A novel complex state current controller for synchronous motor at very low switching frequency

作者：Wu Xiaojie^*; Yuan Qingqing; Fu Xiao; Dai Peng

来源：Proceedings of the CSEE, 2012, 32(3): 124-129.

• Complex state variables
• Cross-couplings
• Current controller
• Electrically excited synchronous motor
• Low switching frequency

High-power pulse width modulation (PWM) inverters for medium voltage applications operate at low switching frequency to keep the dynamic losses at permitted level. Also the sampling rate of the digital signal processing system is then low, which introduces considerable signal delays. These have adverse effects on the dynamics of the current control system and aggravate undesired cross-coupling between the stator current magnetization components and torque component. Due to low switching frequency, proportional integral (PI) regulator and PI with feed-forward compensation could not meet system requirements. To overcome this problem, a novel current controller with complex state variables was proposed based on the classical control tool, which also considering the delay introduced by the switching device and the time-discrete sampling. This kind of current controller with complex state variables can realize decoupling between current magnetization components and torque component as well as the perfect dynamic and steady response. The simulation and experimental results verify the availability of the novel current controller at low switching frequency.

• 出版日期2012
• 单位中国矿业大学（北京）