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High-gain three-level current type bidirectional DC/DC converter and control method thereof

A converter control and two-way conversion technology, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and controlling/regulating systems. It can solve problems such as soft switching and switching tube voltage peaks, and achieve good applications. And promotion prospects, large voltage gain, and the effect of improving efficiency

Inactive Publication Date: 2021-06-25
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The input terminal of the current-source converter is connected to the inductor filter to reduce the current ripple, but there are still problems in the current-source converter, which cannot realize soft switching in the full power range, and due to the existence of transformer leakage inductance, it will generate voltage spike

Method used

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  • High-gain three-level current type bidirectional DC/DC converter and control method thereof
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  • High-gain three-level current type bidirectional DC/DC converter and control method thereof

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Embodiment Construction

[0055] The technical solutions of the present invention will be clearly and completely described below through specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but 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 creative efforts fall within the protection scope of the present invention.

[0056] The present invention will be further described in conjunction with accompanying drawing:

[0057] like figure 1 Shown: the converter includes a first power switch tube S 1 , the second power switch S 2 , the third power switch S 3 , the fourth power switch S 4 , the fifth power switch S 5 , the sixth power switch S 6 , the seventh power switch S 7 , the eighth power switch S 8 , boost inductance L, transfer inductance L s , the clamp capacitor C s , the flying capacitor C f , voltage doubling capacitor C 1...

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Abstract

The invention relates to the technical field of power electronics and particularly relates to a high-gain three-level current-mode bidirectional DC / DC converter and a control method thereof. The high-gain three-level current-mode bidirectional DC / DC converter is formed by connecting a front-stage circuit and a rear-stage circuit through a transformer with a center tap, a low-voltage port restrains voltage spikes of a switching tube through active clamping of a clamping capacitor Cs, energy is stored through a boost inductor L, the low-voltage port and the boost inductor transmit energy to the high-voltage side together through the transformer and the transmission inductor Ls to realize high gain, the high-voltage side adopts a three-level half-bridge structure and adopts a diode and a flying capacitor for clamping, and the stress of a switching tube is reduced to be half of the output voltage; According to the converter, high gain, bidirectional energy flow and low voltage stress of a high-voltage side switch tube are realized, and the high-gain bidirectional energy flow converter is suitable for a renewable energy storage system connected with a storage battery and a super capacitor, and has good application and popularization prospects.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a high-gain three-level current-type bidirectional DC / DC converter and a control method thereof. Background technique [0002] With the development of microgrid and distributed power generation, the energy flow in the system has changed from a single direction flow to a multi-directional flow. Power routers that can realize multi-directional energy flow and can actively control the flow of power flow should be born as needed. Based on power electronic conversion technology, the power router can provide different interfaces for different types of power generation devices and loads. As the core and key link of the power router, the energy storage device needs to suppress intermittent energy fluctuations and meet the power demand of the power router with maximum efficiency. The energy storage device is connected to the DC bus through a bidirectional DC / DC converter to re...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/3353
Inventor 张纯江乔玉玺谢季芳李旭明郭忠南赵晓君
Owner YANSHAN UNIV
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