Dr Sheshadri Shekhar Rauth, Assistant Professor, Department of Electrical and Electronics Engineering, has developed a control method that enables wind turbines to remain connected during grid faults and actively support voltage recovery. In his paper “An LVRT strategy for DFIG-BESS based WECS with maximum voltage support”, he elaborated how by coordinating the wind generator with a battery system, it delivers timely electrical support, improving grid stability and resilience. His paper was published in the Q1 journal IEEE Transactions on Sustainable Energy,” having an impact factor 10.

Abstract

This paper proposes an advanced low-voltage ride-through (LVRT) strategy for a grid-connected doubly-fed induction generator (DFIG) based wind energy conversion system integrated with a battery energy storage system (BESS). The method ensures maximum AC bus voltage recovery during grid faults by optimally coordinating rotor-side and grid-side converters. A modified adaptive control scheme dynamically adjusts current injection based on network conditions, enabling full utilization of converter capacity. The test results demonstrate significant improvement in voltage recovery and transient stability compared to existing approaches.

Explanation of your research in layperson’s terms:

When there is a fault in the power grid, the voltage drops suddenly. Normally, wind turbines may disconnect during such events, which can worsen the situation. In this research, we developed a method that allows wind turbines not only to stay connected during these disturbances but also to actively help the grid recover faster. By intelligently coordinating the wind generator and a battery system, the system injects the right amount of electrical support at the right time, improving overall power system stability.

Practical implementation/ Social implications of your research

 Enhances grid stability during faults in renewable-rich power systems –

• Helps wind power plants comply with modern grid codes (LVRT requirements)
• Supports reliable integration of renewable energy into the grid
• Improves performance of microgrids and smart grids
• Contributes to a cleaner and more resilient energy infrastructure

This work is especially relevant as power systems move toward higher penetration of renewable energy sources.

Collaborations

This research is a collaborative effort between:

• Department of Electrical and Electronics Engineering, SRM University AP
• Department of Electrical Engineering, IIT Kharagpur
• Department of Sustainable Energy Engineering, IIT Kanpur

Future research plans

• Extension to multi renewable energy systems with coordinated current injection
• Integration with grid-forming converters for improved operation in weak grids
• Development of data-driven methods for real-time estimation of network X/R ratio
• Extension to unbalanced fault conditions using symmetrical component and dq-sequence control to mitigate negative-sequence currents and voltage imbalance
• Thermal and reliability analysis of converters under repeated LVRT events