Minimum duty-cycle point tracking method and its applications in a new system with one five-leg inverter and two three-phase machines

作者：Wang Wei^*; Cheng Ming; Zhang Bangfu; Zhu Ying; Ding Shichuan

来源：Proceedings of the CSEE, 2013, 33(3): 117-124.

• Control methods
• DC-bus voltages
• Duty cycle
• Entire system
• Fault-tolerant strategy
• Five-leg inverter
• ITS applications
• Line voltage
• Operation mode
• Point tracking
• Power switches
• Single
• machines
• Space vector pulse width modulation
• Three phase
• Three-phase machines
• Total torque
• Two machines
• Two-machine systems
• Zero vectors

To reduce the number of power switches, a new control method focused on a new system with one five-leg inverter and two three-phase machines is proposed. Firstly, three phase duty cycles for each machine is calculated using space vector pulse width modulation (SVPWM) method; then, considering line voltages, minimum duty cycles are obtained, which meet the requirement of the entire system; finally, according to the equal principle of two zero vectors, the final values of five duty cycles are determined to control two machines. Due to the tracking of minimum duty cycles, the minimum duty cycles of all legs can be obtained. Based on the performances of the new system, two possible operation modes are introduced. In the first operation mode, the velocities of two machines are complementary, which makes the dc bus voltage requirement for two-machine systems and single machine systems similar. In the second operation mode, the new system is a fault-tolerant strategy, in which the velocity is reduced and the total torque keeps unchanged. The control method and the two possible operation modes are verified by experimental results.

• 出版日期2013
• 单位东南大学