Wind Farm Simplified Dynamic Model and Control Strategies for Variable Speed Wind Turbines

• Main Authors: Chie-CheSun, 孫智哲
• Other Authors: Le-Ren Chang-Chien
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/93633651091048019200

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 100 === With the highly development of wind generation system, the demand of large-scale wind farms is increasing dramatically. Due to the intermittent characteristic of wind energy, the fluctuation of output power may inevitably impact the power system. For reducing the uncertain challenges on the operation stability of power system, proper controls are indispensable. In this thesis, two proposed operating strategies are proposed to control power output of the PMSG type wind turbines. Rotor Speed Control (RSC) strategy has a good performance on keeping constant power output by using its rotating inertia as a energy buffer. Peak Power Control (PPC) strategy provides a smooth power output with less wear and tear on drive train. Nowadays, wind farm behavior is difficult to study or analyze because of the complexity of wind turbine models. In this thesis, a reduced WTG model for variable wind speed is proposed. Based on the reduced WTG model, a reduced wind farm model, which is called lumped model, is further constructed. The lumped model still keeps essential components of wind turbine, PMSG, rotor inertia and pitch angle controller so that important features of wind turbine are still well retained. Finally, the lumped model is compared with the detailed model by several simulation tests. To validate the effectiveness of the lump model in portraying the dynamic output of wind farms.