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In this paper the problem of predefined-time exact tracking of fully actuated and unperturbed mechanical systems is solved by means of a continuous controller. It is assumed the availability of the state and the desired trajectory as well as its two first derivatives. This is accomplished introducing the idea of second-order predefined-time stable systems, which is based on the nested application...
This work proposes an event-based PI control scheme focused on FOPTD (First Order Plus Time Delay) processes with simple tuning methods. The scheme, called for short predictive SSOD-PI or PSSOD (Predictive Symmetric Send On Delta)-PI, which only considers two degree of freedom to determine the expected rate of events as well as the set-point and load disturbance rejection responses. The event-based...
A maximum power point tracker (MPPT) for photovoltaic (PV) cells, PV modules (PVM) and PV arrays is presented using a dynamic optimal voltage estimator to estimate the voltage at which a PV cell generates its maximum power, and, using a DC-DC converter, to force the PV cell to reach and operate at voltage in a finite time and to stay there for all future time. The optimal voltage estimator reads the...
Because to the nonlinear behavior of the photovoltaic (PV) cells, dc-dc power converters are added for matching the load to the photovoltaic modules (PVM). In this paper, we use mathematical models in order to examine the behavior of the off-grid photovoltaic system composed by: PV generator, dc-dc converter and dc motor. We compare different converter topologies (step-up, step-down and step-down/step-up)...
We present the main elements for a decision support system for portfolio management in the Mexican market, including the financial investments consideration for a database, the uncertainty representation in scenario trees and the requirements for a portfolio optimization model. We used a stochastic programming approach to formulate the multistage optimization model, modified with new constraints and...
This paper presents a maximum power point tracker method using sliding mode control for a photovoltaic module to produce and maintain the maximum power possible for a configuration of the array and the environmental variables. This is obtained using a variable structure control system to control the duty cycle of a DC-DC converter. The variable structure control system is a sliding mode control that...
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