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Single-phase five-level topology and inverter

A five-level, inverter technology, used in electrical components, AC power input to DC power output, output power conversion devices, etc. Effect

Active Publication Date: 2014-12-17
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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  • Single-phase five-level topology and inverter
  • Single-phase five-level topology and inverter
  • Single-phase five-level topology and inverter

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Embodiment Construction

[0075] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0076] see figure 1 , which is a schematic diagram of Embodiment 1 of the 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 switch tubes, and the four switch tubes are respectively the first switch tube T1 and the fifth switch tube T5 , 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 end of the first switching tube T1 is connected to the positive po...

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Abstract

The invention provides a single-phase five-level topology and an inverter. The single-phase five-level topology comprises a first capacitor, a three-level bridge arm module and four switching tubes, wherein the four switching tubes refer to a first switching tube, a fifth switching tube, a sixth switching tube and an eighth switching tube respectively; each switching tube is reversely connected in parallel with a diode; the three-level bridge arm module comprises two switching tubes and a double-switch unit; the first end of a third switching tube is connected with a first node, and the second end of the third switching tube is connected with a neutral point N through the double-switch unit; and the first end of a fourth switching tube is connected with N through the double-switch unit, and the second end of the fourth switching tube is connected with a second node. Five level states are output, the current harmonic content of a system is reduced, the filter inductance is reduced, the voltage level is raised, the common-mode voltage is restrained, and the running efficiency is increased. Balanced control of capacitor voltage under full power and full modulation can be realized without adding an additional hardware circuit, and the phase output voltage of the system is prevented from degrading from five levels to three levels.

Description

technical field [0001] The 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 new energy fields such as solar power generation and wind power generation, multi-level inverters have high output power, low switching frequency of devices, high equivalent switching frequency of the system, small output harmonics, fast dynamic response, wide transmission frequency bandwidth, and electromagnetic compatibility. More and more attention has been paid to characteristics such as good sex. The more multi-level circuits studied at present are diode clamping multi-level circuits. Among them, the diode-embedded three-level circuit has been successfully applied in the fields of photovoltaic inverters and wind turbine converters. [0003] However, diode-clamped four-level and above-level inverters use multiple capacitors connected in series across the two ends of the DC side. ...

Claims

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Application Information

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Patent Type & Authority Applications(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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