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Topology-variable micro-inverter and its digital control device

A micro-inverter, variable technology, applied in output power conversion devices, control/regulation systems, instruments, etc., can solve problems such as low efficiency, restricting the weighted efficiency value, difficult to meet, etc. The effect of recovery loss and high-efficiency transmission

Active Publication Date: 2018-08-10
江苏光讯电力新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the AC / AC converter is a cycloconverter, which is used to convert high-frequency AC into power frequency AC; and the micro-inverter with DC link is divided into two types: smooth DC link and pseudo-DC link. Link micro-inverter, no DC link micro-inverter has a small number of power conversion stages and high conversion efficiency, and has been widely valued. The micro-inverter without DC link, and the low efficiency of the flyback micro-inverter at high power further restricts its widespread use; the micro-inverter based on the bridge circuit has a low power The time efficiency is low, which restricts its weighted efficiency value and makes it difficult to meet the requirements of relevant regulations

Method used

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  • Topology-variable micro-inverter and its digital control device
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  • Topology-variable micro-inverter and its digital control device

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Embodiment Construction

[0024]Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0025] Such as figure 1 As shown, a topology-variable micro-inverter includes an input filter capacitor C in , full-bridge circuit, snubber inductor L, high-frequency transformer T, cycle rectification circuit and grid-connected filter circuit, the following will describe their interconnection and components in detail.

[0026] The full bridge circuit uses photovoltaic cells as the input power supply, and includes the first switching tube S1, the second switching tube S2, the third switching tube ...

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Abstract

The invention discloses a topology-variable micro-inverter and its digital control device, including two links of DC / AC and AC / AC. The transformer works in the bridge mode, and the transformer core is magnetized in both forward and reverse directions; when the power is low, it works in the improved double-tube forward mode, and the transformer core is magnetized in one direction. The design parameters of the transformer under the two kinds of work are the same, and the high-power and low-power can be efficiently converted through the change of the control strategy, which meets the requirements of the relevant institutions for CEC efficiency and European efficiency.

Description

technical field [0001] The invention relates to a topology-variable micro-inverter and a digital control device thereof, and belongs to the technical field of power electronic converters and control thereof. Background technique [0002] Photovoltaic power modules can be divided into two types: DC modules and AC modules (ie micro-inverters). Although the DC / DC converter in the photovoltaic DC module realizes the MPPT of each panel, the centralized DC / AC also ensures the high efficiency of the system, but this also leads to low system redundancy. Photovoltaic micro-inverters can be directly integrated with the interface device of the grid on the back of the battery panel. It is easy to install, hot-swappable, and has good redundancy performance, so it has been extensively studied. [0003] Commonly used isolated micro-inverters can be divided into micro-inverters without a DC link and micro-inverters with a DC link. The micro-inverter without a DC link includes a DC / AC conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M3/335
CPCH02M3/33569H02M7/5387H02M1/0048H02M1/0054Y02B70/10
Inventor 吴云亚阚加荣许志华尚志根冯赛非薛迎成姚志垒
Owner 江苏光讯电力新能源有限公司
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