Applicability Study on DC Transmission with Different Voltage Levels

doi:10.3969/j.issn.1000-7229.2015.09.004

Abstract

Abstract:

The economic transmission distance and capacity of DC transmission systems with different voltage levels serve as a guide in the selection of voltage level in actual DC transmission projects. The economic model of DC transmission system was built from four aspects of investment cost, maintenance cost, loss cost and transmission corridor depreciation cost. And the discounted cash flow model was adopted to calculate the comprehensive cost of DC transmission system. Taking a concrete transmission scenario with 1000 km transmission distance and 5 000 transmission power as an example, the comprehensive cost of DC project with different voltage levels was calculated, whose results were extended to other transmission scenarios to obtain the economic transmission applicable scope of DC transmission system with different voltage levels. Finally, the sensitivity analysis was carried out on parts of parameters that affected the economic transmission applicable scope. The results indicate that the DC transmission mode with high voltage is generally more economical along with the increase of transmission power and transmission capacity, and the electricity cost and equivalent annual loss time have significant influences on the economic transmission applicable scope of DC system.

Key words: DC transmission, voltage level, economic analysis, investment cost, maintenance cost, loss cost, transmission corridor depreciation cost

CLC Number:

TM 72

XU Zheng, CHENG Binjie. Applicability Study on DC Transmission with Different Voltage Levels[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(9): 22-29.

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