A New Virtual Inductance Control Method for Frequency Stabilization of Grid-Forming Virtual Synchronous Generators

Abstract

Frequency stabilization is the premise of guaranteeing grid-friendly integration of virtual synchronous generator (VSG). Based on that premise, this study, focused on frequency stability, establishes the small signal model of grid-forming VSG system. At first, the mechanism of frequency oscillation occurring in system of active-and reactive-power coupling is analyzed by the defined feedback effect factor (FEF) in this study. Besides, a new dynamic model is established for identifying dynamic interaction of voltage magnitudes and frequency by means of feedback effect. The analytical results of established models agree with that of eigenvalue analysis. Furthermore, a new virtual inductance control strategy is proposed to mitigate the unstable oscillation of frequency and powers, enhance damping performance, and improve stability margins. Unlike the conventional virtual inductance control, which is reliable on dual-loop control framework, the proposed virtual inductance control in this study is based on principle of energy conservation and can be applicable for the grid-forming inverter without inner dual-loop control structure. Finally, the proposed modeling as well as virtual inductance control method is experimentally verified.

Fractional-Order Virtual Synchronous Generator

“…With respect to the digital realization, the Tustin discretization method is applied in this paper for both VSG and [14]. Using (2), ( 3), (7), the can be automatically realized in Matlab, and the resulting regulators are 2nd and 11th order (N×2 + 1), respectively. The computational burden in both cases is negligible for digital processors.…”

“…Additional damping effects were realized in [6] by adding extra feedback of the angular frequency or its derivative term. The virtual impedance concept was adopted in [7] for damping purposes as well. Moreover, on the basis of the state feedback control, the activedamping strategy with a full state feedback was studied in [8].…”

Power stability control of wind-PV-battery AC microgrid based on two-parameters fuzzy VSG

“…It achieves this by regulating frequency and voltage of the grid through control of active and Frontiers in Energy Research frontiersin.org reactive power, resulting in better control accuracy and effectiveness. This form of decoupled control is achieved through improved inertia (Yu and Hu, 2019;Yang et al, 2023). The essence of VSG control is to simulate the operating characteristics of the synchronous generator.…”

Grid-Forming Control: Advancements towards 100% Inverter-Based Grids—A Review

“…The steady-state, transient, and synchronisation stability characteristics of the VSG are of interest, given that it is an attractive GFM control through which to combat the issue of reduced inertia in grids [82], with areas such as damping [83], resonance and oscillations in weak grids [84], virtual resistance [85], system representation [86,87], decoupling for oscillation mitigation [88], and the effects of grid conditions [89] being investigated extensively.…”