## 5 Verification of the Simulation
In that case, the electric hydrogen production device cannot assume the frequency regulation power instruction, resulting in a poor frequency regulation effect. The relevant parameters of the EEMD algorithm should be adjusted under different wind speeds to reasonably allocate the frequency regulation power instructions for electric hydrogen production and supercapacitors. Following is the selection of the ideal number of switches for electric hydrogen production using the variable parameter control strategy of the proposed EEMD algorithm. The main frequency regulation of a hybrid plant station is simulated and examined while taking into account various wind speed input conditions and the wind power plant's polymerization effect. Every wind turbine is configured to run at 8 m/s, which is the low wind speed input state. Figures 10 and 11 display the running status of each unit of a hybrid plant station as well as the system frequency regulation curve under various sudden load power increase degrees  
As shown in Figures 10 and 11, the output power of the wind turbine unit is low under low wind speed input. The initial power of the electric hydrogen production operation is low, and the load reduction capacity is limited. In this case, EEMD parameters are adjusted so that the electric hydrogen production device can maximize its participation in frequency regulation, and the supercapacitor assumes the remaining frequency regulation power. When the sudden load power increases by 10 MW and 15 MW, the maximum frequency drop of the system is 0.23 Hz and 0.34 Hz, respectively. At this time, by changing the parameters of the EEMD algorithm and controlling the electric hydrogen production device to maximize the load reduction, the supercapacitor still has a power margin. When the load power suddenly increases to 20 MW, the supercapacitor state of charge drops to 0 at 3.8 s. Due to the energy deficit, the supercapacitor cannot respond to the power instruction, and the maximum frequency drop of the system is 0.45 Hz. The wind turbine runs in a sub-synchronous state when low wind speed is input. The power flowing through the rotor-side converter is 0.12 MW, and the compensating power of the supercapacitor flows to the AC bus through the grid-side converter, so the power flowing through the grid-side converter (GSC) is the difference between the two. When the wind speed is low, by adjusting the EEMD parameters to allocate the power order reasonably, a hybrid plant station has a good frequency regulation effect. The wind speed is 10 m/s, and the wind turbines are configured to maintain an input state of medium wind speed. The hybrid plant station's system frequency regulation curve and the operational state of each unit under varying degrees of unexpected demand power increase (10, 15, and 20 MW) are depicted in Figures 12 and 13. Figures 12 and 13 show that the wind turbine unit output power increases under medium wind speed input. In this case, the power flowing to the electric hydrogen production system is greater, and the load reduction power of the electric hydrogen production device is more significant; therefore, by adjusting the EEMD parameters, the electric hydrogen production device load reduction assumes more frequency regulation power. The supercapacitor frequency regulation power instruction is reduced compared to low wind speed, and the state of charge is high after frequency regulation. When the medium wind speed is input, the wind turbine runs in the super-synchronous state, and the converter power flowing through the rotor side is 0.128 MW. The compensation power of the supercapacitor is inconsistent under different sudden load power increase states, so the power of the converter flowing through the network is also different. When a hybrid plant station participates in frequency regulation, the maximum value of system drop is 0.21 Hz, 0.32 Hz, and 0.43 Hz, respectively; the frequency regulation effect is ideal. Figure 12: System frequency regulation curve under medium wind speed input.