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Photovoltaic inverter having a plurality of MPPT units

A photovoltaic inverter, photovoltaic technology, applied in photovoltaic power generation, photovoltaic modules, irreversible DC power input conversion to AC power output and other directions, can solve problems such as low reliability, inability to achieve carrier synchronization, and reduce LCL resonance. risk, the effect of reducing the risk of high frequency circulation

Active Publication Date: 2015-09-02
SUNGROW POWER SUPPLY CO LTD
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  • Claims
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Problems solved by technology

In this regard, the existing scheme randomly selects an inverter unit from the photovoltaic inverter as the master, and sends a carrier synchronization signal to the slaves of other inverter units through a public communication bus to control each slave to maintain carrier synchronization with the master. However, the disadvantage of this solution is that once the public communication bus is short-circuited, each slave and the master cannot achieve carrier synchronization, and the reliability is low

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  • Photovoltaic inverter having a plurality of MPPT units
  • Photovoltaic inverter having a plurality of MPPT units

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[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] In order to reduce the risk of high-frequency circulating current in the same MPPT unit and reduce the risk of LCL resonance when multiple inverter units operate in parallel on the AC side, the embodiment of the present invention discloses a photovoltaic inverter with multiple MPPT units. The photovoltaic inverter can be a photovoltaic inverter with both MPPT units with the number of inverter units greater than 1 and an MPPT unit with the number of inver...

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Abstract

The application discloses a photovoltaic inverter having a plurality of maximum power point tracking (MPPT) units. One inversion unit is set as a carrier synchronization host and other inversion units are set as carrier synchronization slaves in advance in each MPPT unit. The MPPT unit with the number of the inversion units being equal to 1 has one carrier synchronization host and zero carrier synchronization slave. The carrier synchronization host in one MPPT unit is connected to all carrier synchronization slaves in the same MPPT unit and carrier synchronization hosts of the rest of MPPT units by a communication bus. And the carrier synchronization host of each MPPT unit, with the number of the inversion units being larger than 1, of the rest of MPPT units is connected with all carrier synchronization slaves of the same MPPT unit by a communication bus. Therefore, a high-frequency ring current in the same MPPT unit can be reduced; and an LCL resonance risk occurring in parallel operation of alternating-current sides of a multi-inversion unit is reduced.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, and more specifically, to a photovoltaic inverter with a plurality of MPPT units. Background technique [0002] see figure 1 , for a photovoltaic inverter with multiple MPPT (Maximum Power Point Tracking, maximum power point tracking) units, each MPPT unit contains at least one inverter unit, wherein: each inverter unit in the photovoltaic inverter The AC sides of the MPPT units are directly connected in parallel, and each inverter unit in the same MPPT unit shares a DC bus. [0003] The carriers of each inverter unit in the same MPPT unit are not synchronized, which will form a high-frequency circulating current, threatening the stable operation of the system; and the carriers of each inverter unit in the entire photovoltaic inverter are not synchronized, which will increase the risk of LCL resonance during parallel operation on the AC side . In this regard, the existing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/42H02S40/32
CPCY02E10/56
Inventor 邹海晏陶磊丁杰徐涛涛张成刘琦
Owner SUNGROW POWER SUPPLY CO LTD
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