Biogeography-based algorithm for high voltage electrode surface optimization of a single-phase GIS bus terminal

Abstract

A new method applying the biogeography-based optimization (BBO) technique is presented for the optimization of high voltage electrode surfaces. The aim is to obtain the optimization of the electrode shape in order to achieve a uniform field distribution along the surface of the electrode and maintain maximum field stress at minimum value. The principle of the developed optimization technique is described with an axi-symmetric single-phase GIS bus terminal electrode considered as a quarter-ellipse. In this scheme different aspects of the optimization technique are compared by means of semi-infinite line charges and ring charges to compute the electric field with the charge simulation method (CSM). The new Biogeography Based optimized approach helps in achieving a uniform field distribution with a minimum electric stress on the electrode surface and a minimum deviation angle for the otherwise normal stress vector, holding the assignment factor within the assigned range. The deviation angle is the more sensitive indicator of the simulation accuracy .The assignment factor has an impact on simulation accuracy. The combined BBO/CSM algorithm is capable of finding a better-quality solution, better accuracy, better convergence characteristics and computational efficiency.

Keywords

• biogeography-based optimization
• charge simulation method
• semiinfiniteline charges
• ring charges
• deviation angle
• assignment factor