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A Z-source three-level T-type inverter and its mid-point balance control method

A three-level, inverter technology, used in electrical components, AC power input to DC power output, output power conversion devices, etc., can solve the problem of output voltage output is not constant, difficult to boost and neutral , Unable to achieve wide output voltage and other problems, to achieve the effect of increasing reliability, reducing the number of components, and reducing high-frequency harmonics

Active Publication Date: 2017-04-12
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For three-level T-type inverters, the efficiency and power quality are better than those of Z-source three-level NPC and Z-source two-level inverters, but for the output voltage of distributed power sources such as fuel cells and photovoltaic cells The output is not constant, the wide output voltage cannot be achieved, and the harmonics are very large due to the dead zone
[0006] Moreover, the Z-source three-level inverter has an inherent problem of unbalanced midpoint potential.
It is difficult to achieve boost and midpoint balance with traditional methods

Method used

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  • A Z-source three-level T-type inverter and its mid-point balance control method
  • A Z-source three-level T-type inverter and its mid-point balance control method
  • A Z-source three-level T-type inverter and its mid-point balance control method

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0052] Such as figure 1 As shown, each bridge arm includes two IGBT tubes in series, the left side of the midpoint of each phase bridge arm is connected to two IGBT tubes in opposite directions, and the right side of the midpoint of each phase bridge arm is connected to the corresponding resistor through a filter; A pair of capacitors C1 and C2 are connected in parallel at the input ends of each bridge arm connected in parallel. The left side of capacitor C1 and capacitor C2 is connected to the input voltage; the right side of capacitor C1 and capacitor C2 is connected to the Z source network. Each bridge arm The two IGBT tubes with opposite directions are connected to the midpoint of the capacitors C1 and C2. Figure 3a It is the equivalent circuit diagram of the Z-source three-level T-type inverter in the non-straight-through state; Figure 3b It i...

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Abstract

The invention relates to a Z-source three-level T-type inverter and a neutral-point balance control method thereof. A topology has an identical step-up characteristic with a Z-source network three-level neutral-point clamped (NPC) inverter, but uses comparatively fewer switching devices and has higher efficiency. Compared with a three-level T-type inverter, the topology is capable of realizing a step-up / step-down function and allows direction connection of upper and lower bridge arms so that the reliability is improved obviously, dead time is eliminated and waveform distortion is prevented. Compared with a Z-source two-level inverter, an output voltage has a neutral-point level so that high-frequency harmonic waves are low and a needed filter is smaller. Because three levels are closer to sine waves than two levels, switching frequency can be reduced and switching loss is lower. An SVPWM control strategy is adopted and a three-level SVPWM is converted into a two-level SVPWM and then neutral-point balance and step-up are realized on the basis of the two-level SVPWM. The method is capable of simply eliminating neutral-point balance and direct-connection coupling.

Description

technical field [0001] The invention relates to a Z-source three-level T-type inverter and a midpoint balance control method thereof. Background technique [0002] With the rapid development of distributed power and the continuous improvement of efficiency requirements, improving power quality, reducing harmonic pollution, and improving the efficiency of power generation systems are key issues in the development of distributed power. Compared with the traditional two-level inverter, the three-level inverter has the advantages of less harmonics, high withstand voltage, small switch stress, and less electromagnetic interference (Electro Magnetic Interference, EMI). be widely used. However, the output voltage of distributed power sources such as fuel cells and photovoltaic cells is not constant, and it is impossible to realize the conversion function of a wide DC voltage range and obtain a higher AC output voltage. In order to meet the wide voltage range of the DC bus, the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/537
Inventor 张承慧邢相洋陈阿莲
Owner SHANDONG UNIV
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