Stability and Performance Analysis of Passive and Active Stall Control of Small-Scaled Wind Turbine System by Phase Plane Method

摘要

The aim of this study is to reduce the angular velocity by controlling the stall factor even in storm condition. In this paper we intend to analyze the stability of angular velocity of small-scaled-wind turbine by phase plane method. Moreover, performance of angular velocity is evaluated by phase plane method. So far in the previous researches in order to determine the stability and evaluate the performance of nonlinear system time response of long term had been observed. However, since pitch angle and angular velocity are significant factors of stability and performances, observation is an inadequate approach for certain analysis. Therefore, phase plane method is proposed to increase the analysis degrees of stability and performances simultaneously. The mathematical model of small scaled wind-turbine is considered to be a non-linear differential simultaneous equation. Stall Control is applied by implementing the shock absorber in the conjunction of blade and the turbine. Moreover, axis friction control is loaded to decrease the excessive revolution. The stability and performance of turbine is examined by several condition of stall factors. Eventually, we confirm the simplification of analysis for non-linear system.