An R-FCL/BESS scheme to smooth active power fluctuation and enhance Fault Ride-Through capacity of DFIG-based Wind turbines

• Grant number: 19/03621-2
• Support type: Scholarships abroad - Research Internship - Master's degree
• Effective date (Start): July 01, 2019
• Effective date (End): November 20, 2019
• Field of knowledge: Engineering - Electrical Engineering - Power Systems
• Principal researcher: Eduardo Nobuhiro Asada
• Grantee: Fernando Ribeiro Arduini
• Supervisor abroad: Oriol Gomis Bellmunt
• Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Research place: Universitat Politècnica de Catalunya (UPC), Spain
• Associated to the scholarship: 18/08059-8 - Strategies for improvement of fault ride-through capability of DFIG wind generators, BP.MS

Abstract

The deployment of renewable generation technologies is contributing to the diversification of the world energy matrix and the reduction of greenhouse gas emissions. Wind powergeneration has been growing worldwide and mainly in Brazil. In the current scenario, in the occurrence of a disturbance near the point of common coupling between the wind power plant and the electrical network, the wind turbines are required to remain in operation and contribute to the control and stability of the electrical grid. This requisite is known as Fault Ride-Through (FRT). Doubly fed induction generator (DFIG) represents the most popular wind power topology due to its ability to extract maximum power fromthe wind, control flexibility offered by the generator and usage of reduced size powerelectronic converters. However, DFIG is highly sensitive to grid disturbances due to its constructive aspects. In the occurrence of a fault near the point of common coupling, the wind plant undergoes an increase in rotor current levels. Also, the DC link voltage levels of the CA/CC/CA converter reach high magnitudes due to the unbalance of power during the voltage sag. These conditions can damage the rotor side converter (RSC) and the DC link capacitor, implying that the wind power plant is shut down by the protectionsystem before any damage can occur. Therefore, this project aims to complement the student's research project by implementing a strategy to limit the DFIG-Battery rotor current to safety limits. For this purpose, a resistive type fault current limiter (R-FCL) will be applied in the proposed system to assist the battery in improving the wind power plant FRT capacity. The steps of the project aim at a bibliographic review about FCL and wind power integration, design and implementation of an R-FCL to be connected to the proposed distributed DFIG-Battery system, and evaluation of the results. (AU)