Work

Negative Sequence Cancellation in DFIGs via Independently Controlled Dynamic Braking Resistors

Year: 2025

Type: conference-paper

Abstract: This paper extends the concept of using dynamic braking resistors (DBRs) in series with the stator of doubly-fed induction generators (DFIGs) to improve low-voltage ride-through (LVRT) performance, specifically under asymmetrical grid faults. Although previous studies have demonstrated the effectiveness of fixed or discrete-valued DBRs in mitigating electrical transients, mechanical issues such as torque loss remain mostly underexplored. In this work, we leverage independent control of the resistance in each stator phase by means of pulse-width modulation to maintain generator torque and cancel the negative sequence component of the grid voltage. By shaping the DBR voltage drop through asymmetric resistances, the resulting negative sequence voltage opposes that of the grid, reducing torque oscillations and enabling more stable DFIG operation during unbalanced faults. Analytical derivations and simulation results validate the proposed control strategy.

Source: Proceedings of the Annual Conference of the IEEE Industrial Electronics Society

DOI: 10.1109/iecon58223.2025.11221983

Authors: Filip Baum, Jesus Lopez, Javier Samanes, Jan Bauer

Institutions: Czech Technical University in Prague, Universidad Pública de Navarra (UPNA)

Language: English

Topic: Wind Turbine Control Systems

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Industry, innovation and infrastructure

Open Access status: green

Funders: České Vysoké Učení Technické v Praze, European Commission, European Regional Development Fund, Agencia Estatal de Investigación