Finite-Time Nonlinear Observer Design for Uncertain DC Microgrids Feeding Constant Power Loads
- Resource Type
- Conference
- Authors
- Neisarian, Shekoufeh; Arefi, Mohammad Mehdi; Vafamand, Navid; Javadi, Mohammad S.; Joao Catalao, P. S.
- Source
- 2021 IEEE International Conference on Environment and Electrical Engineering and 2021 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) Environment and Electrical Engineering and 2021 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe), 2021 IEEE International Conference on. :1-5 Sep, 2021
- Subject
- Components, Circuits, Devices and Systems
Engineering Profession
Fields, Waves and Electromagnetics
Power, Energy and Industry Applications
Robotics and Control Systems
Transportation
Inductance
Renewable energy sources
Power system dynamics
Microgrids
Observers
Power system stability
Stability analysis
Uncertain DC microgrid
Buck converter
Constant power load
Nonlinear observer
Adjustable finite convergence time
- Language
Due to the salient features of direct current (DC) microgrids (MGs) in integrating renewable energy sources, this paper offers a robust finite-time nonlinear observer (FTNO) for DC MGs comprising linear resistive and nonlinear constant power loads (CPLs) and a buck converter. It is assumed that the capacitor voltage is only accessible and the power system is subject to unknown time-varying uncertainties. A novel nonlinear observer is designed to estimate the inductance curren2t to prevent the ripples produced by current sensors and to eliminate the price of utilizing expensive sensors. The global finite-time stability analysis of the observer error dynamic is investigated via a Lyapunov function and an explicit finite convergence time (FCT) is derived. The convergence rate of the estimated current is tunable by adjusting the parameters in FCT. Eventually, simulations are carried out to confirm the superiority of the proposed observer performance in estimating unknown inductance current in a particular finite time.