Power limitations of the HVDC Transmission Power System

The scope of the presented paper is concentrated on two terminal HVDC transmission system. The intention of the paper is to present a precise insight into the limitations of the transmitted power of a HVDC system incorporated in real AC power system. The paper demonstrates the impacts of the combined AC/DC system model parameters on the transmitted power through the DC link. Also, in this paper an efficient AC/DC load flow method is developed. This method accommodates perfectly the various types of HVDC system control modes. In addition, the switching between these control modes can be done easily in the developed AC/DC load flow method. Moreover, this method is considered a reliable computational tool used to evaluate the limitations of the HVDC transmission system power. Then, the effectiveness of the developed AC/DC load flow method and the influence of the system parameters on the capability of the HVDC transmission system are investigated on a test system composed of two parallel HVDC/AC lines incorporated in AC power system. Key-Words: HVDC, modelling, ac/dc load flow, dc power