High-gain Boost converter for photovoltaic power generation

Abstract

The invention discloses a high-gain Boost converter for photovoltaic power generation, and relates to the field of photovoltaic technology, an input circuit of the high-gain Boost converter for photovoltaic power generation forms an interleaving parallel structure, so that the high-gain Boost converter for photovoltaic power generation can better adapt to occasions of low-voltage large-current input and high-voltage output, has excellent natural current sharing capability, and can be applied to the field of photovoltaic power generation. A first clamping circuit and a second clamping circuit are arranged in the input circuit to provide a loop for releasing leakage inductance energy of the coupling inductor, so that the voltage spike of a switching tube is reduced, the reverse recovery current of a semiconductor device can be inhibited, the efficiency of the converter is improved, and the reliability of the converter is improved. Therefore, the Boost converter has the characteristics of high voltage gain, low device stress, small switching loss, continuous input current and low current ripple, is excellent in performance, and can adapt to application requirements in the photovoltaic field.

Description

technical field [0001] The invention relates to the field of photovoltaic technology, in particular to a high-gain boost converter for photovoltaic power generation. Background technique [0002] In recent years, the fossil energy crisis and the increasing global environmental pollution have made photovoltaic power generation one of the research hotspots. More and more photovoltaic distributed generation is connected to the low-voltage distribution network through inverters. However, the output DC voltage of the photovoltaic array is lower than The input DC voltage of the grid-connected inverter, so high-efficiency and high-gain DC / DC converters are indispensable in photovoltaic power generation systems. [0003] The Boost converter is a commonly used DC / DC converter, but the traditional Boost converter has the following problems: the voltage gain is limited by parasitic parameters such as capacitance, inductance, and switching devices, and with the increase of the duty cycl...

AI Technical Summary

Problems solved by technology

[0002] In recent years, the fossil energy crisis and the intensification of global environmental pollution have made photovoltaic power generation one of the research hotspots. More and more distributed photovoltaic power generation is connected to the low-voltage distribution network through inverters. However, the output DC voltage of photovoltaic arrays is lower than The input DC voltage of the grid-connected inverter, so high-efficiency and high-gain DC / DC converters are indispensable in photovoltaic power generation systems

[0003] Boost converter is a commonly used DC / DC converter, but the traditional Boost converter has the following problems: the voltage gain is limited by parasitic parameters such as capacitance, inductance, and switching devices, and as the duty cycle increases, the device current And the input current ripple stress increases accordingly, the diode reverse recovery loss becomes more prominent, resulting in lower converter efficiency

Images