| With the rapid development of industrial science and technology and the continuous improvement of production capacity,the contradiction between energy crisis and environmental protection is also deepening.New energy power generation technology based on solar energy and other renewable energy is an effective means to solve this problem,but affected by environmental factors,the output power of new energy generation is volatile,so it is necessary to add energy storage devices in the system.It is used to adjust the balance of energy supply and demand and improve power quality.Therefore,this paper focuses on the three-port converter applied to the new energy power generation system.In this thesis,a variety of isolated and non-isolated three-port topologies are compared and analyzed,and a non-isolated converter based on unidirectional Boost,bidirectional Buck-Boost and switched capacitor integration is finally selected,and the topology does not include coupling inductors,which makes its structure more compact.In addition,aiming at the requirements of easy control and fast response in industrial application scenarios,a relatively simple control strategy is designed.Firstly,this paper introduces the status of the three-port converter,analyzes the advantages and disadvantages of the three-port converter at home and abroad,and compares the proposed topology with the existing topology.It can be seen that the proposed topology can ensure high gain and low voltage stress on the device.Secondly,the working states of different modes are explained according to the timing diagram,and the parameters of passive devices are designed.In addition,the mode selection strategy and closed-loop control of the converter were designed.MATLAB/Simulink simulation results show that the proposed topology has high gain and the ability to adjust the energy supply and demand balance.In order to verify the effectiveness of the proposed converter,an experimental platform is built on the basis of hardware-in-loop device,and a control system based on TMS320F28335 DSP and XC6SLX9-2TQG144 C FPGA is designed.Based on the experimental platform,the step-up and energy regulation capabilities of the topology in this topic are verified,and the steady-state and dynamic performance of the converter in different modes are also validated.The correctness of theoretical analysis and the validity of the topology are verified according to the experimental results. |
