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The paper proposes an extremal control method through the design of a RST controller for a step-down DC-DC Buck Converter fed by a BGSP - P225 PV array. The input voltage for the converter is kept at the photovoltaic panel's maximum value by means of search algorithms for determining the Maximum Power Point. The algorithms used are Coggin's algorithm for the single variable dependent model P(U) and...
The main issue of paper consist in proposing a few algorithms and control structures for PV grids which can increase predictability and flexibility degrees with respect to specific disturbances. The starting point of our model is the division of the PV grid in subgroups of optimal dimension and pairings that offer minimal variation between the quantity of energy needed and the one prognosticated....
The goal of this article is to introduce a solution for modeling and control of a photovoltaic power plant. Two issues are addressed in this aim. The first one is concerned with the mathematical model of a photovoltaic cell and to tracking of the maximum power point. The second problem deals with the boost converter: how to obtain a desired and stable output voltage even though the input represented...
The proposed approach presents a real time control structure for managing a photovoltaic grid so as to obtain a stabilized output load, in case of charge and functioning disturbances. Its applicability is validated on a control structure of multiple PV (sub) groups, connected in parallel to provide energy, a situation usually encountered in the renewable energy industry, Virtual Power Plants (VPP),...
Modern aero-naval traction systems contain two or more propulsion elements. One of the main challenges consist steering control in case one or more propulsion elements fails. The paper presents solution of real time (re)balancing a parallel control structure and maintaining the ratio between two engines groups. Applicability is proved on a control structure of the ratio where using two groups of propellers,...
The objective of this paper is to design a real-time control solution for chemical processes, namely the ethylene reactor, the key-installation in the petrochemical industry. The controller used is lag or lead controller, a simple yet suitable control tool. This article deals with the problem of finding all first order controllers that stabilize a given LTI continuous time or discrete time plant and...
For the attractor determination, we propose in this paper a new approach based on the definition of a comparison system by special description of the linearized model of the process around an operating state which correspond to a diagonalization or if it is not possible to the description with a matrix on the arrow form, and the use of aggregation techniques. As an illustration, this approach is applied...
The main objective of this work is the design and implementation a numerical control solution for the ethylene reactor, the key-installation in the petrochemical industry. We introduce some technological characteristics of this petrochemical process and the main aspects about the control system solution for the process plant. A robust control strategy for numerical control systems are proposed. Finally,...
The article represents a performance solution of (re)balancing a parallel control structure and maintaining the ratio between two adjustment quantities. The solution is based on the structures introduced by Visioli [1]. Applicability is proved on a control structure of the ratio where using two groups of tanks, a situation that has been encountered in the chemical industry, pharmaceutical industry...
This paper analyses classic solutions and proposes a precise structure solution for the ratio control of nonlinear processes blend stations. The main feature of the proposed structure is to give a good ratio performance for both set-point changes and load disturbances that might occur in any one of the loops. For two or more included loops a nonlinearity compensator or multiple model structure is...
Systems with multiple models or multi-controller structure represent one of the successful solutions for the real-time control of the nonlinear or multi-regime processes. The use of these structures imposes solving some specific problems, like best algorithm selection or control algorithm switching. The paper proposes a method for switching the algorithms of the multiple-models structure, based on...
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