基于QCQP的含线损交直流混联电网经济调度模型研究  

Research on Economic Dispatch Model of AC/DC Hybrid Power Grid with Line Loss Based on QCQP

作　　者：张国强 刘航航 李智 周蕾 鲍冠南 康鹏 Zhang Guoqiang;Liu Hanghang;Li Zhi;Zhou Lei;Bao Guannan;Kang Peng(power dispatching control center of State Grid Shandong electric power company,Jinan,Shandong,250000,China)

机构地区：[1]国网山东省电力公司电力调度控制中心,山东济南250000

出　　处：《现代科学仪器》2021年第3期208-214,共7页Modern Scientific Instruments

摘　　要：为提升交直流混联电网运行效益,精细化考虑线损对发电机组调度计划的影响,提出了一种基于二次约束二次规划模型(QCQP)的含线损交直流混联电网经济调度模型。含线损的交直流混联电网经济调度模型在数学上属于非确定性难题,传统的数学规划方法难以对其准确高效求解。通过对线损项进行泰勒展开,并忽略其高次项,可将线损项转化为各变量二次幂组合的表示形式。在此基础上,利用系统潮流计算动态调整电压幅值,即可将交直流混联电网非确定性难题转化为QCQP问题,利用现有规划软件包直接求解。最后,基于改进的IEEE-30节点系统构造算例表明,所提出方法误差不超过仅6%,而其求解时间仅为传统规划方法的10%,能在保证精度的前提下提升求解效率。To enhance AC-DC hybrid power grid operation efficiency,an economic dispatch method based on quadratic constraint quadratic programming(QCQP)is put forward which takes transmission loss into consideration.The economic dispatch model for AC-DC hybrid power grid considering transmission loss is a non-deterministic polynomial(NP-Hard)problem in mathematics,which is difficult to solve accurately and efficiently by traditional mathematical programming method.The transmission loss term could be transformed into the combination representation of the second power of each variable by Taylor expansion and ignoring its higher order term.On this basis,the NP-Hard model of AC-DC hybrid power grid can be transformed into a QCQP problem by using the system power flow calculation and dynamic voltage amplitude adjustment,which can be solved directly by the existing programming software package.Finally,a case study based on the improved IEEE-30 buses system shows that the error of the proposed method is no more than 6%,while its solution time is only 10%compared to the traditional planning method,which means it can improve the solution efficiency and ensure the re suit’s accuracy.

关 键 词：交直流混联电网 经济调度 二次约束二次目标模型 线损 电压幅值 

分 类 号：TM743[电气工程—电力系统及自动化]