Faculty Publications

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Author: search.filters.author.Balasubramanian, B.Subject: search.filters.subject.Hysteresis control

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    A Novel Bi-Directional Converter for Electric Vehicle to Grid Applications
    (Institute of Electrical and Electronics Engineers Inc., 2020) Deepak, P.; Damodaran, R.; Balasubramanian, B.; Mudlapur, M.
    This paper presents a power converter system that implements bidirectional energy flow between electric vehicle and single phase grid. The proposed topology and control ensures that all major grid requirements such as unity power factor, power quality and total harmonic distortion at grid side are achieved. It also features constant charging current for battery, constant DC link voltage, fast transition in power flow from one direction to another and independent control for power supplied to grid, battery charging current and DC link voltage. The control loop and configuration are such that the system can provide boosting at multiple points and thereby the DC link voltage remains constant irrespective of the power flow direction and turns ratio of the high frequency transformer. Simulated results validate the feasibility of the system and effectiveness of its control. The nonlinearities of the system is taken into account in the simulations. © 2020 IEEE.
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    A Novel AC Current Sensorless Hysteresis Control for Grid-Tie Inverters
    (Institute of Electrical and Electronics Engineers Inc., 2020) Damodaran, R.; Mudlapur, A.; Ramana, V.V.; Balasubramanian, B.; Mishra, S.
    Amongst the modulation techniques used for grid-Tie inverters (GTIs), hysteresis current control (HCC) facilitates simple, stable and rugged control with improved dynamic response. However the variable switching frequency of HCC demands high precision AC current sensors (CS) which introduce noise in the power circuit in addition to measurement noise and delay. Therefore, this brief presents a hysteresis current control without AC current sensor based on switching instant computation for a two-level GTI. The proposed control strategy uses the DC link and instantaneous grid voltages to calculate the switching instants. The conventional methods of calculating switching instant of HCC can result in tracking errors. Hence the computations are modified in the proposed algorithm considering the effects of non-linearity in error current and dynamic variations due to supply and load changes. A single-phase GTI is simulated with the proposed control and the results are verified experimentally. The proposed method is observed to considerably reduce the computational time, DC shift and total harmonic distortion compared to the commonly used sensorless current control. © 2004-2012 IEEE.