Title :
A robust back-stepping stabilization scheme for virtual synchronous generators in weak grids
Author :
Pourroshanfekr, Hamoun ; Rokrok, Esmaeil ; Javidsharifi, Mahshid
Author_Institution :
Electr. & Electron. Eng. Dept., Lorestan Univ., Khorramabad, Iran
Abstract :
This paper presents a new control scheme for virtual synchronous generators connected to weak grids. The proposed approach consists of two major parts. The first part holds a cooperative linear and nonlinear controller in order to emulate the synchronous generator behavior such that by preparing virtual inertia, power and frequency oscillations get damped. The second part deals with a control scheme for voltage and current inner loops. Both control schemes are based on the back-stepping method, while in the latter sliding mode controllers in the dq reference frame are also used. The controller system design is such that in addition to tracking reference commands, it is robust to system model uncertainties and disturbances. In the process of controller design the system stability is also considered. The desired performance of the proposed control scheme for a virtual synchronous generator connected to weak grids in the presence of disturbances and uncertainties in model parameters is demonstrated through simulation results.
Keywords :
machine control; nonlinear control systems; power generation faults; power grids; power system stability; synchronous generators; variable structure systems; back-stepping method; cooperative nonlinear controller; dq reference frame; frequency oscillations; model disturbance; model uncertainty; power oscillations; reference commands; robust back-stepping stabilization scheme; sliding mode controllers; system stability; virtual inertia; virtual synchronous generators; weak grids; Asymptotic stability; Silicon; Simulation; Stability analysis; back-stepping method; sliding mode controller; virtual synchronous generator; weak grids;
Conference_Titel :
Power Electronics, Drives Systems & Technologies Conference (PEDSTC), 2015 6th
Conference_Location :
Tehran
Print_ISBN :
978-1-4799-7652-2
DOI :
10.1109/PEDSTC.2015.7093327