AUTHOR=Tang Yuan , Yang Conghuan , Yan Zuanhong , Xue Ying , He Yi 

TITLE=Coordinated Control of a Wind Turbine and Battery Storage System in Providing Fast-Frequency Regulation and Extending the Cycle Life of Battery 

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.927453

DOI=10.3389/fenrg.2022.927453

ISSN=2296-598X

ABSTRACT=Fast Frequency Regulation (FFR) is becoming a key measure to enhance the frequency stability of power system as the penetration of renewables and power electronics continues to grow and the system inertia declines. Despite that different control methods have been proposed to provide wind turbine generator (WTG) with limited capability of virtual inertia and frequency support, coordination of WTG and battery energy storage system (BESS) and the potential optimization benefits have not been fully studied. This paper proposes a coordinated control of WTG and BESS that provides FFR to the AC system and at the same time extends the cycle life of battery. First, a cost-effective and SOC-based FFR strategy of BESS alone is proposed. Based on that, a coordinated FFR method for the WTG-BESS hybrid system under all wind speeds is proposed by analyzing the operational characteristics of WTG. The proposed coordinated strategy improves the FFR performance with longer cycle life and lower cost of battery under different operating conditions. Simulation results based on varying wind speeds show that the proposed FFR strategy raises the frequency nadir and avoids frequency secondary dip (FSD).