## 5 Verification of the Simulation  
Using MATLAB2020b Simulink software, a simulation model of the hybrid plant station involved in the system's principal frequency regulation was created. In Figure 7, the model architecture is displayed. Three sets of wind turbines, each consisting of three doubly fed induction generators, an electric hydrogen production system, a group of synchronous power generators (SGs), a fixed load (L1), and an adjustable load (L2), are all included in the simulation model. To better mimic real-world settings, Figure 7 depicts three groups of wind turbines with a 7.5 MW rating operating under various wind speed conditions. The DC bus's two ends are connected to a supercapacitor. Power is produced and gathered in the AC bus as the wind turbine harnesses wind energy. The remainder of this electricity goes to the electric hydrogen production system, with a portion being boosted to power loads L1 and L2. Each wind turbine has a 2.5 MW peak power output operating at maximum capacity. After a specific margin was determined, 100 electric hydrogen production devices were ultimately chosen, taking into account the remaining capacity, preventing wind abandonment, and the device's full load. This electric hydrogen production system is connected to the AC bus using an AC/DC converter. A 100 MW synchronous generator set was added to the model to simulate the power system conditions. See Appendix C for the simulation parameters of wind turbines and synchronous generators. To make sure the model has good adaptability, a simulation analysis of hybrid plant stations under various wind speed situations is carried out. The wind turbine's output power of 0.53 MW at an input wind speed of 7 m/s is insufficient to meet grid connection requirements. while the wind turbine is operating at its 2.5 MW rated output power and the wind speed is 12 m/s. The wind speed input is thus set to 8 m/s, 10 m/s, and 12 m/s after the wind turbine's operating status was examined under various wind speed inputs. When the wind turbine is set to work under different input wind speeds and the number of switches in different electrolyzers N, the maximum system frequency drop  
Figure 7: Simulation model of a hybrid plant station. value, frequency regulation parameters of the electric hydrogen production device, and SOC reduction in the supercapacitor in a hybrid plant station with a sudden increase of 15 MW are shown in Table 2.  
Table 2 illustrates that the maximum drop value of the system frequency is 0.36 Hz, 0.34 Hz, and 0.35 Hz, respectively, when the wind speed input is 8 m/s and the N value is 5, 8, and 11, respectively. The electric hydrogen production system's maximum load reduction power is constrained, and the supercapacitors' energy deficit prevents them from contributing to frequency regulation. To improve the frequency regulation impact, a suitable N value should be chosen at low wind speeds to boost the load reduction power of electric hydrogen production. At medium and high wind speeds, the electric hydrogen production device is mainly limited by climbing power, so the N value should be increased to reduce the output of the SCESS and leave more power margin. The load power is set at a sudden increase of 15 MW. The system frequency adjustment curves of the fixed-parameter EEMD algorithm and the variable-parameter control EEMD algorithm under different input wind speeds are shown in Figures 8 and 9. The variable parameter EEMD algorithm is used, as seen in Figures 8 and 9. The highest system frequency drop values under various input wind speeds are 0.34 Hz, 0.32 Hz, and 0.315 Hz, in that order. The system's greatest frequency drop values with the fixed parameter EEMD algorithm are 0.36 Hz, 0.32 Hz, and 0.315 Hz. This is due to the limited load-reduction power of electric hydrogen production at low wind speeds. Suppose the power is distributed according to the EEMD algorithm at medium and high wind speeds.