CN105372529B - For the power grid isolated island detection of large-scale wind power and anti-isolated island guard method - Google Patents
For the power grid isolated island detection of large-scale wind power and anti-isolated island guard method Download PDFInfo
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Abstract
The invention discloses a kind of for the power grid isolated island detection of large-scale wind power and anti-isolated island guard method, comprising: the step of initializing node type table and node connection table；The circuit breaker trip signal in power grid is monitored, and according to the circuit breaker trip signal update node connection table of monitoring, and the step of node push-in queue that circuit breaker trip signal is corresponding；And logic judgment is carried out according to updated node connection table and queue, thus the step of judging the corresponding node of circuit breaker trip signal no formation isolated island.Isolated island detection and the protection of anti-isolated island are carried out, is had quickly in source side high pressure major network for large-scale wind electricity generation system, accurately, efficiently, safe and stable advantage.Technical solution of the present invention does not consider route weight simultaneously, can faster carry out anti-isolated island protection act.
Description
Technical field
The present invention relates to the anti-isolated islands of large-scale wind power generation to protect field, and in particular, to one kind is directed to large-scale wind power
Power grid isolated island detection and anti-isolated island guard method.
Background technique
Large Scale Wind Farm Integration (base) island state refers in Large Scale Wind Farm Integration (base) that part Wind turbines and major network are detached from
Afterwards, continue the operating status powered to its lower institute's on-load.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.Large-scale wind power accesses in the principle that isolated island causes and situation and distribution
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.Firstly, power quality is also uncontrollable after isolated island occurs for large-scale wind power access.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
Several: 1) under some failure situations, islanded system loses system earth；Blower generally by step-up transformer central point
Acquisition system zero point, when feeder fault, blower and feeder line lose system earth, and non-faulting phase voltage rises to 1.73 times of failure
Preceding phase voltage, principle are as shown in Figure 1.2) the distinctive fault characteristic of blower, fan converter are usually to carry out current control, wind
Machine is boosted by transformer step by step, and blower is also required to send electric energy to booster stations by longer current collection feeder line, is herein
There are biggish reactance in system, system impedance is big, and electromagnetic environment is complex, suddenly under power-off, can generate biggish transient state
Overvoltage.3) islanded system is time-dependent system, and its damping is smaller, can generate biggish transient overvoltage.If 4) in weight
When combined floodgate starts, system does not power off yet, it may appear that surge voltage, more serious situation are that non-synchronous reclosing occurs, at this moment, will
It will appear very big transient overvoltage.
Currently, common power distribution network island detection method is broadly divided into three classes: (1) passive detection method；(2) active detecting
Method；(3) based on the detection method of signal of communication.
Passive detection method monitors one or more power grid electrical quantity, according to electrical quantity and the direct deviation of set threshold value,
It can be determined that whether interest region occurs island operation state.It is general to pass through searching frequency, voltage or the abnormal number at phase angle
Multiple factor of judgment such as anomalous variation of harmonic wave in value or detection 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 itself just needs test side 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 be reduced.Its problem be non-detection region (Non-Detection Zone,
NDZ) it is possible to quite big, threshold threshold value is difficult to set, and has both been higher than value when normal operation, is less than value when isolated island again.
In order to reduce NDZ, the sensitivity of Chang Tigao device, but equipment fault-free trip can be caused, influence the normal operation of system；At certain
In a little specific situations, 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 effect.
Active detecting method is injecting voltage, frequency or phase angle in power grid, to cause network voltage, frequency or phase
The disturbance of parallactic angle, power distribution network when these disturbances are for grid-connected state, since the balance by major network is clamped down on, disturbing signal
It acts 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 response, to determine whether isolated island occurs.
The advantages of active detecting method, is that NDZ is smaller, and detection accuracy is higher, can accurately detect isolated island.The method
The shortcomings that be due to introducing disturbance quantity, cause grid power quality to decline and the unnecessary transient response of power grid；Control is calculated
Method is more complex, and practical application is difficult；Under different load characteristics, there are great differences for detection effect, even fails when serious.
State is cut-off based on what the detection method of signal of communication detected breaker using wired or wireless communication mode,
Determined whether that isolated island has occurred according to the variation of circuit-breaker status.
Detection method advantage based on signal of communication: detection zone (NDZ), detection are accurate and reliable nothing but；For single or more
The isolated island detection of a inverter is all effective；Its performance is unrelated with the type of DG device, will not make to the normal operation of power grid
It at interference, therefore is very reliable island detection method.This method disadvantage: needing to add equipment, and cost of implementation is high, and operation is multiple
It is miscellaneous, it needs much to authenticate, 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.Currently, existing power distribution network isolated island detection related patents be broadly divided into it is as follows
Several classes:
Passive detection method:
The patent of Patent No. 201510084241.3 proposes a kind of anti-isolated island protection of novel photovoltaic plant passive type
Method.The method is applied to large-scale photovoltaic power station and concentrates the substation that is connected to the grid, and passes through and calculates power frequency fault impedance and power
Factor variation, through impedance criterion and power factor criterion, it is individually load carrying small whether comprehensive descision photovoltaic plant occurs
Isolated island and photovoltaic plant and substation load carrying big isolated island together, once detecting isolated island, tripping is accordingly grid-connected immediately
Switch, to protect the safety of operating maintenance personnel and equipment.This method belongs to passive detection method, and is research pair with photovoltaic plant
As.
Active detecting method:
The patent of Patent No. 201410221942.2 provides a kind of Wind turbines isolated island test method.By an isolated island
Generating device is connected between Wind turbines outlet transformer and wind power plant step-up transformer, is made by adjusting isolated island generating device
Wind turbines are in island state, and detect Wind turbines grid entry point three-phase current, three-phase voltage and the grid-connected switch of Wind turbines
Status signal, investigates whether Wind turbines have island operating capacity, the off-grid time under Ji Fang isolated island.This method belongs to master
Dynamic detection 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 panel,
Telegraph key K and adjustable RLC load blocks composition can carry out island effect test to the large copacity power supplies class equipment such as photovoltaic plant.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 gives the injections such as its output power, frequency or phase certain disturbance, while detecting inverter by controlling gird-connected 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 is just
Understand accelerated accumulation and exceed allowed band, generates the protective device that a signal triggers grid-connected switch, make its tripping.This method pair
Low-voltage network 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 that parallel connection RLC load is accurately simulated with constant impedance load simulation unit, by grid-connected photovoltaic
The active power of inverter output is fed to power distribution network with unity power factor, it is ensured that it is inverse to trigger grid-connected photovoltaic during the test
Become 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 for detecting isolated island in low pressure (LV) electric power networks
The method of situation, this method for Multi- Switch signal network in, by detect network interruption road device position signal, and with it is true
Value table compares, and using the method tabled look-up, and the method by disconnecting power electrical unit protects system.This method needle
Isolated island detection is carried out to power distribution network, while this method uses the lower look-up table of efficiency.
The patent of Patent No. 201210124330.2 provides a kind of isolated island guard method of station domain and a kind of station domain isolated island
Protection system, by obtaining the location information of breaker relevant to island operation state is generated in substation region, judgement is
It is no island operation state occur, and isolated island protection act can be completed by a breaker at tripping electricity generation system networking.
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 protection, this method are not particularly suited for the anti-isolated island protection of large-scale wind electricity generation system, are since large-scale wind generates electricity
System, the electrical distance of each blower to wind power plant primary substation is longer, is asked using the overvoltage that this method will cause blower feeder line
Topic, to influence the service life of blower.
The patent of Patent No. 201310039649.X provides a kind of distributed generation grid-connected system anti-isolated island protection system
System and its guard method are based on carrier communication and decentralized detection technology, are carried out by the information that upper carrier terminal equipment obtains grid side
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 the reliability and safety of distributed generation grid-connected system.This method is directed to 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 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(feedback is installed on each switch
Line automation terminal), the status information of each switch of FTU real-time detection judges according to the folding condition of isolated island association switch
Whether isolated operation is occurred.For the distributed generation resource for judging to be in isolated operation, the FTU in the distributed generation resource exit is just
Ground issues the order of isolated island protection, this exit DG is switched and is disconnected, keeps its out of service.This method is directed to 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 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 by control the first breaker, realize isolated island determine and anti-isolated island defencive function, and by setting three-phase inversion
Device realizes the function of low voltage crossing, so that low voltage crossing and anti-isolated island defencive function be coexisted, has reached enhancing photovoltaic
The purpose of electric power station system stability and safety.This method carries out anti-isolated island protection for photovoltaic generating system, is not related to big
The anti-isolated island of scale land management formula wind-power electricity generation is protected.
The patent of Patent No. 201310560121.7 provides a kind of anti-isolated operation system of more plant-grid connection substations.
Judgement can fast and accurately be passed through for when line fault, main transformer failure and bus-bar fault occurring in 110kV substation region
The position of the switch cuts off grid-connected small power supply, avoids that isolated operation occurs, damages user's electrical equipment and system irregular operation.
This method carries out anti-isolated island protection for photovoltaic generating system, and the anti-isolated island for being not related to extensive centralized wind-power electricity generation is protected
Shield.
The patent of Patent No. 201320048498.X provides a kind of intelligence RLC load 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 simulation 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 related in Generation Side high pressure major network
Carry out isolated island detection.
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 in conjunction with 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 select the backup power automatic switching function of high, medium and low voltage side and the protection of anti-isolated island are by apparatus function pressing plate
No opening；By device software control setting high, medium and low voltage side for throwing mode, and with identify before high, medium and low voltage side member
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 just for substation's range, is not related to carry out isolated island inspection in large-scale wind electricity base
It surveys.
Paper " based on the distributed power generation isolated island division methods for improving Prim algorithm " is lonely for user side low-voltage network
Island problem proposes a kind of minimal spanning tree algorithm progress isolated island division based on prim method, and this method is not related to source side
High pressure major network carries out anti-isolated island detection, while because needing to consider route weight, therefore the delay of anti-isolated island protection act is larger.
Summary of the invention
It is an object of the present invention in view of the above-mentioned problems, propose a kind of power grid isolated island detection for large-scale wind power and
Anti- isolated island guard method, to realize quickly, accurately, and efficiently, safe and stable advantage.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of detection of power grid isolated island and anti-isolated island guard method for large-scale wind power, comprising:
The step of initializing node type table and node connection table；
The circuit breaker trip signal in power grid is monitored, and according to the circuit breaker trip signal update node connection table of monitoring,
And the step of corresponding node of circuit breaker trip signal is pushed into queue；
And
Logic judgment is carried out according to updated node connection table and queue, to judge that circuit breaker trip signal is corresponding
The step of node no formation isolated island.
Preferably, the initialization node type table and the step of node connection table, specifically:
Step 1, initialization node type table: it sets and shares n node in network, the generating set in network is initialized as
1, load bus is initialized as 2, the root node in monitoring network is set as 3, remaining node is set as 0, wherein be initialized as 1 or 2
Node be fringe node, be initialized as 0 node be internal node；
Initialize node connection table: for the network comprising n node, for any two node A and B, if two section of A, B
There is 1 power circuit connection between point and route is in connection status, then A row B column set 1 in table, there are two to be then set to 2, if A, B two
Unregulated power connection or connection line are in an off state between node, then A row B column set 0 in table.
Preferably, the circuit breaker trip signal in the monitoring power grid, and according to the circuit breaker trip signal update of monitoring
Node connection table, and the step of node push-in queue that circuit breaker trip signal is corresponding, specifically include:
Step 2: the circuit breaker trip signal in monitoring power grid；
Step 3: whether find circuit breaker trip signal, if without trip signal, return step 2, if monitoring trip signal
Enter step 4；
Step 4: more new node connection table initializes output node queue, and empties output node queue；
Step 5: initialization trip signal queue empties trip signal queue；Trip signal counter is initialized, and
Counter is set 0；
Step 6: circuit breaker trip signal being pushed into trip signal queue one by one, and is remembered by trip signal counter
Record the number of trip signal.
Preferably, circuit breaker trip signal is pushed into trip signal queue by the step 6 one by one specifically:
If the breaker of connection two nodes of A, B trips, if node A arrives the distance of root node more than node B distance
Far, then by d(A, B) signal be pushed into trip signal queue, on the contrary it is then by d(B, A) push-in trip signal queue.
Preferably, described that logic judgment is carried out according to updated node connection table and queue, to judge that breaker is jumped
The step of corresponding node of lock signal no formation isolated island, specifically includes:
Step 7: judge whether the trip signal in trip signal counter is greater than 0, it is no, go to step 2；It is to turn step
Rapid 8；
Step 8: initialization isolated island node number counter juxtaposition 0；
Step 9: initialization isolated island node queue empties isolated island node queue；
Step 10: a trip signal, trip signal counter -1 are taken out from trip signal queue；
Step 11: the corresponding node of the trip signal of above-mentioned taking-up is pushed into isolated island node queue, isolated island node number meter
Number device+1；
Step 12: a node, isolated island node number counter -1 are taken out from isolated island node queue
Step 13: judging whether the node is root node according to updated node state table, if root node, go to step
14；It is no, then go to step 15；
Step 14: emptying isolated island node queue, empty isolated island node number counter, go to step 7；
Step 15: by from the node taken out in isolated island node queue and the node in trip signal queue one by one compared with whether
It is identical, if it is different, and going to step 17；If having identical, 16 are gone to step；
Step 16: after rejecting the same node point in trip signal queue, remaining node being pushed into trip signal queue；
Step 17: can node state table in the updated find and the node connection taken out from isolated island node queue
Node, can, then 18 are gone to step, otherwise goes to step 19；
Step 18: assuming that shared m node and the node connection taken out from isolated island node queue, it will be a with the m of connection
Node is pushed into isolated island node queue, while by isolated island node number counter+m；Go to step 12；
Step 19: the node taken out from isolated island node queue is pushed into output node queue；
Step 20: judging whether isolated island node counter is 0, if it is not, then going to step 12；If so, going to step 21；
Step 21: taking out all nodes in output node queue, all nodes in output node queue form output
Node set；
Step 22: judging whether simultaneously containing power supply and load bus in output node set, if going to step 23；If not
Go to step 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 the output node set, goes to step 7；
Step 25: anti-isolated island is carried out in conjunction with node type table for all isolated island nodes in each isolated island of output
Machine operation is cut in protection.
Technical solution of the present invention has the advantages that
Technical solution of the present invention carries out isolated island detection in source side high pressure major network for large-scale wind electricity generation system
And anti-isolated island protection, have quickly, accurately, efficiently, safe and stable advantage.Technical solution of the present invention does not consider route simultaneously
Weight can faster carry out anti-isolated island protection act.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is non-faulting phase voltage elevated view in the case of existing singlephase earth fault；
Fig. 2 is described in the embodiment of the present invention for the power grid isolated island detection of large-scale wind power and anti-isolated island guard method stream
Cheng Tu；
Fig. 3 is power grid connection schematic diagram described in the embodiment of the present invention.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
As shown in Fig. 2, a kind of for the power grid isolated island detection of large-scale wind power and anti-isolated island guard method, comprising:
The step of initializing node type table and node connection table；
The circuit breaker trip signal in power grid is monitored, and according to the circuit breaker trip signal update node connection table of monitoring,
And the step of corresponding node of circuit breaker trip signal is pushed into queue；
And
Logic judgment is carried out according to updated node connection table and queue, to judge that circuit breaker trip signal is corresponding
The step of node no formation isolated island.
Preferably, the step of initializing node type table and node connection table, specifically:
Step 1, initialization node type table: it sets and shares n node in network, the generating set in network is initialized as
1, load bus is initialized as 2, the root node in monitoring network is set as 3, remaining node is set as 0, wherein be initialized as 1 or 2
Node be fringe node, be initialized as 0 node be internal node；
Initialize node connection table: for the network comprising n node, for any two node A and B, if two section of A, B
There is 1 power circuit connection between point and route is in connection status, then A row B column set 1 in table, there are two to be then set to 2, if A, B two
Unregulated power connection or connection line are in an off state between node, then A row B column set 0 in table.
Preferably, the circuit breaker trip signal in power grid is monitored, and according to the circuit breaker trip signal update node of monitoring
Connection table, and the step of node push-in queue that circuit breaker trip signal is corresponding, specifically include:
Step 2: the circuit breaker trip signal in monitoring power grid；
Step 3: whether find circuit breaker trip signal, if without trip signal, return step 2, if monitoring trip signal
Enter step 4；
Step 4: more new node connection table initializes output node queue, and empties output node queue；
Step 5: initialization trip signal queue empties trip signal queue；Trip signal counter is initialized, and
Counter is set 0；
Step 6: circuit breaker trip signal being pushed into trip signal queue one by one, and is remembered by trip signal counter
Record the number of trip signal.
Preferably, circuit breaker trip signal is pushed into trip signal queue by step 6 one by one specifically:
If the breaker of connection two nodes of A, B trips, if node A arrives the distance of root node more than node B distance
Far, then by d(A, B) signal be pushed into trip signal queue, on the contrary it is then by d(B, A) push-in trip signal queue.
Preferably, logic judgment is carried out according to updated node connection table and queue, to judge that circuit breaker trip is believed
The step of number corresponding node no formation isolated island, specifically includes:
Step 7: judge whether the trip signal in trip signal counter is greater than 0, it is no, go to step 2；It is to turn step
Rapid 8；
Step 8: initialization isolated island node number counter juxtaposition 0；
Step 9: initialization isolated island node queue empties isolated island node queue；
Step 10: a trip signal, trip signal counter -1 are taken out from trip signal queue；
Step 11: the corresponding node of the trip signal of above-mentioned taking-up is pushed into isolated island node queue, isolated island node number meter
Number device+1；
Step 12: a node, isolated island node number counter -1 are taken out from isolated island node queue
Step 13: judging whether the node is root node according to updated node state table, if root node, go to step
14；It is no, then go to step 15；
Step 14: emptying isolated island node queue, empty isolated island node number counter, go to step 7；
Step 15: by from the node taken out in isolated island node queue and the node in trip signal queue one by one compared with whether
It is identical, if it is different, and going to step 17；If having identical, 16 are gone to step；
Step 16: after rejecting the same node point in trip signal queue, remaining node being pushed into trip signal queue；
Step 17: can node state table in the updated find and the node connection taken out from isolated island node queue
Node, can, then 18 are gone to step, otherwise goes to step 19；
Step 18: assuming that shared m node and the node connection taken out from isolated island node queue, it will be a with the m of connection
Node is pushed into isolated island node queue, while by isolated island node number counter+m；Go to step 12；
Step 19: the node taken out from isolated island node queue is pushed into output node queue；
Step 20: judging whether isolated island node counter is 0, if it is not, then going to step 12；If so, going to step 21；
Step 21: taking out all nodes in output node queue, all nodes in output node queue form output
Node set；
Step 22: judging whether simultaneously containing power supply and load bus in output node set, if going to step 23；If not
Go to step 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 the output node set, goes to step 7；
Step 25: anti-isolated island is carried out in conjunction with node type table for all isolated island nodes in each isolated island of output
Machine operation is cut in protection.
As shown in figure 3, connecting for somewhere power grid, interior joint 1 is the change of the Dunhuang 750kV, and node 2 is the change of the Yumen 330kV,
Node 3 is the Yumen 110kV town substation, and node 4 is that the traction of the Yumen 110kV town becomes, and node 5 is the change of 110kV Yanguan Pass, and node 6 is
The Guazhou County 110kV gas pressure station, node 7 are the Anxi 110kV oil transportation station, and node 8-10 is 3 feedbacks of the prosperous horse east 48MW wind power plant of Datang
Line, node 11-14 are 4 feeder lines of clean source 71MW wind power plant.
It is connected in conjunction with above-mentioned power grid, method of the invention is described as follows:
Step 1: initialization node type table
In total include 14 nodes in the 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 power grid；System enters the circulatory monitoring stage.
Step 3: whether finding circuit breaker trip signal；Currently, monitoring No. 3 Yumen node 110kV town substation open circuits
Device, No. 5 node 110kV Yanguan Pass transformer breakers and No. 6 Guazhou County node 110kV compressor station two-wires find circuit breaker trip signal.
Step 4: more new node connection table, and output node queue is initialized, and empty；Updated node connection table is such as
Shown in table 3:
Table 3, updated node connection table.
Step 5: initialization trip signal queue empties queue；Initialize trip signal counter, juxtaposition 0；
Step 6: circuit breaker trip signal being pushed into trip signal queue one by one, and records the number of trip signal；By d
(3,2), d(5,2) and d(6,5) push-in queue；Trip signal number is 3；
Step 7: judging whether trip signal is greater than 0, judging result is greater than 0；
Step 8: initialization isolated island node number counter juxtaposition 0；
Step 9: initialization isolated island node queue empties queue；
Step 10: a trip signal, trip signal counter -1 are taken out from trip signal queue；At this point, taking out d
(6,5), trip signal counter are 2；
Step 11: the corresponding node of the trip signal is pushed into isolated island node queue, isolated island node number counter+1；Section
6 push-in isolated island node queue of point, isolated island node number counter is 1；
Step 12: a node, isolated island node number counter -1 are taken out from isolated island node queue；Isolated island node queue
Middle taking-up node 6, isolated island node number counter are 0；
Step 13: judging that the node is root node according to node state table? the node is not root node,
Step 15: with tripping node queue in node one by one compared with it is whether identical? there are also 2 in tripping node queue
Node be currently all different；All nodes are pushed into isolated island node queue again, and go to step 17；
Step 17: the node with currently taking-up node connection can be found? it is no, go to step 19；
Step 19: the node is pushed into output node queue；
Does is step 20: isolated island node counter 0? it is then to go to step 21；
Step 21: taking out all nodes in " output node queue "；
Step 22: judge whether simultaneously containing power supply and load bus in output node set, it is no, go to step 24；
Step 24: output node set is not isolated island, abandons the set, goes to step 7；
Step 7: judging whether trip signal is greater than 0, judging result is greater than 0；
Step 8: initialization isolated island node number counter juxtaposition 0；
Step 9: initialization isolated island node queue empties queue；
Step 10: a trip signal, trip signal counter -1 are taken out from trip signal queue；At this point, taking out d
(5,2), trip signal counter are 1；
Step 11: the corresponding node of the trip signal is pushed into isolated island node queue, isolated island node number counter+1；Section
5 push-in isolated island node queue of point, isolated island node number counter is 1；
Step 12: a node, isolated island node number counter -1 are taken out from isolated island node queue；Isolated island node queue
Middle taking-up node 5, isolated island node number counter are 0；
Step 13: judging that the node is root node according to node state table? the node is not root node；
Step 15: with tripping node queue in node one by one compared with it is whether identical? there are also 1 in tripping node queue
Node be currently all different；All nodes are pushed into queue again, and go to step 17；
Step 17: the node with currently taking-up node connection can be found? it is to go to step 18；
Step 18: node 7 and node 11-14 totally 5 nodes connection therewith will be pushed into team with 5 nodes of the node connection
Column, while being 5 by isolated island node number counter, go to step 12；
Step 12: taking out a node from isolated island node queue, take out node 7, isolated island node number counter is 4；
Step 13: judging that the node is root node according to node state table? it is no, then go to step 15；
Step 15: with the node in trip signal queue one by one compared with it is whether identical? after node is taken out one by one and currently
Node is compared, and different, then all nodes are pushed into trip signal queue again, and go to step 17；
Step 17: the node with currently taking-up node connection can be found? otherwise 19 are gone to step；
Step 19: the node is pushed into output node queue；
Does is step 20: isolated island node counter 0? it is no, then go to step 12；
Step 12: taking out a node from isolated island node queue, take out node 11, isolated island node number counter 3；
Step 13: judging that the node is root node according to node state table? it is no, then go to step 15；
Step 15: with the node in trip signal queue one by one compared with it is whether identical? after node is taken out one by one and currently
Node is compared, and different, then all nodes are pushed into queue again, and go to step 17；
Step 17: the node with currently taking-up node connection can be found? otherwise 19 are gone to step；
Step 19: the node is pushed into output node queue；
Does is step 20: isolated island node counter 0? it is no, then go to step 12；
Step 12: taking out a node from isolated island node queue, take out node 12, isolated island node number counter 2；
Step 13: judging that the node is root node according to node state table? it is no, then go to step 15；
Step 15: with the node in trip signal queue one by one compared with it is whether identical? after node is taken out one by one and currently
Node is compared, and different, then all nodes are pushed into queue again, and go to step 17；
Step 17: the node with currently taking-up node connection can be found? otherwise 19 are gone to step；
Step 19: the node is pushed into output node queue；
Does is step 20: isolated island node counter 0? it is no, then go to step 12；
Step 12: taking out a node from isolated island node queue, take out node 13, isolated island node number counter 1；
Step 13: judging that the node is root node according to node state table? it is no, then go to step 15；
Step 15: with the node in trip signal queue one by one compared with it is whether identical? after node is taken out one by one and currently
Node is compared, and different, then all nodes are pushed into queue again, and go to step 17；
Step 17: the node with currently taking-up node connection can be found? otherwise 19 are gone to step；
Step 19: the node is pushed into output node queue；
Does is step 20: isolated island node counter 0? it is no, then go to step 12；
Step 12: taking out a node from isolated island node queue, take out node 14, isolated island node number counter 0；
Step 13: judging that the node is root node according to node state table? it is no, then go to step 15；
Step 15: with the node in trip signal queue one by one compared with it is whether identical? after node is taken out one by one and currently
Node is compared, and different, then all nodes are pushed into queue again, and go to step 17；
Step 17: the node with currently taking-up node connection can be found? otherwise 19 are gone to step；
Step 19: the node is pushed into output node queue；
Does is step 20: isolated island node counter 0? it is then to go to step 21；
Step 21: taking out all nodes in " output node queue "；
Step 22: judging whether simultaneously containing power supply and load bus in output node set, be to go to step 23；
Step 23: output node set 7,11,12,13,14 is isolated island, goes to step 7；
It is isolated island with the available output node set 3,4,8,9,10 of same operating procedure.
2 isolated islands are detected in the embodiment altogether.
Step 25: for detecting all isolated island nodes in 2 isolated island each isolated islands, in conjunction with node type table, into
Machine operation is cut in the anti-isolated island protection of row.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it 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 the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (3)
1. a kind of for the power grid isolated island detection of large-scale wind power and anti-isolated island guard method characterized by comprising
The step of initializing node type table and node connection table；
The circuit breaker trip signal in power grid is monitored, and according to the circuit breaker trip signal update node connection table of monitoring, and will
The step of corresponding node of circuit breaker trip signal is pushed into queue；And
Logic judgment is carried out according to updated node connection table and queue, to judge the corresponding node of circuit breaker trip signal
Whether isolated island is formed；
Wherein, the circuit breaker trip signal in the monitoring power grid, and connected according to the circuit breaker trip signal update node of monitoring
Table is connect, and the corresponding node of circuit breaker trip signal is pushed into queue, comprising:
Step 2: the circuit breaker trip signal in monitoring power grid；
Step 3: circuit breaker trip signal whether is found, if return step 2, trip signal enters if monitoring without trip signal
Step 4；
Step 4: more new node connection table initializes output node queue, and empties output node queue；
Step 5: initialization trip signal queue empties trip signal queue；Trip signal counter is initialized, and will meter
Number device sets 0；
Step 6: circuit breaker trip signal being pushed into trip signal queue one by one, and is jumped by trip signal number counter records
The number of lock signal；
Wherein, described that logic judgment is carried out according to updated node connection table and queue, to judge circuit breaker trip signal
Whether corresponding node forms isolated island
Step 7: judge whether the trip signal in trip signal counter is greater than 0, it is no, go to step 2；It is to go to step 8；
Step 8: initialization isolated island node number counter juxtaposition 0；
Step 9: initialization isolated island node queue empties isolated island node queue；
Step 10: a trip signal, trip signal counter -1 are taken out from trip signal queue；
Step 11: the corresponding node of the trip signal of above-mentioned taking-up is pushed into isolated island node queue, isolated island node number counter+
1；
Step 12: a node, isolated island node number counter -1 are taken out from isolated island node queue；
Step 13: judging whether the node is root node according to updated node state table, if root node, go to step 14；
It is no, then go to step 15；
Step 14: emptying isolated island node queue, empty isolated island node number counter, go to step 7；
Step 15: by from the node taken out in isolated island node queue and the node in trip signal queue one by one compared with whether phase
Together, if it is different, and going to step 17；If having identical, 16 are gone to step；
Step 16: after rejecting the same node point in trip signal queue, remaining node being pushed into trip signal queue；
Step 17: can node state table in the updated find the section with the node connection taken out from isolated island node queue
Point, can, then 18 are gone to step, otherwise goes to step 19；
Step 18: assuming that shared m node and the node connection taken out from isolated island node queue, are pushed into isolated island for m node
Node queue, while by isolated island node number counter+m；Go to step 12；
Step 19: the node taken out from isolated island node queue is pushed into output node queue；
Step 20: judging whether isolated island node counter is 0, if it is not, then going to step 12；If so, going to step 21；
Step 21: taking out all nodes in output node queue, all nodes in output node queue form output node
Set；
Step 22: judging whether simultaneously containing power supply and load bus in output node set, if going to step 23；Turn to walk 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 the output node set, goes to step 7；
Step 25: all isolated island nodes in each isolated island exported for step 23 carry out anti-orphan in conjunction with node type table
Machine operation is cut in island protection.
2. according to claim 1 for the power grid isolated island detection of large-scale wind power and anti-isolated island guard method, feature
It is, the step of the initialization node type table and node connection table, specifically:
Step 1, initialization node type table: it sets and shares n node in network, the generating set in network is initialized as 1, bear
Lotus node initializing is 2, the root node in monitoring network is set as 3, remaining node is set as 0, wherein be initialized as 1 or 2 section
Point is fringe node, and the node for being initialized as 0 is internal node；
Initialize node connection table: for the network comprising n node, for any two node A and B, if between two node of A, B
There is 1 power circuit connection and route is in connection status, then A row B column set 1 in table, there are two to be then set to 2, if two node of A, B
Between unregulated power connection or connection line be in an off state, then A row B column set 0 in table.
3. according to claim 2 for the power grid isolated island detection of large-scale wind power and anti-isolated island guard method, feature
It is, circuit breaker trip signal is pushed into trip signal queue by the step 6 one by one specifically:
If the breaker of connection two nodes of A, B trips, if node A more farther than the distance of node B distance to root node,
By d (A, B) signal be pushed into trip signal queue, on the contrary it is then by d (B, A) push-in trip signal queue.
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| CN107465206B (en) * | 2017-07-11 | 2021-08-06 | 中国电力科学研究院 | Wind power plant anti-islanding identification method and system based on harmonic impedance matrix |
| CN109004749B (en) * | 2018-07-19 | 2022-02-15 | 上海交通大学 | Communication island detection method |
| CN114268094A (en) * | 2021-12-17 | 2022-04-01 | 国网湖南省电力有限公司 | Small power supply island operation identification and connection and disconnection method and device for automatic backup power switching device |
| CN114069717B (en) * | 2022-01-18 | 2022-04-08 | 国网上海能源互联网研究院有限公司 | Method and device for anti-islanding control of transformer area integrated with distributed photovoltaic |
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