首页|高速磁浮背靠背三电平ANPC变流器中点电压偏移机理与协同控制策略

高速磁浮背靠背三电平ANPC变流器中点电压偏移机理与协同控制策略

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高速磁浮交通牵引变流器采用24 MVA背靠背三电平有源中点钳位拓扑,其中两台整流器和两台逆变器共用直流母线.该文分析整流侧和逆变侧在不同功率因数下中点电压(neutral point voltage,NPV)偏移机理及不同电压矢量对NPV 的具体影响.据此,针对高速磁浮逆变器并联和串联两种模式,建立NPV偏移模型,得到在调制比和功率因数同时变化时NPV的可控区域.为在全速范围保证NPV平衡,提出一种基于平移调制波的协同控制策略.为减轻整流器功率因数和调制比对NPV的影响,采用一种具有相电压半波对称性的载波脉宽调制,并证明其具备NPV自平衡能力.仿真和硬件在环实验表明,所提策略具有NPV恢复到平衡状态所需时间短、可控范围大等优点,可在高速磁浮全速工况下保证NPV平衡.
Neutral Point Voltage Offset Mechanism and Cooperative Control Strategy of High-speed Maglev Back-to-back Three-level ANPC Converter
The 24 MVA back-to-back three-level active neutral point clamped(3L-ANPC)converter is adopted for high-speed maglev.The DC bus is shared by two rectifiers and two inverters.In this paper,under various power factors,the offset mechanisms of neutral point voltage(NPV)at the rectifier side and inverter side are analyzed.The specific effects on the NPV of different voltage vectors are also analyzed.On this basis,to obtain the controllable area of the NPV when the modulation ratio and power factor both change,accordingly,the NPV offset models are established for the parallel and series modes of high-speed maglev inverters.To ensure the NPV balance in the full speed range,a cooperative control strategy based on shifting the modulation wave is proposed.To reduce the influence of the rectifier power factor and modulation ratio on the NPV,carrier-based pulse width modulation(CBPWM)with half-wave symmetry of phase voltage is adopted.It is proven that it has the self-balancing ability of the NPV.Simulation and hardware-in-the-loop experiments show that the proposed strategy has the advantages of a shorter time for the NPV to return to equilibrium,a larger controllable range,etc.Moreover,the NPV balance can be guaranteed for high-speed maglev operations at full speed.

high-speed maglev trainback-to-back three-level active neutral point clamped(3L-ANPC)convertercommon DC busneutral point voltage(NPV)balancecarrier-based pulse width modulation(CBPWM)cooperative control

赵牧天、葛琼璇、朱进权、赵鲁、张波、王珂

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中国科学院大学,北京市 石景山区 100049

电力电子与电气驱动重点实验室(中国科学院电工研究所),北京市 海淀区 100190

高速磁浮 背靠背三电平有源中点钳位变流器 共直流母线 中点电压平衡 载波脉宽调制 协同控制

国家重点研发计划项目国家自然科学基金项目

2016YFB1200602-2051907188

2024

10.13334/j.0258-8013.pcsee.223426

中国电机工程学报
中国电机工程学会

中国电机工程学报

CSTPCD北大核心
影响因子：2.712
ISSN：0258-8013
年,卷(期)：2024.44(5)
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