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In this paper the control of a grid-tied PV (Photovoltaic) Cascaded H-bridge inverter is discussed. The operation principle of the considered circuit is analyzed and a particular attention is paid to the different modulation techniques well-suited for this configuration. Moreover, some critical implementation issues are addressed, while a fair comparison between the proposed modulation scheme and...
Thermal Feedback Blocks are a viable approach to perform thermal and electrothermal simulations of electronics systems with very fast-switching inputs, for which the coupling of a finite-element method thermal solver with a physics-based or a circuit simulator cannot be used. In this work, we describe a RC-based thermal network improving the conventional Foster and Cauer solutions, which is used to...
Overtemperature occurring in silicon solar panels subject to partial shadowing are reduced by means of a new bypass circuit. The circuit exploits a series connected power MOSFET which sustains part of the reverse voltage developing across the shaded solar cell. Neither power supply nor control logic are required, resulting in an appealing advantage with respect the other active bypass circuits. Experiments...
In this paper, an effective circuit for both voltage and current zeroing of single solar panels embedded in a solar field is presented. The circuit interrupts the panel current by means of a solid-state power switch and zeros the panel voltage by means of an electromechanical relay. Each solar panel can be either connected or disconnected from the string independently from each other. The circuit...
This paper presents a fast and accurate approach for the dynamic electrothermal analysis of photovoltaic (PV) plants with a cell-level discretization. A circuit model is developed for the elementary cell, and an equivalent electrical network is automatically built in a preprocessing stage to account for the power-temperature feedback. The PV plant under analysis is represented as an electrical macrocircuit...
Small shadows are often neglected in the prediction of energy producible by photovoltaic systems. This is mostly due to the lack of specific tools available in commercial design software packages, which neither allow realistic drawings nor can account for individual solar cells currents. In this paper the effects of small shadows are accurately analyzed with reference to two special cases, a TV antenna...
This paper propose a new system to short circuit a photovoltaic panel, embedded in a photovoltaic string, with the aim to ensure safe operation of firemen in case of fire. The circuit is activated by a wireless command and doesn't require additional wiring. Moreover it is self powered by the solar panel itself and can be either turned on or turned off in a fully reversible way.
In this paper a new monitoring system, suitable for large photovoltaic fields, is presented. Differently from others available monitoring systems the new approach is based on a sensor network which collects detailed information about the electrical performances of each string forming a photovoltaic plant. A devised electronic board has been specifically developed and prototyped which embeds innovative...
In this paper the design and the control of a PV (Photovoltaic) AC-module based on a double coupled-inductors boost topology are discussed. This circuital configuration allows obtaining of the high voltage amplification needed in individual panel applications. The operation principle of the proposed circuit is analyzed and a proper calibration of the PV panel simulation model is performed. The adopted...
In this paper, a novel circuit model of photovoltaic (PV) cells is presented, which exploits the thermal equivalent of the Ohm's law and the macromodeling technique to describe the temperature dependence of all key parameters and allow a specific temperature for each cell. The model is compatible with commercial SPICE-like simulation tools, and suitable to be employed for dynamic electrothermal (ET)...
In this paper, an innovative topology performing a Power Line Communication on DC bus, with series connected photovoltaic modules, is presented. The circuit ensures the transmission on the DC bus even if the transceivers cannot share the same reference voltage. Moreover, a circuit solution avoiding that the operating point of the photovoltaic string can be affected is proposed. The circuit is provided...
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