Summary of Trial Test of Three Gorges-Shanghai ±500 kV HVDC Transmission Project

In the two stages of the system commissioning test of Three Gorges-Shanghai HVDC Transmission Project,a total of 238 test items has been completed,including operation initialization,protective tripping,system monitoring,current control,power control,reactive power control,reduced voltage operation,auxiliary power switching,AC/DC line fault,local/remote control switching,power rise/drop,rated DC power operation,and overloaded DC operation,etc.Effects of monopolar and bipolar system trial tests on equipments and its functions are analyzed in detail.Equipment test,subsystem and station system trial test results are also analyzed and conclusions are made.Finally,conclusion to the system trial test is given.