介绍了±800 kV特高压直流奉贤换流站噪声控制措施。针对奉贤换流站的技术特点提出了换流变移动式Box-in降噪结构，介绍了其设计原则和设计方案，并介绍了结构设计的特点和优化方案。该方案对于今后特高压直流换流站换流变移动式Box-in降噪结构的设计有一定的借鉴意义。

This paper introduces the noise control method in Fengxian ±800 kV UHVDC converter station. Based on the technical characteristics of UHVDC converter station ,the mobile Box-in noise reduction structure is proposed , and thedesign principles and design procedure is introduced. Moreover, the structural design characteristics and its optimum solution are given as well. The solution could provide reference for future design of mobile Box-in noise reduction structure for UHVDC converter station.