System and method for determining transient overvoltage of sending end of multi-direct-current sending-out system

The invention discloses a system for determining transient overvoltage of a sending end of a multi-direct-current sending-out system, and the system comprises: a parameter obtaining module which is used for obtaining the active power and reactive power of each direct current of the multi-direct-current sending-out system, the port alternating-current voltage of each direct current, the self impedance of each direct current, and the mutual impedance between any two direct-current nodes; a transient overvoltage calculation module which is used for calculating the transient voltage rise of each DC sending end according to the parameters acquired by the parameter acquisition module and determining the transient overvoltage of each direct-current sending end according to the transient voltage rise and the port alternating-current voltage. The demand problem of a theoretical calculation method for the transient overvoltage of the sending ends of the multi-direct-current sending-out system issolved. 本发明公开了一种确定多直流送出系