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Standard Z source three-level T-shaped inverter and SVPWM method thereof

A modulation method and three-level technology, which are used in electrical components, AC power input to DC power output, output power conversion devices, etc. and other problems, to achieve the effect of reducing the number of components, increasing reliability, and reducing switching loss

Inactive Publication Date: 2014-10-08
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

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  • Standard Z source three-level T-shaped inverter and SVPWM method thereof
  • Standard Z source three-level T-shaped inverter and SVPWM method thereof
  • Standard Z source three-level T-shaped inverter and SVPWM method thereof

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0048] Such as figure 1 As shown, a quasi-Z source three-level T-type inverter includes three-phase bridge arms connected in parallel, each phase bridge arm includes two series-connected IGBT tubes, and one side of the midpoint of each phase bridge arm is connected in series in two directions Different IGBT tubes, the other side is connected to the resistor through the filter; the input terminal of each bridge arm connected in parallel is connected to the quasi-Z source network and then connected to the input voltage source; the two capacitor connections in the quasi-Z source are connected to the One end of the two IGBT tubes in different directions, each IGBT tube is driven by the control circuit.

[0049] The quasi-Z source network includes four inductances and capacitors, the positive pole of the voltage source is connected to an inductance, and the...

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Abstract

The invention relates to a standard Z source three-level T-shaped inverter and an SVPWM method thereof. A topology has boost features identical to boost features of a standard Z source network three-level NPC inverter, however, few switching elements are utilized, and efficiency is high. Compared with a three-level T-shaped inverter, functions of boost and voltage reduction of the topology can be achieved, direct connection of an upper bridge arm and a lower bridge arm is allowed, reliability is improved remarkably, dead time is eliminated, and waveform distortion is prevented. Compared with a Z source three-level diode clamped inverter, current at an input end is continuous, ripple waves are small, and the input end does not need to be connected with a large-capacitance array set in parallel. Compared with a standard Z source two-level inverter, output voltage has neutral point electric potentials, therefore, high frequency harmonic waves are small, a required filter is small, a switching frequency can be reduced, and switching loss is less. The SVPWM method is adopted to control the inverter, so that switching frequencies are decreased, switching loss is reduced, and harmonic contents of the output voltage are reduced.

Description

technical field [0001] The invention relates to a quasi-Z source three-level T-type inverter and a SVPWM modulation 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 (EMI). fields are 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 researchers added a DC / DC c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5395H02M1/14
Inventor 张承慧邢相洋陈阿莲
Owner SHANDONG UNIV
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