Study on Benefit Evaluation and Planning Process for Expansion of Transmission System

• Main Authors: Li Dong Sheng, 李東昇
• Other Authors: Shi-Lin Chen
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/27838352532443118074

碩士 === 國立清華大學 === 電機工程學系 === 93 === Nowadays the liberalization of electric power industry has become the trend of power industry structures in developed countries ,and its purpose is to bring in competition mechanism. For improving competitiveness, transmission departments have to raise their operation efficiency, including costing-down investments and choosing high-return investments. Therefore, the implementation of the benefit/cost evaluation on the investment plan is more needed ever than before during the drafting of the investment plan. In the past, transmission or network companies were regionally monopolized, and thus had less incentive to improve their operation and also investment efficiency. Besides, what these companies offered are transmission service, not electricity produced, in most occasions, and they do not sell electricity directly to the customers. It is difficult to estimate an appropriate revenue to account for their service offered, so to evaluate the cost/benefit of transmission and substation (T&S) investment plan. This thesis intends to propose a numerical model with the effective measures of the cost/benefit evaluation for the need of liberalization of electric power industry nowadays. For those countries which are still not liberalized, the numerical model can be an important reference material as well. This research consists of three parts: first, to make discussion and compare with the evaluation processes of T&S investment in KEPCO, Transgrid, Powerlink and Western Power Electric Company in Australia. The second part proposes the estimation method of T&S investment plan with necessity analysis and benefit/cost calculation. In necessity analysis, the transformers’ average utilization ratio in peak hours for each power supplied district is selected as the index to evaluate the necessity of power substation expansion. As for the benefit/cost calculation, the increment of power supply capacity, the reduction of network loss and the improvement of power supply reliability are taken as the three key evaluation indices which are converted into the currency to clearly measure the project benefit. The last part is to evaluate Taipower’s sixth T&S investment plan with fore-mentioned methods to ensure that they are feasible.