This paper describes a novel offline parameter identification technique, specifically for medium voltage interior permanent magnet synchronous machine driven by Cascaded H-Bridge inverter. Accurate identification of parameters is indispensable to correct decoupling of current loop in vector control. Unlike low voltage permanent magnet synchronous machines commonly driven by the conventional six-switch inverter, the proposed method specifically focuses on medium voltage applications and takes advantage of the topology of cascaded H bridge to tune machine parameters of resistance, d-axis inductance, q-axis inductance and magnetic flux linkage. By properly modifying the topology structure, the accuracy of identification can be improved with issues like voltage drop across semiconductor devices and low duty ratio considered. In the end, the paper presents simulation results using proposed technique, followed by theoretical analysis as proof of the feasibility of the proposed method.
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