Direct repetitive control of SPWM inverter for UPS purpose

作者：Zhang K^*; Kang Y; Xiong J; Chen J

来源：IEEE Transactions on Power Electronics, 2003, 18(3): 784-792.

DOI：10.1109/TPEL.2003.810846

• inverters
• pulse-width modulation
• repetitive control
• UPS

A novel repetitive controller directly combined with an open loop SPWM inverter is presented in this paper. To cope with the high-resonant peak of the open loop inverter that may cause instability, a zero-phase-shift notch filter other than the inverse transfer function of the inverter or a conventional second-order filter is incorporated in the controller. The proposed method has good harmonic rejection and large tolerance to parameter variations. To further reduce the steady-state error, low-pass-filter Q(z) algorithm is applied. DC bias problem is also taken into consideration and solved with the repetitive controller itself. The method is implemented with a digital signal processor and achieves low THD % (1.4%-1.7%) with nonlinear loads and fast error, convergence (3-5 fundamental periods). It proves to be a cost-effective solution for common UPS products where high-quality output voltage is more stressed than fast dynamic response.

• 出版日期2003-5
• 单位华中科技大学