一种三角形联结串联H桥SVG直流侧电压控制方法研究

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摘要通过对三角形联结串联H桥SVG直流侧电压均衡控制进行深入研究,建立三层直流侧电压均衡控制系统。第一层为总直流侧电压,通过产生基波正序有功电流维持三相所有H桥模块直流侧电压之和恒定;第二层为三相之间均衡控制,通过在变流器指令电压中注入零序电压产生零序电流实现三相功率的再分配,实现三相均衡;第三层为每相内部各H桥模块均衡控制,通过沿电流方向微调每相各模块指令电压实现各模块吸收的功率重新分配,进而保证模块直流侧电压等于给定值。最后通过实验验证了该控制方法的可靠性和有效性。

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	何英杰
	付亚彬
	段文岩

关键词 ：三角形联结, 级联H桥SVG, 直流侧电压控制

Abstract：The in-depth study of the DC voltage balancing for the delta connection cascaded H bridge SVG has been carried out in this paper.A three layer DC voltage balancing control system is proposed.The first layer is the total DC side voltage control.Through generating fundamental positive sequence active current,the total DC side voltage of all three-phase H bridge modules is maintained constant.The second layer is the balancing control between three phases.Through injecting zero sequence voltage into the command voltage to produce zero sequence current,the three-phase power can be redistributed,thus the DC voltage balancing between three phases is achieved.The third layer is the balancing control between each module in each phase.Through fine tuning of the command voltage of each module in each phase along the direction of the current,the absorbed power of each module can be redistributed,thus the DC side voltage of each module in each phase can be kept as the reference value.Experimental results verify the correctness and reliability of the proposed control method in the end.

Key words： Delta connection cascaded H bridge SVG DC side voltage control

收稿日期: 2014-12-05 出版日期: 2015-05-22

PACS:

TM464

基金资助:国家自然科学基金(50907052),陕西省自然科学基金(2014JQ7271)和输配电装备及系统安全与新技术国家重点实验室访问学者项目(2007DA10512714405)资助。

通讯作者: 何英杰男,1978年生,博士,副教授,硕士生导师,研究方向为多电平技术、有源电力滤波器和无功补偿。

作者简介: 何英杰男,1978年生,博士,副教授,硕士生导师,研究方向为多电平技术、有源电力滤波器和无功补偿。付亚彬男,1985年生,硕士研究生,研究方向为多电平技术、有源电力滤波器和无功补偿。

引用本文:

何英杰, 付亚彬, 段文岩. 一种三角形联结串联H桥SVG直流侧电压控制方法研究[J]. 电工技术学报, 2015, 30(9): 70-78. He Yingjie , Fu Yabin , Duan Wenyan. Research on DC Voltage Control Method of Delta Connection Cascaded H Bridge SVG. Transactions of China Electrotechnical Society, 2015, 30(9): 70-78.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I9/70

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