This paper deals with the inclusion of VSC-HVdc transmission schemes into stability-type simulations by hybrid methods. These methods allow selected parts of the network to be simulated in detail by including electro-magnetic behaviour of devices and network elements whereas the remainder of the network is simulated in a simplified fashion with emphasis on electro-mechanical interactions. The paper discusses the interface methods needed for coupling both simulations, and presents a simple but robust interface, particularly designed for VSCs. Several aspects that determine the performance of the hybrid simulation are discussed and tested by simulations on an example network. The hybrid simulations have been implemented in Matlab and verified against a full EMT-type simulation in PSS®NETOMAC.