This paper takes the multi-energy microgrid, an important part of the grid regulation capability, as the entry point, and designs the energy input model and the energy interaction model successively based on the storage mode of the multi-energy microgrid supply. The two models are used to analyze the energy conversion and input-output relationship between energy sources, and to establish a multi-energy microgrid power regulation model. Subsequently, the inertia change rate index is proposed to analyze and extract the time-varying characteristics of the inertia of the new energy grid system as a method to judge the trend of the inertia level change of the grid system. At the same time, considering that the grid system needs to consume the adjustable resource participation capacity to deal with internal operation problems, the evaluation method of external participation capacity is built by partitioning the grid into networks. Combining the above, an assessment method of the supply and demand risk adjustment capacity of the provincial grid system with high proportion of new energy is formed. The method is used to analyze the regulating ability of energy storage units in the grid system, and further proposes four indicators for assessing the potential regulating ability of the grid system: outputable power (Eout), inputable power (Ein), maximum abandoned power (Eg), and maximum load shedding power (EL). Based on the four assessment indexes, the assessment method in this paper calculates the difference between the theoretically calculated value of the outputable power (Eout) and the inputable power (Ein) and the simulation results are less than or equal to 0.00 as a negative value in simulation experiments, which verifies that the theoretical value is that the microgrid can be ensured to provide or absorb power to the outside world in the next cycle.
