基于三相-单相交直交变换器的配电网供电方式研究  

Study on Power Supply Mode of Distribution Network Based on Three-phase to Single-phase AC/DC/AC

作　　者：梁振锋[1] 王彦超 周翔宇 张惠智 王晓卫 LIANG Zhenfeng;WANG Yanchao;ZHOU Xiangyu;ZHANG Huizhi;WANG Xiaowei(School of Electrical Engineering,Xi’an University of Technology,Xi’an 710054,China;State Grid Shaanxi Electric Power Company Xixian New Area Power Supply Company,Xi’an 712000,China)

机构地区：[1]西安理工大学电气工程学院,西安710054 [2]国网陕西省电力公司西咸新区供电公司,西安712000

出　　处：《电力电容器与无功补偿》2023年第5期67-72,共6页Power Capacitor & Reactive Power Compensation

基　　金：国家自然科学基金(52177114)。

摘　　要：针对配电网三相不平衡,提出了一种基于三相-单相交直交变换器的配电网供电方式。将配电变压器低压侧的三相交流电整流为直流,进而逆变为单相交流电连接至用户,并增设了滤波器。从建设投资、运行维护费用两方面分析了所提出供电方式的经济性,给出了提高三相-单相交直交变换器运行可靠性的措施。在供电半径与用户负荷分布相同的条件下,利用PSCAD/EMTDC分别建立了三相四线制和三相-单相交直交变换器的仿真模型,进行了多种三相不平衡工况的仿真,对比分析了用户的电压偏差、线损等,给出了所提供电方式的适用场合。分析及仿真结果表明,三相-单相交直交变换器供电方式可以改善配电网电能质量。Aiming at the three-phase unbalance of the distribution network,a kind of power supply mode of distribution network based on three-phase to single-phase AC/DC/AC converter is proposed.The three-phase AC at the low voltage side of the distribution transformer is rectified to DC,and then inverted into a single-phase alternating current and connected to the user and the filter is added.The economy of the proposed power supply mode is analyzed from such two aspects as construction investment and operation as well as maintenance cost,and the measures to improve the operational reliability of the three-phase to single-phase AC/DC/AC converter are given.Under the same conditions of power supply radius and load distribution,the simulation models of three-phase four-wire system and three-phase-single-phase AC/DC converters are set up respectively by PSCAD/EMTDC.The simulation of various three-phase unbalanced conditions is carried out,and the voltage deviation and line loss of the user are compared and analyzed.The applicable occasions of the proposed power supply mode are given.The analysis and simulation results show that the power supply mode of the three-phase-single-phase AC/DC converter can improve power quality of distribution network.

关 键 词：配电网 运行方式 电能质量 三相不平衡 三相-单相供电 

分 类 号：TM46[电气工程—电器]