Interior-point Optimal Power Flow With the High Voltage Direct Current Transmission System

An optimal power flow(OPF) algorithm based on the superposition principle and automatic differentiation(AD) considering high voltage direct current(HVDC) devices is introduced.New features of the proposed algorithm are the following:The algorithm utilizes the power injection model,makes the HVDC integrated into the interior-point OPF by using the superposition principle to deal with the HVDC,and employs AD to modify elements in Jacobian and Hessian matrices,which are used in the interior-point method with high efficiency.Only minor modification for the existing OPF code is required to enhance the original program,so as to support HVDC devices,with both maintainability and generality improved.Several test cases indicate that the proposed algorithm retain high performance of the tranditional interior-point OPF and can be extended to FACTS devices and other user-defined models.