INVESTIGATION AND IMPROVEMENT OF DYNAMIC STABILITY IN ADAMA-I WINDFARMS BY USING STATCOM

Abstract

Dynamic stability refers to the ability of the wind farm's power generation and grid connection system to maintain stable operation during disturbances. The purpose of the investigation was to analyze and improve the dynamic stability of Adama-I wind farms by integrating a Static Synchronous Compensator (STATCOM) system. During dynamic stability integration and improvement duration time of fault scenario 14.0-14.2sec.The 34 wind turbines of Adama-I windfarm are divided into three clusters, each with 10, 12, and 12 turbines. This reduces complexity and saves time compared to modeling the entire windfarm as individual turbines. Each cluster is modeled with its own 0.62/33kV rated unit transformer and the wind farm is connected with the grid through a 33/132kV 60MVA rated main transformer. The size of dq-theory based controller STATCOM was found as 3MVAR to be integrated as the plant’s reactive power requirement. Based on MVAR size, the DC link capacitor is found as about 1.125mF. The LG-fault, LLG-fault, and LLLG-fault are considered to happen in cluster two. During LG fault the system withstands its effect with less bus voltage than 0.95pu. During LLG-fault, cluster two becomes tripped and the remaining clusters provide the supply. During LLLG fault, all three clusters do not withstand the effect and all become down. During this time the grid supports the system. However, with the help of 3MVAR-rated STATCOM, all the dynamic stability problems related to the 33kV bus voltage becomes solved effectively. During the LLG fault, the 33kV bus voltage reaches about 0.65pu and 0.85pu without and with the STATCOM scenario respectively. During the LLLG fault, the 33kV bus voltage becomes 0.4pu and 0.9pu for without and with STATCOM scenario. However, during fault conditions, the system experiences disruptions and these disturbed systems are then resolved using STATCOM (Static Synchronous Compensator) to improve the overall system conditions