楼宇交直流混合供电模式下直流电压等级的研究

Research on DC Voltage Level of Hybrid AC/DC Building Power Supply System

直流供电相比交流供电具有许多优点,但由于成本、直流开断技术、普通用户使用习惯等方面的限制,智能楼宇全面使用直流前,仍需经历交直流混合供电阶段。由楼宇配电的现状出发,探讨了未来楼宇交直流混合供电方式的整体结构及相应的交、直流负荷分配情况,阐述了直流配电电压等级的选择原则。讨论了楼宇供电中超低压直流配电和低压直流配电电压等级的具体确定方法。综合各种因素,明确了超低压直流配电和低压直流配电中电压等级选择时可取范围的上限值和下限值,为我国楼宇直流供电中电压等级的最终确定提供依据。

Although DC supply has many advantages compared to AC supply, some factors, such as, investment costs, DC interruption technology and ordinary users＇ habit, prevent DC supply technology from fully replacing AC in intelligent building power supply system, and that＇s why hybrid AC/DC supply is more feasible in short-term future. Based on the present situation, the following problems were discussed： the framework of hybrid AC/DC power supply system in future building, the corresponding AC and DC loads division, and selection principle of DC voltage level. The specific methods to determine the low DC voltage level and extra-low DC voltage level in building power supply system were introduced. In addition, the reasonable upper limit and lower limit of the two levels were made clear after the overall consideration of different factors, which can provide reference for setting the Chinese technical standard about the DC power supply voltage level.