关键词: 火电厂, 分散控制系统（DCS）, 网络实时性, 冗余切换, 运算周期

Abstract: As the core part of data processing and management of large thermal power generation units, the distributed control system (DCS) performs monitoring and control over mass real-time and historic operation data. Therefore its performance has great impacts on the secure and stable operation of the units. In this paper, the test study on the DCS performance is conducted for a 1 000-MW ultra- supercritical coal-fired power generation unit, which consists of real-time testing, redundancy testing, network performance testing and anti-interference testing. The testing methods are presented and the results are analyzed, such that both the existing problems and the potential issues of the system are discovered. At last, the corresponding suggestions on improving the stability and maintainability of the DCS system are put forward, which is of great importance to guide the unit tuning.

Key words: thermal power plant, distributed control system (DCS), real-time network, redundancy switching, operation cycle