The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a proposed mathematical model to describe the electrical characteristics for a thermoelectric generator. The TEG model considers the use of second order polynomial equations, the boundary conditions, and characteristic shape for the operation of a TEG. The proposed TEG model has the following advantages: 1) suitable for sustainable energy and power applications, 2) emulate the...
In this paper, we present a maximum power point tracker and estimator for a PV system to estimate the point of maximum power, to track this point and force it to reach this point in finite time and to stay there for all future time in order to provide the maximum power available to the load. The load will be composed of a battery bank. This is obtained by controlling the duty cycle of a DC-DC converter...
Because to the nonlinear behavior of the photovoltaic (PV) cells, dc-dc power converters are added for matching the load to the photovoltaic modules (PVM). In this paper, we use mathematical models in order to examine the behavior of the off-grid photovoltaic system composed by: PV generator, dc-dc converter and dc motor. We compare different converter topologies (step-up, step-down and step-down/step-up)...
The development of systems implementing renewable energy sources is essential to society's evolution and survival. Currently the major source for electric energy is the burning of fossil fuels; thus, it is a problem because of two reasons: it increases the emission of harmful gases to our atmosphere and it is an energy source that will not last forever. In our present time the amount of energy produced...
This work-in-progress presents the research and educational activities designed to create a synergy related to aspects of the power electronics laboratory experience using alternative energy, and dissemination of knowledge related to the impact of renewable energy as part of the solution to achieve a sustainable future & economy for the society, as well as to the national security based on the...
This paper presents a Simulinkreg Model that has been developed for the performance evaluation and simulation of Solar Power Generating or Solar Thermal Power Plants in Puerto Rico with the Compound Parabolic Concentrator as the solar collector of choice. There are several costly and sophisticated commercial software programs that perform this task but, this tool is aimed at performing initial evaluations...
A maximum power point tracking for separately excited DC motors fed from photovoltaic panels through Cuk and SEPIC converters is given. The Linear Reoriented Coordinate Method is employed to determine the optimal voltage of PV panels. A sensorless positive feedback of motor velocity with a developed control law is realized. Experimental results obtained from both, Cuk and SEPIC converters from an...
Until now the use of equivalent circuit for induction motor has been limited for steady state analysis. The equivalent circuits for dynamic simulation proposed until now, are not able to obtain the transient response of the induction motor, because they lack of mechanical component representations. Complex non-linear matrices are used instead. Here electrical analogy of mechanical system is integrated...
This paper presents a maximum power tracking method for DC motor fed from photovoltaic modules (PVM) through step-down power converter. This method employs positive feedback of motor speed; therefore, only DC motor speed measurements are required. The designed control law is based on mathematical model of DC motor and power converter, and also, variations of optimal maximum power point (MPP) are considered...
This paper describes the detailed implementation of a novel tool for simulating the behavior of photovoltaic devices under variable weather conditions, in which the effect of irradiance, temperature and wind speed are considered. The tool also takes into account the effect of the thermal capacitance of photovoltaic dispositives and it is suitable to work on both long-term and transient simulations...
This paper presents a maximum power point tracker method using sliding mode control for a photovoltaic module to produce and maintain the maximum power possible for a configuration of the array and the environmental variables. This is obtained using a variable structure control system to control the duty cycle of a DC-DC converter. The variable structure control system is a sliding mode control that...
This paper presents a proposed mathematical model to describe the electrical characteristics for a fuel cell (FC). The FC model considers the use of transcendental equations, fractals, and the boundary conditions and characteristic shape for the operation of a fuel cell. The proposed FC model has the following advantages: (1) suitable for sustainable energy and power applications, (2) emulate the...
Fuel cells are one of the key enabling technologies for future hydrogen economy. For the last 20 years applications for the fuel cells are mostly replacing internal combustions engines, and providing power in stationary and portable power applications. But the history of the fuel cells is more than the last 20 years; actually it has more than 150 years! It is the purpose of this paper to present the...
The purpose of this paper is to present an alternative maximum power point tracking, MPPT, algorithm for a photovoltaic module, PVM, to produce the maximum power, Pmax, using the optimal duty ratio, D, for different types of dc-dc converters and load matching. The proposed algorithm has the advantages of maximizing the efficiency of the power utilization, can be integrated to other MPPT algorithms...
This paper presents a non-traditional method for the approximation of the photovoltaic module, PVM, exponential model using fractional polynomials where the shape, boundary conditions and performance of the original system are satisfied. The proposed Maximum Power Point Method uses these fractional polynomials to obtain analytically the optimal solutions for the maximum power, Pmax for the PVM operation,...
This paper presents a non-traditional method and algorithm to calculate the inverse solution for a one-dimensional function without the diffeomorphism property. The proposed method is called the linear reoriented coordinates method (LRCM). The LRCM is a very powerful and useful too to calculate the symbolic solutions for transcendental functions where the inverse function is not possible to calculate...
This paper proposes an analytical model for the performance of photovoltaic modules to be used in distributed power generation. The proposed solar panel model uses the electrical characteristics provided by the manufacturer data sheet. The required characteristics are short-circuit current (Isc), open-circuit voltage (Voc ) and the temperature coefficients of Isc and Voc . The proposed model takes...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.