集中供热系统优化控制方案的模糊综合评价研究
发布时间：2019-04-15 11:35
【摘要】：供热系统实行分户计量后，热用户的自主调节行为使集中供热混水系统变流量运行。稳态控制方法在供热系统为变流量的情况下并不适应。主要原因为热量在传递过程中存在延迟。这要求系统必须采用适当的控制设备进行动态的控制。本文的目的是建立供热系统仿真模型，研究供热系统在变流量运行过程中，一次网和二次网的流量和压力的动态变化，采用合理的调节策略和控制方案，确定最优的末端压差控制方案，实现系统的运行稳定和节能要求。 首先，分析集中供热系统主要设备的仿真模型，特别针对集中供热管网，提出了基于基本回路法的水力工况模拟与分析方法，对供热管网拓扑结构节点关联矩阵和回路矩阵的计算机生成方法进行了深入的分析研究。应用图论描述管网的拓扑结构，引入描述热源和热用户信息的峰阵，提出了利用峰阵自动生成基本关联矩阵和独立回路矩阵的实用方法。该方法可以简化管网计算，缩短整个管网计算过程的时间，减少原始数据的准备工作量和难度，为供热管网的动态模拟、优化调节的方案研究提供了方便。在此基础上编制了计算程序，通过算例验证了该方法的正确性和实用性。并且建立了集中供热系统的仿真平台，为控制方案的优化选择提供基础。 然后，针对分户计量混水系统提出适应供热管网动态特性的调节策略和控制方案，即针对实际供热系统，提出多组压差控制点和压差设定值的末端压差优化控制方案，并且利用时间序列模型进行负荷预测，利用预测的负荷，确定系统的供水温度，使得热量输送到各热力站时刚好满足当前的负荷需求。这样，能够减少热延迟给供热调节带来的影响，更进一步的实现按需供热。 最后，针对集中供热管网变流量系统的运行特点，将模糊综合评价法应用于控制方案的寻优评价。分析了采用模糊综合评价方法评价控制方案的必要性，建立了集中供热系统控制方案的评价体系。建立集中供热系统的动态模拟仿真平台，应用实例，深入的评价研究了变流量系统的末端压差控制方案。确定控制方案的评价指标，采用模糊综合评价法进行评价，选择最优的压差控制方案。通过实例验证了评价模型的正确性和实用性，，为供热系统的节能运行提供了理论基础和方法。集中供热系统变流量运行的优化控制研究起步较晚，缺乏真实可靠的原始数据以及统一规范的管网信息库，模糊综合评价法正好弥补了此方面的不足，它不仅能够量化一些难以回避的模糊概念，而且能够使对系统控制方案的评价主观和客观相统一。
[Abstract]:After the household metering is carried out in the heating system, the self-regulating behavior of the thermal user makes the variable flow rate of the central heating mixing water system run. The steady-state control method is not suitable when the heating system is variable flow rate. The main reason is that there is delay in the transfer of heat. This requires the system to adopt appropriate control equipment for dynamic control. The purpose of this paper is to establish a simulation model of heating system, to study the dynamic change of flow and pressure of primary and secondary networks during the operation of heating system with variable discharge, and to adopt reasonable regulation strategy and control scheme. The optimal terminal pressure difference control scheme is determined to realize the stable operation and energy saving requirements of the system. Firstly, the simulation model of the main equipment of the central heating system is analyzed, especially for the central heating pipe network, the simulation and analysis method of hydraulic condition based on the basic loop method is put forward. The computer generation method of node association matrix and loop matrix for topology structure of heat supply network is studied in this paper. The topological structure of pipe network is described by graph theory. The peak matrix describing heat source and thermal user information is introduced. A practical method of automatically generating basic correlation matrix and independent loop matrix by using peak matrix is presented. This method can simplify the calculation of the pipe network, shorten the time of the whole calculation process of the pipe network, reduce the workload and difficulty of the preparation of the original data, and provide convenience for the study of the dynamic simulation and the optimization of the regulation scheme of the heating pipe network. On the basis of this, the calculation program is compiled, and the correctness and practicability of the method are verified by an example. The simulation platform of the central heating system is established, which provides the basis for the optimal selection of the control scheme. Then, according to the household metering mixed water system, the regulation strategy and control scheme to adapt to the dynamic characteristics of heating pipe network are put forward, that is, for the actual heating system, the optimal control scheme of the end pressure difference of multi-groups of pressure difference control points and pressure differential setting values is put forward. And the time series model is used to forecast the load, and the water supply temperature of the system is determined by using the predicted load, so that the heat transfer to the thermal power stations can meet the current load demand. In this way, the effect of heat delay on heating regulation can be reduced, and the on-demand heating can be further realized. Finally, the fuzzy comprehensive evaluation method is applied to the optimization evaluation of the control scheme according to the operation characteristics of the variable discharge system of the central heating network. The necessity of using fuzzy comprehensive evaluation method to evaluate the control scheme is analyzed, and the evaluation system of the control scheme of central heating system is established. The dynamic simulation platform of central heating system is established, and the terminal pressure difference control scheme of variable flow system is deeply evaluated and studied by using an example. The evaluation index of the control scheme is determined, the fuzzy comprehensive evaluation method is used to evaluate the control scheme, and the optimal pressure difference control scheme is selected. The correctness and practicability of the evaluation model are verified by an example, which provides a theoretical basis and method for the energy-saving operation of the heating system. The research on optimal control of variable flow rate operation in central heating system starts late and lacks real and reliable original data and unified and standardized information base of pipe network. The fuzzy comprehensive evaluation method just makes up for the deficiency in this respect. It can not only quantify some inescapable fuzzy concepts, but also unify the subjective and objective evaluation of the system control scheme.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU995
[Abstract]:After the household metering is carried out in the heating system, the self-regulating behavior of the thermal user makes the variable flow rate of the central heating mixing water system run. The steady-state control method is not suitable when the heating system is variable flow rate. The main reason is that there is delay in the transfer of heat. This requires the system to adopt appropriate control equipment for dynamic control. The purpose of this paper is to establish a simulation model of heating system, to study the dynamic change of flow and pressure of primary and secondary networks during the operation of heating system with variable discharge, and to adopt reasonable regulation strategy and control scheme. The optimal terminal pressure difference control scheme is determined to realize the stable operation and energy saving requirements of the system. Firstly, the simulation model of the main equipment of the central heating system is analyzed, especially for the central heating pipe network, the simulation and analysis method of hydraulic condition based on the basic loop method is put forward. The computer generation method of node association matrix and loop matrix for topology structure of heat supply network is studied in this paper. The topological structure of pipe network is described by graph theory. The peak matrix describing heat source and thermal user information is introduced. A practical method of automatically generating basic correlation matrix and independent loop matrix by using peak matrix is presented. This method can simplify the calculation of the pipe network, shorten the time of the whole calculation process of the pipe network, reduce the workload and difficulty of the preparation of the original data, and provide convenience for the study of the dynamic simulation and the optimization of the regulation scheme of the heating pipe network. On the basis of this, the calculation program is compiled, and the correctness and practicability of the method are verified by an example. The simulation platform of the central heating system is established, which provides the basis for the optimal selection of the control scheme. Then, according to the household metering mixed water system, the regulation strategy and control scheme to adapt to the dynamic characteristics of heating pipe network are put forward, that is, for the actual heating system, the optimal control scheme of the end pressure difference of multi-groups of pressure difference control points and pressure differential setting values is put forward. And the time series model is used to forecast the load, and the water supply temperature of the system is determined by using the predicted load, so that the heat transfer to the thermal power stations can meet the current load demand. In this way, the effect of heat delay on heating regulation can be reduced, and the on-demand heating can be further realized. Finally, the fuzzy comprehensive evaluation method is applied to the optimization evaluation of the control scheme according to the operation characteristics of the variable discharge system of the central heating network. The necessity of using fuzzy comprehensive evaluation method to evaluate the control scheme is analyzed, and the evaluation system of the control scheme of central heating system is established. The dynamic simulation platform of central heating system is established, and the terminal pressure difference control scheme of variable flow system is deeply evaluated and studied by using an example. The evaluation index of the control scheme is determined, the fuzzy comprehensive evaluation method is used to evaluate the control scheme, and the optimal pressure difference control scheme is selected. The correctness and practicability of the evaluation model are verified by an example, which provides a theoretical basis and method for the energy-saving operation of the heating system. The research on optimal control of variable flow rate operation in central heating system starts late and lacks real and reliable original data and unified and standardized information base of pipe network. The fuzzy comprehensive evaluation method just makes up for the deficiency in this respect. It can not only quantify some inescapable fuzzy concepts, but also unify the subjective and objective evaluation of the system control scheme.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU995
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