## Appendix A  
In Table 2, the customer \(U_{i}\) and the specific meanings of the portrait labels are as follows:  
* (\(U_{1}\)) Monthly load factor  
Monthly load factor, reflecting the fluctuation of load change in the customer for the whole month, this is the ratio of the monthly average load to the monthly maximum load, expressed as follows:  
\[b_{U_{i},lr}=\frac{p_{U_{i},av}}{p_{U_{i},max}}=\frac{\left(\frac{\sum\limits _{v=1}^{v}p_{U_{i},r}}{V}\right)}{P_{U_{i},max}} \tag{1}\]  
In the formula, \(P_{U,sv}\) and \(P_{U,\max}\) are, respectively, the customer's \(U_{i}\) monthly average load and monthly maximum load, and \(P_{U,v}\) is the customer's \(U_{i}\), the load at the firstv load at the last moment. Monthly load ratio is \(b_{U_{i},lr}\). The larger this is, the larger the customer's \(U_{i}\) and the greater the load fluctuation throughout the month. * (\(U_{2}\)) Maximum monthly utilization hours  
Monthly maximum utilization hours, reflecting the time utilization efficiency of the customer's load for the whole month, is the ratio of the total monthly electricity consumption to the maximum monthly load, as follows:  
\[b_{U_{i},mu}=\frac{Q_{U_{i},sum}}{P_{U_{i},max}}=\frac{\int P_{U_{i},v}dt}{P_{ U_{i},max}} \tag{2}\]  
where \(Q_{U,sum}\) is the electricity consumption of the customer \(U_{i}\) for the whole month. The larger the monthly maximum utilization hours \(b_{U,mu}\), the higher the load time utilization efficiency of the customer \(U_{i}\) for the whole month. * (\(U_{3}\)) Average weekday peak-to-valley differential rate  
The average value of peak-to-valley difference rate on weekdays, reflecting the smoothness of electricity consumption by customers on weekdays throughout the month, is the average value of the ratio of the difference between the maximum and minimum loads on weekdays to the maximum load on the same day, and the expression is the following:  
\[b_{U_{i},urd}=\left(\frac{P_{\tau,(U_{i},max)}-P_{\tau,(U_{i},min)}}{P_{\tau,( U_{i},max)}}\right)_{av}=\frac{1}{K_{W}}\sum\limits_{\tau=1}^{K_{w}}\left(\frac{P_{ \tau,(U_{i},max)}-P_{\tau,(U_{i},min)}}{P_{\tau,(U_{i},max)}}\right) \tag{3}\]  
where \(K_{w}\) is the total number of working days in a month; \(P_{\tau,(A_{1},max)}\) and \(P_{\tau,(A_{1},min)}\) are the maximum and minimum loads of customer \(U_{i}\) on the \(\tau\)th working day, respectively. The larger the average value of the peak-to-valley ratio \(b_{U_{i},urd}\) on weekdays, the greater the fluctuation of the load of customer \(U_{i}\) on weekdays. * (\(U_{4}\)) Average non-working day peak-to-valley differential rate  
The average value of peak-to-valley difference rate on non-working days, reflecting the smoothness of electricity consumption by customers on non-working days of the whole month, is the average value of the ratio of the difference between the maximum andminimum loads on non-working days to the maximum load on the same day, with the following expression:  
\[b_{U,mnd}=\left(\frac{P_{\xi,(U_{L},max)}-P_{\xi,(U,min)}}{P_{\xi,(U_{L},max)}} \right)_{av}=\frac{1}{K_{NW}}\sum_{\xi=1}^{K_{NW}}\left(\frac{P_{\xi,(U_{L},max)} -P_{\xi,(U_{L},min)}}{P_{\xi,(U_{L},max)}}\right) \tag{10}\]  
where \(K_{NW}\) is the total number of non-working days in a month; \(P_{\xi,(U_{L},max)}\) and \(P_{\xi,(U,min)}\) are the maximum and minimum loads of the \(\xi\) non-working day customer \(U_{i}\), respectively. The larger the average value of peak-to-valley ratio \(b_{U,mnd}\) on non-working days, the larger the fluctuation of load of \(U_{i}\) on non-working days.