Abstract
In this article, a technique for the reduction of total harmonic distortion (THD) in distributed renewables energy access (DREA) composed of wind turbines is introduced and tested under the wind speed conditions presented in Tamaulipas, Mexico. The analysis and simulation are delimited by a study case based on wind speeds measured and recorded for one year at two highs in the municipality of Soto La Marina, Tamaulipas, Mexico. From this information, the most probable wind speed and the corresponding turbulence intensity is calculated and applied to a wind energy conversion system (WECS). The WECS is composed of an active front-end (AFE) converter topology using four voltage source converters (VSCs) connected in parallel with a different phase shift angle at the digital sinusoidal pulse width modulation (DSPWM) signals of each VSC. The WECS is formed by the connection of five type-4 wind turbines (WTs). The effectiveness and robustness of the DREA integration are reviewed in the light of a complete mathematical model and corroborated by the simulation results in Matlab-Simulink®. The results evidence a reduction of the THD in grid currents up to four times and which enables the delivery of a power capacity of 10 MVA in the Tamaulipas AC distribution grid that complies with grid code of harmonic distortion production.
Highlights
Around the world, wind energy conversion systems (WECS) are a competitive alternative to fossil fuels to generate electricity without the production of greenhouse emissions
The active front-end (AFE) converter is modeled by the connection of two voltage source converters (VSCs), where one VSC is called the machine side converters (MSCs), through which the transferred current compensation is made by induction from the rotor to the stator, and the Permanent Magnet Synchronous Generators (PMSGs) angular frequency regulation is carried out; while the other VSC is named the grid-side converter (GSC), wherein the feedback current control is performed at the AC grid and the DC-link voltage constant is maintained [17]
Switching signals, which corresponds to 8.426%. This happens because the generated harmonics between the VSC and wind turbines (WTs)-PMSG are not constant; they vary according to the switching frequency and the proposed control law applied to the AFE converter
Summary
Wind energy conversion systems (WECS) are a competitive alternative to fossil fuels to generate electricity without the production of greenhouse emissions. Within this panorama, the investigations of the interaction between the electrical grid and the wind turbine (WT) installation is an important research topic since it is necessary to prevent energy loss due to disturbances in the WECS, including the reduction of power quality because of the presence of harmonic currents. In the presence of current asymmetric faults, are the reduces/increases the generator current, keeping the DC-link voltage constant while the GSC varies the AC grid current, performing power compensation. The DREA simulation in Matlab-Simulink underand typical wind speed conditions for analysis, design, and modeling, producing aMexico total transferred power capacity of 10. Thisand paper is organized follows: Section 2 delimits the machine-side region in Mexico selected to assess the modeling, design of the as integration, where the VSC modeling, DC-link effectiveness the controller typical winds speed conditions.
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