不可控12脉波整流的输电线路直流融冰研究

Study on DC De-icing Method Based on Uncontrollable 12-Pulse Rectification for Transmission Line

在覆冰输电线路的融冰方法中,与传统的交流融冰法和机械除冰法相比,直流融冰法具有所需电源容量小、高效、方便等优势。研究了采用不可控12脉波整流的直流融冰方法,分析了不可控12脉波整流直流融冰原理,在确定相应型号导线融冰电流的基础上,计算出实现导线融冰所需的融冰电压和交流侧电压,并由此确定整流变压器的额定电压比,分别推导出上下整流桥串/并联两种接线方式条件下覆冰导线的可融长度。仿真结果表明,该方法在不同型号导线的一定长度范围内具有良好的融冰效果,为解决输电线路覆冰问题提供了一种可靠技术。

In many de-icing methods for icing transmission lines, DC de-icing method has many advantages when it is compared to the traditional AC or artificial de-icing method, such as smaller power supply capacity, higher efficiency and convenience. This paper studies a DC de-icing method which is based on uncontrollable 12 pulse rectifier. It analyzes DC de-icing principle of uncontrollable 12 pulse rectification. According to the de-icing current of a given conductor, the AC side voltage and the DC de-icing voltage, which could make the ice covering on the conductor de-iced, will be calculated. Then the rated voltage ratio of rectifying transformer can be easily determined, and the icing conductor＇s de-icing range is deduced by making the two rectifier bridges connected in series and in parallel. Simulation shows that this method is really efficient to de-ice the ice covering on the transmission line in a certain range. It provides a reliable technology for solving the problem of icing transmission lines.