Assessing the Impact of Advanced Technologies on Utilization Improvement of Substations

Abstract

-The smart substation is the heart of a transmission system, which is particularly emphasized as the most significant composition of smart grids in China. In order to assess the functionality performance of substation technologies, this paper presents methods used to identify the most promising solutions for smart substation design and to evaluate the technical levels of available technologies. The multi-index optimization model is presented to address the issue of smart substation planning. A mathematical model of the planning decision problem is established with multiple objectives consisting of economic, reliability, and green key indices, and many kinds of concerns including physical and environmentally friendly operations are formulated as a set of constraints. With respect to the assessment of the technical level regarding integration of advanced technologies into a substation, a modified grey whitenization weight function is adopted to structure a novel grey clustering method. The proposed grey clustering approach is used to overcome the difficulty of insufficient quantitative assessment capacity for traditional methods. The evaluation of technical effects provides the classification definition for the development phase and the maturity level of the smart substation. The effectiveness of the proposed approaches in planning decision-making and evaluation of construction efforts is demonstrated with case studies involving the actual smart substation projects of Wenchongkou substation in China Southern Power Grid (CSG) and Mengzi substation in State Grid Corporation of China (SGCC).

Onsite Detection Technology and its Application for Electric Cable Partial Discharge

“…The problem can be found in the bud, effectively extending the useful life of equipment and reducing equipment operation and maintenance costs reasonably. Currently, the arrester full current and the resistive current detection technology, the capacitive device dielectric loss and capacitance detection technology, transformer body oil dissolved gases, partial discharge monitoring technologies and transmission lines infrared detection technology is relatively extensive [6,7]. With the universal application of the electric cable in the city grid construction, the demand of improving electric cables detection methods is increasingly urgent, especially of live detection.…”