| Summary: | 碩士 === 國立雲林科技大學 === 電機工程系 === 105 === Due to the demand of power consumption is increasing, renewable energy technology is developed in every country. A three phase bidirectional structure is developed in this paper, which includes three modes: one is a grid connected inverter, another is a power factor corrector converter, and the last is an uninterruptible power system. Moreover, the paper also considers the situation when this system operates in grid connected mode but the sudden grid fault, the passive island detection method is developed to detect the island phenomenon. This method is able to discover grid fault and turn off the grid-connected output immediately.
The paper use bidirectional structure to reduce the circuit size and cost, and adopted Renesas Electronics' microcontroller RX62T for digital control. The MCU is used to detector the zero crossing point of grid and sense the voltage and current, then calculate and output the suitable switching control signals. Grid connected and power factor corrections are performed by the division-summation control method; Uninterruptible power system is implemented with sinusoidal pulse width modulation and a PI controller.
The operating principle of circuit, algorithm derivation, hardware and software are detailed in this paper. And, a 10kW three-phase four-wire half-bridge bidirectional inverter is implemented, the experimental results show the hardware and software design of this paper is workable.
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