Petri Nets Models for Analysis and Control of Public Bicycle-Sharing Systems

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Modeling and control of parallel multicell chopper using Petri nets

International audienceIn this paper a new class of converters power will be studied (Parallel Multicell Chopper). The topology of these chopper is based on a combination of n cells switching interconnected via independent inductors. This type of choppers is a new DC/DC static power converter which has an output current equals to n times the source current where n is the number of cells . After recalling the dynamical equations of the converter, its hybrid dynamical behavior and properties are highlighted. This particular hybrid system induces new and difficult control problems, such problem can be tackled by a new control concept based on Petri net. The PMC achieves an output current equal to n times the input current of the chopper, the major disadvantage of this type of converter is the imbalance branches of current with increasing number of cells. Therefore, modeling and control with Petri net is proposed to solve the problems of imbalanced of currents and the voltage output regulation with variation of the load. This approach is compared to the conventional PWM control

ZTN OBSERVABILITY FOR PARALLEL MULTI-CELL CHOPPER

International audienceIn most industrial processes that use electrical energy as a source of tension or current, requiring a power circuit to control of these physical states.This paper deals with observability problems of the parallel multi-cell chopper. This type of choppers is a new DC/DC static power converter. After modeling of the power converter, its hybrid dynamical behavior and properties are highlighted. The observability properties of the state vector is studied from the new observability concept ( The Z(TN)- observability ). Following this observability analysis an adequate sensor placement is proposed after an observability analysis and a super-twisting observer has been proposed, that ensures finite-time convergence and robustness under bounded perturbations. That is why, its estimation by means of an observer becomes an attractive and economical solution. The suitability of the proposed strategy is proved by extensive computer aided simulations employing a comprehensive model of the system considering noisy measurements and load variations

Observability analysis for parallel multi-cell chopper

International audienceThis paper deals with observability problems of the parallel multi-cell chopper. This type of choppers is a new DC/DC static power converter which has an output current equals to n times the source current where n is the number of cells. After recalling the dynamical equations of the converter, its hybrid dynamical behavior and properties are highlighted. This particular hybrid system induces new and difficult observability problems, such problem can be tackled by a new observability concept (The Z(TN)-observability). Following this observability analysis an adequate sensor placement is proposed after an observability analysis and high order sliding mode observer designs are proposed. It is important to note that the use of physical extra sensors in order to measure the current in each phases increases the cost and the complexity of the system. That is why, its estimation by means of an observer becomes an attractive and economical solution. Our approaches are attested by several numerical simulations considering noisy measurements and load variations

Modeling and control of parallel multicell chopper using Petri nets

International audienceIn this paper a new class of converters power will be studied (Parallel Multicell Chopper). The topology of these chopper is based on a combination of n cells switching interconnected via independent inductors. This type of choppers is a new DC/DC static power converter which has an output current equals to n times the source current where n is the number of cells . After recalling the dynamical equations of the converter, its hybrid dynamical behavior and properties are highlighted. This particular hybrid system induces new and difficult control problems, such problem can be tackled by a new control concept based on Petri net. The PMC achieves an output current equal to n times the input current of the chopper, the major disadvantage of this type of converter is the imbalance branches of current with increasing number of cells. Therefore, modeling and control with Petri net is proposed to solve the problems of imbalanced of currents and the voltage output regulation with variation of the load. This approach is compared to the conventional PWM control

Modeling and control of parallel multicell chopper using Petri nets

International audienceIn this paper a new class of converters power will be studied (Parallel Multicell Chopper). The topology of these chopper is based on a combination of n cells switching interconnected via independent inductors. This type of choppers is a new DC/DC static power converter which has an output current equals to n times the source current where n is the number of cells . After recalling the dynamical equations of the converter, its hybrid dynamical behavior and properties are highlighted. This particular hybrid system induces new and difficult control problems, such problem can be tackled by a new control concept based on Petri net. The PMC achieves an output current equal to n times the input current of the chopper, the major disadvantage of this type of converter is the imbalance branches of current with increasing number of cells. Therefore, modeling and control with Petri net is proposed to solve the problems of imbalanced of currents and the voltage output regulation with variation of the load. This approach is compared to the conventional PWM control

Scheduling problems with energy consideration: State of the art and opportunities

The target of this study is to find an appropriate research framework on the basis of the main published works designed to resolve the scheduling issues with energy aspect consideration. Relatively, the major part of work is placed in the context when modeling scheduling is subject only to one constraint and criteria, which in reality is not constantly the case. This study is handled in the framework where job transactions are interrupted at the similar time by set of technological, environmental and especially energetic constraints that has been previously little discussed in the literature. As soon as the objective functions, constraints, models, approaches and the scheduling environments that are defined as the fundamental elements of scheduling problems resolution are determined, a literature review of the present state of the art is introduced. Then, an analysis is carried out to highlight the fundamental ideas leading to fix a future research area that still require a huge deal of attention