Multi-port DC-DC converter and method applied to photovoltaic system
A DC-DC and photovoltaic system technology, applied in the direction of output power conversion devices, photovoltaic modules, photovoltaic power generation, etc., can solve the problems of large number of components, high cost and low efficiency
Pending Publication Date: 2022-01-11
SHAANXI UNIV OF SCI & TECH
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[0003] Aiming at the disadvantages of large number of components, low efficiency, high cost, and large scale in the prior art, and in order to avoid the problem of using phase shift angle control, the present invention provides a multi-port DC-DC converter applied to photovoltaic systems and method
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[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are explanations rather than limitations of the present invention.
[0044] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0045] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings a...
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The invention provides a multi-port DC-DC converter and method applied to a photovoltaic system, a two-quadrant inverter ensures one-way power flow from a photovoltaic module connected with the two-quadrant inverter to an output port through a high-frequency transformer, and the action eliminates any circulating current existing between different ports. In addition, the power flow from the two-quadrant inverter may be controlled using its respective duty cycle without phase shifting. Thus, no external inductance is required, which makes the proposed multi-port converter superior to an MAB converter. Each port is controlled to generate the maximum power from the photovoltaic module coupled with the port, the maximum power points of the photovoltaic modules connected to the ports of different types, grades and irradiances can be tracked, and the problems that the number of components is large, the efficiency is low, the cost is high and the scale is large, phase shift angle control is needed in the prior art are solved.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a multi-port DC-DC converter and method applied to a photovoltaic system. Background technique [0002] In the prior art, different input sources are usually connected to the load, and this topology requires a complex controller in addition to the non-isolation feature, which may not be suitable for PV systems; meanwhile, the prior art usually The approach adopted also consisted of three-leg converters at each port connected to a center-strip multi-winding transformer, a disadvantage of this approach was the large number of components; moreover, the analysis of this topology was limited to one input port and two outputs port; for existing triple active bridge DC-DC converters using single-core transformers or dual-core transformers, TAB topology is based on traditional half-H-bridge or full-H-bridge converters, by controlling any two H-bridge converters The...
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IPC IPC(8): H02M3/335H02M7/5387H02S40/30
CPCH02M3/33569H02M7/5387H02S40/30Y02E10/56
Inventor 陈景文周婧
Owner SHAANXI UNIV OF SCI & TECH