Comprehensive decision-making of power grid DC de-icing plan based on equivalent net-ability method

When the power grid suffers a wide range of freezing disasters, how to make a reasonable DC de-icing plan of transmission line became a urgent problem for the dispatchers. For the reason the DC de-icing ranking evaluating indicator of transmission line and the comprehensive index on net-ability drop are proposed to develop the power grid DC de-icing plan. The DC de-icing ranking evaluating indicator of transmission line is proposed to distinguish DC de-icing urgency of transmission lines. The importance of transmission line, the current rate of icing-coating and the predicted rate of icing-coating are the three attribute factors of the evaluating indicator, the weights of which are determined by the method of weighted average combinative evaluation. The comprehensive index on net-ability drop is used to reflect the system security. The transmission line DC de-icing group which would pose a serious threat to system security will not appear if planning the power grid DC de-icing plan based on the proposed equivalent net-ability method. DC de-icing comprehensive decision-making method of power grid is proposed with overall consideration of the emergence of transmission line DC de-icing and the power system security, the effectiveness and feasibility of which are demonstrated by the example of Guizhou power grid. The DC de-icing comprehensive decision-making method of power grid would be a good reference for the dispatcher to make DC de-icing plan g.