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SCDAB-CLLLC composite direct-current transformer with wide voltage regulation range and control method thereof

A DC transformer and composite technology, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and controlling/regulating systems, etc. Difficulty in type selection, difficult design of soft switching characteristics, etc., to achieve the effect of reducing voltage and current stress, improving overall controllability, and reducing voltage and current stress

Pending Publication Date: 2021-12-14
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER +2
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AI Technical Summary

Problems solved by technology

[0006] In view of the high voltage gain and ZVS in the current DC transformer topology that needs to meet the requirements of high power and high voltage gain at the same time, ZCS soft switching characteristics take into account the difficulty of design, the DC capacitance value of the low voltage side and the resonance current, and the high voltage. Due to the difficulty of current high-frequency resonant capacitor selection and other factors, the present invention provides a SCDAB-CLLLC composite DC transformer with a wide voltage regulation range and its control method. This topology has a wider voltage regulation range and a higher Strong soft switching capability can effectively reduce the voltage and current stress of a single module and improve the overall controllability of the system, which is of great significance for improving the output power quality of DC transformers

Method used

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  • SCDAB-CLLLC composite direct-current transformer with wide voltage regulation range and control method thereof
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  • SCDAB-CLLLC composite direct-current transformer with wide voltage regulation range and control method thereof

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Embodiment Construction

[0042] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0043] The invention provides a SCDAB-CLLLC composite DC transformer with a wide voltage regulation range, such as figure 1 As shown, it includes a connected main circuit and a controller; the input side of the main circuit is connected to a medium-voltage DC bus or a low-voltage DC bus, and the output side is connected to a low-voltage DC load; the controller receives the input voltage and output voltage of the main circuit And the output current, and the output is connected to the corresponding switch tube in the main circuit;

[0044] The main circuit includes a switched capacitor bidirectional full-bridge DC / DC transformer and a CLLLC resonant transformer connected in cascade, and the cascading mode is input in series and output in parallel. This cascading method can reduce the voltage a...

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Abstract

The invention provides an SCDAB-CLLLC composite direct-current transformer with a wide voltage regulation range and a control method thereof. A main circuit comprises a switched capacitor type bidirectional full-bridge DC / DC converter and a CLLLC type resonant converter which are cascaded in an input-series output-parallel manner, so the requirement on the transformation ratio of a high-frequency transformer is reduced, the voltage and current stress of an input side power device is reduced, and the voltage regulation range is wide. The controller takes a DSP as a core device and has the functions of overvoltage and overcurrent protection, phase shift control and frequency modulation control; the phase shift control is applied to the switched capacitor type bidirectional full-bridge DC / DC converter, and the frequency modulation control is applied to the CLLLC type resonant converter.

Description

technical field [0001] The invention relates to the field of power conversion of medium and low-voltage DC distribution networks in power electronics, in particular to a SCDAB-CLLLC composite DC transformer with a wide voltage regulation range and a control method thereof. Background technique [0002] In response to the huge challenges brought about by global climate change and the dwindling fossil energy reserves, the development of new energy power generation has become the main trend of world energy development. The proportion of new energy power generation in the total power generation and the number of new energy installed capacity are continuously increasing. . Compared with traditional thermal power generation and nuclear power generation, new energy power generation fluctuates greatly randomly, and the power generation is easily affected by environmental factors such as temperature and light. When a large amount of new energy power generation is connected to the AC...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/08
CPCH02M3/33584H02M1/083Y02B70/10
Inventor 王金浩任远李胜文常潇李瑞雷达宋述勇任勇边江王翌琛刘志良韩润东杨超颖刘翼肇李慧蓬高乐王丰卓放
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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