CN103701342B - A kind of accurate Z-source inverter - Google Patents
A kind of accurate Z-source inverter Download PDFInfo
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- CN103701342B CN103701342B CN201310699489.1A CN201310699489A CN103701342B CN 103701342 B CN103701342 B CN 103701342B CN 201310699489 A CN201310699489 A CN 201310699489A CN 103701342 B CN103701342 B CN 103701342B
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Abstract
The invention discloses a kind of accurate z source inventer, comprise the boost network connected successively, accurate z source circuit, full-bridge inverter; Boost network comprises the first diode, the 3rd inductance, the second diode and the 3rd electric capacity, and accurate z source circuit comprises the first inductance, the second inductance, the first electric capacity, the second electric capacity and the 3rd diode.First diode is serially connected with between the second inductance and the 3rd inductance, second diodes in parallel is in the first diode and the 3rd inductance two ends, 3rd Capacitance parallel connection is in the second inductance and the first diode two ends, 3rd diode is connected between the first inductance and the second inductance, first Capacitance parallel connection is at the first inductance and the 3rd diode two ends, second electric capacity is connected between the negative pole of DC source and the first inductance, direct voltage source positive pole is connected with inverter, and the present invention has the advantages such as boosting is high, stable, volume is little, efficiency is high, capacitance voltage stress is low.
Description
Technical field
The invention belongs to inversion field, relate to a kind of accurate z source inventer.
Background technology
Along with the deterioration increasingly of the day by day serious of energy crisis and ball ecological environment; the whole world all strive to find a kind of can sustainable utilization the novel energy that our biological environment is not polluted; the new forms of energy such as photovoltaic solar now become the scientific and technological commanding elevation that various countries competitively fight for, and the core technology of inversion transformation technique whole system just.Along with the fast development of DSP technology and high-power, high-frequency switching device and cost constantly reduce, promote high-power, low cost, efficiently inverter and constantly advance, be applied to industry, military project, the every aspect such as civilian.Thus development of new, high energy efficiency ratio, safe, stable inverter have a very important role, and actively can promote greatly developing of the new forms of energy such as parallel network power generation, promote that China has larger advantage on energy strategy.
Research at present for inverter mainly concentrates on how to improve its topological structure and control strategy aspect, and in order to increase the reliability of its work, mostly be increase buffer circuit in inverter, but this not only adds the loss of whole system, also reduce the efficiency of inverter simultaneously.In addition, conventional inverter single-stage cannot realize buck and the inversion of DC power supply, need increase preceding stage DC-DC link, thus makes the control of system become complicated, and inefficiency, does not also possess advantage in the use of device.Therefore, research high reliability, high efficiency, the simple novel inverter of structure have very real meaning, are also one of important directions of current inversion transformation technique development.
Summary of the invention
Technical problem: the invention provides a kind of can be implemented in less straight-through duty ratio situation under realize any multiple boosting or greatly increase in identical straight-through duty ratio situation its boosting multiple, single step arrangement achieves buck and inversion, there is very high buck ability, reliability and efficiency, greatly reduce the accurate z source inventer of capacitance voltage stress simultaneously.
Technical scheme: accurate z source inventer of the present invention, comprises the boost network connected successively, accurate z source circuit, full-bridge inverter.Boost network comprises the first diode, the 3rd inductance, the second diode and the 3rd electric capacity, one end of 3rd electric capacity is connected with the negative electrode of the first diode and one end of the 3rd inductance simultaneously, the anode of the first diode is connected with the anode of the second diode, and the other end of the 3rd inductance is connected with the negative electrode of the second diode.
Accurate z source circuit comprises the first inductance, the second inductance, the first electric capacity, the second electric capacity and the 3rd diode, one end of first inductance is connected with the anode of the 3rd diode, the other end is connected with one end of the first electric capacity, the other end of the first electric capacity is connected with the negative electrode of the 3rd diode, the negative electrode of the 3rd diode is also connected with one end of the second inductance and one end of the second electric capacity simultaneously, and the other end of the 3rd electric capacity connects in boost network, the other end of the second inductance is connected with the anode of the first diode in boost network.
The other end that in accurate z source circuit, the first inductance is connected with the first electric capacity, is also connected with the negative electrode of full-bridge inverter simultaneously.
In a kind of embodiment of invention, when disconnecting gate-controlled switch, the 3rd diode and the first diode are in off state, and the second diode is in conducting state, and now accurate z source inventer is in pass-through state.
In the another kind of embodiment of invention, when conducting gate-controlled switch, the second diode is in conducting state, and the 3rd diode and the first diode are in off state, and now accurate z source inventer is in non-pass-through state.
Beneficial effect: compared with prior art, tool has the following advantages in the present invention:
The present invention single-stage can realize the buck of the arbitrary proportion of DC voltage, do not need to add DC-DC step-up/step-down circuit in prime, there is very high reliability and efficiency, compare with general impedance network-type inverter, there is higher buck multiple, can effectively reduce capacitance voltage stress, can soft-start feature be realized.
In Fig. 4, the boost capability of curve 1 is apparently higher than other two kinds topological boost capability.As can be seen from Fig. 5, Fig. 6, when direct-current chain crest voltage is 155V, VC2 in the accurate Z-source inverter of the present invention is higher than the accurate Z-source inverter of extended pattern, and VC1 and VC3 is all less than the accurate Z-source inverter of extended pattern, and VC2 and the VC1 that in the middle of two kinds of topologys, capacitance voltage stress is maximum is substantially identical.Therefore can prove, the accurate Z-source inverter of the present invention can reduce capacitance voltage stress effectively.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of accurate z source inventer of the present invention;
Fig. 2 is the equivalent circuit diagram of accurate z source inventer of the present invention under pass-through state;
Fig. 3 is the equivalent circuit diagram of accurate z source inventer of the present invention under non-pass-through state;
Fig. 4 is the boost capability Matlab/Simulink analogous diagram of 3 kinds of topological structures;
Fig. 5 is the capacitance voltage stress Matlab/Simulink analogous diagram of the accurate Z-source inverter of extended pattern;
Fig. 6 is the present invention's accurate Z-source inverter capacitance voltage stress Matlab/Simulink analogous diagram.
Have in figure: boost network B, accurate z source circuit Q, full-bridge inverter C, DC power supply S, the first inductance L 1, second inductance L 2, the 3rd inductance L 3, first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the first diode D1, the second diode C2, the 3rd diode D3, the first controllable switch S 1, second controllable switch S 2, the 3rd controllable switch S 3, the 4th controllable switch S 4, the 5th controllable switch S 5, the 6th controllable switch S 6.
Embodiment
Describe the beneficial effect of implementation process of the present invention and generation below by way of specific embodiment in detail, be intended to help reader to understand essence of the present invention and feature in the better end, not as can the restriction of practical range to this case.
It is AC power that the present invention is used for DC power supply inversion, DC source connected mode is as follows: DC power anode is connected with the positive pole of full-bridge inverter C, DC power cathode is connected with the second diode cathode in career network B, and DC power supply can be photovoltaic too can battery pack and conventional DC source.
Refer to Fig. 1, accurate z source inventer device of the present invention comprises: boost network B, accurate z source circuit Q, full-bridge inverter C, and full-bridge inverter comprises gate-controlled switch, and wherein accurate z source circuit Q is traditional accurate z source circuit.Boost network B comprises the first diode D1, the 3rd inductance L 3, second diode D2 and the 3rd electric capacity C3, one end of 3rd electric capacity C3 is connected with the negative electrode of the first diode D1 and one end of the 3rd inductance L 3 simultaneously, the anode of the first diode D1 is connected with the anode of the second diode D2, and the other end of the 3rd inductance L 3 is connected with the negative electrode of the second diode D2.
Accurate z source circuit Q comprises the first inductance L 1, second inductance L 2, first electric capacity C1, second electric capacity C2 and the 3rd diode D3, one end of first inductance L 1 is connected with the anode of the 3rd diode D3, the other end is connected with one end of the first electric capacity C1, the other end of the first electric capacity C1 is connected with the negative electrode of the 3rd diode D3, the negative electrode of the 3rd diode D3 is also connected with one end of the second inductance L 2 and one end of the second electric capacity C2 simultaneously, and the other end of the 3rd electric capacity C3 connects in boost network, the other end of the second inductance L 2 is connected with the anode of the first diode D1 in boost network B, also be connected with the anode of the second diode D2 in boost network B simultaneously, the other end of the second electric capacity C2 is connected with the negative electrode of the second diode D2 in boost network B, namely one end that in boost network B, the second diode D2 is connected with the 3rd inductance L 3, the other end that in accurate z source circuit Q, the first inductance L 1 is connected with the first electric capacity C1, is also connected with the negative electrode of full-bridge inverter C simultaneously, and full-bridge inverter comprises gate-controlled switch device.
Wherein the inductance value of 3 inductance L 1, L2, L3 is equal, and the capacitance of 3 electric capacity C1, C2, C3 is equal, and namely impedance network has symmetry.
Refer to Fig. 2, when upper and lower bridge arm gate-controlled switch first controllable switch S 1, second controllable switch S 2 or, the 3rd controllable switch S 3, the 4th controllable switch S 4 or, the 5th controllable switch S 5, the simultaneously conducting of the 6th controllable switch S 6 time, diode D1 and diode D3 is in off state, diode D2 is in conducting state, and now accurate z source inventer is in pass-through state.
Inverter works in pass-through state, and now inverter short circuit is equivalent to a wire, and diode D2 is in conducting state, and diode D1 and diode D3 is in blocking state.Suppose that inverter switch device switch periods is T, the pass-through state time is Ta, and Ta/T=D, D are the percentage that the straight-through time accounts for whole switch periods, are straight-through duty ratio.According to equivalent circuit diagram, can show that circuit equation is now as follows by symmetry:
V
dc+V
C2＝V
L1
V
dc+V
C1＝V
L2
V
dc+V
C1+V
C3＝V
L3(1)
Illustrate: V represents each components and parts voltage, V
l1represent inductance L 1 both end voltage, V
l2represent inductance L 2 both end voltage, V
l3represent inductance L 3 both end voltage, V
c1represent electric capacity C1 both end voltage, V
c2represent electric capacity C2 both end voltage, V
c3represent electric capacity C3 both end voltage, V
dcrepresent direct voltage source both end voltage.
Refer to Fig. 3, when inverter normally works, diode D1 and diode D3 is in conducting state, and pole pipe D2 is in off-state, and now modified model accurate z source inventer is in non-pass-through state.
Inverter works in non-pass-through state, and now inverter is equivalent to voltage source V
pN, diode D1 and diode D3 is in conducting state, and diode D2 is in off-state, and now accurate z source inventer is in non-pass-through state.According to equivalent circuit diagram, following circuit equation can be obtained by symmetry:
V
L1＝-V
C1
V
L2＝-V
C3
V
C2-V
C3＝V
L3
V
dc+V
C1+V
C2＝V
PN(2)
Illustrate: V represents each components and parts voltage, V
l1represent inductance L 1 both end voltage, V
l2represent inductance L 2 both end voltage, V
l3represent inductance L 3 both end voltage, V
c1represent electric capacity C1 both end voltage, V
c2represent electric capacity C2 both end voltage, V
c3represent electric capacity C3 both end voltage, V
dcrepresent direct voltage source both end voltage, V
pNrepresent the voltage source voltage corresponding to inverter.
According to formula (1) (2) and by the voltage-second balance principle of inductance in a switch periods, namely the integration of voltage in a switch periods at inductance two ends is the characteristic of zero, can release as shown in the formula:
DT(V
dc+V
C2)＝(1-D)TV
C1
DT(V
C1+V
dc)＝(1-D)TV
C3
DT(V
C1+V
C3+V
dc)＝(1-D)T(V
C2-V
C3)(3)
By formula (3) can release as shown in the formula:
As can be seen from formula (4), be added in the voltage V at inverter two ends
pNwith DC voltage V
dcinversely proportional relation, greatly achieve the boost capability of DC voltage, the adjustment space that modulation ratio is larger can be given, straight-through duty ratio can be controlled little by little to increase from zero simultaneously, voltage correspondingly on electric capacity is also started from scratch little by little to be increased, so the voltage when starting on electric capacity can not be uprushed, Soft Starting Performance can be realized.
These are only the schematic specific embodiment of the present invention, and be not used to limit usage range of the present invention.Any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present utility model and principle and amendment, all should belong to the scope of protection of the invention.
Claims (1)
1. an accurate z source inventer, is characterized in that, this inverter comprises the boost network (B), accurate z source circuit (Q), the full-bridge inverter (C) that connect successively;
Described boost network (B) comprises the first diode (D1), the 3rd inductance (L3), the second diode (D2) and the 3rd electric capacity (C3), one end of described 3rd electric capacity (C3) is connected with the negative electrode of the first diode (D1) and one end of the 3rd inductance (L3) simultaneously, the anode of described first diode (D1) is connected with the anode of the second diode (D2), and the other end of the 3rd inductance (L3) is connected with the negative electrode of the second diode (D2);
Described accurate z source circuit (Q) comprises the first inductance (L1), second inductance (L2), first electric capacity (C1), second electric capacity (C2) and the 3rd diode (D3), one end of described first inductance (L1) is connected with the anode of the 3rd diode (D3), the other end is connected with the one end of the first electric capacity (C1), the other end of the first electric capacity (C1) is connected with the negative electrode of the 3rd diode (D3), the negative electrode of described 3rd diode (D3) simultaneously also with one end of the second inductance (L2) and one end of the second electric capacity (C2), and the other end of the 3rd electric capacity (C3) connects in boost network (B), the other end of described second inductance (L2) is connected with the anode of the first diode (D1) in boost network (B), the other end of described second electric capacity (C2) is connected with the negative electrode of the second diode (D2) in boost network (B),
The other end that in described accurate z source circuit (Q), the first inductance (L1) is connected with the first electric capacity (C1), is also connected with the negative electrode of full-bridge inverter (C) simultaneously.
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| CN201310699489.1A CN103701342B (en) | 2013-12-18 | 2013-12-18 | A kind of accurate Z-source inverter |
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| CN201310699489.1A CN103701342B (en) | 2013-12-18 | 2013-12-18 | A kind of accurate Z-source inverter |
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| CN103701342B true CN103701342B (en) | 2016-04-06 |
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| CN104734547B (en) * | 2015-03-19 | 2017-08-04 | 南京航空航天大学 | A kind of boosting unit Z-source inverter |
| 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 |
| CN109842313A (en) * | 2019-03-07 | 2019-06-04 | 广东工业大学 | A kind of quasi- z source inventer of switching boost type |
| CN110212816A (en) * | 2019-06-13 | 2019-09-06 | 河北工业大学 | Double PWM driving control system for electric machine based on the two-way quasi- source Z |
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| JP2008160942A (en) * | 2006-12-21 | 2008-07-10 | Toshiba Corp | Semiconductor power conversion device |
| DE102010052808A1 (en) * | 2010-11-27 | 2012-05-31 | Daimler Ag | Method for operating vehicle e.g. hybrid vehicle, involves setting switch of one bridge branch of quasi-Z-source inverter such that outputs are shorted together in one time period and not short-circuited in another time period |
| CN102185533B (en) * | 2011-05-23 | 2013-05-15 | 北京交通大学 | Stored energy type standard-Z source photovoltaic power generation control system and method |
| CN103117650B (en) * | 2013-01-24 | 2015-01-28 | 东南大学 | Quasi Z source inverter |
| CN103078570A (en) * | 2013-02-04 | 2013-05-01 | 上海理工大学 | Torque pulsation restraining system and method of permanent magnet brushless direct current motor |
| CN103401465A (en) * | 2013-08-13 | 2013-11-20 | 青岛理工大学 | Wide range voltage adjustable buck-boost single-stage inverter circuit device |
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