A self-adaptive AC algorithm to AC/DC Power Flow in Integrated Energy System

This paper provides a self-adaptive AC algorithm for an AC/DC hybrid network in the integrated energy system. Firstly, a transformed mechanism is designed to the network model in a DC system to that in an AC system so that the calculation can be done in an integrated AC framework without changing the relationships between different parameters and variables of a DC system. On this ground, a line commutated converter (LCC) and a voltage source converter (VSC) are uniform to model as the T-shaped circuit with the self-adaptive mechanism according to their external characteristics. An AC algorithm for solving AC/DC hybrid power flow is developed, performing much more efficiently than the existing unified method due to the convergent feature of the Newton Raphson method. Finally, AC/DC hybrid systems are studied to verify the proposed methodology for its performance and feasibility.