直流配电电压等级及负荷距分析

与交流配电相比,直流配电技术在可靠性、供电能力、供电距离和经济性等方面具有明显优势。该文首先从各类分布式电源、典型直流负荷、国内外直流微网系统和相关电压标准等方面分析了直流配电电压等级及研究现状;通过分析影响直流配电电压等级选择的主要因素,提出相关约束条件,根据交、直流配电系统输送能力匹配原则,提出直流配电系统电压等级;根据所提出约束,从输送容量、输送距离和直流配电设备适用性等方面进行校核分析,验证所提出电压等级的有效性;为便于规划设计人员开展工作,分析了所提出直流配电电压等级满足线路末端10%电压偏差时各典型导线截面的直流负荷距。

Voltage Stage and Load Distance for DC Distribution Network

Compared with AC distribution system,the DC distribution technology has obvious advantages on reliability,power supply capacity,power supply distance and economy.Firstly,this paper analyzes the voltage grade of DC distribution network and its research status from aspects of all kinds of distributed power supply,typical DC load,DC microgrid system and related voltage standards at home and abroad,etc.Through analyzing the main influence factors on the voltage grade of DC distribution network,this paper proposes the constraint conditions and the DC voltage grade based on the marching principle of the transmission capacity of AC/DC distribution system.According to the proposed constraint conditions,the verification analysis on transmission capacity,transmission distance and the applicability of DC distribution equipment shows that the proposed voltage grade is effective.To simplify the planning and design,this paper calculates the DC load distance of each typical conductor section when the proposed voltage grade of DC distribution network meets the 10% voltage deviation on power line terminal.