DC-link Stability and Modeling of Inverter-IM Vector Control System Based on LTP Theory

This paper constructs a model of inverter-induction motor (IM) vector control system based on linear time-periodic (LTP) theory. The basic contents of the LTP theory are firstly presented for illustrating basic modeling ideas. Compared to the traditional linear time-invariant (LTI) model, the LTP model considers the coupling effect between input and output signals. Afterward, the small signal model of the inverter-motor system is constructed, where the coordinate transformation and the effect of SVPWM have been taken into account. Moreover, the accuracy of the model has been verified according to signal reproducing and BODE diagram. Simulation results have confirmed the accuracy of LTP modeling of inverter-induction motor (IM) system and theoretical analysis of DC-link stability.

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