Conference Papers
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Item Simulation of SVPWM based FOC of CSI fed induction motor drive(2012) Ronanki, D.; Rajesh, K.; Parthiban, P.The application of current source inverters (CSI)in induction motor (IM) drives offers a number of advantages, including voltage boosting capability, natural shoot-through short-circuit protection and generation of sinusoidal voltages. In this paper, an attempt to model the CSI fed IM drive is presented. The mathematical model takes into account of the inverter, and induction motor dynamics and is established in the stationary reference frame. For controlling the drive speed, a direct field-oriented control (FOC) is proposed. To counter the effects of torque pulsations at very low speeds and the rotor resistance variation, a slip angle compensation loop is included in the control law formulation. Analytical expressions for CSI fed IM with Direct FOC are derived and validated using MATLAB/SIMULINK. © 2012 IEEE.Item PV-battery powered direct torque controlled switched reluctance motor drive(2012) Ronanki, D.; Parthiban, P.Categorized as one of the renewable energies, Photo-Voltaic system has a great potential compared to its counterparts of renewable energies. This paper deals with the design of a Photovoltaic (PV)-Battery fed Switched Reluctance Motor(SRM). The system mainly composed of a PV module, boost converter, rechargeable battery, bidirectional converter, asymmetric bridge converter, SRM and system controllers. The main problems of SRM are high torque ripple, acoustic noise and vibration problems. In order to reduce these problems, a new direct torque control of 3.5 kW 8/6 SRM is proposed, which is simple and can be implemented with low cost processor. It can be seen from the simulation results that this scheme has well regulated the torque output of the motor with in hysteresis band. The proposed system assures its suitability for solar applications like solar vehicles, solar water pumping system and floor mills in hilly and isolated areas. © 2012 IEEE.Item A small 4-wheeler EV propulsion system using DTC controlled induction motor(2013) Ronanki, D.; Hemasundar, A.; Parthiban, P.With the increasing need of electric vehicles (EV), necessary development is required to get reliable, efficient and economical drives for electric propulsion. Electric propulsion system using Induction Motor drive (IM) is becoming so popular because of its reliability, technological maturity and low cost. Field Orientation Control (FOC) is so popular in controlling the IM, but it has disadvantages like sensitive to parametric variation, external disturbance, load variation and also algorithm takes more time for execution, hence it requires a very fast microprocessor with high millions of instructions per second (MIPS) for implementation. In this paper, IM is controlled by using Direct Torque Control (DTC) technique because of its simple configuration and gives quick response. The mathematical model takes into account of the inverter, IM dynamics and vehicle aerodynamics. In this paper, the response of the IM with DTC for EV load for driving cycle consists of starting, acceleration, constant speed and deceleration modes are explained and validated using MATLAB/SIMULINK.Item Performance study of high frequency link AC-AC converter(IEEE Computer Society, 2014) Ansal, V.; Parthiban, P.; Ravikumar, K.In this paper operation performance of an high-frequency (HF) link ac/ac converter is demonstrated using computer aided simulation package PSCAD/EMTDC. The converter consists of input filter, input matrix converter, HF transformer, and output matrix converter. The proposed configuration permits flexibility in the choice of voltage levels and frequency in the system without the penalty of bulky magnetic components. The proposed approach achieve high voltage transfer ratio, HF galvanic isolation of the input source from the output utility, higher power density by introducing a HF transformer in between the two stages of the converter. It is capable of having bidirectional power flow, achieve lower harmonic distortion on both input and output sides with proper filter design and controllable input displacement power factor. It also provides fast response, high efficiency, and free from acoustic noise. Comprehensive results are presented to assess the performance of the converter. Several features like voltage sag compensation, instantaneous voltage regulation, and power factor correction can be combined to this converter. This kind of converter laid the base for regulated ac power supplies and electronic transformers. © 2014 IEEE.Item Analysis of current controlled voltage source Inverter with Space Vector PWM and Sinusoidal PWM techniques(Institute of Electrical and Electronics Engineers Inc., 2015) Show, S.K.; Parthiban, P.Space Vector Modulation (SVM) and Sinusoidal Pulse Width Modulation (SPWM) are the most prominent methods used for providing gating signals on switches of a 3-phase and 1-phase Inverters. This paper presents a comparison of SVM and SPWM techniques used on a 3-phase Inverter based on the Total Harmonic Distortion (THD) of Inverter Output Voltage and Current waveforms. It has focused on the two above mentioned PWM methods which are being used to develop current controlled based model applied on three phase loads. Simulation study of 3 phase Inverter has been carried out using SPWM and SVM techniques and THD of output voltage and current waveforms of the Inverter has been compared. The results shows an improvement in output power quality of the 3-phase inverter with current controlled SVM than the current controlled SPWM. © 2015 IEEE.Item Simulation study of a power electronic transformer based on matrix converter(IEEE Computer Society help@computer.org, 2015) Ansal, A.; Parthiban, P.A power electronic transformer (PET) is a direct AC/AC converter with a high frequency isolation. Various topologies of electronic PETs have been discussed in recent literatures. This paper is concentrated on the simulation study of an electronic transformer adopting matrix converter on either side of the high frequency isolation transformer. The industrial standard power system simulation package PSACD/EMTDC is used for the modeling of the PET. The PET described can convert a sinusoidal AC to a lower or higher voltage and/or to a lower or higher frequency without DC link. Both the steady state and transient performance of the converter are carried out to assess the performance. The simulation results of the converter shows that the PET accomplishes high frequency isolation, bidirectional power flow, two stage power conversion, higher power density, controllable input source displacement power factor, and lower harmonic distortion on both input and output sides. © 2014 IEEE.Item Transformerless Dynamic Voltage Restorer for voltage sag mitigation(Institute of Electrical and Electronics Engineers Inc., 2016) Ansal, V.; Ravikumar, K.; Parthiban, P.Dynamic Voltage Restorers are identified to be cost effective solution for protecting sensitive loads from voltage related power quality issues. The extension of cost reduction and efficiency can be improved by eliminating the injection transformer. This paper discusses a transformer-less dynamic voltage restorer based on three-single phase Voltage Source Inverters(VSI). Since the DVR does not have an injection transformer, it has lower loss, lower cost and it is less bulky. The DVR control is implemented using Synchronous Reference Frame(SRF)theory. Estimation of the reference load voltage is carried out using unit vectors. The simulation results carried out in MATLAB shows the effectiveness of the DVR in compensating the voltage sag. © 2016 IEEE.Item Design and implementation of sliding mode voltage controller for DC to DC buck converter by using hysteresis modulation and pulse width modulation(Institute of Electrical and Electronics Engineers Inc., 2016) Kiran, B.; Parthiban, P.; Jena, D.; Prakash, P.S.This paper presents the design and implementation of sliding mode control law to the output voltage control of DC to DC buck converter. The robustness of the sliding mode controller is tested by changing the different circuit components and comparing the results with conventional linear controller. The result shows that the sliding mode controller performs better in the transient condition over a wide range of operation when compared with linear controller. Sliding mode controllers by using hysteresis modulation and pulse width modulation are implemented in MATLAB/simulink. The disadvantages of sliding mode controller by using hysteresis modulation is overcome by using pulse width modulation. © 2016 IEEE.Item A SVPWM for reduction in common mode and bearing currents applied to diode clamped three-level inverter fed induction motor(Institute of Electrical and Electronics Engineers Inc., 2016) Ronanki, D.; Parthiban, P.PWM inverters used in motor drives produce high frequency Common Mode Voltages (CMV) which results in Common Mode (CM) currents and bearing currents due to parasitic capacitances. These currents cause abominable effects in electronics devices and develop voltage at motor shaft. When voltage exceeds dielectric breakdown voltage of lubricant film, it develops a huge bearing current which can damage bearings in very short interval. This paper emphasis on mitigation of CM currents and bearing currents by minimizing CMV produced by inverter-motor system based on selection and refinement of PWM algorithm without any additional hardware change. Multilevel inverters are apt for industrial applications due to low voltage distortion and less stress on switching devices than conventional two level inverter. To Investigate the effects on CMV, CM currents, bearing currents and motor shaft voltage, a high frequency Induction Motor (IM) model was chosen and analysis was done with different PWM techniques. The present work focused on three level Diode Clamped MultiLevel Inverter (DCMLI) and proposed new Space vector Pulse width Modulation (SVPWM) by choosing reductant CMV vectors in combination with sequence of changing one state in phase during switching transition. The proposed SVPWM technique shows the effectiness to reduce CMV as well as Electro-Magnetic Interference (EMI) and validated using MATLAB simulations. © 2016 IEEE.Item High gain bidirectional DC-DC converter with reduced component count(Institute of Electrical and Electronics Engineers Inc., 2017) Darbha, L.; Parthiban, P.Solar Photovoltaic system as a source and battery as an intermediary load necessitates the development of bidirectional dc-dc converter. Conventional battery loads are rated at 12 V to 48 V. High gain is required both in step up and step down modes to supply the ac grid or charge from the grid. Conventional isolated transformer based topologies can be designed with high gain at the expense of increase in component count and requirement of snubber circuits for protection as the leakage inductance causes a spike across the switch resulting in losses, complex control schemes and the requirement of over rated components. Non isolated converter circuits with coupled inductors are used for low power systems. The size of the converter, magnetic losses increase with increase in the inductance for higher power capability. The proposed converter is a non isolated converter requiring minimum number of switches. Various operating modes and the analysis of the converter are discussed. Simulation results of the system with MATLAB and PSIM are presented. © 2017 IEEE.