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Micro-grid energy storage topological inverter and method for operating same

An inverter and energy storage technology, which is applied to micro-grid energy storage topology inverters and work fields, to achieve the effects of easy control, no secondary fluctuations, and stable DC voltage

Inactive Publication Date: 2014-12-17
JIANGSU UONONE NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention further solves the technical problems of battery and supercapacitor energy storage and feedback

Method used

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  • Micro-grid energy storage topological inverter and method for operating same
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  • Micro-grid energy storage topological inverter and method for operating same

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Experimental program
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Effect test

Embodiment 1

[0021] See Figure 1 to Figure 3 , a micro-grid energy storage topology inverter, including: a circuit breaker QF1, a controller, an isolation transformer T suitable for connecting to a three-phase power supply, and the three-phase outputs of the isolation transformer T are respectively connected to the first, second, and third A four-quadrant H-bridge converter, the first, second, and third four-quadrant H-bridge converters are connected in parallel to the first and second bidirectional DC / DC converters, and the first bidirectional DC The / DC converter is connected to the storage battery 1 , and the second bidirectional DC / DC converter is connected to the supercapacitor 2 .

[0022] The isolation transformer T plays an isolation role on the one hand, and on the other hand increases the input voltage to increase the voltage of the rear-end DC bus, and filters the harmonics brought by the mains and its transformer.

Embodiment 2

[0024] In order to meet the charging and discharging characteristics of the storage battery and the supercapacitor, that is, the charging speed of the supercapacitor is faster than that of the battery, on the basis of the above-mentioned microgrid energy storage topology inverter, the microgrid energy storage topology inverter also includes: control The controller controls the first and second bidirectional DC / DC converters to adjust the charging and discharging of the storage battery 1 and the supercapacitor 2 in the energy storage and feedback modes.

[0025] Specifically, in the energy storage mode, the controller controls each four-quadrant H-bridge converter to convert the alternating current of each phase into corresponding direct current and input it to the first and second bidirectional DC / DC converters, and the control According to the power distribution of the battery 1 and the supercapacitor 2, the current given value and voltage given value of the battery and the su...

Embodiment 3

[0031] On the basis of Embodiment 1 and Embodiment 2, the present invention also provides a working method of a microgrid energy storage topology inverter, wherein the microgrid energy storage topology inverter includes: a controller, The isolation transformer of the three-phase power supply, and the three-phase output of the isolation transformer are respectively connected to the first, second, and third four-quadrant H-bridge converters, and the first, second, and third four-quadrant H-bridge converters are connected to each other. The DC side is connected in parallel with first and second bidirectional DC / DC converters, the first bidirectional DC / DC converter is connected to the storage battery 1 , and the second bidirectional DC / DC converter is connected to the supercapacitor 2 .

[0032] The working method of the micro-grid energy storage topology inverter includes:

[0033]In the energy storage mode, the controller controls each four-quadrant H-bridge converter to conver...

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Abstract

The invention relates to a micro-grid energy storage topological inverter and a method for operating the same. The micro-grid energy storage topological inverter comprises a controller and an isolation transformer applicable to being connected with a three-phase power source. Three output phases of the isolation transformer are respectively connected with a first four-quadrant H-bridge converter, a second four-quadrant H-bridge converter and a third four-quadrant H-bridge converter, direct-current sides of the first four-quadrant H-bridge converter, the second four-quadrant H-bridge converter and the third four-quadrant H-bridge converter are connected with one another in parallel and then are connected with a first bidirectional DC / DC transducer and a second bidirectional DC / DC transducer, the first bidirectional DC / DC transducer is connected with a storage battery, and the second bidirectional DC / DC transducer is connected with a super capacitor. The micro-grid energy storage topological inverter and the method have the advantages that the storage battery and the super capacitor can be respectively charged and discharged by the three four-quadrant H-bridge converters and the two bidirectional DC / DC transducers under the control of the controller, so that micro-grid energy storage and feedback effects can be realized, and corresponding charge and discharge forms can be controlled according to charge and discharge characteristics of the storage battery and the super capacitor.

Description

technical field [0001] The invention relates to an inverter, in particular to a microgrid energy storage topology inverter and a working method. Background technique [0002] With the continuous increase of electricity load, the old pattern of centralized and unified power grid makes the power grid more and more fragile. Therefore, it is necessary to increase the distributed energy structure to improve the reliability of the power grid and ensure the daily electricity consumption of the public and industrial and agricultural electricity consumption. In addition; distributed energy can better achieve energy saving and consumption reduction, which is conducive to the utilization and promotion of clean energy and renewable energy. However, when the power system fails, the distributed power generation must be out of operation immediately. This greatly limits the full play of distributed energy efficiency. In order to coordinate the contradiction between the large power grid a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/72H02J3/32
Inventor 周细文吴晓春章辉马华峰
Owner JIANGSU UONONE NEW ENERGY
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