分布式能源系统建模仿真及特性研究

发布时间：2018-08-28 11:55

【摘要】：天然气分布式能源系统在我国正如火如荼的发展,其作为一种新型的高效、清洁的能源利用形式,已经广泛应用于国内的工业园区及市内建筑中。建立天然气分布式能源系统高精度的实时仿真模型,对实现天然气分布式能源系统的经济性、安全性的评估,以及天然气分布式能源系统运行优化、控制优化的指导具有重要的现实意义。鉴于此,本文以典型天然气分布式能源系统机组设备为研究对象,基于Matlab/Simulink仿真平台,研究天然气分布式能源系统的动静态建模仿真。(1)燃气轮机建模算法的改进提出一种基于相似原理压气机特性混合建模的方法,即利用压气机通用特性方程确定模型结构,利用运行数据样本确定模型参数,并据此建立了LM2500+G4燃气轮机的压气机模型；针对LM2500+G4燃气轮机的结构特点,推导出相应的传热准则方程和热平衡方程,建立了LM2500+G4燃气轮机抽气冷却系数估算模型。仿真结果表明,修正的压气机特性曲线、建立的抽气冷却系数估算模型提高了LM2500+G4燃气轮机模型的仿真精度。(2)余热锅炉建模算法的改进基于传热学原理,推导出传热系数的烟气侧响应变工况模型,并考虑了传热效率对热平衡的影响,从而改进了双压余热锅炉的传热方程组；基于兼顾精度与效率的原则,改进了传热方程组的迭代计算策略；基于双压余热锅炉汽包的动态数学模型,以保持仿真精度、提高仿真速度为原则,通过优化模型的特性参数,解决了求解过程中的代数环问题。仿真结果表明,所建立的双压卧式非补燃余热锅炉动静态仿真模型,具有较高的仿真精度,且能够实现实时仿真。(3)天然气分布式能源系统一体化仿真平台的设计通过将LM2500+G4燃气轮机、双压卧式非补燃余热锅炉、抽凝式蒸汽轮机、双效蒸汽型溴化锂吸收式制冷机的动静态仿真模型依次连接,构成天然气分布式能源系统的动静态仿真模型；结合Matlab/GUI,构建天然气分布式能源系统一体化仿真平台,包含组态式描述系统组成,参数适配、人机交互界面与计算机识别等内容。仿真结果表明,所建立的天然气分布式能源系统动静态仿真模型具有较高的仿真精度,并能实现模型的实时仿真；所设计的天然气分布式能源系统一体化仿真平台实现了参数设置、仿真结果输出、数据实时分析以及数据存储等功能的一体化结合。(4)天然气分布式能源系统运行特性的研究以天然气分布式能源系统静态仿真模型为基础,模拟分析了大气温度、大气压力、燃料热值等影响因素对天然气分布式能源系统运行特性的影响规律。研究结果表明,大气温度、大气压力和燃料热值对天然气分布式能源系统联合循环的运行出力及效率具有重要的影响；在高温季节、高海拔地区、低品质燃料下运行天然气分布式能源系统,将大大降低联合循环的出力；为提高联合循环运行的经济性,应尽量使联合循环系统保持在低大气温度、低海拔以及高品质燃料的情况下运行。
[Abstract]:Natural gas distributed energy system is developing rapidly in China. As a new type of high efficiency and clean energy utilization form, it has been widely used in industrial parks and urban buildings in China. In view of this, this paper takes the typical natural gas distributed energy system unit equipment as the research object, and studies the dynamic and static modeling and Simulation of the natural gas distributed energy system based on the Matlab/Simulink simulation platform. (1) An improved gas turbine modeling algorithm based on similarity principle is proposed, which uses the compressor general characteristic equation to determine the model structure and the operating data samples to determine the model parameters. According to the characteristics, the corresponding heat transfer criterion equation and heat balance equation are deduced, and the estimation model of exhaust cooling coefficient of LM2500+G4 gas turbine is established. Based on the principle of heat transfer, the variable-condition model of flue gas side response with heat transfer coefficient is deduced, and the influence of heat transfer efficiency on heat balance is considered, so the heat transfer equations of dual-pressure waste heat boiler are improved; the iterative calculation strategy of the heat transfer equations is improved based on the principle of considering both accuracy and efficiency; and the steam drum of dual-pressure waste heat boiler is based on. The algebraic loop problem is solved by optimizing the characteristic parameters of the model. The simulation results show that the dynamic and static simulation model of the dual-pressure horizontal HRSG has high simulation accuracy and can be simulated in real time. The design of integrated simulation platform for gas distributed energy system consists of the dynamic and static simulation models of LM2500+G4 gas turbine, dual pressure horizontal non-supplementary combustion waste heat boiler, condensing steam turbine, double-effect steam LiBr absorption chiller, which are connected in turn to form the dynamic and static simulation model of natural gas distributed energy system. The simulation results show that the dynamic and static simulation model of natural gas distributed energy system has high simulation accuracy and can realize real-time simulation of the model. The integrated simulation platform of the natural gas distributed energy system realizes the integration of parameters setting, simulation results output, real-time data analysis and data storage. (4) The research of the operating characteristics of the natural gas distributed energy system is based on the static simulation model of the natural gas distributed energy system. The results show that atmospheric temperature, atmospheric pressure and fuel calorific value have important effects on the combined cycle output and efficiency of natural gas distributed energy system. In order to improve the economy of combined cycle operation, it is necessary to keep the combined cycle system operating at low atmospheric temperature, low altitude and high quality fuel.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK01

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