CN105939126B - A kind of quasi- Z-source inverter of switched inductors type mixing - Google Patents

A kind of quasi- Z-source inverter of switched inductors type mixing Download PDF

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CN105939126B
CN105939126B CN201610508676.0A CN201610508676A CN105939126B CN 105939126 B CN105939126 B CN 105939126B CN 201610508676 A CN201610508676 A CN 201610508676A CN 105939126 B CN105939126 B CN 105939126B
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diode
inductance
capacitance
anode
cathode
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CN105939126A (en
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张波
朱小全
丘东元
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South China University of Technology SCUT
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/0067Converter structures employing plural converter units, other than for parallel operation of the units on a single load

Abstract

The present invention provides a kind of switched inductors types to mix quasi- Z-source inverter circuit, including voltage source, the switched inductors unit being made of the first inductance, the second inductance, the 4th diode, the 5th diode and the 6th diode, the boost switching unit being made of the first capacitance, the first diode, the second diode and metal-oxide-semiconductor S, the quasi- Z source units being made of third inductance, the second capacitance, third capacitance and third diode, three phase inverter bridge, output inductor, filter capacitor and load.The characteristic of entire circuit combines boost switching unit and the respective single-stage buck characteristic of quasi- Z source units and switched inductors charge parallel discharged in series, with higher output voltage gain, output and input are altogether, the voltage stress of switching device in inverter bridge is reduced, and there is no the dash currents that inrush current and switching tube open moment for circuit.

Description

A kind of quasi- Z-source inverter of switched inductors type mixing
Technical field
The present invention relates to power electronic circuit technical fields, and in particular to a kind of quasi- Z-source inverter of switched inductors type mixing Circuit.
Background technology
In fuel cell power generation, photovoltaic generation, due to single solar cell or single fuel cell provide it is straight Galvanic electricity pressure is relatively low, cannot be satisfied the power demand of existing electrical equipment, can not meet the needs of grid-connected, generally requiring will be multiple Battery is together in series the voltage for reaching required.On the one hand this method greatly reduces the reliability of whole system, on the other hand It also needs to solve the problems, such as series average-voltage.For this reason, it may be necessary to can be the high-gain converter circuit that low voltage transition is high voltage.It is close several The sources the Z booster converter that year proposes is a kind of high-gain converter circuit, but the circuit has higher impedance network capacitance electricity Compression, source current is discontinuous, exports and inputs not altogether, and there are problems that very big inrush current when circuit start, Limit the application of the circuit in practice.
Invention content
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, it is inverse to provide a kind of quasi- sources Z of switched inductors type mixing Become device circuit, specific technical solution is as follows.
A kind of quasi- Z-source inverter circuit of switched inductors type mixing, including voltage source, switched inductors unit, boost switching list First, quasi- Z source units, three phase inverter bridge, output inductor, filter capacitor and exchange side threephase load.The switched inductors list Member is made of the first inductance, the second inductance, the 4th diode, the 5th diode and the 6th diode;The boost switching unit It is made of the first capacitance, the first diode, metal-oxide-semiconductor S and the second diode;The quasi- Z source units are by third inductance, the second electricity Hold, third capacitance and third diode are constituted.
A kind of above-mentioned switched inductors type mixes in quasi- Z-source inverter circuit, anode and the first inductance of the voltage source One end is connected with the anode of the 4th diode;The cathode of 4th diode is electric with the cathode of the 5th diode and second respectively One end of sense connects;The other end of first inductance connects with the anode of the anode of the 5th diode and the 6th diode respectively It connects;The cathode drain electrode with the other end of the second inductance, the anode of the first diode and metal-oxide-semiconductor S respectively of 6th diode Connection;The source electrode of the metal-oxide-semiconductor S is connect with the cathode of the anode of the second diode and the first capacitance respectively;One or two pole The cathode of pipe is connect with the anode of the anode of the first capacitance, the cathode of third capacitance and third diode respectively;Described 3rd 2 The cathode of pole pipe is connect with one end of the anode of the second capacitance and third inductance respectively;The anode of the third capacitance is respectively with the The other end of three inductance is connected with the positive ends of three phase inverter bridge;The cathode of voltage source the moon with the second diode respectively Pole, the cathode of the second capacitance are connected with the negative polarity end of three phase inverter bridge.
Compared with prior art, circuit of the present invention has the following advantages that and technique effect:Circuit output voltage of the present invention increases Beneficial higher reduces the voltage stress of switching device in inverter bridge;There is good inhibiting effect to inrush current, reliably Property improve;And output with input altogether, thus the generations of electricity by new energy skill such as be more suitably applied to fuel cell power generation and photovoltaic generation Art field.
Description of the drawings
Fig. 1 is that a kind of switched inductors type in the specific embodiment of the invention mixes quasi- Z-source inverter circuit.
Fig. 2 is the simple equivalent circuit that a kind of switched inductors type shown in Fig. 1 mixes that quasi- Z-source inverter carries out model analysis.
Fig. 3 a, Fig. 3 b are that the quasi- Z-source inverter of a kind of switched inductors type mixing shown in Fig. 1 is straight-through in its three phase inverter bridge respectively When and it is non-straight-through when equivalent circuit diagram.
Fig. 4 a are that the sensitizing factor curve of circuit of the present invention is expanded with switched inductors Z-source inverter, based on diode two level Quasi- Z-source inverter and the sensitizing factor curve of traditional Z-source inverter compare figure.
Fig. 4 b are the graph of relation of the index of modulation M and exchange side output voltage gain G of four kinds of inverters.
Fig. 4 c are the comparison figure of switching device voltage stress in four kinds of inverters.
Fig. 4 d are with ViIt is related to exchange side that circuit direct side of the present invention is given for=20V, straight-through duty ratio D=0.2 The simulation result diagram of variable.
Specific implementation mode
The above content is explained in detail technical scheme of the present invention, below in conjunction with attached drawing to the specific of the present invention Implementation is further described.
With reference to figure 1, a kind of quasi- Z-source inverter circuit of switched inductors type mixing of the present invention comprising voltage source Vi、 Switched inductors unit, boost switching unit, quasi- Z source networks, three phase inverter bridge, output inductor, filter capacitor and three are opposite Claim load.The switched inductors unit is by the first inductance L1, the second inductance L2, the 4th diode D4, the 5th diode D5With the 6th Diode D6It constitutes;The boost switching unit is by the first capacitance C1, the first diode D1, metal-oxide-semiconductor S and the second diode D2Structure At;The quasi- Z source networks are by third inductance L3, the second capacitance C2, third capacitance C3With third diode D3It constitutes.Work as inverter bridge It is straight-through (to be equivalent to S1It is closed) while when metal-oxide-semiconductor S conducting, the first diode D1, the second diode D2, third diode D3 With the 5th diode D5It is turned off, the 4th diode D4With the 6th diode D6Conducting, three phase inverter bridge exchange side load short circuits. Second capacitance C2To third inductance L3Charging;The voltage source ViWith the first capacitance C1With third capacitance C3Together in parallel first Inductance L1With the second inductance L2Charging energy-storing.Straight-through (it is equivalent to S when inverter bridge is non-1Shutdown) while when metal-oxide-semiconductor S shutdown, inverter bridge It exchanges lateral load and accesses main circuit.The first diode D1, the second diode D2, third diode D3With the 5th diode D5 It is both turned on, the 4th diode D4With the 6th diode D6Shutdown.The voltage source ViWith the first inductance L1With the second inductance L2Together To the first capacitance C in parallel1With the second capacitance C2Charging energy-storing, forming circuit;Third inductance L3With third capacitance C3Parallel connection, shape At circuit;Meanwhile voltage source ViWith the first inductance L1, the second inductance L2With third inductance L3Together by three phase inverter bridge to friendship Flow lateral load power supply.Entire circuit structure is simple, has higher output voltage gain, exports with input altogether, and circuit is not There are the current impacts that moment is opened in starting current impact and switching tube.
The specific connection of circuit of the present invention is as follows:The one end and the 4th diode of the anode of the voltage source with the first inductance Anode connection;The cathode of 4th diode is connect with one end of the cathode of the 5th diode and the second inductance respectively;Institute The other end for stating the first inductance is connect with the anode of the anode of the 5th diode and the 6th diode respectively;6th diode Cathode connect respectively with the drain electrode of the other end of the second inductance, the anode of the first diode and metal-oxide-semiconductor S;The metal-oxide-semiconductor S's Source electrode is connect with the cathode of the anode of the second diode and the first capacitance respectively;The cathode of first diode is respectively with first The anode of capacitance, the cathode of third capacitance are connected with the anode of third diode;The cathode of the third diode is respectively with The anode of two capacitances is connected with one end of third inductance;The third capacitance anode respectively with the other end of third inductance and The positive ends of three phase inverter bridge connect;The cathode of the voltage source respectively with the cathode of the second diode, the second capacitance it is negative Pole is connected with the negative polarity end of three phase inverter bridge.
Fig. 3 a, Fig. 3 b give the process chart of circuit of the present invention.Fig. 3 a, Fig. 3 b are that inverter bridge is straight-through and non-straight respectively The equivalent circuit diagram of logical period.Solid line indicates there is the part that electric current flows through in converter in figure, and dotted line indicates in converter without electricity The part that stream flows through.
The course of work of the present invention is as follows:
Stage 1, such as Fig. 3 a:Inverter bridge is straight-through (to be equivalent to S1It is closed) while when metal-oxide-semiconductor S conducting, first diode D1, the second diode D2, third diode D3With the 5th diode D5It is turned off, the 4th diode D4With the 6th diode D6It leads It is logical, three phase inverter bridge exchange side load short circuits.Circuit forms two circuits, is respectively:Second capacitance C2To third inductance L3It fills Electricity, forming circuit;Voltage source ViWith the first capacitance C1With third capacitance C3Together to the first inductance L in parallel1With the second inductance L2 Charging energy-storing, forming circuit.
Stage 2, such as Fig. 3 b:Non- lead directly to of inverter bridge (is equivalent to S1Shutdown) while when metal-oxide-semiconductor S shutdown, inverter bridge exchange side Load access main circuit.The first diode D1, the second diode D2, third diode D3With the 5th diode D5It is both turned on, 4th diode D4With the 6th diode D6Shutdown.Circuit forms four circuits, is respectively:The voltage source ViWith the first inductance L1With the second inductance L2Together to the first capacitance C in parallel1With the second capacitance C2Charging energy-storing, forming circuit;Third inductance L3With Third capacitance C3Parallel connection, forming circuit;Meanwhile voltage source ViWith the first inductance L1, the second inductance L2With third inductance L3Lead to together It crosses three phase inverter bridge and gives exchange side load supplying.
To sum up situation, when inverter bridge is led directly to, metal-oxide-semiconductor S is connected, and when inverter bridge is non-straight-through, metal-oxide-semiconductor S is turned off.Therefore it sets The straight-through duty ratio of inverter bridge is D, then the conducting dutycycle of metal-oxide-semiconductor S is similarly D, and the configuration switch period is Ts.And set VL1With VL2And VL3Respectively the first inductance L1, the second inductance L2With third inductance L3The voltage at both ends, VC1、VC2And VC3Respectively first Capacitance C1, the second capacitance C2With third capacitance C3Voltage, VSFor the voltage between metal-oxide-semiconductor S drain electrodes and source electrode, VPNFor inverter bridge Direct current side chain voltage.After inverter enters steady operation, voltage relationship derivation below is obtained.
Stage 1:Inverter bridge is straight-through (to be equivalent to S1Be closed) at the same metal-oxide-semiconductor be connected during, corresponding equivalent circuit diagram 3a institutes Show, therefore has following formula:
VL1_on=VL2_on=Vi+VC1+VC3 (1)
VL3_on=VC2 (2)
VS=VPN=0 (3)
The straight-through time of inverter bridge and the turn-on time of metal-oxide-semiconductor S are DTs
Stage 2:Non- lead directly to of inverter bridge (is equivalent to S1Shutdown) at the same metal-oxide-semiconductor S shutdown during, corresponding equivalent circuit is as schemed Shown in 3b, therefore there is following formula:
VL1_off+VL2_off=Vi-VC1 (4)
VL3_off=-VC3 (5)
VC1=VC2 (6)
VS=VC1 (7)
VPN=VC1+VC3 (8)
Inverter bridge non-straight-through time and the turn-off time of metal-oxide-semiconductor S are (1-D) Ts
According to the above analysis, to the first inductance L1, the second inductance L2With third inductance L3Inductance Flux consumption conservation is used respectively Principle, simultaneous formula (1), formula (2), formula (4) and formula (5) can obtain:
Vi+(2D-1)VC1+DVC3=(1-D) VL2_off (9)
Vi+(2D-1)VC1+DVC3=(1-D) VL1_off (10)
DVC2=(1-D) VC3 (11)
Thus, simultaneous formula (6), formula (7), formula (8), formula (9), formula (10) and formula (11) can obtain the first capacitance C1Voltage VC1With the second capacitance C2Voltage VC2Voltage source ViBetween relational expression be:
Third capacitance C3Voltage VC3With supply voltage ViRelational expression be:
Voltage between the hourglass source electrode at the both ends metal-oxide-semiconductor S is:
Inversion bridge DC side chain voltage VPNFor:
Then sensitizing factor (Boost Factor) B of inverter circuit of the present invention is:
Corresponding exchange side output voltage gain G is:
G=MB=(0~∞) (17)
The sensitizing factor curve and switched inductors Z-source inverter of circuit of the present invention as shown in Figure 4 a are based on diode two The sensitizing factor curve of quasi- Z-source inverter and traditional Z-source inverter that grade is expanded compares figure;Figure includes circuit of the present invention Sensitizing factor curve, the sensitizing factor curve of switched inductors Z-source inverter, the quasi- Z-source inverter expanded based on diode two level Sensitizing factor curve, and traditional Z-source inverter sensitizing factor curve.As seen from the figure, circuit of the present invention does not surpass in duty ratio D In the case of crossing 0.26, sensitizing factor B can reach very big, hence it is evident that it is higher than the sensitizing factor of other inverter topologies, And the duty ratio D of circuit of the present invention does not exceed 0.26.
Fig. 4 b are the graph of relation of the index of modulation M and exchange side output voltage gain G of four kinds of inverters, as seen from the figure In the case of exchange side output voltage gain G having the same, circuit of the present invention can be used than other three kinds of inverter circuits Index of modulation M to bigger is modulated inverter, and then improves the DC voltage utilization rate of inverter, improves exchange The quality of side output voltage waveforms.
Fig. 4 c are the comparison of switching device voltage stress in four kinds of inverters, are opened in circuit inverter bridge of the present invention as seen from the figure The voltage stress for closing device will be small than other three kinds of inverter topologies, and then reduces the cost using switching device With.
Fig. 4 d are with ViIt is related to exchange side that circuit direct side of the present invention is given for=20V, straight-through duty ratio D=0.2 The simulation result of variable.When D=0.2, sensitizing factor B=5, inverter bridge DC-link voltage VPN=B*Vi=100V, capacitance voltage VC1=VC3=80V, VC2The voltage VS=80V at the both ends=20V, switch S.In addition, giving inductive current i in Fig. 4 dL1,iL2 And iL3Waveform, exchange side exports phase voltage VphaseWith output line voltage VlineWaveform and three-phase symmetrical ohmic load two Terminal voltage VRLWaveform.
In conclusion there is circuit of the present invention higher output voltage gain, output altogether, to reduce inverter bridge with input The voltage stress of middle switching device, and there is no the dash currents that inrush current and switching tube open moment for circuit.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications, Equivalent substitute mode is should be, is included within the scope of the present invention.

Claims (1)

1. a kind of switched inductors type mixes quasi- Z-source inverter circuit, it is characterised in that including voltage source(Vi), switched inductors unit, Boost switching unit, quasi- Z source units, three phase inverter bridge, output inductor, filter capacitor and three phase symmetry load;It is described to open Inductance unit is closed by the first inductance(L1), the second inductance(L2), the 4th diode(D4), the 5th diode(D5)With the six or two pole Pipe(D6)It constitutes;The boost switching unit is by the first capacitance(C1), the first diode(D1), metal-oxide-semiconductor(S)With the second diode (D2)It constitutes;The quasi- Z source units are by third inductance(L3), the second capacitance(C2), third capacitance(C3)With third diode(D3) It constitutes;The voltage source(Vi)Anode with the first inductance(L1)One end and the 4th diode(D4)Anode connection;Described Four diodes(D4)Cathode respectively with the 5th diode(D5)Cathode and the second inductance(L2)One end connection;Described first Inductance(L1)The other end respectively with the 5th diode(D5)Anode and the 6th diode(D6)Anode connection;Described 6th Diode(D6)Cathode respectively with the second inductance(L2)The other end, the first diode(D1)Anode and metal-oxide-semiconductor(S)Leakage Pole connects;The metal-oxide-semiconductor(S)Source electrode respectively with the second diode(D2)Anode and the first capacitance(C1)Cathode connection;Institute State the first diode(D1)Cathode respectively with the first capacitance(C1)Anode, third capacitance(C3)Cathode and third diode (D3)Anode connection;The third diode(D3)Cathode respectively with the second capacitance(C2)Anode and third inductance(L3) One end connection;The third capacitance(C3)Anode respectively with third inductance(L3)The other end and three phase inverter bridge anode Property end connection;The voltage source(Vi)Cathode respectively with the second diode(D2)Cathode, second capacitance(C2)Cathode and The negative polarity end of three phase inverter bridge connects;When the bridge arm direct pass exchange side load short circuits while metal-oxide-semiconductor of three phase inverter bridge(S)Conducting When, first diode(D1), the second diode(D2), third diode(D3)With the 5th diode(D5)It is turned off, the 4th Diode(D4)With the 6th diode(D6)Conducting, the second capacitance(C2)To third inductance(L3)Charging;The voltage source(Vi)With First capacitance(C1)With third capacitance(C3)Together to the first inductance in parallel(L1)With the second inductance(L2)Charging energy-storing;When three The bridge arm of phase inverter bridge is non-straight to be connected into exchange lateral load while metal-oxide-semiconductor(S)When shutdown, first diode(D1), second Diode(D2), third diode(D3)With the 5th diode(D5)It is both turned on, the 4th diode(D4)With the 6th diode(D6) Shutdown, the voltage source(Vi)With the first inductance(L1)With the second inductance(L2)Together to the first capacitance in parallel(C1)With second Capacitance(C2)Charging energy-storing, forming circuit;Third inductance(L3)With third capacitance(C3)Parallel connection, forming circuit;Meanwhile voltage source (Vi)With the first inductance(L1), the second inductance(L2)With third inductance(L3)It is supplied together to exchange lateral load by three phase inverter bridge Electricity.
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CN107134942A (en) * 2017-06-16 2017-09-05 华南理工大学 A kind of quasi- Z-source inverter of active switch capacitor
CN107565814A (en) * 2017-09-30 2018-01-09 华南理工大学 A kind of quasi- Z source switch boosting inverters of high-gain suitable for fuel cell power generation
CN111865129B (en) * 2020-07-09 2021-10-26 南京航空航天大学 Four-switch single-phase single-stage type switch boosting inverter
CN112054707A (en) * 2020-08-12 2020-12-08 中国科学院电工研究所 Micro inverter applied to high-voltage thin-film photovoltaic module based on switch inductor
KR20220090472A (en) * 2020-12-22 2022-06-29 한국과학기술원 Load driving apparatus
CN115800734B (en) * 2023-02-08 2023-05-02 浙江日风电气股份有限公司 Single-stage second-order boost inverter, boost method, boost device, single-stage second-order boost inverter equipment and medium

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