High-gain Z-source inverter

A source inverter, high-gain technology, applied in the field of high-gain Z-source inverters, can solve the problem of increasing voltage stress and current stress of switching devices, limited boosting capability of Z-source inverters, increasing system losses and instability and other problems, to achieve the effect of enhancing the boosting ability, increasing the anti-interference ability, and reducing the voltage stress of the capacitor

Inactive Publication Date: 2011-10-19
HARBIN INST OF TECH AT WEIHAI
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  • Description
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Problems solved by technology

[0004] Although the Z-source inverter can theoretically have infinite boost capability, it cannot actually achieve infinite gain due to the influence of component parasitic parameters, and too high boost will increase system loss and instability; on the other hand, The through duty cycle and the modulation factor are mutually restr

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Embodiment Construction

[0013] The following is attached image 3 The main circuit of the high-gain Z-source inverter of the present invention is introduced in detail.

[0014] The high-gain Z-source inverter includes a three-phase inverter composed of a DC voltage source and a three-phase inverter bridge, and also includes an X-type Z-source impedance network composed of switched inductors and capacitors, and a power diode. The power diode It is used to block the inductance current return; wherein the inductance in the X-type Z source impedance network includes the first switch inductance branch and the second switch inductance branch, and the first switch inductance branch is the first inductance ( L 1 ) and the third inductor (L 3 ) parallel charging, the first inductance (L 1 ) and the third inductor (L 3 ) is discharged in series, the second inductance (L 2 ) and the fourth inductor (L 4 ) parallel charging, the second inductance (L 2 ) and the fourth inductor (L 4 ) is discharged in ser...

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Abstract

The invention provides a high-gain Z-source inverter, comprising a three-phase inverter, which is composed of a direct-current voltage source and a three-phase inversion bridge. The high-gain Z-source inverter further comprises a Z-source network, which is composed of a power diode, a switch inductor and a capacitor. The high-gain Z-source inverter is characterized in that a single inductor is replaced by a branch circuit of the switch inductor; the head end of the Z-source network is connected with the positive electrode of a power supply; the tail end of the Z-source network is connected to the positive end of the three-phase inversion bridge; and the inversion bridge and the power supply are grounded commonly. Compared with the traditional Z-source inverter, the Z-source inverter disclosed by the invention is capable of improving the boost capacity of the inverter, realizing a high modulation factor and improving the output quality of the whole inverter; and simultaneously, the voltage stress of the Z-network capacitor can be effectively reduced so as to reduce the volume and the weight of the inverter.

Description

1. Technical field [0001] The high-gain Z-source inverter involved in the present invention belongs to power electronic converters. 2. Background technology [0002] People are paying more and more attention to clean energy. Wind power generation, photovoltaic power generation and fuel cells are favored by the industry, but the DC voltage output by wind power generation, photovoltaic power generation and fuel cell systems fluctuates greatly and cannot directly supply power to users. In order to achieve stable power output for step-up and step-down, a DC / DC step-up circuit is added to the front stage of the inverter bridge as shown in the attached figure 1 As shown, but the link of the DC / DC converter increases the cost of the system and reduces the efficiency of the system, and the two-stage structure increases the complexity of the system control. [0003] Literature (F.Z.Peng, "Z-source Inverter," IEEE Trans.on Industry Applications, vol.39, no.2, pp, 504-510, March / April...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02M7/5387
Inventor 蔡春伟曲延滨刘芳李军远张扬
Owner HARBIN INST OF TECH AT WEIHAI
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