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This paper presents a new, optimized PWM scheme and control approaches for a three-level two-quadrant chopper in a superconducting magnetic energy storage (SMES) power conditioning system (PCS). It solves the trickle charging and discharging issues related to the SMES coil, and gets wide system bandwidth for bi-directional operation. Experimental tests verified the effectiveness of the presented methods.
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Peng et al. (2002) studied this question.
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