Methodology of transient simulation in time domain for DG and microgrid(1): Basic framework and algorithm

DG(Distributed Generation) and microgrid are featured with nonlinearity and randomness and the transient simulation of their response characteristics in time domain requires detailed modeling of the elements, for which, the framework of electromagnetic transient simulation based on nodal analysis is adopted. Different algorithms of transient simulation are introduced and compared. The modified augmented nodal analysis is applied to extend the modeling capability of electrical system, the Newton iteration is applied to obtain the solution of control system and eliminate the inner time-delay of nonlinear elements, the pseudo Newton method is applied to enhance the calculation speed of control system, and the interpolation scheme is applied in the simulation of power electronic switching. The initialization methods for the transient simulation are discussed.