| Summary: | 碩士 === 國立雲林科技大學 === 電機工程系 === 103 === A bi-directional inverter with two operating modes: grid connected inverter and power factor corrected converter is proposed and implemented in this paper. The volume and cost of the proposed circuit would be reduced. The digital controller implemented in a microcontroller unit (MCU) is more flexible to be modified and easier to be updated compared with conventional analog controller. In the inverter mode, it can provide grid connection function. In the converter mode, it includes a power correction (PFC) function. The proposed scheme in this paper is suitable for house uninterruptible power supply or contract capacity compensation.
The MCU build in analog to digital converter is used to sample the input and output voltage and current, and then a proportional and integral controller is executed in real time. Next, the build in pulse width modulation (PWM) peripheral is used to perform the peak current control PFC. The processes of circuit design and control software are described in the paper. Finally, a 1KW bi-directional inverter is implemented to verify the proposed system workable.
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