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学者姓名：禹春敏
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Abstract ：
The three-level multi-phase drive system combines the advantages of multi-phase motors and three-level inverters. However, midpoint voltage imbalance and excessive zero-sequence current exist. Midpoint voltage imbalance can lead to output voltage distortion, while excessive zero-sequence current can cause distortion of the stator current and increased losses. Direct torque control (DTC) requires minimal dependence on motor parameters, with a simple algorithm and strong adaptability to load changes. However, research based on DTC theory is still relatively rare. The symmetrical six-phase permanent magnet synchronous motor (PMSM) has high efficiency, a fast response rate among multi-phase motors, and superior fault tolerance. Therefore, this paper proposes a DTC strategy for a symmetrical six-phase PMSM powered by a T-type three-level inverter to balance midpoint voltage and suppress zero-sequence current. Firstly, by using a spatial vector projection method to remove the redundant switching states in the switching state, the switching states are reduced from 729 to 189. Secondly, based on the three-phase PMSM-DTC structure powered by the two-level inverter, the scheme synthesizes four voltage vectors to meet the control requirements on the six-phase axis using the simplified switching state. In addition, by combining flux linkage and torque hysteresis comparator with simple sector division, the axis of the optimal voltage vector is determined, and the midpoint voltage and zero-sequence current control plane are constructed. The sector where the system is located in the control plane is judged. According to the polarity of the winding phase current iy of the optimal voltage vector, the optimal voltage vector selection is realized, and the optimal switch vector table of DTC is further constructed. Steady-state comparative experiments are conducted. Compared to the traditional approach, the proposed method maintains a balanced midpoint voltage, effectively suppresses zero-sequence current to approximately 0 A, and significantly sinusoidalize phase current. Steady-state running experiments are conducted at different speeds and loads to investigate the steady-state performance of the motor. The results show that zero-sequence current is effectively suppressed to approximately 0 A, and the midpoint voltage remains balanced. Speed step and sudden load change experiments are performed to validate the dynamic performance of the motor. The results demonstrate that the zero-sequence current can still be well controlled around 0 A, even during speed steps and sudden load changes. Although the midpoint voltage may fluctuate slightly, it can be quickly adjusted to a balanced state. The following conclusions can be drawn. This paper proposes a DTC strategy for a symmetrical six-phase PMSM powered by a T-type three-level inverter, addressing the control of |ψs| and Te, midpoint voltage balance, and zero-sequence current suppression. © 2024 China Machine Press. All rights reserved.
Keyword ：
direct torque control direct torque control midpoint voltage balance midpoint voltage balance six-phase permanent magnet synchronous motor six-phase permanent magnet synchronous motor T-type three-level inverter T-type three-level inverter zero sequence current suppression zero sequence current suppression
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| GB/T 7714 | Huang, D. , Zhou, Y. , Qu, A. et al. Six-Phase PMSM-DTC Control with Midpoint Voltage Balance and Zero-Sequence Current Suppression Powered by T-Type Three-Level Inverter; [具有中点电压平衡与零序电流抑制的T 型三电平逆变器供电六相 PMSM-DTC] [J]. | Transactions of China Electrotechnical Society , 2024 , 39 (20) : 6371-6385 . |
| MLA | Huang, D. et al. "Six-Phase PMSM-DTC Control with Midpoint Voltage Balance and Zero-Sequence Current Suppression Powered by T-Type Three-Level Inverter; [具有中点电压平衡与零序电流抑制的T 型三电平逆变器供电六相 PMSM-DTC]" . | Transactions of China Electrotechnical Society 39 . 20 (2024) : 6371-6385 . |
| APA | Huang, D. , Zhou, Y. , Qu, A. , Yu, C. . Six-Phase PMSM-DTC Control with Midpoint Voltage Balance and Zero-Sequence Current Suppression Powered by T-Type Three-Level Inverter; [具有中点电压平衡与零序电流抑制的T 型三电平逆变器供电六相 PMSM-DTC] . | Transactions of China Electrotechnical Society , 2024 , 39 (20) , 6371-6385 . |
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Abstract ：
在三电平六相电机驱动系统中,存在中点电压不平衡及零序电流导致定子电流畸变等问题.为此,该文针对T型三电平逆变器供电的六相永磁同步电机,提出一种具有中点电压平衡与零序电流抑制功能的直接转矩控制(DTC)策略.为实现DTC的快速构建,该策略基于两电平三相电机DTC结构,利用精简后的开关状态,在六相绕组轴线上分别合成满足控制要求的 4 个电压矢量,然后通过两个滞环比较器结合简单的扇区划分,确定最优电压矢量所在轴线,同时构建中点电压与零序电流控制平面,并对系统在控制平面所处扇区进行判断.在此基础上,根据最优电压矢量所在绕组的相电流iy的极性,实现最优电压矢量的选择,并进一步构建DTC最优开关矢量表.最后,通过实验结果验证了所提控制策略的可行性和有效性.
Keyword ：
T型三电平逆变器 T型三电平逆变器 中点电压平衡 中点电压平衡 六相永磁同步电机 六相永磁同步电机 直接转矩控制 直接转矩控制 零序电流抑制 零序电流抑制
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| GB/T 7714 | 黄德猛 , 周扬忠 , 屈艾文 et al. 具有中点电压平衡与零序电流抑制的T型三电平逆变器供电六相PMSM-DTC [J]. | 电工技术学报 , 2024 , 39 (20) : 6371-6385 . |
| MLA | 黄德猛 et al. "具有中点电压平衡与零序电流抑制的T型三电平逆变器供电六相PMSM-DTC" . | 电工技术学报 39 . 20 (2024) : 6371-6385 . |
| APA | 黄德猛 , 周扬忠 , 屈艾文 , 禹春敏 . 具有中点电压平衡与零序电流抑制的T型三电平逆变器供电六相PMSM-DTC . | 电工技术学报 , 2024 , 39 (20) , 6371-6385 . |
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