文章摘要
罗培,夏令.基于串并联结构的混合型三相四线制配电网电能质量补偿器[J].电力系统自动化. DOI: 10.7500/AEPS20161129004.
Luo Pei,Xia Ling.A Hybrid Distribution Network Power Quality Compensator Based on Series-Parallel Structure for Three-Phase Four-Wire System[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20161129004.
基于串并联结构的混合型三相四线制配电网电能质量补偿器
A Hybrid Distribution Network Power Quality Compensator Based on Series-Parallel Structure for Three-Phase Four-Wire System
DOI:10.7500/AEPS20161129004
关键词: 三相四线  串联变压器  可变阻抗;中性线电流
KeyWords: three-phase four-wire  series transformer  variable impedance  neutral current
上网日期:2017-05-16
基金项目:国网湖南省电力公司科技专项计划(5216A515008F)
作者单位E-mail
罗培 湘潭大学 lpmq@163.com 
夏令 湘潭大学 446896834@qq.com 
摘要:
      为了解决三相四线制配电网电能质量问题,特别是中性线电流过载问题,本文提出了一种基于串并联结构的混合型三相四线制配电网电能质量补偿器。该系统并联部分由配电网静止同步补偿器(DSTATCOM)构成,串联部分主要包括单相H桥变流器和小容量串联变压器,这种新型串联结构,在治理中性线电流时,可以解决传统变压器并联补偿方式下所需变压器容量较大,治理效果不理想等问题。分析了新型串联部分的数学模型,将串联变压器等效为一个串联在中性线上的可变阻抗,并引入补偿系数 ,通过调节 的大小来改变中性线上的等效阻抗和电流。从容量和治理效果两个方面将其与传统变压器并联结构进行了对比分析。最后,仿真实验分析表明本文所提结构的正确性和有效性。
Abstract:
      To solve the power quality problems especially the neutral current overload problem in three-phase four-wire low-voltage distribution network, a hybrid distribution network power quality compensator based on series-parallel structure for three-phase four-wire system is proposed in this paper. The parallel part of the system is consist of the distribution network static synchronous compensator (DSTATCOM). The series part is mainly composed of the single-phase H-bridge converter and the small-capacity series transformer. To reduce neutral current, the customized transformer parallel compensation is employed in system but it is usually inefficient and requires large capacity transformers. This paper presents a novel series compensator structure. Firstly, the mathematical model of the new series compensator is analyzed, the series transformer is equivalent to a variable impedance connected in series with the neutral line and the compensation coefficient is introduced to adjust the equivalent impedance and the current on the neutral line. Then, the comparison is made with customized transformer parallel compensation from the aspects of capacity and effect. Finally, the correctness of the analysis and proposed strategy is verified by the simulation results.
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