Paper Info
Title
Robust Estimation Of Grid Voltage Parameters Via A Second-Order Sliding Mode Observer
Abstract
Grid voltage parameters, including the amplitude, frequency and phase angle of the grid voltage, are essential for real-time control and protection in power systems. Current approaches mainly focus on adopting a phase-locked loop or its derivatives for parameters estimation. However, they could hardly achieve fast response and are sensitive to voltage variations and disturbances. In this paper, the estimation of grid voltage parameters is recast as an observer design problem. An exosystem model of the sinusoidal voltage is established at first. Then, a framework for the observer-based methods is proposed for the robust estimation of single-phase grid voltage parameters. Moreover, a second-order sliding mode observer (SMO), which actually has the lowest order among all possible observers, is designed to estimate the parameters. Based on the Lyapunov theory, the asymptotic stability of the closed-loop SMO is proved. Compared with two other typical methods, simulations are carried out to illustrate the effectiveness and robustness of the proposed approach in the presence of voltage variations and external disturbances. In addition, the proposed estimation approach may also be valuable for online fault detection of voltage sag and low-frequency oscillation.
Year
Venue
Keywords
2018
2018 ANNUAL AMERICAN CONTROL CONFERENCE (ACC)
voltage parameters, exosystem model, sliding mode observer, robust estimation, low-frequency oscillation, phase-locked loops (PLL)
Field
DocType
ISSN
Lyapunov function,Fault detection and isolation,Control theory,Computer science,Voltage,Electric power system,Robustness (computer science),Exponential stability,Observer (quantum physics),Voltage sag
Conference
0743-1619
Citations 
PageRank 
References 
0
0.34
0
Authors
4
Name
Order
Citations
PageRank
Zhen Tian100.34
Qing-Chang Zhong241754.97
Zijun Lyu300.68
Jingqi Yuan400.34