基于模型预测的简化定频PWM三电平整流器控制策略
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李飞(1982-),男,工学博士,讲师,主要从事电力电子变换器研究;E-mail:lifei_cumt@126.com

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国家自然科学基金青年基金(51707086);江苏省高等学校自然科学研究项目(19KJB470020)


Research on control strategy of simplified fixed frequency PWM three-level rectifier based on model prediction
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    摘要:

    对于三相电压源型 PWM 整流器而言,有限控制集模型预测控制(FCS-MPC)是一种新颖的高性能控制算法。但对于三电平 PWM 整流器而言,存在计算量巨大和开关频率不固定等缺点。在此背景下,提出一种基于模型预测控制的简化定频 PWM 调制策略。该算法无需对三电平27个矢量进行轮询计算,直接通过求取含有电流偏差和中点电位偏差的价值函数获得最优目标电压矢量,大大减少了计算量。实验结果表明,提出的简化调制策略能够实现 NPC三电平整流器定频控制和中点电位调节,并且具有良好的动、静态性能。

    Abstract:

    For three-phase voltage-based PWM converters, finite set control model predictive current control (FCS-MPC) is a kind of novel and high-performance control strategy. However, there exist the disadvantages of large amount of calculations and unfixed switching frequency for NPC three-level converters. Thus, in order to overcome the disadvantages, a simplified fixed switching frequency PWM strategy based on MPC is proposed in this paper. The algorithm does not need to perform rolling calculations on 27 three-level vectors, and directly obtains the optimal target voltage vector by calculating the cost function containing the current deviation and the midpoint potential deviation, which greatly reduces the amount of calculation. Experimental results show that the proposed simplified modulation strategy can achieve fixed-frequency control and mid-point potential adjustment of the NPC three-level converters, and has good dynamic and static performance.

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李飞,刘战,赵强,王贵峰,李春杰,夏正龙.基于模型预测的简化定频PWM三电平整流器控制策略[J].电力科学与技术学报,2021,(2):116-123. Li Fei, Liu Zhan, Zhao Qiang, Wang Guifeng, Li Chunjie, Xia Zhenglong. Research on control strategy of simplified fixed frequency PWM three-level rectifier based on model prediction[J]. JOURNAL OF EIECTRIC POWER SCIENCE AND TECHNOLOGY,2021,(2):116-123.

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  • 在线发布日期: 2021-05-08