Arvind Mittal

Carrier Based Common Mode Voltage Reduction Techniques in Neutral Point Clamped Inverter Based AC-DC-AC Drive System

Common mode voltage (CMV) generation is a major problem in switching power converter fed induction motor drive systems. CMV is the zero sequence voltage generated due to the switching action of power converters. Even a small magnitude of CMV with a high rate of change may circulate large bearing currents which may damage a machine’s bearings and shorten its life. There are several methods of controlling CMV. This paper presents 3-level sinusoidal pulse width modulation based techniques to control the magnitude and rate of change of CMV in multilevel AC-DC-AC drive systems. Simulation and experimental investigations have been presented to validate the performance of proposed technique to control CMV in 3-level neutral point clamped inverter based AC-DC-AC system.

Unity power factor controller for neutral point clamped active front end converter with DC voltage balancing

The use of power electronics converters influencing the generation of harmonics and reactive power flow in a power system. Therefore, three-phase improved power quality AC-DC converters are gaining lot of popularity in power conversion applications. This paper deals with the control of three-phase neutral point clamped (NPC) 3-level AC-DC converter under balanced and unbalanced load condition. A unity power factor controller (UPC) is designed and developed for unity power factor operation of the converter under steady state and transient conditions. Further, the UPC is validated through experimentation performed on prototype developed in the laboratory.

Overview of Multi-Agent Approach for Micro-Grid Energy Management

As the power generation paradigm is going green by involvement of renewable energy sources, the energy management process also has to evolve towards new more powerful, intelligent control methods. The inter-connection of a large number of renewable energy sources to the grid, along with their obvious advantages, makes the grid highly distributed. This may cause problems of efficient control, stability, reliability, power quality and security, thus represent one of the greatest engineering challenges. To enable greater amounts of distributed and renewable energy resources across the power grid backbone for providing better demand management, the next-generation electricity grid is emerging as a system of organically integrated intelligent Micro-Grids. In order to make them intelligent the application of Information & Communication Technology (ICT), remote sensing and communication technology to power systems is gaining momentum making Micro-Grids smart. Agent-oriented software engineering paradigm represents an interesting means of analyzing, designing and building complex software systems, quite suitable to the requirements of making Micro-Grids smart. Multi-Agent System (MAS) seems to have marvelous features that meet the operation and control requirements of distributed energy resources in Micro-Grids. This paper presents an overview of the emerging sub-field of Distributed Artificial Intelligence, Multi-Agent System to control and manage the changing face of electric power grid by inculcating the intelligent agents into Micro-Grids.

Parameter logging & remote monitoring for microgrid demonstration project

As an element of research initiative to aid the prospective smart grid issues and to integrate green energy facilities lucratively a demonstration project “Design & Development of Smart Micro-Grid” is being executed in Energy Center, Maulana Azad National Institute of Technology (MANIT), Bhopal. In view of the fact that most renewable sources are intermittent in nature, their integration into the power grid infrastructure is a challenging task which is envisaged to be effectively carried through micro grids. Real time Data Acquisition from renewable energy generators and their monitoring play an extremely important role in overall supervision and the desired coordinated operation control of such diverse energy resources. The main idea of this paper is to present a continuous remote monitoring system for renewable energy sources which is one amongst the significant footsteps taken for accomplishment of the microgrid Research & Development project. It is a PC-based monitoring system able to measure remotely the real-time data of various renewable energy sources and generate reports as tables and graphs. The user may well monitor and display the data remotely by using the local area network through specific software.

Optimisation of Inner Diameter to Outer Diameter Ratio of Axial Flux Permanent Magnet Generator

This paper presents design of axial flux permanent magnet generator using torus construction of stator with plastic material. To maximise the efficiency of the generator, the losses are to be minimized in proposed N-S Arrangement iron loss is absent and only copper losses are present. To minimise the copper loss for a given rating, the per phase stator resistance is to be minimised. The relation between Internal Diameter (ID) to Outer Diameter (OD) Ratio and the per phase resistance has been developed and optimal value is worked out. Also the designs were prepared for various ID to OD ratios to verify the optimal results.

Back to Back Connected Multilevel Converters: A Review

The new power converter topologies i.e multilevel converter is major breakthrough in power conditioning applications. The role of multilevel converters for AC-AC conversion when connected Back to Back is now proving an achievement of mile stone in the field of high power conversion. In view of this a comprehensive review of Back to Back connected multilevel converters is presented in this paper, which focus mainly on its topologies, control strategies and real time industrial applications. The aim of this review is to group and review the recent publications, in order to establish the current state of the art and trends of the Back to Back connected multilevel power converters (MPCs) to provide researchers meaningful information about

An energy efficient microcontroller based digital solar weighing machine

The main aim of this study is to develop a digital weighing machine and to operate it with the help of solar PV panel, where the supply of electricity is the biggest problem. This Study describes the design and implementation of a low-cost, energy efficient portable solar powered digital electronic weighing system ideal for domestic, laboratory and commercial use. The system has highly reduced circuitry as it utilizes a standalone microcontroller chip. As this machine not uses the electricity to charge, it saves the electrical energy. The system designed measures weights ranging from 0-30 kg.