A Repetitive Control Scheme for Circulating Current Suppression in Parallel Three-Level T-Type Inverters Under Unbalanced Conditions

被引:0
作者
Qin, Changwei [1 ]
Chen, Alian [1 ]
Xing, Xiangyang [1 ]
Du, Chunshui [1 ]
Zhang, Guangxian [1 ]
Zhang, Chenghui [1 ]
Ding, Wenlong [1 ]
机构
[1] Shandong Univ, Sch Control Sci & Engn, Jinan 250061, Shandong, Peoples R China
来源
2017 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) | 2017年
基金
中国国家自然科学基金;
关键词
Circulating current suppression; repetitive control; parallel 3LT(2)Is; unbalanced conditions; 3-PHASE BOOST RECTIFIERS; CONNECTION SYSTEM; CONTROL STRATEGY; PWM CONVERTER; DESIGN;
D O I
暂无
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Parallel three-level T-type inverters (3LT(2)Is) can increase power rating and reliability, but the circulating current problem will arise. Unbalanced conditions including unbalanced filter inductances and unbalanced grid voltage have negative effects on the operation of parallel 3LT(2)Is. This paper presents an improved repetitive control scheme for circulating current suppression in parallel 3LT(2)Is under unbalanced conditions. An average model of parallel 3LT(2)Is in dq0 reference frame is derived to analyze the circulating current. It can be seen that unbalanced filter parameters generate additional disturbance in zero-axis current system. A repetitive controller is designed to mitigate the disturbance caused by unbalanced filter parameters, and feed-forward terms are introduced to eliminate the remaining disturbances. The proposed control scheme can effectively suppress the circulating current in parallel 3LT(2)Is under unbalanced conditions. Experimental results are presented to demonstrate the effectiveness of the proposed scheme.
引用
收藏
页码:2846 / 2851
页数:6
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