直接并联模块化逆变器零序环流抑制

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摘要新型FREEDM微网中,采用逆变器直接并联技术可提高固态变压器的并网容量,但受到运算放大器零点漂移、谐波扰动以及信号延迟等因素的影响,该技术存在严重的零序环流问题。在并联逆变器间零序环流的平均模型和同步旋转坐标模型基础上,分析dq0坐标轴参考信号与输出电压的关系,提出理想机模型对PWM调制波参考信号进行误差反馈调节,实现各逆变器之间互不干扰地进行零序环流抑制,采用顺序控制方案,增加了控制器的调节效率和准确度。在PSCAD/EMTDC环境下仿真结果表明,所采用控制策略对零序环流具有有效的抑制作用,同时提高了功率均分的准确度。

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	张明锐
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关键词 ： FREEDM微网, 直接并联模块化逆变器, 理想机模型, 零序环流抑制, 功率均分

Abstract：In the FREEDM microgrid, direct parallel inverter technology can improve the capacity of solid state transformers. However, there will be large zero-sequence circulating currents, due to the impacts of the zero drift of operational amplifiers, harmonic disturbances and signal delay. Based on the average model and synchronous rotating coordinate model of zero-sequence circulating currents among direct parallel inverters, this article analyses the relationship between dq0 reference signal and the output voltage. Then an ideal machine model is proposed, to regulate the reference voltage of PWM carriers with error feedback according to a certain order, and to realize the zero-sequence circulating currents restraining and power sharing. The case study in PSCAD/EMTDC shows that the control strategy can restrain the zero-sequence circulating currents effectively, and improve the accuracy of power sharing.

Key words： FREEDM micro-grid directly parallel modular inverters ideal machine model zero-sequence circulating current restraining power sharing

收稿日期: 2013-12-01 出版日期: 2015-10-30

PACS:

TM464

基金资助:国家技术支撑计划（2015BAG19B00）,上海市自然科学基金（13ZR1444400）和上海市科委项目（13DZ1200403）资助

作者简介: 张明锐男,1971年生,副教授,硕士生导师,研究方向为分布式发电与微网、轨道交通牵引供电技术。宋柏慧女,1993年生,硕士研究生,研究方向为分布式电源并网。

引用本文:

张明锐,宋柏慧,林显琦,欧阳丽,孙华. 直接并联模块化逆变器零序环流抑制[J]. 电工技术学报, 2015, 30(20): 100-107. Zhang Mingrui, Song Baihui, Lin Xianqi, Ouyang Li, Sun Hua. Restraining Zero-Sequence Circulating Current of Directly Parallel Modular Inverters. Transactions of China Electrotechnical Society, 2015, 30(20): 100-107.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I20/100

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