火电机组AGC系统优化的技术措施研究

火电机组在锅炉低氮燃烧和脱硝系统改造以后，针对影响AGC系统投入的因素，分析原因并采取相应措施，完善机组负荷控制策略，包括锅炉主控前馈信号，汽轮机负荷指令，一次调频控制逻辑，一次风压调整负荷，磨煤机容量风、热风和旁路风挡板控制回路；根据锅炉特性变化，完善燃烧控制模型；通过解决影响AGC系统投入问题以后的技术经济性分析，机组主要被控参数指标对比表明，该技术措施的研究与实施显著提高了机组AGC的品质指标。

Study on Technical Measures for AGC Optimization in Fossil Fuel Power Plants

Aiming at the factors affecting the operation of AGC (Automatic Generation Control) system after the low NOx combustion retrofit implemented in the boiler, the reason analysis is conducted, and the specific measures are taken to improve the unit load control strategies. The measures include the boiler master control feedforward signal, the steam turbine load demand, the primary frequency control logic, the load adjustment by PAP (primary air pressure), and the control loops of the mill hot air and bypass air dampers. In addition, the combustion control model is improved based on the changes of the boiler’s features. The technical and economic analysis on these measures and the comparison between the control parameters have shown that the AGC indices are enhanced substantially.