阅读说明：本技术 一种多端电力线路故障定位方法 (A kind of multiterminal feeder line fault localization method ) 是由 冯光 喻锟 祖亚瑞 曾祥君 陈明 王鹏 李理 于 2019-08-30 设计创作，主要内容包括：本发明公开了一种多端电力线路故障定位方法,根据线路分支结构,计算正常电力线路各分支长度的差值,建立线路固有距离差值矩阵；在多端电力线路的末端安装故障行波高速采集装置,线路故障时采集各线路分支末端的故障行波到达时间,计算故障电力线路各端之间的距离差值,得到故障线路计算距离差值矩阵；求故障线路计算距离差值矩阵与线路固有距离差值矩阵的差值,得到故障分支判定矩阵；根据故障分支判定矩阵判定故障点所在支路,并确定故障点位置。本发明能消除部分定位装置失灵导致的故障定位失败,不受故障类型限制和过渡电阻的影响,具有计算过程简单、实用、容错能力强、定位精度高的特点。(The invention discloses a kind of multiterminal feeder line fault localization methods to calculate the difference of each branch length of normal electricity route, establish the intrinsic distance difference matrix of route according to lines branch structure；Fault traveling wave high speed acquisition device is installed in the end of multiterminal power circuit, when line fault acquires the fault traveling wave arrival time of each lines branch end, calculates failure power circuit and the distance between respectively holds difference, obtains faulty line and calculate distance difference matrix；It asks faulty line to calculate the difference of distance difference matrix and the intrinsic distance difference matrix of route, obtains fault branch trip current；Branch where determining fault point according to fault branch trip current, and determine position of failure point.The present invention can eliminate the failure of fault location caused by the positioning device failure of part, do not influenced by fault type limitation and transition resistance, have the characteristics that calculating process is simple, practical, fault-tolerant ability is strong, positioning accuracy is high.)

1. a kind of multiterminal feeder line fault localization method, which comprises the following steps:

Step 1 calculates the difference of each branch length of normal electricity route according to lines branch structure, and establish route inherently away from Deviation value matrix A；

Step 2, when line fault, acquire the fault traveling wave arrival time of each lines branch end, and it is each to calculate failure power circuit The distance between end difference obtains faulty line and calculates distance difference matrix B；

Step 3 asks faulty line to calculate the difference of distance difference matrix B and the intrinsic distance difference matrix A of route, obtains failure Branch trip current D；

Step 4, branch where determining fault point according to fault branch trip current D, and determine position of failure point.

2. a kind of multiterminal feeder line fault localization method according to claim 1, which is characterized in that the step one In, the intrinsic distance difference matrix A of route are as follows:

Wherein, L_MTFor the distance of corresponding endpoint M to node T, endpoint indicates the route end of each route in multiterminal transmission line of electricity End, node indicate in multistage transmission line of electricity that route is connected the tie point of generation with route, the subscript expression endpoint and section of M and T The corresponding number of point, i indicate that the endpoint number of multi-point circuit, k indicate the node serial number of multi-point circuit.

3. a kind of multiterminal feeder line fault localization method according to claim 1, which is characterized in that the step two In, faulty line calculates distance difference matrix B are as follows:

Wherein, t_MThe time of endpoint M is reached for fault traveling wave, the subscript of M indicates the corresponding number of endpoint, and v is that fault traveling wave is online Velocity of wave is measured, i indicates the endpoint number of multi-point circuit.

4. a kind of multiterminal feeder line fault localization method according to claim 1, which is characterized in that the step three In, fault branch trip current D be B-A, when in fault branch trip current certain element numerical value belong to determine section [- 300m, 300m] when, the numerical value of the element is set as 0, remaining element is constant.

5. a kind of multiterminal feeder line fault localization method according to claim 1, which is characterized in that the step four In, fault branch determination method are as follows: when the row element of certain endpoint in trip current D and column element are in addition to intersection point element is 0, remaining When element is non-zero element, then determine that the branch in the endpoint to nearest T node occurs for failure；When in trip current D adjacent two When the non-zero arrangement of elements sequence of two column of endpoint is opposite, fault point occurs between the nearest T node of adjacent both ends point；Work as judgement When the column element of certain endpoint is all 0 in matrix D, failure occurs at the nearest T node of the endpoint.

6. a kind of multiterminal feeder line fault localization method according to claim 5, which is characterized in that the step four In, position of failure point calculation method are as follows: after determining fault branch, fault branch in trip current D is taken to correspond to M_iEndpoint column element Average value L_N, utilize endpoint M_iTo nearest node T_kDistanceWith averaged L_NHalf summation, obtain therefore Barrier point is away from M_iThe distance at end

Technical field

The present invention relates to a kind of multiterminal feeder line fault localization methods.

Background technique

Power circuit energy transmission is big, and the proportion weight in power grid, distance is remote, once breaking down, not only can It constitutes a threat to the safe and stable operation of electric system itself, and power consumer may be made to take a bath.With defeated The development of electric system, more and more multiterminal power circuits appear in power network.After multi-point circuit failure, caused by endanger Evil can be more serious than double line terminal failure.Therefore, there is an urgent need to multiterminal feeder line fault points quickly accurately to determine for power department Position reduces line fault and searches the time, improves power supply reliability.

The key of multiterminal feeder line fault positioning is to find fault branch, then fault point.Currently, for more The Fault Locating Method of end power circuit is mainly based upon power frequency quality method and traveling wave method.Localization method based on power frequency parameter Route lumped parameter model is mainly used, is affected by system operation mode, is not suitable for non-linear transition resistance failure The unknown situation with fault type.Since various factors influences, the multi-point circuit Fault Locating Method based on power frequency parameter is in reality Biggish position error can be inevitably generated in the application of border.

The research of traveling wave method is primarily directed to both-end or three end power circuits, due to multiterminal powerline network topological structure Particularity, fault location is big relative to both ends power circuit difficulty.Existing multiterminal feeder line fault location algorithm Calculating process it is cumbersome, still lack accurate multiterminal feeder line fault localization method.

Summary of the invention

Existing above-mentioned technical problem is positioned in order to solve existing multiterminal feeder line fault, the present invention provides a kind of multiterminal Feeder line fault localization method.The present invention is not limited by fault type, ground resistance and the method for operation, eliminates part acquisition Influence of the device failure to fault location has the characteristics that operation is simple, the positioning of practical, fast accurate, and engineer application is easy In realization, the precision and reliability of the positioning of feeder line fault traveling wave are improved.

In order to achieve the above technical purposes, the technical scheme is that,

A kind of multiterminal feeder line fault localization method, comprising the following steps:

Step 1 calculates the difference of each branch length of normal electricity route according to lines branch structure, and it is solid to establish route There is distance difference matrix A；

Step 2, when line fault, acquire the fault traveling wave arrival time of each lines branch end, calculate failure power line Difference the distance between is respectively held on road, is obtained faulty line and is calculated distance difference matrix B；

Step 3 is asked faulty line to calculate the difference of distance difference matrix B and the intrinsic distance difference matrix A of route, is obtained Fault branch trip current D；

Step 4, branch where determining fault point according to fault branch trip current D, and determine position of failure point.

A kind of multiterminal feeder line fault localization method, in the step one, the intrinsic distance difference square of route Battle array A are as follows:

Wherein, L_MTFor the distance of corresponding endpoint M to node T, endpoint indicates the line of each route in multiterminal transmission line of electricity Road end, node indicate in multistage transmission line of electricity that route is connected the tie point of generation with route, the subscript expression endpoint of M and T The corresponding number with node, i indicate that the endpoint number of multi-point circuit, k indicate the node serial number of multi-point circuit.

A kind of multiterminal feeder line fault localization method, in the step two, faulty line calculates range difference Value matrix B are as follows:

Wherein, t_MThe time of endpoint M is reached for fault traveling wave, the subscript of M indicates the corresponding number of endpoint, and v is failed row Wave on-line measurement velocity of wave, i indicate the endpoint number of multi-point circuit.

A kind of multiterminal feeder line fault localization method, in the step three, fault branch trip current D is B-A, when certain element numerical value belongs to judgement section [- 300m, 300m] in fault branch trip current, the numerical value setting of the element It is 0, remaining element is constant.

A kind of multiterminal feeder line fault localization method, in the step four, fault branch determination method are as follows: When the row element of certain endpoint in trip current D and column element are in addition to intersection point element is 0, when remaining element is non-zero element, then sentence Determine branch of the failure generation in the endpoint to nearest T node；When the two non-zero arrangement of elements of column of adjacent both ends point in trip current D When sequentially opposite, fault point occurs between the nearest T node of adjacent both ends point；When the column element of certain endpoint in trip current D When being all 0, failure occurs at the nearest T node of the endpoint.

A kind of multiterminal feeder line fault localization method, in the step four, position of failure point calculation method Are as follows: after determining fault branch, fault branch in trip current D is taken to correspond to M_iThe average value L of endpoint column element_N, utilize endpoint M_iIt arrives Nearest node T_kDistanceWith averaged L_NHalf summation, obtain fault point away from M_iThe distance at end

The technical effects of the invention are that: the present invention only need to install fault traveling wave high speed in the end of multiterminal power circuit and adopt Acquisition means acquire the initial arrival time of each end fault traveling wave signal, calculate fault branch trip current, and utilize trip current Element and lines branch length carry out fault point accurate positioning.The present invention is not by fault ground resistance, fault type and operation Mode limits, and eliminates influence of the part acquisition device failure to fault location, and easy to operate, practical, improves electricity Precision, reliability and the economy of line of force road fault traveling wave positioning.

Detailed description of the invention

Fig. 1 is flow diagram of the invention；

Fig. 2 is multiterminal power circuit illustraton of model of the invention.

Specific embodiment

Referring to Fig. 1, Fig. 2, the present embodiment is realized by following steps:

(1) according to lines branch structure, the difference of each branch length of normal electricity route is calculated, the intrinsic distance of route is established Matrix of differences A；

(2) the fault traveling wave arrival time of each lines branch end is acquired in line fault, calculates failure power circuit The distance between each end difference, obtains faulty line and calculates distance difference matrix B.In order to acquire fault traveling wave, the present embodiment is logical It crosses and is realized in the end of multiterminal power circuit installation fault traveling wave high speed acquisition device, wherein fault traveling wave high speed acquisition device For well known device.

(3) it asks faulty line to calculate the difference of distance difference matrix B and the intrinsic distance difference matrix A of route, obtains failure Branch trip current D；

(4) branch where determining fault point according to fault branch trip current D, and determine position of failure point.

In order to which goal of the invention is better achieved, the present invention can further use following technological means:

The intrinsic distance difference matrix A of route in step (1) are as follows:

In matrixFor endpoint M₁To node T₁Distance,For endpoint M₁To node T₂Distance,For end Point M₁To node T₃Distance,For endpoint M₁To node T_kDistance,For endpoint M₂To node T₁Distance, For endpoint M₂To node T₂Distance,For endpoint M₂To node T₃Distance,For endpoint M₂To node T_kDistance,For endpoint M₃To node T₁Distance,For endpoint M₃To node T₂Distance,For endpoint M₃To node T₃Away from From,For endpoint M₃To node T_kDistance,For endpoint M₄To node T₁Distance,For endpoint M₄To node T₂ Distance,For endpoint M₄To node T₃Distance,For endpoint M₄To node T_kDistance,For endpoint M_i-1It arrives Node T₁Distance,For endpoint M_i-1To node T₂Distance,For endpoint M_i-1To node T₃Distance,For Endpoint M_i-1To node T_kDistance,For endpoint M_iTo node T₁Distance,For endpoint M_iTo node T₂Distance,For endpoint M_iTo node T₃Distance,For endpoint M_iTo node T_KDistance.Endpoint indicates in multiterminal transmission line of electricity The line end of each route, node indicate in multistage transmission line of electricity that route is connected the tie point of generation with route, M and T's Subscript indicates the corresponding number of endpoint and node, and i indicates that the endpoint number of multi-point circuit, k indicate the node serial number of multi-point circuit.

Faulty line calculates distance difference matrix B in step (2) are as follows:

In matrixM is reached for fault traveling wave₁The time at end,M is reached for fault traveling wave₂The time at end,For event Hinder traveling wave and reaches M₃The time at end,M is reached for fault traveling wave₄The time at end,M is reached for fault traveling wave_i-1The time at end,M is reached for fault traveling wave_iThe time at end, v are fault traveling wave on-line measurement velocity of wave.

Step (3) fault branch trip current D is B-A, when certain element numerical value belongs to judgement in fault branch trip current When section [- 300m, 300m], the numerical value of the element is set as 0, remaining element is constant.

Step (4) fault branch determination method are as follows: when the row element of certain endpoint in trip current D and column element are except intersection point member Element is when remaining element is non-zero element, then to determine that the branch in the endpoint to nearest T node occurs for failure outside 0.Work as judgement When the non-zero arrangement of elements sequence of two column of adjacent both ends point is opposite in matrix D, the T section nearest in adjacent both ends point occurs for fault point Between point, wherein the two non-zero arrangement of elements of column of adjacent both ends point are sequentially on the contrary, the two non-zero elements of column of the adjacent both ends point referred to Simultaneously for 0 or simultaneously non-zero when, a few row elements of a certain column are non-zero, remaining row element be 0, and it is other one column in it is corresponding A few row elements are 0, remaining row element non-zero.When the column element of certain endpoint in trip current D is all 0, failure occurs at this At the nearest T node of endpoint.

Step (4) position of failure point calculation method are as follows: after determining fault branch, take fault branch in trip current D corresponding M_iThe average value L of endpoint column element_N, utilize endpoint M_iTo nearest node T_kDistanceWith averaged L_NTwo/ One summation, obtains fault point away from M_iThe distance at end is