Implementation of Power System Security and Reliability Considering Risk Under Environment of Electricity Market

Abstract

From the viewpoint of risk the power system security and reliability under the environment of electricity market were researched. Because in competitive electricity market the power generation companies, power grid companies and load service entities belong to different economic bodies respectively, so that in the system operation, planning and design the consideration of the factors impacting system security and reliability is obviously different from those in traditional power systems. For the secure and reliable operation of power system under market environment, following aspects, such as power network planning and operation, ancillary service, anti-fault automation devices and the implementation of system security and reliability, were researched and it was pointed out that the economy and security would no more be expressed as two independent indices, the system security and reliability would be blended each other, and the security index of traditional power system would no more exist independently, but would exist as a measure that might bring economic benefit to relevant company. What whether a certain security index of traditional power system would be performed under market environment and to what extent it might be performed would depend upon the economic profit that might be brought to relevant company from the performance of the index. According to such a change, on the basis of implementing the security and reliability of traditional power system under market environment two approaches to implement system security and reliability, which were based on the maximization of social effect and the maximization of power grid company's economic benefit under the prerequisite of ensuring the economic benefit of power grid company's users, were proposed. The proposed two methods provided new thinking for economically implementing system security and reliability under market environment