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A single-phase five-level topology and inverter

A five-level, topology technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., to achieve the effects of improving operating efficiency, reducing current harmonic content, and suppressing common-mode voltage

Active Publication Date: 2016-12-28
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, it is necessary to add additional hardware circuits or sacrifice the voltage utilization of the inverter to achieve the balance of capacitor voltage

Method used

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  • A single-phase five-level topology and inverter
  • A single-phase five-level topology and inverter
  • A single-phase five-level topology and inverter

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Embodiment Construction

[0075] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0076] See figure 1 This figure is a schematic diagram of Embodiment 1 of a single-phase five-level topology provided by the present invention.

[0077] It should be noted, figure 1 Shown is a schematic diagram of a single-phase half-bridge five-level topology.

[0078] The single-phase five-level topology provided in this embodiment includes: a first capacitor C1, a three-level bridge arm module, and four switching tubes, the four switching tubes being the first switching tube T1 and the fifth switching tube T5, respectively , The sixth switching tube T6 and the eighth switching tube T8; each of the switching tubes is connected in reverse parallel with a diode;

[0079] The first terminal of the first switch tube T1 is con...

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Abstract

The present invention provides a single-phase five-level topology and an inverter. The single-phase five-level topology includes: a first capacitor, a three-level bridge arm module and four switch tubes, and the four switch tubes are respectively the first switch tubes , the fifth switch tube, the sixth switch tube and the eighth switch tube; each switch tube is connected in reverse parallel with a diode; the three-level bridge arm module includes two switch tubes and a double switch unit, and the first switch tube of the third switch tube terminal connected to the first node, the second end of the third switch tube is connected to the neutral point N through the double switch unit; the first end of the fourth switch tube is connected to N through the double switch unit, and the second end of the fourth switch tube is connected to the first node Two nodes. Output five level states, reduce the current harmonic content of the system, reduce the filter inductance, increase the voltage level, suppress the common mode voltage, and improve the operating efficiency. The balance control of the capacitor voltage under full power and full modulation can be realized without adding additional hardware circuits, and the phase output voltage of the system can be prevented from degrading from five-level to three-level.

Description

Technical field [0001] The present invention relates to the technical field of power electronics, in particular to a single-phase five-level topology and an inverter. Background technique [0002] In the field of new energy such as solar power generation and wind power generation, multi-level inverters have high output power, low device switching frequency, high system equivalent switching frequency, low output harmonics, fast dynamic response, wide transmission frequency, and electromagnetic compatibility. Characteristics such as good sex are getting more and more attention. At present, the most researched multi-level circuits are diode-clamped multi-level circuits. Among them, the diode-clamped three-level circuit has been successfully used in the fields of photovoltaic inverters and wind turbine converters. [0003] However, diode-clamped four-level and above inverters use multiple capacitors connected in series across the DC side. Each switch tube in the inverter is connecte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/487H02M1/0095H02M7/4837
Inventor 邹海晏陶磊张建王艾胡勇
Owner SUNGROW POWER SUPPLY CO LTD
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