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Dynamic characteristics and improved MPPT control of PV generator

Frontiers in Energy 2013年第3期7卷 342-350页

作者： Houda BRAHMI rachid dhifaoui Higher Institute of Medicals Technologies (ISTMT) 9 Rue ZouhairEssafi 1006 Tunis Tunisia National Institute of Applied Sciences and Technology (INSAT) Centre Urbain Nord BP 6761080 Tunis Cedex Tunisia

This paper presents a mathematical model of photovoltaic （PV） module and gives a strategy to calculate online the maximum power point （MPP）. The variation of series and shunt resistor are taken into account in the model and are dynamically identified using the Newton-Raphson algorithm. The effectiveness of the proposed model is verified by laboratory experiments obtained by implementing the model on the dSPACE DS1104 board.

关键词： modeling of photovoltaic (PV) generator maximum power point tracking (MPPT) estimation para meters real time controller

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Analytical Approach for the Systematic Research of the Periodic Ferroresonant Solutions in the Power Networks

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Energy and Power Engineering 2011年第4期3卷 450-477页

作者： Fathi Ben Amar rachid dhifaoui 不详

Ferroresonance is a complex and little known electrotechnical phenomenon. This lack of knowledge means that it is voluntarily considered responsible for a number of unexplained destructions or malfunctioning of equipment. The mathematical framework most suited to the general study of this phenomenon is the bifurcation theory, the main tool of which is the continuation method. Nevertheless, the use of a continuation process is not devoid of difficulties. In fact, to continue the solutions isolats which are closed curves, it is necessary to know a solution belonging to this isolated curve (isolat) to initialise the continuation method. The principal contribution of this article is to develop an analytical method allowing systematic calculation of this initial solution for various periodic ferroresonant modes (fundamental, harmonic and subharmonic) appearing on nonlinear electric system. The approach proposed uses a problem formulation in the frequency domain. This method enables to directly determine the solution in steady state without computing of the transient state. When we apply this method to the single-phase ferroresonant circuits (series and parallels configurations), we could easily calculate an initial solution for each ferroresonant mode that can be established. Knowing this first solution, we show how to use this analytical approach in a continuation technique to find the other solutions. The totality of the obtained solutions is represented in a plane where the abscissa is the amplitude of the supply voltage and the ordinate the amplitude of the system’s state variable (flux or voltage). The curve thus obtained is called “bifurcation diagram”. We will be able to then obtain a synthetic knowledge of the possible behaviors of the two circuits and particularly the limits of the dangerous zones of the various periodic ferroresonant modes that may appear. General results related to the series ferroresonance and parallel ferroresonance, obtained numerically sta

关键词： Transformer Ferroresonance Fundamental Mode Harmonic Mode Subharmonic Mode Fractional Mode Isolat Limit Point Bifurcation Dangerous Zone

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