The convergence analysis of the AC/MTDC system power flow

The AC/MTDC system can be divided into two subsystems, the master for the AC subsystem and the slave for the multiterminal DC (MTDC) subsystem. Based on the master-slave-splitting theory, the convergence of different AC/MTDC power flow algorithms, such as the simultaneous method, sequential method and load equivalent method, has been analyzed comprehensively. Then, in order to utilize the traditional AC power flow method, such as the fast decoupled method, this paper proposes a novel approach-part-load equivalent method, which considers the convergence and adaptability electrically. Numerical tests have been done and the results verify the validness and effectiveness of the proposed method