Reliability and Economic Evaluation of the China Southern Power Grid

The China southern power grid is now the only long-distance and huge capacity power system with AC and DC transmission lines in parallel in China. The reliability and economic evaluation of it is carried out based on the reliability evaluation software package TPLAN. By calculating the system reliability indices, we get an overview of the reliability of the China southern power grid, and draw the conclusion that its severity grade is Grade 2. By calculating the area and load bus reliability indices, we draw the conclusion that Guangdong province is the most unsubstantial part of the China southern power grid. In order to improve the reliability of the China southern power grid, we should pay special attention to improving the reliability of Guangdong province first. The conclusion is confirmed by the economic analysis of the China southern power grid based on the concept of CCDF. Once the algorithm is selected, the statistic data will affect the results greatly. In this paper, the sensitivity of evaluation results to statistic data is studied. Works done in this paper are particularly valuable for later planning and operation of power systems in China