Helmo Kelis Morales Paredes

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Smart grids offer a new challenging domain for power theories and compensation techniques, because they include a variety of intermittent power sources which can have dynamic impact on power flow, voltage regulation, and distribution losses. When operating in the islanded mode, smart micro-grids can also exhibit considerable variation of amplitude and(More)
Smart grids are characterized by the availability of distributed energy resources (DER), including power switching interfaces (PSI) to connect to the grid. This creates a new scenario for the management of power grids, because DER increase the power capability and flexibility of the network at the expense of a higher complexity of control. If properly(More)
This paper presents a flexible control technique for power electronics converters, which can function as an active power filter, as a local power supply interface, or perform both functions simultaneously. Thus, it can compensate for current disturbances while simultaneously injecting active power into the electrical grid, transforming the power converter(More)
Considering the Conservative Power Theory (CPT), this paper proposes some novel compensation strategies for shunt passive or active devices. The CPT current decompositions result in several current terms, which are associated with specific physical phenomena (average power consumption P, energy storage Q, load and source distortion D, unbalances N). These(More)
Smart micro-grids offer a new challenging domain for power theories and metering techniques, because they include a variety of intermittent power sources which positively impact on power flow and distribution losses, but may cause voltage asymmetry and frequency variation. Due to the limited power capability of smart micro-grids, the voltage distortion can(More)
This work presents a technique to allow the use of single-phase power converter tied to the grid utility both as active power filter (APF), mitigating power quality disturbances due to the load, and as distributed generation (DG) interface, connecting a local renewable power source into the grid. The main goal is to ensure that the power processed by the(More)
Four-wire microgrids (MGs) and distribution systems are inherently unbalanced with the presence of negative and zero sequence components in voltages and currents. In small autonomous systems, the imbalance, in addition to the harmonic distortion produced by nonlinear loads, can significantly affect the power quality, loadability, and stability of the(More)
This article proposes the use of PSCAD/EMTDC to model and simulate a three-phase x-ray machine. The model is an alternative tool to power quality studies, load connection impact analysis and power factor correction in the electric power distribution systems. The developed model is used to identify and quantify potential impacts of the X-ray machine in the(More)
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