Redefine Resilience Engineering:Based on Progress of Debugging and Checking Technology in HVDC Projects of CSG

High Voltage Direct Current(HVDC) transmission projects has been playing crucial role in China Southern Power Grid. These projects transmit the numerous hydro electricity from Yunnan to Guangdong and Guangxi. Keeping these HVDC projects stabilized operating is important to the whole power grid. Different from Alternate Current(AC) transmission projects, 78% of debugging and checking work for HVDC devices is proceeding before being service as estimated. Currently about 65% electricity from western to eastern of China Southern Power Grid(CSG) is transmitted by HVDC devices. So generally speaking, the safety and reliability of half electricity from western to eastern of CSG is checking during this short period before being service. Until 2020,there are 10 HVDC channels transmitting hydro power to the eastern area in CSG. Meanwhile there are great progress in debugging and checking work for HVDC projects to keep the device and grid stable and reliable. Referring the resilience engineering, the STAMP and so other famous concepts about industrial safety, the paper illustrated the attribution method for safety, demonstrated that how to diminish the unknown risk and how to prove the efficiency is the core of resilience engineering. After that the paper divided the work of HVDC projects into 3 systems: devices system, power grid system and human factor system, summarized the principles for each system, and presented the concept of redefining the resilience engineering to the HVDC projects safety and stable. Based on the principles concluded, the paper presented the redefined resilience engineering as enough and comparable visibility, multiple controlling methods and prevention of unknown risk.