Short Essay On Wind Power

OUTPUT POWER CONTROL OF A STAND ALONE WIND TURBINE THROUGH PITCH ANGLE CONTROL Bijaya kumar Mohapatra,

Dept. of Electrical Engg., Gandhi Institute for Technological Advancement,

Bhubaneswar, INDIA.

E-mail:[e-mail]

Abstract:Characteristics of wind energy is such that it varies randomly and the windmill output is proportional to the cube of wind speed, which causes the generated output power fluctuation in wind turbine generator (WTG). The generated output power fluctuation increases relative to the increase in installation capacity of the WTGs.So as to reduce fluctuation and variation in output different methods are available to control the pitch angle of blades of windmill. Pitch angle is maintained under limits through a

INTRODUCTION

The global electrical energy consumption is rising and there is steady increase of the demand on power generation. The existing conventional energy sources are depleting. So, alternative energy source investment is becoming more important these days. Wind electrical power systems are recently getting lot of attention, because they are most cost competitive, environmentally clean and safe renewable source.

Wind energy is a viable option to complement other types of pollution-free generation. In the early development of wind energy, the majority of wind turbines were operated at constant speed. Recently, the number of variable-speed wind turbines installed in wind farms has increased.In medium wind speeds, the generator and power converter control the wind turbine to capture maximum energy from the wind. Inthe high wind speed region, the wind turbine is controlled to maintain the aerodynamic power produced by the wind turbine.

Variable-speed generation is claimed to have a better energy capture and lower loading. Variable pitch control can be used to shed the aerodynamic power generated by the wind turbine. Thus, the aerodynamic power produced by the wind turbine can be controlled by adjusting the pitch angle of the wind