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Two-pole single-phase photovoltaic inverter and inversion method thereof

A photovoltaic inverter, single-phase technology, applied in photovoltaic power generation, irreversible DC power input conversion to AC power output, instruments, etc., can solve the problem of low inverter efficiency

Inactive Publication Date: 2012-09-12
陕西长岭光伏电气有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the input voltage changes in a large range, the inverter efficiency of using IGBT tubes or MOSFET tubes alone is low

Method used

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  • Two-pole single-phase photovoltaic inverter and inversion method thereof
  • Two-pole single-phase photovoltaic inverter and inversion method thereof
  • Two-pole single-phase photovoltaic inverter and inversion method thereof

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Embodiment Construction

[0031] combine figure 1 , including the front double BOOST (The Boost Converter) boost circuit, the intermediate electrolytic capacitor C1 and the rear inverter circuit, the double BOOST boost circuit includes the first BOOST boost circuit and the second BOOST boost circuit, the first BOOST The output end of the boost circuit is connected in parallel with the intermediate capacitor C1, and the output end of the second BOOST boost circuit is connected in parallel with the intermediate capacitor C1; the switching device Q1 of the first BOOST boosting circuit and the switching device Q8 of the second BOOST boosting circuit are both IGBT tube; the post-stage inverter circuit includes a first circuit connected in parallel with the intermediate stage capacitor C1 and a second circuit connected in parallel with the first circuit, and the first circuit includes the second, fourth, and sixth switching devices connected in series in sequence, that is, Q2 , Q4, Q6; the second circuit inc...

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Abstract

The invention relates to the technical field of inverters, and discloses a two-pole single-phase photovoltaic inverter and an inversion method thereof. The inverter comprises a forestage BOOST voltage booster circuit of which the output end is connected in parallel with an intermediate stage capacitor, wherein a backstage inversion circuit comprises a first circuit and a second circuit which are connected in parallel with the intermediate stage capacitor; the first circuit comprises second, fourth and sixth switches which are connected in series in sequence; the second circuit comprises third, fifth and seventh switches which are connected in series in sequence; a second diode is connected in series between nodes of the second and fourth switches and nodes of the fifth and seventh switches; a third diode is connected in series between nodes of the fourth and sixth switches and nodes of the third and fifth switches; a second inductor is connected in series between nodes of the second and fourth switches and the output end of the backstage inversion circuit; a third inductor is connected in series between nodes of the third and fifth switches and the output end of the backstage inversion circuit; and the output end of the backstage inversion circuit is connected in parallel with a power grid. Due to the adoption of the scheme, leakage current can be reduced effectively, the inversion efficiency is optimized, and adaptation to large-range change of an input voltage is realized.

Description

technical field [0001] The invention relates to the technical field of inverters, and more specifically relates to a bipolar single-phase photovoltaic inverter and an inverter method thereof. Background technique [0002] Single-phase photovoltaic inverters usually use H-bridge inverter circuits, and four switching tubes are used on the bridge arms. The input voltage of unipolar single-phase photovoltaic inverters should not be less than 311V in theory, and the input voltage in practical applications is as high as 400V. When the input voltage varies widely, especially when the input voltage is low, the unipolar single-phase photovoltaic inverter cannot work normally. [0003] The H-bridge inverter circuit adopts bipolar modulation with simple control, and directly connects to the grid to generate power through power frequency transformer isolation or no transformer isolation. Using the technical solution of power frequency transformer isolation, its shortcomings of large vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/537H02M3/155
CPCH02M7/5388H02M1/007H02M1/123Y02E10/56
Inventor 杜建军王超
Owner 陕西长岭光伏电气有限公司
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