Optimization of a Three-Phase Coaxial 10 kV/1.5 kA HTS Power Cable for Balancing 3-Phase Current Distribution
Optimization of a Three-Phase Coaxial 10 kV/1.5 kA HTS Power Cable for Balancing 3-Phase Current Distribution
复制标题
用于平衡三相电流分布的三相同轴 10 kV/1.5 kA HTS 电力电缆的优化
DOI：
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发表时间：
2022
影响因子：
1.8
通讯作者：
Defu Wei
中科院分区：
文献类型：
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作者：
Qifan Yang;Jiahui Zhu;Panpan Chen;Yanfang Yang;Shichong Ma;Jingying Cao;Jiaxin Liu;Defu Wei
随着城市电网用电负荷的不断增加，常规电缆的升级面临着空间资源紧张的问题。三相同轴高温超导电缆具有结构紧凑、损耗低、高温超导带材用量减少近2/3等优点，为城市扩容提供了一种新的有前景的解决方案。但由于三相同轴高温超导电缆各相半径不同，影响了各相电磁参数的对称性，导致三相电流不平衡，降低了传输效率。基于多回路法，建立了三相同轴超导电缆的微分方程，通过数值计算三相电感和电容参数，得到了三相同轴超导电缆中电压和电流的瞬时变化规律。针对高温超导电缆三相电流不平衡问题，提出了一种新的两段式粒子群算法。该算法将C相导体和铜屏蔽层分为两段，两段半径相同，但节距和扭曲方向不同，使变量增加了一半。通过改变节距和缠绕方向，并考虑绝缘层厚度，实现了三相同轴高温超导电缆电流分布的优化。最后，我们设计了一个10 kV/1.5 kA的三相同轴高温超导电缆。结果表明，经过两段粒子群算法优化后，超导电缆的电流不平衡率从41%降低到1%。对三相同轴高温超导电缆的数学模型和不平衡优化算法进行了验证。优化结果为城网用三相同轴高温超导电缆的结构设计和实验研究提供了重要参考。
With the increasing power load of urban power grid, the upgrading of conventional cable is facing with the problem of space resource shortage. Three-phase coaxial high temperature superconducting cable has the advantages of compact structure, low loss, and nearly 2/3 reduction in the consumption of HTS tape, which provides a new prospective solution for urban expansion. However, due to the different radius of each phase of the three-phase coaxial HTS cable, the symmetry of electromagnetic parameters of each phase are affected, resulting in the imbalance of the three-phase current, which will reduce the transmission efficiency. Based on the multi-loop method, we establish the differential equation of three-phase coaxial superconducting cable in this paper, by calculating the parameters of three-phase inductance and capacitance by a numerical method, and obtain the instantaneous variation rule of voltage and current in the three-phase coaxial HTS cable. We propose a novel two-section Particle Swarm Optimization to solve the problem of three-phase current imbalance in HTS cable. The algorithm divides the C-phase conductor and the copper shield layer into two segments with the same radius but different pitches and twist directions, which increases the variable by one-half. By changing the pitches and winding directions, considering the thickness of the insulation, optimization of current distribution of three-phase coaxial HTS cable is achieved. Finally, we designed a 10 kV/1.5 kA three-phase coaxial HTS cable. The results show that the current imbalance ratio of the superconducting cable is reduced from 41% to 1% after the two-section Particle Swarm Optimization. The mathematical model and the imbalance optimization algorithm of three-phase coaxial HTS cable both are verified. The optimization results provide important reference for the structural design and experimental research of three-phase coaxial HTS cable for urban power grid.