【作者】 赵岩；

【导师】 刘胜；

【作者基本信息】 哈尔滨工程大学 ， 控制科学与工程， 2019， 硕士

【摘要】 本文从工程实际需求出发,进行了天然气压气站燃气轮机热能回收利用的燃气-蒸汽联合循环控制系统的研究。首先,本文提出了利用燃气-蒸汽联合循环原理对压气站燃气轮机进行改造的技术方案。技术方案将压气站改造成为独立运行的燃气-蒸汽联合循环电站,在原有设备的基础上,增加余热锅炉、蒸汽轮机、发电机、电动机以及辅助设备,并且根据设备选型的原则确定了主要设备的技术参数。压气站通过电力驱动压缩机为天然气管道加压,充分发挥了“电力拖动”灵活、高效、方便的特点,不仅提高了单台燃机的效率,同时减少了一台燃气轮机使用,提高了压气站燃料的整体效率。其次,本文基于模块化建模思想,研究分析了联合循环各主要部件的结构、原理及运行特性,建立了燃气轮机、余热锅炉及蒸汽轮机的热力学模型,通过各模块间重要参数的相互联系,构建了整体的联合循环热力学模型。并通过与同型燃机实际运行数据的对比,对模型加以验证。然后,针对压气站负荷变化量大、变化频繁、变化可预知不可控的特点,本文设计了模糊PID控制器并对其进行优化。提出了基于负载运行状态监测及负荷变化量预测的燃机-汽机协同负荷分配控制策略,提高了联合循环控制系统应对大负荷冲击时的调节能力。最后,通过联合循环控制系统在各工况点的静态仿真和动态仿真实验,得出了联合循环燃料值与总功率的关系曲线。仿真结果表明,模糊PID控制器与协同负荷分配控制策略大幅改善了联合循环控制系统应对负荷变化的技术指标,使其能够满足压气站负荷变化频繁、变化量的特定的控制要求。本文的研究成果对燃气-蒸汽联合循环的控制系统的工程应用具有理论意义和应用前景。更多还原

【Abstract】 In this paper,based on the actual demand of engineering,the gas-steam combined cycle control system for heat recovery and utilization of gas turbine in natural gas compressor station is studied.Firstly,this paper puts forward the technical scheme of reforming the gas turbine of the compressor station by using the principle of gas-steam combined cycle.The technical scheme transforms the compressor station into an independent gas-steam combined cycle power station.Based on the original equipment,the waste heat boiler,steam turbine,generator,motor and auxiliary equipment are added,and the technical parameters of the main equipment are determined according to the principle of equipment type selection.The compressor is driven by electric power to pressurize the natural gas pipeline.The scheme gives full play to the flexible,efficient and convenient characteristics of "electric power drive",which not only improves the efficiency of a single gas turbine,but also reduces the use of a gas turbine and improves the overall fuel efficiency of the compressor station.Secondly,based on the thought of modular modeling,this paper studies and analyzes the structure,principle and operation characteristics of the main components of the combined cycle.Then,this paper establishes the thermodynamic model of gas turbine,waste heat boiler and steam turbine,and builds the overall thermodynamic model of the combined cycle through the interaction of important parameters among the modules.The model is verified by comparing with the actual operation data of the same type gas turbine.Then,aiming at the characteristics of large change,frequent change and predictable and uncontrollable change of compressor station load,a fuzzy PID controller is designed and optimized in this paper.Based on the monitoring of load operation state and the prediction of load change,the control strategy of cooperative load distribution of gas turbine and turbine was proposed to improve the capacity of the combined cycle control system to cope with large load shocks.Finally,the relationship between the fuel value of the combined cycle and the total power is obtained through static simulation and dynamic simulation experiments of the combined cycle control system at various operating conditions.The simulation results show that the fuzzy PID controller and the coordinated load distribution control strategy greatly improve the technical indexes of the combined cycle control system to cope with the load changes,so that it can meet the specific control requirements of frequent and variable load of the compressor station.The research achievement of this paper has theoretical significance and application prospect for the engineering application of gas-steam combined cycle control system.更多还原