集中供熱系統(tǒng)優(yōu)化控制方案的模糊綜合評價研究
發(fā)布時間：2019-04-15 11:35
【摘要】：供熱系統(tǒng)實行分戶計量后，熱用戶的自主調(diào)節(jié)行為使集中供熱混水系統(tǒng)變流量運行。穩(wěn)態(tài)控制方法在供熱系統(tǒng)為變流量的情況下并不適應。主要原因為熱量在傳遞過程中存在延遲。這要求系統(tǒng)必須采用適當?shù)目刂圃O備進行動態(tài)的控制。本文的目的是建立供熱系統(tǒng)仿真模型，研究供熱系統(tǒng)在變流量運行過程中，一次網(wǎng)和二次網(wǎng)的流量和壓力的動態(tài)變化，采用合理的調(diào)節(jié)策略和控制方案，確定最優(yōu)的末端壓差控制方案，實現(xiàn)系統(tǒng)的運行穩(wěn)定和節(jié)能要求。 首先，分析集中供熱系統(tǒng)主要設備的仿真模型，特別針對集中供熱管網(wǎng)，提出了基于基本回路法的水力工況模擬與分析方法，對供熱管網(wǎng)拓撲結構節(jié)點關聯(lián)矩陣和回路矩陣的計算機生成方法進行了深入的分析研究。應用圖論描述管網(wǎng)的拓撲結構，引入描述熱源和熱用戶信息的峰陣，提出了利用峰陣自動生成基本關聯(lián)矩陣和獨立回路矩陣的實用方法。該方法可以簡化管網(wǎng)計算，縮短整個管網(wǎng)計算過程的時間，減少原始數(shù)據(jù)的準備工作量和難度，為供熱管網(wǎng)的動態(tài)模擬、優(yōu)化調(diào)節(jié)的方案研究提供了方便。在此基礎上編制了計算程序，通過算例驗證了該方法的正確性和實用性。并且建立了集中供熱系統(tǒng)的仿真平臺，為控制方案的優(yōu)化選擇提供基礎。 然后，針對分戶計量混水系統(tǒng)提出適應供熱管網(wǎng)動態(tài)特性的調(diào)節(jié)策略和控制方案，即針對實際供熱系統(tǒng)，提出多組壓差控制點和壓差設定值的末端壓差優(yōu)化控制方案，并且利用時間序列模型進行負荷預測，利用預測的負荷，確定系統(tǒng)的供水溫度，使得熱量輸送到各熱力站時剛好滿足當前的負荷需求。這樣，能夠減少熱延遲給供熱調(diào)節(jié)帶來的影響，更進一步的實現(xiàn)按需供熱。 最后，針對集中供熱管網(wǎng)變流量系統(tǒng)的運行特點，將模糊綜合評價法應用于控制方案的尋優(yōu)評價。分析了采用模糊綜合評價方法評價控制方案的必要性，建立了集中供熱系統(tǒng)控制方案的評價體系。建立集中供熱系統(tǒng)的動態(tài)模擬仿真平臺，應用實例，深入的評價研究了變流量系統(tǒng)的末端壓差控制方案。確定控制方案的評價指標，采用模糊綜合評價法進行評價，選擇最優(yōu)的壓差控制方案。通過實例驗證了評價模型的正確性和實用性，，為供熱系統(tǒng)的節(jié)能運行提供了理論基礎和方法。集中供熱系統(tǒng)變流量運行的優(yōu)化控制研究起步較晚，缺乏真實可靠的原始數(shù)據(jù)以及統(tǒng)一規(guī)范的管網(wǎng)信息庫，模糊綜合評價法正好彌補了此方面的不足，它不僅能夠量化一些難以回避的模糊概念，而且能夠使對系統(tǒng)控制方案的評價主觀和客觀相統(tǒng)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.
【學位授予單位】：青島理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：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.
【學位授予單位】：青島理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU995
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