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Leakage current suppression method of three-phase four-bridge-arm Z-source inverter

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

Active Publication Date: 2020-06-16
SOUTHWEST JIAOTONG UNIV
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  • Application Information

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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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  • Leakage current suppression method of three-phase four-bridge-arm Z-source inverter
  • Leakage current suppression method of three-phase four-bridge-arm Z-source inverter
  • Leakage current suppression method of three-phase four-bridge-arm 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 leakage current suppression method of a three-phase four-bridge-arm Z-source inverter. The method comprises the following steps: respectively comparing three-phase symmetrical sine waves with triangular carriers with phase difference of 120 degrees to obtain A, B and C three phases of logic signals; carrying out exclusive OR on the A, B and C three phases of logic signalsto obtain a D-phase logic signal; according to the area where the modulation wave is located, selecting a specific carrier wave to be compared with positive and negative direct-connection voltage signals to obtain a direct-connection control signal; and carrying out OR on the A, B, C and D four bridge-arm logic signals and the direct-connection signals to obtain a final control signal of the switching tube. According to the invention, no matter what mode the circuit is in, the common-mode voltage is kept constant, so that the leakage current is controlled within an allowable range; and moreover, the modulation mode has no complex calculation process, and is simple 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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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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