## 5 Simulation Analysis
### IEEE-33 System Simulation Analysis
In Scenario 2, the current harmonic distortion rate was successfully reduced below the standard value, and the improvement rates were 45% and 47%, respectively. Although nodes 8 and 25 did not exceed the standard, the percentage of improvement through energy storage optimization can reach up to 50% and 26%. As can be seen from Figure 7c, the percentage of improvement of power quality relative to the standard value at each time was a positive value, which means that the power quality had improved. From 8 am to 7 pm, ETSHE mainly used the abandoned light resources, and other times mainly used abandoned wind resources. \begin{table}
\begin{tabular}{c c} \hline
**Node Number** & \(P_{DG}\)/\(MW\) \\ \hline
4 (Resident load) & 0.3 \\ \hline
8 (Business load) & 1.0 \\ \hline
13 (Resident load) & 0.3 \\ \hline
25 (Industrial load) & 1.1 \\ \hline
31 (Education load) & 0.16 \\ \hline \end{tabular}
\end{table} 
Table 4: Optimized Configuration Results. \begin{table}
\begin{tabular}{c c c c} \hline
**Optimal Planning** & **Before Analysis** & **After Analysis** & **Effectiveness** \\
**Model of ETSHE** & & **Enhancement** \\ \hline Calculation time/s & 153.6 & 121.5 & 60\% \\ \hline \end{tabular}
\end{table} 
Table 5: Comparison analysis before and after node sensitivity analysis. According to GB/T12325, the absolute value of the voltage deviation should be less than or equal to 7% [33]. As can be seen from Figure 8, taking into account the load characteristics and the reasonable planning of the ETSHE, the voltage deviation of each node was significantly reduced and the voltage deviation of the access point at each moment was within the allowed range of the national standard. As can be seen from Figure 8a,b, at 12:00 am, the light intensity was the highest, but the corresponding  
Figure 7: Current harmonic distortion rate curve. (**a**) Comparison of sub-scenarios of nodes 4 and 8. (**b**) Comparison of sub-scenarios of nodes 25 and 31. (**c**) Percentage improvement of current harmonic distortion rate relative to the standard value. voltage deviation was the lowest. The voltage deviation was inversely proportional to both wind speed and light intensity. Furthermore, as can be seen from Figure 8c, the percentage of each node's improvement relative to the standard value was positive, with an average improvement rate of 38%, and the voltage deviation of each node was improved. Figure 8: Voltage deviation curve. (**a**) Comparison of sub-scenarios of nodes 4 and 8. (**b**) Comparison of sub-scenarios of nodes 25 and 31. (**c**) Percentage improvement of voltage deviation relative to standard value. According to the GB/T12326-2008 standard, the voltage fluctuation of a 10 kV distribution network should be less than or equal to 4% [23]. As can be seen from Figure 9a,b, through the optimized configuration of energy storage, the node voltage fluctuation was improved. At 12:00 am every day, the light intensity was the highest, but the voltage fluctuation is the lowest. It can be seen from Figure 9c that at the time when there was more wind power and photovoltaic power generation, the voltage fluctuation was greatly improved relative to the standard value. Among them, node 4 increased by 23% on average, nodes 8 and 25 increased by about 25%, and node 31 increased by 11.2% on average. Figure 9: Voltage fluctuation curve. (**a**) Comparison of sub-scenarios of nodes 4 and 8. (**b**) Comparison of sub-scenarios of nodes 25 and 31. (**c**) Percentage improvement of voltage fluctuation relative to standard value.