基于直接AC/AC变换的动态电压恢复器研究

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摘要应用电压源逆变方案的传统动态电压恢复器, 需要使用大容量电解电容进行储能, 体积与重量大, 成本高。为了避免使用直流储能环节, 提出一种基于直接AC/AC变换的动态电压恢复器, 其变压器一次侧通过固态继电器投切组与AC/AC变换器输出端相连, 其二次侧与负载串联。当电网电压发生波动时, 由AC/AC变换器产生补偿电压, 通过切换固态继电器组改变隔离变压器输出极性, 保持负载电压稳定。该方案不需使用大容量电解电容等储能元件, 易于维护, 换流过程简单, 动态响应速度快, 能够有效补偿电网电压波动。在理论分析基础上, 设计了基于瞬时电压的复合控制策略, 实验结果验证了所提方案的有效性。

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	金楠
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关键词 ：直接AC/AC变换, 动态电压恢复, 换流策略, 复合控制

Abstract：Traditional dynamic voltage restorer (DVR) based on voltage source inverter (VSI) needs energy storage devices, such as electrolytic capacitors, which are heavy and high cost.A new type of storageless DVR based on improved direct AC/AC power conversion is proposed.It consists of direct AC/AC power converter, solid-state-relay (SSR) and isolation transformer whose primary port is connected with AC/AC converter through SSR and secondary port is connected with the load.When line voltage fluctuations occur, AC/AC converter generates compensation voltage, whose polarity is controlled by switching the SSR group in order to stabilize the load voltage.The proposed restorer does not use energy storage devices and has simple commutation process, fast dynamic response and low cost.An experimental prototype is designed.Experiment results show that the load voltage can be kept stable under line voltage swells or sags circumstances, which verifies the validity of the proposed plan.

Key words： Direct AC/AC converter dynamic voltage restorer commutation strategy compound control

收稿日期: 2015-01-08 出版日期: 2015-06-29

PACS:

TM761

基金资助:河南省科技攻关项目(142102210517)和郑州轻工业学院博士科研基金(2013BSJJ025)资助项目。

通讯作者: 金楠男, 1982年生, 博士, 副教授, 研究方向为交交电能变换与控制、分布式发电系统。

作者简介: 金楠男, 1982年生, 博士, 副教授, 研究方向为交交电能变换与控制、分布式发电系统。(通信作者)康冬祎女, 1990年生, 硕士研究生, 研究方向为直接AC/AC功率变换器、分布式发电系统。

引用本文:

金楠, 康冬祎, 崔光照. 基于直接AC/AC变换的动态电压恢复器研究[J]. 电工技术学报, 2015, 30(11): 71-77. Jin Nan, Kang Dong-yi, Cui Guang-zhao. Research on Dynamic Voltage Restorer Based on Direct AC/AC Power Conversion. Transactions of China Electrotechnical Society, 2015, 30(11): 71-77.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I11/71

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