Faculty Publications
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Item Single-Phase Six-Switch Four-Port Boost Inverter With Active Power Decoupling(Institute of Electrical and Electronics Engineers Inc., 2024) Ramanarayana Reddy, M.; Dastagiri Reddy, B.; Prabhakaran, P.; Kishan, D.This letter proposes a novel single-phase six-switch four-port boost inverter with active power decoupling (6S4PwA). The four ports are two dc ports, an ac port, and a ripple port that acts as an active power decoupling (APD) circuit. A novel hybrid modified sinusoidal pulsewidth modulation (HMSPWM) scheme is proposed to operate the 6S4PwA. The proposed topology along with the HMSPWM scheme achieves high voltage gains at both the dc and ac ports and also eliminates the double-frequency ripple at dc ports. The ac film capacitor employed at the ripple port absorbs the 2ω ripple component, thereby eliminating dc-link voltage and inductor current ripples at two dc ports. Hence, the size of the dc-link capacitor and inductor at dc ports is reduced significantly. Overall, the proposed topology employs fewer components for four ports and reduces the size of passive elements, resulting in improved power density and reduced cost. To evaluate the performance of the proposed topology, a 500-W prototype is fabricated and tested. The experimental results show that the converter attains boost, inverter, and APD operations in a single stage and also improves power quality at the ac port. © 1986-2012 IEEE.Item A Transformerless Bidirectional Active Switched Inductor-Based SEPIC High-Gain DC–DC Converter With Buck–Boost Capability(Institute of Electrical and Electronics Engineers Inc., 2025) Mandal, S.; Prabhakaran, P.; Dominic, D.A.; Parameswaran, A.P.The growing demand for efficient and compact power conversion systems in electric vehicles (EVs), renewable energy systems, DC microgrids, and both portable and stationary medical equipment has intensified research into non-isolated high-gain bidirectional DC-DC converters. Existing solutions often employ transformer-based topologies or coupled inductors, which introduce increased cost, size, and control complexity. This paper presents a novel transformerless bidirectional high-gain DC-DC converter based on a modified Single-Ended Primary Inductor Converter (SEPIC) architecture. The proposed topology incorporates an Active Switched Inductor (ASL) at the input stage to achieve a wide voltage conversion ratio while ensuring reduced voltage stress on the maximum power switches. A key feature of the converter is its ability to provide bidirectional buck–boost operation in both power flow directions, while maintaining a reduced component count and improved efficiency through synchronous rectification. The converter’s performance is thoroughly analyzed under both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Furthermore, detailed small-signal modeling and closed-loop controller design are developed for both voltage-mode and current-mode control. A 200 W experimental prototype employing SiC MOSFETs is implemented to validate the theoretical analysis. Experimental results confirm the high efficiency, robust dynamic response, and practical feasibility of the proposed converter for next-generation power conversion applications. © 2013 IEEE.Item A sorted modified multi-reference PWM technique for solar PV panel companion grid-tied inverters(Springer Science and Business Media Deutschland GmbH, 2025) Maheswari, G.; Manjunatha Sharma, K.M.; Prabhakaran, P.Pulse Width Modulation (PWM) techniques are increasingly vital in solar energy-driven grid-tied companion inverters, significantly enhancing power quality. This paper proposes the Sorted Modified Multireference Pulse Width Modulation (SMMR PWM) technique. The SMMR PWM with a Maximum PowerPoint Tracking (MPPT) control strategy is implemented in a Solar PV Panel Companion Grid-Tied Inverter (SPPCGTI) system featuring single-stage power conversion. In the SPPCGTI system, each inverter's output voltage adopts a quasi-square waveform, where the pulse width correlates with the power generated by the associated solar PV panel. By employing the SMMR PWM technique with the MPPT control strategy in the SPPCGTI system, precise MPPT for each PV panel is achieved, irrespective of uniform or non-uniform irradiation conditions. Additionally, this technique reduces Total Harmonic Distortion (THD) in the AC grid current of the solar PV panel companion inverter (SPPCI) while simultaneously enhancing MPPT efficiency, inverter efficiency [inverter efficiency is less than the Sorted-Staircase Modulation (SSCM) and more than the Sorted PWM (SoPWM)], and reducing settling time compared to the existing techniques like SSCM and SoPWM. The SPPCGTI with the integrated SMMR PWM technique, MPPT algorithm, and current controller is modeled and simulated in MATLAB/Simulink. Experimental testing affirms the outstanding performance of the proposed SMMR PWM technique. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.Item Implementation of a novel nine-level double boosting multi-level inverter(Springer Science and Business Media Deutschland GmbH, 2025) Maheswari, G.; Manjunatha Sharma, K.M.; Prabhakaran, P.Switched capacitor multi-level inverter topologies have garnered the attention of industrial power electronics researchers due to their potential in different industrial and renewable energy source applications. This paper proposes a novel nine-level, twofold voltage gain boost (9L2x) inverter designed for photovoltaic (PV) applications, addressing common challenges in transformer-less multi-level grid-tied PV inverters, such as leakage current and output voltage bucking. This design utilizes switched capacitors (SC) with a common ground, achieving a twofold voltage boost without needing an extra boost converter. The proposed topology reduces the active switch count, enhances power density, and lowers costs while ensuring self-balancing SCs and minimizing total standing voltage. The common grounding mitigates leakage current, making the system more efficient. The proposed topology features a diode-inductor circuit at the input DC side to reduce inrush current, decrease capacitor voltage ripples, reduce the total harmonic distortion of the MLI output voltage, and improve efficiency. A proportional-integral controller manages active grid power, and a modulation strategy ensures SC voltage balance. The paper delves into intricate details concerning the inverter’s circuitry, control methodologies, and pulse-width modulation scheme. This nine-level inverter design is thoroughly validated through extensive simulations and practical hardware-in-the-loop experiments. The results consistently affirm the effectiveness and feasibility of this novel inverter, positioning it as a significant advancement over existing nine-level inverters. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.