Browsing by Author "Muhammed Ramees, M.M.K.P."

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    A Robust Open Circuit Fault Detection and Localization Scheme for HERIC PV Inverter
    (Institute of Electrical and Electronics Engineers Inc., 2025) Muhammed Ramees, M.M.K.P.; Ahmad, M.W.
    Transformerless inverters are widely used to integrate the photovoltaic (PV) source into the distributed generation system. Within the converter, an open-circuit (OC) switch fault may lead to the partial or total failure of the converter. To address this issue, a new technique for detecting and localizing OC switch faults based on pole-to-pole voltage (voltage measured across the inverter output terminals) is proposed. The proposed variables for fault detection and localization (FDL) are continuously generated with every sampled pole-to-pole voltage and are compared with threshold values which are immune to parameter variation. As a result, OC is detected and located within a switching cycle for the ac side bypass switches. For localizing the OC fault in the H-bridge, the converter is reconfigured once the fault in the H-bridge switch is detected using pole-topole voltage. The input voltage required for the maximum power point tracking (MPPT) is estimated from the voltage measured with the new sensor arrangement for pole-to-pole voltage measurement. This makes the number of sensors the same as in a conventional converter. The viability and effectiveness of this approach are demonstrated through simulation studies on the highly efficient and reliable inverter concept (HERIC) inverter, a popular transformerless inverter topology. Additionally, a laboratory prototype is developed to validate the practical applicability of the method. © 1982-2012 IEEE.
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    An Integrated Approach for Current Balancing and Open-Circuit Fault Diagnosis for Interleaved Boost Converter
    (Institute of Electrical and Electronics Engineers Inc., 2024) Muhammed Ramees, M.M.K.P.; Ahmad, W.
    Interleaved boost converters (IBCs) are widely used in many applications such as automotive and renewable energy systems due to their high efficiency, reduced input and output ripple currents, and enhanced voltage regulation. Equalizing the current handled by each phase and embedding an open-circuit switch fault detection module will improve the reliability of the converter. This article addresses these challenges by proposing one diode current sensor at the output, thereby avoiding the need for individual current sensors for each phase. The total diode current and input current of the IBC are sensed, from which the individual phase current is reconstructed. The reconstruction strategy involves selecting the proper sampling instant of the diode current and input current depending on the operating duty cycle. The proposed approach is applicable for both the continuous conduction mode and the discontinuous conduction mode of operation of the converter. Using the reconstructed phase current, both the balancing of the phase current and fault detection are performed. A perturbation-based approach is proposed for the balancing of phase current. The faulty phase can be easily detected from the reconstructed phase current. The proposed method is validated on a prototype of a three-phase IBC showing its robustness and effectiveness. © 2024 IEEE.