Adaptive Estimation of Grid Voltage Parameters with Zero Steady State Error: A Dynamic System Perspective

Articles

Adaptive Estimation of Grid Voltage Parameters with Zero Steady State Error: A Dynamic System Perspective [APPEEC 2016]
Author(s)
Wei Lin
ABSTRACT
This plenary lecture presents a unified framework for estimation of single- or three-phase voltage parameters under grid unbalanced faults and harmonic disturbances. By treating the grid voltage as a dynamic system with unknown parameters related to the system fundamental and harmonic frequencies, we develop parameterized dynamic models and an adaptive observer-based approach to estimate single- and/or three-phase grid voltage parameters such as frequencies, amplitudes and phase angles with zero steady state error. The contributions of the talk can be summarized as follows: 1) when the grid involves only fundamental voltage, a third-order adaptive estimator is derived by observer design combined with the notion of passivity. It is shown that the third-order adaptive observer can estimate the grid voltage parameters without steady state error; 2) when the grid voltage involves harmonic disturbances, a higher-order adaptive observer is designed to estimate the grid voltage parameters. Passivity and Lyapunov-based arguments ensure that the proposed method also achieves zero steady state estimation error. Both numerical simulations and dSPACE-based experiments are conducted to validate the effectiveness of our estimation strategies.
KEYWORDS
Grid Voltage Parameters, Zero Steady State Error
References