Research on static voltage stability enhancement for new energy station based on grid-forming control strategy

• Published in: Frontiers in energy research Vol. 12
• Main Authors: Wentao, Sun, Guojing, Liu, Yi, Ge, Quanquan, Wang, Hui, Cai, Xingning, Han, Wenjia, Zhang
• Format: Journal Article
• Language: English
• Published: Frontiers Media S.A 08-11-2024
• Subjects: converter impedance characteristics; grid-forming control; high penetration of new energy; new power systems; static voltage stability
• ISSN: 2296-598X; 2296-598X
• DOI: 10.3389/fenrg.2024.1463229

The advent of novel power systems has given rise to a multitude of safety and stability concerns associated with the integration of emerging energy sources and power electronic equipment. The active support of the grid-forming control strategy represents an effective solution to the voltage and frequency stability issues associated with the weak damping and low inertia inherent to high-ratio new energy systems. Firstly, a static voltage stability index based on critical impedance is proposed for assessment of the static stability margin of a new energy grid-connected system, based on the static voltage stability theory of a traditional single-unit single-load system. Secondly, an analysis is conducted of the control principle of the grid-forming control converter and its impedance characteristics. In conclusion, a method for enhancing the static voltage stability margin of grid-connected new energy stations through parameter control of grid-forming converters is presented. The simulation verification of the single-feed and multi-feed systems demonstrates the efficacy and accuracy of the methodology presented in this study.