Variable-structure dual-input direct-current converter

Abstract

The invention provides a variable-structure dual-input direct-current converter. The converter comprises an inductor, a high-frequency power switch, a high-frequency diode, a boost capacitor, an output filter capacitor and a low-frequency switching circuit, wherein the low-frequency switching circuit is composed of a first low-frequency change-over switch, a second low-frequency change-over switch and a low-frequency bypass diode. The variable-structure dual-input converter can work in a duel-input manner and in a single-input and high-gain manner, thus realizing different functions with the same circuit structure, not only reducing the cost, but also achieving relatively good flexibility, and being beneficial to the improvement of the overall working performance of the converter. In particular, as being additionally provided with the low-frequency switching circuit based on a multi-input converter, the direct-current converter can change the structure through controlling the low-frequency change-over switch according to input condition changes, so that the direct-current converter can realize both multi-input combined power supply and single-input high-gain work, and can implement combined power supply and high-gain voltage regulation at low voltage input simultaneously.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to a variable-structure double-input DC converter. [0002] Background technique [0003] The wind-solar hybrid grid-connected power generation system makes full use of the respective characteristics of wind energy and solar energy, and cooperates with each other to maximize the effectiveness of renewable energy, which has great application value and prospects. The wind-solar hybrid grid-connected power generation system can operate in the following three modes according to the change of wind and solar radiation: wind turbine power supply alone; photovoltaic power generation system alone power supply; wind turbine and photovoltaic power generation system joint power supply. In the traditional wind-solar hybrid grid-connected power generation system, in order to improve the utilization efficiency of renewable energy, wind energy and solar energy each need a DC converter to convert the input sour...

AI Technical Summary

Problems solved by technology

[0007] To sum up, in the wind-solar hybrid grid-connected power generation system, the existing multi-input DC converter can only guarantee the high performance of the system when wind energy and solar energy are jointly powered, and cannot meet the requirements of high gain and high efficiency when solar energy works alone; However, the existing single-input high-gain converter can only work with a single input, and cannot adjust the complementary work of wind energy and solar energy.

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