Research and Engineering Application of Power Grid Large-Scale Ice-Disaster Prevention and Treatment Technology

摘要

Ice disasters of power grid have occurred in more than 100 countries all over the world. Icedisaster is one of the biggest natural disasters posing great threat on the safe operation of power grid.Ice disaster may cause broken down of transmission lines, collapse of towers, and may even lead tosevere paralysis of large area power grid. Our research team has carried out a series of researches onthe icing of power grid ever since 1998, including icing forecasting, icing monitoring, insulatorflashover and direct-current (DC) ice-melting technology. Through revealing the “Sun-Surface-Atmosphere Coupled” icing formation rules for power grid, we have developed the first power gridicing forecast system in the world. This system has high prediction accuracy in short-term, mediumtermand long-term power grid icing forecast. Besides, we have invented the image anti-foggingmethod for monitoring conductor icing, and proposed the icing thickness intelligent identificationtechnology for the wire. Based on these technologies, we have developed the power grid icingmonitoring and decision making system. The regularity of iced insulators flashover is also revealed,and we have invented the anti-icing composite insulator, which could decrease the line icing flashoverrate by 90%. Series of DC de-icing techniques and equipments have been developed based on ourproposed core technology of “impedance flow” rectifier transformer. These equipments have lessharmonic, and can well meet the requirements of the standard with the reliability as high as 100%. Theproposed technology has been widely used on 1,023 transmission lines of 132 corporations in 8provinces in southern China, and has been applied to fight against several frozen rain and snowdisasters in 2009-2013 with accurate prediction, reliable monitoring, and high ice melting efficiency. Ithas constructed the scientific and complete supporting system for ice disaster prevention of the powergrid, and can also provide cost-effective solutions for the management of ice disasters.