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Photovoltaic micro 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 that micro-inverters cannot be used alone, and achieve reduced switching loss, small switching loss, reduced volume and The effect of the output ripple

Active Publication Date: 2015-12-30
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary Boost circuits can only provide a maximum boost ratio of 5 times in practical applications, so they cannot be applied to micro-inverters alone

Method used

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] 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.

[0033]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.

[0034] Such as figure 2 , the pre-stage DC-DC converter includes an input capacitor C 1 , the first Boost circuit, the second Boost circuit...

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Abstract

The invention provides a photovoltaic micro inverter. The inverter comprises a boost module and an inversion module. The boost module comprises a preceding stage DC-DC converter and an after stage DC-DC converter. A photovoltaic array (PV), the preceding stage DC-DC converter, the after stage DC-DC converter and the inversion module are sequentially connected in series. The preceding stage DC-DC converter achieves maximum power point tracking and voltage lifting through a first Boost circuit and a second Boost circuit, the after stage DC-DC converter is responsible for further lifting the voltage so that the power grid grade can be reached, and the maximum power point tracking is achieved while the step-up ratio is larger than 10. According to the photovoltaic micro inverter, the circuit characteristic that switching loss is small is fully utilized, the high-frequency characteristic of a switched-capacitor circuit is played, and the size and output ripples of a filter can be effectively reduced.

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): H02J3/38H02M3/155G05F1/67
CPCY02E10/56
Inventor 周哲赵波任西周刘海军宋洁彭傊田鑫赵鹏程刘宗烨
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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