Publication
Jeong-Yul Bang, Dongho Choi, and June-Seok Lee, “Abnormal Voltage Suppression Method for Multi-sampled Cascaded H-bridge Inverters Based on Phase-shifted PWM,” The Transactions of the Korean Institute of Electrical Engineers, vol.73, no.10, pp. 1678-1686, Oct. 2024.
2024
PEEMS
-
Dec. 9, 2024
views
1. Authors: Jeong-Yul Bang, Dongho Choi, and June-Seok Lee
2. Title: Abnormal Voltage Suppression Method for Multi-sampled Cascaded H-bridge Inverters Based on Phase-shifted PWM
3. Journal: The Transactions of the Korean Institute of Electrical Engineers
4. Vol/no/pp: vol.73, no.10, pp. 1678-1686
5. Date: Oct. 2024
6. Abstract
: This paper proposes a suppression method for abnormal voltage caused by vertical crossing in phase-shifted PWM (PS-PWM)-based multi-sampled cascaded H-bridge (CHB) inverters. In PS-PWM-based CHB, multi-sampling is used to increase the bandwidth of the control loop and to improve transient and steady-state performance. However, in a multi-sampling, missed updates of PWM pulses occur due to vertical crossing, leading to an abnormal output voltage of the CHB. In this paper, the magnitude of CHB voltage error caused by vertical crossing is derived, and the influences of the carrier period on vertical crossing is analyzed in detail. Furthermore, to suppress the abnormal voltage, the occurrence of vertical crossing is predicted by utilizing the values of modulation waves and carriers at each sampling. Once a vertical crossing is predicted, the modulation wave is modulated to update the PWM pulse. The validity of the proposed method is verified by three-cell CHB experiment results.
- Dec. 11, 2024 Min-Seong Kim, Ju-Yeon Lee, and June-Seok Lee, “An Improved Carrier-Based Discontinuous PWM Method with Phase-Current THD Reduction for Vienna Rectifier,” The Transactions of the Korean Institute of Electrical Engineers, vol. 11, pp. 41868-41879, Dec. 2024.
- Jan. 23, 2024 Dongho Choi, June-Seok Lee, and Changmu Lee, "Study on Configuration and Output Voltage Control Method for Active Railway Traction Substation Based on Modular Multilevel Converter," Journal of the Korean Society for Railway, vol. 26, no. 12, pp. 921-931, Dec. 2023.