Modelling Photovoltaic Systems Using PSpice - 45271 pref

Modelling Photovoltaic Systems Using PSpice - 45271 pref

Preface

Photovoltaic engineering is a multidisciplinary speciality deeply rooted in physics for solar cell theory and technology, and heavily relying on electrical and electpolrlli;c engineering for system design and analysis.

The conception, design and analysis of photovoltaic systems are important tasks oh requiring the help of computers to perform fast and accurate computations or simuhfim.

Today’s engineers and professionals working in the field and also students of dSa& technical disciplines know how to use computers and are familiar with r~nning .rpeckaliz& software. Computer-aided technical work is of great help in photovoltaics became a#

the system components are described by nonlinear equations, and the node circuit quaions that have to be solved to find the values of the currents and voltages, most often do I& have analytical solutions. Moreover, the characteristics of solar cells and PV generators sarongly depend on the intensity of the solar radiation and on the ambient temperature. As k are variable magnitudes with time, the system design stage will be more accurate if a4.1 estimation of the performance of the system in a long-term scenario with realistic tikm series of radiation and temperature is carried out.

The main goal of this book is to help understand PV systems operation gathering concepts, design criteria and conclusions, which are either defined or illustrated us& computer software, namely PSpice.

The material contained in the book has been taught for more than 10 years as an undergraduate semester course in the UPC (Universidad Politecnica de catahria) in Barcelona, Spain and the contents refined by numerous interactions with the studats.

PSpice was introduced as a tool in the course back in 1992 to model a basic solar celI and since then more elaborated models, not only for solar cells but also for PV gemerators, battery, converters, inverters, have been developed with the help of MSc and PhD -dents. The impression we have as instructors is that the students rapidly jump into the tool and am ready to use and apply the models and procedures described in the book by themselves- Interaction with the students is helped by the universal availability of Pspice or mze advanced versions, which allow the assignments to be tailored to the development: of the course and at the same time providing continuous feedback from the students on the xvi PREFACE difficulties they find. We think that a key characteristic of the teaching experience is that quantitative results are readily available and data values of PV modules and batteries from web pages may be fed into problems and exercises thereby translating a sensation of proximity to the real world.

PSpice is the most popular standard for analog and mixed-signal simulation. Engineers rely on PSpice for accurate and robust analysis of their designs. Universities and semi- conductor manufacturers work with PSpice and also provide PSpice models for new devices. PSpice is a powerful and robust simulation tool and also works with Orcad CaptureB, Concept@ HDL, or PSpice schematics in an integrated environment where engineers create designs, set up and run simulations, and analyse their simulation results. More details and information about PSpice can be found at http://www.pspice.com/

At the same web site a free PSpice, PSpice 9.1 student version, can be downloaded. A request for a free Orcad Lite Edition CD is also available for PSpice evaluation from http:// w.pspice.com/download/default.asp.

PSpice manuals and other technical documents can also be obtained at the above web site in PDF format. Although a small introduction about the use of PSpice is included in Chapter 1 of this book, we strongly encourage readers to consult these manuals for more detailed information. An excellent list of books dedicated to PSpice users can also be found at http:// w.pspice.com/publications/books.asp.

All the models presented in this book, developed for PSpice simulation of solar cells and

PV systems behaviour, have been specially made to run with version 9 of PSpice. PSpice offers a very good schematics environment, Orcad Capture for circuit designs that allow PSpice simulation, despite this fact, all PSpice models in this book are presented as text files, which can be used as input files. We think that this selection offers a more comprehensive approach to the models, helps to understand how these models are implemented and allows a quick adaptation of these models to different PV system architectures and design environ- ments by making the necessary file modifications. A second reason for the selection of text files is that they are transportable to other existing PSpice versions with little effort.

All models presented here for solar cells and the rest of the components of a PV system can be found at w.esf.upc.es/esf/, where users can download all the files for simulation of the examples and results presented in this book. A set of files corresponding to stimulus, libraries etc. necessary to reproduce some of the simulations shown in this book can also be found and downloaded at the above web site. The login, esf and password, esf, are required to access this web site.

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