热电联产机组协调控制系统优化设计

Optimized Design of a Coordinated Control System for Cogeneration Units

依据典型的300 MW抽汽式热电联产机组简化非线性动态模型设计热电联产机组的常规协调控制系统,仿真发现,供热负荷在手动控制方式下被控对象增益随供热负荷增加而降低是导致协调控制系统性能变差的主要原因。针对此种情况提出一种增益补偿方法设计增益补偿逻辑,分别补偿锅炉侧、汽轮机侧对象增益变化,仿真试验表明该方法能有效改善抽汽调节蝶阀,在手动控制方式下或参数整定很弱的自动控制方式下机前压力的控制品质。

By making use of a simplified non-linear dynamic model for typical 300 MW steam extraction type cogeneration units,designed was a conventional coordinated control system for cogeneration units. The simulation results show that under the manual control mode,the fact that gains in parameters of the object under control will decrease with an increase of the heating load constitutes the main cause for deterioration in the performance of the coordinated control system. The authors designed a gain compensation logic,thus compensating changes in the gains of the object at the side of the boiler and steam turbine and effectively improving the quality in controlling the pressure before the unit under the condition of the steam extraction regulating butterfly valve being in a manual control mode or under the automatic control mode when the setting of the parameters is very weak.