| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 99 === This thesis presents the analysis and design of battery energy storage systems for small wind power generation. The system can transfer the three-phase permanent-magnet synchronous generator from varying-voltage and varying-frequency to 60 Hz single-phase source, and the battery is used for energy storage and power compensation to compensate the natural irregularity of the wind power. The system uses three-phase full-bridge rectifier, which is low-cost and realized easily, to become the generator side power converter, to generate electric power over a wide range of wind condition along with wye-connected winding or independent winding. When the wind speed is low, the ac-dc power converter uses three-leg rectifier structure to raise the dc-link voltage. Whereas, when the wind speed is high, the ac-dc power converter uses six-leg rectifier structure converter to keep dc-bus voltage lying within the constant range. The proposed single-phase inverter can not only provide the power of the generator and the battery but also operate in either stand-alone or grid-connected fashion. Finally, a buck-boost dc-dc power converter is designed to charge and discharge batteries in order to regulate the power flow between renewable energy and system loads.
A high-performance digital signal processor TMS320F28335 is used to implement the control function to control the power converters. An experimental system is built. The system can provide single-phase ac 110V to single-phase load under stand-alone operation. The output of the effective power is 300W. Under grid-connected mode, the power converter supplies 330W with the corresponding efficiency of 90% using the topologies of three-leg and six-leg rectifier structures. Finally, experimental results are given to justify the analysis.
|
|---|
