Phase-line Voltage Detection Method of Transmission Line Based on Chebyshev Integral

Abstract

A phase line voltage detection method of a transmission line based on the Chebyshev integral algorithm provided by the present invention includes the following steps: S1: determine the voltage integration path of the phase line of the transmission line, arrange an electric field sensor on the integration path and detect the phase line S2: Establish the voltage calculation model of the phase line; S3: Divide the integral path of the phase line voltage into a non-abrupt integral interval and an abrupt integral interval, calculate respectively, and sum the calculation results to obtain the phase line of the transmission line Voltage, establishing the Chebyshev integral calculation model of the sudden integral interval to calculate the voltage of the abrupt integral interval; S4: calculating the voltage of the non-abrupt integral area. The invention optimizes the arrangement position of the electric field sensor, increases the minimum distance between the arrangement point of the electric field sensor and the transmission line, and reduces the risk of the sensor being broken down. At the same time, in the Chebyshev integral calculation process, the position of the integration point is obtained, and the position of the actual electric field sensor arrangement point is optimized and adjusted according to the position.

Description

technical field [0001] The invention relates to a phase-line voltage detection method of a power transmission line, in particular to a phase-line voltage detection method of a power transmission line based on Chebyshev integral. 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 three main methods for the phase-to-line voltage of the transmission line: The first is direct measurement. Since the transmission line is often at a high voltage level, the use of Direct measurement has extremely high requirements for equipment, has potential safety hazards, and is susceptible to external interference, resulting in low accuracy of measurement results; the second method is to measure the electric field through an electric field sensor, and then legally calculate the phase-line voltage through an analog point, but This method still has the following problems: it is easy to receiv...

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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 three main methods for the phase-to-line voltage of the transmission line: The first is direct measurement. Since the transmission line is often at a high voltage level, the use of Direct measurement has extremely high requirements for equipment, has potential safety hazards, and is susceptible to external interference, resulting in low accuracy of measurement results; the second method is to measure the electric field through an electric field sensor, and then legally calculate the phase-line voltage through an analog point, but This method still has the following problems: it is easy to receive environmental interference, on the other hand, the existing algorithm is mainly solved by the simulated charge method, and the calculation process is complicated due to the overdetermined equations involved in the solution process, and there are No solution, multiple solutions or wrong results, resulting in inaccurate measurement results; the third method is based on the second method, using a non-contact electric field sensor to measure the electric field, and then using the Gauss-Legendre integral algorithm to measure the electric field. Calculate the phase-to-phase voltage of the line

[0005] The phase-to-line voltage detection method of the Gauss-Legendre integral transmission line does not optimize the integration point for the distribution characteristics of the electric field under the transmission line. The electric field is measured repeatedly, and the electric field measurement results of different electric field measurement points on this integration path are not much different, so the integration points contain less information, resulting in a waste of electric field sensor layout, and the accuracy needs to be further improved

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