The multi-functional grid simulation device independently developed by Hopewind can not only accurately simulate the three-phase three-wire grid systems with different voltages and frequencies as well as their dynamic disturbance characteristics, but also simulate high-voltage, low-voltage and other fault characteristics of various power grids, including fault states with symmetric and asymmetric change. It can be widely used for the grid adaptability test, power quality test, primary frequency modulation test and fault voltage ride-through test of test equipment such as the wind power generation system, PV power generation system, energy storage system, SVG, etc.