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This paper proposes a Real-time optimization (RTO) strategy for Fuel Cell Hybrid Power Sources based on Global Extremum Seeking (GES) control of the air flow. The performance is shown in comparison with Static Feed-Forward RTO strategy.
This paper presents two different ways of identifying possible defects for electronic components in order to achieve predictive maintenance. The analysis is performed on the components of a power station used in telecommunication. In the first part of the paper is performed a defect analysis based on fuzzy graphs. This leads to the components causing the most accidental stops. In the second part an...
In this paper we present a solution for the classification of different patterns from seismic signals generated by different human activities for which an automatic recognition is required. Some a priori known signals were available, which gave us the possibility to represent them in feature space in order to capture their global characteristics. The classification of signals is based on computing...
The paper proposes a solution for measuring the current consumption on the transmission lines for detecting the losses that may occur. The solution is non-invasive: the sensors determine the current by analyzing the electric field around the isolated conductor, it is fully mobile and easy to install: sensors are “clamp” type and can be placed on insulated conductors, data is transmitted wirelessly...
A new Extremum Seeking Control (ESC) scheme is proposed in this paper for multimodal function with two dimension (2D), named as ESC 2D — scheme. This ESC 2D-scheme is a Single Input — Double Outputs (DISO) control system that combine two ESC 1D-schemes of asymptotic perturbed type. Each ESC 1D-scheme has two control loop. The scanning loop generates the signal that sweep the searching space in order...
Four new energy control strategies are proposed here for the Fuel Cell Hybrid Power Source (FCHPS) used in stationary and mobile FC application (such as the FC backup source for a smart-house and FC vehicle, respectively) based on the Load Following (LF) control and Maximum Efficiency Point Tracking (MEPT) control of the fueling rates. The LF control approach is used to design simple strategies of...
In this paper, four energy control strategies are proposed and analyzed for the standalone Renewable/Fuel Cell Hybrid Power Source (RES/FC HPS). The concept of the load following (LF) and Maximum Efficiency Point Tracking (MEPT) is used to control the fueling rates. A standalone RES/FC HPS uses at least one Renewable Energy Sources (RES) and a Polymer Electrolyte Membrane (PEM) Fuel Cell (FC) as backup...
This paper is focused on the nonlinear behavior of the DC-DC converters. In the first part of this paper, the basic topologies of the DC-DC converters are analyzed and modeled. The general linear model for the Buck, Boost and Buck-Boost topologies is presented and used in the simulation performed in the second part of this paper. Also, the main tools used to study their nonlinear behavior are shown...
As it was mentioned in the first part, this paper is focused on the nonlinear behavior of the DC-DC converters. The Buck converter was chosen to apply different tools in order to analyze the stability of operation under voltage and current control. Also, besides the qualitative information given by the graphical methods used, the performances of the control techniques are evaluated in time and frequency...
In the second part of this paper the Maximum Power Point Tracking (MPPT) technique for photovoltaic (PV) panels based on modified Extremum Seeking Control (mESC) is analyzed. Even the mESC scheme differs from the classical ESC schemes only on the filters' topology and their used parameter, this proposed control improves quite enough the performances of the PV energy harvesting in comparison with a...
In first part of this paper the Maximum Power Point Tracking (MPPT) technique for photovoltaic (PV) panels based on Extremum Seeking Control (ESC) scheme is analyzed. It is important to know how much energy can be harvested from a PV that uses a MPPT controller. In this paper, the ESC schemes are analyzed in the frequency domain. The modified ESC (mESC) and high-order ESC (hoESC) schemes are considered...
In this paper a performances analysis of the Extremum Seeking Control (ESC) scheme applied to the dual-inputs single-output (DISO) systems is presented. These ESC 2D-schemes contain two ESC 1D-schemes that have a common input: the output of the DISO system. The performance of the basic high-order ESC (bhoESC) and band-pass filter ESC (bpfESC) 2Dschemes will be analyzed here based on the two orthogonal...
In this paper an analysis of the Extremum Seeking Control (ESC) 2D-scheme for the dual-inputs single-output (DISO) systems is presented. The ESC 2D-schemes have two loops where the output signal is obtained based on two different ESC algorithms proposed in the literature. The basic high-order ESC (bhoESC) 2D-scheme and an improved ESC variant will be analyzed here based on the two orthogonal dither...
In this first part of the paper, the architecture of the Hybrid Power Source based on Maximum Power Point tracking controller to harvest the energy available from used Renewable Energy Sources is presented. Usually, the energy harvesting is based on Extremum Seeking Control (ESC) loop. Two ESC schemes are proposed and analyzed in relation with the classical ESC schemes: (1) the modified ESC scheme...
In the second part of this paper, the dither persistence on the Extremum Seeking Control (ESC) loop is analyzed. The ESC scheme is usually used on Maximum Power Point (MPP) tracking controller to harvest the energy available from used renewable or green Energy Sources (ES). Two ESC schemes are analyzed in relation with dither persistence on output reference current: (1) the modified ESC scheme (named...
An analysis of the Fuel Cell Hybrid Power Source (FCHPS) for pulsed current loads was presented in this paper. Usually, hybridization of a FCHPS is made by using either a batteries or an ultracapacitors stack, but using both devices together can provide a powerful Energy Storage System (ESS) with the features of both high energy density and high power density, which is significant for FC vehicles...
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