Enhanced average model for current source converter hybrid simulations

Accurate computational simulations are highly required to properly assess the performance of power grids under high penetration levels of non-conventional generation which connects to the grid via static power converters. However, software packages that are typically used to perform power system analysis may not necessarily have the capacity to efficiently perform detailed simulations of power grids that contain, for example, hundreds of PWM converters, specially when the computational resource is limited or real-time simulation is needed. In view of this problem, this paper proposes a new modeling and simulation technique that makes use of the average of the PWM waveforms rather than their instantaneous values to simulate the converter. Two softwares packages are used to validate the proposed solution, PSIM is used to validate the proposed converter model and DigSILENT to validate the use of this model in a power system simulation tool. Results show that the proposed solution allows increasing the simulation time-step of models containing PWM converters in up to 50 times, while keeping a high level of accuracy in representing the grid related waveforms.