Method and device for measuring overvoltage of alternating-current power transmission line based on controllable phase shifter

Abstract

The invention discloses a method and device for measuring overvoltage of an alternating-current power transmission line based on a controllable phase shifter, and the method comprises the steps: constructing an overvoltage simulation analysis model through combining a controllable phase shifter model, a power grid electromagnetic transient simulation model, a power grid operation state and a power grid operation mode, and outputting simulation results under different working conditions, wherein the simulation results under different working conditions comprise power frequency overvoltage simulation data under a no-load long line and a fault-free load shedding condition and operation overvoltage simulation data under a switching-on no-load line; and performing data fitting according to the simulation results under different working conditions, the gear of the controllable phase shifter and the line length to determine a fitting function, and measuring overvoltage values under different working conditions according to the fitting function. According to the fitting function constructed by the method, the overvoltage of the power transmission line of the controllable phase shifter under different working conditions can be quickly calculated, and the measurement accuracy is improved while the calculation amount is reduced.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method and device for measuring the overvoltage of an AC transmission line based on a controllable phase shifter. Background technique [0002] With the increasing size of the power grid, the increasingly complex AC power grid, and the gradual formation of a pattern of "power transmission from west to east, mutual supply between north and south, and national networking", 500kV transmission lines have gradually become the AC backbone of the power grid. As the actual operation of the system is affected by grid structure, line parameters, operation mode, etc., the 500kV transmission line may have unreasonable power flow distribution, which will limit the transmission capacity of the line or endanger the safety of the system. As an effective means of power flow control, phase-shifting transformers have been used in North America, Europe and Japan power grids for many years du...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a controllable phase shifter-based AC transmission line overvoltage measurement method to solve the problems of large amount of calculation and low efficiency when calculating overvoltage in the prior art

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