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Three-phase mixing multi-level inverter circuit

A hybrid multi-level and inverter circuit technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve problems such as unsatisfactory requirements, reduce output harmonics, improve Effects of improving power quality and reliability

Inactive Publication Date: 2009-07-29
SHANGHAI MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, with the rapid development of the electronics industry, the application of electronic components is becoming more and more extensive, and the requirements for inverter circuits are also higher. The existing two-level and three-level methods are gradually unable to meet the demand. Circuits capable of outputting multiple levels

Method used

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  • Three-phase mixing multi-level inverter circuit

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Embodiment

[0025] see figure 1 , the single-phase hybrid multi-level inverter circuit proposed by the present invention is composed of a unit A0, a unit Aa1, a unit Ab1, and a unit Ac1 connected in cascade. The unit A0 is a diode-clamped three-level bridge circuit (3H bridge), and the unit Aa1, unit Ab1, and unit Ac1 are respectively an asymmetric four-level asymmetric bridge circuit (4A bridge), Call it 4A / 3H hybrid multilevel topology. v a01 , v a11 , v a12 , v b11 , v b12 , v c11 and v c12 They are independent DC power sources, which can be rectified by solar energy, wind energy, fuel cells, storage batteries or isolated transformers.

[0026] The output of the hybrid multilevel inverter circuit is obtained by superimposing the output of the asymmetric unit and the 3H bridge, which can be expressed by Equation 1:

[0027] v Ag =v ag +v ag1

[0028] v Bg =v bg +v bg1

[0029] v Cg =v cg +v cg1

[0030] (1)

[0031] Among them, v Ag , v Bg and v Cg Respectively ...

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Abstract

The invention discloses a three-phase hybrid multilevel inverter circuit, which is formed by cascading a level circuit module and a bridge circuit module. The bridge circuit module is a three-phase bridge circuit module which consists of a direct current supply, a clamp diode and a capacitor; the level circuit module is an asymmetric four-level circuit module which consists of a direct current supply, a clamp diode and an asymmetric four-level converter; and the output of the three-phase hybrid multilevel inverter circuit equals to the superposition sum of the outputs of each cascaded unit. By adopting different modulation methods, a multi-level output can be realized and the number of the output levels can be changed by changing the voltage ratio of the input current. The input direct current supply can be acquired by the solar energy, wind energy, fuel cells, storage batteries or isolated transformer rectifier units. Forming a hybrid cascaded multilevel converter by cascading the symmetric multilevel converter and the three-phase bridge circuit, the three-phase hybrid multilevel inverter circuit has the advantages of improving the output power quality, reducing the output harmonic waves and enhancing the reliability of the system due to the ability for outputting a plurality of levels.

Description

technical field [0001] The invention relates to an inverter circuit, in particular to a three-phase hybrid multilevel inverter circuit. Background technique [0002] There are usually two types of current inverter circuits: two-level and three-level, among which the two-level topology is more common and widely used. However, with the increasing functions of electronic components, an inverter circuit with higher requirements is often required. The circuit that realizes the inverter process is also called an inverter, and the DC power is converted into the AC power that people need through the inverter. [0003] Multilevel converters have become a current research hotspot due to their characteristics of small output waveform distortion, small dv / dt and small system EMI, and are more and more widely used in high-power motor drives and AC-DC transmission. However, the current multilevel converters have various shortcomings, especially when the number of output levels increases,...

Claims

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Application Information

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IPC IPC(8): H02M7/483
Inventor 韩金刚汤天浩王天真
Owner SHANGHAI MARITIME UNIVERSITY
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