Research On Improved Quadratic Combined High-gain Boost Converter

The rapid development of science and technology is accompanied by a greater demand for high-quality energy.The top priority in the energy field is the development and utilization of new energy.Renewable solar energy with key characteristics such as green and high efficiency has gradually become one of the representatives of new energy.DC-DC converters,as the connection parts between the front-end photovoltaic modules of the photovoltaic power generation system and the downstream power transmission devices,have increasingly become a hot research direction.In order to pursue high-performance DC-DC converters,researchers have proposed a variety of topological structures with superior performance.This article focuses on quadratic converters and seeks a class suitable for quadratic converters that can increase voltage gain and reduce voltage.High-efficiency converter for stress.First of all,based on the traditional quadratic Boost converter,in order to further improve the quality and efficiency,a unitized combination structure is proposed,which is split into two for the switched capacitor structure,so that it can be combined with the front-stage energy storage of the quadratic converter.The structure is reconnected and assembled.The topology of the converter is further analyzed in detail,and various performances are deduced.The horizontal comparison with the traditional structure and the converter of the same type of voltage doubling technology proves that this improved topology has higher voltage gain and efficiency,and lower voltage stress.Then,combined with the widely used coupling inductance voltage doubling technology,the previous quadratic converter single switch is modified,and the original inductance is magnetically coupled,so that the advantages of the two complement each other,and the combination optimization is completed in terms of structure and function,And analyze its C-CCM and C-DCM working modes in detail.This new structure ensures that the key performance voltage gain is greatly improved,and each unit complements each other to solve the impact problem and excessive energy existing in the traditional structure.Integrate through coupled inductors,double the voltage and reduce the unit volume;split the switch capacitor into units to boost the voltage more effectively and improve the structure of the coupled inductor.This new Boost converter is compared with the traditional quadratic Boost converter and other converters with the same improvement direction in a lateral performance comparison analysis,which confirms the converter’s high gain,high efficiency,and low voltage stress.Finally,the state-space averaging method is selected for calculation and analysis to complete the small-signal modeling of the quadratic switch-capacitor-coupled-inductor combination Boost converter,and the corresponding single-voltage loop PID compensator is designed.At the same time,complete the design of the overall hardware and software structure of the prototype,use the C Block module simulated by the PSIM software to complete the incremental PID control,and simulate and verify the switched-capacitor-coupled-inductor combination Boost converter.With reference to the overall system design of the converter and control,the experimental platform is used to build the physical object,and the results of the simulation and the experiment correspond to each other to support the correctness and feasibility of the previous theoretical analysis.The paper has 49 pictures,5 tables,and 63 references.