| Summary: | 碩士 === 國立清華大學 === 電機工程學系 === 93 === Abstract
The application of single-phase DC to AC converters is quite popular. However, due to the limited voltage/current rating of power semiconductor components, the capacity of a single inverter is also constrained. A simple strategy to increase the output power capacity is by parallel operation of several inverters. In fact, the content of this thesis is focused on the research of parallel control techniques.
Basically, the major contributions of this thesis may be summarized as follows. First, a novel control strategy is proposed to enhance greatly the dynamic performance of a single inverter. Only simple proportioned controls are adopted for the voltage regulator and the current regulator as well as for the feedforward and feedback controllers. The enhanced dynamic performance can be observed clearly from the transient response to a nonlinear load. Second, based on the previous control, a novel parallel control strategy is proposed to achieve the goal of uniform sharing of the output current for each inverter. Again, in addition to the uniform current sharing characteristic, the merits of fast response and with zero steady state error of a single inverter control can be preserved for the compound system. Finally, a prototype system is successfully constructed by using a high speed digital signal processor, namely DSPTMS320F2812. Experimental results show that the proposed parallel control strategy can indeed achieve the desired performance.
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