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综合能源系统多能流准稳态分析与计算
钟俊杰, 李勇, 曾子龙, 曹一家
湖南大学 电气与信息工程学院,湖南 长沙 410082
摘要:
多能流计算及互动分析是综合能源系统的重要基础,分析多能流交互机制,建立由电、气、热网和耦合元件组成的综合能源系统模型,提出针对多能流计算的分解法和统一法的求解框架和求解方法。针对目前基于牛顿法的多能流算法对初值较为敏感的不足,提出基于自适应步长因子的改进统一法,对比分析3种算法的准确性、收敛性和收敛时间。考虑扰动后的过渡过程和网络间的多时间尺度特性,将综合能源系统交互过程划分为4个准稳态阶段,分析基于准稳态多能流的交互作用。最后,基于一个双向耦合的综合能源系统,以电网支路开断为例对系统进行分析,验证了所提算法和准稳态分析的有效性。
关键词:  综合能源系统  多能流  改进统一法  互动分析  准稳态分析
DOI:10.16081/j.epae.201908010
分类号:TM73
基金项目:111引智计划(B17016);国家自然科学基金资助项目(51520105011,51607011) ;长沙优秀青年创新项目(KQ170-7003)
Quasi-steady-state analysis and calculation of multi-energy flow for integrated energy system
ZHONG Junjie, LI Yong, ZENG Zilong, CAO Yijia
College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Abstract:
The multi-energy flow calculation and interaction analysis are essential tools for an integrated energy system. The multi-energy flow interaction mechanism is formulated, and an integrated energy system model that consists of electricity, gas, heat networks and coupling units is established. Subsequently, the solution framework and method based on both decomposition and unified approaches are designed for multi-energy flow calculation. Moreover, to address the issue that the multi-energy flow algorithm using Newton’s method is more or less sensitive to initial values, an improved unified approach that utilizes an adaptive step length factor is proposed. Meanwhile, the accuracy, convergence and computational efficiency of the three algorithms are compared. Considering the transition process after disturbance and multi-time scale characteristics of multi-energy networks, the interaction process are divided into four quasi-steady-state stages and the interaction based on quasi-steady-state multi-energy flow is analyzed. Finally, a bidirectional integrated energy system is employed as an example with the consideration of the outage of a line. Numerical results on this system verify the effectiveness of the proposed approach and quasi-steady-state analysis.
Key words:  integrated energy system  multi-energy flow  improved unified approach  interaction analysis  quasi-steady-state analysis

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