槽式光热发电典型热工过程控制系统设计

Design on typical thermal process control systems for trough solar power

针对槽式光热发电系统,结合火电厂控制系统设计经验,提出了包括机组负荷-供能控制系统、蒸汽发生器水位控制系统和过热蒸汽温度控制系统的槽式光热发电典型热工过程控制系统的设计方案。为了解决机组负荷和供能之间的耦合关系,提出了光热供能跟随汽轮机、汽轮机跟随光热供能、以光热供能跟随为基础的协调控制以及以汽轮机跟随为基础的协调控制等4种负荷-供能控制方案;为了降低蒸汽发生器水位系统中"虚假水位"现象对控制性能的影响,提出了蒸汽发生器三冲量串级汽包水位控制方案;为了补偿过热汽温大惯性、大时延的特性,提出了过热蒸汽温度内外环控制方案。该研究可以为槽式光热发电控制系统设计提供参考。

According to the trough solar power system, refer to the control system design experience of thermal power plant, several control system design schemes on the typical thermal processes have been provided for the unit load and energy supply control system, the drum water level control system and the super-heated steam temperature control system. In order to process the coupling relationship between unit load and energy supply, four kinds of unit load and energy supply control systems have been put forward including the control scheme of solar supply following steam turbine, the control scheme of steam turbine following solar supply, the coordination control based on solar supply following steam turbine and the coordination control scheme based on steam turbine following solar supply. For reducing the effect of ＂false water level＂ phenomenon which may probably occur in water level control system of steam drum, a steam drum level control system of cascade-three parameter has been presented. For compensating the characteristics of large inertia and dominant time delay of super-heated steam temperature, an inner and outer loop control schemes of super-heated steam temperature have also been proposed. This paper can provide a reference to the trough solar power control system design.