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Photovoltaic grid-connected inverter with common-mode current suppression and suppression method thereof

A common-mode current and inverter technology, applied in the field of photovoltaic grid-connected inverters and their suppression, can solve problems such as difficulty in controlling common-mode currents

Active Publication Date: 2016-09-07
JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The emergence of a series of control algorithms strives to limit the lowest value of common-mode voltage, even so, it is difficult to control the common-mode current below the standard

Method used

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  • Photovoltaic grid-connected inverter with common-mode current suppression and suppression method thereof
  • Photovoltaic grid-connected inverter with common-mode current suppression and suppression method thereof
  • Photovoltaic grid-connected inverter with common-mode current suppression and suppression method thereof

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Embodiment Construction

[0020] The following will be combined Attached picture On the basis of the detailed description of the photovoltaic grid-connected inverter with common mode current suppression function and its suppression method of the present invention:

[0021] The photovoltaic grid-connected inverter with common-mode current suppression function includes: a solar plate PV, an output terminal of the solar plate PV is sequentially connected to one end of the capacitor C2 and the first end of the differential common-mode inductor L1, and the solar plate PV The other output end of the capacitor C1 is sequentially connected to one end of the capacitor C3 and the second end of the differential common mode inductor L1, wherein the first end of the differential common mode inductor and the second end of the differential common mode inductor are end of the same name. The midpoint of capacitor C2 and capacitor C3 is connected to capacitor C4. The third end of the differential common mode inductor ...

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Abstract

The invention discloses a common-mode current suppression inverter, comprising a solar polar panel PV, wherein one output end of the solar polar panel PV is sequentially connected with one end of a capacitor C2 and the first end of a differential-mode and common-mode inductor L1, the other output end of the solar polar panel PV is sequentially connected with one end of a capacitor C1, one end of the capacitor C3 and the second end of the differential-mode and common-mode inductor L1, and the first end of the differential-mode and common-mode inductor and the second end of the differential-mode and common-mode inductor are dotted terminals. C1 is the solar polar panel; C4 is connected with the midpoint of the grounding parasitic capacitors C2 and C3; L1 is the integrated differential-mode and common-mode inductor; L2, IG1 and D1 constitute a boosted circuit; CD is the bus filter capacitor, C7 is connected with the midpoint of C5 and C6; IG2 to IG5 constitute a full bridge inverter circuit; L3, C8 and C9 constitute a differential-mode filter circuit;L3 is the integrated differential-mode and common-mode inductor, and L5 is the common-mode inductor.

Description

technical field [0001] The invention relates to a photovoltaic grid-connected inverter with common-mode current suppression and a suppression method thereof, belonging to the field of photovoltaic power generation energy. Background technique [0002] The non-isolated photovoltaic grid-connected inverter structure does not contain a transformer, and has the absolute advantages of high conversion efficiency, small size, light weight, and low cost. However, the lack of a transformer makes the solar plate and the grid electrically connected, and the common mode current A substantial increase may cause security problems. Therefore, how to reduce the common-mode current has become one of the research hotspots of photovoltaic grid-connected inverters. [0003] The emergence of a series of control algorithms strives to limit the lowest value of common-mode voltage, even so, it is difficult to control the common-mode current below the standard. Contents of the invention [0004]...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H01F3/14H02M1/12
CPCH01F3/14H02M1/12H02M7/5387H02M1/123Y02E10/56
Inventor 黄敏张晓宏李松涛任芝方刚卢进军仝冠生
Owner JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO LTD
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