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Grid-connected inverter and its output filtering method

An inverter and AC output technology, which is applied in the field of grid-connected inverters and their output filtering, can solve the problems of large number of switches and complicated switching process, and achieve the effect of reducing the number of uses, simple switching process, and good output filtering

Active Publication Date: 2016-04-13
SICHUAN INJET ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of large number of switches and complex switching process in the prior art, to provide a grid-connected inverter with a small number of switches, and to provide an output filtering method of the grid-connected inverter

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  • Grid-connected inverter and its output filtering method
  • Grid-connected inverter and its output filtering method
  • Grid-connected inverter and its output filtering method

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with test examples and specific embodiments. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0023] refer to figure 1 , the grid-connected inverter listed in this embodiment includes a battery board 1, and the battery board is connected to a DC filter 2, and the DC filter 2 in this embodiment is a filter capacitor. The DC filter 2 is connected to the input end of the three-phase inverter bridge 3, the output end of the three-phase inverter bridge 3 is connected to the input end of the AC output filter unit 6, and the output end of the AC output filter unit 6 is connected to the grid. The input end of the AC output filter unit 6 is also connected to the data collector 4 , an...

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Abstract

The invention discloses a grid connected inverter, which comprises an alternating current output filtering unit, a data acquisition unit and a controller, wherein the data acquisition unit is used for acquiring the output current of a three-phase inverter bridge and outputting the acquired current data to the controller; the alternating current output filtering unit comprises at least one LC filter or LCL filter; the inductive branch of each LC filter or each LCL filter is connected in series with at least one second inductor; the capacitive branch of the LC filter is connected in parallel with at least one second capacitor. In the grid connected inverter disclosed by the invention, combined filtering is realized only by adopting two switching devices, thereby reducing the using number of the switching devices and reducing the cost. By adopting the output filtering method provided by the invention, output harmonic in case of low output current is reduced, and the conversion efficiency in case of low output current is increased.

Description

technical field [0001] The invention relates to the technical field of grid-connected inverters, in particular to a grid-connected inverter and an output filtering method thereof. Background technique [0002] With the wide application of grid-connected technology. The output power quality of grid-connected inverters has received more attention. In order to reduce the grid-connected output harmonics and improve the output power quality, it is necessary to filter the AC output of the grid-connected inverter. In order to realize the output filtering of the grid-connected inverter, the traditional method is to change the switching frequency of the power device, and increase the switching frequency of the power module when the output is small. The implementation of the traditional method is relatively complicated, and changing the switching frequency will also have a great impact on the power device. The Chinese patent "A Grid-connected Inverter and Its AC Output Filtering Me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/42H02M1/12H02J3/38
Inventor 康智斌陈晓法陈超
Owner SICHUAN INJET ELECTRIC CO LTD