基于近用户侧直流用电电器的电压等级选择

DC Voltage Class Selection Based on Electrical Appliances near the User Side

随着分布式新能源的发展和基于电力电子技术的用电设备再电气化升级,源荷直连直供的直流供用电系统不断发展,成为能源互联网研究的重点。其中直流电压等级的研究与确立,成为跨源、储、网、荷各行业协同构建直流供用电系统新生态的先决条件。首先对基于不同行业、不同标准体系、不同研究方法等的直流电压等级序列进行概述,引申出低压直流电压等级的依据及建议;从建筑内用户侧用电电器角度研究分析直流电压等级较少的情况,从用户侧直流用电电器的角度出发,具体对建筑内典型用电"大户"--空调产品的直流电压等级选择思路进行了分析,给出了在光伏(储)空调一体化设备母线运行范围、核心部件(高反电动势电机)驱动控制、家居分区本质安全等因素影响下的电压等级制定建议;最后对近用户侧用电电器的直流化进程进行了总结,并对直流经济性、高效性等特点的发挥以及产业发展基础的夯实提出了建议。

With the development of distributed new energy and the re-electrification upgrade of electrical equipment based on power electronics technology,the DC power supply and utilization system with direct connection of source-load and direct supply is developing continuously,which is the focus of energy internet research.Among them,the research and establishment of DC voltage class become the prerequisite for the collaborative construction of new DC ecology across the source,storage,grid,and load industry.This paper summarizes the selection of DC voltage class series in different industries,different standard systems and different research methods.The suggestions for DC voltage class is extended in building,and then aiming at the situation of less research based on the angle of electrical appliances of users in the building,analyzes the typical electrical appliances-air conditioning products about selecting the DC voltage class series.Beside,it gives suggestions on the voltage class under the influence of the factors such as the bus operating range of integrated photovoltaic-energy storage-air conditioning equipment,driving control of high counter electromotive force motor,and intrinsic safety of home partition.Finally,the paper summarizes the process of DC electrical appliances based on the user side and promotes the consolidation of the foundation of industrial development.