2MW風力發電機無段變速液壓傳動控制之研究

Abstract

本研究旨在探討三種不同液壓無段變速傳動系統應用於2MW風力發電機，利用液壓系統替代傳統的變速齒輪箱系統，期望達到風力發電機於發電端能有穩定輸出功率的效果，以避免發電機於整流時損失的能源耗損。 本文分別建立不同的三種不同液壓無段變速傳動系統數學模型，分別是直驅式液靜壓傳動、迴授式液靜壓傳動以及迴授式液動壓傳動，利用MATLAB/ SIMULINK軟體進行動態模擬分析，以模擬系統傳動性能。並以模糊滑動控制器進行轉速控制器設計，最後，分別進行開迴路及閉迴路轉速控制模擬分析，以達到減輕風力發電機起動扭矩，並於變風速下也能有穩定轉速輸出的優良效能，模擬結果證實，在變速輸入、定速輸出上都可達到良好的變速控制性能。

The thesis aims to investigate three different types of hydraulic variable speed transmission system for 2MW wind turbines. Instead of the gear box, the hydraulic variable speed transmission system can achieve a steady rotational speed for the generator of 2MW wind turbine for avoiding the rectification and increasing the electric generation efficiency. The mathematical models of three different types of hydraulic variable speed transmission system, including the direct-driving hydrostatic transmission system, feedback-driving hydrostatic transmission system and feedback-driving hydrodynamic transmission system, are derived respectively. The dynamic simulation of the three systems is implemented via MATLAB/SIMULINK. For achieving the constant rotational speed control of generator, fuzzy sliding mode control is used for the controller design. Finally, open-loop simulation of the three transmission systems and closed-loop simulation of constant rotational speed control are performed for verifying the feasibility and the control performance.