The invention discloses a method for
islanding microgrid control and optimization based on rotating coordinate
virtual impedance. Aiming to a fact that the actual microgrids have complicated impedance characteristics, the method for
islanding microgrid control and optimization based on the rotating coordinate
virtual impedance includes utilizing the coordinate rotation
orthogonal transformation to design the coordinate rotation
virtual impedance, improving the impedance characteristics of the
microgrid, compensating errors of power distribution and improving power decoupling performance; establishing a complete small-
signal dynamic model of the microgrid, wherein the small-
signal dynamic model comprises distributed energy sources, power
converters, loads and power grids, and guiding the selection of an optimal value on the basis of the small-
signal dynamic analytical method; and simultaneously, providing a theoretical basis for the optimization selection of
islanding microgrid
control parameters by using the small-signal dynamic analytical method, wherein the islanding microgrid
control parameters comprise droop control coefficients of the power distribution,
process identifier (PI) parameters of a
voltage current
feedback controller, feedforward control coefficients and the like. The microgrid after being subjected to optimization design in an islanded operational mode is capable of effectively achieving power decoupling and improving the accuracy of the power distribution, the stability of the
system and the dynamic performances.