Peng Li , Dawei Zhang , Mengfei lei , Pan Xiao , Tian Wu , Chunhua Fang , Ziheng Pu
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引用次数: 0
Abstract
Icing disasters on overhead ground wires of ultra-high voltage direct current (UHV DC) transmission lines, influenced by micro-meteorological conditions in frozen snow weather, have occasionally resulted in accidents like ground wire disconnection and tower collapse. To improving the ice-melting efficiency of the overhead ground wires with normal working conditions, a new segmentation method for ground wires under ice-melting condition by adopting the electromagnetic transient joint simulation was proposed. Based on environmental conditions, the voltage and capacity required for ice-melting were automatically calculated by adjusting the pulse trigger angle of the ice-melting device, and then the number of ground wire ice-melting segments was determined, thus leading to the proposal of a ground wire segmentation ice melting scheme. Simultaneously, the impact of ice thickness and wind speed on the ice melting voltage was analyzed, and the effectiveness of the segmentation method was verified by the actual ±800 kV transmission line. The results show that the proposed method can automatically determine the ice-melting voltage based on environmental conditions, significantly improving accuracy over traditional empirical formula method. Ice thickness greatly affects the ice-melting voltage. By considering actual environmental conditions, ground wire icing conditions, and parameters of the ice-melting device, rapid design of segmented insulation for overhead ground wires can be achieved.
期刊介绍：
Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview.
• Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation.
• Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design.
• Substation work: equipment design, protection and control systems.
• Distribution techniques, equipment development, and smart grids.
• The utilization area from energy efficiency to distributed load levelling techniques.
• Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.
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