Optimum Design of Converter and Circuit Breaker in High Voltage DC System

Recently, the shortage in fossil fuel causes the inflation around the world. Every nation is aware of the energy dependence on the imported oil and starts to invest on the replaceable energy such as fuel cell, solar cell and wind power. Besides of exploring more energy, cutting off the energy waste is another solution. At present, there are more digital electronics and applications of variable-frequency motors utilized at home or in office building in order to enhance the efficiency and performance. In addition, in IT industry, the amount of energy consumption in data centers is always an issue worthy to be considered. Due to the strict requirement of electricity quality, uninterruptable power system and protection facility are implemented which would result in loss in the process of electricity transmission. Therefore, with a little improvement in efficiency, considerable energy waste would be saved. (paper)