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Photovoltaic mini inverter

A micro-inverter and photovoltaic technology, which is applied in photovoltaic power generation, instruments, and regulation of electrical variables, etc., can solve the problems of inability to achieve maximum power point tracking, narrow modulation range, etc., and achieve the effect of reducing volume and switching loss

Inactive Publication Date: 2016-11-09
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • 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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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 Controlling, inverting direct current into alternating current and incorporating 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] Such as figure 2 , the pre-stage DC-DC converter includes an input capacitor C 1 , Sepic circuit and output capacitor C 2 ;

[00...

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PUM

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Abstract

The invention provides a photovoltaic mini inverter. The inverter comprises a boost module and an inversion module; the boost module comprises a preceding DC-DC converter and a post DC-DC converter; and a photovoltaic array (PV), the preceding DC-DC converter, the post DC-DC converter and an the inversion module are connected in series successively. The preceding DC-DC converter uses a Sepic circuit to track the maximal power point and increase the voltage, the post DC-DC converter further increases the voltage to a power grid level, and the maximal power point is tracked while the boosting ratio is greater than 10. The characteristic of low switching loss of the circuit is utilized fully, high-frequency characteristic of a switched capacitor circuit is used, and the size and output ripple of a 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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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M3/155
CPCH02J3/385H02M3/155Y02E10/56
Inventor 周哲王光波
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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