中文摘要：

在竞争的电力市场中，由于发电公司、电网公司和供电公司分属不同的经济实体，各自首要的目标是追求利益最大化。经济当量由扰动情况下电网供（用）电可靠性提高所带来的收益增加及为满足该类安全性措施所需支付的辅助服务费用组成。该文基于经济当量并在不影响电网公司用户经济利益前提下提出了电网公司效益最大化安全性确定方法的数学模型，所提算法计算速度快、易于实现，可保障合理的系统安全性运行有利于总体电价的降低。传统电力系统中的某一安全性指标在市场环境下是否会得到执行、执行到何种程度将取决于其经济当量值，只有当其经济当量值大于零，该安全性校验措施的执行才是可行的，而且其经济当量值越大，运行性能越优。最后，文中以IEEE32机24节点可靠性测试系统为例，检测了所提模型的合理性及算法的可行性。

英文摘要：

Because in competitive electricity market power companies, grid companies and power supply companies belong to different economic entities, the first goal of all the participants is to maximize their profits. The economic equivalent of security and reliability measure is based on the difference of the economic profits brought by the security and reliability measure and the cost needed by the implementation of the security measure. A method and algorithm for security operation based on the economic equivalent was put forward under the maximum grid company profit, it must be performed with the user＇s profit insured. This model takes into account the transient stability constraints and contingency occurrence probability and system instability impacts. Furthermore, the algorithm presented here is characterized with high computing speed and can be easily realized. The new method gives an entirely new way for economic determination of power system security and reliability. How a security measure of traditional power system is carried out depends on its economic equivalent. Only when its economic equivalent is larger than zero a security measure can be carried. Finally, the rationality of the model and the feasibility of the algorithm developed here are demonstrated by taking the IEEE RTS 32-machine 24-node power system as an illustrative system.