Research On Improved High Gain Three-Level Converter Based On Double Coupled Inducter

The development and use of clean renewable energy is a hot issue in today's society to address the global energy crisis and ecological problems.It is imperative to use energy sources such as solar energy and wind energy to alleviate the energy crisis,while power electronic converters are distributed.The microgrid system occupies an important position.How to reduce the converter cost and meet the demand of high gain has become the focus of current research.This paper proposes an improved high-gain three-level converter based on double coupled inductor(An Improved High Gain Three-level Converter Based on Double Coupled Inductor-HGTLDC).Compared with the comparison topology in the article,the HGTLDC converter has the following advantages:(1)The q-Z source network and the dual-coupling inductor structure can improve the boosting capability and increase the power level.(2)The reference of the three-level structure and the clamp diode greatly reduces the voltage level of the switching device.(3)The voltage stress of the storage capacitor is extremely low,and the excitation current of the primary winding of the coupled inductor is reduced.Firstly,the paper analyzes the derivative process of HGTLDC converter,analyzes the circuit structure and operation mechanism of the traditional boost converter and several existing high gain boost converters.By adjusting the internal structure of the coupled inductor boost module,the use The storage capacitor replaces the diode in the switching inductor,and clamps the diode in parallel with the secondary side of the coupling winding,and then derives the HGTLDC converter,and derives the voltage gain formula under ideal conditions,and calculates the voltage and current stress of the internal components of the converter.It provides a theoretical reference for HGTLDC circuit parameter design and device selection.Then the operation mechanism of HGTLDC in CCM working mode is analyzed in detail,and the circuit performance under ideal conditions is analyzed according to the loop equation.By using state space averaging method to analyze the performance of HGTLDC converters with parasitic parameters,the influence of parasitic parameters on the circuit is analyzed,and the advantages of the proposed new converter are compared and analyzed.Considering the parasitic resistance of the coupling winding,the open-loop transfer functions of HGTLDC for different input and disturbance are derived,and the closed-loop controller from the load end to the input end is constructed to realize the closed-loop control of HGTLDC converter and improve the stability and rapidity of the system.Finally,the Saber simulation software is used to simulate the specific working state of HGTLDC.The inference and conjecture are verified by comparison with theoretical analysis,and a 200 W experimental prototype is built for experimental verification.The experimental results confirm the validity and correctness of theoretical inference,hardware design and software simulation.