| 李善寿,朱世璠,谢陈磊.基于改进三矢量的PWM整流器模型预测直接功率控制方法[J].安徽建筑大学学报,2024,32(): |
| 基于改进三矢量的PWM整流器模型预测直接功率控制方法 |
| Model Predictive Direct Power Control Method for PWM Rectifiers Based on Improved Three Vectors |
| 投稿时间：2023-12-07 修订日期：2024-04-03 |
| DOI： |
| 中文关键词: T型三电平 PWM整流器、模型预测直接功率控制 最优电压矢量序列 共模电压抑制 |
| 英文关键词: T-type three level PWM rectifier, Model prediction direct power control Optimal voltage vector sequence Common mode voltage suppression |
| 基金项目:国家重点研发计划课题（课题编号：2023YFC3807704）； |
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| 中文摘要: |
| 传统模型预测直接功率控制由于需要在27个电压矢量中进行遍历计算，每个控制周期仅输出一个电压矢量，因此具有开关频率不恒定、计算量大、共模电压大等问题。为解决上述问题，设计了一种三矢量模型预测直接功率控制方法，并搭建T型三电平PWM整流器5KW实验样机进行验证。首先，该方法在单个控制周期内输出三个电压矢量，确保在多个连续采样周期中不重复使用相同的电压矢量，从而保持恒定的开关频率；其次，在两相静止坐标系中，通过划分空间电压矢量图，通过两个代价函数确定包含电网电压矢量的扇区，将模型预测遍历次数从传统的27次降低至10次，减小了计算量；第三，去除两个冗余零矢量PPP与NNN，将共模电压抑制在Udc/3以内。仿真与实验结果表明，该方法使得整流器能够精准的追踪直流母线电压给定值，且在功率追踪上具备良好的动态和稳态性能。 |
| 英文摘要: |
| Conventional model predictive direct power control (C-MPDPC) encounters challenges, such as non-constant switching frequency, substantial computational overhead, and elevated common-mode voltage, due to the necessity of traversing through 27 voltage vectors, with only one voltage vector output per control cycle. To address these issues, a three-vector model predictive direct power control method was devised and validated through the construction of a 5 kW experimental prototype of a T-type three-level PWM rectifier. Primarily, this method outputs three voltage vectors within a single control cycle, ensuring the avoidance of repeated usage of the same voltage vector in multiple consecutive sampling periods, thereby maintaining a constant switching frequency. Secondly, within the two-phase stationary coordinate system, by partitioning the space voltage vector diagram and utilizing two cost functions, the sector containing the grid voltage vector is determined. This results in a reduction of the model predictive iterations from the conventional 27 to 10, effectively diminishing computational burden. Thirdly, the elimination of two redundant zero vectors PPP and NNN constrains the common-mode voltage within Udc/3. Simulation and experimental results demonstrate that this method enables the rectifier to precisely track the setpoint of the DC link voltage. Moreover, it exhibits commendable dynamic and steady-state performance in power tracking. |
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