Decentralized Linear Swing Dynamics in a Multi-machine System with Inverters

The high penetration of power-electronics-driven power generation and the transition towards low-inertia power systems is affecting the fundamentals of grid operation. The loss of Synchronous Generators (SGs) together with their mechanical inertia and their frequency control mechanisms brings new challenges to power system stability. Numerous decentralized control schemes for virtual inertia provision by emulation of SGs are presented in literature. However, the SG emulation has the drawback of nonlinear swing dynamics. As an alternative, the Linear Swing Dynamics (LSD) concept was proposed to exploit the smartness of power-electronic converters to not only secure the operation of future power systems but also enhance their dynamic behavior. In this work, we propose a feasible decentralized LSD control scheme for multi-machine power system with CPLs. The proposed control scheme is integrated into the state-of-the-art VSM controller and verified through simulations in MATLAB Simulink.