Transmission Network Reinforcement for Wind Power Absorption in Ambewela-Sri Lanka.
Sri Lanka has huge wind resource. It has been proven by many local and foreign studies. According to those studies the Central Province has the best wind capability compared to other provinces. In this study Ambewela, Hare Park, Ratninda and Naula sites are identified as suitable locations for wind power extraction from Central Province, Sri Lanka. The 21MW wind power plants (WPP) for Ambewela, Hare Park & Ratninda sites and 4MW WPP for Naula are decided. NuwaraEliya, Badulla, Ukuwela and Naula 132/33kV Grid Substations are identified as suitable interconnection points for the above selected sites respectively. After detailed analysis of wind resource in the area Gamesa G97; 2MW & Leitwind LTW77; 1MW wind turbines are selected as most suitable for Central Province. The WPPs modeled in to the Sri Lankan Power System using Power System Simulation for Engineers (PSS/E) software and conduct the Load Flow Analysis, Single Contingency Analysis, Fault Level Calculation, PV & QV Analysis and Dynamic studies. By analyzing the results of above studies, it’s identified short term improvement as minor system improvements and long term improvements as major for better wind absorption into the Sri Lankan power System. Minor system improvements includes adding reactive power resources to identified locations, minor improvements in exiting transmission lines and increase reserve margin of the power system. Major system improvements includes redo the power system modeling using PSS/E software to represent the real situation of the power system and make improvements in planning procedure and criteria, conduct comprehensive voltage stability study and implement under voltage load shedding scheme. Further proposed introduce higher voltage backbone system or major improvements of existing 220kV backbone system, introduce more active and reactive power sources in suitable locations, implement group frequency controlling method, introducing new generation and bulk energy storage options such as Pumped Storage Power Plants which enhance the wind absorption limits into the power system.