A leakage current suppression method for a three-phase four-leg z-source inverter

A technology of three-phase four-leg and source inverter, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., to achieve a simple effect

Active Publication Date: 2021-04-13
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] In order to solve the problem of leakage current in non-isolated systems, the present invention provides a method for suppressing leakage current of a three-phase four-arm Z-source inverter

Method used

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  • A leakage current suppression method for a three-phase four-leg z-source inverter
  • A leakage current suppression method for a three-phase four-leg z-source inverter
  • A leakage current suppression method for a three-phase four-leg z-source inverter

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] figure 1 It is a three-phase four-arm Z-source photovoltaic inverter topology.

[0033] A method for suppressing leakage current of a three-phase four-leg Z-source inverter, comprising the steps of: comparing three-phase symmetrical sine waves with triangular carrier waves with a phase difference of 120° to obtain three-phase logic signals of A, B, and C; XOR the logic signals of the three phases A, B, and C to obtain the D-phase logic signal; according to the area where the modulation wave is located, select a specific carrier and compare it with the positive and negative through voltage signals to obtain the through control signal; A, B, C, D The logic signals of the four bridge arms are ORed with the through signal to obtain the control signal of the final switching tube.

[0034] details as follows:

[0035] (1) figure 2 Shown are three triang...

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Abstract

The invention discloses a method for suppressing leakage current of a three-phase four-arm Z-source inverter, which comprises the steps of: comparing three-phase symmetrical sine waves with triangular carrier waves with a phase difference of 120° to obtain three-phase A, B, and C Logic signal; XOR the logic signals of the three phases A, B, and C to obtain the D-phase logic signal; according to the area where the modulating wave is located, select a specific carrier and compare it with the positive and negative through voltage signals to obtain the through control signal; A, B The logic signals of the four bridge arms , C, and D are phase-ORed with the through signal to obtain the control signal of the final switching tube. In the present invention, no matter what mode the circuit is in, the common-mode voltage remains constant, so that the leakage current is controlled within the allowable range. Moreover, the modulation method does not have a complicated calculation process and is easy to implement.

Description

technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to a method for suppressing leakage current of a three-phase four-arm Z-source inverter. Background technique [0002] Solar energy is a kind of renewable energy, which has the advantages of low cost, clean and pollution-free, and widely distributed. Among them, photovoltaic power generation is one of the most effective forms of utilizing solar energy. As an important part of energy conversion, photovoltaic inverters are also particularly important whether they can operate reliably and efficiently. [0003] Compared with the traditional inverter, the three-phase four-leg Z-source inverter can maintain a symmetrical output voltage when connected to an unbalanced load; it has a single-stage buck-boost capability, which reduces system complexity and improves system efficiency; allows short-term In the straight-through state, there is no need to add dead time to av...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M7/5387
CPCH02M1/32H02M7/5387H02M1/0038
Inventor 彭璠周国华高思雅徐能谋
Owner SOUTHWEST JIAOTONG UNIV
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