BP-Model-Based Quench Detection Method for Double-Stator HTS-Excitation Field- Modulation Machine

The quench of high-temperature-superconducting (HTS)-excitation coil is one of the key issues affecting the safe and stable operation of the double-stator HTS field-modulation (DS-HTSFM) machine. At present, the conventional method for inductive voltage noise filtering from quench voltage is to adopt analog low-pass filter. However, when it encounters serious interference, the limited filtering ability of traditional low-pass filter is not enough to completely filter out the coupled inductive voltage from the quench voltage, which will increase the misjudgment of quench detection. Therefore, a back-propagation (BP) network model is innovatively introduced to further filter the inductive voltage for the second time following by the primary low-pass filter, aiming at the improvement of quench detection accuracy for the HTS-excitation coil equipped in the analyzed DS-HTSFM machine, and its validity is verified by comparison with experimental results.