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Hybrid LV ac/dc microgrids are being considered for commercial buildings which bring new design requirements for the multiport converter aimed to interface both ac and dc grids. In this paper, we explore the potential to use two well-developed topologies for this targeted application. An optimization-based genetic algorithm which allows to find the best possible choices among different off-the-shelf...
The aim of this paper is to analyze the control of several wind power generators with one common power converter. This configuration is especially useful for offshore wind farms with a VSC-HVDC transmission to an onshore system. A comparison with a more conservative topology, where one generator is connected to one power converter, is done focusing in the total power extraction. Scalar-controlled...
The present paper addresses the control of doubly fed induction generators under unbalanced voltage sags considering the converter limits. A control strategy is proposed by choosing certain current reference values in the positive and negative sequences so that the torque and the DC voltage are kept stable during such unbalanced sags considering the converter limits.
The article presents a genetic algorithm (GA) application to find the best location and reactive power injection of a FACTS device in a power system. The GA is employed to increase the energy efficiency of the system, considering that only the best individuals of a population are selected to create new possible solutions and these are meant to improve the energy efficiency of the system; the node...
The present paper deals with the integration of electrical, control and mechanical models in a single platform to evaluate the response of wind turbines to different classes of voltages sags. Models of all the wind turbine parts are described and integrated in two different platforms. Mechanical and aerdynamics are modeled using GH Bladedcopy while electrical and control parts are modeled using Matlab...
The design of a pitch control capable to respond to frequency deviations is presented in this paper. The pitch control method reserves a percentage of power extracted from the wind turbine in order to help to mitigate frequency deviations when an extra power is needed. For the purpose of pitch control design, the transfer function of the whole system and an adjust of a controller is needed. Results...
This paper deals with the control of doubly fed induction generators to ride through unbalanced voltage sags. A control strategy is proposed by choosing certain current reference values in the positive and negative sequences so that the torque and the DC voltage are kept stable during such unbalanced sags. Both rotor- and grid-side converters are considered, detailing the control scheme of each converter...
Wind turbine electrical generation systems (WTGSs) with doubly-fed induction generators and variable speed capabilities have become popular because of its wide operation range and quality power output compared to the old fixed-speed squirrel-cage generators. The growing WTGS implantation have also increased the grid incidenses due to the wind parks and thus the study of the design of the control to...
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