Direct repetitive control of SPWM inverter for UPS purpose

被引:317
作者
Zhang, K [1 ]
Kang, Y [1 ]
Xiong, J [1 ]
Chen, J [1 ]
机构
[1] Huazhong Univ Sci & Technol, Dept Elect Engn, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
inverters; pulse-width modulation; repetitive control; UPS;
D O I
10.1109/TPEL.2003.810846
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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.
引用
收藏
页码:784 / 792
页数:9
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