Novel methodologies for electromagnetic characterization of complex power cable systems situated in realistic environment

提出的研究项目集中于开发嵌入到现实环境中的复杂送电电缆的电磁特性的新方法。在其他方面，环境的影响包括土壤流失的存在、附近物体(例如埋地管道)的可能接近、由于湿度水平的季节性变化而导致材料参数的复杂空间变化。该方法基于申请人最近开发的新的电磁分析方法，并利用表面-体积-表面(SVS)电场积分方程(EFIE)的边界元离散。以前，该方法用于描述均匀环境中的二维(2D)电力电缆。该项目的重点是对真实电力电缆建模的两种重要影响：(1)将SVS-EFIE推广到三维(3D)。这种3D模型对于考虑电缆中的弯曲、附近物体的存在以及导致其特性改变的其他不连续性是必不可少的；(2)在电力电缆模型中纳入土壤效应。由于各种输电线路都以埋在土壤中的电缆为特征，纳入这种影响将大大提高通过模拟进行的电气性能预测的准确性。拟议的项目是马尼托巴省高压直流研究中心和奥赫马托夫斯基博士在马尼托巴大学的研究小组合作的第二阶段。在之前为期3年的合作研究项目中开发的算法和软件已集成到由马尼托巴省高压直流研究中心开发和维护的PSCAD商业电力系统分析软件中。该软件被70个国家的1万多名用户使用。在拟议的研究项目成功完成后，相关的计算模型将被集成到PSCAD软件中，并进一步提高其精度。PSCAD的新功能将帮助加拿大各地的电力系统工程师设计更高效的电力传输系统，最终降低数百万加拿大人的电力输送成本。

The proposed research project focuses on development of novel methodologies for electromagnetic characterization of complex power delivery cables embedded into realistic environment. Among others, the effects of the environment include presence of the lossy soil, possible proximity of nearby objects (e.g. buried pipes), complex spatial variation of material parameters due to seasonal variation of moisture levels. The proposed approach is based on novel electromagnetic analysis methodology recently developed by the applicants and utilizing boundary element discretization of Surface-Volume-Surface (SVS) Electric Field Integral Equation (EFIE). Previously the method was developed for characterization of two-dimensional (2D) power cables situated in homogeneous environment. The emphasis in the proposed project is on the two types of important effects attributed to modeling of realistic power cables: (1) Generalization of the SVS-EFIE to to three-dimensions (3D). Such 3D models are essential to accounting for bends in the cables, presence of nearby objects, and other discontinuities causing the change in their properties; (2) Incorporation of the soil effects into the power cable models. As a wide variety of the power transmission lines feature cables buried in the soil, inclusion of such effects substantially increases the accuracy of electrical performance predictions done through simulations. The proposed project is Phase II in the collaboration between the Manitoba HVDC Research Center and Dr. Okhmatovski's research group at the University of Manitoba. The algorithms and software developed in the prior 3-year collaborative research project have been integrated into PSCAD commercial power systems analysis software developed and maintained by the Manitoba HVDC Research Center. The software is used by over 10,000 users in 70 countries. Upon successful completion of the proposed research project pertinent computational models will be integrated into PSCAD software and further improve its accuracy. New capabilities of PSCAD will aid power systems engineers across Canada in designing more efficient power transmission system ultimately reducing the cost of power delivery to millions of Canadians.