Non-isolated high-gain three-port converter

Abstract

The invention relates to a non-isolated high-gain three-port converter. The converter comprises a photovoltaic cell input port, a storage battery port, a load port, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor and a third capacitor. By controlling the four switch tubes, energy management and control among the photovoltaic cell, the storage battery and the load can be realized by adopting one converter. The direct-current converter has four working modes, and the functions of a plurality of single-input single-output converters can be completed in one converter. The converter has the advantages of low cost, high gain, high conversion efficiency, flexible working mode, high reliability and the like.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a non-isolated high-gain three-port converter. Background technique [0002] With the increase of human demand for energy and the gradual depletion of global primary energy, solar photovoltaic power generation and fuel cell power generation systems have received more and more attention. Since solar cells and other new energy power generation systems have shortcomings such as unstable power supply, discontinuity, and changes with environmental conditions, energy storage devices are required to provide peak power and recover excess energy to ensure continuity and reliability of power supply. [0003] In the traditional new energy combined power generation system, the access of each new energy needs to correspond to a DC-DC converter, which converts each energy into a DC voltage output and connects it in parallel to the common DC bus, which has two defects. : ...

AI Technical Summary

Problems solved by technology

[0003] In the traditional new energy combined power generation system, the access of each new energy needs to correspond to a DC-DC converter, which converts each energy into a DC voltage output and connects it in parallel to the common DC bus, which has two defects. : On the one hand, the structure is complex and the cost is high; on the other hand, the voltage stress of the switching tube and diode in the converter is high

[0004] Since the DC output voltage level of a single fuel cell or photovoltaic cell is low, it cannot meet the voltage level requirements of the DC side of the grid-connected inverter. Therefore, it is necessary to add a high-gain DC converter at the front end of the DC bus side of the power generation system to increase the voltage level. , supplied to the grid-connected inverter of the subsequent stage

Images