异步电机低开关频率的模型预测直接电流控制

doi:10.3969/j.issn.1007-2861.2013.06.018

上海大学学报(自然科学版) ›› 2013, Vol. 19 ›› Issue (6): 647-653.doi: 10.3969/j.issn.1007-2861.2013.06.018

异步电机低开关频率的模型预测直接电流控制

宋文祥, 阮智勇, 朱洪志, 周杰

上海大学机电工程与自动化学院, 上海200072

出版日期:2013-12-30 发布日期:2013-12-30
通讯作者: 宋文祥(1973—), 男, 副教授, 博士, 研究方向为电机驱动控制及应用、新型电力电子变换. E-mail:wxsong@shu.edu.cn
作者简介:宋文祥(1973—), 男, 副教授, 博士, 研究方向为电机驱动控制及应用、新型电力电子变换.
基金资助:
国家自然科学基金资助项目(51377102); 台达环境与教育基金会“电力电子科教发展计划”资助项目(DREG2013009)

Model Predictive Direct Current Control of Induction Motor at Low Switching Frequency

SONG Wen-xiang, RUAN Zhi-yong, ZHU Hong-zhi, ZHOU Jie

School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200072, China

Online:2013-12-30 Published:2013-12-30

摘要/Abstract

摘要： 针对二极管箝位型(neutral point clamped, NPC) 三电平逆变器驱动异步电机的低开关频率控制, 提出了一种新颖的模型预测直接电流控制(model predictive direct current control, MPDCC) 方法. 基于推导的传动系统离散时间内部预测模型, 控制器预测了每个容许开关位置对应的电流输出轨迹、外推输出轨迹, 并根据评估平均开关频率的价值函数在线滚动优化实时求取最优开关矢量, 使得逆变器平均开关频率最小化, 且保持电流轨迹在给定的滞环范围内. 相对于已有的单步预测电流控制方法, 该方法在保持基本相同谐波性能的同时显著降低了开关频率. 仿真结果表明, 低开关频率模型预测电流控制算法可将三电平逆变器的平均开关频率降低至500 Hz 以下, 并且具有较理想的电流谐波畸变和动态响应性能.

关键词: 低开关频率, 模型预测控制, 三电平逆变器, 异步电机, 直接电流控制

Abstract: This paper proposes a model predictive direct current control (MPDCC) method for low switching frequency control of induction motors fed by a neutral point clamped (NPC) three-level inverter. Based on a discrete-time internal predictive model of the drives, the controller predicts future trajectories of stator current
for each admissible switching position, extrapolates the output trajectories and selects the optimal switch vector according to a receding horizon policy of the cost function that evaluates the average switching frequency of inverter. This makes the switching frequency minimized and the predicted current trajectories within its specified hysteresis bounds. Compared with the established one-step predictive current control, the proposed scheme can reduce switching frequency significantly, and keeps similar harmonic characteristics. Simulation results show that the switching frequency of the three-level inverter can be dropped below 500 Hz. A low harmonic distortion rate of three-phase current is achieved, and fast transient response can be realized by using the proposed scheme.

Key words: direct current control (DCC), induction motor, low switching frequency, model predictive control (MPC), three-level inverter

中图分类号:

TM 343

宋文祥, 阮智勇, 朱洪志, 周杰. 异步电机低开关频率的模型预测直接电流控制[J]. 上海大学学报(自然科学版), 2013, 19(6): 647-653.

SONG Wen-xiang, RUAN Zhi-yong, ZHU Hong-zhi, ZHOU Jie. Model Predictive Direct Current Control of Induction Motor at Low Switching Frequency[J]. Journal of Shanghai University（Natural Science Edition）, 2013, 19(6): 647-653.

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异步电机低开关频率的模型预测直接电流控制

Model Predictive Direct Current Control of Induction Motor at Low Switching Frequency

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