DocumentCode :
2978836
Title :
A new digital control method for high performance 400 Hz ground power unit
Author :
Li, Zixin ; Wang, Ping ; Zhu, Haibin ; Li, Yaohua ; Tan, Longcheng ; Chen, Yonggang ; Gao, Fanqiang
Author_Institution :
Inst. of Electr. Eng., Chinese Acad. of Sci., Beijing
fYear :
2008
fDate :
1-3 Sept. 2008
Firstpage :
515
Lastpage :
520
Abstract :
In digital control, the one-sample delay for computation which is often ignored in 50/60 Hz cases has great impact on the performance of a 400 Hz ground power unit (GPU). Taking the delay into account, a detailed proof that it is very hard and even impossible for 400 Hz GPU to maintain a low THD content in the output voltage using the conventional inductor, capacitor or load current feedback based single-loop or double-loop control is given. A new primary-plus-resonant-controller method suitable for fixed-point DSP without modifying the existing single-loop or double-loop control topology is presented. With the new approach, the computation delay is not compensated, which means that complex computation will be avoided. Meanwhile, the relationships between the discrete realization method in other literatures and the zero order hold method for resonant controllers have also been discussed. Two types of tests on a 90-kVA 400 Hz GPU prototype based-on a 16-bit fixed-point DSP show satisfactory performance of the new method feeding linear / nonlinear load.
Keywords :
digital control; digital signal processing chips; power supply circuits; resonant power convertors; digital control method; discrete realization method; fixed-point DSP; frequency 400 Hz; ground power unit; primary-plus-resonant-controller method; resonant controllers; zero order hold method; Capacitors; Delay; Digital control; Digital signal processing; Inductors; Output feedback; Resonance; Testing; Topology; Voltage control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Electronics and Motion Control Conference, 2008. EPE-PEMC 2008. 13th
Conference_Location :
Poznan
Print_ISBN :
978-1-4244-1741-4
Electronic_ISBN :
978-1-4244-1742-1
Type :
conf
DOI :
10.1109/EPEPEMC.2008.4635318
Filename :
4635318
Link To Document :
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