Reliability assessment for taipower's composite system‐case studies

Abstract

This paper studies the reliability assessment of Taiwan Power Company's (Taipower's) system. The systems for the years 2003 and 2006 are investigated in accordance with the existing N‐1 and N‐2 planning criteria. The reliability assessment is achieved by both the power‐flow based deterministic analysis and the Markovmodel based probabilistic analysis. It is found that the reliability of the system will be enhanced in 2006 compared to the system in 2003 due to the sixth transmission and substation project. This paper also explores the generalized N‐1 and N‐2 contingency criteria by taking generator, transformer, or transmission outages into account. In addition, the possibility of raising the N‐1 and N‐2 contingency criteria to the level of N‐2 and N‐3 contingency criteria is considered. It is found that the N‐2 criteria are stricter for the 161 kV transmission system while the 345 kV transmission system is still robust and conforms to the N‐3 criteria in 2006. Furthermore, the sequential N‐1–1 and N‐1–2 contingencies are less severe than the simultaneous N‐2 and N‐3 contingencies.