge whether this node is root node according to node state table？No, then go to step 15；
Step 15: compare the most identical one by one with the node in trip signal storehouse？With present node after node is ejected one by one
Comparing, different, the most all nodes push back storehouse again, and go to step 17；
Step 17: the node that can find with currently eject node UNICOM？Otherwise go to step 19；
Step 19: this node is pressed into output node storehouse；
Step 20: whether isolated island node counter is 0？It is then to go to step 21；
Step 21: eject all nodes in " output node storehouse "；
Step 22: judge to contain in output node set power supply and load bus the most simultaneously, be to go to step 23；
Step 23: output node set 7,11,12,13,14 is isolated island, goes to step 7；
Output node set 3,4,8,9,10 can be obtained for isolated island with same operating procedure.
This embodiment detects 2 isolated islands altogether.
Step 25: for all isolated island nodes in 2 each isolated islands of isolated island being detected, in conjunction with node type table, enter
Machine operation is cut in row anti-isolated island protection.
Anti-jump detection module by the detection voltage of circuit, electric current or electric signal, monitoring breaker whether jump, i.e.
Circuit breaker trip and do not signal to control centre, in the network system that anti-isolated island is protected, be equipped with anti-theft on every circuit
Jump detection module.
In above-described embodiment, anti-jump detection module is implemented to detect all of chopper, when open circuit being detected
During device tripping operation jump, anti-isolated island protection the most now proceeds to step 1 to which step in step 25, it is necessary under stopping
Come, preferably carry out jump event, after the jump node that the most anti-jump detection module detects, be transferred in above-mentioned steps 4 carry out
Process, until after having judged whether this jump node forms isolated island, returning again to original anti-isolated island and protect the step carried out.
Finally it is noted that the foregoing is only the preferred embodiments of the present invention, it is not limited to the present invention,
Although being described in detail the present invention with reference to previous embodiment, for a person skilled in the art, it still may be used
So that the technical scheme described in foregoing embodiments to be modified, or wherein portion of techniques feature is carried out equivalent.
All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included in the present invention's
Within protection domain.
Claims (6)
1. a method for detecting and protecting isolated island for large-scale wind power with anti-jump function, it is characterised in that including:
Initialize node type table and the step of node connection table；
Circuit breaker trip signal in monitoring electrical network, and according to the circuit breaker trip signal update node connection table of monitoring, simultaneously
Start the step of anti-theft mode hopping block；
And
According to the node connection table after updating, it may be judged whether form the step of isolated island.
The method for detecting and protecting isolated island for large-scale wind power with anti-jump function the most according to claim 1, its
It is characterised by, described initialization node type table and the step of node connection table, particularly as follows:
Step 1, initialization node type table: set total n node in network, the generating set in network is initialized as 1, negative
Lotus node initializing is 2, and the root node in monitoring network is set to 3, and remaining node is set to 0, wherein, is initialized as the joint of 1 or 2
Point is fringe node, and the node being initialized as 0 is internal node；
Initialize node connection table: for comprising the network of n node, for any two node A and B, if A, B two is between node
Have 1 power circuit to connect and circuit is in connection status, then in table, A row B row put 1, have two to be then set to 2, if A, B two node
Between unregulated power connection or connection line be off, then in table, A row B row set to 0.
The method for detecting and protecting isolated island for large-scale wind power with anti-jump function the most according to claim 2, its
It is characterised by, the circuit breaker trip signal in described monitoring electrical network, and connects according to the circuit breaker trip signal update node of monitoring
Connect table, start the step of anti-theft mode hopping block simultaneously, specifically include:
Step 2: the circuit breaker trip signal in monitoring electrical network, starts anti-theft mode hopping block simultaneously；
Step 3: whether find circuit breaker trip signal, if without trip signal, returns step 2, enters if monitoring trip signal
Step 4；
Step 4: more new node connection table, initializes output node storehouse, and empties output node storehouse；
Step 5: initialize trip signal storehouse, empty trip signal storehouse；Initialize trip signal counter, and will meter
Number device sets to 0；
Step 6: circuit breaker trip signal is pressed into one by one trip signal storehouse, and is jumped by trip signal number counter records
The number of lock signal.
The method for detecting and protecting isolated island for large-scale wind power with anti-jump function the most according to claim 3, its
Be characterised by, described step 6 circuit breaker trip signal is pressed into trip signal storehouse one by one particularly as follows:
If the chopper connecting two nodes of A, B trips, if node A is more farther to the distance of root node than node B distance, then
By d(A, B) signal press-in trip signal storehouse, otherwise then by d(B, A) press-in trip signal storehouse.
The method for detecting and protecting isolated island for large-scale wind power with anti-jump function the most according to claim 3, its
It is characterised by, described step 2 starts anti-theft mode hopping block, particularly as follows: start thread to carry out anti-jump detection, if it find that there is joint
Point jump, employing interrupt mode process jump, and saving scene, preferred process jump event, after jump event handling completes, extensive
Reproduction field, continues with anti-isolated island protection event.
The method for detecting and protecting isolated island for large-scale wind power with anti-jump function the most according to claim 4, its
It is characterised by, described according to the node connection table after updating, it may be judged whether the step forming isolated island specifically includes:
Step 7: judge the trip signal in trip signal counter whether more than 0, no, go to step 2；It is to go to step 8；
Step 8: initialize isolated island node counter juxtaposition 0；
Step 9: initialize isolated island node storehouse, empty isolated island node storehouse；
Step 10: eject a trip signal, trip signal counter-1 from trip signal storehouse；
Step 11: by corresponding for the trip signal of above-mentioned ejection node press-in isolated island node storehouse, isolated island node counter+
1；
Step 12: eject a node, isolated island node counter-1 from isolated island node storehouse
Step 13: judge whether this node is root node according to the node state table after updating, if root node, go to step 14；
No, then go to step 15；
Step 14: empty isolated island node storehouse, empties isolated island node counter, goes to step 7；
Step 15: the node ejected from isolated island node storehouse is compared one by one with the node in trip signal storehouse whether phase
With, if it is different, and go to step 17；If having identical, then go to step 16；
Step 16: after rejecting this same node point from trip signal storehouse, pushes back trip signal storehouse by remaining node；
Step 17: can node state table in the updated find and the joint of the node UNICOM ejected from isolated island node storehouse
Point, can, then go to step 18, otherwise go to step 19；
Step 18: assume total m node and the node UNICOM ejected from isolated island node storehouse, by m the node with UNICOM
Press-in isolated island node storehouse, simultaneously by isolated island node counter+m；Go to step 12；
Step 19: the node press-in output node storehouse that will eject from isolated island node storehouse；
Step 20: judge whether isolated island node counter is 0, if it is not, then go to step 12；The most then go to step 21；
Step 21: eject all nodes in output node storehouse, all nodes composition output node in output node storehouse
Set；
Step 22: judge the most simultaneously to contain in output node set power supply and load bus, if going to step 23；Turn step if not
Rapid 24；
Step 23: output node collection is combined into isolated island, goes to step 7；
Step 24: output node set is not isolated island, abandons this output node set, goes to step 7；
Step 25: for all isolated island nodes in each isolated island of output, in conjunction with node type table, carry out anti-isolated island protection
Cut machine operation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375520A (en) * | 2015-11-24 | 2016-03-02 | 国网甘肃省电力公司 | Island detection method for large-scale wind power with function of preventing tripping without fault |
| CN114744754A (en) * | 2022-03-15 | 2022-07-12 | 佳源科技股份有限公司 | Anti-islanding operation control system and control method applying low-voltage distribution area distributed photovoltaic access |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664391A (en) * | 2012-04-25 | 2012-09-12 | 广东电网公司珠海供电局 | Substation area island protection method and substation area island protection system |
| EP2645516A1 (en) * | 2012-03-30 | 2013-10-02 | ABB Technology AG | Islanding detection in electricity distribution network |
| CN103701122A (en) * | 2014-01-06 | 2014-04-02 | 华北电力大学 | Power grid topology analysis system based on incidence matrix and circuit matrix and method thereof |
| CN103971299A (en) * | 2014-05-26 | 2014-08-06 | 湖南大学 | Power distribution network island division method based on harmony algorithm |
| CN104810853A (en) * | 2015-05-08 | 2015-07-29 | 杭州沃瑞电力科技有限公司 | Digraph-based islanding method of distribution network including distributed generations |
-
2015
- 2015-11-24 CN CN201510822693.7A patent/CN105978017B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2645516A1 (en) * | 2012-03-30 | 2013-10-02 | ABB Technology AG | Islanding detection in electricity distribution network |
| CN102664391A (en) * | 2012-04-25 | 2012-09-12 | 广东电网公司珠海供电局 | Substation area island protection method and substation area island protection system |
| CN103701122A (en) * | 2014-01-06 | 2014-04-02 | 华北电力大学 | Power grid topology analysis system based on incidence matrix and circuit matrix and method thereof |
| CN103971299A (en) * | 2014-05-26 | 2014-08-06 | 湖南大学 | Power distribution network island division method based on harmony algorithm |
| CN104810853A (en) * | 2015-05-08 | 2015-07-29 | 杭州沃瑞电力科技有限公司 | Digraph-based islanding method of distribution network including distributed generations |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375520A (en) * | 2015-11-24 | 2016-03-02 | 国网甘肃省电力公司 | Island detection method for large-scale wind power with function of preventing tripping without fault |
| CN105375520B (en) * | 2015-11-24 | 2018-01-19 | 国网甘肃省电力公司 | There is the island detection method of anti-jump function for large-scale wind power |
| CN114744754A (en) * | 2022-03-15 | 2022-07-12 | 佳源科技股份有限公司 | Anti-islanding operation control system and control method applying low-voltage distribution area distributed photovoltaic access |
| CN114744754B (en) * | 2022-03-15 | 2024-04-26 | 佳源科技股份有限公司 | Island-preventing operation control system and method applying low-voltage transformer area distributed photovoltaic access |
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