CN103267926A - Data-gram (DG)-containing power distribution network fault distance measurement for fault feature matching based on differential evolution algorithm - Google Patents
Data-gram (DG)-containing power distribution network fault distance measurement for fault feature matching based on differential evolution algorithm Download PDFInfo
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Abstract
The invention discloses a novel data-gram (DG)-containing power distribution network fault distance measurement method. According to the method, a three-phase impedance model and a zero sequence impedance model of a DG-containing power distribution network, and fault feature values are analyzed and extracted. According to a power grid theory, the fault feature value of the DG-containing power distribution network at a fault point is 0; a node with the minimum fault feature value is a fault branch association node; a fault region is positioned; and a fault line is determined. The fault line, a fault distance and a grounding resistance are used as variables, and the fault feature value is used as a fitness function; by the differential evolution algorithm, a fault condition is automatically searched; and the fault distance, which is a precision fault distance measurement result, with the minimum fault feature value is found out.
Description
Technical field
The present invention relates to a kind of DG of containing distribution network failure distance-finding method, set up the three-phase impedance model and the zero sequence impedance model that contain the DG power distribution network, analyze and extract the fault signature value.Containing the fault signature value of DG power distribution network at the place, trouble spot as can be known according to the electrical network theory is 0, and the node of fault signature value minimum is the fault branch associated nodes, and faulty line is determined in the fault location interval.Being variable with faulty line, fault distance and stake resistance, is fitness function with the fault signature value, utilizes differential evolution algorithm that fault condition is searched for automatically, finds out fault signature value fault distance hour and is accurate fault localization result.
Background technology
Power distribution network topological structure complexity easily breaks down, and to the diagnosis of distribution network failure with to repair be the emphasis of domestic and international work about electric power person's research always, power distribution network distance-finding method research center of gravity has been transferred to in the research that contains DG distribution network failure distance-finding method in recent years.The existing DG of containing distribution network failure distance-finding method can still be divided into impedance analysis method, traveling wave method, injection method on the principle, based on area positioning method and the artificial intelligence localization method of distribution automation system information, the whole bag of tricks all has its certain relative merits.Simultaneously under the prior art condition, distribution feeder busbar voltage, each feeder line go out the electric current and voltage of line current and each DG access point can synchronous measure.Therefore, press for a kind of definite measured information of utilizing of research to containing the new method that the DG distribution network failure is quick and precisely found range, to improve distance accuracy and computing velocity.
Summary of the invention
The present invention is intended to overcome the deficiency of above-mentioned existing distribution network failure distance-finding method, propose a kind of foundation and contain DG power distribution network impedance model, analyze and extract the system failure feature under the respective impedance model, the failure definition eigenwert, realize the precision ranging of fault on the basis in fault location interval, a kind of DG distribution network failure range finding new method, the applicable overhead transmission line of this distance-finding method, also applicable cable trough ceases to be busy commingled system of containing of final formation.
The technical scheme that the present invention takes for its purpose of realization is: at first foundation contains DG power distribution network three-phase impedance model and zero sequence impedance model, analyze and extract the fault signature that contains under the DG distribution impedance model, utilization contains the interval location technology of DG distribution network failure according to the fault signature search fault branch associated nodes of trouble spot, fault location interval based on the impedance model fault signature.At impedance model, to orient on the basis of fault section with fault distance and stake resistance be variable, be evolution fitness index with system failure characteristic matching degree under the different faults, utilize differential evolution algorithm to search for the fault condition that mates the most with the physical fault feature fast, realize the precision ranging of fault.
Realize as follows:
(1) contains the foundation of DG power distribution network three-phase impedance model and zero sequence impedance model;
Solidly earthed neutral system generation single-phase, two-phase and three-phase ground short circuit fault, neutral point do not adopt three-phase dissymmetrical impedance model when solidly grounded system and neutral by arc extinction coil grounding system generation two-phase and three-phase ground short circuit fault.Neutral point does not adopt the zero sequence impedance model when solidly grounded system and neutral by arc extinction coil grounding system single phase ground fault fault.
(2) contain DG distribution network failure signature analysis based on impedance model;
Calculating the fault current of trouble spot when the j node by the false voltage component at power measurement point i place is:
The fault current that is produced by each power supply acting in conjunction is:
This node short-circuit current that calculates from each power measurement point voltage fault component when defining a certain node and breaking down and the absolute deviation of this node short-circuit current of gained is calculated in all power supply actings in conjunction and be the fault signature value of studying that contains the DG power distribution network.Then the fault signature value is:
(3) contain the location in DG distribution network failure interval;
(4) based on the precision ranging that contains the DG distribution network failure of differential evolution algorithm.
If the trouble spot occurs in a certain fault branch apart from first node location
The place then can be at the newly-increased node in place, trouble spot
Node, the update the system parameter.Then one
Node has
The impedance matrix model dimension that contains the DG power distribution network of individual measured node becomes
Owing to oriented fault section, be variable with fault distance and stake resistance, be fitness function to increase node newly in the fault signature value that contains under the new impedance model of DG distribution network system, utilize differential evolution algorithm to searching for automatically, find out the abort situation that fault signature mates the most and be accurate positioning result.
Inventive principle:
1, uses impedance method and carry out Modeling Research to containing the DG power distribution network
When the fault current of three-phase is too small when fault, using three-phase fault failure of the current specification error can be bigger, can extract the zero-sequence current fault signature of fault this moment, need set up the zero sequence impedance model of system, otherwise then utilize the feature of three-phase fault electric current, set up three-phase dissymmetrical impedance model.The title impedance model that contains the DG power distribution network comprises the three-phase impedance model of the three-phase impedance model of system's primary power and DG, transformer, the three-phase impedance model of circuit and the three-phase impedance model of load.
2, contain DG power distribution network short-circuit current fault signature analysis and extraction
Containing DG power distribution network impedance mathematical model actual is an asymmetric impedance model, description be to comprise the node voltage fault component of each power supply point (comprise feeder line power supply and each DG etc.) and the relational model of short-circuit current in the power distribution network.As contain in the DG power distribution network each power supply place electric current and voltage fault component and can survey, the fault current size in the time of then can obtaining that arbitrary node breaks down in the distribution network by the system impedance matrix model.
This node short-circuit current that calculates from each power measurement point voltage fault component when defining a certain node and breaking down and the absolute deviation of this node short-circuit current of gained is calculated in all power supply actings in conjunction and be the fault signature value of studying that contains the DG power distribution network.
From electric network theory as can be known, suppose that a certain node breaks down, then the fault current of this node that calculates by each power supply point voltage failure component is identical with the fault current that all power supply actings in conjunction produce.According to this theory, then improving the fault signature value that contains the DG power distribution network under the impedance model at place, real trouble spot is 0.
3, contain the range finding of DG distribution network failure based on differential evolution algorithm
Obtaining on the basis of faulty line, establishing the trouble spot and occur in this fault branch apart from first node location
The place then can be at the newly-increased node in place, trouble spot
Node, the update the system parameter.Then one
Node has
The impedance matrix model dimension that contains the DG power distribution network of individual measured node becomes
Owing to oriented fault section, be variable with fault distance and stake resistance, be fitness function to increase node newly in the fault signature value that contains under the new impedance model of DG distribution network system, utilize differential evolution algorithm to searching for automatically, find out the abort situation that fault signature mates the most and be accurate positioning result.
The present invention is special to consider that the situation of dissimilar earth faults takes place various distribution systems, sets up to contain DG power distribution network three-phase dissymmetrical impedance model and zero sequence impedance model, analyzes and extract the short-circuit current fault signature that contains under the DG distribution impedance model.Obtaining on the basis of faulty line, be variable with fault distance and stake resistance, be fitness function to increase node newly in the fault signature value that contains under the new impedance model of DG distribution network system, utilize differential evolution algorithm to searching for automatically, realize the precision ranging of fault.
Description of drawings
Fig. 1 is fault distance-finding method process flow diagram of the present invention;
Fig. 2 is for containing DG distribution network system figure.
Embodiment
Foundation contains DG power distribution network three-phase dissymmetrical impedance model and zero sequence impedance model, analyzes and extract the short-circuit current fault signature that contains under the DG distribution impedance model.Carry out the fault section location according to the character of fault signature value, obtaining on the basis of faulty line, be variable with fault distance and stake resistance, be fitness function to increase node newly in the fault signature value that contains under the new impedance model of DG distribution network system, utilize differential evolution algorithm to searching for automatically, realize the precision ranging of fault.
Claims (8)
1. at first set up and contain DG power distribution network three-phase impedance model and zero sequence impedance model based on the DG distribution network failure distance-finding method that contains of differential evolution algorithm fault signature coupling, analyze and extract the fault signature that contains under the DG distribution impedance model, utilization contains the interval location technology of DG distribution network failure according to the fault signature search fault branch associated nodes of trouble spot, fault location interval based on the impedance model fault signature.
At impedance model, to orient on the basis of fault section with fault distance and stake resistance be variable, be evolution fitness index with system failure characteristic matching degree under the different faults, utilize differential evolution algorithm to search for the fault condition that mates the most with the physical fault feature fast, realize the precision ranging of fault.
3. by Matlab/Simulink numerical simulation data the DG distribution network failure distance-finding method that contains that proposes is verified at last, realized as follows.
4.(1) contain the foundation of DG power distribution network three-phase impedance model and zero sequence impedance model;
Solidly earthed neutral system generation single-phase, two-phase and three-phase ground short circuit fault, neutral point do not adopt three-phase dissymmetrical impedance model when solidly grounded system and neutral by arc extinction coil grounding system generation two-phase and three-phase ground short circuit fault;
Neutral point does not adopt the zero sequence impedance model when solidly grounded system and neutral by arc extinction coil grounding system single phase ground fault fault.
5.(2) contain DG distribution network failure signature analysis based on impedance model;
This node short-circuit current that calculates from each power measurement point voltage fault component when defining a certain node and breaking down and the absolute deviation of this node short-circuit current of gained is calculated in all power supply actings in conjunction and be the fault signature value of studying that contains the DG power distribution network.
6.(3) contain the location in DG distribution network failure interval.
7.(4) based on the precision ranging that contains the DG distribution network failure of differential evolution algorithm;
If the trouble spot occurs in a certain fault branch apart from first node location
The place then can be at the newly-increased node in place, trouble spot
Node, update the system parameter, then one
Node has
The impedance matrix model dimension that contains the DG power distribution network of individual measured node becomes
8. owing to oriented fault section, be variable with fault distance and stake resistance, be fitness function to increase node newly in the fault signature value that contains under the new impedance model of DG distribution network system, utilize differential evolution algorithm to searching for automatically, find out the abort situation that fault signature mates the most and be accurate positioning result.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104316840A (en) * | 2014-11-07 | 2015-01-28 | 国家电网公司 | Positioning method and device for fault branches of mixed multi-branch nodes of power distribution network |
| CN104599193A (en) * | 2015-01-16 | 2015-05-06 | 国家电网公司 | Rule base based single-phase ground fault positioning method of distribution network |
| CN105320810A (en) * | 2015-10-15 | 2016-02-10 | 中国南方电网有限责任公司电网技术研究中心 | Short-circuit current scanning optimization method |
| CN106772179A (en) * | 2016-12-13 | 2017-05-31 | 国网北京市电力公司 | The modification method and device of zero-sequence impedance parameter |
| CN107064736A (en) * | 2017-03-22 | 2017-08-18 | 华南理工大学 | A kind of Fault Locating Method that inverse distributed power power distribution network is connect containing many T |
| CN107271845A (en) * | 2017-06-20 | 2017-10-20 | 广东电网有限责任公司中山供电局 | A kind of online distance-finding method of protection fault information management system |
| CN107632225A (en) * | 2017-08-11 | 2018-01-26 | 国网湖南省电力公司 | A kind of small current system Earth design method |
| CN109342885A (en) * | 2018-11-14 | 2019-02-15 | 华北电力大学（保定） | A kind of localization method and system of DC distribution net line fault |
| CN113466631A (en) * | 2021-07-23 | 2021-10-01 | 扬州德云电气设备集团有限公司 | Active power distribution network fault positioning method based on feeder line marking method-impedance method |
| CN114113948A (en) * | 2021-12-03 | 2022-03-01 | 福建省宏闽电力工程监理有限公司 | Power distribution network fault monitoring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104316840A (en) * | 2014-11-07 | 2015-01-28 | 国家电网公司 | Positioning method and device for fault branches of mixed multi-branch nodes of power distribution network |
| CN104599193A (en) * | 2015-01-16 | 2015-05-06 | 国家电网公司 | Rule base based single-phase ground fault positioning method of distribution network |
| CN105320810A (en) * | 2015-10-15 | 2016-02-10 | 中国南方电网有限责任公司电网技术研究中心 | Short-circuit current scanning optimization method |
| CN105320810B (en) * | 2015-10-15 | 2019-01-04 | 中国南方电网有限责任公司电网技术研究中心 | Short-circuit current scanning optimization method |
| CN106772179A (en) * | 2016-12-13 | 2017-05-31 | 国网北京市电力公司 | The modification method and device of zero-sequence impedance parameter |
| CN106772179B (en) * | 2016-12-13 | 2019-06-28 | 国网北京市电力公司 | The modification method and device of zero-sequence impedance parameter |
| CN107064736A (en) * | 2017-03-22 | 2017-08-18 | 华南理工大学 | A kind of Fault Locating Method that inverse distributed power power distribution network is connect containing many T |
| CN107064736B (en) * | 2017-03-22 | 2019-04-09 | 华南理工大学 | A kind of Fault Locating Method connecing inverse distributed power power distribution network containing more T |
| CN107271845A (en) * | 2017-06-20 | 2017-10-20 | 广东电网有限责任公司中山供电局 | A kind of online distance-finding method of protection fault information management system |
| CN107632225B (en) * | 2017-08-11 | 2019-07-23 | 国网湖南省电力公司 | A kind of small current system Earth design method |
| CN107632225A (en) * | 2017-08-11 | 2018-01-26 | 国网湖南省电力公司 | A kind of small current system Earth design method |
| CN109342885A (en) * | 2018-11-14 | 2019-02-15 | 华北电力大学（保定） | A kind of localization method and system of DC distribution net line fault |
| CN109342885B (en) * | 2018-11-14 | 2020-10-30 | 华北电力大学（保定） | Method and system for positioning line fault of direct-current power distribution network |
| CN113466631A (en) * | 2021-07-23 | 2021-10-01 | 扬州德云电气设备集团有限公司 | Active power distribution network fault positioning method based on feeder line marking method-impedance method |
| CN114113948A (en) * | 2021-12-03 | 2022-03-01 | 福建省宏闽电力工程监理有限公司 | Power distribution network fault monitoring method |
| CN114113948B (en) * | 2021-12-03 | 2023-10-20 | 中达安股份有限公司 | Power distribution network fault monitoring method |
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Application publication date: 20130828 |