With the large-scale integration of a high proportion of renewable energy and power electronic equipment, the share of traditional synchronous generators in the system has significantly decreased. This leads to power systems operating with low inertia and weak damping characteristics, posing challenges to system stability. The Grid-forming energy storage power conversion system (PCS) autonomously establishes and regulates the voltage and frequency, as it can operate without relying on a Phase-Locked Loop, which is a critical component for traditional grid-following inverters. This paper models an energy storage converter based on the neutral-point clamped (NPC) converter topology, designs the virtual synchronous generator (VSG) control strategy along with its parameter tuning, and finally validates the accuracy of the model and the effectiveness of the control strategy through MATLAB/Simulink.