Method for detecting phase line voltage of transmission line based on Gauss-Legendre integral

Abstract

A method for detecting the phase line voltage of a transmission line based on Gauss-Legendre integral provided by the invention includes the following steps: determining the voltage integration path of the phase line of a transmission line, arranging an electric field sensor on the integration path, and detecting the electric field value of the phase line; and building a Gauss-Legendre calculationmodel of the phase line voltage, taking the arrangement point of the electric field sensor as an integration point, and substituting the electric field value of the output end of the electric field sensor into the Gauss-Legendre calculation model to calculate the phase line voltage of the transmission line, wherein a phase line voltage calculation model is shown in the description, Phi(B) is thephase line voltage of a target transmission line, b is the distance from the phase line of the target transmission line relative to the zero potential, and E(b / 2+b / 2*tk) is the electric field value ofthe integration point. The accuracy of phase line voltage calculation can be improved, which is conducive to the accurate scheduling of a power system and the accurate evaluation of the transmissionperformance of a transmission line. Moreover, the algorithm is simple, the result is reliable, and the security risks in the traditional mode can be avoided.

Description

technical field [0001] The invention relates to a phase line voltage detection method of a power transmission line, in particular to a Gauss-Legendre integral-based phase line voltage detection method of a power transmission line. Background technique [0002] The phase-to-line voltage of the transmission line is related to the accuracy of power dispatching. In the prior art, there are two main methods for the phase-to-line voltage of the transmission line: one is direct measurement. Since the transmission line is often at a high voltage level, use Direct measurement has extremely high requirements for equipment, there are potential safety hazards, and it is easy to receive external interference, resulting in low accuracy of measurement results; the other is to measure the electric field through the electric field sensor, and then legally calculate the phase-line voltage through the analog point. However, this method still has the following problems: it is easy to receive en...

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Problems solved by technology

[0002] The phase-to-line voltage of the transmission line is related to the accuracy of power dispatching. In the prior art, there are two main methods for the phase-to-line voltage of the transmission line: one is direct measurement. Since the transmission line is often at a high voltage level, use Direct measurement has extremely high requirements for equipment, there are potential safety hazards, and it is easy to receive external interference, resulting in low accuracy of measurement results; the other is to measure the electric field through the electric field sensor, and then legally calculate the phase-line voltage through the analog point. However, this method still has the following problems: it is easy to receive environmental interference, and on the other hand, the existing algorithm is mainly solved by the analog charge method. In the Qiu Enjie process, the calculation process is complicated due to the overdetermined equations involved. , and there are no solutions, multiple solutions or wrong results, resulting in inaccurate measurement results

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