A novel compensation current detection method based on the improved instantaneous symmetrical components is proposed for DSTATCOM to compensate three phase unbalance load current.The principle of the proposed approach is based on the undelayed rotating vector which enables to calculate the positive sequence component

negative sequence component and zero sequence component of the three phase instantaneous variables.The problem of traditional symmetrical components is solved by using the proposed method.The novel current detection is tested by means of detailed simulation using PSCAD/EMTDC

where the performance is validated in the case of severe network fault and in the case of unbalanced load compensation.The results verify the improved instantaneous symmetrical component is more suitable for compensation current detection.