考虑功率分配的混合供电型开绕组永磁同步电机过调制算法研究

doi:10.19595/j.cnki.1000-6753.tces.220629

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摘要针对混合供电型开绕组永磁同步电机系统因功率分配约束难以执行过调制的问题,提出一种考虑功率分配的新型过调制方法。首先分析了传统过调制方法对系统功率平衡的影响,定义了有功电压调制度,使过调制区在考虑功率分配的情况下得到更清晰的界定。为了平衡过调制区的功率分配以及保障不同调制区的平滑切换,基于重新界定的过调制区分别提出定子电压矢量和有功电压的过调制方法。实验结果验证了所提新型过调制方法的有效性和优越性。

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	柯伟煌
	孙丹
	马志豪
	年珩
	赵建勇

关键词 ：开绕组永磁同步电机, 浮地电容, 功率分配, 过调制

Abstract：Hybrid-inverter driven open winding permanent magnet synchronous motor (HI-OW-PMSM) system has the advantages of high power factor, high voltage utilization and high control accuracy. However, when the field oriented control strategy is implemented in the HI-OW-PMSM system, extra power distribution module is essential for the capacitor voltage constraint. The power distribution module limits the voltage ratio between two inverters. It leads to the problem that conventional overmodulation scheme is difficult to be executed in the HI-OW-PMSM system. To deal with this problem, a novel overmodulation scheme considering power distribution is proposed.
To prove the defects of conventional overmodulation scheme. The influence of the conventional overmodulation scheme on power balance of HI-OW-PMSM system is analyzed. The modulation index of the stator voltage and the active voltage are redefined, respectively, thus the overmodulation region is divided more accurately when considering the power distribution. On this basis, a novel overmodulation scheme considering power balance is proposed. To balance the power of HI-OW-PMSM system in the stator voltage overmodulation region and simultaneously smooth the switching process from the linear modulation region to the overmodulation region, a stator voltage overmodulation scheme is proposed and the reactive voltage is indirectly corrected. To further balance the power of HI-OW-PMSM system in the active voltage overmodulation region and simultaneously smooth the switching process from the stator voltage overmodulation region to the active voltage overmodulation region, an active voltage overmodulation scheme is proposed and the active voltage is corrected. Then, the proposed active voltage overmodulation scheme is derived to the case of six step modulation, thus the operation range of HI-OW-PMSM system is further extended.
In order to verify the superiority of the proposed method, comparative experimental studies among the conventional field oriented control strategy (strategy I), the conventional overmodulation strategy (strategy II) and the proposed overmodulation strategy (strategy III) are carried out in the experimental platform of the HI-OW-PMSM system. The static experimental results show that the critical speed of the proposed method is increased by about 14% and 9% when compared with strategy I and strategy II, respectively. Besides, the current THD of the proposed method is smaller than strategy I and strategy II over the whole operation range. The dynamic experimental results show that the switching process among linear modulation region, overmodulation and six step modulation region is smooth.
The following conclusions can be drawn from theoretical derivation and experimental analysis: 1) The power distribution cannot keep balance when conventional overmodulation method is directly applied to the HI-OW-PMSM system. 2) The active voltage modulation index has been defined, and more accurate boundary of the over-modulation region has been obtained when considering the power distribution constraint. 3) The stator voltage overmodulation method and the active voltage overmodulation method have been proposed, respectively, thus the balance of the power distribution in the overmodulation region and the smooth switching at the overmodulation boundary are realized. 4) Comparative experiments have been carried out, which verified that the proposed method has wider operation range and smaller current THD than the conventional overmodulation method.

Key words： Open winding permanent magnet synchronous motor floating capacitor power distribution overmodulation

PACS:

TM351

基金资助:国家自然科学基金（51877197）资助项目

引用本文:

柯伟煌, 孙丹, 马志豪, 年珩, 赵建勇. 考虑功率分配的混合供电型开绕组永磁同步电机过调制算法研究[J]. 电工技术学报, 0, (): 10-10. Ke Weihuang, Sun Dan, Ma Zhihao, Nian Heng, Zhao Jianyong. An Overmodulation Scheme Considering Power Distribution for Hybrid-Inverter Driven Open-Winding PMSM System. Transactions of China Electrotechnical Society, 0, (): 10-10.

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