Research On HIL Simulation Platform For Multiple Fuel Cells Hybrid Power System

The multiple fuel cells hybrid power system has a large number of modules and a complex structure,so it requires appropriate energy management strategies and control methods to ensure stable and efficient operation.In the development stage of the system controller,a lot of tests are required,especially the tests in the dynamic environment.Testing directly on real system not only easy to damage the elements and shorten the service life of fuel cell stacks,but also need to wait until the real system is fully completed.Therefore,there is a long research and development(R&D)cycle,and high costs.In this paper,the hardware in the loop(HIL)simulation technology was adopted for the design of system controller,and a HIL simulation platform was built to detect the performance of the controller in real time,obtain more real data information,shorten the development cycle,and save R&D costs.It provides a good experimental platform for the design and verification of system energy management strategies.First of all,the common hybrid form of the fuel cell system,and the electrical architecture of the multiple fuel cell stacks system are analyzed to determine the overall architecture of the multiple fuel cells hybrid power system.The simulation requirements of the HIL simulation platform for power electronic system,the advantages and disadvantages of FPGA and CPU as system simulators are analyzed.Combining the overall architecture of the hybrid system of multiple fuel cells,the overall structure of the HIL simulation platform based on FPGA+CPU architecture is proposed.When building multiple DC/DC model in FPGA,how to reduce the difficulty of power electronic programming as much as possible while improving the single-step simulation speed of the model is the key problem in this paper.To solve this problem,a parallel computing strategy based on modular modeling is proposed.This strategy is similar to building models in Simulink,which is convenient and concise.Furthermore,it is highly parallelizable to achieve a single-step simulation time of 0.1us.In order to integrate power loss into power electronics modeling and emulate the actual behavior of power electronic system vividly,loss equivalent models of different power electronic elements are established based on theoretical analysis and practical component analysis.For the energy management strategy of multiple fuel cells hybrid power system,the DP algorithm is adopted to design the optimal energy distribution method under the condition that the global operating conditions are known,and the PI control method is designed,so as to complete the design of the physical controller in the HIL simulation platform.Finally,the HIL simulation platform is built,and some experiments are carried out.The experimental results show that the HIL simulation platform has advantages of high speed and high accuracy,and it can meet the real-time validation effect of the controller.It provides a good platform for the design and verification of the multiple fuel cells hybrid power system's controller.The optimization control strategy verification experiment proves that the system's hydrogen consumption under the dynamic planning energy management strategy is lower,and it is more advantageous in terms of fuel economy.