Abstract: In view of the problem of power coordinated control among the converter stations in the    voltage source converter multi-terminal direct current （VSC-MTDC） system with new energy connected to the grid， a coordinated control strategy for VSC-MTDC system is proposed. The strategy combines master-slave control with droop control. Firstly， the active power of the main converter station with constant direct current （DC） voltage is shared by several converter stations， which makes it difficult for the main converter station to reach full load. It coordinates the active power capacity of several converter stations， especially for the frequent and intermittent changes of power output when new energy is connected to the grid. When the main converter station is full load or exit operation， the rest of the unbalanced power is borne by the converter stations with adaptive droop control. Adaptive droop control is based on the power margin of the converter stations to distribute the unbalanced power in the system， making it difficult for the converter stations to reach full load. The error of DC voltage between several converter stations is considered. By adjusting the DC voltage limit values， the active power capacity of the converter stations can be used as much as possible， and the DC voltage stability can be maintained. Simulation results verify the feasibility and effectiveness of the proposed control strategy.

Key words: gird integration of new energy, voltage source converter multi-terminal direct current （VSC-MTDC）, adaptive droop control, power margin, adjust direct current voltage limit values of , converter stations