| Summary: | 碩士 === 國立交通大學 === 電控工程研究所 === 106 === An asymmetrical (2N+1) level flying-capacitor converter is presented in this thesis to construct a bidirectional AC/DC converter. Compared with conventional double loop control structure, the proposed control structure only requires input voltages and output voltage to achieve power factor correction amd regulate the output voltage. If there is a generated system connected to the dc bus,and the generated power is greater than the dc load, the proposed control structure must return superfluous power to the grid.Otherwise,the flying-capacitor voltage balancing loop is including in the control structure,which can improve the speed of flying-capacitor voltage balancing.
At the end,all the algorithms are implemented in a FPGA(Field Programmable Gate Array). The simulation and experimental results will show the well performances of the proposed current sensorless control structure. The simulation and experimental results could also show the well performancesof the ying-capacitor voltage balancing loop,which can improve flying-capacitor natural balancing performance.
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