收稿日期: 2015-12-09
网络出版日期: 2017-10-30
基金资助
国家自然科学基金资助项目(51377102)
Minimum pulse width modulation of current harmonic for three-level inverter
Received date: 2015-12-09
Online published: 2017-10-30
三电平逆变器在中高压大功率交流系统中的应用越来越广泛, 但随着工作电压等级提高, 开关损耗也随之增大. 降低功率器件的开关频率可减少大容量逆变器的工作损耗, 同时也会带来电流谐波畸变较大的问题, 因此需要采用特殊的优化脉冲调制策略. 研究了一种二极管箝位三电平逆变器(three-level neutral point clamped, 3L-NPC)在低开关频率运行下的电流谐波最小脉宽调制(current harmonic minimum pulse width modulation, CHMPWM)分段同步调制方法. 通过理论计算得到分段同步调制方案, 采用遗传算法(genetic algorithm, GA)和序列二次规划(series quadratic programming, SQP)算法求取开关角, 最后通过仿真和实验验证了理论分析的正确性及CHMPWM 性能的优越性.
徐渊, 宋文祥, 冯九一, 杨影 . 三电平逆变器电流谐波最小PWM 方法[J]. 上海大学学报(自然科学版), 2017 , 23(5) : 690 -701 . DOI: 10.12066/j.issn.1007-2861.1724
Medium voltage transmission systems driven by a high power three-level inverter operating at low switching frequency can reduce switching losses of the power
device. This paper proposes a subsection synchronous current harmonic minimum pulse width modulation (CHMPWM) approach of neutral point clamped three-level (NPC-3L) inverter in low switching frequency operation. A subsection synchronous scheme is obtained with the theoretical calculation at the allowed maximum switching frequency. Genetic algorithm(GA) is used to get high-precision initial values. The expected switching angles are achieved with as sequential quadratic programming (SQP) algorithm. Validity of the theoretical analysis and superiority of CHMPWM are verified via simulation and experiments.
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