计及回水管网热损失的电热联合系统潮流模型及算法

电力系统、热力系统联合优化运行已成为提高电力系统调峰能力及风电消纳率的有效途径之一。在详细分析热网拓扑结构及其水力、热力模型基础上,建立了计及热网回水管网热损失的热网递推模型。研究了热电机组、电锅炉等耦合元件模型,建立了电热联合系统潮流模型。通过分析热网运行方式,提出了热网潮流的前推回代计算方法。模型可方便处理多分支辐射热网及其电锅炉等能量转换装置,且计算过程中无需解算热网水力模型,无需复杂的网络编号,也不用形成导纳矩阵,具有编程简单、计算速度快等特点。实例分析表明,回水管网热损失较大,计算中不可忽略,且合理选择热源出口参数可提高电网风电消纳率。

Power Flow Model and Algorithm of Combined Power and Heat System Considering Heat Loss in Return Pipe Network

The optimized operation of combined power and heat system can effectively improve the power system peak load capacity and wind power accommodation rate. Based on the detailed analysis of the heat network topology and its hydraulic and thermal models, a recursive model of heat network is proposed to account for the heat loss in the return pipe network. The model of coupling elements such as thermoelectric generator and electric boiler are studied, and the power flow model of power and heat system is established. By analyzing the operation mode of the heat network, the forward/backward sweep method for calculating the power flow of the heat network is put forward. The model can be used to deal with multi-branch radiant heat network and its electric boiler and other energy conversion devices. There is no need to solve the heat network hydraulic model, have complex network number and form admittance matrix in the calculation process, thus the proposed model has the characteristics of simple programming and fast calculation. The analysis shows that the heat loss of the return pipe network is large and cannot be neglected, and the reasonable selection of the heat source export parameters can improve the wind power accommodation rate.