| Title |
Operation Characteristics of Direct Power Controlled PWM Converter under Unbalanced Power Source |
| Authors |
남길동(Gil-Dong Nam) ; 김동일(Dong-Il Kim) ; 문상필(Sang-Pil Mun) ; 황정원(Jeong-Won Hwnag) ; 유의정(Yeoi-Joung Ryu) ; 우경일(Kyung-Il Woo) |
| DOI |
https://doi.org/10.5370/KIEEP.2023.72.4.243 |
| Keywords |
direct power control; PWM converter; smoothing capacitor; unbalanced power source; subharmonic PWM converter |
| Abstract |
This paper discusses operation characteristics of a direct power controlled PWM converter. The key of this strategy is a direct selection of switching modes on the basis of instantaneous errors of active and reactive power. In addition, this paper presents a theoretical analysis on relation between the instantaneous power and the switching modes, which is essential to compose a switching mode table. The feature of this method is high speed response owing to direct instantaneous power control with relay elements; hence a DC-bus smoothing capacitor can be minimized. Controllability of the proposed technique was examined through various experimental tests, and it was confirmed that the maximum total input power factor and efficiency were 99.6[%] and 96.6[%] over a load power range from 400 to 1.6[kW], respectively. Moreover this paper discusses operation characteristics of the direct power controlled PWM converter, compared with a conventional subharmonic PWM converter, under unbalanced power source condition.
Experimental data prove that the proposed technique achieves more than 95[%] power factor and less than 6[%] DC bus ripples. |