四分裂导线在750 kV输电线路中的应用研究

导线的选择和排列方式是输电线路建设中的重要课题。对四分裂导线在750 kV线路工程中的应用进行深入论证，综合分析和比较其电气性能、机械性能和经济性能。研究结果表明，在海拔较低、电晕损耗较小的地区，铝截面相当的四分裂扩径导线也可以满足电磁环境限值要求，且初期投资小，长期运行经济性与六分裂导线相当，对降低工程造价有很重要的意义。

Application of Quadri-Split Conductors in 750 kV Transmission Lines

Selection of the conductor is important in the design of power transmission lines. This paper demonstrates possibilities of using quadri-split conductors in 750 kV trans-mission lines, including comprehensive analysis and comparison of its electrical properties, mechanical performance and economic performance. The study results show that in the areas of lower altitude and smaller corona loss, the quadri-split conductors with the adequate aluminum cross-section meet the electroma-gnetic environment limits, reduce the preliminary investment, and their long-term operation economy are equivalent to those of the six-split conductors, therefore help substantially to reduce the project cost.In view of the discreteness and multiple-constraint nonlinearity in the reactive power optimization for the power system, this paper proposes a reactive power optimization method based on Chaos Quantum Immune Algorithm（CQIA）. The algorithm uses quantum bits and chaotic variables produced by Logistic mapping to initialize optimization of quantum antibodies to ensure the traversal optimization and searching efficiency of the algorithm. Antibody clonal amplification and mutation are implemented by the quantum revolving door and quantum antibody is reflected from the unit space to the solution space of optimization by using the linear transformation. Simulation results of the IEEE30-bus system show that the proposed algorithm is feasible and effective.