A grid-forming control method based on negative imaginary theory for distributed energy resource

Abstract

Due to the increases of renewable energy penetration and share of power electronic devices in the power system, Grid-forming (GFM) control methods have become one of the most important technology for the power systems with a high proportion of new energy resources. To improve the control performance of the VSC (Voltage Source Converter), a novel GFM control method based on negative imaginary theory is proposed in this paper. Firstly, the typical structure of distributed energy system is analyzed. Then, the negative imaginary characteristic of VSC’s mathematical model is proved and a negative imaginary controller (NIC) is designed. Finally, the effectiveness and feasibility of the proposed control method are verified by simulation results through MATLAB/Simulink.

Keywords

• Negative imaginary theory
• Grid-forming control
• VSC
• Distributed energy resources
• Droop control