交直流电力外送通道的协调控制分析  

Coordinated Control Analysis on AC/DC Power Transmission Channel

作　　者：边宏宇[1] 郭崇军[1] 

机构地区：[1]国家电网公司华中电力调控分中心,湖北武汉430077

出　　处：《现代电力》2015年第6期36-39,共4页Modern Electric Power

摘　　要：针对高压直流大功率运行时发生换相失败、再启动等故障可能引起大量不平衡功率在送端交流电网涌动甚至造成交流电网解列的问题,对比了受端故障引起的直流故障与人工设置直流故障的影响,发现用人工设置直流两次同时换相失败代替扫描受端交流故障可兼顾安全性和可操作性。比较了定功率总和情况下直流不同功率组合故障时对送端交流断面的功率冲击,提出了用直流功率之和作为分档标准。分析了送端电网开机位置及容量对直流冲击的支持作用,提出了送端交流电网开机容量分档控制策略。应用PSASP软件分析了满足直流满功率运行对交流外送断面的约束以及保证交流外送断面能力对直流功率的需求。提出了交流断面的预控策略,在保证电网安全的基础上可提高交直流协调外送能力。In view of the problem that lots of surplus power surges in the sending Grid and the AC Grid splitting caused by the commutation failure or restart of HVDC system,influences between the DC faults caused by the sending Grid fault and artificially setting DC faults are compared,and it is found that safety and operability can both be gained by twice artificially setting DC and scanning AC fault at sending grid substituted by the commutation failure.The power impact of different power combination faults under total constant power on the AC section at sending grid is also compared,so the sum of DC power can be used as a grading standard.The impact of location and capacity of plants at sending grid on DC surge is analyzed,and grading control strategy of the capacity of plants at sending AC grid is put forward.In this paper,PSASP software is used to analyze the constraint of AC transmission section when the high voltage DC system operates with full power and the demand of the high voltage DC system to ensure the current transmission limit of AC section.Pre-control strategy is put forward for AC section to improve the coordinated AC/DC transmission capability based on the security of power grid.

关 键 词：交直流耦合 协调控制 高压直流 直流换相失败 直流再启动 

分 类 号：TM743[电气工程—电力系统及自动化]