Browsing by Author "Lakshmanan, P."

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    An Observer Based Control Method for Single-Phase Low-Voltage Inverters
    (Institute of Electrical and Electronics Engineers Inc., 2020) Lakshmanan, P.
    This paper presents an observer based control method for single-phase low voltage inverters in stand-alone mode. The performance of the proposed control scheme is evaluated with two different types of observers. Enhancements to the observer based control strategy are presented and compared with respect to the Total Harmonic Distortion (THD) in the inverter output voltage when feeding non-linear loads. Simulation results are presented to validate the proposed control methods. © 2020 IEEE.
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    Decoupled Alpha-Beta control for distortion reduction in three-phase low-voltage Inverters
    (Institute of Electrical and Electronics Engineers Inc., 2020) Lakshmanan, P.
    This paper presents an observer based control method for unbalance and harmonic compensation in three-phase three wire low voltage inverters in stand-alone mode. In the proposed control approach, unbalance compensation can be performed by controlling three-phase inverter as a pair of single-phase inverters, namely the alpha and beta channel inverters. An adaptive feed forward compensation can be incorporated in both the alpha and beta channels of the inverter to reduce the load induced harmonic distortions in the inverter output voltage. This approach is based on multi-loop control comprising voltage and current control loops applied to alpha and beta channels of the three-phase inverter. The efficacy of the proposed Decoupled Alpha-Beta (DAB) method in overcoming distortion as well as unbalance in the output voltage waveform is illustrated with simulation results. © 2020 IEEE
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    Modified Selective Harmonics Mitigation PWM for a Switched Diode Multilevel Inverter
    (IOP Publishing Ltd, 2021) Sahaya Ponrekha, A.; Jagabar Sathik, J.; Lakshmanan, P.; Singh, J.; Mani, L.; Mandal, A.; Madhavan, J.
    A modified selective harmonic mitigation (SHM) technique for multilevel inverters considering the RMS output voltage magnitude is presented. The harmonic contents in the output voltage of these inverters must satisfy the specified grid code requirement standards. In conventional SHM techniques, the firing angles of the multilevel inverters have been derived by taking into account grid code harmonic reduction standards. When the multi-level inverters are driven with these firing pulses generated, it results in reduction of the magnitude of the inverter output voltage. In order to overcome this issue of output voltage reduction, the modified SHM optimization problem includes another constraint on the RMS output voltage limits, which results in different set of firing angles. This facilitates the use of firing angles, which takes into account the grid code standards of harmonic mitigation without compromising the value of the RMS output voltage of the inverters. The proposal has been simulated and validated in MATLAB Simulink and the experimental results are obtained for a single-phase seven level inverter with Silicon made semiconductor switches. By using the proposed method, output voltage THD (upto 40th harmonics were considered) of 5.9% was obtained, which is well below the harmonic standards specified by EN 50160. © 2021 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.
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    Predictor Based Stability Control of Four-Wheel Independent Drive Electric Vehicle with Bounded Input Delay
    (Institute of Electrical and Electronics Engineers Inc., 2022) Chiliveri, V.R.; Kalpana, R.; Lakshmanan, P.
    The stability of a four-wheel independent drive electric vehicle (4WID-EV) is a significant concern to prevent accidents and maintain driver safety. In this paper, the proposed controller design guarantees the stability of 4WID-EV and tracks the desired reference trajectory despite bounded input delay. Using the finite spectrum assignment (FSA) technique, the predictor is designed to tackle input time delay and a hierarchical control structure. Hierarchical control structure assures that the vehicle tracks the desired reference path and optimally allocates the required longitudinal force to each wheel to generate yaw moment. The closed-loop stability of 4WID-EV has been proved theoretically by choosing the appropriate Lyapunov function. To validate the effectiveness of the proposed method, numerical simulation has been performed in Matlab/Simulink and the results demonstrate the better tracking performance. © 2022 IEEE