| Summary: | 碩士 === 國立臺灣大學 === 電機工程學系研究所 === 86 === This thesis describes the design and implementation of two types of fully
digitalized controlled single-phase inverters. The voltage-controlled inverter
can be used for uninterruptible power systems while the current-controlled
inverter can be used as utility interface for photovoltaic energy systems.
Comparing with the above systems on the market under analog control, the
proposed systems under fully digitalized control implemented by a low-cost
microprocessor 80196MC feature hardware simplification, reliability
enhancement, and programmable capability.
The design processes and considerations of the circuit elements in both
types of inverters will be presented. The closed-loop feedback with a
sinusoidal reference is used to reduce the harmonic distortion, and the
effective value of the output can be kept constant under different loads
by adjusting the amplitude of the sinusoidal reference. Using the zero-
crossing signal of the output, we can adjust the phase of the sinusoidal
reference to synchronize the output and the utility. Experiment results
under a 1KW load test show the effectiveness of this system.
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