AC-DC Decoupling Algorithm of Optimal Power Flow with HVDC System

To calculate optimal power flow (OPF) with high voltage direct current (HVDC) system, AC-DC system variables are used to be optimized together. Since there are many HVDC variables, more formula derivation and coding of Jacobi matrix and Hessian Matrix are needed in the calculation. Considering DC system characteristic of OPF with HVDC system, a method of alternative iteration of AC-DC system is presented in this paper, which could take advantage of the existing AC system OPF program and extend to calculate OPF with HVDC system. Simulation and comparison results indicate that, the OPF calculating method of alternative iteration of AC-DC system presented in this paper has good convergence, strong adaptability and high accuracy