Modeling and Small-Signal Stability Analysis of Virtual Synchronous Generator Control With Dynamics of Field Winding Electromagnetic Transient and E - ω Coupling

Based on different synchronous generator (SG) models, the existing virtual synchronous generator (VSG) controls can be implemented with/without the field winding electromagnetic transient and/orE–ωcoupling dynamics. However, it remains unclear which implementation provides the best small-signal stability. This paper performs thorough analyses on the small-signal stability impacts of integrating the dynamics of field winding electromagnetic transient andE-ωcoupling in the basic VSG control. It is revealed that a coupling between theq-axis current and the reactive power control (RPC) output voltage is introduced by incorporating the field winding electromagnetic transient dynamics, which creates a potential right-half-plane (RHP) pole and jeopardizes system stability. In contrast, the inclusion of theE-ωcoupling dynamics introduces a phase-leading component, thereby improving system stability. Based on these findings, recommendations are provided to inform the design of advanced VSG control. The theoretical analyses are validated through experimental tests.