三沪直流输电工程系统调试关键技术

三沪直流工程系统调试过程中, 对主要技术问题进行了分析和解决, 如: 极Ⅰ、极Ⅱ和双极调试结合在一起, 提高了系统调试效率, 保证了系统调试按期完成; 对宜都站5631 交流滤波器不平衡保护跳闸原因进行了分析, 对其功能进行了完善; 对直流控制保护系统功能进行了完善, 包括: 直流线路保护、极母线差动保护和中性母线差动保护功能的完善, 直流线路故障测距的功能完善, 站用电辅助电源功能完善, 最后一条线路跳闸保护动作逻辑验证和完善, 直流滤波器不平衡电流保护逻辑的完善, 换流变压器分接头动作的同步性和稳定性改进等; 对系统调试计算和仿真试验研究进行了分析。这些关键技术问题的解决, 保证了系统调试的按期完成和顺利投入运行。

Key Technologies of Three Gorges-Shanghai HVDC Project System Commissioning

During the commissioning of Three Gorges-Shanghai HVDC project,major technical issues are analyzed,e.g.,combined pole 1,pole 2,and dual poles tests,which improve system test efficiency and ensure schedule;the causes of Yi-Du Station 5631 AC filter imbalanced trip are analyzed,and the functions of the filter are perfected;DC control protection system perfection technique,including DC line protection,differential bus protection and differential neutral bus protection,range detection of DC line faults,auxiliary power supply,logic validation of last line trip protection,perfecting DC filter imbalanced current protection logics,improving converter transformer tap connector synchronization and stability,etc.,are discussed;system commissioning calculation and simulation tests are analyzed.Solving these key technology issues ensures successful system test and smooth operation of the project.