Fault positioning method for power distribution network containing distributed power supply
A technology for distributed power supply and fault location, which is applied in the direction of fault location, fault detection according to conductor type, and measurement of electricity, can solve the problem that traditional fault location methods cannot be directly applied to distribution networks including distributed power sources, and achieve the goal of avoiding impact Effect
Inactive Publication Date: 2022-03-01
STATE GRID ZHEJIANG HANGZHOU XIAOSHAN POWER SUPPLY CO +1
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[0003] The present invention mainly solves the technical problem that the traditional fault location method in the prior art cannot be directly applied to the distribution network with distributed power sources, and provides a method for locating faults in the distribution network with distributed power sources
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[0066] The accuracy of fault location in the distribution network can be improved by adopting the line model considering the line-to-ground capacitance in the distribution network. Therefore, in addition to the line impedance, the line model adopted here also takes into account the line-to-ground capacitance. In addition, when performing power frequency analysis, the parameters of power lines are often expressed in the form of lumped parameters. Therefore, the line model considering the capacitance to ground is as follows: figure 1 shown, where R L 、X L is the resistance and reactance of the power line, B L is the susceptance of the power line.
[0067] Since the place where the three-phase overhead line is laid is a certain distance from the ground, the earth will have an impact on the electric field around the overhead line. Under the power frequency, the equivalent susceptance corresponding to the unit length of the overhead line can be known by using the mirror image me...
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The invention discloses a fault positioning method for a power distribution network containing a distributed power supply. The fault positioning method comprises the following steps: S101, determining an equivalent impedance matrix behind each bus in the power distribution network; s102, carrying out segmented numbering on the line; s103, determining a fault current initial value; s104, substituting the fault current initial value into the fault positioning equation, and solving to obtain a first iteration fault position; s105, performing the ith iteration, updating the fault current according to the fault position, and then solving to obtain the fault position; s106, if the fault position converges, skipping to S107, otherwise, skipping to S105 after i is increased by 1; s107, if the value of the fault position is within the line range of the section p, the step S108 is executed after the result is stored; otherwise, directly skipping to S108; and S108, jumping to the step S103 to check the next segment, and if the next segment is the last segment, ending. The scheme is suitable for the IIDG-accessed power distribution network.
Description
technical field [0001] The invention relates to the field of distribution network state monitoring and analysis, in particular to a fault location method for a distribution network containing distributed power sources. Background technique [0002] After a fault occurs in the distribution network, accurately determining the fault location plays a very positive role in improving the reliability of the distribution network. However, with the widespread access of distributed power sources, the distribution network has changed from a traditional radial single power supply network structure to a complex network structure powered by double-terminal or even multi-terminal power supplies, and the fault location method suitable for traditional distribution networks will not be directly applicable. In the distribution network containing IIDG (distributed power generation). Contents of the invention [0003] The present invention mainly solves the technical problem that the traditio...
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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 徐巍峰余彬陈飞铃翁利国朱小炜练德强
Owner STATE GRID ZHEJIANG HANGZHOU XIAOSHAN POWER SUPPLY CO