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124 results on '"Lakshminarasamma, N."'

6. Elemental and Averaged Real-Time Modeling for Power Electronic Systems Simulation

Author

Nitheesh, R, Dubey, Ashwini Kumar, Lakshminarasamma, N, and Karuppaswamy, B Arun

Abstract

Hardware design engineers use real-time testing platforms (RTP) to design and implement the power electronic converters (PEC). Digital signal processors (DSP) as a digital platform have an easy coding syntax for mathematically intensive control algorithms and implementation. They have fast processing and computational capabilities with the help of digital signal processors (DSP). The newly introduced DSPs have multi-cores and higher clock speeds, making them capable of real-time applications. In this context, this paper explores the possibility of using DSPs as cost-effective real-time testing platforms. The paper proposes using elemental real-time models to evaluate the system behavior and controller performance. The proposed elemental real-time model testing platform is validated for a buck converter, a series resonant dual active bridge converter (SRDAB), and a grid-connected inverter (GCI) system. This work aims to present a simple and fast low-cost testing platform, thus reducing the lead time for system development. The real-time simulation data from RTP and MATLAB simulation data are verified with experimental data. It is shown that the DSP-based real-time testing approach provides validated, low-cost solutions for real-time testing platforms.

Published
2024
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14. High-Gain Bidirectional LCLC Resonant Converter With Reconfigurable Capability.

Author

C., Nagesha and Lakshminarasamma, N.

Abstract

A reconfigurable gain circuit is proposed for an LCLC resonant converter with bidirectional capability considering wide varying redox flow battery source. A suitable hybrid control scheme for LCLC resonant converter with secondary synchronous rectifier is proposed in this work. The proposed reconfigurable circuit enables to configure secondary bridge as an active voltage doubler, full-bridge circuit during forward power transfer mode and reverse power transfer mode, respectively. The reconfigurability helps significantly to design a transformer with lower secondary turns and achieve desired high gain. The reduced transformer secondary turns result in reduced transformer parasitics. The presence of LCLC resonant tank helps to provide the additional gain; the hybrid control scheme ensures zero-voltage switching turn-on for the primary, and secondary synchronous mosfets throughout the operating range. The proposed converter is analysed using fundamental harmonic approximation. The proposed reconfigurable gain circuit and hybrid control scheme is verified experimentally for an 800 V/1 kW hardware prototype fed from 24 to 54 V input. [ABSTRACT FROM AUTHOR]

Published
2023
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19. Groundwater anomaly detection using machine learning

Author

Chandana R, Shima Ramesh Maniyath, Namitha K S, Pooja G, and Lakshminarasamma N

Subjects
Artificial neural network, business.industry, Computer science, Anomaly (natural sciences), Decision tree, Machine learning, computer.software_genre, Synthetic data, Data modeling, Support vector machine, Anomaly detection, Artificial intelligence, Gradient boosting, business, computer
Abstract

The purpose of this paper is to present research on modelling and algorithms for groundwater detection. The chosen surrogates are the most correlated features for anomaly detection. The algorithm used in this paper is one class support vector, K- Nearest Neighbors, Gradient Boosting and Decision tree. Colorado River Watch's machine and real-time data are used for putting the model and algorithms through their paces. The Python programme is briefly discussed in order to design the code. Because groundwater contamination is uncommon in practice, we also put our model to the test for anomaly identification using synthetic data from numerical simulations of flow and transport in porous media.

Published
2021

29. A family of auxiliary switch ZVS-PWM dc-dc converters with coupled inductor

Author

Lakshminarasamma, N. and Ramanarayanan, V.

Subjects
Electric current converters -- Design and construction, Inductors -- Usage, Switching circuits -- Design and construction, Electric current converter, Business, Electronics, Electronics and electrical industries
Abstract

A novel auxiliary switch dc-dc converter with coupled inductor is presented in this paper. The proposed circuit achieves loss-less switching for both the main and auxiliary switches without increasing the main device current/voltage rating. A tapping in the pole inductor is added for the purpose of commutation. The proposed circuit is capable of operation at elevated switching frequencies of several hundreds of kHz, in a range of line and load variations. The proposed circuit is applicable to all isolated and non-isolated dc-dc converters. The performance and the design equations of the ZVS are identical for all types of dc-dc converters when the throw voltage and the pole current are properly defined. In the sections that follow, operating principle and theoretical analysis of the proposed circuit is outlined through the example of buck converter. Simulation and experimental results of 33 W,400 kHz boost converter are presented. Index Terms--Auxiliary switch converters, coupled inductor, resonant converters, zero current switching (ZCS), zero voltage switching (ZVS).

Published
2007

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