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Using directional elements to improve the location method of fault section in distribution network with distributed generation
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A distributed power supply and distribution network fault technology, applied in the direction of fault location, electrical components, emergency protection circuit devices, etc., can solve the problems of distribution network fault location and impact, and achieve the effect of reducing investment
Inactive Publication Date: 2017-02-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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[0004] The purpose of the present invention is to improve the existing fault location technology of distribution network, and propose a fault location method for distribution network containing distributed power, to solve the fault of distribution network containing distributed Influence of short-circuit current provided by conventional power supply on distribution network fault location
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Embodiment 1
[0020] Such as Figure 1B As shown, a short-circuit fault occurs at point K1, and the location is in the T2 area of the T-connection area, and the direction of the fault current is shown in the figure. If feeder switches S1, A, B, C, D, E, D1, Q, P, O, D2, F, G, H, and I all collect fault overcurrent information, due to the feeder switches E, F and O are equipped with directional elements, and the short-circuit current at E of the feeder switch Provided by the main power supply, it is the fault current in the positive direction, and the short-circuit current at the F and O of the feeder switch Provided by DG, it is the fault current in the reverse direction, based on which it can be judged that the fault occurred in the T2 area.
Embodiment 2
[0022] Such as figure 2 As shown, a short-circuit fault occurs at point K2, and the location is in the other area A6 that does not contain T junctions.
[0023] Step 1: If the feeder switches S1, A, B, C, D, E, D1, Q, P, O, F, G, D2, I, H all collect fault overcurrent information, at this time only according to the fault current direction It is judged that the fault occurred in other areas that do not contain T-junctions.
[0024] Step 2: Compare the fault current amplitudes collected by feeder switches C, D, E, F, G, H, and I in other areas without T connection, and find the fault current flowing through feeder switches F, G Fault current flowing through feeder switch H, I And the current flowing through the feeder switches G and H on both sides of the fault point And the difference between the two exceeds the set margin (obtained by considering the comprehensive error caused by the transmission error of the current transformer, the sampling and calculation error of th...
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Abstract
The invention discloses a method for improving positioning of a fault section of a power distribution network including a distributed power supply through directional elements. The method comprises the steps that (1) after the power distribution network including the distributed power supply breaks down, whether a fault occurs in an area with a T joint or an area without a T joint is judged according to the direction of fault current reported by switches around a fault point; (2) if the direction information of the fault reported by the directional element on the side with the fault current supplied by a main power supply is in the positive direction, and the direction information of the fault reported by the directional element on the side with the fault current supplied by the distributed power supply is in the negative direction, it is accordingly judged that the fault occurs in the area with the T joint, and thus the fault isolation is conducted; (3) if the direction information of the fault current provided by feeder line switches around the fault point is identical, it is judged that the fault occurs in area without the T joint. The amplitude values of the fault current of the switches on the two sides of the fault point are different, the fault current crossing the switches on the same side of the fault point is approximately identical, and thus the specific area where the fault occurs can be judged and fault isolation can be conducted accordingly.
Description
technical field [0001] The invention belongs to the technical field of electric powersystemautomation, and relates to fault location of a distribution network, in particular to a method for improving fault section location of a distribution network containing distributed power sources by using directional elements. Background technique [0002] With the rapid development of distributed power generation technologies represented by various new types of renewable energy such as wind energy, solar energy, biomass energy, ocean energy, and geothermal energy, a large number of distributed power sources are connected to the distribution network, and the power flow distribution will change accordingly. Changes, the short-circuit current situation will also change greatly during the fault, which puts forward new requirements for the system, especially in the fault location, which makes the traditional distribution network fault location method no longer applicable. In order to corr...
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