Phase‐Segregated Injection Method for Arc Suppression With Cascaded H‐Bridge Inverters Considering Line Voltage Drop

ABSTRACT The traditional phase‐segregated arc suppression (AS) methods often neglect the influence of line voltage drop (LVD), resulting in the problem of large residual current when single‐line‐to‐ground (SLG) faults occur at the end of heavily loaded lines, making reliable AS difficult. To effectively suppress fault currents during medium and low impedance SLG faults at the end of heavily loaded lines, the phase‐segregated AS method considering LVD is proposed in this paper. Additionally, the phase‐segregated AS method, which is based on sliding mode control using an exponential convergence rate, is utilized to reduce the total harmonics distortion of fault current and neutral point voltage after current injection. The simulation results validate the effectiveness of the proposed method under the case of the medium or low impedance ground fault occurring at the end of heavily loaded lines.