Overview on VDCOL Control Strategy for Improving DC System Recovery Characteristics
The voltage dependent current order limiter (VDCOL) control can effectively improve DC system recovery performance after faults,amd its control parameters obviously influence the recovery features.In combination with the VDCOL research status worldwide,the typical optimization control strategies of VDCOL are classified and summarized,and their optimal control principles are expounded.The influencing factors of coordinated recovery of multi-infeed HVDC system are introduced.The optimization process needs to solve two basic problems,namely the characteristics of VDCOL and time-delay constant for various DC.Finally,some points and research direction are discussed for the VDCOL control.
VDCOLcoordinated recoveryparameter optimizationadvanced control