Position Sensorless and Output Power Control of 5kW Brushless DC Generator in Flywheel Energy Storage System

• Main Authors: Chia-Yu Lin, 林家育
• Other Authors: Yuan-Chih Chang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/68618061753767142052

碩士 === 國立中正大學 === 電機工程研究所 === 101 === This thesis develops a 5 kW Brushless DC Generator (BLDCG) drive is being applied to the flywheel energy storage system (FESS). Since the BLDCG is generally operated at high and medium speed range in the FESS, the extended EMF method is suitable. In this thesis, the system configuration including the current control, position sensorless schemes and hardware circuit design of driver is introduced. The modeling and parameter estimation are performed for the design of current control and position sensorless control schemes. The derivation of the space-vector based feed-forward current D-Σ digital control and extended-EMF position sensorless control is accomplished. The position estimation and current control are implemented by the microcontroller. The estimation accuracy of the rotor speed and position is first verified . Then the performance of the proposed current control is validated by the measured current waveforms. Finally, the output voltage regulation under load variation and output power control under speed variation are achieved by the proposed voltage and controllers.