基于能流耦合机理的热电耦合综合能源系统潮流分析及对比
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引用本文:张树森,段慧芹,周傲,代国印,毛德超.基于能流耦合机理的热电耦合综合能源系统潮流分析及对比[J].电网与清洁能源,2024,40(4):64~73
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作者单位
张树森 国网信阳供电公司 
段慧芹 国网信阳供电公司 
周傲 国网信阳供电公司 
代国印 国网信阳供电公司 
毛德超 国网信阳供电公司 
基金项目:国家重点研发计划项目(2017YFB0902100)
中文摘要:热电耦合综合能源系统对提高能源利用率、实现可持续发展具有重要意义,潮流计算作为研究稳态热电耦合综合能源系统的常用方法,能够计算出系统网络的能流分布,为后续的规划、运行、调度提供数据基础。该文基于热电耦合规律,考虑热力系统中回水热损失改进了传统热力系统模型,并结合电力系统模型组成了热电耦合综合能源系统潮流计算模型。在此基础上研究了统一求解法与分立求解法两种潮流计算方法。建立算例系统,分别采用分立求解法与统一求解法进行潮流计算,并对比分析二者的计算性能及结果。结果表明:在设定算例系统计算精度为10-2时,统一求解法与分立求解法均可满足热电耦合系统潮流计算要求。系统中电网节点功率满足基尔霍夫定律,热网由于需要工质来承载能量,在流动时产生损失时除单纯的能量损耗外还需考虑工质损失,因此回水总量少于供水总量。系统采用以热定电时,分立求解法总迭代次数为10次,耗时8.48 s,统一求解法迭代次数为8次,耗时10.56 s,考虑热网和电网的相互影响时,分立求解法迭代次数和耗时大幅增加,统一求解法基本不变,因此采用以热定电时分立求解法更加简便,在考虑热网和电网的相互影响时,适合使用统一求解法。
中文关键词:热电耦合  综合能源系统  潮流计算  统一求解法  分立求解法
 
Power Flow Analysis and Comparison of Thermoelectric Coupling Integrated Energy System Based on Energy Flow Coupling Mechanism
Abstract:The thermoelectric coupling integrated energy system is of great significance for improving energy utilization efficiency and achieving sustainable development. As a commonly used method for studying steady-state thermoelectric coupling integrated energy systems, power flow calculation can calculate the energy flow distribution of the system network, providing a data foundation for subsequent planning, operation, and regulation. Based on the law of thermoelectric coupling, this article improves the traditional thermodynamic system model by considering the heat loss of return water in the thermodynamic system and combines it with the power system model to form a power flow calculation model for the thermoelectric coupling comprehensive energy system. On this basis, two power flow calculation methods - the-unified solution method and the discrete solution method, are studied. A calculation example system is established, the discrete solution method and the unified solution method are used respectively for power flow calculation, and the computational performance and results of the two are compared and analyzed. The results show that when the calculation accuracy of the example system is set to 10-2, both the unified solution method and the discrete solution method can meet the requirements of power flow calculation for thermoelectric coupling systems. The power of the power grid nodes in the system meets Kirchhoff’s law. Due to the need for working fluids to carry energy, the heat supply network needs to consider the loss of working fluids in addition to pure energy loss during flow. Therefore, the total amount of return water is less than the total amount of water supply. When the system uses heat to determine electricity, the total number of iterations for the discrete solution method is 10, which takes 8.48 seconds, while for the unified solution method, the number of iterations is 8, which takes 10.56 seconds. When considering the mutual influence between the heating network and the power grid, the number of iterations and time consumed for the discrete solution method increase significantly while the unified solution method remains basically unchanged. Therefore, using the discrete solution method to determine electricity by heat is more convenient. When considering the mutual influence between the heating network and the power grid, the unified solution method is suitable.
keywords:thermoelectric coupling  integrated energy system  power flow calculation  the unified solution method  the discrete solution method
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