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This study presents the design of a control strategy for alternating current (AC) programmable electronic loads (PEL) applied to test scenarios in power microgrids. The control strategy is based on hysteresis current control (HCC) for the operation of a three-phase inverter to emulate load profiles. The PEL's design is divided into power and control stages to identify operating principles. The topology used is a three-phase four-wire AC PEL, using star and split DC bus connections. The DC link voltage is controlled through a Buck converter based on the power balance of the system. The PEL has been designed to operate in constant power, impedance, and current modes. It is concluded that PEL simulations function properly, representing power stage wavelengths and control signs according to theory. [ABSTRACT FROM AUTHOR]

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The path to achieve an increased use of renewable energy requires that the technical, political, and economic challenges are addressed in an integrated way. The objective of this paper is to present such socio-technical integration through the analysis of lessons learned in renewable energy in Puerto Rico. The pitfalls in the renewable energy market from technical, social and market acceptance perspectives are presented, as well as the main lessons on needed characteristics: a clear selection process of renewable energy suppliers to ensure socially and technically suitable projects, consistency in administrative decisions to achieve trust among stakeholders, effective inclusion of local communities for social acceptance, and transparency in establishing technical interconnection requirements. Considering the obstacles in the large-scale renewable market in Puerto Rico, distributed energy is presented as viable alternative that can better address social and technical challenges of renewable systems in tropical locations, in particular community microgrids. [ABSTRACT FROM AUTHOR]

Copyright of Revista Espacios is the property of Talleres de Impresos Oma and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Visión Electrónica is the property of Fondo de Universidad Distrital Francisco Jose de Caldas and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this paper we review about some control techniques used in electrical microgrids, with a special emphasis on those used for the operation in island mode, which is an expected feature in rural microgrids. On the other hand, the dispatch management is presented as a control strategy that impacts the energy quality of the microgrid associated with the concept of Hosting Capacity, which, in this specific case, it refers to the restrictions the system may have about chargeability given the generation. Finally, it is important to mention that this work was developed in the framework of the project: "Incremento en las estrategias sustentables en el uso del recurso de energía eléctrica para la población vulnerable del departamento de Cundinamarca". [ABSTRACT FROM AUTHOR]