| With the proposal of the "dual carbon" goal,the utilization of distributed renewable energy has received extensive attention.As the most effective way to utilize distributed energy,the research on the simulation method of microgrid has high practical value.The traditional simulation methods are divided into physical experiments and digital offline simulation.Both methods have great limitations.The former simulates the characteristics of microgrids through actual equipment.Although the accuracy is high,it is costly and dangerous;the latter uses mathematics to simulate the characteristics of microgrids.Modeling and simulating the characteristics of microgrid has the advantages of flexible structure and low cost,but its accuracy is limited by the modeling accuracy and cannot be co-simulated with actual hardware.Real-time simulation is a new type of simulation method,which combines the advantages of physical experiments and digital offline simulation,and simulates the characteristics of microgrid through mathematical modeling.The simulation results have a high degree of time determinism and can be connected with actual Hardware for hardwarein-the-loop(HIL)test.The real-time simulation data is compared with the theoretical data to verify the model accuracy.After that,the real-time simulation platform can be used to replace the real device,thereby reducing the experimental cost and improving the safety.Aiming at the limitations of physical experiments and digital offline simulation,this paper develops a real-time simulation platform for DC microgrid cogeneration based on NI-PXI.The capacity configuration of each component in the system is determined by the capacity optimization algorithm,and the hardware-in-the-loop test is carried out on the real Energy Manager System(EMS)controller,which verifies the effectiveness of the real-time simulation platform.The specific work content is as follows:(1)The structure of the real-time simulation platform is studied,and a Field Programmable Gate Array(FPGA)-CPU multi-step decomposition simulation method is formulated by comparing the operation speed of each controller,and a real-time simulation platform is built.(2)The simulation model of the DC microgrid combined heat and power system was built in simulink,including the photovoltaic generation model、battery model、 fuel cell model、 electrolysis model,and the hydrogen storage model.(3)On the basis of the above model,the system-level and equipment-level constraints are set,and the microgrid operation strategy is formulated.The goal is to minimize the annual cost such as initial construction cost and the annual operating cost.The PSO algorithm is used to optimizes the system capacity configuration,and determines the most economical capacity configuration to maintain the stable operation of the system.(4)Use the real-time simulation platform to perform hardware-in-the-loop tests on the real EMS controller,and verify the EMS controller’s fault response capability through a series of actions such as fault injection—detection and identification—alarm feedback—protection action—stable operation. |
