凝结水节流快速变负荷与自恢复控制

为提升燃煤发电机组的快速变负荷能力,进而支撑中国规模化新能源电力的并网与安全运行,通过凝结水节流的快速变负荷与自恢复控制,实现了凝结水节流与传统协调控制的有机结合。基于机理分析与试验曲线辨识建立了凝结水节流调节的动态微增功率模型,给出了机组含凝结水节流调节的三入两出非线性控制模型;设计了一种融合凝结水节流调节与传统协调控制的新型变负荷控制策略,克服了凝结水节流对除氧器和凝汽器热井水位的影响;同时显著提升了机组的变负荷性能。在某300 MW机组上的仿真验证表明,所提控制策略显著改善了机组的变负荷性能,对于响应电网侧的一次调频具有重要意义。

Rapid Load-change Control of Condensate Throttling Considering Self-recovery

In order to improve the load change capability for the large-scale integration and safe operation of renewable energies, condensate throttling is combined with traditional boiler-turbine coordinated control by the rapid load control and self-recovery control of condensate throttling. The dynamic incremental power model of condensate throttling is set up based on mechanism analysis and data identification, and the unit nonlinear control model with 3 inputs and 2 outputs considering condensate throttling regulation is further developed. A novel load-change control strategy combining condensate throttling and boiler-turbine coordinated control is designed, which overcomes the influence of condensate throttling on water levels of deaerator and hot well, and meanwhile improves the load following capability. Finally, a test on a 300MW power unit proves that our strategy improves the load-change performance, which is with great significance to the primary frequency control of power grid.