摘要
超临界与超超临界机组锅炉蒸发区容积小,蓄热利用能力差,汽水热力学特性决定蓄热系数随汽压变化的非线性严重,影响机组负荷响应速率;三输入三输出的协调控制系统对象结构对变负荷过程中的热量平衡与负荷调节的抗扰动能力提出了更高要求。通过对兰溪电厂超临界机组与玉环电厂超超临界机组2种不同协调控制策略的对比分析和应用完善,提出增加燃料超前指令初始变化梯度,分别调度煤、水超前指令时序与幅值,采用变比例焓控制器,增加过热度给水超弛调节回路等改进措施,改善过程协调性与容错性,收到了满意的效果。
Due to the small volume of evaporation area in supercritical and ultra supercritical boilers, the utilization capability of boiler heat-storage is weak. The thermodynamic characteristic of water and steam resuhs in the great nonlinear of heat-storage-coefficient with steam pressure and affects the load response rate of power unit. The object structure of 3-input-3-output CCS has even more strict criteria for the heat balance in load variation and the anti-disturbance capability for load regulation. Based on the comparison and analysis of two different coordinated control strategies in the supereritieal units of Lanxi Power Plant and the uhra supereritieal units of Yuhuan Power Plant, the improving measures were suggested. This includes to increase the initial gradient of advance fuel flow instruction, separately regulate the sequence and amplitude of fuel and water flow advance instruction, use variable-proportion enthalpy controller, add an overriding feedwater controller to prevent overheat, etc. The coordination and fauh-toleranee performance in control process were improved with favorable effect.
出处
《中国电力》
CSCD
北大核心
2008年第3期66-69,共4页
Electric Power
关键词
超临界机组
超超临界机组
协调控制
控制特性
控制策略
supercritical unit
uhra supercritical unit
CCS
control characteristics
control strategy
