Advanced HVDC Converter Applications in the Modern Power Grid

高压直流输电正变得越来越重要。发电机通常是交流发电机，大多数负载也是交流发电机。高压直流输电系统通过将交流电压转换为直流电压，然后再转换回交流电压，将这些电压连接在一起。与交流输电相比，高压直流输电降低了损耗，不要求发送端和接收端交流网络同步。因此，它被视为将可再生能源从偏远地区(如偏远的风电场)输送到遥远的负荷中心的首选方式。

High Voltage Direct Current (HVDC) transmission is growing in importance. Power generators are usually ac (alternating current) generators, and most loads are also ac. The HVDC transmission system connects these together by transforming the ac voltage to dc and then back to ac. In comparison with ac transmission, HVDC has reduced losses and does not require the sending and receiving end ac networks to be synchronized. Consequently it is seen as a preferred means to transport renewable energy from remote locations such as remote wind farms, to distant load centres.