| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 101 === This thesis aims to develop a single-phase grid-connected battery energy storage system for bi-directional power regulation. Overall system consists of four-arm type battery module buck-boost dc–dc power converter and single-phase full-bridge dc-ac power converter. Four-arm type buck-boost dc power converter performs boost and buck functions, respectively, for battery charging and discharging, resulting in wide adjustment for the input and output voltages. Continuous conduction mode for each arm is maintained through dc power converter and its input inductors. Reduction in current ripple is achieved with interleaved pulse-width modulation and equal-current control. In addition, feed forward compensation and power compensation control strategy are used for inverter to improve the transient response speed, reduce the steady state error, and complete the grid-connected system with the closed-loop control of dc link voltage and ac inductor current.
In this thesis, a high-performance digital signal processor, TMS320F28035, is used as the control core. The system is administered by software control strategy in order to achieve the digital control to increase the stability and reliability. This system is integrated into two modes: the battery discharges output power of 1kW to the grid, the overall system efficiency is 85%, the current total harmonic distortion of inverter is 5.18%; in battery charging mode, input power is 300W from grid, the overall system efficiency is 81%, and the corresponding total current harmonic distortion of inverter is 7.61%. Experimental results validate the feasibility of theoretical analysis and control strategy.
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