电力市场条件下电力系统可靠性问题

在竞争的电力市场中，发电机组投资的决策取决于项目的回报，而不是预期的备用率，因此，与发电系统有关的可靠性是由电能价格来维持的；在电力市场环境下，电力交易瞬息万变，电力调度既要保证公平竞争，又要保证安全运行，因而必须全面审定并研究和制订新的安全运行导则，并开发新的为运行服务的软件；辅助服务是电力市场最重要的特征之一，关系电力系统的安全运行与可靠性；现代继电保护已发展为非常可靠的系统，但原有的保护原则

POWER SYSTEM RELIABILITY ISSUES IN POWER MARKET ENVIRONMENT

It is vital to carefully consider the impact on power system security and reliability when the existing structure ofelectric power industry is transferred into a competitive power market model. First. generation related reliability criteria arecomplemented. supplemented or even replaced by energy market prices and commercial performance incentives. Secondly,how we meet reliability standards in a large integrated power system open to competition is quite different from how we metthem when we operated in the traditional power industry. Thirdly, the ancillary service is an important measure to maintainreliability. How to define and price it must be carefully considered. At last, relay protection and security control systems willface new issues such as how to set relay protection systems in the deregulated system. This paper introduces these importantissues and challenges. Suggestions for revising the security and reliability codes of power systems are also presented.This project is supported by National Natural Science Foundation of China (No. 59937150).