Co-Simulation Domain Decomposition Algorithm for Hybrid EMT-Dynamic Phasor Modeling

An iterative coupling algorithm based on a restricted additive Schwarz domain decomposition is investigated to co-simulate electrical circuits with hybrid electromagnetic (EMT) and transient stability (TS) modeled using dynamic phasors. This co-simulation algorithm does not introduce any delay between the data exchanged at the co-simulation step. The pure linear convergence property of the iterative method allows it to be accelerated towards the true solution by a non-intrusive Aitken’s acceleration of the convergence post-processing, even if the domain decomposition interface conditions make the iterative method divergent. This provides a method less sensitive to the splitting. This algorithm can then be implemented in a distributed master-slaves architecture. An example on a linear RLC circuit combining EMT and TS modeling, and a partitioning with overlap is given.