Browsing by Author "Parameswaran, A.P."

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A Bidirectional Interleaved Totem Pole PFC-Based Integrated On-Board Charger for EV SRM Drive
(Institute of Electrical and Electronics Engineers Inc., 2024) Faheem Ali, T.; Arun Dominic, A.D.; Prabhakaran, P.; Parameswaran, A.P.
This paper presents an improved integrated on-board charger (IOBC) tailored for a 4-phase switched reluctance motor (SRM) drive. The proposed IOBC is non-isolated and utilizes the totem pole power factor correction (PFC) operation for reduced common-mode voltage. Furthermore, the proposed system accommodates bidirectional functions, ensuring versatility during charging mode. A non-isolated IOBC for SRM with reduced common-mode voltage and bidirectional capability has largely been ignored in the literature. The proposed system utilizes a modified Miller converter in the motoring mode and is easily reconfigured into a two-phase interleaved totem pole converter during charging modes without the need for any magnetic contactors. The proposed system features zero instantaneous torque (ZIT) at steady-state, ensuring minimal machine wear during charging modes. The proposed IOBC is controlled to ensure symmetric positive and negative grid currents for any given rotor position (during charging), thereby eliminating even harmonics and enhancing the power quality of grid current. The proposed system achieves charging power twice the motoring power with parallel-connected phase windings. Ansys electromagnetic transient simulation, MATLAB-based SRM drive simulations, experimental results, and comprehensive comparative analysis are presented to validate the various features and effectiveness of the proposed IOBC for SRM. © 2013 IEEE.
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.
Active vibration control of a smart cantilever beam at resonance: A comparison between conventional and real time control
(2012) Parameswaran, A.P.; Gangadharan, K.V.
All mechanical systems suffer from undesirable vibrations during their operations. These vibrations are unavoidable as they depend on various factors. However, for efficient operation of the system, they have to be controlled within the specified limits. Light weight, rapid and multi-mode control of the vibrating structure is possible by the use of piezoelectric sensors and actuators coupled with feedback algorithms. In this paper, direct output feedback based active vibration control has been implemented on a smart cantilever beam at its resonant frequency using PZT (Lead Zirconate Titanate) sensors and actuators. The work aims to showcase the performance abilities of the conventional PC based control and a dedicated REAL TIME CONTROL at resonance. The platform used is LABVIEW RT with FPGA hardware and the system performance is compared with the conventional time multiplexed Operating System (Windows 7) where LABVIEW is again used with the appropriate DAQ devices. � 2012 IEEE.
Active vibration control of a smart cantilever beam at resonance: A comparison between conventional and real time control
(2012) Parameswaran, A.P.; Gangadharan, K.V.
All mechanical systems suffer from undesirable vibrations during their operations. These vibrations are unavoidable as they depend on various factors. However, for efficient operation of the system, they have to be controlled within the specified limits. Light weight, rapid and multi-mode control of the vibrating structure is possible by the use of piezoelectric sensors and actuators coupled with feedback algorithms. In this paper, direct output feedback based active vibration control has been implemented on a smart cantilever beam at its resonant frequency using PZT (Lead Zirconate Titanate) sensors and actuators. The work aims to showcase the performance abilities of the conventional PC based control and a dedicated REAL TIME CONTROL at resonance. The platform used is LABVIEW RT with FPGA hardware and the system performance is compared with the conventional time multiplexed Operating System (Windows 7) where LABVIEW is again used with the appropriate DAQ devices. Â© 2012 IEEE.
Active vibration control of a smart cantilever beam on general purpose operating system
(Defense Scientific Information and Documentation Centre, 2013) Parameswaran, A.P.; Pai, A.B.; Tripathi, P.K.; Gangadharan, K.V.
All mechanical systems suffer from undesirable vibrations during their operations. Their occurrence is uncontrollable as it depends on various factors. However, for efficient operation of the system, these vibrations have to be controlled within the specified limits. Light weight, rapid and multi-mode control of the vibrating structure is possible by the use of piezoelectric sensors and actuators and feedback control algorithms. In this paper, direct output feedback based active vibration control has been implemented on a cantilever beam using Lead Zirconate-Titanate (PZT) sensors and actuators. Three PZT patches were used, one as the sensor, one as the exciter providing the forced vibrations and the third acting as the actuator that provides an equal but opposite phase vibration/force signal to that of sensed so as to damp out the vibrations. The designed algorithm is implemented on Lab VIEW 2010 on Windows 7 Platform. © 2013, DESIDOC.
Design and development of a model free robust controller for active control of dominant flexural modes of vibrations in a smart system
(Academic Press, 2015) Parameswaran, A.P.; Ananthakrishnan, B.; Gangadharan, K.V.
Real physical vibrating smart systems exhibit a lot of nonlinearities in their dynamics. Undesirable vibrations, particularly in the regions of first as well as second resonance, play a very important role in deteriorating the stability of the system as well as its operational efficiency. The work presented in the paper focuses on an analytical technique of mathematical modeling of a vibrating piezoelectric laminate cantilever beam which is considered to be the smart system. The natural frequencies of the vibrating smart system are determined from the ANSYS simulation studies and experimentally, it is found that the vibrations induced voltage is maximum at the first followed by the second natural frequencies. Hence, the smart system is modeled analytically through finite element technique using the Euler-Bernoulli beam theory for the first two flexural modes of vibrations. To account for the possible nonlinearities, a suitable robust controller is designed based on sliding mode technique. Simulation studies on the developed analytical model indicated a high performance of the designed controller in controlling the vibrations at first and second resonance regions. Also, the designed controller was found to be effective in its operations when the excitation varied over a large range covering the first two natural frequencies. In the final stage, the designed robust controller was successfully prototyped on a Field Programmable Gate Array (FPGA) platform using LabVIEW coupled with Compact Reconfigurable Input Output (cRIO-9022) controller configured in its FPGA interface mode and the resulting robust FPGA controller successfully controlled the occurring system vibrations. © 2015 Elsevier Ltd.
Effects of Thyristor Controlled Series Capacitor (TCSC) on oscillations in tie-line power and area frequencies in an interconnected non-reheat thermal power system
(2011) Abraham, N.M.; Parameswaran, A.P.; Abraham, R.J.
This paper deals with automatic generation control of an interconnected thermal non-reheat power system in continuous mode by employing a Thyristor Controlled Series Capacitor (TCSC) in series with the line. Damping of the system frequency and tie-line power oscillations by controlling the reactance of the TCSC is presented. Gain values of the integral controllers are optimised using the integral squared error method by providing a step load disturbance in each of the areas by minimising a quadratic performance index. It is reported that TCSC can dampen the tie-line and power oscillations commendably under sudden load disturbances in any of the areas. � 2011 IEEE.
Effects of Thyristor Controlled Series Capacitor (TCSC) on oscillations in tie-line power and area frequencies in an interconnected non-reheat thermal power system
(2011) Abraham, N.M.; Parameswaran, A.P.; Abraham, R.J.
This paper deals with automatic generation control of an interconnected thermal non-reheat power system in continuous mode by employing a Thyristor Controlled Series Capacitor (TCSC) in series with the line. Damping of the system frequency and tie-line power oscillations by controlling the reactance of the TCSC is presented. Gain values of the integral controllers are optimised using the integral squared error method by providing a step load disturbance in each of the areas by minimising a quadratic performance index. It is reported that TCSC can dampen the tie-line and power oscillations commendably under sudden load disturbances in any of the areas. Â© 2011 IEEE.
Modeling and design of field programmable gate array based real time robust controller for active control of vibrating smart system
(Academic Press, 2015) Parameswaran, A.P.; Ananthakrishnan, B.; Gangadharan, K.V.
The current paper focuses on accurate mathematical modeling of a vibrating piezoelectric laminate cantilever beam theoretically as well as experimentally so as to obtain the best replication of the system dynamics on the software platform for simulation studies. The developed models were tested for accuracy in time as well as frequency domain by employing the sweep sine test. The focus of the study is on the flexural modes of vibrations of the cantilever beam. Here, modeling is focused on the first vibratory mode as it has been observed that the effects of felt vibrations would be maximum in terms of system stability and its operational efficiency when the excitation frequency matches with the first natural frequency of the system (fn1). This was validated by appropriate non-parametric modeling of the smart system by subjecting it to the Impact Hammer test. Development of accurate system models play an important role in designing and testing various control algorithms for reliable active vibration control (AVC). In the final stage, a real time active vibration robust controller was designed using a proportional derivative sliding mode control (PDSMC) technique and deployed on a Field Programmable Gate Array (FPGA) platform. The efficiency of the developed real time controller was proved in time as well as frequency domains by subjecting the closed loop system to harmonic excitations at first natural frequency as well as sweep sine test focussing on the first vibratory mode with the conclusion that the developed controller will function satisfactorily at higher modes of vibrations. © 2015 Elsevier Ltd.
Numerical and Experimental Investigations on Robust Output Feedback Control for Active Vibration Attenuation of Flexible Smart System
(Institute of Electrical and Electronics Engineers Inc., 2023) Parameswaran, A.P.; Padmasali, A.N.; Gangadharan, K.V.
This paper investigates the prototyping and implementation of an output feedback-based robust controller on a Field Programmable Gate Array (FPGA) platform. The Smart System under Test (SSuT) in this submission is a flexible cantilever beam bonded with Piezoelectric (PZT 5H) patches that act as a sensor as well as an actuator (perturbance creation as well as control actuation). For ease of modeling and subsequent controller design in the laboratory studies, the low-frequency dynamics of the smart system are approximated to only a Single Degree of Freedom (SDOF) in terms of flexural vibrations. The SSuT is modeled analytically through finite element modeling and experimentally through sub-space system identification process. The developed models' accuracy is compared with the experimental results of non - parametric modeling. The developed models are then used to conduct the simulation studies with the designed robust output feedback controller in the closed loop. Apart from the simulation studies, the designed controller was also prototyped on an FPGA platform using LabVIEW FPGA with the associated hardware in loop to carry out the experimental validation of its performance. The robustness and efficiency of the prototype controller to control the system vibrations in real-time were proved through extensive tests at single resonant frequencies and a range of frequencies encompassing the dominant resonant regions in the flexural mode. Findings from this study are further used to ensure satisfactory active vibration control of smart cantilever systems in various heavy/aerospace industries by approximating them to suitable benchmark systems in the laboratory. © 2013 IEEE.
Parametric modeling and FPGA based real time active vibration control of a piezoelectric laminate cantilever beam at resonance
(SAGE Publications Inc., 2015) Parameswaran, A.P.; Gangadharan, K.V.
The operational efficiency and life of mechanical systems/structures depends to a large extent on their vibration control. Continuously occurring vibrations on the systems can cause fatigue and the effects of these vibrations are particularly severe if they occur at a frequency matching with that of the concerned systems natural frequency - a stage called resonance. This paper focuses on achieving active vibration control of a smart cantilever beam at its first resonant frequency as it is at this stage that maximum damage to the system performance is expected. The smart system is modelled in the parametric domain using finite element modeling techniques and the obtained model is validated through experimental means. The active vibration control is achieved by employing two control algorithms namely - output feedback and error based control through general purpose operating system (LabVIEW on Windows 7) as well as in real time operating system (LabVIEW FPGA coupled with compact reconfigurable input output modules) and the performances are compared thereby justifying the importance of the deterministic and reliable real time control over the usual PC based control in experimental studies. © The Author(s) 2014.