Abstract
T-type transmission lines have been increasingly used in distribution networks because of the distributed generation integration, but inaccurate line parameters will cause significant error in the results of most existing fault location algorithms for this kind of line. In order to improve the precision, this paper proposes a new fault location algorithm taking line parameters as unknowns. The fault is assumed to occur on each section, and corresponding ranging equations can be built based on one set of three-terminal post-fault synchronous measurements, without using line parameters as inputs. Then, more sets of measurements are utilized to increase the redundancy of equations to resist the influence of data error. The reliable trust-region algorithm is used to solve each group of equations, but only equations of the assumed faulty section with the actual fault point can give the reasonable solutions, accordingly identifying the fault point. The performance of the proposed method is thoroughly investigated with MATLAB/Simulink. The results indicate that the algorithm has a high accuracy and is basically unaffected by fault position, fault resistance, unbalanced fault type, line parameter, and data error.
Highlights
The use of T-type transmission lines is rapidly increasing in distribution networks due to their greater capability and flexibility in power supply [1]
Fault location algorithms for T-type transmission lines can be categorized into two types: one is based on a travelling wave and another type uses measured impedance
T-typetransmission transmissionlines linesof of a distribution network usually algorithm assumes that transmission lines are fully transposed and neglects the shunt capacitances this algorithm assumes that transmission lines are fully transposed and neglects the shunt
Summary
The use of T-type transmission lines is rapidly increasing in distribution networks due to their greater capability and flexibility in power supply [1]. For the fault location for distribution network T-type transmission lines, methods in References [6,7,8,9,10,11,12,13,14] cannot perform well under conditions where the line parameters are inaccurate or unknown. The method proposed by Reference [16] relies on measurement devices with a high sampling frequency and is better to be used for long distance transmission lines due to the use of a distributed time-domain line model. The fault point is directly found because only the group of equations of the assumed faulty section with the actual fault can give reasonable solutions In such a case, the data of measurement devices with a typical sampling frequency (e.g., 6.4 kHz) can be used due to the use of a Π-type equivalent line model in this algorithm.
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