Half-wavelength power transmission line power fluctuation overvoltage optimization control method and device

Abstract

The invention provides a half-wavelength power transmission line power fluctuation overvoltage optimization control method and device. The half-wavelength power transmission line power fluctuation overvoltage is defined for the first time and the characteristics of the power fluctuation overvoltage are determined. Meanwhile, optimization control of the half-wavelength power transmission line powerfluctuation overvoltage can be finally realized through the auxiliary control strategy and the lightning arrester uniform configuration strategy and differential configuration strategy. The problem of half-wavelength power transmission system power fluctuation overvoltage can be effectively solved and safe operation of the half-wavelength power transmission system can be guaranteed. The durationof the power fluctuation overvoltage can be shortened by the auxiliary control strategy and the amplitude of the power fluctuation overvoltage can be reduced so that the absorbed energy of the lightning arresters along the half-wavelength power transmission line can be reduced, the configuration number of the lightning arresters along the half-wavelength power transmission line can be reduced, configuration of the lightning arresters can be optimized and the configuration cost of the lightning arresters can be reduced.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to an optimization control method and device for power fluctuation overvoltage of a half-wavelength transmission line. Background technique [0002] Half wave-length AC transmission (HWACT) refers to the ultra-long-distance three-phase AC transmission technology whose electrical distance of power transmission is close to a power frequency half-wavelength, that is, about 3000km (50Hz) or about 2600km (60Hz). Reactive power self-balancing, no need to install reactive power compensation equipment, no need to set up intermediate switch stations. It has strong power transmission capacity, good economy and reliability, and can realize long-distance synchronous networking. With the advancement of the Global Energy Internet, half-wave power transmission has attracted widespread attention as a solution for large-scale intercontinental power transmission. [0003] However, th...

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Problems solved by technology

[0005] In order to overcome the deficiency that the half-wavelength transmission system cannot operate safely due to the overvoltage of the half-wavelength transmission line in the prior art, the present invention provides a method and device for optimizing the power fluctuation overvoltage of the half-wavelength transmission line. The auxiliary control strategy of the half-wavelength transmission line and the uniform configuration strategy of the arrester, and determine the maximum absorbed energy of the arrester under the auxiliary control strategy and the uniform configuration strategy, and then determine the half-wave transmission according to the maximum absorbed energy of the arrester under the auxiliary control strategy and the uniform configuration strategy The differential configuration strategy of arresters along the line, and determine the auxiliary control strategy and the differential configuration strategy under the half-wavelength transmission line power fluctuation overvoltage, the duration of power fluctuation overvoltage and the maximum absorbed energy of the arrester, and finally judge the auxiliary control strategy and Under the differentiated configuration strategy, whether the power fluctuation overvoltage of the half-wavelength transmission line, the duration of the power fluctuation overvoltage and the maximum absorbed energy of the arrester meet the power fluctuation limit requirements at the same time. If they meet at the same time, optimize the differentiated configuration strategy, otherwise The differential configuration strategy is corrected to realize the optimal control of power fluctuation and overvoltage of half-wavelength transmission lines

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