Calculation of current-limiting reactors and simulation analysis of a controllable reactor of transformer type

This paper clarifies the operating principles of a controllable reactor of transformer type (CRT), which possesses such advantages as smooth power regulation, low current harmonic content, and fast response. By combining the MMF and branch current equations, an expanded equation about the winding currents and current-limiting reactances is obtained. According to the feature that the control windings are short-circuited in turn, the current-limiting reactances are calculated for each control winding step by step. A simulation model for a CRT is fabricated with MATLAB/SIMULINK/PSB. The simulation results confirmed the presented work, which underpins the further analysis and design of a CRT.