An improved deadbeat control for UPS using disturbance observers

被引:280
作者
Mattavelli, P [1 ]
机构
[1] Univ Udine, DIEGM, Dept Elect Mech & Management Engn, I-33100 Udine, Italy
关键词
digital control; disturbance observer; uninterruptible power supplies (UPSs);
D O I
10.1109/TIE.2004.837912
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
A digital control technique for the inverter stage of uninterruptible power supplies is proposed, which is based on a predictive regulator on both output voltage and inductor current. Its aim is to achieve a deadbeat dynamic response for the controlled variables (output voltage and inverter current). Besides the linear state feedback which allocates system poles at the origin so as to achieve deadbeat response for all state variables, the use of a disturbance observer for the estimation of the load current and of any other source of errors (such as dead-times, parameter, and model mismatches) is investigated. The proposed solution is able to guarantee a fast dynamic response and also a precise compensation of any source of unpredictable disturbance. Moreover, with a proper design of observer parameters, it is possible to reduce control sensitivity to model uncertainties, parameter mismatches, and noise on sensed variables, which usually characterizes existing deadbeat control techniques. Finally, the control algorithm is quite simple and requires only the measurements of the output voltage and inductor current. Experimental results on a single-phase 2 kVA prototype show the effectiveness of the proposed approach.
引用
收藏
页码:206 / 212
页数:7
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