Optimizing Grid-Connected Converters for Stability
Table of Contents
GFL and GFM inverters play pivotal roles in controlling real and reactive power within grid systems. Understanding their dynamics is crucial for ensuring stability and efficiency.
Differential Control Mechanisms:
GFL inverters utilize current injection with phase-locked loops (PLL) for grid phase angle tracking, while GFM inverters act as controllable voltage sources behind coupling reactance, akin to grid-tied synchronous generators. Voltage source inverters with droop characteristics enable direct voltage and frequency control.
Impact of Grid Impedance:
High grid impedance can disrupt inverter current control loops, leading to sustained harmonic resonance or instability issues. The graph below illustrates how grid impedance affects stability, emphasizing the importance of mitigating these effects.
Assessing Stability:
In the paper referenced bellow titled “Impedance-Based Stability Criterion for Grid-Connected Inverters”, the authors highlight the significance of examining the ratio of grid impedance to inverter output impedance. Meeting the Nyquist stability criterion is essential for maintaining stability in interconnected source-load systems.
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Enhanced Testing Capabilities:
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