An Improved Power Flow Method to Cope with Non-Smooth Constraints of Integrated Energy Systems
An Improved Power Flow Method to Cope with Non-Smooth Constraints of Integrated Energy Systems
复制标题
一种应对综合能源系统非光滑约束的改进潮流方法
DOI：
10.17775/cseejpes.2019.02950
复制
发表时间：
--
影响因子：
7.1
通讯作者：
Zifeng Zhang
中科院分区：
文献类型：
--
作者：
Yuntao Ju;Jiankai Wang;Zifeng Zhang
Abstract—Integrated energy system applications can improve energy efficiency significantly. In this paper, we establish an integrated energy system containing heat, electricity and gas. The existing power flow (PF) calculation method applied to integrated energy systems (IESs) does not consider non-smooth constraints, such as piecewise pipeline friction coefficient and generator buses reactive power limits etc.. Mixed integer nonlinear programming.(MINLP) is conventionally used to deal with piecewise pipeline friction coefficients in gas network part, but it is both complex and inefficient. Hence, we developed a piecewise linear function-based fitting method that reduced the number of integer variables and enhanced the computational efficiency. In electric network part, if the reactive power of the PV bus violates limit, it will be converted into a PQ bus which is a non-differentiable and non-smooth constraint. Mixed complementarity problem is conventionally introduced to represent the PV-PQ buses type switching relationship and is coped with by Newton-Raphson (NR) method. However, the above method is sensitive to the initial point. Here, we introduce a robust projected Levenberg-Marquardt (PLM) algorithm to cope with this issue. We demonstrated the advantages of our method and validated it both in small-scale system and large-scale network test case.
