Networking Mode and Evaluation Method of Low Voltage Direct Current Charging and Discharging System in Residential Communities

This paper proposes an AC/DC decoupling-based DC flexible stack mode according to the characteristics of low-voltage DC charging and discharging systems for residential community. This model not only allows for independent distributions in practice based on actual needs, but also has a high degree of flexibility and expandability. Then we compare the mode proposed in this paper and the traditional single-phase AC mode regarding service capability, economics, and technical performance. The results show that the levelized service cost of AC/DC decoupling stack mode is approximately 2.6 times that of single-phase AC mode with the same basic data settings. However, the single-phase AC mode is inferior in alomost all indicators of the service capabilities and the technology performance. Therefore, the proposed mode has significant advantages in service capability and technical performance, despite its poor economics. Moreover, the proposed mode in this paper has more potential advantages in the future.