Research on hybrid HVDC

Based on analysis of the development, technology characteristics and application scope of conventional HVDC and voltage source converter based HVDC (VSC-HVDC), an alternative form of HVDC transmission, named hybrid HVDC, is presented in this paper. At first the fundamental principle and technology characteristics of hybrid HVDC are analyzed, then the simulation model is founded based on simulation software PSCAD/EMTDC. Simulation results show that the proposed hybrid HVDC system can be operated steadily. Further more when two AC sides have single phase to ground or three phases short circuit fault in short time it has the capability to restore steadily and rapidly. At last the advantages and disadvantages of the hybrid HVDC and its application foreground are evaluated.