Interleaved parallel DC converter

Abstract

The invention discloses an interleaving parallel type direct current converter, and relates to the field of photovoltaic technology, an input part of the interleaving parallel type direct current converter adopts an interleaving parallel structure, so that the interleaving parallel type direct current converter can better adapt to occasions of low-voltage large-current input and high-voltage output, and has excellent natural current sharing capability. The output part adopts an isolated three-level converter circuit structure, and the safety of the converter is further improved by using an isolated structure; a three-level converter structure is utilized, so that the voltage balance between two output capacitors Co1 and Co2 is completely prevented from being influenced by parasitic parameters of an output power supply, a coupling inductor and a diode, the voltages of the two output capacitors of the three-level converter have extremely high self-balance capability, the ripple of the output voltage is reduced, and the output voltage is improved. The DC converter has the characteristics of high voltage gain, low device stress, small switching loss, continuous input current, low current ripple and small number of switching tubes, 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 an interleaved parallel type DC converter. Background technique [0002] New energy represented by solar energy is increasingly popular and widely used due to its regenerative and non-polluting properties. Among them, distributed photovoltaic power generation has the characteristics of low investment, high energy utilization rate, and low environmental pollution, and has a very broad development prospect in the future. Since the output voltage of the currently widely used photovoltaic modules is 18-48V (DC), it cannot meet the higher voltage level of the rear-stage high-voltage grid connection or inverter. For this reason, DC-DC converters are currently used to increase the front-stage voltage. The DC converter is an important component in the photovoltaic system and affects the performance of the entire system. In the field of photovoltaic power generation applications, ...

AI Technical Summary

Problems solved by technology

Since the output voltage of photovoltaic modules widely used at present is 18-48V (DC), it cannot meet the higher voltage level of high-voltage grid connection or inverter of the subsequent stage. After voltage, it is connected to the post-stage load, so the DC converter, as an important component in the photovoltaic system, affects the performance of the entire system

In the field of photovoltaic power generation applications, DC converters are often required to have better performance in terms of gain, loss, ripple, and anti-interference capabilities. Traditional Boost converters have been difficult to meet the needs of photovoltaic power generation applications.

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