Successfully developing ±1000kV and below converter applied in UHV DC and HVDC power transmission projects, DC Control &Protection System, forming a complete set of solution service capabilities including feasibility study，system design, core equipment research and development, production test、installation and commissioning , maintenance guarantee，project management, quality management basing on DC converter valves, water cooling equipment and valve control protection equipment； the core technology application level is in a leading position in China, and widely used in large power grid interconnection and long-distance high-power transmission. Undertaking 33 projects having been built or under construction.