三相光伏并网发电系统THD及DCI优化方法研究

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摘要电流总谐波畸变（THD）和直流电流注入（DCI）等电能质量问题限制了光伏并网发电系统的大规模应用。提出新的减小THD及抑制DCI的方法以提高逆变器输出电流波形的质量,即将基于多个矢量比例积分（VPI）控制器并联的多矢量比例积分（MVPI）控制器应用于电流控制中以减小入网电流THD;设计一种直流分量提取电路,通过基于预测算法的控制策略达到抑制DCI的目的,同时探讨了THD和DCI二者之间的关系。在一台10kW光伏并网逆变器样机上进行了实验验证,实验结果证明了所提方法的有效性和实用性。

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	张国月
	秦梦珠
	齐冬莲
	吴越
	张建良

关键词 ：矢量比例积分控制器, 多矢量比例积分控制器, 总谐波畸变, 预测算法, 直流电路注入

Abstract：The power quality, including total harmonic distortion(THD) and direct current injection(DCI), restricts the massive application of photovoltaic grid-connected generation system. Novel methods focusing on DCI suppression and THD reduction are proposed to improve the quality of output current. DC current extraction circuit is designed and control strategy based on prediction algorithm is used to eliminate the DC offset current. Multi-vector proportional integral(MVPI) current controller based on VPI is adopted to decrease the THD. Also, the relationship between DCI and THD is discussed, which implies that both of them are closely connected, and optimization of one can enhance the other obviously. Experiments on 20kW PV inverter prototype have shown the effectiveness and practicality of the proposed method.

Key words： Vector proportional integral controller multi-vector proportional integral controller total harmonic distortion prediction algorithm direct current injection

收稿日期: 2013-07-22 出版日期: 2015-09-14

PACS:

TM615

基金资助:国家高技术研究发展（863）计划（2015AA050402）,中央高校基本科研业务费专项资金（2014QNA4011）和浙江省教育厅科研项目（LY14E070006）资助项目

作者简介: 张国月男,1987年生,博士研究生,研究方向为新能源发电与微电网。秦梦珠女,1992年生,硕士研究生,研究方向为新能源发电。

引用本文:

张国月,秦梦珠,齐冬莲,吴越,张建良. 三相光伏并网发电系统THD及DCI优化方法研究[J]. 电工技术学报, 2015, 30(16): 238-245. Zhang Guoyue,Qin Mengzhu,Qi Donglian,Wu Yue,Zhang Jianliang. Research on Optimization Method of THD and DCI in Three-Phase Grid-Connected PV Generation System. Transactions of China Electrotechnical Society, 2015, 30(16): 238-245.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I16/238

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