基于二阶锥切负荷模型的大规模交直流混联电网可靠性评估  

Reliability Evaluation of Large-scale Hybrid AC/DC Grids Based on SOCP Load Shedding Model

作　　者：谢海鹏[1] 何剑[2] 别朝红[1] 云雷[2] 易俊[2] 汤涌[2] 

机构地区：[1]电力设备电气绝缘国家重点实验室陕西省智能电网重点实验室(西安交通大学),陕西省西安市710049 [2]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2016年第12期3761-3767,共7页Power System Technology

基　　金：国家电网公司科技项目(XT71-15-001)~~

摘　　要：针对大规模交直流混联电网可靠性评估难以兼顾精确性和快速性的问题,基于二阶锥规划的切负荷模型和蒙特卡洛法,实现了大规模交直流混联电网可靠性快速评估。首先,建立换流站的线性稳态模型和交直流混联电网中各元件的可靠性模型。然后,统筹考虑交流系统和换流站中有功功率和无功功率以刻画交、直流系统的相互影响,提出基于二阶锥规划的最优切负荷模型。在此基础上,基于蒙特卡洛法提出大规模交直流混联电网可靠性评估流程。最后,以修改的两区域IEEE RTS-96测试系统为算例进行可靠性分析,验证了所提模型和方法的有效性,结果显示,不考虑交、直流系统的相互影响得到的可靠性指标过于乐观,在大规模交直流混联电网的可靠性评估中十分有必要计及交、直流系统的相互影响。Hybrid AC/DC grids are developing steadily in China. With increasing proportion, their reliability brings greater impact on planning and operation of power systems. Aiming to evaluate reliability of large-scale hybrid AC/DC grids accurately and efficiently, a reliability evaluation method is proposed based on SOCP load shedding model and Monte Carlo simulation. Linear steady-state models of converters and reliability models of individual components in hybrid AC/DC grids are presented. With both active and reactive power in AC systems and converters considered, an optimal load shedding model based on SOCP is proposed. In a case study, the proposed reliability evaluation method is applied in a modified two-area IEEE RTS-96 test system to verify its effectiveness. Numerical tests show that reliability results would be underestimated if not considering impact of hybrid AC/DC system. The proposed method is suitable for practical application in large-scale hybrid AC/DC grid.

关 键 词：交直流混联电网 二阶锥规划 可靠性评估 最优切负荷模型 

分 类 号：TM71[电气工程—电力系统及自动化]