Diode rectifier unit(DRU)-based high-voltage direct current(HVDC)transmissionsystems areeffectivein achieving the stableandeconomical operation of offshore wind-powergeneration.Considering theuncontrollable characteri...Diode rectifier unit(DRU)-based high-voltage direct current(HVDC)transmissionsystems areeffectivein achieving the stableandeconomical operation of offshore wind-powergeneration.Considering theuncontrollable characteristicsof DRUs,a grid-forming(GFM)strategy forwind-turbine converters isnecessary to support offshore AC voltageand frequency.However,the active power-synchronization control in traditional GFM converters is unsuitable for DRU-based GFM converters.Thus,the stability issue for DRU-based HVDC systems involving DRU-based GFM and grid-following(GFL)converters has not yet been addressed.To solve these issues,this study begins with the characteristics of a DRU-based HVDC system and presents a control scheme for DRU-based GFM converters for power synchronization.Subsequently,the dq-frame impedance model of the DRU-based GFM converteris proposed for the stability analysis of the entire HVDC system.Finally,a simulation platform is built to verify the model accuracy and system stability.展开更多
基金Supported by State Key Laboratory of HVDC(SKLHVDC-2023-KF-09).
文摘Diode rectifier unit(DRU)-based high-voltage direct current(HVDC)transmissionsystems areeffectivein achieving the stableandeconomical operation of offshore wind-powergeneration.Considering theuncontrollable characteristicsof DRUs,a grid-forming(GFM)strategy forwind-turbine converters isnecessary to support offshore AC voltageand frequency.However,the active power-synchronization control in traditional GFM converters is unsuitable for DRU-based GFM converters.Thus,the stability issue for DRU-based HVDC systems involving DRU-based GFM and grid-following(GFL)converters has not yet been addressed.To solve these issues,this study begins with the characteristics of a DRU-based HVDC system and presents a control scheme for DRU-based GFM converters for power synchronization.Subsequently,the dq-frame impedance model of the DRU-based GFM converteris proposed for the stability analysis of the entire HVDC system.Finally,a simulation platform is built to verify the model accuracy and system stability.
