Suppression of Low-frequency Voltage Ripple in Cascaded H-bridge Multilevel Converters-based Large-scale PV Systems

2022 IEEE 13th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2022-06-26 DOI:10.1109/PEDG54999.2022.9923127

Kangan Wang, Derui Kong, Zhengchao Zhong, Ning Gao, Fei Jiang, Weimin Wu, M. Liserre

{"title":"Suppression of Low-frequency Voltage Ripple in Cascaded H-bridge Multilevel Converters-based Large-scale PV Systems","authors":"Kangan Wang, Derui Kong, Zhengchao Zhong, Ning Gao, Fei Jiang, Weimin Wu, M. Liserre","doi":"10.1109/PEDG54999.2022.9923127","DOIUrl":null,"url":null,"abstract":"Cascaded H-bridge (CHB) multilevel converters are promising candidates for large-scale grid-connected PV systems thanks to its modularity, scalability and distributed maximum power point tracking (DMPPT). However, CHB converters inherently have low-frequency power ripple in dc links, thus require large dc-link electrolytic capacitors to mitigate the resulting voltage ripple, which will lead in reduction of system reliability. In order to solve the above issues, this paper adopts the system topology architecture composed of CHB multilevel converter and quadruple active bridges (QAB) dc-dc converters, combining with the intercross control structure. This scheme not only can improve the system reliability by decreasing the dc-link capacitance, but also can prevent the low-frequency ripple propagating to the PV ports. Simulation results clearly verify the effectiveness and feasibility of the topology and control strategy.","PeriodicalId":276307,"journal":{"name":"2022 IEEE 13th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2022-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2022 IEEE 13th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/PEDG54999.2022.9923127","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 1

Abstract

Cascaded H-bridge (CHB) multilevel converters are promising candidates for large-scale grid-connected PV systems thanks to its modularity, scalability and distributed maximum power point tracking (DMPPT). However, CHB converters inherently have low-frequency power ripple in dc links, thus require large dc-link electrolytic capacitors to mitigate the resulting voltage ripple, which will lead in reduction of system reliability. In order to solve the above issues, this paper adopts the system topology architecture composed of CHB multilevel converter and quadruple active bridges (QAB) dc-dc converters, combining with the intercross control structure. This scheme not only can improve the system reliability by decreasing the dc-link capacitance, but also can prevent the low-frequency ripple propagating to the PV ports. Simulation results clearly verify the effectiveness and feasibility of the topology and control strategy.

查看原文本刊更多论文

级联h桥多电平变流器对大型光伏系统低频电压纹波的抑制

级联h桥(CHB)多电平变流器具有模块化、可扩展性和分布式最大功率点跟踪(DMPPT)等优点，是大规模并网光伏系统的理想选择。然而，CHB变换器在直流链路中固有的低频功率纹波，因此需要大的直流链路电解电容来缓解由此产生的电压纹波，这将导致系统可靠性的降低。为了解决上述问题，本文采用了由CHB多电平变换器和四重有源桥(QAB) dc-dc变换器组成的系统拓扑结构，并结合交叉控制结构。该方案不仅可以通过减小直流链路电容来提高系统的可靠性，而且可以防止低频纹波传播到PV端口。仿真结果清楚地验证了拓扑结构和控制策略的有效性和可行性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

2022 IEEE 13th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

自引率

0.00%

发文量