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Photovoltaic micro inverter

A micro-inverter and photovoltaic technology, which is applied in photovoltaic power generation, instruments, and electric variable adjustment, can solve the problems of narrow modulation range and inability to realize maximum power point tracking, etc., and achieve reduction in volume, output ripple, and switching loss The effect of reducing and switching loss is small

Inactive Publication Date: 2016-10-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] 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.

[0030] 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.

[0031] Such as figure 2 , the pre-stage DC-DC converter includes an input capacitor C 1 , Buck-Boost circuit and output capacitor C 2 ; ...

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Abstract

The invention provides a photovoltaic micro inverter. The inverter comprises a boost module and an inverter module. The boost module comprises a preceding-stage DC-DC converter and a backward-stage DC-DC converter. A photovoltaic array (PV), the preceding-stage DC-DC converter, the backward-stage DC-DC converter and the inverter module are sequentially connected in series. The preceding-stage DC-DC converter comprises an input capacitor C1, a Buck-Boost circuit and an output capacitor C2. The input capacitor C1 is connected in parallel with the Buck-Boost circuit. The Buck-Boost circuit is connected in parallel with the output capacitor C2. According to the technical scheme of the invention, the circuit characteristics of small switching loss is fully utilized, and the high frequency characteristics of a switched-capacitor circuit is given play to. Therefore, the volume and the output ripple wave of a filter are 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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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M3/158H02M1/14
CPCH02M1/14H02M3/1582H02M7/4826H02M1/0058H02M1/007Y02B70/10Y02E10/56
Inventor 周哲王光波邓占锋
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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