When the power supply of superconducting magnet for Comprehensive Research Facility for Fusion Technology (CRAFT) is operating under short circuit condition and overload, the commutation overlap angle changes dynamically, which greatly increases the complexity in the system modeling and the difficulty in control. To solve these problems, by replacing the circular arc with small bowstring, the dynamic mathematical model under short-circuit operation can be simplified. In order to precisely adjust the impact speed and amplitude of impulse current under short circuit operation, an open-loop control strategy is proposed based on dynamic mathematical model, which can get the excellent performances, inherent stability, fast response and no overshoot. The instantaneous current sharing control strategy using virtual impedance is designed to solve the problem of serious overload and dynamic current sharing under short circuit operation, which thereby ensures the overall overload capacity of superconducting magnet power supply. At last, simulations and experiments are conducted, and results validate the feasibility of the proposed methods.

聚变技术综合研究设施（CRAFT）超导磁体电源在短路和过载情况下工作时，换向重叠角动态变化，大大增加了系统建模的复杂性和控制难度。为了解决这些问题，通过用小弓弦代替圆弧，可以简化短路操作下的动态数学模型。为了精确调节短路运行下冲击电流的冲击速度和幅值，提出了一种基于动态数学模型的开环控制策略，该策略具有性能优良、固有稳定性好、响应快、无超调等特点。采用虚拟阻抗的瞬时均流控制策略旨在解决短路运行下的严重过载和动态均流问题，从而保证超导磁体电源的整体过载能力。最后，进行了仿真和实验，结果验证了所提方法的可行性。