Research On A Hybrid Interleaved High Voltage Gain Boost Converter

In recent years,distributed photovoltaic power generation system is favored by people.However,the output voltage level of the single photovoltaic cell is low,and the large output current ripple also has a significant negative impact on the life cycle of the photovoltaic cell.Therefore,it is of great theoretical significance and application value to study a new boost converter with low input current ripple and high voltage ratio.In addition,because the photoelectric conversion efficiency of the solar cell module is restricted by material and technology,the research of high-performance maximum power point tracking(MPPT)control technology which can improve the power utilization of photovoltaic system also has significant practical value.This paper proposes a hybrid interleaved parallel boost converter(HI-Boost)with a wide range of boost regulation,which is suitable for low-voltage distributed generation applications.At the input of HI-Boost,the two primaries winding of coupled inductor is interleaved and paralleled to inherit the shared current and reduce the current ripple.At the same time,the lossless passive clamp circuit is used to recover the leakage energy of the coupling inductor and reduce the voltage stress on the semiconductor device to a lower level.In addition,the secondary winding of the coupling inductor is combined with the diode-capacitor to form two voltage doubling units,which is connected with the output capacitance of the voltage doubling module respectively.The two voltage multiplier modules supply power to the output terminal in series with the output capacitor.The structure greatly improves the voltage gain and reduces the output voltage ripple without using the extreme duty cycle.In addition,the main switch of the converter can work in the range of zero current switching(ZCS)and full duty cycle theoretically,realizing a wide range of boost regulation and high efficiency.Then,the fuzzy control idea is introduced into the traditional conductance increment method,and the Fuzzy-INC MPPT control algorithm is studied.The MPPT performance of photovoltaic power generation system is studied by combining the algorithm with the proposed HI-Boost.In this paper,the working characteristics of the proposed HI-Boost are analyzed in detail,and verified by simulation experiments.In addition,by building a small signal model and designing the closed-loop controller of the converter,an experimental platform based on TMS320F2812 core controller is built.