基于低压配电网无功负序不平衡现象的节能降损解决方案  

Solution of Energy Conservation and Loss Reduction Based on Reactive Negative Sequence Unbalance in Low-Voltage Distribution Network

作　　者：赵吴鹏[1] 尹忠东[1] 周浩[1] 张瑜[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206

出　　处：《电网与清洁能源》2009年第7期15-19,共5页Power System and Clean Energy

基　　金：国家高技术研究发展计划(863计划)(2008AA05Z216)

摘　　要：低压配电网中普遍存在的三相不平衡现象将导致系统中出现负序电流,负序电流会在电网中产生损耗,并影响变压器及电动机的正常运行。为消除负序电流,达到节能降损的目的,可利用双向晶闸管控制电抗器、电容器并配合12脉动技术,实现低压配电网三相平衡;详细介绍三相平衡补偿原理,并在实验室搭建了试验模型,分析了得到的波形及数据,结果表明,12脉动技术降低了晶闸管向系统中注入的谐波,在无需滤波器的情况下,便能符合国家标准,节省了投资成本。This paper analyzes three-phase unbalance phenomenon in the low voltage distribution network,Three-phase unbalance will lead to the negative sequence current,and negative sequence current will produce losses in power network and makes the transformer or motor can not in normal operation. In order to eliminate the three-phase unbalance and realize energy conservation and loss reduction,bidirectional thyristor and capacitor are used to eliminate negative sequence current with the 12 pulse technology. This paper daily introduces the principle of three-phase balance compensation, and sets up the test model in the lab, the analysis of wave curves and data get show 12 pulse technology reduces the harmonic current into the power distribution system, and it can meet national standards without filter, which saves the investment.

关 键 词：低压配电网 12脉动 负序电流 三相不平衡 节能降损 

分 类 号：TM711[电气工程—电力系统及自动化]