CN103532413A - Topological structure of switched inductor inverted L-shaped Z source inverter - Google Patents

Topological structure of switched inductor inverted L-shaped Z source inverter Download PDF

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Publication number
CN103532413A
CN103532413A CN201310437204.7A CN201310437204A CN103532413A CN 103532413 A CN103532413 A CN 103532413A CN 201310437204 A CN201310437204 A CN 201310437204A CN 103532413 A CN103532413 A CN 103532413A
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China
Prior art keywords
inverter
source
inductance
diode
type
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CN201310437204.7A
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Chinese (zh)
Inventor
潘雷
孙鹤旭
梁茵
王贝贝
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Hebei University of Technology
Tianjin Chengjian University
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Hebei University of Technology
Tianjin Chengjian University
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Priority to CN201310437204.7A priority Critical patent/CN103532413A/en
Publication of CN103532413A publication Critical patent/CN103532413A/en
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Abstract

The invention discloses a topological structure of a switched inductor inverted L-shaped Z source inverter. The topological structure comprises a direct current power supply and an inverter bridge, and is characterized in that an inverted L-shaped Z source network containing a switched inductor unit is additionally arranged between the direct current power supply and the inverter bridge, i.e., the front end of the inverter bridge is connected with the inverted L-shaped Z source network containing the switched inductor unit. The topological structure has the effects that the capacitor voltage stress in the Z source network is kept to be double of the voltage of the direct current power supply all the time by the inverter during voltage amplification, and the capacitor voltage stress in the conventional Z source inverter is prevented from being increased with the increase in short-through duty ratio; compared with the conventional Z source inverter and the switched inductor Z source inverter, the inverter has the advantage that the inductance current stress is reduced under the condition of the same voltage gain, the voltage gain when the short-through duty ratio is extremely small is improved, and the influence of impact current on the inverter bridge at the start-up of the system can be avoided.

Description

Switched inductors Γ type Z-source inverter topological structure
Technical field
The present invention relates to a kind of switched inductors Γ type Z-source inverter topological structure.
Background technology
The topological structure of existing Z-source inverter has multiple, as: traditional Z source inventer as shown in Figure 2, accurate Z-source inverter as shown in Figure 3, switched inductors Z-source inverter as shown in Figure 4 and accurate switched inductors Z-source inverter as shown in Figure 5 etc.From Fig. 2~5, can find out, in above various Z-source inverters, except having inductance, all contain two capacity cells, and the voltage stress of electric capacity increases along with the increase of straight-through duty ratio.Because capacitance voltage stress range is larger, this will reduce the useful life of electric capacity, and has limited the size of straight-through duty ratio; While starting, may there is impulse current in system; In addition, in above Z-source inverter, inductive current stress is larger.
Summary of the invention
For above problem, the topological structure that the object of this invention is to provide a kind of switched inductors Γ type Z-source inverter, in the Z source network of this inverter, only contain a capacity cell, and to make capacitance voltage stress be certain value, and reduced inductive current stress under identical voltage gain condition.
For achieving the above object, the technical solution used in the present invention is: a kind of switched inductors Γ type Z-source inverter topological structure, this topological structure includes DC power supply, inverter bridge, it is characterized in that: between described DC power supply and inverter bridge, add a Γ type Z source network that contains switched inductors unit, the front end in inverter bridge connects the Γ type Z source network that contains switched inductors unit.
The described Γ type Z source network that contains switched inductors unit comprises three inductance, an electric capacity and four diodes; If three inductance are respectively 1# inductance L 1, 2# inductance L 2with 3# inductance L 3; Four diodes are respectively 1# diode D 1, 2# diode D 2, 3# diode D 3with 4# diode D 4; An electric capacity is 1# capacitor C;
Described 1# diode D 1anode be connected with the positive pole of DC power supply Vdc, D 1negative electrode respectively with 1# inductance L 1one end, 2# inductance L 2one end and 2# diode D 2anode be connected; 1# inductance L 1the other end be connected with the positive pole of capacitor C, the negative pole of capacitor C is connected with the negative pole of DC power supply Vdc and the lower brachium pontis of inverter bridge; 2# inductance L 2the other end and 3# diode D 3with 4# diode D 4anode be connected; 3# inductance L 3one end and 2# diode D 2negative electrode and 3# diode D 3negative electrode be connected, 3# inductance L 3the other end and 4# diode D 4negative electrode and the upper brachium pontis of inverter bridge be connected.
Described L 1=L 2=L 3=L, L is the inductance value of inductance element in the Γ type Z source network that contains switched inductors unit.
The present invention has following advantage and technique effect:
1. by containing two electric capacity in traditional Z source network, be kept to and only contain an electric capacity, and capacitance voltage stress is certain value in the process of boosting, can extend useful life, the reduction system volume of system and reduce system cost.
2. under identical voltage gain, capacitance voltage stress is certain value, compares and has reduced capacitance voltage stress with other type Z-source inverter.
3. due to the front end of switched inductors unit in inverter bridge, so the impulse current to inverter bridge when this inverter can avoid system to start.
4. under the condition of identical voltage gain, the gain of the inductive current of switched inductors Γ type Z-source inverter is less than traditional Z source inventer and switched inductors Z-source inverter.
Accompanying drawing explanation:
Fig. 1 is inductive type Z-source inverter topological structure of the present invention;
Fig. 2 is traditional Z source inventer;
Fig. 3 Z-source inverter that is as the criterion;
Fig. 4 is switched inductors Z-source inverter;
Fig. 5 is the accurate Z-source inverter of switched inductors;
Fig. 6 be the present invention when pass-through state, switched inductors Γ type Z-source inverter topological structure;
Fig. 7 be the present invention when non-pass-through state, switched inductors Γ type Z inverter topology;
Fig. 8 is traditional Z source inventer, switched inductors Z-source inverter and switched inductors Γ type Z-source inverter voltage gain correlation curve;
Fig. 9 is traditional Z source inventer, switched inductors Z-source inverter and switched inductors Γ type Z-source inverter capacitance voltage stress correlation curve;
Figure 10 is traditional Z source inventer and switched inductors Γ type Z-source inverter inductive current stress correlation curve;
Figure 11 is switched inductors Z-source inverter and switched inductors Γ type Z-source inverter inductive current stress correlation curve.
Embodiment
By reference to the accompanying drawings inductive type Z-source inverter topological structure of the present invention is illustrated.
In the switched inductors Γ type Z source network of inverter of the present invention, only contain a capacity cell; In the process of boosting, capacitance voltage stress is certain value; Inductive current stress under identical voltage gain condition is less.
As shown in Figure 1: a kind of switched inductors Γ type Z-source inverter topological structure, this topological structure includes DC power supply, inverter bridge.Between described DC power supply and inverter bridge, add a Γ type Z source network that contains switched inductors unit, the front end in inverter bridge connects the Γ type Z source network that contains switched inductors unit.The described Γ type Z source network that contains switched inductors unit comprises three inductance, an electric capacity and four diodes; Wherein, three inductance are respectively 1# inductance L 1, 2# inductance L 2with 3# inductance L 3; Four diodes are respectively 1# diode D 1, 2# diode D 2, 3# diode D 3with 4# diode D 4; An electric capacity is 1# capacitor C;
Described 1# diode D 1anode be connected with the positive pole of DC power supply Vdc, D 1negative electrode respectively with 1# inductance L 1one end, 2# inductance L 2one end and 2# diode D 2anode be connected; 1# inductance L 1the other end be connected with the positive pole of capacitor C, the negative pole of capacitor C is connected with the negative pole of DC power supply Vdc and the lower brachium pontis of inverter bridge; 2# inductance L 2the other end and 3# diode D 3with 4# diode D 4anode be connected; 3# inductance L 3one end and 2# diode D 2negative electrode and 3# diode D 3negative electrode be connected, 3# inductance L 3the other end and 4# diode D 4negative electrode and the upper brachium pontis of inverter bridge be connected.
Described L 1=L 2=L 3=L, L is the inductance value of inductance element in the Γ type Z source network that contains switched inductors unit.
As shown in Figure 6: when working in pass-through state, 1#, 2# and 4# diode D in Γ type Z source network 1, D 2and D 4conducting, 3# diode D 3cut-off, wherein 2# and 3# inductance L 2and L 3be and be connected in parallel, now inductance stored energy;
As shown in Figure 7: when working in non-pass-through state, 1#, 2# and 4# diode D in Γ type Z source network 1, D 2and D 4cut-off, 3# diode D 3conducting, wherein 2# and 3# inductance L 2and L 3be and be connected in series, now inductance releases energy to load, and the voltage gain of this Z-source inverter is:
B = 2 + D 1 - D
Wherein: B is voltage gain; D is straight-through duty ratio.
In this Z-source inverter, average inductor current is:
I L = L l D + L ( 2 + D ) LR l V dc
Wherein: L is the inductance value of inductance element in Z source network; L lfor load inductance; R lfor load resistance; V dcfor DC power supply voltage.
Load average electric current is:
I l = ( 2 + D ) V dc R l
When load is pure when resistive, inductive current stress is:
I L = 2 + D 1 - D V dc R l
The voltage gain correlation curve of switched inductors Γ type Z-source inverter, traditional Z source inventer and switched inductors Z-source inverter as shown in Figure 8, known in figure, when little straight-through duty ratio, the voltage gain of switched inductors Γ type Z-source inverter is larger.
The capacitance voltage stress correlation curve of switched inductors Γ type Z-source inverter, traditional Z source inventer and switched inductors Z-source inverter as shown in Figure 9.Visible, the capacitance voltage stress of switched inductors Γ type Z-source inverter does not change with the variation of straight-through duty ratio, and the capacitance voltage stress range of other two kinds of Z-source inverters is larger.Wherein: SL-ZSI is switched inductors type Z-source inverter; Trad.ZSI is traditional Z source inventer.
Inductive current stress correlation curve in switched inductors Γ type Z-source inverter as shown in figure 10 and traditional Z source inventer, inductive current stress correlation curve in the switched inductors Γ type Z-source inverter shown in Figure 11 and switched inductors Z-source inverter and traditional Z source inventer.
From Fig. 8,10 and 11, can find out, in switched inductors Γ type Z-source inverter, inductive current STRESS VARIATION is less, and under identical voltage gain condition, its inductive current stress is less than the inductive current stress in traditional Z source inventer and switched inductors Z-source inverter.

Claims (3)

1. a switched inductors Γ type Z-source inverter topological structure, this topological structure includes DC power supply, inverter bridge, it is characterized in that: between described DC power supply and inverter bridge, add a Γ type Z source network that contains switched inductors unit, the front end in inverter bridge connects the Γ type Z source network that contains switched inductors unit.
2. switched inductors Γ type Z-source inverter topological structure according to claim 1, is characterized in that: described in contain switched inductors unit Γ type Z source network comprise three inductance, an electric capacity and four diodes; If three inductance are respectively 1# inductance L 1, 2# inductance L 2with 3# inductance L 3; Four diodes are respectively 1# diode D 1, 2# diode D 2, 3# diode D 3with 4# diode D 4; An electric capacity is 1# capacitor C;
Described 1# diode D 1anode be connected with the positive pole of DC power supply Vdc, D 1negative electrode respectively with 1# inductance L 1one end, 2# inductance L 2one end and 2# diode D 2anode be connected; 1# inductance L 1the other end be connected with the positive pole of capacitor C, the negative pole of capacitor C is connected with the negative pole of DC power supply Vdc and the lower brachium pontis of inverter bridge; 2# inductance L 2the other end and 3# diode D 3with 4# diode D 4anode be connected; 3# inductance L 3one end and 2# diode D 2negative electrode and 3# diode D 3negative electrode be connected, 3# inductance L 3the other end and 4# diode D 4negative electrode and the upper brachium pontis of inverter bridge be connected.
3. switched inductors Γ type Z-source inverter topological structure according to claim 2, is characterized in that: described L 1=L 2=L 3=L, L is the inductance value of inductance element in the Γ type Z source network that contains switched inductors unit.
CN201310437204.7A 2013-09-23 2013-09-23 Topological structure of switched inductor inverted L-shaped Z source inverter Pending CN103532413A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103997244A (en) * 2014-05-08 2014-08-20 南京铁道职业技术学院 Serial-connected Z-source tri-level inverter and method thereof
CN105186909A (en) * 2015-08-26 2015-12-23 齐鲁工业大学 Enhanced Z-source inverter and working method thereof
CN107612404A (en) * 2017-10-09 2018-01-19 哈尔滨工业大学 Γ source inventers and modulator approach based on switching capacity

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* Cited by examiner, † Cited by third party
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CN103326610A (en) * 2013-07-04 2013-09-25 天津城建大学 Topological structure for inductance-type Z-source inverter
CN203504449U (en) * 2013-08-31 2014-03-26 天津城市建设学院 Switch inductance gamma-type Z-source inverter topology structure
CN103840694A (en) * 2013-08-31 2014-06-04 天津城市建设学院 Topological structure of switch inductance inverted-L-shaped Z-source inverter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102223095A (en) * 2011-06-21 2011-10-19 哈尔滨工业大学(威海) High-gain Z-source inverter
CN103326610A (en) * 2013-07-04 2013-09-25 天津城建大学 Topological structure for inductance-type Z-source inverter
CN203504449U (en) * 2013-08-31 2014-03-26 天津城市建设学院 Switch inductance gamma-type Z-source inverter topology structure
CN103840694A (en) * 2013-08-31 2014-06-04 天津城市建设学院 Topological structure of switch inductance inverted-L-shaped Z-source inverter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103997244A (en) * 2014-05-08 2014-08-20 南京铁道职业技术学院 Serial-connected Z-source tri-level inverter and method thereof
CN105186909A (en) * 2015-08-26 2015-12-23 齐鲁工业大学 Enhanced Z-source inverter and working method thereof
CN107612404A (en) * 2017-10-09 2018-01-19 哈尔滨工业大学 Γ source inventers and modulator approach based on switching capacity
CN107612404B (en) * 2017-10-09 2019-07-02 哈尔滨工业大学 Γ source inventer and modulator approach based on switching capacity

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