微网中双向DC-AC变流器的性能优化控制

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摘要为解决用于直流微网与交流电网相连的双向DC-AC变流器因受到交直流双侧母线电压谐波的影响而导致的交流并网电流波形质量恶化等问题,首次推导了考虑交直流双侧电压谐波情况下的DC-AC变流器交流并网电流的表达式,揭示了交直流双侧电压谐波影响的本质和特征。同时引入DC-AC变流器交流侧并网电流dq轴分量的比例-积分-双重复控制策略以抑制上述影响。进一步针对数字化系统中存在的系统采样频率与基波频率比为非整数造成重复控制器增益显著衰减的问题,提出基于对期望采样数据进行局部线性插值的重复控制器增益提升方法,以增强重复控制器对交流电网电压谐波的抑制性能。详细的仿真和实验结果证明了理论分析以及所提交流并网电流波形质量优化控制策略的正确性和有效性。

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	杨刚
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关键词 ：微电网, DC-AC变流器, 双侧电压谐波, 重复控制

Abstract：In the dual-direction DC-AC converter used to connect the DC microgrid and the AC grid, the AC voltage and DC voltage harmonics will generate lower-order harmonics in the AC grid current of the DC-AC converters. In order to tackle the problem, the grid current expression of the DC-AC converter considering the AC and DC dual side voltage harmonics is deduced for the first time and the essence and character of this effect have been revealed. The proportional-integral-dual repetitive control strategy is introduced into the d and q axis of the grid current to control the grid current of the DC-AC converter. Furthermore, aiming at the problem that the non-integral ratio of the sampling and fundamental frequencies in the digital system will decay the gain of the repetitive controller, a gain enhancement approach for the repetitive controller with the desirable sampling point linear interpolation algorithm is proposed to improve the performance of the repetitive control in terms of cancelling the grid voltage harmonics. Detailed simulation and experimental results validate the accuracy and validity of the theoretical analysis and the improvement scheme of the AC grid current waveform quality of the DC-AC converter.

Key words： Microgrid DC-AC converter dual-side voltage harmonics repetitive control

收稿日期: 2015-11-30 出版日期: 2016-04-20

PACS:

TM46

基金资助:国家高技术研究发展计划(863计划)资助项目(2012AA050208)。

作者简介: 杨刚男,1986年生,博士研究生,研究方向为微电网控制及保护技术、电力电子技术在电力系统中的应用。E-mail:yang_g86@126.com(通信作者);张涛男,1971年生,教授级高工,研究方向为电力系统继电保护、微网新能源接入及控制、柔性直流输电等。E-mail:zhangtao@sf-auto.com

引用本文:

杨刚, 杨奇逊, 张涛, 刘树, 张恒. 微网中双向DC-AC变流器的性能优化控制[J]. 电工技术学报, 2016, 31(7): 81-91. Yang Gang, Yang Qixun, Zhang Tao, Liu Shu, Zhang Heng. Improvement Control of Dual-Direction DC-AC Converters for Microgrids. Transactions of China Electrotechnical Society, 2016, 31(7): 81-91.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I7/81

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