TY - GEN
T1 - Computation-Efficient Variable Angle Phase-Shifting PWM Method for Cascaded H-Bridge Converters
AU - Pan, Yiwei
AU - Sangwongwanich, Ariya
AU - Pereira, Thiago
AU - Yang, Yongheng
AU - Liserre, Marco
AU - Blaabjerg, Frede
PY - 2022/10/13
Y1 - 2022/10/13
N2 - When unbalances happen among the cells of a cascaded H-bridge (CHB) converter, variable angle phase-shifting (VAPS) pulse-width modulation (PWM) methods can be employed to improve the total harmonic distortion (THD) performance. However, as conventional methods are based on optimization algorithms which require a huge amount of evolutionary computations, the optimal carrier phase-shifting (PS) angles cannot be timely updated with a common standard digital signal processor (DSP) or microcontroller. During the period when the optimization is not finished, the THD of the total output voltage may significantly increase, bringing about higher power losses. Thus, a computation-efficient VAPS PWM method is proposed in this paper. With multiple calculation units (CUs) implemented in field programmable gate arrays (FPGAs), multiple calculations can be executed in parallel, significantly improving the optimization speed of the VAPS PWM method. Experimental results on a 4-cell CHB converter have demonstrated the effectiveness of the proposed method.
AB - When unbalances happen among the cells of a cascaded H-bridge (CHB) converter, variable angle phase-shifting (VAPS) pulse-width modulation (PWM) methods can be employed to improve the total harmonic distortion (THD) performance. However, as conventional methods are based on optimization algorithms which require a huge amount of evolutionary computations, the optimal carrier phase-shifting (PS) angles cannot be timely updated with a common standard digital signal processor (DSP) or microcontroller. During the period when the optimization is not finished, the THD of the total output voltage may significantly increase, bringing about higher power losses. Thus, a computation-efficient VAPS PWM method is proposed in this paper. With multiple calculation units (CUs) implemented in field programmable gate arrays (FPGAs), multiple calculations can be executed in parallel, significantly improving the optimization speed of the VAPS PWM method. Experimental results on a 4-cell CHB converter have demonstrated the effectiveness of the proposed method.
KW - Copper
KW - Digital signal processors
KW - Phase modulation
KW - Pulse width modulation
KW - Signal processing algorithms
KW - Total harmonic distortion
KW - Voltage
KW - Cascaded H-bridge Converter (CHB)
KW - harmonic mitigation
KW - phase-shifting (PS) modulation
KW - parallel computing
UR - http://www.scopus.com/inward/record.url?scp=85144067445&partnerID=8YFLogxK
U2 - 10.1109/ECCE50734.2022.9947380
DO - 10.1109/ECCE50734.2022.9947380
M3 - Article in proceeding
SN - 978-1-7281-9388-5
T3 - IEEE Energy Conversion Congress and Exposition
SP - 1
EP - 8
BT - Proceedings of the 2022 IEEE Energy Conversion Congress and Exposition (ECCE)
PB - IEEE
T2 - 2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
Y2 - 9 October 2022 through 13 October 2022
ER -