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In this paper, a unified graphical modeling technique is developed for investigating the behavior of pulsewidth- modulated three-phase inverters. By introducing the virtual- switch concept together with its virtual switching function, it is seen that the existing attractive switching flow-graph modeling technique for dc-to-dc converters can be extended to three-phase inverters without losing its merits. The corresponding large- signal, steady-state, and small-signal models can then be also obtained easily. Some examples, implemented easily with MATLAB/ Simulink, are also given to demonstrate the feasibility of the proposed technique.
Liao et al. (2008) studied this question.
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