Modeling and Simulation of Continuously Variable Series Reactor for Power System Transient Analysis

The continuously variable series reactor (CVSR) is a series line reactor designed for power flow control in meshed power system networks. The CVSR is controllable using a variable dc source which establishes the magnetization of the ferromagnetic core and enables continuous modulation of the line reactance. Synthesizing a model that describes operation of the CVSR in ac networks presents challenges in that the nonlinearity of the core and distribution of fluxes at different operating states present additional complexity. This paper describes a method to model CVSR operation with respect to its ac terminals using a look-up table compiled from finite element analysis (FEA), thus avoiding complex magnetic circuit models. The resulting method is applicable to electromagnetic transient simulation tools for power system analysis.