TY - JOUR
T1 - Simplified PWM with Switching Constraint Method to Prevent Circulating Currents for Paralleled Bidirectional AC/DC Converters in Grid-Tied System Using Graphic Analysis
AU - Liao, Yi Hung
AU - Chen, Hung-Chi
PY - 2015/7/1
Y1 - 2015/7/1
N2 - In this paper, a simplified pulsewidth modulation with switching constraint control scheme is proposed to eliminate the circulating currents for bidirectional paralleled ac/dc converters in grid-tied system. The proposed control scheme can reduce the circulating currents and does not need additional current sensors and communication device among paralleled converters compared with conventional methods. Therefore, the paralleled system cost can be reduced. In addition, the current shaping and sharing between the paralleled converters can be well accomplished so that the overall performance of the paralleled converter system can be raised. Furthermore, the dc, ac, and self-generated circulating currents are clearly analyzed by graphics, and the synchronous circulating currents are first explored. Finally, a prototype system is constructed, and the proposed control scheme is implemented using a Spartan-3E XC3S250E FPGA. Both simulation and experimental results verify the validity of the proposed theory and control scheme.
AB - In this paper, a simplified pulsewidth modulation with switching constraint control scheme is proposed to eliminate the circulating currents for bidirectional paralleled ac/dc converters in grid-tied system. The proposed control scheme can reduce the circulating currents and does not need additional current sensors and communication device among paralleled converters compared with conventional methods. Therefore, the paralleled system cost can be reduced. In addition, the current shaping and sharing between the paralleled converters can be well accomplished so that the overall performance of the paralleled converter system can be raised. Furthermore, the dc, ac, and self-generated circulating currents are clearly analyzed by graphics, and the synchronous circulating currents are first explored. Finally, a prototype system is constructed, and the proposed control scheme is implemented using a Spartan-3E XC3S250E FPGA. Both simulation and experimental results verify the validity of the proposed theory and control scheme.
KW - Bidirectional ac/dc converter
KW - circulating currents
KW - current shaping/sharing
KW - simplified pulsewidth modulation (PWM)
KW - switching constraint control scheme
UR - http://www.scopus.com/inward/record.url?scp=84930216304&partnerID=8YFLogxK
U2 - 10.1109/TIE.2014.2352597
DO - 10.1109/TIE.2014.2352597
M3 - Article
AN - SCOPUS:84930216304
VL - 62
SP - 4573
EP - 4586
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
SN - 0278-0046
IS - 7
M1 - 6884862
ER -