An Adaptive Reclosing Scheme Based on Phase Characteristics for MMC-HVDC Systems

To improve the reliability of power supply, reclosing schemes are required after transient faults, which commonly occur in overhead line based high voltage DC (HVDC) systems. However, event permanent auto-reclosing scheme may cause a severe strike. avoid impacts caused by fault type should be discriminated before activating scheme. Therefore, an adaptive on phase characteristics is proposed this paper. Firstly, modulation periodic actively controlling hybrid circuit breaker (DCCB) introduced. Then, cascaded ? equivalent model and its decoupling algorithm presented to analyze frequency-domain measured impedance coupled lines. From characteristics, frequency detecting determined features at primary frequency. The or faults can thus accurately identified using these different with negligible influence healthy In addition, robust various resistances, leading improved reliability. effectiveness verified PSCAD/EMTDC.