Leakage inductance calculation and simulation research of extra-high voltage magnetically controlled shunt reactor

Because of the relatively high charging capacitance of Ultra High Voltage transmission lines, the contradiction between UHV transmission line´s over-voltage limitation strategy and its reactive power compensation strategy becomes prominent, while fix controllable reactors on UHV line´s can solve this contradiction. After the magnetic circuit structure and working principles of 500kV magnetically controlled shunt reactor (MCSR) are analyzed, and the simulation model of MCSR is established by the magnetic circuit decomposition approach in Matlab/Simulink in this paper. From the point of leakage inductance of each winding in MCSR, the energy method was used to calculation the leakage inductance by the 3D finite element method (FEM) model. The result indicated that the magnetic flux leakage of each winding is increased by the increase of the saturation, while the leakage inductance of each winding is decreased by the increase of the saturation, and finally stabilized at a regular value. Simulation results reflect the actual operating conditions of MCSR, the model and algorithm provides necessary simulation means for UHV and EHV MCSR analysis.