Article,
Dynamic Coupling Mechanism Analysis Between Voltage and Frequency in Virtual Synchronous Generator System
Contributors
Cheng H.
0000-0001-8042-3422
[1]
Li C.
0000-0001-8837-0855
(Corresponding author)
[2]
Ghias A.M.Y.M.
0000-0001-7914-1209
[3]
Blaabjerg F.
0000-0003-0223-4081
[4]
Affiliations
- [1] Changsha University of Science and Technology [NORA names: China; Asia, East];
- [2] Hefei University of Technology [NORA names: China; Asia, East];
- [3] Nanyang Technological University [NORA names: Singapore; Asia, South];
- [4] Aalborg University [NORA names: AAU Aalborg University; University; Denmark; Europe, EU; Nordic; OECD]
Abstract
This letter investigates the dynamic coupling mechanism between voltage and frequency in a virtual synchronous generator (VSG) system, where a unified model is proposed for the analysis of voltage stability, frequency stability and voltage-frequency coupled stability. The results show that voltage/frequency stability is impacted by both self- and coupled-dynamics. Moreover, voltage and frequency oscillate at the same oscillation frequency if the voltage-frequency coupled instability occurs. However, the frequency oscillation occurs while voltage magnitude maintains stability if voltage self-dynamics behaves a negative feedback effect. The time-domain simulation is performed to validate the rationality of the theoretical analysis.
