Affiliation:
1. China Electric Power Research Institute, Beijing 100192, China
2. College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China
Abstract
A triple-active bridge (TAB) can be used as a power conversion unit in a three-port DC energy router (DCER) such as a triple-active bridge-based DC energy router (TAB-DCER). The operational loss of a TAB can be seen as a key factor affecting the efficiency of a TAB-DCER. However, the RMS value of the inductor current of the TAB-DCER increases under single-phase shift (SPS) control, and this greatly increases the system operating losses. The use of phase-shifted plus PWM (PS-PWM) control can reduce the RMS value of the inductor current, but its mathematical model is complex, and involves difficult calculations. To address this problem, in the study reported here, we developed an optimal control strategy for the RMS value of the inductor current based on TAB-DCER. First, the working principle of a TAB-DCER under PS-PWM control was analyzed, and a circuit decomposition model was established. Second, the operating modes under PS-PWM control were analyzed, and corresponding expressions of port power and the RMS value of the inductor current were obtained. Third, an optimized mathematical model of the sum of squares of the RMS value of the inductor current of the TAB-DCER was constructed. Finally, a genetic algorithm was used to solve the mathematical model and derive the optimal phase shift angle; this resulted in a lower RMS value of the inductor current in the TAB-DCER and reduced the system operating losses. The simulation and experimental results show that the TAB-DCER used in the present study can reduce operating losses, improve system efficiency, and deliver coordinated power control.
Funder
Science and Technology Project of State Grid Corporation of China
Reference24 articles.
1. A family of multiport buck-boost converters based on DC-link-Inductors (DLIs);Wu;IEEE Trans. Power Electron.,2015
2. Autonomous operation of hybrid microgrid with AC and DC subgrids;Loh;IEEE Trans. Power Electron.,2013
3. Pham, V.-L., and Wada, K. (2020). Applications of Triple Active Bridge Converter for Future Grid and Integrated Energy Systems. Energies, 13.
4. A DC Power Distribution System in a Data Center Using a Triple Active Bridge DC-DC Converter;Yu;IEEJ J. Ind. Appl.,2018
5. Yu, Y., Masumoto, K., Wada, K., and Kado, Y. (2017, January 3–7). Power Flow Control of a Triple Active Bridge DC-DC Converter Using GaN Power Devices for a Low-Voltage DC Power Distribution System. Proceedings of the 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017—ECCE Asia), Taiwan, China.