The working principle, application range, merits and demerits of internal feedback speed regulation, variable-frequency speed regulation, and hydraulic coupler speed regulation are presented, as well their applications in power plants.

• 摘要介绍火电厂电动机调速方案中的内馈式调速、变频调速、液力偶合器调速原理、适用范围和它们的优缺点，在火力发电厂的应用实例。