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is a lecturer in the Electrical and Biomedical Engineering Department at the University of Vermont. She received her PhD form the University of Texas at Dallas in December of 2017. Cosoroaba was a research assistant in the Renewable Energy and Vehicular Technology (REVT) Laboratory and a teaching assistant at UT Dallas. Her expertise lies in electric machines and design, multiphysics simulations, and magnetohydrodynamics and its possible use for emission free power generation. Dr Cosoroaba's current research interest is engineering education with focus on mastery learning, the effect of social networks in the classroom on student learning and efficient implementation of active learning.

This paper proposes a voltage control method based on virtual resistor and proportional voltage feedback loop for cascaded DC-DC converters. The closed-loop DC-DC converter would act as negative impedance load for the front-end converter and might lead to system instability. Based on the analysis of DC-DC converter with distributed parameters, a modified voltage control strategy based on virtual resistor is proposed which is to only add a proportional feedback of inductor current in the control block. Thus, no extra power loss would be generated. However, under some conditions, this method cannot achieve system stabilization. Then, an additional output voltage feedback loop is introduced which can not only stabilize the system under different cases but also improve system performance. Experimental results verified theoretical analysis and feasibility of the proposed control methods.