DEH扫描周期对汽轮机控制系统的影响

Influence of DEH Scan Period on Steam Turbine Control System

汽轮机DEH具有固定的扫描周期,而所控制的对象却是连续系统,因此扫描周期的大小对于汽轮机的调节和保护系统具有一定的影响。通过仿真手段,对这一问题进行理论分析和探讨,结果表明,扫描周期对于汽轮机防超速保护影响较大,对汽轮机控制影响较小,这一结论对于汽轮机控制系统的设计和改造有参考作用。

Digital electro-hydraulic control system （DEH） owns fixed scan period, but the controlled target is continuous system. Therefore the scan period to some extent influences governing and control system of steam turbine. The paper theoretically analyzes and discusses this issue through simulation methods. The result shows that scan period greatly influences overspeed protection of steam turbine while seldom influences steam turbine. The conclusion provides reference for design and retrofit of steam turbine control system.