| Nowadays, with more and more application of power charger-inverter, the requirements for its performance get improved. Correspondingly, some new topologies and control methods are presented. Digital control and intelligentize are the hotspots and trends of research of power converter system including power charger-inverter.This dissertation presents a novel design based on multiple structure, it is controlled by three MCU at the same time, and the sine wave is outputted with the superposition of three groups of square wave voltage rising through the output transformer with different turns ratios, and three turns ratios are interrelated.Chapter two introduces the operation theory of the power charger-inverter. Using the method of firing angle prediction, steady sinusoidal output voltage with low harmonic level can be generated. Validity of the proposed modeling and control methods is verified by simulation. Corresponding experiment results are shown in Chapter three.Now, the power system is developed toward high reliability and high power, so the parallel technologies of inverters or the parallel between power grid and inverters are required intensively. Using the same main circuit, a utility inter-active inverter is realized. Simulation and experiment results of this inverter are shown in Chapter four. |
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