The Study on Adaptive Switching Frequency Modulation for Integrated Power Converter System with Fuel Cell

The goal of this paper is to eliminate grid harmonic pollution and the more serious impact damage to the power devices of the fuel cell integrated converter system caused by the converter system's switching frequency uncertainty in the fuel cell microgrid integrated power supply system. We compare and analyze the control laws of traditional current-tracking converter control algorithms in this paper, revealing their benefits and drawbacks, and proposing a switching frequency control strategy for rectifier circuit optimization. The scheme combines the advantages of hysteresis loop control and the fixed switching frequency algorithm, and it reduces the difficulty of designing the filtering circuit. Furthermore, it improves the system's dynamic response and robustness while decreasing switching losses. After simulation analysis, the correctness and feasibility of this strategy are confirmed, and a test prototype of 10.0kW is built using a DSP TMS320F2812 processor.