Work

Enhanced grid-following BESS control strategy for unbalanced voltage sag conditions

Year: 2025

Type: article

Abstract: Battery energy storage systems (BESS) play a pivotal role in modern power systems, with most implementations found in distribution networks that operate using a grid-following (GFL) approach. However, these networks often experience voltage unbalances that can negatively impact BESS operation. Under such conditions, conventional dq control may lead to high grid current unbalance, high harmonic distortion, and DC voltage fluctuations. To overcome these challenges, this paper proposes a control scheme for a grid-following BESS using a dual active bridge (DAB) and a three-phase voltage source converter (VSC) to ensure stable operation under grid unbalances. The DAB manages battery charging, while the VSC regulates the DC voltage. By generating independent modulating signals, the BESS maintains balanced, distortion-free grid currents. Real-time simulations and power hardware-in-the-loop (P-HIL) experiments validate the proposed scheme's performance under unbalanced conditions. The results demonstrate effective operation under various unbalanced conditions in both charging and discharging modes, ensuring power flow continuity and extending the storage component's operational life.

Source: Journal of Energy Storage

DOI: 10.1016/j.est.2025.118252

Authors: Alfredo Velázquez Ibáñez, Juan R. Rodríguez Rodríguez, Felix R. Segundo Sevilla, Artjoms Obushevs, Petr Korba

Institution: ZHAW Zurich University of Applied Sciences

Language: English

Topic: Microgrid Control and Optimization

Subfield: Control and Systems Engineering

Field: Engineering

Domain: Physical Sciences

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

Open Access status: hybrid

Estimated APC paid: $3,560