고장사례 분석을 통한 제주 풍력발전 단지운영 개선방안

Abstract

In this thesis, failures of three wind farms in Jeju island were analyzed by general classification related to mechanical issue, electrical issue, and control issue. Therefore, the improvement strategies of wind turbine operation were presented. These improvements were conducted by analyzing the failure from significant contributor of blade, generator, wind direction tracking system , and etc. The failure analysis data were divided into different operation area and periods - A area (from 2004 to 2014), B area (from 2010 to 2014) and C area (from 2011 to 2014). Technically, all cases of failure were conceptually classified according to all failures in maintenance list and business report of wind farm of Jeju island. However, the failure in cases of either automatic stop after restarting or minor reset were excluded in this analysis. As a result of failure analysis in each operation area, frequent failure field and facility express different patterns. Generally, in case of A operation area, the frequent of mechanical issue is higher than electrical and control field. In contrast, in cases of B and C area, it shows the opposite pattern compared to A area. Moreover, as a result of failure cases analysis of facility, blade system failures frequency appears relatively higher than other facilities in all area (A, B and C). Through the failure cases analysis, the improvement plans of wind power operation involve in spare part preparation, constructed monitoring system and the necessity regular maintenance in all wind farms commonly. Improved manifold material, changes of wind direction and gauge type , improvement of nitrogen filling method for accumulator, main transformer room restructuring, exhaustive management oversight in design and construction were obtained in each wind farm area. In cases of spare part preparations, among the most frequent facilities system, items with high frequency of failure was efficiently set in priority because it is impossible to prepare all required maintenance spares practically. Based on the improvement plan of wind power operation through failure cases analysis of wind farm, the annual-average capacity factor of wind generator and entire wind farm were respectively used to evaluate values of economic feasibility. Moreover, the power generation amount for calculating the amount of electricity sold was referred to SCADA database. It is confirmed that capacity factor improvement of 2.23%, 2.12%, and 2.53% for A, B, and C area, respectively, can be reached by applying improvement plan. We also investigated sales amounts of generated power, it was determined that the net profit could be obtained further as 1,702, 2,190, and 954 (one million won) for A, B, and C area, respectively.