Method for measuring distance between two ends based on real-time circuit parameter measurement

Abstract

The invention provides a method for measuring the distance between two ends based on real-time circuit parameter measurement. The method comprises the following steps: 1) when a power transmission circuit has a failure, a data collection device synchronously samples voltage and current signals of two ends of the circuit, and completes alignment of sampled data on two sides of the power transmission circuit; 2) the voltage and current values before the circuit has the failure are substituted into a parametric equation to acquire real-time circuit parameters; and 3) the real-time circuit parameters and the voltage and current values at the failure moment are substituted into a dual-end voltage linear distributional equation to acquire the distance from the transmission circuit failure pointto a reference point. By utilizing the method, the distance measurement accuracy is high, and is not influenced by the environment surrounding the circuit, weather and other factors, so that distancemeasurement errors caused by inaccurate circuit parameters are avoided. By searching the rule of voltage linear distributed equation, a dual-end distance measurement equation can be quickly solved with small calculated amount, and non-convergent result or false root which possibly exists in the conventional solving method cannot occur. In the method, the launched data collection device is utilized, but a new device is not required.

Description

technical field [0001] The invention relates to power system fault testing, in particular to a double-terminal ranging method based on real-time line parameter measurement. Background technique [0002] The fault point distance measurement methods of existing transmission lines are classified according to the way of obtaining electrical quantities, mainly including single-end distance measurement method and double-terminal distance measurement method. The single-ended ranging method is to calculate the fault distance by testing the electrical quantity on one side of the transmission line. Due to the limited electrical quantity information obtained, it is difficult to avoid the influence of the transition resistance of the fault point and the change of system operating parameters on the ranging result; the double-ended ranging method The fault point voltage calculated based on the distribution equation of the substation M voltage at one end of the transmission line and the di...

AI Technical Summary

Problems solved by technology

However, the line parameters are closely related to the operation of the line, the surrounding environment of the line, and the climatic conditions. There is a gap between the line parameters used in the solution of double-terminal ranging and the actual parameters of the faulty transmission line, resulting in the existence of double-terminal ranging results. relatively large error

In addition, the existing iterative method or search method for solving the double-terminal ranging equation has a relatively large amount of calculation, and the result may not converge or there may be pseudo-roots

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