CN110888021A - Power distribution network fault judgment method and device - Google Patents
Power distribution network fault judgment method and device Download PDFInfo
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The application provides a power distribution network fault judgment method and a device, after fault information is obtained, whether a fault node is the bottommost node of a power distribution network hierarchical topology model is determined, if not, whether each next layer node of the fault node is in fault is determined, if each next layer node is in fault, the previous layer node of the fault node is determined, other nodes of a topology layer where the fault node is located and included in the previous layer node are determined, whether each node in the other nodes is in fault is determined, if each node is in fault, the previous layer node is determined to be in fault, whether the previous layer node is the topmost layer node is determined, if the previous layer node is the topmost layer node is determined, fault judgment is finished, otherwise, the previous layer node is used as a new fault node, the steps are repeatedly executed until the upper layer boundary of the fault is determined, and the judgment of the power distribution network fault is finished, the method and the device have the advantages that faults occurring in the power distribution network are located quickly, and therefore fault first-aid repair efficiency is improved, and power supply speed can be recovered quickly.
Description
Technical Field
The application belongs to the technical field of fault judgment, and particularly relates to a power distribution network fault judgment method and device.
Background
The rapid development of the current social economy has higher and higher requirements on power supply reliability, and effective power distribution network fault judgment has important significance for improving fault first-aid repair efficiency and restoring power supply speed.
At present, fault judgment aiming at a low-voltage distribution network still mainly depends on manual experience, so that the accuracy is poor and the efficiency is low.
Disclosure of Invention
In view of this, an object of the present application is to provide a method and an apparatus for determining a fault of a power distribution network, which are used to solve the problems of poor accuracy and low efficiency of fault determination in the prior art.
The technical scheme is as follows:
the application provides a power distribution network fault judgment method, which comprises the following steps:
after the fault information is obtained, determining whether a fault node indicated by the fault information is a bottommost node in a pre-established power distribution network hierarchical topology model;
if the fault node indicated by the fault information is determined not to be the lowest node in a pre-established power distribution network hierarchical topology model, determining the next node of the fault node, and respectively determining whether the operation information of each next node is a fault;
if the operation information of each next layer node of the fault node is determined to be a fault, determining the operation information of the fault node to be a fault;
determining a node on the previous layer of the fault node, and determining other nodes which belong to the topology layer of the fault node and are included in the node on the previous layer;
respectively determining whether the operation information of each node in the other nodes is a fault;
if the operation information of each node in the other nodes is determined to be a fault, determining that the operation information of the previous layer node is the fault, and determining whether the previous layer node is the topmost node of the power distribution network hierarchical topology model;
if the previous layer node is determined not to be the topmost node of the power distribution network hierarchical topology model, taking the previous layer node as a new fault node, returning to the step of executing the previous layer node for determining the fault node and determining other nodes which belong to the topology layer of the fault node and are included by the previous layer node, and the subsequent steps;
and if the previous layer node is determined to be the topmost node of the power distribution network hierarchical topology model, ending the fault judgment.
Preferably, the method further comprises the following steps:
and if the fault node indicated by the fault information is determined to be the lowest node in the pre-established power distribution network hierarchical topology model, executing the step of determining the node on the previous layer of the fault node, and determining other nodes which belong to the topology layer where the fault node is located and are included in the node on the previous layer, and the subsequent steps.
Preferably, the method further comprises the following steps:
and if the operation information of at least one next layer node in the next layer node of the fault node is determined to be normal operation, determining that the operation information of the fault node is normal operation.
Preferably, the method further comprises the following steps:
and if the operation information of at least one node in the other nodes is determined to be normal operation, determining the operation information of the node on the upper layer to be normal operation, and finishing the fault judgment.
Preferably, the power distribution network layered topology model is a five-layer topology structure and comprises a feeder line main line layer, a feeder line branch line layer, a distribution and transformation layer, a low-voltage line layer and a user layer in sequence from a top layer to a bottom layer; the feeder line trunk layer comprises feeder line trunk nodes, the feeder line branch layer comprises feeder line branch line nodes, the distribution and transformation layer comprises distribution and transformation nodes, the low-voltage line layer comprises low-voltage line nodes, and the user layer comprises user nodes.
Preferably, the fault information includes at least one of:
the power failure alarm information of the user node, the power failure alarm information of the low-voltage line node, the power failure alarm information of the distribution and transformation node, the power failure alarm information of the feeder line main line node and the power failure alarm information of the feeder line branch line node.
The application discloses distribution network fault judges device includes:
the first determining unit is used for determining whether a fault node indicated by the fault information is a lowest node in a pre-established power distribution network hierarchical topology model after the fault information is acquired; if the fault node indicated by the fault information is determined not to be the lowest node in a pre-established power distribution network hierarchical topology model, determining the next node of the fault node, and respectively determining whether the operation information of each next node is a fault; if the operation information of each next layer node of the fault node is determined to be a fault, determining the operation information of the fault node to be a fault;
a second determining unit, configured to determine a node on a previous layer of the failed node, and determine other nodes included in the node on the previous layer and belonging to a topology layer where the failed node is located; respectively determining whether the operation information of each node in the other nodes is a fault; if the operation information of each node in the other nodes is determined to be a fault, determining the operation information of the node at the previous layer as the fault;
a third determining unit, configured to determine whether the previous-layer node is a topmost node of the hierarchical topology model of the power distribution network; if the previous layer node is determined not to be the topmost node of the power distribution network hierarchical topology model, taking the previous layer node as a new fault node, and calling the second determination unit; and if the previous layer node is determined to be the topmost node of the power distribution network hierarchical topology model, ending the fault judgment.
Preferably, the first determining unit is further configured to invoke the second determining unit if it is determined that the fault node indicated by the fault information is a lowest node in a pre-established hierarchical topology model of the power distribution network.
Preferably, the first determining unit is further configured to determine that the operation information of the failed node is normal operation if it is determined that the operation information of at least one next-layer node in the next-layer nodes of the failed node is normal operation.
Preferably, the second determining unit is further configured to determine that the operation information of the node on the previous layer is in normal operation and end the fault determination if it is determined that the operation information of at least one node in the other nodes is in normal operation.
Compared with the prior art, the technical scheme provided by the invention has the following advantages:
according to the technical scheme, after the fault information is acquired, whether the fault node indicated by the fault information is the bottommost node in the pre-established power distribution network hierarchical topology model is determined, if the fault node indicated by the fault information is determined not to be the bottommost node in the pre-established power distribution network hierarchical topology model, whether the operation information of each next-layer node of the fault node is a fault is determined, and if the operation information of each next-layer node of the fault node is determined to be a fault, the operation information of the fault node is determined to be a fault; then determining the previous layer node of the fault node, determining other nodes which belong to the topology layer of the fault node and are included in the previous layer node, respectively determining whether the operation information of each node in the other nodes is a fault, if determining that the operation information of each node in the other nodes is a fault, determining that the operation information of the previous layer node is a fault, determining whether the previous layer node is the topmost layer node of the power distribution network hierarchical topology model, if determining that the previous layer node is the topmost layer node of the power distribution network hierarchical topology model, finishing fault judgment, otherwise, taking the previous layer node as a new fault node, and repeatedly executing the previous layer node of the fault node and subsequent steps until the upper layer boundary of the fault is determined, further finishing the judgment of the fault of the power distribution network, so as to quickly locate the position of the fault in the power distribution network, thereby improving the efficiency of fault emergency repair and rapidly recovering the power supply speed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a power distribution network fault determination method disclosed in the present application;
FIG. 2 is a schematic diagram of a structure of a hierarchical topology model of a power distribution network established according to the present disclosure;
fig. 3 is a schematic structural diagram of a power distribution network fault determination device disclosed in the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The application provides a power distribution network fault judgment method, and as shown in fig. 1, the method may include the following steps:
s101, after fault information is obtained, whether a fault node indicated by the fault information is a bottommost node in a pre-established power distribution network hierarchical topology model or not is determined;
if the fault node indicated by the fault information is determined not to be the lowest node in the pre-established hierarchical topology model of the power distribution network, executing the step S102;
and if the fault node indicated by the fault information is determined to be the lowest node in the pre-established power distribution network hierarchical topology model, skipping to execute the step S104.
The power distribution network fault is divided into 5 types of power loss of a client, power loss of a low-voltage line, power loss of a distribution transformer, power loss of a branch line and power loss of a main line.
In order to accurately realize the grading and layering judgment of the distribution network faults, a distribution network layering topology model is pre-established. The network topology relation is determined based on dynamic topology analysis of the CIM, and then a power distribution network layered topology model is established.
Referring to fig. 2, the power distribution network hierarchical topology model established in the present application is a hierarchical star-structured network, which is divided into five levels, and each level is a node radiated by using a node in the previous level as a father node. Therefore, for the radial power distribution network, the established power distribution network layered topology model is a layered star-structured network.
The topmost node of the power distribution network hierarchical topology model represents a feeder main line, and the feeder main line is defined as a set F ═ (F)1，f2，…，fn) Meaning that each element in set F corresponds to a feeder trunk, only one feeder trunk F is shown in fig. 2i。
The feeder branch line is a part of the feeder trunk line, so that the feeder branch line is a next layer node of the feeder trunk line, wherein the element is the feeder branch line corresponding to the feeder trunk line, and the set B is (B)1，b2，...，bn) And (4) showing. Each element in set B corresponds to a feeder branch, and fig. 2 shows 5 feeder branches, B1, B2, B3, B4, B5 respectively. The next layer node of the feeder branch line is a distribution transformer, and the set T is equal to (T)1，t2，…，tn) It is shown that each element in the set T corresponds to a transformation, which refers to a device, such as a transformer, that converts high voltage electricity to low voltage electricity.
After the distribution transformer, low-voltage electricity can be transmitted to customer premise equipment for use through a low-voltage line, so that the next layer of nodes of the distribution transformer are low-voltage lines, and the set L (L) is used as a set1，l2，…，ln) It is shown that each element in the set L corresponds to a low voltage line. Each low-voltage line can be firstly connected with a plurality of user side equipment, such as household equipment. The next node of the low-voltage line is then the user, and the set C ═ C is used as the user1，c，…，cn) Meaning that each element in the set C corresponds to a user.
Each upper node corresponds to a set of all child nodes of a layer below the upper node; each group of child node sets corresponds to an upper node of the previous layer.
For all nodes constituting each topology layer, a running information vector P ═ (P) is defined1，p2，...，pn)TAnd n is the total number of nodes included in the topology layer, and Pi is operation information corresponding to the ith node in the topology layer, wherein the operation information includes normal operation and a fault, if the operation information is normal operation, Pi is 1, and if the operation information is a fault, Pi is 0.
For example, taking the penultimate topology layer in fig. 2, which is a low-voltage line and includes 3 nodes in total, the operation information vector P of all nodes in the topology layer is (P1, P2, P3)TIf the operation information corresponding to the l1 node is normal operation, that is, if the low-voltage line corresponding to the l1 node is normal operation, p1 is 1; if the operation information corresponding to the node l1 is a fault, that is, if the low-voltage line corresponding to the node l1 is a fault, p1 is equal to 0, and so on.
If the operation information corresponding to any node in the hierarchical topology model of the power distribution network shown in fig. 2 is a fault, fault information is generated, and the generated fault information can indicate that the operation information is the node with the fault.
After the power distribution network system acquires the fault information, the operation of power distribution network fault judgment based on the power distribution network layered topology model shown in fig. 2 is triggered to quickly locate the position of the fault in the power distribution network, so that the fault first-aid repair efficiency is improved, and the power supply speed can be quickly recovered.
After the power distribution network system acquires the fault information, the acquired fault information is verified to determine whether the fault information is effective.
The specific way of verifying the acquired fault information is to determine whether the operation information of the fault node is really a fault based on the operation information of the node on the next layer of the node (hereinafter referred to as the fault node) whose operation information indicated by the fault information is a fault.
In order to verify the acquired fault information, after the fault information is acquired, whether a fault node indicated by the fault information is the lowest node in a power distribution network hierarchical topology model is determined.
If the fault node is not the bottommost node, it is determined that the fault node has a next-layer node, and then it may be determined whether the operation information of the fault node is really a fault according to the operation information of the next-layer node, so as to execute step S102;
if the fault node is the bottommost node, it is indicated that the fault node does not have a next-layer node, the step of verifying the acquired fault information according to the operation information of the next-layer node is skipped, and the step S103 is skipped.
S102, determining the next layer node of the fault node, and respectively determining whether the operation information of each next layer node is a fault;
if the operation information of each next-layer node of the fault node is determined to be a fault, executing the step S103;
if it is determined that the operation information of at least one next-layer node in the next-layer nodes of the failed node is normal operation, step S108 is executed.
The fault information of the fault node can be verified through the relationship between the upper and lower nodes. Taking the failed node l3 in fig. 2 as an example, the failure information indicating the failed node is Pgk. The set of all next level nodes of the failed node is C ═ (C1, C2, C3), where each element in the set C is one next level node of the failed node l3, and each element has a value of 1. But may be any natural number other than 0. The running information vector P of the set C is (P1, P2, P3)TThe first element P1 in the set P is the operation information of the next-level node c1 of the failed node l3, the second element P2 is the operation information of the next-level node c2 of the failed node l3, and the third element P3 is the operation information of the next-level node c3 of the failed node l 3.
According toFormula (1) verification of Pgk。
In the formula (1), if the product of the two vectors is 0, it indicates that the value of each element in the operation information vector P is 0, and thus the operation information of each node on the next layer of the failed node is a failure, it is determined that the operation information of the failed node is a failure, and the representation passes verification. The failed node in the power distribution network system may then be located by performing steps S104-S109.
In the formula (1), if the product of the two vectors is not 0, it indicates that the value of at least one element in the operation information vector P is not 0, and thus the operation information of at least one next-layer node in the next-layer node of the failed node is normal operation, it is determined that the operation information of the failed node is normal operation, and the characterization fails to be verified. It jumps to step S110.
It should be noted that, when the failed node is another node, the set of the next-layer node of the failed node in the formula (1) changes, and the running information vector of the set of the next-layer node also changes, and the formula for verifying each node is not described again here.
S103, determining that the operation information of the fault node is a fault.
S104, determining a previous layer node of the fault node, and determining other nodes which belong to the topology layer of the fault node and are included in the previous layer node, wherein the previous layer node can be used as a parent node;
after the failure node indicated by the failure information passes verification, the upper layer boundary of the failure needs to be traced. In this embodiment, the node of the layer above the failed node is determined. And determines other nodes included in a node (parent node) on the previous layer of the failed node, which are on the same topology layer as the failed node.
Still taking the failed node as l3 as an example, the previous node of l3 is determined to be t1, i.e., t1 is the parent node of l 3.
t1 is the parent node of l3, and t1 further includes l1 and l2, wherein l1, l2 and l3 are all in the topological layer of low-voltage lines.
S105, respectively determining whether the operation information of each node in the other nodes is a fault;
if the operation information of each node in the other nodes is determined to be a fault, executing step S106;
and if the operation information of at least one node in the other nodes is determined to be normal operation, determining that the operation information of the node on the upper layer is normal operation, and further indicating that the node on the upper layer of the fault node is not in fault, determining that the fault node is the upper layer boundary of the fault, finishing the fault judgment of the power distribution network, and finishing the fault judgment process.
In another embodiment, a failure determination result may be output, where the failure determination result includes a node whose operation information is a failure. The user can quickly locate the fault based on the fault judgment result and the power distribution network layered topology model, and the fault first-aid repair efficiency and the power supply speed are quickly recovered.
One way to determine whether the operational information of each of the other nodes is a failure is to: and sequentially judging whether the operation information of each node is a fault.
Another way to determine whether the operational information of each of the other nodes is a failure is:
based on the same principle as formula 1, a set of all the other nodes is determined, the set is used as a first vector, then a running information vector of the set is determined, the determined running information vector is used as a second vector, and the product of the first vector and the second vector is calculated. If the product of the two vectors is 0, the operation information of each node is a fault, and if the product of the two vectors is not 0, the operation information of at least one node is normal operation.
Based on the example of step S104, the other nodes determined are l1 and l 2.
If the operation information of l1 is a fault, and the operation information of l2 is also a fault, the operation information of l3 is already a fault, so the operation information of t1 of the parent nodes of l1, l2 and l3 is also a fault; if the operation information of any one or more of the three nodes l1, l2 and l3 is normal operation, the operation information of the parent node t1 of the three nodes l1, l2 and l3 is normal operation.
S106, determining that the operation information of the previous layer node is a fault, and determining whether the previous layer node is the topmost layer node of the layered topology model of the power distribution network;
if the previous layer node is determined to be the topmost node of the power distribution network layered topology model, executing step S107;
if the previous layer node is determined not to be the topmost node of the layered topology model of the power distribution network, whether the operation information of the previous layer node of the father node is a fault needs to be continuously determined, and then the upper layer boundary of the fault needs to be continuously traced. Thereby taking the upper node as a failure node, and returning to execute step S104;
after the operation information of a t1 which is a node (parent node) at the upper layer of three nodes of l1, l2 and l3 is determined to be a fault, whether the t1 is the topmost node of the power distribution network hierarchical topology model is determined.
And if t1 is determined not to be the topmost node of the power distribution network hierarchical topology model, taking t1 as a fault node, returning to execute the step S104, determining that the node at the upper layer of t1 is b1, and determining that t2 and t3 are further included in b1, wherein t1, t2 and t3 are all in the distribution and transformation topology layer. It is determined whether the operation information of t2 and t3 are both failures.
If the operation information of any one or more of the three nodes t1, t2 and t3 is normal operation, the operation information of the node b1 at the upper layer of the three nodes t1, t2 and t3 is normal operation. And then the fault node t1 is the upper layer boundary of the fault, the power distribution network fault judgment is completed, and the fault judgment process is ended.
If it is determined that the operation information of t2 and t3 are both a fault and the operation information of t1 has been determined to be a fault, it is determined that the operation information of b1 is a fault.
After the operation information of b1 is determined to be a fault, determining whether b1 is the topmost node of the power distribution network hierarchical topology model; and if b1 is determined not to be the topmost node of the power distribution network hierarchical topology model, b1 is taken as a fault node, and the step S104 is executed in a returning mode. The upper boundary of the fault can be determined by repeatedly performing steps S104-S106.
And S107, finishing the fault judgment.
And determining the topmost node of the power distribution network hierarchical topology model as an upper layer boundary of the fault, and ending the power distribution network fault judgment process.
In another embodiment, a failure determination result may be output.
And S108, determining that the operation information of the fault node is normal operation.
In another embodiment, it is determined that the operation information of the failed node is normal operation, and it may be determined that there may be a node whose operation information is a failure in a node of a lower layer of the failed node.
Through the technical scheme, after the fault information is acquired, whether the fault node indicated by the fault information is the bottommost node in the pre-established power distribution network hierarchical topology model is determined, if the fault node indicated by the fault information is determined not to be the bottommost node in the pre-established power distribution network hierarchical topology model, whether the operation information of each next-layer node of the fault node is a fault is determined, and if the operation information of each next-layer node of the fault node is determined to be a fault, the operation information of the fault node is determined to be a fault; then determining the previous layer node of the fault node, determining other nodes which belong to the topology layer of the fault node and are included in the previous layer node, respectively determining whether the operation information of each node in the other nodes is a fault, if determining that the operation information of each node in the other nodes is a fault, determining that the operation information of the previous layer node is a fault, determining whether the previous layer node is the topmost layer node of the power distribution network hierarchical topology model, if determining that the previous layer node is the topmost layer node of the power distribution network hierarchical topology model, finishing fault judgment, otherwise, taking the previous layer node as a new fault node, and repeatedly executing the previous layer node of the fault node and subsequent steps until the upper layer boundary of the fault is determined, further finishing the judgment of the fault of the power distribution network, so as to quickly locate the position of the fault in the power distribution network, thereby improving the efficiency of fault emergency repair and rapidly recovering the power supply speed.
The fault information in the present application may include at least one of:
the power failure alarm information of the user node, the power failure alarm information of the low-voltage line node, the power failure alarm information of the distribution and transformation node, the power failure alarm information of the feeder line main line node and the power failure alarm information of the feeder line branch line node.
And the power distribution network fault judgment processes triggered by different fault information are different. If a plurality of fault information are received in the same time period, based on the power distribution network layered topology model shown in fig. 2, starting from a feeder main line node, judging according to the sequence of the power failure alarm information of the feeder main line node, the power failure alarm information of a feeder branch line node, the power failure alarm information of a distribution transformation node, the power failure alarm information of a low-voltage line node and the power failure alarm information of a user node.
Specifically, the judgment process of the power failure alarm information for the user node, the power failure alarm information for the low-voltage line node and the power failure alarm information for the distribution transformer node is as follows:
the method comprises the steps that power failure alarm information of a user node, power failure alarm information of a low-voltage line node or power failure alarm information of a distribution transformer node is obtained through a power utilization information acquisition system, or after a power failure judgment condition triggering the user node, a power failure judgment condition triggering the low-voltage line node or a power failure judgment condition triggering the distribution transformer node is obtained, the accuracy of the power failure information of the fault node is verified according to operation information of a lower-layer node of the fault node indicated by the power failure alarm information, namely whether the fault node is really power failure or not is verified. The principle on which the verification is based is: for a node, if the node loses power, all the next-layer nodes of the node lose power completely, so that the way of verifying whether the fault node really loses power is to verify whether all the next-layer nodes of the fault node lose power. Only if all the nodes of the next layer of the fault node lose power, the fault node loses power; otherwise the failed node is not powered down.
And after the power failure of the fault node is verified, whether the power failure of the upper node of the fault node exists is traced according to the upper layer relation of the fault node, and the upper layer boundary of the power failure fault is judged according to the operation information of the upper node. For example, for the power loss of the low-voltage line node, taking the l3 node as an example, the fault information indicating the fault node is Pgk. The set of all next level nodes of the failed node is C ═ (C1, C2, C3), where each element in the set C is one next level node of the failed node l3, and each element has a value of 1. But may be any natural number other than 0. The running information vector P of the set C is (P1, P2, P3)TThe first element P1 in the set P is the operation information of the next-level node c1 of the failed node l3, the second element P2 is the operation information of the next-level node c2 of the failed node l3, and the third element P3 is the operation information of the next-level node c3 of the failed node l 3.
If PgkNot equal to 0, verifying that the low-voltage line node l3 is not powered off, and if P is not powered offgkIf 0, the low voltage line node l3 is verified to be powered down. And determines the node on the upper layer of l3 and determines whether the node on the upper layer of l3 fails based on the principle of determining whether l3 loses power. If the node on the upper layer of l3 is determined to be in fault, determining that the node is in fault; if it is determined that the node on the upper layer of l3 does not fail, then a low-voltage line fault is determined.
The judgment process of the power-off alarm information aiming at the feeder branch line node and the power-off alarm information aiming at the feeder main line node is as follows:
and acquiring power-loss alarm information of feeder branch line nodes or power-loss alarm information of feeder main line nodes by combining switch displacement information in a dispatching automation system and a power distribution network layered topology model.
The switch in the power distribution automation system consists of an outgoing line switch [ CB ], a section switch [ SS ] and a connection switch [ SL ], wherein, 1 represents that the switch is closed, and 0 represents that the switch is opened. The outgoing switch [ CB ], the section switch [ SS ] and the interconnection switch [ SL ] have different switch states, and distribution subnets with different topological structures can be formed.
In a normal power supply state, the outgoing switch [ CBl ] ≡ 1, the sectional switch [ SSm ] ≡ 1 and the interconnection switch [ SLn ] ≡ 0 form a power distribution network layered topology structure of the power distribution sub-network shown in the figure 2.
Section Switch (SS)]Interconnection Switch (SL)]Has two current directions, S is usedi1＝[bX，bY]Representing the node b of a current branch line of a feeder line in a layered topology model of a power distribution networkXFlow direction feeder branch line node bY，Si2＝[bY，bX]Representing current flow from feeder branch node bYFlow direction feeder branch line node bX. Wherein, bXAnd bYRespectively corresponding to the nodes of the feeder branch line layer in the topology shown in fig. 2.
After receiving the power loss alarm information of the feeder branch line node or triggering the power loss judgment condition of the feeder branch line node, updating the relationship among the nodes in the power distribution network hierarchical topology model according to the following steps, and acquiring the operation information of the feeder branch line node.
1) Reading switch [ CB ] in layered topology model of power distribution network]、[SS]、[SL]State information of (2); in addition, TP ═ x1,x2,x3,…]；xiAnd is "1" or "0" depending on the switch state.
2) Traverse all outgoing switches [ CB ]]If the ith feeder trunk node fiCorresponding feeder main line outgoing switch [ CB ]i]1 is ═ 1; then its corresponding feeder branch line first node operation information pbiAnd 1 is 1. The operation information of the j +1 th child node of the branch line layer can be obtained by the following formula (1).
In the formula, SSm1＝[bi,j,bi,j+1]Indicating switch [ SSm]Said connection point is bi,jAnd bi,j+1。
3) Traverse all the coupletsComplexing Switch (SL)]In an operating state of [ SL ]k]1, [ SL ]k]Two feeder branch lines b connectedmX、bnYAny one of pbmX1, then pbnY1, then communicate with switch SLk]As a power supply point, a feeder branch line b is branched according to a formula (1)nYAll feeder branch lines with 0 operation information in the main line of the feeder line update the operation information, and corresponding section switches [ SS ] are used for updating]And exchanging the positions of the head node and the tail node.
After power-off alarm information of the feeder line main line node or a switch power-off judgment condition of the trigger feeder line main line node is obtained, the operation state [ CB ] of a wire outlet switch is obtained according to the operation state of the wire outlet switchj]And the feeder trunk line fjFeeder branch line corresponding to node and distribution and transformation layer node Bj、TjFault information vector P ofBjAnd PTiRespectively calculating the feeder branch line node BjWith its fault information vector PBjThe product of (2) is calculated to be a distribution transformation layer node TjWith its fault information vector PTiProduct of, if pfj0 and [ CBj]And if the voltage is equal to 0, judging that the feeder main line has a fault (power loss).
Corresponding to the power distribution network fault judgment method disclosed in the foregoing embodiment, the present application embodiment further provides a power distribution network fault judgment device, as shown in fig. 3, the device includes:
a first determining unit 301, a second determining unit 302 and a third determining unit 303.
A first determining unit 301, configured to determine, after obtaining the fault information, whether a fault node indicated by the fault information is a lowest node in a pre-established hierarchical topology model of the power distribution network; if the fault node indicated by the fault information is determined not to be the lowest node in a pre-established power distribution network hierarchical topology model, determining the next node of the fault node, and respectively determining whether the operation information of each next node is a fault; if the operation information of each next layer node of the fault node is determined to be a fault, determining the operation information of the fault node to be a fault;
a second determining unit 302, configured to determine a node on a layer above the failed node, and determine other nodes included in the node on the layer above the failed node and belonging to a topology layer where the failed node is located; respectively determining whether the operation information of each node in the other nodes is a fault; if the operation information of each node in the other nodes is determined to be a fault, determining the operation information of the node at the previous layer as the fault;
a third determining unit 303, configured to determine whether the previous node is a topmost node of the hierarchical topology model of the power distribution network; if the previous layer node is determined not to be the topmost node of the power distribution network hierarchical topology model, taking the previous layer node as a new fault node, and calling the second determination unit; and if the previous layer node is determined to be the topmost node of the power distribution network hierarchical topology model, ending the fault judgment.
Through the technical scheme, after the fault information is acquired, whether the fault node indicated by the fault information is the bottommost node in the pre-established power distribution network hierarchical topology model is determined, if the fault node indicated by the fault information is determined not to be the bottommost node in the pre-established power distribution network hierarchical topology model, whether the operation information of each next-layer node of the fault node is a fault is determined, and if the operation information of each next-layer node of the fault node is determined to be a fault, the operation information of the fault node is determined to be a fault; then determining the previous layer node of the fault node, determining other nodes which belong to the topology layer of the fault node and are included in the previous layer node, respectively determining whether the operation information of each node in the other nodes is a fault, if determining that the operation information of each node in the other nodes is a fault, determining that the operation information of the previous layer node is a fault, determining whether the previous layer node is the topmost layer node of the power distribution network hierarchical topology model, if determining that the previous layer node is the topmost layer node of the power distribution network hierarchical topology model, finishing fault judgment, otherwise, taking the previous layer node as a new fault node, and repeatedly executing the previous layer node of the fault node and subsequent steps until the upper layer boundary of the fault is determined, further finishing the judgment of the fault of the power distribution network, so as to quickly locate the position of the fault in the power distribution network, thereby improving the efficiency of fault emergency repair and rapidly recovering the power supply speed.
In another embodiment, the first determining unit 301 is further configured to invoke the second determining unit if it is determined that the fault node indicated by the fault information is the lowest node in the pre-established hierarchical topology model of the power distribution network.
The first determining unit 301 is further configured to determine that the operation information of the failed node is normal operation if it is determined that the operation information of at least one next-layer node in the next-layer nodes of the failed node is normal operation.
The second determining unit 302 is further configured to determine that the operation information of the node on the previous layer is normal operation if it is determined that the operation information of at least one node in the other nodes is normal operation, and end the fault determination.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A power distribution network fault judgment method is characterized by comprising the following steps:
after the fault information is obtained, determining whether a fault node indicated by the fault information is a bottommost node in a pre-established power distribution network hierarchical topology model;
if the fault node indicated by the fault information is determined not to be the lowest node in a pre-established power distribution network hierarchical topology model, determining the next node of the fault node, and respectively determining whether the operation information of each next node is a fault;
if the operation information of each next layer node of the fault node is determined to be a fault, determining the operation information of the fault node to be a fault;
determining a node on the previous layer of the fault node, and determining other nodes which belong to the topology layer of the fault node and are included in the node on the previous layer;
respectively determining whether the operation information of each node in the other nodes is a fault;
if the operation information of each node in the other nodes is determined to be a fault, determining that the operation information of the previous layer node is the fault, and determining whether the previous layer node is the topmost node of the power distribution network hierarchical topology model;
if the previous layer node is determined not to be the topmost node of the power distribution network hierarchical topology model, taking the previous layer node as a new fault node, returning to the step of executing the previous layer node for determining the fault node and determining other nodes which belong to the topology layer of the fault node and are included by the previous layer node, and the subsequent steps;
and if the previous layer node is determined to be the topmost node of the power distribution network hierarchical topology model, ending the fault judgment.
2. The method of claim 1, further comprising:
and if the fault node indicated by the fault information is determined to be the lowest node in the pre-established power distribution network hierarchical topology model, executing the step of determining the node on the previous layer of the fault node, and determining other nodes which belong to the topology layer where the fault node is located and are included in the node on the previous layer, and the subsequent steps.
3. The method of claim 1, further comprising:
and if the operation information of at least one next layer node in the next layer node of the fault node is determined to be normal operation, determining that the operation information of the fault node is normal operation.
4. The method of claim 1, further comprising:
and if the operation information of at least one node in the other nodes is determined to be normal operation, determining the operation information of the node on the upper layer to be normal operation, and finishing the fault judgment.
5. The method according to any one of claims 1 to 4, wherein the hierarchical topology model of the power distribution network is a five-layer topology structure, which is a feeder trunk layer, a feeder branch layer, a distribution layer, a low-voltage line layer and a user layer in sequence from the top layer to the bottom layer; the feeder line trunk layer comprises feeder line trunk nodes, the feeder line branch layer comprises feeder line branch line nodes, the distribution and transformation layer comprises distribution and transformation nodes, the low-voltage line layer comprises low-voltage line nodes, and the user layer comprises user nodes.
6. The method of claim 5, wherein the fault information comprises at least one of:
the power failure alarm information of the user node, the power failure alarm information of the low-voltage line node, the power failure alarm information of the distribution and transformation node, the power failure alarm information of the feeder line main line node and the power failure alarm information of the feeder line branch line node.
7. The utility model provides a distribution network fault judgment device which characterized in that includes:
the first determining unit is used for determining whether a fault node indicated by the fault information is a lowest node in a pre-established power distribution network hierarchical topology model after the fault information is acquired; if the fault node indicated by the fault information is determined not to be the lowest node in a pre-established power distribution network hierarchical topology model, determining the next node of the fault node, and respectively determining whether the operation information of each next node is a fault; if the operation information of each next layer node of the fault node is determined to be a fault, determining the operation information of the fault node to be a fault;
a second determining unit, configured to determine a node on a previous layer of the failed node, and determine other nodes included in the node on the previous layer and belonging to a topology layer where the failed node is located; respectively determining whether the operation information of each node in the other nodes is a fault; if the operation information of each node in the other nodes is determined to be a fault, determining the operation information of the node at the previous layer as the fault;
a third determining unit, configured to determine whether the previous-layer node is a topmost node of the hierarchical topology model of the power distribution network; if the previous layer node is determined not to be the topmost node of the power distribution network hierarchical topology model, taking the previous layer node as a new fault node, and calling the second determination unit; and if the previous layer node is determined to be the topmost node of the power distribution network hierarchical topology model, ending the fault judgment.
8. The apparatus according to claim 7, wherein the first determining unit is further configured to invoke the second determining unit if it is determined that the failed node indicated by the failure information is a lowest node in a pre-established hierarchical topology model of the power distribution network.
9. The apparatus according to claim 7, wherein the first determining unit is further configured to determine that the operation information of the failed node is normal operation if it is determined that the operation information of at least one of the nodes in the next layer of the failed node is normal operation.
10. The method according to claim 1, wherein the second determining unit is further configured to determine that the operation information of the previous node is normally operating and end the fault determination if it is determined that the operation information of at least one node in the other nodes is normally operating.
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