摘要
主要对双中点嵌位式三电平(3L-NPC)开绕组电机在反电动势谐波电压存在下机侧变流器中点平衡控制展开研究。首先建立了开绕组永磁同步电机的数学模型,通过PR调节器实现对电机反电动势谐波幅值和相位观测,使变流器调制波叠加同样幅值相位的零序分量进行零序电流抑制。补偿零序电压注入后改变了原有变流器调制波的正负关系,通过讨论叠加补偿电压后两组变流器调制波的工作范围,实现了基于反电动势谐波下的共直流母线中点电位平衡控制。最后完成了不同调制度、功率因数和反电动势谐波电压下的中点电位控制能力分析,仿真和实验结果验证了理论的正确性。
The motor converter neutral point balance control strategy of dual 3L - NPC open-end winding motor is proposed with back-EMF harmonic voltage. Firstly, the mathematic model of open-end wind PMSG is established. The value and phase of back-EMF harmonic is observed including PR controller and the zero sequence current is suppressed by adding the same value and phase zero voltage to the modulation waves. The positive and negative relationship of the modulation waves are changed after the compensation zero sequence voltage injection. By the discuss of the dual modulation waves working scope, the neutral point balance of common DC link based on zero sequence back-EMF is realized. Finally the neutral point control ability under different modulation, power factor and zero sequence back-EMF is analyzed. Simulation and experimental results verify the correctness of this theory.
出处
《电工技术学报》
EI
CSCD
北大核心
2016年第A02期183-193,共11页
Transactions of China Electrotechnical Society
基金
国家自然科学基金项目资助(51307158)
关键词
开绕组电机
反电动势谐波
零序电流
中点平衡控制
Open-end winding motor, back-EMF harmonic, zero sequence current, neutral point balance control
