分裂导线阻抗调节防冰及融冰方法

Anti-icing and De-icing Method of Line Impedance Regulation of Bundled Conductor

目前广泛应用的输电线路交、直流融冰方法已不能满足当前电网安全性、可靠性的要求以及智能电网的发展。使用分裂导线的阻抗调节来实现其自身的防冰或者融冰,具有实时性和不断电作业等优点,是一种非常有前景的输电线路覆冰防御方法。即对阻抗调节应用于输电线路防冰、融冰的具体方法进行了研究。根据分裂导线阻抗调节的功能和特点,首先对使用该方法进行线路防冰、融冰的基本原理和要求进行了论述,同时也引出了需要计算的关键参数:对于防冰方法主要是解决最大间隔时间和最小负荷电流的计算问题,对于融冰方法主要是进行融冰时间的简化计算;然后在此基础之上,推导得出使用阻抗调节进行防冰、融冰的具体方法,包括子导线导通数目的选择及其导通时间的确定。在多功能人工气候室内进行了防冰和融冰的模拟试验,试验结果表明对防冰、融冰方法的计算是合理的。为分裂导线阻抗调节方法在防冰、融冰方面的应用提供了一种借鉴方案。

Ice melting of transmission line with AC or DC widely adopted at present cannot adapt well to development of power grid in security, reliability and intelligentization. Anti-icing and de-icing with line impedance regulation, which can be operated in real time without disconnection of line sections to be de-iced, is a very promising technology in protecting lines from icing disaster. This paper makes a special study on concrete application method in anti-icing and de-icing with line impedance regulation. For both anti-icing and de-icing methods, their rationale is illustrated with characteristics of impedance regulation for bundled conductor; the key parameters, i.e. maximum interval time, minimum load current for anti-icing and ice-melting time for de-icing, are calculated. On this basis, specific method of anti-icing and de-icing of line impedance simulation is obtained, including determination of number of conducting subconductors and their conducting time. Anti-icing and de-icing of this method are validated preliminarily with laboratory investigation conducted in artificial climate chamber. The results of this research can be employed to line impedance regulation in anti-icing and de-icing in practical engineering as a reference.