Abstract
This work aims to analyze and validate through mathematical modeling and experimental results, in a three-phase three-wire electrical system, the technical viability of a static power converter with a two-level topology with only two controlled branches (2L2B), operating as a grid-side converter (GSC) in a wind turbine generator based on a doubly fed induction generator (DFIG). With this reduced-switches topology, the GSC is able to regulate the DC-link voltage level from the generator back-to-back converter and provide ancillary services of harmonic filtering and reactive power compensation from linear/nonlinear loads connected to the point of common coupling. An 8-kVA experimental prototype was implemented in the laboratory to validate the proposal. The prototype control system was realized using the dSPACE DS1103 PPC Controller Board platform programmed via MATLAB/Simulink. The effectiveness of the proposed system is verified by comparing the results obtained with the 2L2B topology to the ones with the usual two-level three-branch topology.
Highlights
In 2017, about 82% of the installed capacity of the world’s wind power generation was due to the doubly fed induction generator (DFIG), or Type III turbines; Figure 1 [1,2]
This work presents a study on the operational feasibility of a grid-side converter (GSC) with reduced number of switches for DFIG-based wind turbine generators (WTG)
The effectiveness of the 2L2B topology is assessed in a scenario where ancillary services, namely harmonics filtering and reactive power compensation, are provided, while regulating the DC-link voltage
Summary
In 2017, about 82% of the installed capacity of the world’s wind power generation was due to the doubly fed induction generator (DFIG), or Type III turbines; Figure 1 [1,2] This record has highlighted the importance of the role which static power converters play in distributed energy resources (DER) [3]. Controls the DFIG stator power, while the grid-side converter (GSC) regulates the voltage at the DC link, and performs the reactive power compensation [4,5] They are widely present in today’s wind power generation market, Type III WTG still have a vast range of problems and solutions that attract continuous efforts from researchers aiming to improve their performance as DERs and reduce operation and maintenance costs [5,6,7,8,9,10,11,12,13,14,15,16]
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