## 6 Simulation Analysis
### Results Analysis
However, the corresponding ratios in  
Figure 13: The scheduling results of the MECS operation without ESD on a typical day: (**a**) summer and (**b**) winter. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline  & \multicolumn{3}{c}{**Objective Function**} & \multicolumn{3}{c}{**Pollutant**} & \multicolumn{3}{c}{**Complementarity Indexes**} & \multicolumn{3}{c}{**Load**} \\ \multirow{2}{*}{**Scene**} & & & & & & & & & & & & & & & & & \\  & & & & & & & & & & & & & & & \\  & & & & & & & & & & & & & & & \\ \multirow{2}{*}{OEE mode} & Summer & 146.49 & 85.83 & 28.67 & 3794 & 92 & 87 & 57 & 33.64 & 310.05 & 1795 & 1485 \\  & Winter & 163.22 & 94.34 & 46.33 & 3883 & 94 & 90 & 32 & 44.12 & 312.60 & 1765 & 1415 \\ \hline \multirow{2}{*}{LLC mode} & Summer & 145.65 & 95.84 & 26.33 & 4158 & 101 & 95 & 52 & 26.86 & 315.91 & 1808 & 1450 \\  & Winter & 160.85 & 115.62 & 35.33 & 4233 & 103 & 97 & 40 & 34.22 & 316.85 & 1788 & 1408 \\ \hline \multirow{2}{*}{Without ESD} & Summer & 142.18 & 115.54 & 30.15 & 4181 & 101 & 96 & 48 & 18.59 & 324.80 & 1820 & 1430 \\  & Winter & 158.45 & 128.29 & 36.85 & 4381 & 106 & 101 & 30 & 26.17 & 329.90 & 1794 & 1398 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: The comparative results of MECS scheduling under different operation scenarios. the OEE mode were 1.75 and 1.26, and 1.95 and 1.31 in the LLC mode. Overall, to smooth the load demand curve to improve the space of WPP and PV, ESD should be integrated into the MECS. To analyze the influence of the capacity of the ESD on MECS operation, a sensitivity analysis of the ESD capacity was carried out. The values of the objective functions and the complementarity indexes were calculated for different ESD capacities. Assuming that the maximum and rated discharge-charge power of the ESD are positively correlated with the ESD capacity, the optimal MECS operation can be obtained for different ESD capacities. Figure 15 shows the objective function value of the MECS operation with different ESD capacities. It can be seen that when the MECS was scheduled on a typical summer day, the ESD capacity demand for MECS operation was low, as the available WPP output was relatively low. When the ESD capacity reached 1000 MW in the OEE mode, the values of objective functions reached the limit values, namely, F\({}_{1}\), F\({}_{2}\), and F\({}_{3}\) were equal to 1553.8 thousand Yuan, 708.2 thousand Yuan, and 24.32 MW, respectively. The values of the objective functions were nearly unchanged when the capacity was more than 1000 MW, namely, the capacity ratios of the ESD to the WPP and the ESD to the PV reached 0.77. The ratio was 1.08 in the LLC mode. However, when the ESD was scheduled on a typical winter day, the ESD capacity demand for the MECS operation was relatively high as the available WPP output was high. When the ESD capacity reached 1400 MW in the OEE mode, the values of the objective functions reached the same limit values as on a typical summer day. Thus, the corresponding ratios were 0.92 and 1.23. Overall, the values of the objective functions were better when the ESD capacity was high. However, they reached the limit values when the ESD capacity reached the required capacity. Figure 16 shows the values of the complementarity indexes under different ESD capacities. Figure 14: The net output curve of the thermal power units under different operational strategies. Figure 15: The objective function values of MECS operation under different ESD capacities. It can be seen that the values of the complementarity indexes improved as the ESD capacity increased. It should be noted that this trend was not always continuous. When the MECS was scheduled on a typical summer day, the change was small once the ESD capacity reached 800 MW in the OEE mode and 1300 MW in the LLC mode, i.e., the capacity ratios of the ESD to the WPP and the ESD to the PV were 0.62 and 1, respectively.