标题：Model Predictive Direct Current Control Strategy for Three-Level T-type Rectifier Under Unbalanced Grid Voltage Conditions
作者：Li, Xiaoyan; Zhang, Chenghui; Chen, Alian; Xing, Xiangyang; Zhang, Guangxian
作者机构：[Li, Xiaoyan; Zhang, Chenghui; Chen, Alian; Xing, Xiangyang; Zhang, Guangxian] Shandong Univ, Sch Control Sci & Engn, Jinan 250061, Shandong, Peoples 更多
会议名称：33nd Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
会议日期：MAR 04-08, 2018
来源：THIRTY-THIRD ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2018)
关键词：model predictive direct current control; unbalanced grid voltages;; three-level T-type rectifier; neutral-point balance
摘要：In order to reduce the total harmonic distortion (THD) of grid current and output power fluctuations under unbalanced grid voltages, a model predictive direct current control (MPDCC) strategy is proposed for three-level T-type rectifier. The reference current is used as the control objective and calculated by grid voltages and its 1/4 delaying value. Compared with the conventional method, computation of instantaneous active power and reactive power, extraction of positive and negative sequence, phase-locked loop (PLL), PWM modulation and inner current loop are avoided. In addition, the redundant P-type and N-type small vectors are selected to control the neutral-point balance simultaneously. The experimental results are presented to verify the feasibility and effectiveness of proposed MPDCC strategy.