An Improved Power Flow Method to Cope with Non-smooth Constraints of Integrated Energy Systems  

作　　者：Yuntao Ju Jiankai Wang Zifeng Zhang 

机构地区：[1]College of Information and Electrical Engineering,China Agricultural University,Beijing 100083,China

出　　处：《CSEE Journal of Power and Energy Systems》2022年第6期1784-1793,共10页中国电机工程学会电力与能源系统学报（英文）

基　　金：supported in part by the National Natural Science Foundation of China under Grant No.51707196.

摘　　要：Integrated energy system applications can significantly improve energy efficiency.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 the 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 parts,but it is both complex and inefficient.Hence,we develop a piecewise linear function-based fitting method that can reduce the number of integer variables and enhanced the computational efficiency.In the electric network part,if the reactive power of the PV bus violates limits,it will be converted into a PQ bus,which is a non-differentiable and non-smooth constraint.Mixed complementarity problems are conventionally introduced to represent the PV-PQ buses type switching relationship and are addressed by the 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 demonstrate the advantages of our method and validate it both in a small-scale system and largescale network test cases.

关 键 词：Complementarity constraints integrated energy system non-smooth constraints piecewise linear function-based fitting method 

分 类 号：TK01[动力工程及工程热物理] TM73[电气工程—电力系统及自动化]