摘要
网格式交直流混联配电网传统潮流计算中,电压源变换器VSC(voltage source converter)虚拟节点C的电压及功率参考值对换流站损耗有重要影响,优化此参考值可以有效降低换流站的损耗。本文提出以换流站损耗最小和直流电压偏差最小为目标函数的最优潮流优化方法,并建立了换流站损耗数学模型。利用遗传算法与Newton-Raphson法相结合,并将Newton-Raphson法中不平衡量作为等式约束,寻优VSC的参考电压和参考功率,继而合理分配潮流,最终得到网络潮流和损耗。在含有20节点10个VSC的交直流混联网络中的计算结果表明,采用遗传算法寻优后,换流站损耗明显减小。
In the traditional power flow calculation of a meshed AC-DC hybrid distribution network,the reference values of voltage and power at the voltage source converter(VSC)virtual node C have important influences on the converter station loss.Therefore,the optimized reference values can effectively reduce this loss.In this paper,a power flow optimi zation method is proposed,which takes the minimum loss of the converter station and the minimum deviation from DC voltage as its objective function.In addition,a mathematical model for the converter station loss is established.The ge netic algorithm(GA)is combined with the Newton-Raphson method,and the unbalanced quantity obtained by the latter is taken as the equality constraint.The reference voltage and reference power of VSC are optimized,and then the power flow is reasonably distributed.Finally,the network power flow and loss are obtained.The calculation results of an AC/DC hybrid network containing 20 nodes and 10 VSCs show that the converter station loss is significantly reduced owing to the use of GA in the optimization process.
作者
朱奇先
朱玉鑫
王晓兰
张璐
ZHU Qixian;ZHU Yuxin;WANG Xiaolan;ZHANG Lu(State Key Laboratory of Large Electric Drive Systems and Equipment Technology,Tianshui 741000,China;Gansu Provincial Key Laboratory of Advanced Industrial Process Control,Lanzhou 730050,China;College of Electrical and Information Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2020年第3期39-45,共7页
Proceedings of the CSU-EPSA
基金
大型电气传动系统与装备技术国家重点实验室开放基金资助项目(SKLLDJ032017002)。
