Research On Hybrid Energy Storage System Based On Fuel Cell

With the introduction of the concept of green ships and the improvement of related technical fields,the integrated power system of ships keeps developing and innovating towards high energy usage and low pollutant emissions.It has become a hot research topic for scholars from various countries,especially in the field of ship power distribution system with fuel cell as the main power source.Among them,the fuel cell-based hybrid power supply system is the core device,not only to satisfy the operating energy and voltage level required by the ship power grid,but also to ensure the power supply quality of the ship power grid.Therefore,this article takes the fuel cell-based hybrid power supply system as the research object to discuss related technologies.The fuel cell-based hybrid power supply system studied in this subject is composed of a high gain boost DC/DC converter and a bidirectional DC/DC converter.High gain boost DC/DC converter adopts a new topology;the bidirectional DC/DC converter adopts the non-isolated bidirectional Buck-Boost converter topology.The specific research content is as follows:In order to improve the problems of low voltage gain and large loss of boost converters for fuel cells,this paper proposes a new type of high gain boost DC/DC converter.The converter first uses coupled inductors and switched capacitors to achieve high voltage gain;with the help of an active clamp circuit,the soft switching of the switch tube is realized;finally,the auxiliary inductor is introduced to improve the problem of magnetic bias saturation in the coupled inductor under high power conditions.In order to improve the slow dynamic response of the bidirectional DC/DC converter under PI strategy control and the large current fluctuations under the traditional model predictive control,an improved model predictive control method is adopted.the model predictive control has excellent dynamic response capabilities,the continuous stability of the entire control system is achieved by traversing the duty cycle of the switch tube to optimize,and the problem of large current fluctuations is improved.In order to ensure that the hybrid power supply system can accurately and timely make corresponding adjustments in the face of different working conditions,this article classifies and summarizes these working conditions,and designs different energy management logics for different working conditions in the macro operation strategy,and in the micro specific control algorithm The original control algorithm is improved and optimized accordingly,so that the entire hybrid power supply system can work normally and accurately according to the expected strategy under different working conditions.Finally,a hardware experimental platform is built for experimental test verification,and the theoretical analysis,simulation results and experimental waveforms are comprehensively compared together to verify the correctness and effectiveness of the fuel cell-based hybrid power supply system designed in this paper.