Power high-density DC/DC conversion system with overvoltage protection for energy transmission by umbilical cables connected to robotic systems in long pipelines

A power high-density DC/DC conversion system with overvoltage protection, comprising:

• a surface source;
• an umbilical cable;
• an overvoltage protection circuit;
• and
• a two-stage conversion modular system comprising an unregulated first conversion module and a regulated second conversion module, wherein the first conversion module is configured to lower input voltage from between 630 V and 700 V to a lower unregulated bus voltage between 36 V and 42 V, and the second conversion module is configured to convert the lower unregulated bus voltage to a regulated bus output voltage,
• wherein the first conversion module and the second conversion module are connected in series, and wherein inputs of conversion modules within the first conversion module are connected in parallel, and conversion modules within the second conversion module are connected in parallel, to increase maximum processed power.