魁北克水电公司高压电网Lévis变电站的融冰装置

摘要

The De-Icer installation at Lévis substation on Hydro Québec's High Voltage System is a unique development, designed to provide two distinct functions on the transmission network. In one mode of operation it is a HVDC rectifier, providing a DC current of up to 7 200 A to melt accumulated ice on the 735 kV and 315 kV lines radiating from the station. The ±17.4 kV DC voltage generated by the De-Icer installation can be switched between different phases of the transmission lines in turn, by means of disconnects. However, ice storms are a rare event and for most of its operating life the De-leer will be re-configured to operate in another mode as an SVC, providing +250 Mvar/-125 Mvar of dynamic reactive power support onto the 735 kV transmission system. Reconfiguration between to two modes is designed to take place in less than an hour.%魁北克水电公司Lévis变电站的融冰装置是一项独特的研发成果,设计成可对输电网提供两种截然不同的功能.在一种运行模式下.它是一台HVDC整流器,给从这个变电站引出的735 kV和315 kV线路提供高达7 200A的直流电以融掉这些线路上的覆冰.该融冰装置产生的±17.4 kV直流电压可在输电线路不同相之间通过线路开关依次切换.毕竞冰暴是偶发事件.这套装置在其余大部分时间内将以另一种模式,即配置成为一台静止无功补偿器运行,给735 kV输电线路提供+250 Mvar/-125 Mvar的动态无功支持.实现这两种模式转换所需的时间不到1 h.