Survey on Photo-Voltaic Powered Interleaved Converter System

Renewable energy is the best solution to meet the growing demand for energy in the country. The solar energy is considered as the most promising energy by the researchers due to its abundant availability, eco-friendly nature, long lasting nature, wide range of application and above all it is a maintenance free system. The energy absorbed by the earth can satisfy 15000 times of today’s total energy demand and its hundred times more than that our conventional energy like coal and other fossil fuels. Though, there are overwhelming advantages in solar energy, It has few drawbacks as well such as its low conversion ratio, inconsistent supply of energy due to variation in the sun light, less efficiency due to ripples in the converter, time dependent and, above all, high capitation cost. These aforementioned flaws have been addressed by the researchers in order to extract maximum energy and attain hundred percentage benefits of this heavenly resource. So, this chapter presents a comprehensive investigation based on photo voltaic (PV) system requirements with the following constraints such as system efficiency, system gain, dynamic response, switching losses are investigated. The overview exhibits and identifies the requirements of a best PV power generation system

A unified approach to the design of PWM-based sliding-mode voltage controllers for basic DC-DC converters in continuous conduction mode

Author name used in this publication: Chi K. Tse2006-2007 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

General design issues of sliding-mode controllers in DC-DC converters

Author name used in this publication: Chi K. Tse2007-2008 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Advances in Control of Power Electronic Converters

This book proposes a list of contributions in the field of control of power electronics converters for different topologies: DC-DC, DC-AC and AC-DC. It particularly focuses on the use of different advanced control techniques with the aim of improving the performances, flexibility and efficiency in the context of several operation conditions. Sliding mode control, fuzzy logic based control, dead time compensation and optimal linear control are among the techniques developed in the special issue. Simulation and experimental results are provided by the authors to validate the proposed control strategies

Modulation and Control Techniques for Performance Improvement of Micro Grid Tie Inverters

The concept of microgrids is a new building block of smart grid that acts as a single controllable entity which allows reliable interconnection of distributed energy resources and loads and provides alternative way of their integration into power system. Due to its specifics, microgrids require different control strategies and dynamics of regulation as compared to ones used in conventional utility grids. All types of power converters used in microgrid share commonalities which potentially affect high frequency modes of microgrid in same manner. There are numerous unique design requirements imposed on microgrid tie inverters, which are dictated by the nature of the microgrid system and bring major challenges that are reviewed and further analyzed in this work. This work introduces, performs a detailed study on, and implements nonconventional control and modulation techniques leading to performance improvement of microgrid tie inverters in respect to aforementioned challenges

Sliding mode control of DC/DC switching converters for photovoltaic applications

2011 - 2012The maximum power point tracking (MPPT) is one of the most important features of a system that process the energy produced by a photovoltaic generator must hold. It is necessary, in fact, to design a controller that is able to set the value of voltage or current of the generator and always ensure the working within its maximum power point. This point can considerably change its position during the day, essentially due to exogenous variations, then sunshine and temperature. The MPPT techniques presented in literature and adopted in commercially devices operate a voltage control of the photovoltaic generator and require careful design of the control parameters. It is in fact complex obtain high performance both in stationary that strongly variable conditions of sunshine without a careful choice of some parameters that affect in both conditions the performance of the algorithm for the MPPT. In this thesis has been addressed the analysis of an innovative current-based MPPT technique: the sensing of the current in the capacitor placed in parallel with the photovoltaic source is one of the innovative aspects of the proposal. The controller is based on a nonlinear control technique called ”sliding mode” of which has been developed an innovative model that allow to obtain a set of conditions and enable the designing of the controller with extreme simplicity. The model also allow to demonstrate how the performance of this MPPT control tecnique are independent not only from the characteristics and operating conditions of the photovoltaic generator, but also by the parameters of the switching converter that implements the control. This property allows a significantly simplification in the designing of the controller and improve the performance in presence of rapid changes of the irradiance. An approach to the dynamic analysis of a class of DC/DC converters controlled by a sliding mode based maximum power point tracking for photovoltaic applications has been also presented. By referring to the boost and SEPIC topologies, which are among the most interesting ones in photovoltaic applications, a simple analytical model is obtained. It accounts for the sliding mode technique that allows to perform the maximum power point tracking of the photovoltaic generator connected at the converters input terminals. Referring to the previous approach, a correction term allowing to have an increased accuracy of the model at high frequencies has been also derived. The control technique proposed has been implemented by means of low cost digital controller in order to exploit the potential offered by the hardware device and optimize the performance of the controller. An extensive experimental analysis has allowed to validate the results of the research. The laboratory measurements were conducted on prototypes of DC/DC converters, boost and SEPIC, carried out by Bitron SpA. There are a considerable experimental tests both in the time and in the frequency domain , both using source generator in laboratory than photovoltaic panels. The results and theoretical simulations have found a large validation through laboratory measurements. [edited by author]XI n.s

Control Theory in Engineering

The subject matter of this book ranges from new control design methods to control theory applications in electrical and mechanical engineering and computers. The book covers certain aspects of control theory, including new methodologies, techniques, and applications. It promotes control theory in practical applications of these engineering domains and shows the way to disseminate researchers’ contributions in the field. This project presents applications that improve the properties and performance of control systems in analysis and design using a higher technical level of scientific attainment. The authors have included worked examples and case studies resulting from their research in the field. Readers will benefit from new solutions and answers to questions related to the emerging realm of control theory in engineering applications and its implementation