Wide-range input non-isolated three-port DC-DC converter

Abstract

The invention relates to a wide-range input non-isolated three-port DC-DC converter which is characterized in that the wide-range input non-isolated three-port DC-DC converter is composed of a four-switch Buck-Boost converter, a photovoltaic cell, a storage battery, three ports of a DC bus and a Boost converter, a four-switch Buck-Boost circuit is used for connecting the photovoltaic cell, the storage battery and a load, and a Boost circuit is used for connecting the photovoltaic cell and the load; a positive electrode of a photovoltaic cell in the four-switch Buck-Boost circuit is connected to a positive electrode of a diode VD1, the diode VD1 is connected with a diode VD2, the diode VD2 is connected with a switch tube S1, and three branches are led out from a source electrode of the switch tube S1. A port of the photovoltaic cell and a port of a storage battery are connected through the four-switch Buck-Boost circuit. The method can be applied to a scene in which the photovoltaic cell voltage is greater than the storage battery voltage, and also can be applied to a scene in which the photovoltaic cell voltage is less than the storage battery voltage.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a wide-range input non-isolated three-port DC-DC converter. Background technique [0002] With the depletion of fossil energy, renewable energy is getting more and more attention. However, renewable energy has the characteristics of randomness, intermittentness, and slow dynamic response. In order to achieve stable energy supply and quickly respond to load energy demand, it is often necessary to increase energy storage equipment. The traditional energy management solution for renewable energy ports, energy storage ports and load ports uses multiple power electronic conversion devices, but this method has low component utilization, high volume cost, and complex control. [0003] A three-port converter is an integrated converter that can connect three ports simultaneously. It has the advantages of compact structure, small volume and cost, and convenient centra...

AI Technical Summary

Problems solved by technology

A variety of three-port converter topologies have been proposed in many literatures, but these topologies usually have obvious size constraints on the voltage between the ports, and are difficult to apply in a narrow range.

For example, [1]Tomas-Manez,K.,et al."High Efficiency Non-isolated Three Port DC-DC Converter for PV-Battery Systems."ECCE-Aisa 2016IEEE,2016. The non-isolated three-port converter introduced only Can be applied to scenarios where the voltage of the photovoltaic cell is greater than the voltage of the battery, [2] Zhang, B., et al."Novel topology and control of a non-isolated three port DC-DC converter for PV-battery power system."201720thInternational Conference on Electrical Machines and Systems (ICEMS) IEEE, 2017. The non-isolated three-port converter introduced can only be applied to scenarios where the photovoltaic cell voltage is lower than the battery voltage

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