Accurate Neutral Current Control for Neutral Point Voltage Balancing in Three-Level Inverters Considering Digital Control and PWM Delay

被引：0
|
作者：
Lee, Hyun-Jun [1 ]
Kim, Sungmin [2 ]
Yoon, Young-Doo [1 ]
机构：
[1] Hanyang Univ, Dept Automot Engn, Seoul, South Korea
[2] Hanyang Univ, Dept Elect Engn, Ansan, South Korea
来源：
2019 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) | 2019年
关键词：
3-level inverter; multi-level converter; neutral current control; three-level inverter; voltage balancing; OSCILLATIONS;
D O I：
10.1109/ecce.2019.8912579
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：
This paper presents an accurate control method of neutral current for neutral point voltage balancing in three-level neutral point-clamped (NPC) inverters considering digital control and PWM delay. A stable and reliable operation of NPC inverters demands balancing in two DC capacitor voltages. Since the voltages are determined by the neutral current, the neutral current should be controlled accurately. The neutral current is synthesized with three-phase currents over a PWM cycle. Due to the digital control and PWM, their delays are included in the synthesis of the neutral current. These delays make the neutral current control inaccurate and affect voltage balancing control in DC link. In this paper, the delays were analyzed and compensated so that the accurate control of neutral current was achieved. Simulations and experimental results verify the effectiveness of the proposed method.
引用
收藏
页码：4795 / 4800
页数：6
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