Study Of Fault Current Limiter Based On Magnetic Controllable Reactor

With the development of electric power industry, the scale of power system is expanding. It has new and higher requirements of grid's security, stability, reliable operation. As one of the important measures to ensure the grid's safety and stability, the fault current limiter becomes the hotspot of power system research.Firstly, the structure and basic work principle of the magnetically-saturated controllable reactor (MSCR) are analyzed in detail. The electromagnetic equations are given for all the reactor working states. According to the relationship between variables in the equations, the reactor simulation model was built. The characteristics are analyzed. Theoretical analysis shows that MSCR has the merits: smaller harmonic, faster response speed, approximate linear volt-ampere characteristics, etc.Secondly, the working principle of the Magnet-control fault current limiter (MCFCL) and work processes of the normal and fault current-limited modes were discussed. The several key technical indicators were defined and explained in this paper. The constraint relation of several important parameters in the normal and fault current-limited modes was established. The MCFCL's research contents under different modes were simulated respectively with Matlab. The simulation results confirm that the MCFCL restrains the fault current effectively.Finally, the MCFCL's response speed and its related factors were analyzed. A method was presented to improve the response speed. The proper range scope of the MCFCL core winding tap ratio was described. All above work demonstrates the feasibility and superiority of MCFCL from both theory and simulation. It lays the foundation for MCFCL's follow- research and development.