Control Strategy of Three-Port Bidirectional DC-DC Converter Based on Reactive Power Optimization
Huang Jun1,2, Fu Yanan1,2, Lü Xiaofei3, He Xuguo1,2, Huo Pengchong1,2
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China; 2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China; 3. NARI Technology Co. Ltd Nanjing 211106 China
Abstract The three-port bidirectional DC-DC converter (TP BDC) suffers high reactive power, narrow soft switching range, and low efficiency when the port voltages do not match. Thus, this paper proposes a control strategy for the efficiency optimization of TP BDC, which aims to minimize the reactive power. The voltage and current characteristics of each port are analyzed. On this basis, the power model of each port is established with the duty cycle control and phasor analysis. By constructing and solving the minimum reactive power optimization problem, the reactive power of TP BDC is reduced in a wide voltage range. Furthermore, this paper analyzes the soft switching characteristics of TP BDC under the optimal control. The selection strategy of optimal control parameters is subsequently proposed. The experimental results show that TP BDC has lower reactive power and wider soft switching range under wide voltage conditions by applying the proposed optimal control strategy. Consequently, the transmission efficiency of the converter is significantly improved under port voltage mismatch and light load conditions.
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2022, Vol. 37 
