The present status for HVDC converter station is presented, and its future development trends are discussed in several aspects such as power electronic components, active filters, optical direct current transducer, control and protection system, mode of connection, etc. 在介绍高压直流换流站技术现状基础上,从电力电子器件、有源滤波器、光电流传感器、控制和保护系统、接线方式等几方面,探讨换流站技术的发展趋势。
DNC ( Direct Numerical Control or Distributed Numerical Control) oriented to networked manufacturing ( NetWorked_DNC) has become a major mode of numerical control information integration and equipment integration, which provides an effective method for NC machine connection, NC code transmitting and NC resource sharing. 网络化制造下的DNC(NetWorkedDNC)系统成为一种实现数控信息集成和设备集成的主要形式,为我国串行接口数控机床的联网、数控程序传输以及数控资源网络共享提供了有效的解决方法。
The enterprise group is the client base that has direct or indirect control relations, or the composition of other important connection sides. 企业集团是指相互之间存在直接或间接的控制关系,或其他重大影响关系的关联方组成的客户群。
Direct torque control ( DTC) in delta-connection and star-connection machine is researched and compared. The advantages and disadvantages of start about two connection are compared. 深入研究比较了三角形连接与星形连接的电机中直接转矩控制的异同,比较了两种连接方法起动的优缺点。