Magnetic modeling of virtual controllable reactor for reactive power optimization of power grid

A new type of MCR is proposed in this paper, which uses the multistage virtual air-gap structure. Setting multiple silicon steel sheet in the core section to replace not-conductive magnetic material to form a virtual air-gap. Finite saturation technology of silicon steel sheet is adopted in order to adjust inductance smoothly with changing the DC bias making virtual air-gap work under different saturation state. The feasibility of this new MCR is verified by preliminary field modeling and electromagnetic transient analysis imported into PSCAD platform in the form of ex-function.