Examinando por Autor "Londoño, William"
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- PublicaciónSólo datosEmulation of a Photovoltaic Module Using a Wiener-Type Nonlinear Impedance Controller for Tracking of the Operation Point(Applied Computer Sciences in Engineering, 2017-10-01) López-Santos, Oswaldo; Merchán-Riveros, María C.; Salas-Castaño, Maria C.; Londoño, William; García, GermainThis paper proposes a control method to provide the function of Solar Panel Emulation (SPE) to a low-cost programmable DC source. The proposed control operates with base on the error between measurement of the conductance connected at the output of the SPE and the conductance obtained evaluating the I-V characteristic of the panel model. The principle of operation is that the output of the controller modifies the value of the voltage introduced into the W-Lambert function to obtain the corresponding current enforcing the regulation of the measured conductance. In this paper, a controller composed by a nonlinear static gain and a conventional PI controller is proposed. The controller architecture configures a Wiener system structure which ensures the stable convergence of the real SPE variables to the values defined by the model. Simulation results are presented evaluating the dynamic performance of the system for irradiance and load variations. SPE method is implemented using simple measurement and conditioning circuits interacting with an application developed in LabVIEW through a data acquisition card. This implementation provides a complete solution highly applicable in research and industrial development.
- PublicaciónSólo datosLow-Cost Alternative for the Measurement of Water Levels in Surface Water Streams(Sensors & Transducers, 2017-12-30) Peña, Luis E.; Murcia Moreno, Harold Fabián; Londoño, William; Botina, HelmanFlood risk management and water resources planning involve a deep knowledge of surface streams so that mitigation strategies and climate change adaptations can be implemented. Commercially, there is a wide range of technologies for the measurement of hydroclimatic variables; however, many of these technologies may not be affordable for institutions with limited budgets. This paper has two main objectives: 1) present the design of an ultrasound-based water level measurement system, and 2) propose a methodological alternative for the development of instruments, according to the needs of institutions conducting monitoring of surface waterbodies. To that end, the proposed methodology is based on selection processes defined according to the specific needs of each waterbody. The prototype was tested in real-world scale, with the potential to obtain accurate measurements. Lastly, we present the design of the ultrasound-based water level measurement instrument, which can be built at a low cost. Low-cost instruments can potentially contribute to the sustainable instrumental autonomy of environmental entities and help define measurement and data transmission standards based on the specific requirements of the monitoring.