预测模糊控制在液化天然气调峰系统的应用

目前液化天然气(LNG)汽化站通常将储罐压力调节和调峰技术分离,因此存在系统相对复杂、投入资金大等问题.通过论证研究,提出一种将储罐压力调节和调峰技术相结合的LNG汽化站控制系统,并针对储罐压力系统因存在液气转换、大滞后、时变等特点而易失控的问题,以单值广义预测模糊控制算法为核心,采用模糊控制进行动态反馈补偿的控制策略,结合DSP和FPGA器件高速数据处理的特点,以达到储罐压力实时、精确控制的目的.系统实际运行情况表明:该控制器具有调节快速、实时性好、鲁棒性强等特点;汽化站出口压力波动不超过3.5%,实现了良好的调峰效果.该系统具有结构简单、抗干扰能力强、调峰效果好等特点,为城市燃气调峰提供了新思路.

The application of predictive fuzzy control in the liquefied natural gas peak-shaving system

LNG(liquefied natural gas) gasification station resently usually separates the tank pressure adjustment from the peak‐shaving technique ,so the system is relatively complex and need a large in‐vestment .Through demonstration research ,a system scheme which was combined by the tank pres‐sure adjustment and peak‐shaving technique was proposed .Aiming at the characteristics of large lag , time‐varying and nonlinear in the storage tank pressure system ,the control strategy by taking the generalized predictive control algorithm as the core and the fuzzy control as dynamic feedback compen‐sation was adopted .Accurate pressure control of the storage tank was realized combining with the characteristics of DSP and FPGA device for high‐speed data processing .In system practical operation , the control was proved with the advantages of quick adjustment ,real‐time and strong robustness . And the results showed that the outlet pressure fluctuation of the gasification station was less than 3 . 5% ,and it had a good peak‐shaving effect .This system has the characteristics of simple structure , strong anti‐interference ability and good peak‐shaving effect .And it provides a new idea for city gas peak‐shaving system .