Power generation energy storage device based on cascade H bridge and multiport DC converter

A technology for DC converters and energy storage devices, which is applied to output power conversion devices, conversion of AC power input to DC power output, electrical components, etc. , large voltage changes, etc., to facilitate power distribution, reduce losses, and reduce electromagnetic interference.

Inactive Publication Date: 2014-01-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The power converter is an important part of the photovoltaic power generation system, but the fast switching action of the power switching device will produce a large voltage change, which is prone to electromagnetic interference problems
Traditional photovoltaic and battery DC / DC converters are independent, requiring a large number of DC / DC converters and complex structures
In addition, the traditional photovoltaic and battery grid-connected inverters use independent grid-connected inverters, and the grid-connected harmonics are relatively large

Method used

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  • Power generation energy storage device based on cascade H bridge and multiport DC converter
  • Power generation energy storage device based on cascade H bridge and multiport DC converter
  • Power generation energy storage device based on cascade H bridge and multiport DC converter

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Embodiment Construction

[0023] In order to make the technical means, creative features, goals and effects of the present invention easy to understand, the following uses a photovoltaic / storage battery hybrid system as a specific example to further illustrate the principles of the present invention.

[0024] as attached figure 1 and 2 As shown in , the power generation energy storage device based on the cascaded H-bridge and the multi-port DC converter includes multiple power generation subsystem units 1 cascaded on the AC side, and the power generation subsystem unit 1 connected to the external power grid 3 Filter inductor 2; each power generation subsystem unit 1 includes a first full-bridge converter 6, a second full-bridge converter 7, a power generation module 4 connected to the DC end of the first full-bridge converter 6, and a second full-bridge converter The energy storage module 5 connected to the DC terminal of the transformer 7, the multi-winding transformer 8 connected to the AC terminal ...

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Abstract

The invention discloses a power generation energy storage device based on cascade H bridge and multiport DC converter. The power generation energy storage device comprises a first full-bridge converter connected with a power generation module, a second full-bridge converter connected with an energy storage module, a third full-bridge converter connected with a multi-winding transformer, and a H bridge converter connected with an electric grid through a filter inductor. By a power generation / energy storage hybrid device, irregular new energy generated power becomes relatively smooth, and an electric grid current is limited when electric grid voltage drops. A multiport full-bridge isolated DC / DC converter can realize flexible match between the power generation module and the energy storage module with different output voltage grades, meanwhile, soft switching is realized by transformer leakage inductance and switching element stray capacitance, relatively high efficiency and electric isolation are realized, and cost is lowered. The cascade H bridge inverter is used on the electric grid side, thus, multi-level output voltage is obtained, and electromagnetic compatibility and grid connection harmonic performance are improved.

Description

technical field [0001] The invention belongs to the field of electric engineering, power electronics and new energy power generation, and relates to a power generation energy storage device based on a cascaded H-bridge and a multi-port full-bridge isolated DC / DC converter, which is suitable for distributed power generation systems and new energy vehicle energy storage devices. management system. Background technique [0002] Energy and environmental issues have become increasingly prominent, and new energy power generation technologies have developed rapidly. However, compared with traditional power generation methods, new energy power generation has volatility. In order to improve power quality, energy storage devices need to be added. The photovoltaic power generation is taken as an example below for a specific description. Photovoltaic power generation has the advantages of energy saving and less mechanical parts, and is a promising new energy power generation technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M7/5387
CPCY02B70/1491Y02B70/10
Inventor 王政储凯程明
Owner SOUTHEAST UNIV
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