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High-efficiency dual-input inverter for distributed photovoltaic grid-connected systems

An inverter and dual-efficiency technology, applied in the field of high-energy-efficiency dual-input inverters, can solve problems such as insurmountable two-stage power conversion

Inactive Publication Date: 2020-11-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its essence as a step-down inverter, it still cannot overcome the shortcomings of two-stage power conversion

Method used

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  • High-efficiency dual-input inverter for distributed photovoltaic grid-connected systems
  • High-efficiency dual-input inverter for distributed photovoltaic grid-connected systems
  • High-efficiency dual-input inverter for distributed photovoltaic grid-connected systems

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Embodiment Construction

[0054] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0055] The high-efficiency dual-input inverter consists of a positive half-cycle DC input source (V P ), negative half-cycle DC input source (V N ), inverter bridge arm-P, inverter bridge arm-N, integrated Boost-P, integrated Boost-N, positive filter inductor (L P ), negative filter inductance (L N ), Positive low frequency switching tube (S P ), Negative low frequency switching tube (S N ) and DC bus capacitance (C Bus ) constitutes; of which,

[0056] The inverter bridge arm-P consists of a first positive switching tube (S P1 ), the second positive switching tube (S P2 ), the first positive diode (D P1 ), the second positive diode (D P2 )composition,

[0057] The inverter bridge arm-N is composed of the first negative switching tube (S N1 ), the second negative switch (S N2 ), the first negative diode (D N1 ), the second negative diode (D N2 )composit...

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Abstract

The invention discloses a high-energy-efficiency dual-input inverter suitable for a distributed photovoltaic grid-connected system, belonging to the technical field of power electronic converters. Theconverter consists of two DC input sources (VP - VN), two inverter arms (P - N), two integrated Boost circuits (Boost P - Boost N), two filter inductors (LP - LN), two low frequency switching transistors (SP - SN), a DC bus capacitor (CBus) and a power grid (vG). The control circuit of the inverter includes Boost- P, Boost- N, the inverter controller and PWM modulation unit. The invention can simultaneously realize the maximum power point tracking of two DC input sources VP and VN and the control of the output grid-connected current. The two inverter bridge arms of the present invention bothcontain diodes in reverse series, without the risk of the bridge arm going through. The invention generates a plurality of levels at the midpoint of the bridge arm, facilitating the reduction of switching losses and filter volumes. Only a small part of the energy of the invention needs to be processed by two Boost circuits, and most of the energy can be directly transferred to a power network by an inverter, thus reducing the number of power conversion stages, and the system efficiency is high.

Description

technical field [0001] The invention relates to a high-energy-efficiency dual-input inverter suitable for a distributed photovoltaic grid-connected system, and belongs to the technical field of power electronics, in particular to the technical field of DC-AC power conversion. Background technique [0002] In recent years, photovoltaic power generation systems have been widely used. As an important part of the photovoltaic power generation system, the grid-connected inverter has an important impact on the efficiency, cost and reliability of the system. Non-isolated single-phase photovoltaic grid-connected inverters have been widely used due to their advantages of high conversion efficiency, small volume, small weight and low cost. [0003] Affected by factors such as illumination, the voltage-current characteristics of different photovoltaic arrays are different. Therefore, it is necessary to perform maximum power point tracking on different photovoltaic arrays, that is, di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02J3/38
CPCH02J3/385H02M7/53871Y02E10/56
Inventor 杨帆葛红娟吴红飞杨晶帆于兆龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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