Dr. Rashmi M. R. currently serves as Associate Professor at Department of Electrical & Electronics, Amrita School of Engineering, Banglore campus.


Publication Type: Journal Article
Year of Publication Publication Type Title
2016 Journal Article V. Madusuthanan and Rashmi, M. R., “Bi-directional soft switched quasi z-source DC-DC converter with buck and boost capabilities”, Journal of Chemical and Pharmaceutical Sciences, vol. 9, pp. 471-475, 2016.[Abstract]

The Voltage Source Converter and the Current Source Converters have the limitations that either they buck or boost the voltage but cannot buck-boost. Quasi Z-source DC-DC converter has an impedance network which performs buck-boost operations. In Quasi Z-Source DC-DC converter the input current is continuous and also the voltage stress across the switches is less. The Quasi Z-Source can boost the input voltage using reduced passive component with improved reliability and reduce cost. Compared to the existing DC-DC converter circuits, they reduce in-rush and harmonic current. Therefore this paper aims at a soft switched Quasi Z-source Converter (qZSC). The simulation results for the proposed configuration are also presented in this paper. More »»
2016 Journal Article V. P. Kumar, Suresh, A., and Rashmi, M. R., “Optimal design of fused chopper based standalone hybrid wind solar system”, Indian Journal of Science and Technology, vol. 9, 2016.[Abstract]

Objective: The target of this paper is to implement an economical chopper and electrical converter for the hybrid windsolar system. Method: A replacement topology of a mix of CUK and SEPIC convertor is used rather than a private DC/DC convertor. The motor load is provided by victimization the two diodes that connects each wind and solar energy singly or along depending on accessibility. With the improved management in DC/DC convertor and within the electrical converter that associated with the auxiliary circuit in accumulation by the closed-loop system PI controller a more robust control is achieved. Findings: The fused chopper replaced the separate solar and wind choppers and rather than typical electrical converter the novel pulse width modulated electrical converter used supplied with a correct pulse width modulation (PWM) control using 3 equal reference signals. The closed-loop system management is achieved with the digital PI controller and MPPT draws the maximum power from the solar that improves the response with the fast raise in load. The system is validated with MATLAB/Simulink and therefore the output voltage of fused chopper for various solar irradiance and wind speed are tabulated. The output voltage of electrical converter and therefore the motor characteristics are analyzed. Applications/Improvements: For standalone applications within the agriculture water pumping the requirement will satisfy with the hybrid wind solar system. More »»
2015 Journal Article G. Udhayakumar, Rashmi, M. R., Patel, K., Ramesh, G. P., and Suresh, A., “Supply power factor improvement in ozone generator system using active power factor correction converter”, International Journal of Power Electronics and Drive Systems, vol. 6, pp. 326-336, 2015.[Abstract]

Artificial Ozone Generating system needs High Voltage, High Frequency supply. The Ozonator distorts the supply currents and henceforth affect the supply power factor. This paper presents the performance comparison of PWM inverter to Power Factor Corrected (PFC) converter with PWM inverter based High-voltage High-frequency power supply for ozone generator system. The conventional inverter has front end bridge rectifier with smoothing capacitor. It draws non-sinusoidal current from ac mains; as a result input supply has more harmonics and poor power factor. Hence, there is a continuous need for power factor improvement and reduction of line current harmonics. The proposed system has active power factor correction converter which is used to achieve sinusoidal current and improve the supply power factor. The active PFC converter with PWM inverter fed ozone generator generates more ozone output compared to the conventional inverter. Thus the proposed system has less current harmonics and better input power factor compared to the conventional system. The performance of the both inverters are compared and analyzed with the help of simulation results presented in this paper. © 2015 Institute of Advanced Engineering and Science. All rights reserved.

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2013 Journal Article M. R. Rashmi and Anu, B., “Cascading of diode clamped multilevel inverter boosters for high voltage applications”, Applied Mechanics and Materials, vol. 313-314, pp. 876-881, 2013.[Abstract]

Nonconventional energy sources are playing important role in meeting current power/energy demands. However these sources cannot provide High voltage/power. For power conditioning and voltage amplification solid state power converters are very much essential. One such approach to obtain high voltage was to use cascaded multilevel inverter but cascaded multilevel inverters require separate DC sources and they cannot be used for regenerative applications. To overcome these limitations, a novel configuration is using diode clamped multilevel inverter is proposed here. The conditioned DC voltage from photovoltaic cells or fuel cells or batteries is boosted and inverted by means of multistage Multilevel Inverters (MLI). Three different configurations are presented in this paper. From the simulation results of all three configurations, the topology which is found to be better is implemented in the real time. A proto type is developed to boost 40 V input DC to 100 V AC and the experimental results for the same are presented. © (2013) Trans Tech Publications, Switzerland.

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Publication Type: Conference Paper
Year of Publication Publication Type Title
2015 Conference Paper P. M. Sibi Raj and Rashmi, M. R., “Reduction of common mode voltage in three phase inverter”, in Proceedings of IEEE International Conference on Technological Advancements in Power and Energy, TAP Energy 2015, 2015, pp. 244-248.[Abstract]

Pulse Width Modulated (PWM) inverters produce common mode voltage. The common mode voltage will have adverse effect on the motor bearings. Hence the common mode voltage has to be reduced. This paper presents a modified Sinusoidal Pulse Width Modulation (SPWM) scheme in which two complementary modulating inputs are used to generate the pulses for the switches of a two level, three phase inverter to reduce the common mode voltage. The performance of proposed modulation scheme is evaluated and tested for various switching frequencies. With the proposed modulation scheme the phase voltages appears to be three level voltage which helps in reduction of common mode voltage. A comparative study of common mode voltage with both normal and modified SPWM method is also done and the results are presented in this paper. © 2015 IEEE.

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2014 Conference Paper K. Ishwarya and Rashmi, M. R., “Space Vector based PWM strategies for VSI fed induction motor drives with reduced complexity”, in 2014 Power and Energy Systems Conference: Towards Sustainable Energy, PESTSE 2014, Bangalore, 2014.[Abstract]

This paper presents a simple space vector approach for the generation of different switching sequences such as Space Vector Pulse Width Modulation (SVPWM), Basic Bus Clamping PWM (BBCPWM) and Advanced Bus Clamping PWM (ABCPWM) algorithms with reduced complexity. It brings out alikeness between the carrier comparison and space vector approaches. The conventional space vector approach requires calculation of sector and angle information which is a complex procedure. For simplicity the proposed space vector approach generates pulses using instantaneous phase voltages only. To validate the proposed algorithm simulation studies have been carried on v/f controlled induction motor drive at various modulation indices and the results are presented. The results show the good agreement with the proposed work. © 2014 IEEE.

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