配电网三相不平衡过电压有源抑制方法研究

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摘要分析三相不平衡电压的产生机理,提出有源抑制方法,设计了有源逆变装置,等效为可控电流源,安装在中性点与地之间,优化控制注入电流的大小和相位,能强迫电网三相电压平衡。仿真分析和样机实验测试结果表明,该方法不需要测量线路对地参数,抑制三相不平衡过电压速度快、准确度高,甚至能将中性点位移电压抑制到零。

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	曾祥君
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关键词 ：配电网, 三相不平衡, 有源逆变, 注入电流

Abstract：The unbalanced three-phase impedances to the ground will cause three-phase unbalanced voltage in the distribution networks with ineffective earthed methods.The unbalanced over voltage has influence on the reliability and security of the distribution network.The overvoltage generating mechanism is analyzed in this paper.Based on that,an active over voltage suppression method is proposed.The suppression device,equivalent to a controllable current source,is developed and installed between the neutral point and the ground.It can optimally control the phase and amplitude of the injection current,and then force the three-phase voltage to be in balance.The simulation analysis and the prototype experiment results show that this method can suppress the three-phase unbalanced overvoltage quickly and effectively without measuring the three-phase impedances to the ground.The neutral point displacement voltage can be suppressed to zero in this way.

Key words： Distribution networks three-phase unbalance active inverter injection current

收稿日期: 2014-11-15 出版日期: 2015-05-22

PACS:

TM77

基金资助:国家自然科学基金(61233008、51277014、51207014、51407014),湖南省科技重大专项(2012FJ1003)和湖南省高校产业化培育项目(12CY007)资助项目。

通讯作者: 曾祥君男,1972年生,博士,教授,研究方向为电力系统微机保护与控制。

作者简介: 曾祥君男,1972年生,博士,教授,研究方向为电力系统微机保护与控制。黄明玮男,1989年生,硕士研究生,研究方向为电力系统保护与控制。

引用本文:

曾祥君, 黄明玮, 王文, 陈锐, 范必双. 配电网三相不平衡过电压有源抑制方法研究[J]. 电工技术学报, 2015, 30(9): 61-69. Zeng Xiangjun , Huang Mingwei , Wang Wen , Chen Rui , Fan Bishuang. Research on Active Suppression Method of Three-Phase Unbalanced Overvoltage for Distribution Networks. Transactions of China Electrotechnical Society, 2015, 30(9): 61-69.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I9/61

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