分布式网中的变流器拓扑结构性能的对比分析  

The Research of the Comparison between the Four-wire Four-leg Non-split Topology and the Four-leg Three-leg Split Converter in the Distribution Networks

作　　者：苗青[1] 杨剑锋[1] 谢延凯[1] 刘坤[2] 

机构地区：[1]兰州交通大学自动化与电气工程学院,兰州730070 [2]石家庄铁道大学电气与电子工程学院,石家庄050043

出　　处：《科学技术与工程》2014年第13期184-190,共7页Science Technology and Engineering

摘　　要：在我国现行的低电压配电网络中一般采用TT、TN配电方式,即三相四线制配电,为了使分布式发电机组与四线制低压电网相连接,需要选择一个合适的变流器拓扑结构。同时为了提高电网中的电能质量,分布式发电机组需要添加有源电力滤波器(APF)后再接入四线制低压电网中。现对两种四线制拓扑结构——非分裂链路式四桥臂变流器和分裂链路式三桥臂变流器拓扑结构的性能进行对比分析。在控制的难易程度、电磁兼容性(EMC)、中点控制、直流侧母线电压利用率和电路复杂性等方面进行对比分析。总结出分裂链路式三桥臂拓扑结构变流器主要性能要优于非分裂链路式四桥臂变流器,主要体现于相同电路复杂性和直流母线利用率的参照标准下,分裂链路式三桥臂拓扑结构的变流器在电流控制方面更加简单,同时有较小的电磁兼容性问题。Generally speaking，nowadays，the TT and TN methods of the low-voltage distribution networks are widely used in our nationality，namely，the three-phase four-wire power system．In order to connect the distributed units to the power system，a suitable converter topology should be chosen to improve the power quality in the grid．This paper mainly to make a comparison analysis based on the performance of the two four-wire topology converters，the topology of the non-split-link four-leg converter and split-link four-wire converter．The fundamental criteria of the comparison are the ease of control，EMC performance，mid-point control，dc-bus voltage utilization and circuit complexity．It is summarized that the major performance of the split-link three-leg converter is much better than the non-split-link four-leg converter．

关 键 词：低压分布电网 变流器拓扑结构 性能比较 控制策略 

分 类 号：TM464[电气工程—电器]