Abstract: This paper analyzes ±500 kv During the daily operation of the DC filter in the Yongren converter station or when the DC filter exits the operation for some reason, the pole control system judges that the DC filter has no protection operation due to the fault of both sets of protection of the DC filter caused by the operator's misoperation and the maintenance personnel's inadequate safety measures. The pole control system will send esof to lock the corresponding pole, which will reduce the DC transmission capacity of Yongfu by half It is a waste of clean energy and a threat to the safe and stable operation of the power grid. In view of the existing risks, this paper analyzes them and puts forward the transformation plan, which fundamentally solves the uncontrollable risks such as system misoperation and human misoperation, optimizes the system judgment logic, and minimizes the consequences of protection misoperation caused by uncontrollable factors。