The large-high voltage direct current (HVDC) systems requires solving a number of complex tasks aimed at ensuring the reliability and stability of new combined HVDC/AC systems, as well as the development of their control and protection, and analysis of the mutual influence of HVDC and HVAC components. However the analysis of research results obtained from a worldwide shows that more comprehensive simulation tools are necessary to allow this. This paper presents the hybrid simulation technology and approach allowing synthesizing hybrid models of power equipment, including the elements of HVDC systems, which aim is to maximally meet modern requirements for modeling and simulation tools. The results of the application of the hybrid approach for development of the models of HVDC systems based on different types of converters, as well as the results of experimental research intended to prove models' capabilities are given in the paper.