直流配用电系统电能质量问题探讨

Discussion on the power quality of DC distribution system

随着分布式发电、电力电子技术以及直流负荷在低压配电系统的迅速发展和广泛应用,采用直流供用电方式的低压直流(low voltage direct current,LVDC)系统,能够适应可再生能源的大规模接入以及实现新能源发电的就地消纳,同时直流系统还具有高效可靠、灵活性强、电力稳定性高等优势,将成为未来电力系统的发展方向。首先,介绍了LVDC系统电压等级与拓扑结构,给出了常见电压等级的确定方法以及LVDC的常用拓扑结构;然后,结合交流系统电能质量问题从原因、定义、指标等方面深入分析并总结了典型直流电能质量问题;最后,概括了当前直流电能质量控制与治理方法的研究现状,为LVDC系统电能质量研究提供参考。

With the rapid development and wide application of distributed generation,power electronic technology and DC load in low-voltage distribution systems,the low-voltage system that adopts the DC power supply mode will become the future direction of new generation power systems,with its advantages of suitable renewable energy access and local consumption,as well as high efficiency and reliability.This article firstly introduces the voltage level and topology of the LVDC system,then typical DC power quality problems is analyzed in terms of causes,definitions,indicators,etc.combined with AC system power quality problems.Finally,the current research on DC power quality control and governance methods is generalized,which provides a reference for the research on power quality of LVDC systems.