Single-tap-inductor Z-source inverter

A source inverter, tapped inductor technology, applied in electrical components, high-efficiency power electronic conversion, conversion of AC power input to DC power output, etc. and other problems, to achieve the effects of suppressing resonant current, large voltage gain, and reducing voltage stress

Active Publication Date: 2016-03-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of the existing Z-source inverters, such as limited boosting capacity, large device voltage stress, non-common ground, and resonance current during startup, due to the limited direct-through time of the existing Z-source inverter, and provides a single-tap inductance Z-source inverter

Method used

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specific Embodiment approach 1

[0029] Specific implementation mode one: the following combination Figure 2-Figure 4 Describe this embodiment, the single-tap inductance Z source inverter described in this embodiment includes a three-phase inverter 1 and an output filter 2, it also includes a single-tap inductance Z source network 3, and the DC power output terminal is connected to a single The input terminal of the tapped inductor Z source network 3, the output terminal of the single-tap inductor Z source network 3 is connected to the input terminal of the three-phase inverter 1, the output terminal of the three-phase inverter 1 is connected to the input terminal of the output filter 2, and the output The output voltage of the output terminal of the filter 2 supplies power for the load;

[0030] The single-tap inductor Z source network 3 includes a capacitor C, a tap inductor L, a diode D1, a diode D2, a diode D3 and an insulated gate bipolar transistor S1;

[0031] The positive output terminal of the DC p...

specific Embodiment approach 2

[0033] Specific implementation mode two: the following combination Figure 2-Figure 4 This embodiment will be described. This embodiment will further explain Embodiment 1. The modulation method of the boost control mode of the single-tap inductance Z-source inverter is:

[0034] Setting up a single-tap inductor Z-source inverter involves two states:

[0035] State 1, straight-through state: turn off the insulated gate bipolar transistor S1, so that the upper and lower bridge arms of the three-phase inverter 1 are straight-through, and at this time the single-tap inductor Z source network 3 is disconnected from the three-phase inverter 1 ;

[0036] State 2, non-straight-through state: make the three-phase inverter 1 in the normal working state, turn on the insulated gate bipolar transistor S1, and at this time, the single-tap inductance Z source network 3 and the three-phase inverter 1 provide energy for the load at the same time;

[0037] Set in a switching cycle T, the dura...

specific Embodiment approach 3

[0070] Specific implementation mode three: the following combination Figure 5-Figure 7 This embodiment will be described. This embodiment will further describe the first embodiment. The modulation method of the space vector of the single-tap inductance Z-source inverter is:

[0071] In the modulation method, there are 6 effective voltage vectors, 2 zero voltage vectors and 3 through vectors, among which the 6 effective voltage vectors differ by 60° in turn, and the direction is fixed. The space is divided into six sectors, and the 2 zero voltage vectors are fixed At the origin of the space vector diagram, the three through vectors are generated by the three pairs of bridge arms of the three-phase inverter 1, and the reference vector passes through two adjacent effective voltage vectors U u , U v and the corresponding zero voltage vector U 00 synthesis, through the vector U shoot A boost is achieved where the duty cycles of the two effective voltage vectors are d u and d ...

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Abstract

A single-tap-inductor Z-source inverter belongs to the technical field of an inverter. The single-tap-inductor Z-source inverter settles the problems of relatively low voltage boosting capability caused by short direct conduction time, high device voltage stress, no common-ground, and resonance current in starting in an existing Z-source inverter. A single-tap-inductor Z-source network comprises a capacitor C, an tap inductor L, diodes (D1,D2,D3) and an insulated gate bipolar transistor. The anode output end of a DC power supply is connected with the anode end of the tap inductor L. The middle tap of the tap inductor L is connected with the anode of diode D1. The cathode end of the tap inductor L is connected with the anode of the diode D3. The cathode of the diode D1 is connected with the anode input end of a three-phase inverter, the cathode of the diode D3, the anode of the diode D2 and the emitter electrode of the insulated gate bipolar transistor. The collector electrode of the insulated gate bipolar transistor is connected with the cathode of the diode D2 and one end of the capacitor C. The other end of the capacitor C is connected with the cathode input end of the DC power supply and the cathode input end of the three-phase inverter. The single-tap-inductor Z-source inverter is used for an AC power supply.

Description

technical field [0001] The invention belongs to the technical field of inverters. Background technique [0002] As an AC power supply, voltage source inverters are widely used in AC motor drive systems, UPS, induction heating systems, battery distributed AC power supplies, static var generators and other fields. The traditional three-phase voltage source inverter converts DC to AC to supply power to the load through the inverter. However, because the traditional inverter power supply cannot achieve boost control, its application is subject to many restrictions, and in order to prevent the bridge arm from passing through If the device is damaged, the dead time needs to be set, which will affect the quality of the output waveform and increase the harmonic content. [0003] In order to solve the above problems, a Z-source inverter is proposed, such as figure 1 As shown, it has the characteristics of flexible input power, no need for large-capacity energy storage components, c...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M1/32
CPCH02M1/32H02M7/4826H02M7/53875H02M1/0038H02M1/0048H02M7/53876Y02B70/10
Inventor 刘洪臣纪玉亮
Owner HARBIN INST OF TECH
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