Virtual Oscillator Control of Equivalent Voltage-Sourced and Current-Controlled Power Converters

Energies

DanielF. Opila¹  Spencer Shabshab¹  Stephen Phillips¹  Keith Kintzley¹ 

[1] Department of Electrical and Computer Engineering, United States Naval Academy, Annapolis, MD 21402, USA;

关键词: coupled oscillators;    virtual impedance;    synchronization;    power converters;    droop control;    virtual admittance;    distributed generation;    energy;    renewable energy;    microgrids;   

DOI  :  10.3390/en12020298

来源: DOAJ

【 摘 要 】

The dynamics of a general class of weakly nonlinear oscillators can be used to control power converters to create a self-forming AC network of distributed generators. Many control stability results for these “virtual” oscillators consider the interaction of voltage-source converters, but most practical converters use a nested current loop. This paper develops a general method to extend voltage-source stability results to current-controlled converters using a virtual admittance. A fast current control loop allows a singular perturbations analysis to demonstrate the equivalence of the two. This virtual admittance can also manipulate load sharing between converters without changing the core nonlinear dynamics. In addition, Virtual Oscillator Control is experimentally demonstrated with three-phase voltage-sourced and current-controlled inverters. This validates the equivalence of the two formulations, and extends previous single phase testing into three phases. The extension to current-controlled converters enhances safety and increases the breadth of applications for existing control methods.

【 授权许可】

Unknown