电动汽车用高性能电流型trans-Z源逆变器特性研究

Current source inverter fed electric vehicle motor drive system with high performance

鉴于对电动汽车驱动系统运行温度及可靠性的严格要求,提出基于高性能电流型trans-Z源逆变器电机驱动系统,其拓扑是一种具有升-降压功能的单级逆变器,具有能量双向流动的特点。该系统能够克服传统驱动系统中缺点与不足:具有输出电压的任意升-降压功能;无需直流母线电容,提供正弦驱动电压,同时降低了硬件成本、提高了整个驱动系统的可靠性。文中详细分析了系统工作原理并推导出不同运行模式的等效电路,建立多自由度控制下直通零状态、开路零状态与直流链电压增益的映射关系;明确了系统在不同模式下的运行范围,量化逆变器输出电压与控制变量及功率因数之间的关系。最后通过实验验证了理论分析的正确性与实用性。

Considering the tougher standards on operation temperature and reliability, an electric vehicle （ EV） motor drive system based on current-fed trans-Z source inverter was presented. The inverter is a single-stage topology, which has Buck-Boost characteristic and achieves bidirectional power flow. The drive system can overcome the drawbacks of the traditional EV drives. It can realize output voltage range from 0 to any times of battery voltage,requires no DC bus capacitors, and provides sinusoidal voltage out-put to the motor, reduces the inverter cost and the failure rate. The different operation states and the e-quivalent circuits of the system were elaborated. The mapping relationship of multi-degrees of control freedom between duty ratios of open-zero states, non-open states and DC-link voltage gain was estab-lished. The available range for different operation modes was discussed, and ac voltage of inverter versus modulation index and power factor was clarified. A prototype of current-fed trans-Z-source inverter was built,the experimental results were presented to verify the theoretical analysis.