A cascading failure model and high-risk line identification based on an optimal risk index

作者：Ding Xueyang; Liu Xindong^*

来源：Automation of Electric Power Systems, 2011, 35(18): 7-10+86.

• Blackout model
• Capacity improvement
• Cascading failures
• Delay Time
• Direct current power
• External circulation
• Improved models
• Internal circulations
• Line capacity
• New model
• Operational planning
• Original model
• Outage probability
• Risk indices
• Risk theory
• Risk value

Through detailed analysis of the defects of OPA and its improved model, a new model based on the risk theory is proposed. The new model includes internal and external circulations. The internal circulation is based on traditional linear programming of direct current power flow to describe the cascading line overload and failure. The external circulation includes load growing and line capacity improvement, and the later is based on the risk theory. Whether to improve the line capacity and the degree of line capacity improvement are determined by risk index of line capacity improvement, delay time of capacity improvement, improvement degree function and line risk value. A new prevention strategy for cascading failure is proposed by identifying the high-risk lines and defining optimal risk index of line capacity improvement which minimizes capacity improvement cost and load loss. Finally, by comparing the outage probability, load loss and risk index between the original model and the new model, the reliability and practicability of the new model are illustrated. ? 2011 State Grid Electric Power Research Institute Press.

• 出版日期2011-9-25
• 单位暨南大学