考虑网络动态特性与综合需求响应的综合能源系统协同优化

在综合能源系统中,利用电、热、气的互补耦合特性可以提高系统运行的灵活性.针对综合能源系统的日前优化问题,文中建立了考虑网络动态特性与综合需求响应的综合能源系统协同优化模型.首先,对热网与气网的管网动态特性进行分析,构建了多能流动态传输方程.其次,基于用户热感知的模糊性,考虑了热负荷的柔性调节能力.然后,同时考虑价格型负荷和替代型负荷,引入综合需求响应以优化次日的负荷曲线,挖掘用户侧的需求响应能力.最后,对所提模型进行了验证分析,结果表明管网的动态特性可以有效提升系统的整体灵活性,相对稳态模型而言,协同优化动态模型可以更加准确地反映系统的运行工况,保证系统运行安全.此外,仿真结果还表明考虑综合需求响应可以有效促进新能源消纳,提升系统运行的经济性.

Coordinated Optimization of Integrated Energy System Considering Dynamic Characteristics of Network and Integrated Demand Response

In the integrated energy system (IES), the flexibility of system operation can be improved by using the complementary coupling characteristics of electricity, heat and gas. For day-ahead optimization problem of the IES, a coordinated optimization model is established considering the dynamic characteristics of network and the integrated demand response (IDR). Firstly, the dynamic characteristics of pipe networks of heat and gas are analyzed, and the dynamic transmission equation of multi-energy flow is constructed. Secondly, based on the fuzziness of user thermal perception, the flexible adjustment ability of thermal loads is considered. Further, considering price type load and substitution type load at the same time, IDR is introduced to optimize the load curve of the next day, so as to mine the demand response capability on the user side. Finally, the proposed model is verified and analyzed. The results show that the dynamic characteristics of pipe networks can effectively improve the overall flexibility of the system. Compared with the steady-state model, the dynamic model of coordinated optimization can more accurately reflect the system operation condition and ensure the system operation safety. In addition, the simulation results also show that considering IDR can effectively promote the renewable energy accommodation and improve the system operation economy.