Abstract: New power systems are characterized by the ubiquitous presence of power electronic converters. The active support control of the converter plays a crucial role in ensuring the stable operation of the system and has become a hot topic in current academic and industrial circles. In this paper, based on the analysis of the typical active-support control strategy and its shortcomings, a new control scheme based on potential vector remodeling (PVR) is proposed for a system strength supported flexible converter (SSS FC). It has the advantages of easy parameter setting, simple current limiting strategy, controllable short-circuit current, flexible power regulation, etc. Based on the user-defined function of the power system analysis software package PSASP-UD, the SSS FC structural electromechanical transient simulation model and the strategy of participating in the multi-form stability control of the power grid are established. The effectiveness of SSS FC multi-function stability control is verified for both the CEPRI-36 node standard test system and a large AC/DC hybrid power grid.