Assessment of Interactions of Multiple Converters and Network Considering Impedance Change

This paper addresses the stability challenges arising from the integration of multiple converters into an AC network, spotlighting on potential instabilities generated by the interplay between converter control loops and the network's passive components. Employing an impedance-based approach that incorporates impedance ratio (IR) and examining a different control configuration such as active and reactive Power (PQ) and active Power and AC voltage (PV), alongside other parameters like phase-Locked loop (PLL), this work examines methodically the dynamic interactions. Through IR, it evaluates the individual impacts of converter (remote converter) on network equivalents, thereby elucidating how the interaction between converters and the broader network influences overall system stability. Ultimately, the proposed methodology aids in identifying impedance variations and potential instabilities in grid-tied converters, offering a roadmap for the perceptive design of converters and network parameter configurations.