This paper analyzes the frequency characteristics of the inverter based on the mixed-domain control for stability by the impedance method. Considering frequency coupling effects by the PLL control, it is found that the passivity of the inverter is violated and it may become unstable for a weak grid.
It is known that the frequency transfer function of the PLL may affect mutual interactions between grid and line impedances. This paper analyzes the frequency characteristics of the inverter based on the mixed-domain control for stability by the impedance method.
Learn more. This paper analyzes the stability of a grid-following inverter by the complex vector control in αβ domain and by the PLL synchronization control in dq domain. It is known that the frequency transfer function of the PLL may affect mutual interactions between grid and line impedances.
In the literature mentioned above, the impact of the FCE on impedance models is considered when establishing the inverter output impedance model. However, the factors causing the FCE are not considered comprehensively enough to effectively suppress the impact of frequency coupling.
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It is known that the frequency transfer function of the PLL may affect mutual interactions between grid and line impedances. This paper analyzes the frequency characteristics of the inverter …
Grid-tied inverters, used in renewable energy sources, are exposed to distortions emitted by various sources including the reference signal, external power grid, and DC-link …
The Grid-forming converters'' stability is examined to address the issue of the risk of instability of Grid-forming converters under a strong grid. To improve the grid-connected …
Grid-forming (GFM) inverters play a critical role in stabilizing future power grids. However, their synchronization is inherently coupled with frequency support, which poses a …
In a grid-connected PV system, the inverter controls the grid injected current to set the dc link voltage to its reference value and to adjust the active and reactive power delivered …
In grid-connected inverter (GCI), the asymmetrical control structures lead to frequency coupling effect, complicating system analysis and threatening grid stability. To suppress frequency …
An inverter may be compelled to operate in a current-limiting mode that modifies inverter dynamics during grid emergencies like faults, voltage decreases, or frequency and …
The Grid-connected inverter (GCI) often operates in the weak grid with asymmetrical grid impedance due to the unbalanced and single-phase loads. Howev…
This inertia traditionally helps maintain grid frequency during sudden changes in power demand or supply. This work investigates the impact of RES on grid stability and explores methods for …
This Grid Current Feedback Active Damping (GCF-AD) strategies based on high-pass filter HPF -either first order (FO) or second order (SO)- are widely used to suppress …
Because the grid synchronization link will affect the characteristics of the system at low frequency. Specifically, the low-frequency output impedance of the grid-connected inverter …
Article Open access Published: 14 December 2025 Grid resilience enhancement of photovoltaic systems via Lyapunov-validated active–reactive power coordination and inverter …
Secondly, a secondary frequency and voltage regulation strategy to improve VSG control is proposed to restore the frequency and voltage of the VSG, and the SOGI phase …
The level of current harmonics circulating in a transformer winding can affect its operating temperature and lifetime. Although the existing standards mainly consider the impact …
Additionally, this paper assumes that the switching frequency of the grid-connected inverter is significantly higher than the grid frequency. Consequently, during the system …
Under a high proportion, the asymmetry of the control structure or parameters in the three-phase grid-connected inverter controller lead to a strong coupling relationship …
It is known that the frequency transfer function of the PLL may affect mutual interactions between grid and line impedances. This paper analyzes the …
Droop-Based GFMI: Mimics the droop characteristics of synchronous generators by adjusting frequency and voltage in response to active and reactive power imbalances. This …
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