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Gating unit and efficient non-isolated three-level grid-connected inverter

A gating unit and gating circuit technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve problems such as system cost increase, and achieve high output power quality and output current The effect of small ripple

Inactive Publication Date: 2020-06-02
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the HERIC topology requires at least six switching devices and six anti-parallel diodes, resulting in increased system cost

Method used

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  • Gating unit and efficient non-isolated three-level grid-connected inverter
  • Gating unit and efficient non-isolated three-level grid-connected inverter
  • Gating unit and efficient non-isolated three-level grid-connected inverter

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Embodiment Construction

[0056] In the high-efficiency non-isolated three-level grid-connected inverter provided in the embodiment of the present application, the output voltages include: +Vdc, 0 and -Vdc, which can be represented by three levels of +1, 0 and -1 respectively . The output of the inverter includes five situations: output +1 level (+Vdc) and active power, output +1 level and reactive power, output -1 level and active power, output -1 level (-Vdc ) and reactive power, output 0 level, respectively corresponding to the first to fifth working modes of the inverter. Among them, Vdc represents the DC input voltage.

[0057] According to one embodiment of the present application, a gating unit is provided, including:

[0058] A gating circuit module has four terminals of the first terminal, the second terminal, the third terminal and the fourth terminal, and provides five working modes under the control of the control signal:

[0059] In the first working mode, the control turns on the conne...

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Abstract

The invention discloses a gating unit and an efficient non-isolated three-level grid-connected inverter, and belongs to the field of inverters. The gating unit comprises a gating circuit module, and the gating circuit module is provided with a first terminal, a second terminal, a third terminal and a fourth terminal; five working modes are provided under the control of control signals, and under the five different working modes, connection and disconnection between different terminals are controlled respectively, so a common-mode voltage can keep a constant value in each working mode. The efficient non-isolated three-level grid-connected inverter comprises one gating unit; compared with an HERIC topological structure, the inverter saves one active switch at the aspect of the number of devices, and due to the fact that in an inverter system, the cost of the active switch occupies a large proportion, the cost is saved. According to the invention, the problem of current leakage of the inverter is effectively solved, in addition, a unipolar pulse width modulation mode is adopted, the output current ripple is small, and the output electric energy quality is high.

Description

technical field [0001] The embodiments of the present application relate to the field of inverters, in particular to a gating unit and a high-efficiency non-isolated three-level grid-connected inverter. Background technique [0002] The structure of the non-isolated grid-connected inverter does not contain a transformer. It has the advantages of high conversion efficiency, low volume, weight and cost. The highest conversion efficiency of the system can reach more than 98%, and it has quickly attracted the attention of scientific researchers from various countries and sought after by the industry. It was first applied in European countries, and other countries and regions also showed great interest in non-isolated grid-connected inverters. There are two types of non-isolated grid-connected inverters: single-stage and double-stage. The single-stage type is suitable for higher DC input voltage, requiring the minimum input voltage not to be lower than the peak value of the grid...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M7/539
CPCH02M7/483H02M7/539H02M1/0038
Inventor 汪洪亮朱晓楠岳秀梅
Owner HUNAN UNIV
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