深调峰工况下锅炉虚假水位预测  

Prediction of Boiler False Water Level Under Deep Peak Load Regulation Conditions

作　　者：刘暑辉 田亮[1] LIU Shuhui;TIAN Liang(School of Control and Computer Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学控制与计算机工程学院,保定071003

出　　处：《南方能源建设》2020年第1期70-75,共6页Southern Energy Construction

基　　金：国家重点研发计划资助项目(2017YFB0902100);中央高校基本科研业务费专项资金资助(2017MS132)。

摘　　要：[目的]火电机组深调峰工况运行"虚假水位"现象严重影响机组安全运行,准确预测虚假水位出现时刻和幅度能够优化控制系统设计。[方法]研究思路为:将实际水位看作真实水位和虚假水位两部分的叠加,先根据能量平衡和物质平衡建立汽包水位模型计算出真实水位,再用实际水位减真实水位得到虚假水位,然后利用小波分析燃料量、汽包压力等信号与虚假水位信号在不同时间空间尺度下的相关性。[结果]通过对某600 MW机组深调峰负荷段运行数据进行分析,发现通过机理建模有效消除了给水流量和蒸汽流量对虚假水位信号波动的影响;在0.062 5 Hz至0.125 Hz频段,燃料量和汽包压力分别与虚假水位信号呈强相关性。[结论]可以辅助判断虚假水位的产生及其波动幅度。[Introduction]The phenomenon of false water level in the operation of the thermal power unit deep-peak peak operation seriously affects the safe operation of the unit. Accurately predicts the timing and amplitude of the false water level can optimize the control system design. [Method]Research ideas: the actual water level was regarded as the superposition of the real water level and the false water level. Firstly, the water level model was established according to the energy balance and material balance to calculate the real water level, and then the actual water level was used to reduce the real water level to obtain the false water level, and then used wavelet to analyze the correlation between the fuel quantity, steam drum pressure and other signals and the false water level signal at different time and space scales. [Result]By analyzing the operation data of the deep peak load section of a 600 MW unit, it is found that the influence of feed water flow and steam flow on the false water level signal is effectively eliminated by mechanism modeling;in the frequency band of 0.062 5 Hz to 0.125 Hz, the fuel quantity and the steam drum pressure are strongly correlated with the false water level signal, respectively. [Conclusion]It can help determine the occurrence of false water level and its fluctuation range.

关 键 词：小波变换 虚假水位 真实水位 多尺度相关 机理建模 

分 类 号：TM611[电气工程—电力系统及自动化] TM621