Non-isolated type multi-level inverter circuit and modulation control method thereof

A multi-level inverter, non-isolated technology, applied in electrical components, conversion devices for converting AC power input to DC power output, and output power, etc. problems such as low wave content, to achieve the effects of good practicability, low-cost inverter, and low harmonic content

Inactive Publication Date: 2016-08-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The output harmonic content of MMC modular multilevel converter is low, but the number of power electronic components is large, and the switching frequency is too high, resulting in high cost and large loss.

Method used

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  • Non-isolated type multi-level inverter circuit and modulation control method thereof
  • Non-isolated type multi-level inverter circuit and modulation control method thereof
  • Non-isolated type multi-level inverter circuit and modulation control method thereof

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Embodiment Construction

[0020] See Figure 1 to Figure 3 , a non-isolated multilevel inverter circuit, including a DC power supply 1 and an AC load output terminal 2, the DC power supply 1 includes a first DC power supply 11 and a second DC power supply 12 connected in series, in the DC power supply 1 and the AC load output terminal 2 are provided with at least two buck chopper circuits 3 connected in parallel, one end of the upper buck chopper circuit is connected to the positive pole of the DC power supply, the other end is connected to the AC load output terminal, and the middle connection One end of the circuit is connected to the connection point of the first DC power supply and the second DC power supply, the other end is connected to the output terminal of the AC load and the intermediate connection circuit is grounded, one end of the lower buck chopper circuit is connected to the negative pole of the DC power supply, and the other end is connected to the negative pole of the DC power supply. ...

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Abstract

The invention discloses a non-isolated type multi-level inverter circuit. The non-isolated type multi-level inverter circuit comprises DC (direct-current) power sources and an AC (alternating-current) load output end, wherein the DC power sources comprise a first DC power source and a second DC power source; at least two buck chopper circuits connected in parallel are arranged between the DC power sources and the AC load output end; unilateral diodes and capacitors are arranged between a middle connecting circuit and the buck chopper circuits at the upper part and between the middle connecting circuit and the buck chopper circuits at the lower part. The non-isolated type multi-level inverter circuit is simple in structure, good in use stability, high in applicability and good in practicability, realizes inversion of low harmonic content and low cost and greatly reduces cost and loss. Meanwhile, the invention discloses a modulation control method of the non-isolated type multi-level inverter circuit. The method of the non-isolated type multi-level inverter circuit is convenient to operate, can effectively and rapidly realize inversion operation, and is high in applicability and good in practicability.

Description

technical field [0001] The invention belongs to the technical field of power electronic conversion, and in particular relates to a non-isolated multilevel inverter circuit and a modulation control method thereof. Background technique [0002] In recent years, with the development of photovoltaic power generation, large-capacity energy storage devices, electric vehicles, and flexible DC transmission technology, there is an increasing need for a low-cost, high-efficiency, and low-output harmonic content inverter to perform DC Inverter grid-connected or used for AC load. [0003] Traditional converters are divided into two-point level converters and multi-level converters according to the number of levels. The main circuit structure of the multi-level inverter can be divided into three types in principle: the first is a clamped multi-level structure; The third type is a sub-module unit composed of capacitors and half-bridge switching devices, and the multi-level output struct...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M7/539
CPCH02M7/483H02M7/539
Inventor 卢亮宇王银顺牟敏徐记凤阚常涛刘文飞付瑜
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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