AUTHOR=Xi Xinze , Shi Zhenghao , Wang Xian , Xing Chao , Li Shengnan 

TITLE=Adaptive finite-time parameter estimation for grid-connected converter with LCL filter

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.964216

DOI=10.3389/fenrg.2022.964216

ISSN=2296-598X

ABSTRACT=This paper proposes an online finite-time adaptive parameter estimation method for a grid-connected voltage source inverter (VSI) with LCL filter. In this framework, a time-continuous
state-space system model is first developed, which is different from nonparametric frequency-response based method. Then, the parameter estimation error information is extracted by
introducing a series of filter operations. Moreover, a sliding mode term is studied and cooperated
with the obtained parameter estimation error to design the parameter estimation error-based
finite-time adaptive parameter estimation algorithm. With the help of this novel adaptive law,
the physical parameters of electrical components can be driven to their true values accurately
and fast. Theoretical analysis is conducted in terms of the Lyapunov theory to demonstrate the
convergence of the parameter estimation error. Finally, numerical simulation results are provided
to illustrate superiority of the proposed method over conventional method.