Operation and assessment of wind energy on power system reliability evaluation

• Main Author: Shi, Shuai
• Published: University of Strathclyde 2014
• Subjects: 621.3
• Online Access: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629032

Power companies around the world are incorporating wind power into their electricity networks. Wind power is an intermittent source of energy and its technical and financial impacts on the transmission and distribution networks are not yet totally investigated. This thesis investigates the impact of wind power on power system reliability evaluation. The investigation includes long-term system planning and short-term operational planning on reliability evaluation taking into accounts different penetration levels of wind power. This thesis presents a Wind-Hydro Cooperation (WHC) method for reducing the effects of wind power fluctuations on system operation and maintaining similar power system reliability level at different wind penetrations. The thesis starts by gaining insights into methodologies of power system reliability evaluation. These methodologies are described and discussed in details. Then, relations between the wind speed and the wind turbine power output are explored fo r modelling the wind farm output. The output fluctuation of wind power affects the power system operation. The system requires additional operating reserve to maintain the original system reliability. To mitigate these effects of wind output fluctuation, the study explores the use of Pump-Hydro technology to cooperate with wind power to meet the increased operating reserve requirements. In order to verify and analyze the validity of the WHC method on reducing the effect of wind power fluctuation on power output and maintaining the system reliability, an extensive set of case studies are performed. Following this, the reliability analyses focus on three aspects: a) a small system for initial validation of the idea; b) a larger system for analysing the effects of the WHC method on long-term system planning and short-term operational planning; c) application of a real practical system. All the above tests involve investigation of wind penetration at different level starting from 10% to 40%. The period of investigation ranges from one day, one week, one month and then extending it to one full year.