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A hybrid system model is given for the power grid side converter based on hybrid system theory. This converter is part of the excitation source of the double-fed induction wind power generator. With space vector pulse width modulation method, we take the modulation of a space voltage vector in the third sector as a typical example; analyze the modulation process of the approximation of the three shared zero vector method through hybrid automata theory; device the state equations of continuous-time systems, staying condition set, discrete state transition set and transition guards. A new analysis approach of the three-phase power electronic circuits through hybrid system theory has been presented.