## 4 Test Results and Discussion
### Test Results of E-dReg Control Strategy  
To validate the proposed control strategy for E-dReg in this paper, the control strategy will be implemented within the controller in this section's control tests. Through actual 24 h frequency regulation control and electricity transfer scheduling, data obtained from the real control tests will be analyzed to observe the data variations in frequency-corresponding output and SOC. Additionally, the execution efficiency of the E-dReg controller will be evaluated by examining the system benefit to schedule performance metric (SBSPM) at the end of the full-day operation.  
In this test, the E-dReg controller was continuously operated for 48 h, spanning two days. The reference frequency for the test was based on the frequencies observed on 27 th and 28 th April 2023, throughout the entire day. The electricity transfer schedule was configured with a charging schedule from 00:00 to 04:00 and a discharging schedule  
Figure 11: The schematic diagram of the archived raw data.  
from 16:00 to 20:00. The charging capacity was set to \(-2.5\) MW, and the discharging capacity was set to 2.5 MW. The test involved scheduling the maximum electricity transfer capacity at 50% over four consecutive hours to observe the control performance and the overall variation in SOC resulting from the control strategy.  
The actual control test results for E-dReg are presented in Table 3 and Figures 12-15. Figures 12 and 14 depict the curves of the actual measured frequency corresponding to the output power under the controller with the control strategy proposed in this paper. In both curve charts, the output power changes with the frequency every second. Within the scheduled energy transfer periods, as set, the baseline of the output power is observed to undergo upward and downward changes, indicating the execution of charging and discharging energy transfer control actions during the scheduled periods. Figures 13 and 15, respectively, depict the curves of the output power corresponding to the SOC after testing. From these two charts illustrating the SOC variations, it can be observed that during the charging period, the SOC baseline is charged to the set 85% by the frequency regulation strategy before stopping the charging action. This clearly demonstrates the protective effect of the added SOC upper and lower limits. Additionally, after the discharge schedule ends, it can be observed that the SOC still remains at 13.15% and 14.96%. All fall within the range set by the control strategy. Finally, it can be clearly observed from Table 3 that the SBSPM execution rates for the two control tests are consistently maintained at 100%, with no occurrences below 100%. This confirms that the E-dReg control strategy proposed in this paper can effectively perform dynamic frequency regulation and energy transfer scheduling for an extended period. It keeps the SOC within the designed range and ensures that the controller successfully maintains a 100% execution rate throughout the day.  
Figure 14: The frequency response power output curve of the E-dReg control strategy (day two).  
Figure 13: The output power versus SOC curve of the E-dReg control strategy (day one).  
Figure 15: The output power versus SOC curve of the E-dReg control strategy (day two).