A method and system for active distribution network fault location based on current polarity comparison
An active distribution network and fault location technology, which is applied to fault location, information technology support system, and fault detection according to conductor type, etc., can solve the problems of identification difficulties, low fault location accuracy, and fault location methods that cannot be applied to distributed power sources. Distribution network and other problems, to achieve the effect of simple polarity judgment method and short time
Active Publication Date: 2019-02-19
江苏恒新源电气有限公司
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Problems solved by technology
[0006] In order to solve the above problems, the present invention overcomes that the traditional fault location method cannot be applied to the active distribution network containing distributed power sources, or the traditional fault location method has low fault location accuracy and difficulty in identification when it is applied to the active distribution network. For the problem of requiring additional installation of equipment, a method and system for active distribution network fault location based on current polarity comparison are provided
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Embodiment 1
[0097] A fault location method for active distribution network based on current polarity comparison,
[0098] Such as figure 1 Shown is the program flow chart of the fault location method based on current polarity comparison of the present invention. The specific algorithm for fault location is as follows:
[0099] (1) First judge whether the system is a small current grounding system or a large current grounding system,
[0100] If it is a small current grounding system, perform the following operations:
[0101] (a) Real-time detection of each phase current and calculation of zero-sequence current;
[0102] (b) Determine whether a phase-to-phase short-circuit fault has occurred according to formula (1), if yes, perform the following operations in sequence; otherwise, go to step (d);
[0103] (c) Determine whether a phase-to-phase short circuit fault has really occurred according to formula (3), if yes, go to step (f); otherwise, perform the following operations;
[0104...
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The invention relates to an active power distribution network fault positioning method based on current polarity comparison. Each detection point of an active power distribution network feed line is provided with a switch and an FTU, the FTUs are in information interaction via communication network. The FTUs detect the fault current in real time, the current abrupt change time is taken as the fault starting point, the fault current signal of half cycle after the fault is recorded, the polarity is calculated according to the data of the half cycle, and the fault positioning is realized by comparing the polarity of the fault current of the adjacent detection points. In addition, when the fault positioning credibility is low and missed reporting occurs, the data detected at the downstream replaces the detection point data to realize the fault positioning, so that the method has a certain fault tolerance capability. The high-precision fault positioning of the active power distribution network including a distributed power supply can be realized, and the rapid fault positioning can be realized as well, so that the requirement of the active power distribution network can be met. The method further supports the power distribution network of the high-permeability distributed power supply, and facilitates the promotion of energy saving and emission reduction and smart grid construction.
Description
technical field [0001] The invention belongs to the technical field of power line fault location in electric power systems, and in particular relates to an active distribution network fault location method and system based on current polarity comparison. Background technique [0002] In the power system, fast and accurate fault location is a very important link to ensure the normal operation of the power system and reduce the average power outage duration index of the system. [0003] With a large number of distributed generation (Distributed Generation, DG) connected to the distribution network, the planning, operation and control of the distribution network have become hot issues in the smart distribution network. The active distribution network technology that can realize the functions of active planning, active management and active control is undoubtedly a new idea to solve these problems. The active distribution network has changed from the original radial network wit...
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IPC IPC(8): G01R31/08
CPCG01R31/086Y04S10/52
Inventor 庞清乐朱礼营杨福刚张艳丽李希年
Owner 江苏恒新源电气有限公司