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Neutral-point potential balance method for T-type three-level inverter based on resultant medium vector

A three-level inverter and synthetic vector technology, which is applied in the direction of electrical components, output power conversion devices, AC power input conversion to DC power output, etc., can solve the problem of shortening capacitor life, DC bus capacitor and switching device withstand voltage Problems such as imbalance and midpoint potential imbalance

Active Publication Date: 2017-05-24
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0003] However, like the diode-clamped three-level inverter, the T-type three-level inverter also has the problem of unbalanced midpoint potential, which leads to the unbalanced voltage of the DC bus capacitor and switching devices, and the harmonic content of the output voltage and current. large, shorten capacitor life

Method used

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  • Neutral-point potential balance method for T-type three-level inverter based on resultant medium vector
  • Neutral-point potential balance method for T-type three-level inverter based on resultant medium vector
  • Neutral-point potential balance method for T-type three-level inverter based on resultant medium vector

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Embodiment

[0066] figure 1 The structure diagram of the T-type three-level inverter is given, including three bridge arms connected in parallel, each phase bridge arm includes two series-connected IGBT switch tubes, and two IGBT switches in different directions are connected in series on one side of the midpoint of each phase bridge arm. The other side of the IGBT tube is connected to the load; the same DC voltage source is connected to each bridge arm end in parallel; the midpoint of the two midpoint clamping capacitors connected in parallel to the input voltage source is connected to the two directions of each phase bridge arm in different directions One end of the IGBT tube; each IGBT tube is driven by the control circuit.

[0067] The method for balancing the midpoint potential of a T-type three-level inverter based on the synthesized vector, the specific implementation includes four steps: S1, according to the traditional recent three-vector space vector modulation method, select th...

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Abstract

The invention discloses a neutral-point potential balance method for a T-type three-level inverter based on a resultant medium vector, and the method comprises the following steps: S1, selecting corresponding initial resultant vectors through a reference voltage vector according to a conventional nearest three-vector space vector modulation method, and determining the function duty ratio of each initial resultant vector; S2, eliminating a medium vector through a method of synthesizing the medium vector through two big vectors, and obtaining a new resultant vector and the function duty ratio of the new resultant vector; S3, selecting a basic switch vector, and determining a modulation sequence of the basic switch vector; S4, adjusting the function duty ratios of two redundant small vectors through employing a dead-beat control method. The method is small in calculation burden, is easy to implement, does not need an additional hardware circuit, and is low in cost. The method can nearly eliminate the neutral-point voltage fluctuation completely, and reduces the total harmonic distortion of an output current.

Description

technical field [0001] The invention relates to the technical field of inverter midpoint potential balance, in particular to a T-type three-level inverter midpoint potential balance method based on a synthetic neutral vector. Background technique [0002] With the rapid development of distributed power, energy storage systems, electric vehicles and other fields, the requirements for power quality and system efficiency are also getting higher and higher. Compared with the traditional two-level inverter, the three-level inverter has the advantages of less harmonics, less voltage stress of the switching tube, high withstand voltage, and less electromagnetic interference. Compared with the diode-clamped three-level inverter, the T-type three-level inverter has two main advantages: when the output phase voltage is positive or negative, only one switch is turned on, reducing the Turn-on loss; the effective value of the current flowing through each switch tube in a power frequency...

Claims

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Application Information

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IPC IPC(8): H02M7/487
CPCH02M7/487
Inventor 康龙云冯腾胡毕华冯元彬王则沣
Owner SOUTH CHINA UNIV OF TECH
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