The grounding methods for multi-terminal voltage source converter based high voltage direct current( VSCHVDC) transmission system in Zhoushan were researched,and the grounding method for each converter station was determined,in which star ground reactance with neutral grounding resistor were recommended for Dinghai and Daishan converter station,while Y / Y converter transformer with neutral grounding resistor were recommended for Qushan,Yangshan and Sijiao converter station. On this basis,the overvoltage an...