Photovoltaic micro inverter

A technology of micro-inverters and inverters, applied in photovoltaic modules, photovoltaic power generation, instruments, etc., can solve the problems of narrow modulation range and inability to achieve maximum power point tracking, etc., and achieve volume reduction and output ripple, switching Effect of reduced loss and small switching loss

Inactive Publication Date: 2016-10-26
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its modulation range is narrow, and maximum power point tracking cannot be achieved.

Method used

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  • Photovoltaic micro inverter
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Examples

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] The invention provides a photovoltaic micro-inverter, such as figure 1 , the inverter includes a boost module and an inverter module; the boost module realizes the maximum power point tracking of the photovoltaic cell, and at the same time increases the voltage to facilitate direct inverter grid connection; the inverter module realizes phase-locked control and DC side voltage control, Invert direct current into alternating current and feed it into the grid.

[0031] The boost module includes a front-stage DC-DC converter and a rear-stage DC-DC converter; a photovoltaic array, a front-stage DC-DC converter, a rear-stage DC-DC converter, and an inverter module are connected in series in sequence.

[0032] like figure 2 , the pre-stage DC-DC converter includes an input capacitor C 1 , Boost circuit and output capacitor C 2 ;

[0033] Input capacitan...

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Abstract

Provided in the invention is a photovoltaic micro inverter comprising a boost module and an inversion module. The boost module consists of a pre-stage DC-DC converter and post-stage DC-DC converter. A photovoltaic array, the pre-stage DC-DC converter, the post-stage DC-DC converter, and the inversion module are connected in series. The pre-stage DC-DC converter includes an input capacitor C1, a boost circuit, and an output capacitor C2; the input capacitor C1 and the boost circuit are connected in parallel; and the boost circuit and the output capacitor C2 are connected in parallel. According to the invention, with full utilization of the circuit characteristic of low switch losses and the high-frequency characteristic of the switch capacitor circuit, the size and output ripple of the filter can be reduced effectively.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a photovoltaic micro-inverter. Background technique [0002] In recent years, photovoltaic micro-inverters have attracted more and more attention due to their unique advantages. It is an inverter that is connected to a single photovoltaic module and can directly convert the direct current output by photovoltaics into alternating current that meets grid-connected conditions. The power is generally between 50 and 300W. Photovoltaic microinverters can effectively prevent power loss caused by partial shading, reduce installation costs by simplifying wiring, and improve the overall reliability of the system by using independent architectures. [0003] Photovoltaic inverters can be divided into single-stage structure and two-stage structure. A single-stage inverter refers to a photovoltaic power converter that realizes maximum power point tracking control and DC...

Claims

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Application Information

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IPC IPC(8): H02S40/32H02J3/38H02M3/155H02M1/00
CPCH02J3/385H02M1/00H02M3/155H02S40/32H02M1/0054Y02B70/10Y02E10/56
Inventor 王光波周哲邓占锋
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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