A three-port converter with soft switching capability and its control method

A three-port, converter technology, applied in the control/regulation system, output power conversion device, DC power input conversion to DC power output, etc., can solve the problem of high voltage stress of power tubes, large volume and weight, and large number of components and other problems, to achieve the effect of low voltage stress and strong boosting ability

Active Publication Date: 2022-05-17
NANTONG UNIVERSITY
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  • Application Information

AI Technical Summary

Problems solved by technology

The three-port converters with high gain capability in the prior art generally have disadvantages such as a large number of components, high voltage stress of power tubes, large volume and weight, etc.
If the power density is increased by increasing the switching frequency based on the existing technology, the switching loss will be the bottleneck

Method used

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  • A three-port converter with soft switching capability and its control method
  • A three-port converter with soft switching capability and its control method
  • A three-port converter with soft switching capability and its control method

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Embodiment Construction

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] like figure 1 As shown, in the embodiment of the present application, a three-port converter with relatively high boosting capability, the three ports of the converter are respectively connected to the photovoltaic cell, the storage battery and the load, and the feature is that the converter includes: a first switch Tube S 1 , the second switch tube S 2 , the first capacitance C 1 , the second capacitance C 2 , the third capacitor C ...

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Abstract

The invention belongs to the technical field of converter control, and discloses a three-port converter with soft switching capability. The converter includes two switch tubes, three capacitors, two diodes and two inductors. It can realize the flexible control of the power flow between the three ports, and can realize the zero-voltage turn-on of all switch tubes and the natural turn-off of all diodes. All power tubes are under low voltage stress, which effectively improves the off-grid photovoltaic system. Integration and conversion efficiency of power generation system. The invention also discloses the control method of the converter. The first inductance is designed to work in the current discontinuous mode, and the frequency conversion control is adopted to realize load constant voltage control; the second inductance is designed to work in the current bidirectional continuous conduction mode, and the variable duty ratio is adopted. Realize maximum power point tracking control of photovoltaic modules.

Description

technical field [0001] The invention belongs to the technical field of converter control, and in particular relates to a three-port converter with soft switching capability and a control method thereof. Background technique [0002] With the increasing energy crisis and environmental pollution, photovoltaic power generation technology has attracted extensive attention from governments and enterprises in various countries. Due to the volatility and randomness of solar energy, off-grid photovoltaic power generation systems need to be equipped with batteries to store and adjust electric energy to ensure continuous and stable power supply to loads (such as DC converters, inverters, DC micro-grids, etc.), and to realize photovoltaic cells The maximum power point tracking (Maximum Power Point Tracking, MPPT) control and battery charge and discharge control. Since the off-grid photovoltaic power generation system has three ports: photovoltaic, storage battery and load. Therefore,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158H02M1/088H02J7/35G05F1/67
CPCH02M3/158H02M1/088H02J7/35G05F1/67H02J2207/20Y02E10/56
Inventor 秦岭田民张雷王亚芳钱天泓饶家齐许兴周磊段冰莹刘宇涵
Owner NANTONG UNIVERSITY
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