Variable Time-Stepping Parallel Electromagnetic Transient Simulation of Hybrid AC–DC Grids

The complicated hybrid ac-dc network architecture creates new challenge for electromagnetic transient (EMT) simulation of large-scale systems in terms accuracy and efficiency. By utilizing the variable time-stepping (VTS) method graphics processing unit (GPU) parallelism, this article proposes a four-level dynamic parallelism EMT grids. applying proposed hierarchical system decomposition VTS scheme, multiple time-step areas (TSAs) that contain subsystems with same size adaptation criteria can be computed different GPU blocks parallel. Taking advantage feature GPUs, is to fully exploit possibility parallelizing simulation, though which within each TSA detailed equipment models subsystem run also parallel via elaborate configurations. waveforms execution time speed-ups indicate extremely accelerate process while guaranteeing reasonable compared fixed based simulation.