特高压直流在线融冰技术及其工程应用

Online ice melting technology for ultra high voltage direct current system and its engineering application

雅湖直流线路跨越数个易发覆冰灾害的区域,易出现线路覆冰现象,影响直流输电稳定性。为解决上述问题,本文研究设计特高压直流融冰功能。首先,分析融冰主接线隔离开关的配置情况,避免运维人员人工搭线的操作过程;其次,设计融冰隔离开关的顺控及联锁逻辑,保障运维人员安全、快速地进行运行方式的转换;再次,阐述融冰的基本控制策略及在线融冰技术,保证常规运行转入融冰运行时,功率输送不中断;最后,介绍融冰配置的特殊功能,降低融冰运行异常对系统的影响。通过实时数字仿真试验验证了在线融冰技术的有效性,并一次性成功通过了现场解锁、功率升降、闭锁试验。融冰功能的研究设计提高了雅湖直流线路在冰雪灾害天气下的输电可靠性。

The Yahu DC line spans several areas prone to icing disasters,which can easily lead to line icing and affect the stability of DC transmission.In order to solve these issues,the ultra-high voltage direct current ice melting function has been studied and designed.Firstly,a systematic analysis is conducted on the configuration of the isolation switch for the main wiring of the ice melting system,to avoid manual wiring operations by operation and maintenance personnel.Secondly,the sequence control and interlocking logic of the ice melting isolation switch is designed to ensure the safety and fast operation mode switching for the operation and maintenance personnel.Once again,the basic control strategy of ice melting and online ice melting technology are introduced to ensure uninterrupted power transmission when transitioning from conventional operation to ice melting operation.Finally,the special functions for ice melting configuration are produced to reduce the impact of abnormal ice melting operation on the system.The effectiveness of online ice melting technology are verified through real-time digital simulation experiments,and it successfully passes on-site deblocking,power lifting,and blocking tests one time.The research and design of ice melting function can improve the transmission reliability of Yahu DC line in ice and snow disaster weather.