Active Cross-Correlation Anti-Islanding Scheme for PV Module-Integrated Converters in the Prospect of High Penetration Levels and Weak Grid Conditions

被引:34
|
作者
Voglitsis, Dionisis [1 ]
Papanikolaou, Nick Peter [1 ]
Kyritsis, Anastasios Ch. [2 ]
机构
[1] Democritus Univ Thrace, Dept Elect & Comp Engn, Lab Elect Machines, GR-67100 Xanthi, Greece
[2] Ctr Renewable Energy Sources, Dept PV Syst & DER, Pikermi 19009, Greece
关键词
Anti-islanding; cross correlation; interleaved flyback inverter; microinverter; module-integrated converter (MIC); photovoltaic; PHOTOVOLTAIC AC-MODULE; FLYBACK INVERTER; TOPOLOGIES; IMPLEMENTATION; EFFICIENCY;
D O I
10.1109/TPEL.2018.2836663
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper introduces a new cross-correlation anti-islanding detection scheme for module-integrated converters (MICs) with pseudo dc-link. The proposed scheme periodically injects a second-order harmonic current component of low magnitude (in open-loop mode) and evaluates grid response by means of correlation. The proposed scheme is highly reliable, providing nondetection-zone free operation, fast detection, and compliance with the relevant power quality and anti-islanding standards. Additionally, it excels in lower computational cost, reduced fault detection zone, and higher output power quality, compared to the referenced anti-islanding schemes that are compatible with MICs. Last but not least, it can be implemented in MIC platforms without requiring an output current sensor, being an easily upgradable solution in software level. A firm theoretical framework that considers both high penetration levels of PV systems and weak grid conditions is also included in this paper. The theoretical framework, as well as the effectiveness of the proposed scheme, is verified through extensive experimental results for various electrical-network parameters and nonlinear loading conditions. Finally, a comprehensive comparison between the proposed method and the most common anti-islanding techniques (compatible with MICs) is performed, leading to some valuable conclusions from MICs perspective.
引用
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页码:2258 / 2274
页数:17
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