Simulation model for reducing frequent actions of lightning arresters

Abstract

The invention discloses a simulation model for reducing frequent actions of lightning arresters. According to the invention, an operation mode of a direct-current power transmission system with a voltage of + / - 500 / 800kV is determined, and all equipment and line parameters in a converter station are combined; an internal overvoltage electromagnetic transient simulation model of the direct currentsystem is established based on PSCAD; the actual switching-on capability of a circuit breaker is counted and analyzed; the maximum closing phase angle which can be borne by the circuit breaker and themaximum stress requirement of the lightning arresters are determined; the key equipment of the converter station and the maximum bearing parameters of the lightning arresters are simulated and analyzed under different fault working conditions of an alternating-current filter bank; whether the critical closing phase angle of the circuit breaker and the stress of each lightning arresters meet requirements or not are analyzed; and the volt-ampere characteristic curve of the lightning arresters is raised. The beneficial effects of the invention are that the method can improve the critical switching-on phase angles of the lightning arresters through the building of the overvoltage electromagnetic transient simulation model in the DC system on the premise that the insulation level of equipmentis not changed, can effectively reduce the operation frequency of the lightning arresters during the switching of AC filters, and improves the operation reliability of the system.

Description

technical field [0001] The invention relates to the technical field of electric power, in particular to a simulation model for reducing frequent actions of lightning arresters. Background technique [0002] Most of my country's power energy is distributed in the west, while the main load is concentrated in the central and eastern regions, showing the characteristics of "separation of source and load". This requires my country's power transmission to achieve long-distance, cross-regional, and large-scale transmission. With the maturity of high-power power electronics technology, high-voltage direct current transmission has become the current development of our country because of its advantages such as low line cost, long transmission distance, small power loss, and the ability to connect two AC grids with different frequencies without increasing short-circuit capacity. Main engineering technology. The converter station is an important link to realize the conversion of AC and...

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention proposes a simulation model to reduce the frequent actions of arresters, which mainly solves the problem of frequent actions of arresters in DC transmission systems

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