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This paper presents a comparative study and analysis between various models of Photo-Voltaic (PV) used on solar vehicles, which have been formulated exclusively using the data sheet parameters. The models used in this paper include Single Diode Model, Two-Diode Model, and the Ideal Single Diode Model.
Coupling of a Long Term System (LTS) with a Short Term System (STS) of a hydrogen-based microgrid is considered here in this work to control the operation of a set of electrolyzers that produce hydrogen from renewable energies. Both systems are based on Model Predictive Control (MPC) ideas. The LTS manages the on/off conditions of the electrolyzers taking into account control and prediction horizons...
Solid Oxide Fuel Cells (SOFC) present many advantages to generate electricity from natural gas, such as high efficiency, and little noise. However, the most important advantage of SOFC is its ability to operate at high temperatures. Their high operating temperature makes possible to use natural gas as fuel, so external hydrogen is not necessary for operation. In addition, in hybrid systems with cogeneration,...
This paper deals with the problem of stabilization of the Roesser type polynomial discrete-time 2-D Takagi-Sugeno (T-S) fuzzy system by using the sum of squares (SOS) approach. First, we derive a stabilization conditions based on polynomial Lyapunov functions that contain quadratic Lyapunov functions as a special case. Second, a non-quadratic stabilization conditions of the polynomial fuzzy systems...
This paper is concerned with the design of robust observer based controllers for continuous-time linear systems with parameter uncertainties. The proposed method allows one to compute simultaneously the observer and controller gains by solving a single bilinear matrix inequalities (BMI), which becomes an linear matrix inequalities (LMI). Numerical examples are given to illustrate the validity and...
The purpose of this paper is to design a congestion controller for Networks TCP/IP Routers, while the available link bandwidth is modeled as a time-variant disturbance. Considering the new uncertain TCP flow model, a memoryless H∞ robust controller is designed to guarantee the stability and performance under time-varying network conditions. The controller parameters are obtained through standard linear...
This paper tackles the H∞ filtering problem for 2-D discrete stochastic systems. The approach is based on the Fornasini-Marchisini (FM) model. The objective is to propose a new design with sufficient condition via LMI formulations. Less conservative results are obtained by introducing additional free parameters by using the projection Lemma. This method provides extra degree of freedom in optimization...
The problem of synthesizing stabilizing state-feedback controllers is solved when the closed-loop system is required to remain positive, for the class of 2-D linear systems described by the Fornasini-Marchesini second model. First, a constructive necessary and sufficient condition expressed as a Linear Programming problem is provided for stabilization of these systems when the states must be nonnegative...
An Energy Management System (EMS) to balance the production of renewable sources with the consumption by a set of electrolization units is proposed here based on Model Predictive Control ideas (MPC). This EMS regulates the operating point of each electrolyzer and its connections or disconnections using a Mixed-Integer-Quadratic-Programming algorithm. A case study is given for an installation composed...
This paper is concerned with the energy management of a micro-grid composed of photovoltaic/ wind/diesel sources used to supply household loads. The control strategy manages the power flow between the power sources and the loads, which ensures the minimization of the installation operating cost, the safe operating for the battery bank while minimizing the use of the diesel engine. The strategy is...
This paper focuses on the powers control of a photovoltaic generator connected to a single- phase grid. In addition to the solar panels, the system is equipped with a dc-dc converter, which allows the panels' maximum power point to be tracked, a single phase inverter, a filter, and loads, all connected to a single phase utility grid. In this study, the voltage oriented control method is used to control...
This paper deals with two dimensional (2D) systems with variable delays. More precisely, conditions are developed to study the asymptotic and exponential stability of 2D Roesser-like models with variable independent delays affecting the two directions. Based on proper definitions of 2D asymptotic and exponential stability, sufficient conditions are developed, expressed using Linear Matrix Inequalities,...
This paper is devoted to the stabilization of positive Takagi-Sugeno (T-S) systems with unmeasurable premise variables in the continuous case. More precisely, two approaches have been presented. The first approach is based on a representation of the estimation error by that of the case where the decision variables are measurable but affected by disturbance. In the second approach, the expression of...
This paper investigates the design of H∞ static output-feedback controllers for Takagi-Sugeno fuzzy systems with time delays. Based on a fuzzy Lyapunov-Krasovskii functional, a sufficient stability condition in terms of Bilinear Matrix Inequalities is derived for the stabilization of these systems, guaranteeing an H∞ performance. To solve the nonconvexity involved in this condition, a cone complementarity...
This paper derives sufficient conditions for the asymptotic stability of those 2D switching systems than can be represented by Roesser models in a discrete grid. Preliminary results are based on using common Lyapunov functions, giving LMI conditions for stability. To reduce the conservativeness of this preliminary approach, it is proposed in this paper to use a multiple Lyapunov function, which also...
This paper solves the stabilization problem for a class of linear discrete-time systems with delay, for which the states must not take nonnegative values whenever the initial conditions are nonnegative. In particular, the synthesis of state-feedback controllers is first solved in terms of Linear Programming for the unbounded controls case. This result is then extended to stabilization by nonnegative...
The work presented in this paper concerns the speed control of a Separately Excited Direct current Motor (SEDM) by use of a Maximum Power Point Tracking (MPPT) strategy applied to a Boost DC-DC converter. A PV generator is used for energy supply. The use of conventional PI controller for speed regulation is due to low steady-state error, low costs, fast control and simple structure. The MPPT is implemented...
A study of some MPPT algorithms and type (central or distributed) for an off-grid photovoltaic installation is presented. First, the efficiency of using MPPT algorithms in a specific application (water pumping) has been proved. Then, some widely used MPPT algorithms (Table Look-up Neuro-fuzzy, Incremental Conductance and Perturb and Observe) are compared, independently on the application. Their performances...
This paper presents the formulation of a control strategy based on model predictive control ideas to produce hydrogen from renewable energy in an offshore platform. Power generation based on wave and wind energy is considered as energy source which feeds a set of electrolyzers that produces hydrogen. The proposed advanced control system allows to regulate the operation of the electrolyzers, taking...
In this paper, an energy management study of a photovoltaic-windsystem for a non-controllable load supply is presented. The control methodology decides on the switching between the installation' components. The decision is made by an energy management algorithm that depends on the photovoltaic power, the wind turbine power, the battery' bank state of charge and the load demand. The algorithm aims...
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