Risk-based dynamic security assessment under typhoon weather for power transmission system

Risk-based method, which takes into account the probability and severity of contingencies, can be used to quantitatively assess the security level of power system, especially during severe weather. In this paper, a risk-based method to assess the dynamic security level of power system under typhoon weather is presented. The impact of typhoon on operational reliability of transmission lines is modeled firstly. An emergency control optimization problem is then addressed to measure the severity of each contingency, in which the cost of generation/load shedding is minimized and the transient stability constraint and post-contingency overload constraint are considered simultaneously. Case study on the New England system is conducted to demonstrate the effectiveness of the proposed method and the resultant emergency control scheme can provide feasible decision making against potential contingencies.