关于紧急控制与校正控制优化和协调的评述

A Review on Optimization and Coordination of Emergency Control and Correction Control

闭环离散控制是电力系统在大扰动后保持运行可靠性的主要手段,包括以故障驱动的紧急控制及由受扰轨迹驱动的校正控制。比较这2种方式的控制准则、动作时机、控制精度及代价,以及切机、切负荷和解列措施。若用紧急控制来应对小概率高风险的不确定因素,则在大多情况下将发生过控;若用校正控制来应对概率大的不确定因素,则机会成本很高。强调基于风险概念来协调这2种在物理和经济特性上都互补的控制方式,并提出解耦优化—聚合协调的求解方法。

Closed-loop discrete control is the main means for maintaining operational reliability of power systems subject to large disturbance, which includes fault-driven emergency control and trajectory-driven corrective control. This paper compares the criterion, execution time, precision and cost of the two control strategies, as well as their generator tripping, load shedding and network splitting actions. If an emergency control is used to cope with uncertain factors occurring in small probability and high risk, it will most likely lead to over-controlled results in most of operational scenarios. If correction control is used in this case to cope with the factors that have a large probability to occur, the opportunity cost would be high. Based on the risk analysis to emphasize a compromise between these two control strategies with consideration of their physical and economic characteristics, this paper proposes a method using decoupling-optimization and global-coordination to find a minimum risk solution.