การติดตั้งสายส่งกระแสตรงแรงดันสูงเพื่อจำกัดขนาดกระแสลัดวงจรของระบบส่งในเขตเมืองใหญ่โดยพิจารณาดัชนีเสถียรภาพเชิงแรงดัน / สุชัยรัตน์ ต้องศิริ = HVDC line installation for short circuit current limitation of a transmission system in metropolitan area considering voltage stability index / Suchairat Tongsiri
Nowadays, the growth of economy and society has become a major factor driving for higher electricity demand. In order to fulfil this, the capabilities of electric power generation and transmission need increasing rapidly. In turn, these may cause excessive short-circuit currents, which in some case, may become larger than an interrupting capacity of protection equipment. Most metropolises thorughout the world encounter this same problem, including Bangkok and its vicility area. This thesis proposes a method for determining optimal location of a HVDC line together with at most one bus splitting, to limit short-circuit currents of the buses within a transmission system serving loads within Bangkok metropolitan area. The objective function is to minimize the size of HVDC with the constraints of circuit breaker short-circuit capacity limits as well as the operating constraints such as voltage and line flow limits. The Tabu Search has been applied to help find the optimal solution. Following which, security of the reconfigured system has been assessed by PQ Voltage Stability Index and the N-1 contingency test to reassure that it falls into an acceptable range.
