In this research, we lay out a model to estimate the effect of rainfall by simulating the actual physical processes of the rain drops forming on the surface of the blades of a vertical-axis wind turbine (VAWT), thereby determining optimal wetness, then power and performance respectively. This could have an effect on the control strategy necessary for designing and controlling wind turbine. | A method to analyze power output of vertical-axis wind turbines under rain Vietnam Journal of Science and Technology 56 (6) (2018) 761-771 DOI: A METHOD TO ANALYZE POWER OUTPUT OF VERTICAL-AXIS WIND TURBINES UNDER RAIN Nguyen Tuan Anh, Nguyen Huu Duc Department of Renewable Energy, Faculty of Energy Technology, Electric Power University, 235 Hoang Quoc Viet, Ha Noi * Email: ducnh@ Received: 12 April 2018; Accepted for publication: 13 June 2018 ABSTRACT A method to analyze effect power output of a vertical axis wind turbine under rain is proposed. The rain had the effect of increasing the drag, slowing the rotational speed of the wind turbine and decreasing the power and performance. More and more ambitious projects for wind turbine production being set on many where on Vietnam, it is necessary to understand all the factors, especially by weather changes, that might affect wind power production. In this research, we lay out a model to estimate the effect of rainfall by simulating the actual physical processes of the rain drops forming on the surface of the blades of a vertical-axis wind turbine (VAWT), thereby determining optimal wetness, then power and performance respectively. This could have an effect on the control strategy necessary for designing and controlling wind turbine. Keywords: horizontal-axis wind turbine; effect of rain; power decrease of wind turbine. Classification numbers: ; 1. INTRODUCTION Worldwide development of wind power is raising with the increased demand for renewable energy. Rain is a widespread phenomenon in many parts of the world, and Vietnam is in a zone of high precipitation, so in order that more and more ambitious projects of wind turbine generation being set nowadays can be realized, it is necessary to understand the effect of rain and rainstorm on the power and performance of wind turbines. This will provide .
