控制与信息技术Issue(6)：60-66,7.DOI:10.13889/j.issn.2096-5427.2024.06.008
分布式构网型并网变流器环流抑制控制方法
Circulating Current Suppression Control Method for Distributed Grid-Connected Converter
摘要
Abstract
Distributed three-level converters operate in a grid-connected state through an input-parallel output-parallel(IPOP)mode.These converters offer advantages such as high efficiency,high flexibility,and low cost,making them widely applicable in new energy scenarios such as energy storage converter and photovoltaic converter.Grid-connected converters are deemed one of important solutions in the context of increasing proportions of renewable energy utilization and power electronic equipment application.In order to suppress circulating currents in distributed IPOP three-level grid-connected converter systems,this paper proposes a circulating current suppression control method specific for this type of converters.A power equivalent model was established to simulate zero-sequence circulating currents,allowing for the analysis of harmonic components in circulating currents based on the carrier disposition modulation of injected zero-sequence voltage.The proportional complex integral(PCI)method is introduced for compensating for the zero-sequence modulation of each independent controller,to suppress low-frequency circulating currents between converters.Moreover,zero-sequence DC component suppression is integrated in the virtual speed governor link to achieve comprehensive control.The method proposed eliminated over 90%of the circulating current components in simulations and experiments,verifying the correctness and effectiveness of the zero-sequence circulating current modeling and suppression approach.关键词
构网型变流器/环流抑制/输入并联输出并联/分布式电源并网/建模/比例复数积分Key words
grid-connected converter/circulating current suppression/input-parallel output-parallel(IPOP)/interconnection of distributed resource/modeling/proportional complex integral(PCI)分类
动力与电气工程引用本文复制引用
胡亮,周振邦,梅文庆,王跃,付建国,刘亚云..分布式构网型并网变流器环流抑制控制方法[J].控制与信息技术,2024,(6):60-66,7.基金项目
国铁集团科技研究开发计划(N2022J008) （N2022J008）
