- 學位論文
以擾動隨機近似法進行鼠籠式感應發電機之最大功率追蹤控制
MPPT control for squirrel-cage induction generation using perturbation stochastic approximation algorithm
摘要
本文針對風力發電系統提出最大功率追蹤法則，整體系統架構包含了伺服馬達、感應發電機、三相全橋式整流器、降壓直流轉換器和固定負載，並由傳統電流型擾動觀察法合併擾動近似演算法，進行Matlab/simlink 模擬與電路實作設計來完成最大功率追蹤。 於風力發電系統之最大功率應用上，雖然擾動隨機近似法和傳統比例積分微分控制，其所調整之輸出控制參數皆為責任週期，但擾動近似法，不需使用到風速計、轉速計和風力機之特性曲線資料，即可使感應發電機運轉於可變速度下之最佳轉速點。 根據實際電路與模擬結果，不論模擬風速與感應發電機轉速如何變化，只要在風力機額定運轉風速區間，藉由本文之最大功率演算法，調整最佳責任週期以達到最大功率追蹤。
並列摘要
This thesis focuses on maximum-power-point-tracking (MPPT) algorithm applying for wind-turbine generator system (WTGS). The system includes the serve-motor, induction generator (IG), three-phase full bridge rectifier, buck converter and fixed load. This thesis uses traditional Current Perturbation Algorithm as well as Perturbation Stochastic Approximation Algorithm to implemented with Matlab/simlink and hardware to achieve the maximum power tracking. To apply the maximum-power-tracking-algorithm in the wind-turbine generator system, the controlled parameter is the duty cycle of the converter. This present method does not need an anemometer, rotation encoder and characteristics of wind-generator. The proposed method enables the induction generator to operate at variable speeds to achieve good performance. It can be found that, no matter how the wind speed changes, by varying the speed of the induction generator via adjusting the duty cycles of converter, the proposed method can achieve MPPT, if the wind-turbine generator is operated in its rated range.