论述了我国大功率交交（AC-AC）变频调速技术的研究和国产化装备的研制工程，丰富并完善了大功率交流调速理论，形成了自主创新的核心技术，解决了大功率交流调速装备的多项关键技术，推动国产交流调速装备步入国际先进行列，立足工程，取得显著的经济效益和社会效益；并介绍了我国第一套7.5 MVA三电平IGCT交直交（AC-DC-AC）变频调速系统的研制，该变频器结构紧凑、性能良好、运行可靠，达到国际先进水平。

In this paper, the development status of the domestic large power AC motor variable frequency speed regulation technology is introduced. The domestic large power AC drivers fed by cycloconverters have been greatly developed, and some innovation on the theory and engineering technique has been realized. They have been applied to rolling mill, mine winder and so on, and remarkable economic and social benefit has been achieved. The development of the first domestic 7.5 MVA IGCT AC-DC (direct current)-AC converter is also introduced. This converter has excellent performance and reliable operation, and it has been used in traction.