CONTROL SYSTEM OF MULTI-TERMINAL FLEXIBLE DIRECT-CURRENT POWER TRANSMISSION SYSTEM, AND CONTROL METHOD THEREFOR

摘要

A control system of a multi-terminal flexible direct-current power transmission system, and a control method therefor. The method comprises: according to the power requirement of an alternating-current side of a converter station and the constraint conditions of a converter and a direct-current line, with the goal that the loss of the operating power of the entire multi-terminal system is minimum, calculating the optimal power flow of a direct-current network, and determining a common reference voltage of the direct-current system, a power instruction of each convertor station and a droop coefficient required by slope control. The N-1 check of the convertor station of the multi-terminal direct-current power transmission system is achieved by using same to calculate the power flow of the multi-terminal direct-current network, performing analysis, and establishing a control protection policy. The N-1 check of the direct-current line of the multi-terminal direct-current power transmission system is achieved by using same to calculate the power flow of the multi-terminal direct-current network, performing analysis, and establishing a control protection policy in advance. The control system and the control method therefor can conduct flexible and safe control on the power flow and the direct-current voltage in the multi-terminal direct-current network.