基于多目标优化的电网直流承载规模评估方法  

Assessment of DC Load-carrying Capacity of Power Grid Based on Multiple-objective Optimization

作　　者：李华取 彭晓涛[1] 覃琴 姚良忠 张健 郭强 LI Huaqu;PENG Xiaotao;QIN Qin;YAO Liangzhong;ZHANG Jian;GUO Qiang(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430000,Hubei Province,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China)

机构地区：[1]武汉大学电气与自动化学院,湖北省武汉市430000 [2]中国电力科学研究院有限公司,北京市海淀区100192

出　　处：《电网技术》2021年第8期3115-3124,共10页Power System Technology

基　　金：国家电网公司科技项目(电网承载直流规模及演化规律研究)。

摘　　要：合理评估受端电网的多馈入直流承载规模,对指导电网建设和维持电网安全稳定具有重要意义。考虑直流落点、机组出力分配、无功补偿对受端电网直流承载规模的影响,在分析广义有效短路比可量化节点电压对直流馈入支撑强度的基础上,采用广义有效短路比指标、暂态电压支撑强度指标及网损指标和发电机成本费用指标,以及考虑受端电网安全运行的多约束条件建立联合优化直流落点和机组出力分配的模型,基于利用循环递增直流馈入容量和重复求解优化模型获取满足约束条件的优化解集,以及对解集按逆序进行安全校验的方式,提出了基于多目标优化评估受端电网最大直流承载规模的方法。在此基础上,进一步建立基于多目标优化无功补偿增加最大直流承载规模的方法。最后以IEEE 39节点系统和河南规划电网作为多馈入直流受端电网进行仿真分析,验证了所提受端电网最大直流承载规模分析方法的可行性和有效性。Reasonably evaluating the multi-feed-in DC carrying scale of the receiving grid is of great significance in guiding grid construction and maintaining grid security and stability.Considering the influence of DC impact point,unit output distribution and reactive power compensation on the DC bearing capacity of receiving end power grid,the generalized effective short-circuit ratio to quantify the strength of node voltage support to the DC feed-in is analyzed.Next,the model for implementing the combined optimization of both the DC drop point and the generator output distribution is established based on using the generalized effective short-circuit ratio index,transient voltage support strength index,network loss index and cost index of generator,and the multiple constraints considering the safe operation of the receiving grid.Then,the method for accessing the maximum DC load-carrying capacity of the receiving grid based on multi-objective optimization is proposed,which acquires the result of the maximum DC load-carrying capacity by using the cyclic incremental DC feed-in capacity and the repetitive solution optimization model to obtain the optimized solution set that satisfies the constraint conditions,as well as the safety check of the solution set in reverse order.On this basis,the method to increase the maximum DC load-carrying capacity based on multi-objective optimized reactive power compensation is further proposed.Finally,the IEEE 39-node system and Henan province planning power grid are used as a multi-fed DC receiving grid for simulation analysis,which verifies the feasibility and validity of the proposed method for analyzing the maximum DC load-carrying capacity of the receiving grid.

关 键 词：短路比 直流落点优化 机组出力优化 直流承载规模 无功优化 

分 类 号：TM721[电气工程—电力系统及自动化]