基于功率下垂节点与两步式分析的扩展潮流计算模型  

An Extended Power Flow Calculation Model Based on Power Droop Bus and Two-Step Analysis

作　　者：冯卓诚 姜彤 万凯遥 李勤新 Feng Zhuocheng;Jiang Tong;Wan Kaiyao;Li Qinxin(State Key Laboratory of Alternative Electrical Power System with Renewable Energy Sources North China Electric Power University,Beijing,102206,China;China Electric Power Research Institute,Beijing,100192,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]中国电力科学研究院有限公司,北京100192

出　　处：《电工技术学报》2023年第9期2335-2349,共15页Transactions of China Electrotechnical Society

基　　金：中国电科院创新基金资助项目(XT83-21-003)。

摘　　要：为实现大电网潮流计算无解时的可靠调整,提出一种基于功率下垂节点与两步式分析的扩展潮流计算模型。首先定义功率下垂节点并讨论其在不同场景下对潮流收敛性的影响;给出考虑功率下垂节点的扩展潮流计算模型的定义式,并通过简单算例验证模型恢复潮流可解性的有效性;为确定节点转换逻辑,提出两步式分析方法,将网络划分为PQ子网与PV子网,从电压与功角两个角度来确定需要进行类型转换的节点;进行状态回溯计算,通过回溯点处的左特征向量确定动作发电机,并确定调整方案。在IEEE 118节点系统与TEXAS 2000节点系统进行仿真,并与基于内点法的最优潮流(OPF)法等多种方法进行对比,验证所提策略的有效性与优越性。Power flow calculation(PFC)is the basis of power system analysis.Ensuring the convergence of power flow plays an important role in the planning and operation of power network.Mathematically,the essence of PFC is to solve nonlinear equations,whose convergence is influenced by many factors.When improper initial value selection and unreasonable mode arrangement occur,the PFC cannot converge.The non-convergence of PFC indicates that the equation has no solution or the equation has solution but cannot be obtained due to the limitations of the solving algorithm.If the solution exists,a robust pathological power flow algorithm should be used to find the flow solution.Otherwise,the boundary conditions of power flow equations should be changed and the operating mode should be adjusted to make the power flow equations solvable and find the solution.At present,the main method of power flow adjustment is expert experience,which consumes a lot of human resources and requires a large amount of calculation.Therefore,an efficient and stable power flow adjustment strategy is urgently needed to ensure the reliable convergence of power flow.To address these issues,this paper proposed an extended power flow calculation model based on power droop bus and two-step analysis.Firstly,the power droop bus is defined to restore power flow solvability.The principle of restoring power flow solvability by bus type conversion is to intersect the characteristic curve of the converted bus with the original solvable domain manifold.The boundary of the solvable domain is composed of saddle node bifurcation(SNB)points,which is a closed curve containing the origin.According to the definition of power droop bus,the new manifold will pass through the origin of the coordinate system,and the new manifold will still pass through the original feasible region,which explains its effectiveness towards restoring solvability.An extended power flow calculation model considering power droop buses is given.The extended system is developed to restore power flow sol

关 键 词：潮流无解 潮流调整 潮流薄弱点 节点类型转换 

分 类 号：TM74[电气工程—电力系统及自动化]