变频器新应用——变速抽水蓄能水电机组

New Applications of Frequency Converters——Variable Speed Pumped-storage Hydropower Facilities

抽水发电机组是既能抽水又能发电的水电装备,主要用于抽水蓄能电站,也用于调水工程,常规机组恒速运行。为提高电能调控的快速性和灵活性,扩展水轮机运行范围和提高效率,随着变频技术发展,越来越多的机组改为变速运行。介绍了变速运行的优点以及两种变速方案和它们的变频器,阐述了两种变速运行的控制策略。

Pump-turbine units are kind of hydropower facilities with both pump and power generation abilities,they are used mainly in pumped-storage plants and also in water-managing projects. Conventional units operate with fixed-speed. To make power control quick and flexible and to extend operation ranges of turbines as well as improve their efficiency,more and more units change to variable-speed operations following the development of frequency converters. Benefits of variable speed operations,two solutions and their frequency converters as well as control schemes for realizing variablespeed were introduced.