Research on Dynamic Simulation Method of Isolated Power Grid Stability Characteristics Considering New Energy Access

When the regional power grid and the main network connection line trip, the regional power grid passively enters the isolated power grid operation. Due to the interaction of traditional unit primary frequency modulation (PFR), new energy control protection, and frequency and voltage control devices in the isolation power grid, it is difficult for traditional simulation calculation methods to accurately derive the stability evolution process of the isolated power grid. Therefore, dynamic real-time simulation methods are needed to accurately deduce the whole process of regional power grid from networking to isolated grid operation. This paper conducts in-depth research based on the case of passive isolated grid operation of power grid in a real area. Based on the constructed all-electromagnetic transient simulation model of all elements of the actual power grid, the whole process of the operation of the isolated network is inverted, and the action characteristics of each stage of the on-site accident are completely reproduced. Based on this case, the impact of new energy access on the stability of the isolated grid is carried out, the influence of the high voltage ride-through characteristics of the wind farm on the operation of the isolated grid is analyzed, and the operation strategy of increasing the proportion of new energy is conducive to reducing the frequency peak after the regional power grid passively enters the isolated grid, and the simulation verification is carried out. Based on the above research, this paper proposes a general method for dynamic analysis of isolated grid operation considering new energy access, which can be applied to guide the operation control plan for regional power grids.