Cost of AC slow charging for energy storage charging piles

Based Eq., to reduce the charging cost for users and charging piles, an effective charging and discharging load scheduling strategy is implemented by setting the charging and discharging power range for energy storage charging piles during different time periods based on peak and off-peak electricity prices in a certain region.

Combining Fig. 10, Fig. 11, it can be observed that, based on the cooperative effect of energy storage, in order to further reduce the discharge load of charging piles during peak hours, the optimized scheduling scheme transfers most of the controllable discharge load to the early morning period, thereby further reducing users' charging costs.

Based on the real-time collected basic load of the residential area and with a fixed maximum input power from the same substation, calculate the maximum operating power of the energy storage-based charging pile for each time period: (1) P m (t h) = P am − P b (t h) = P cm (t h) − P dm (t h)

The simulation results demonstrate that our proposed optimization scheduling strategy for energy storage Charging piles significantly reduces the peak-to-valley ratio of typical daily loads, substantially lowers user charging costs, and maximizes Charging pile revenue.

At the same time, the installation cost of the DC charging pile is higher than that of the AC charging pile. At present, in China, DC charging piles are generally 40 kW, 60 kW and120 kW. The latter two specifications are generally used in expressway network charging stations.

Through sensitivity analysis, it is found that the utilization rate of charging piles and the price of charging service fees are the two most critical factors affecting the economic benefits of charging piles. Moreover, the greater the power of the charging pile, the more prominent the impact of the above two on its profitability.