This paper proposes a multiple harmonics reduction method for the integrated on-board battery charging system of hybrid electric vehicles (REVs). The proposed system allows the starter generator and its drive inverter to operate as a battery charging system. The reconfiguration of the system results in the elimination of the conventional on-board charger (OBC), thereby reducing the system volume, weight, and manufacturing cost of REVs. In addition to the control method of the battery charging system, a harmonics compensation method is presented to improve the performance of the charging system. Different harmonics can be expressed as a unity variable in the synchronous reference frame by utilizing the phase sequence of the harmonics. The unified variable reduces the harmonic controller and simplifies the gain value selection. Simulation and experimental results verify the effectiveness of the integrated on-board battery charging system and its control method.
In this paper, a multiple harmonic reduction method for the integrated on-board battery charging system of HEVs is presented. The proposed charging system can be operated in both starter generator system mode and OBC system mode by utilizing the existing power system and additional relays. In other words, the conventional power converter can be removed, and thus, the total system volume and weight of HEVs can be reduced. To improve the THD of the output current and system efficiency, the multiple harmonic compensation method is introduced. The proposed harmonic reduction method, particularly, in 5th and 7th harmonic current compensation method shows an advantage in terms of the selection of the gain value. The simulation results using PSIM software and experimental results employing a prototype of 6.5 kW verify the effectiveness of the proposed charging system and its control methods. Acknowledgment This research was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT for First-Mover Program for Accelerating Disruptive Technology Development (NRF-2018M3C1B9088 457) and \u201cHuman Resources Program in Energy Technology\u201d of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea. (No.20194030202370).
