Risk quantitative assessment of emergency control measures to improve power grid transmission capacity

Transregional interconnection of power systems, large-scale integration of renewable energy and interaction on the demand side are bringing new challenges to the operation of large-scale power system, such as complexity, uncertainty and riskiness. A risk quantitative assessment method of emergency control measures is proposed to improve power grid transmission capacity based on a study of the risk assessment model. Both the cost of emergency control measures of generator tripping, load shedding and HVDC modulation and stabilized control strategies influenced by Rule 599, are taken into consideration in this method. The transient stability level of power systems will be quantitatively assessed in the form of transient instability risk index. Also the influence of different control quantities on risk values is analyzed. By combining power grid security and stability with economy, this paper characterizes the cost of improving unit transmission capacity by utilizing the index to achieve the goal of comprehensively evaluating and screening emergency control measures.