CN107809182A - A kind of buck-boost grid-connected inverter - Google Patents

A kind of buck-boost grid-connected inverter Download PDF

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Publication number
CN107809182A
CN107809182A CN201711050561.2A CN201711050561A CN107809182A CN 107809182 A CN107809182 A CN 107809182A CN 201711050561 A CN201711050561 A CN 201711050561A CN 107809182 A CN107809182 A CN 107809182A
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China
Prior art keywords
switching tube
diode
node
buck
switch pipe
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CN201711050561.2A
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Chinese (zh)
Inventor
吴卫民
张帅
安丽琼
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Shanghai Maritime University
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Shanghai Maritime University
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Priority to CN201711050561.2A priority Critical patent/CN107809182A/en
Publication of CN107809182A publication Critical patent/CN107809182A/en
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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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators

Abstract

The present invention discloses a kind of buck-boost grid-connected inverter, comprising:Step-up/step-down circuit, detection circuit and control circuit;The step-up/step-down circuit comprises at least:First switch pipe, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube, the first inductance, the first diode, the second diode, the 3rd diode and filter capacitor;The detection circuit is used for the line voltage for detecting the DC voltage and power network AC power of direct voltage source, and feeds back to the control circuit;The control circuit is used to send controlled end of the switch controlling signal to the switching tubes of first switch Guan Zhi five according to the DC voltage and line voltage of detection, to control the step-up/step-down circuit to be operated in the mode of operation of decompression, boosting and buck.The present invention can use full FET as switching device, and only have a switching tube to be in high frequency state all the time, and switching loss is smaller, efficiency high, being capable of DC voltage wide variation.

Description

A kind of buck-boost grid-connected inverter
Technical field
The present invention relates to a kind of combining inverter for power system, and in particular to a kind of buck-boost grid-connected inverter.
Background technology
In traditional photovoltaic DC-to-AC converter topological structure, in order to ensure the quality of safety and output electric energy, generally require to adopt Isolated with isolating transformer, suppress output current harmonics.But traditional transformer is because volume is big, weight is big, efficiency is low etc. Shortcoming causes very big influence to the performance of whole photovoltaic generating system.
With the new distribution type energy rise and pour in, transless combining inverter is bright compared to conventional inverter Aobvious advantage has obtained global attention.In transless combining inverter, due to the missing of transformer, leakage often be present Current problems.And it is adapted to direct current input side wide variation than in relatively rugged environment, how to find in environmental change Inverter also turns into international research focus.
As shown in figure 1, be traditional H bridge structures, wherein E is direct voltage source, VgFor power network AC power.Traditional H bridges It is simple in construction, it can be very good to suppress Leakage Current problem using bipolar modulation.But it can so cause in whole power network week 4 switching tube S1~S4 are whole DC voltage with higher switching frequency operation, switching voltage in phase, can be caused very big Switching loss, so as to greatly limit the efficiency of whole inverter.
In order to overcome some drawbacks of H bridges, efficiency is further improved, some new inverter structures have also been proposed, such as Shown in Fig. 2 and Fig. 3.Wherein Fig. 2 is H5 inverters, and H5 inverters overcome biography well on the basis of a switching tube is increased Unite H bridges the defects of, the system effectiveness of transformerless type photovoltaic DC-to-AC converter is greatly improved, but in actual use its There are still the problem of uneven of generating heat, life-span and the reliability of circuit are reduced.Fig. 3 is HERIC (Highly Efficient Reliable Inverter Concept, the reliable inverter concept of high efficiency) structure, HERIC structures are same to be had well Common mode drain current suppressing ability, but its component used is relatively more.
On the other hand, during regenerative resource is generated electricity by way of merging two or more grid systems, the voltage of dc source may be in wide variation;Than Such as same photovoltaic cell group, in the case of different temperatures, DC voltage may change in 300V-700V.Under these conditions, pass System voltage source or current inverter become alias as 220V/380V low pressure and low power, generally require extra one-level DC/DC conversion Circuit come realize voltage adjust.It can so cause the efficiency of system relatively low, increase complexity, cost of system etc..
As shown in Figure 4 and Figure 5, it is two kinds of topological canonical topologies of the combining inverter of single stage type lifting press:The inversion of Z sources Device and Natural Soft-Switching inverter topology.The shortcomings that in order to overcome conventional inverter transformation to limit, professor F.Z.Peng proposes Famous Z-source inverter, as shown in figure 4, wherein Z1 forms Z source impedances, the inverter can realize buck by stage circuit Conversion, reduce power device quantity.Fig. 5 is Natural Soft-Switching inverter topology.It and traditional two-stage type hard switching inverter phase Than the controlling switch of original boosting DC/DC translation circuits is moved to flat wave capacitor branch road, turns into auxiliary switch;Normally swearing Operation time is measured, auxiliary switch is opened, and whole converter is a voltage source inverter;And in the change of current or boosting moment, auxiliary Switch OFF, whole converter turn into the current source inverter that voltage can be clamped.Z-source inverter changes equivalent inpnt power supply Property, it had not only been possessed has voltage source but also has a current source characteristic;Natural Soft-Switching inverter in different operating demand stage, Its input power shows voltage source or current source characteristic.At present, the principle of other single-stage lifting press inverter circuits and and this Two class circuits are similar.But this kind of there is a common drawback:Relative to conventional voltage source type interconnected inverter, loop of power circuit In additionally concatenated one, two even more than flat ripple inductance, extra power loss will be caused.
In the prior art, traditional two-stage grid-connected inverter is by boost DC-DC (DC-to-dc) circuit and inverter circuit Form, and the power switch in its two-stage circuit is very big with high-frequency work, switching loss.In the prior art, also wrap A kind of compound combining inverter of two-stage time division type is included, as shown in Figure 5.In the compound combining inverter of two-stage time division type, work as direct current When input voltage is less than line voltage, now combining inverter can be equivalent to the current source inverter being operated under boost mode; When DC input voitage is higher than line voltage, now it is inverse can be equivalent to the voltage source of work in buck mode for combining inverter Become device.Wherein, Fig. 6 and Fig. 7 sets forth the compound combining inverter of two-stage time division type and be operated in boost mode and decompression mode Under view.The compound combining inverter of two-stage time division type reduces switching loss, but in high frequency work in a boost mode During work, output filter is equivalent to CL-CL wave filters, although filter effect is strengthened, also brings power damage simultaneously Consumption increases the problem of being increased with control difficulty.
The defects of for prior art, 220V/380V low pressure is being carried out simultaneously to the larger DC input voitage of excursion During net, various power attenuations can be reduced by needing one kind badly, as switching loss, transmission line loss, efficiency are higher and in the absence of altogether The combining inverter of mode ship current problems.
The content of the invention
The present invention provides a kind of buck-boost grid-connected inverter, switching device is few, in the absence of current leakage, efficiency high, can The characteristics of realizing buck.
To achieve the above object, the present invention a kind of buck-boost grid-connected inverter of offer, is characterized in, the combining inverter Comprising:Step-up/step-down circuit, detection circuit and control circuit;The step-up/step-down circuit comprises at least:Direct voltage source, first switch Pipe, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube, the first inductance, the first diode, the two or two pole Pipe, the 3rd diode and filter capacitor;
The first switch pipe is connected between the positive pole of direct voltage source and first node, and the first inductance connection is first Between node and section point, the 3rd switching tube is connected between section point and fourth node;First diode is opened with second It is connected to after closing pipe series connection between first node and fourth node;Second diode is connected to second after being connected with the 4th switching tube Between node and the 3rd node;3rd diode is connected between first node and the 3rd node after being connected with the 5th switching tube;Institute The negative pole for stating direct voltage source is connected and is grounded with fourth node;The filter capacitor is connected to the 3rd node and Section four Between point, and the 3rd node connects power network AC power with fourth node as ac output end;
The detection circuit is used for the line voltage for detecting the DC voltage and power network AC power of direct voltage source, and instead Feed the control circuit;
The control circuit is used to send switch controlling signal to institute according to the DC voltage and line voltage of detection The controlled end of the switching tubes of first switch Guan Zhi five is stated, to control the step-up/step-down circuit to be operated in decompression, boosting and buck Mode of operation, wherein controlling the step-up/step-down circuit to work when the positive half cycle of power frequency and DC voltage are higher than the line voltage In decompression mode, the step-up/step-down circuit is controlled to be operated in liter when the positive half cycle of power frequency and DC voltage are less than the line voltage Die pressing type, the step-up/step-down circuit is controlled to be operated in buck-boost mode in power frequency negative half period.
In buck-boost grid-connected inverter of the present invention, it is preferable that the control circuit is big in detection line voltage In zero and DC voltage be higher than the line voltage when, send switch controlling signal control:First switch pipe high-frequency work, second Switching tube and the 4th switching tube closure, the 3rd switching tube and the 5th switching tube disconnect;So that it works in " decompression " pattern.
In buck-boost grid-connected inverter of the present invention, it is preferable that the control circuit is big in detection line voltage In zero and DC voltage be less than the line voltage when, send switch controlling signal control:3rd switching tube high-frequency work, first Switching tube and the 4th switching tube closure, second switch pipe and the 5th switching tube disconnect;So that it works in " boosting " pattern.
In buck-boost grid-connected inverter of the present invention, it is preferable that the control circuit is small in detection line voltage When zero, switch controlling signal control is sent:First switch pipe high-frequency work, the 3rd switching tube and the 5th switching tube closure, the Two switching tubes and the 4th switching tube disconnect;So that it works in " buck " pattern.
In buck-boost grid-connected inverter of the present invention, it is preferable that the step-up/step-down circuit also includes being connected to institute State the second inductance between the 3rd node and power network AC power.Second inductance can be by power transformer leakage inductance or power supply Line impedance replaces.
In buck-boost grid-connected inverter of the present invention, the first switch pipe and the 3rd switching tube can be adopted With any type of high frequency power switching tube.It is highly preferred that the first switch pipe and the 3rd switching tube are imitated for MOS type field Ying Guan, insulated gate bipolar transistor or integrated gate commutated thyristor.
In buck-boost grid-connected inverter of the present invention, the second switch pipe, the 4th switching tube and described 5th switching tube can use any type of IGCT.Preferably, the second switch pipe, the 4th switching tube and described 5th switching tube is MOS type FET, insulated gate bipolar transistor or integrated gate commutated thyristor.
In buck-boost grid-connected inverter of the present invention, it is preferable that first diode, the second diode and/ Or the 3rd diode by MOS type FET, insulated gate bipolar transistor or integrated gate commutated thyristor substitute, with improve The power of system.
In buck-boost grid-connected inverter of the present invention, it is preferable that first diode and second switch pipe It is overall, and/or the entirety of the second diode and the 4th switching tube, and/or the entirety of the 3rd diode and the 5th switching tube, by inverse Resistance type insulated gate bipolar transistor substitutes.
Buck-boost grid-connected inverter of the present invention is compared with the inverter of prior art, the advantage is that, the present invention relative to The various inverter power loop inductance pressure drops of tradition are minimum.In positive half cycle, when input direct voltage is higher than the wink of alternating voltage During the absolute value of duration, the topological equivalent circuit is the voltage source inverter using LCL filter, and opposite is exactly to be filtered using CL The current source inverter of ripple;During negative half period, the topoligical equivalence circuit is buck-boost inverter.The present invention can use whole audience effect Pipe is as switching device, and switching device is few, and an only switching tube is in high frequency state all the time, and conduction loss and switch damage Smaller, efficiency high is consumed, in the absence of common mode current leakage and buck can be realized.
Brief description of the drawings
Fig. 1 is the circuit diagram of prior art tradition H bridges topology;
Fig. 2 is the circuit diagram of prior art H5 combining inverters topology;
Fig. 3 is the circuit diagram of prior art HERIC combining inverters topology;
Fig. 4 is the circuit diagram of prior art Z-source inverter topology;
Fig. 5 is the circuit diagram of prior art Natural Soft-Switching inverter topology;
Fig. 6 is the boosting working state figure of the compound combining inverter of two-stage time division type;
Fig. 7 is the decompression working state figure of the compound combining inverter of two-stage time division type;
Fig. 8 be the preferred embodiment of the present invention buck-boost grid-connected inverter in step-up/step-down circuit schematic diagram;
Fig. 9 is the module frame chart of the buck-boost grid-connected inverter of the preferred embodiment of the present invention;
Reference is:100- step-up/step-down circuits;200- detects circuit;300- control circuits;E- direct voltage sources;Vg- Power network AC power;S1- first switch pipe;S2- second switch pipe;S3- the three switching tube;S4- the four switching tube;S5- the five opens Guan Guan;D1- the first diode;D2- the second diode;D3- the three diode;L1- the first inductance;Lg- the second inductance;C1- filtering Electric capacity;A- first nodes;B- section points;The nodes of c- the 3rd;D- fourth nodes.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is The part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people The every other embodiment that member is obtained on the premise of creative work is not made, belongs to the scope of protection of the invention.
Below in conjunction with accompanying drawing, specific embodiment of the invention is further illustrated.
Referring to Fig. 8, be the schematic diagram of step-up/step-down circuit in the buck-boost grid-connected inverter of the preferred embodiment of the present invention, figure 9 be the module frame chart of the buck-boost grid-connected inverter of the preferred embodiment of the present invention.As shown in Figure 8 and Figure 9, this embodiment disclose A kind of new buck-boost grid-connected inverter.The combining inverter includes:Step-up/step-down circuit 100, detection circuit 200 and control electricity Road 300.
Wherein step-up/step-down circuit 100 comprises at least direct voltage source E, first switch pipe S1, second switch pipe S2, the 3rd open Close pipe S3, the 4th switching tube S4, the 5th switching tube S5, the first inductance L1, the first diode D1, the second diode D2With the three or two pole Pipe D3
Wherein first switch pipe S1It is connected between direct voltage source E positive pole and first node a, the first inductance L1Connection Between first node a and section point b, the 3rd switching tube S3It is connected between section point b and fourth node d.
First diode D1With second switch pipe S2It is connected between first node a and fourth node d, and causes after series connection The branch road is in second switch pipe S2During closure conducting, electric current is only capable of from fourth node d single flow direction first nodes a.Preferably, One diode D1Negative electrode be connected with first node a, the first diode D1Anode and second switch pipe S2First end connection, Second switch pipe S2The second end be connected to fourth node d.
Second diode D2With the 4th switching tube S4It is connected between section point b and the 3rd node c, and causes after series connection The branch road is in the 4th switching tube S4During closure conducting, electric current is only capable of from the node c of section point b single flow directions the 3rd.Preferably, Two diode D2Anode be connected with section point b, the second diode D2Negative electrode and the 4th switching tube S4First end connection, 4th switching tube S4The second end be connected to fourth node d.
3rd diode D3With the 5th switching tube S5It is connected between first node a and the 3rd node c, and causes after series connection The branch road is in the 5th switching tube S5During closure conducting, electric current is only capable of from the 3rd node c single flow direction first nodes a.Preferably, Three diode D3Anode be connected with the 3rd node c, the 3rd diode D3Negative electrode and the 5th switching tube S5First end connection, 5th switching tube S5The second end be connected to first node a.
Direct voltage source E negative pole is connected and is grounded with fourth node d, and the 3rd node c and fourth node d are grid-connected as this Two ac output ends of inverter are connected to power network AC power Vg
The combining inverter also includes the filter capacitor C positioned at topology exchange outlet side1.Filter capacitor C1One end and the Three node c connections, the other end are connected with fourth node d.Preferably, the step-up/step-down circuit 100 also includes the second inductance Lg.This Two inductance LgOne terminal circuit connects the 3rd node c, one end connection power network AC power Vg.Second inductance LgCan also be with other Inductive element or resistance substitute, such as power transformer leakage inductance or power circuit impedance etc..
Detection circuit 200 is used for the DC voltage and power network AC power V for detecting direct voltage source EgLine voltage, and Feed back to control circuit 300.
Control circuit 300 is connected with detection circuit 200, is sentenced for the DC voltage according to detection and line voltage It is disconnected, switch controlling signal is sent in varied situations to the first switch pipe S in step-up/step-down circuit 1001To the 5th switching tube S5's Controlled end, to control step-up/step-down circuit 100 to be operated in the mode of operation of " decompression ", " boosting " and " buck ".
Therefore above-mentioned buck-boost grid-connected inverter has three kinds of mode of operations:" decompression " pattern, " boosting " pattern and " lifting Pressure " pattern.
Wherein when the positive half cycle of power frequency and DC voltage are higher than line voltage, step-up/step-down circuit 100 is operated in " decompression " mould Formula.Preferably, control module 300 detects current direct voltage source E DC voltage when detecting that line voltage is more than zero, When DC voltage is higher than power network AC power VgLine voltage in the case of, now circuit is operated in " decompression " pattern.Control Module 300 sends switch controlling signal such as pwm signal and gives first switch pipe S1To the 5th switching tube S5It is controlled to be in following shape State:First switch pipe S1High-frequency work, second switch pipe S2With the 4th switching tube S4Closure, the 3rd switching tube S3With the 5th switch Pipe S5Disconnect.Now the topological equivalent circuit is the voltage source inverter using LCL filter.In first switch pipe S1Closure When, direct voltage source E gives the first inductance L1Charging and simultaneously powering load;In first switch pipe S1During disconnection, the first inductance L1 In discharge condition, only by the first inductance L1To maintain output current.So first switch pipe S1High-frequency work is with regard to that can reach decompression Purpose.
When the positive half cycle of power frequency and DC voltage are less than line voltage, step-up/step-down circuit 100 is operated in " boosting " pattern.It is excellent Selection of land, control module 300 is when detecting that line voltage is more than zero, if direct voltage source E DC voltage is less than power network electricity In the case of the absolute value of pressure, now circuit is operated in " boosting " pattern.Control module 300 sends switch controlling signal such as PWM Signal gives first switch pipe S1To the 5th switching tube S5It is controlled to be in following state:3rd switching tube S3High-frequency work, first opens Close pipe S1With the 4th switching tube S4Closure, second switch pipe S2With the 5th switching tube S5Disconnect.Now the topological equivalent circuit is The current source inverter filtered using CL.In the 3rd switching tube S3During closure, direct voltage source E and the first inductance L1Form closure Loop, to the first inductance L1Energy storage, the second diode D2Filter capacitor C can be prevented1Discharge over the ground;In the 3rd switching tube S3It is disconnected When opening, due to the electric current retention performance of inductance, continue to filter capacitor C1Charging, filter capacitor C1Both end voltage raises.Such Three switching tube S3With regard to the purpose of boosting can be reached during high-frequency work.
Step-up/step-down circuit 100 is controlled to be operated in " buck " pattern in power frequency negative half period.Preferably, control module 300 When detecting that line voltage is less than zero, send switch controlling signal such as pwm signal and give first switch pipe S1To the 5th switching tube S5 It is controlled to be in following state:First switch pipe S1High-frequency work, the 3rd switching tube S3With the 5th switching tube S5Closure, first opens Close pipe S1High-frequency work, second switch pipe S2With the 4th switching tube S4Disconnect.Now the topoligical equivalence circuit is buck inversion Device.In first switch pipe S1During closure, direct voltage source E only gives the first inductance L1Charging;In first switch pipe S1During disconnection, the One inductance L1In discharge condition, only by the first inductance L1To maintain output current.So first switch pipe S1High-frequency work repeatedly Purpose with regard to buck can be reached.
First switch pipe S in the buck-boost grid-connected inverter of the present invention1With the 3rd switching tube S3Any class can be used The high frequency power switching tube of type replaces.Second switch pipe S2, the 4th switching tube S4With the 5th switching tube S5Any class can be used IGCT of type etc. replaces.Preferably, first switch pipe S in the present invention1To the 5th switching tube S5MOS type field can be used Effect pipe (MOSFET), insulated gate bipolar transistor (IGBT) or integrated gate commutated thyristor (IGCT) are realized.Such as First switch pipe S1To the 5th switching tube S5Use N-channel MOS type FET (MOSFET).By using MOS type field-effect Pipe can further reduce conduction loss as switching device.
In some embodiments of the invention, the second diode D2With the 4th switching tube S4Position can exchange.Three or two Pole pipe D3With the 5th switching tube S5Position can exchange.First diode D1With second switch pipe S2Position can exchange.The Two diode D2With the 4th switching tube S4An inverse-impedance type insulated gate bipolar transistor can be used to replace.3rd diode D3 With the 5th switching tube S5An inverse-impedance type insulated gate bipolar transistor can be used to replace.First diode D1And second switch Pipe S2An inverse-impedance type insulated gate bipolar transistor can be used to replace.So, the number of device can further be reduced.The One diode D1, the second diode D2, the 3rd diode D3Can be double with corresponding MOS type FET (MOSFET), insulated gate Bipolar transistor (IGBT) or integrated gate commutated thyristor (IGCT) replace, and improve the power of system.
In summary, the present invention is minimum relative to the various inverter power loop inductance pressure drops of tradition.During positive half cycle, when defeated When entering the absolute value for the instantaneous value that DC voltage is higher than alternating voltage, the topological equivalent circuit is the electricity using LCL filter Potential source inverter, opposite is exactly the current source inverter using CL filtering;During negative half period, the topoligical equivalence circuit is that buck is inverse Become device.The present invention can use full FET, and as switching device, switching device is few, all the time only at a switching tube In high frequency state, conduction loss and switching loss are smaller, efficiency high, in the absence of common mode current leakage and can realize lifting Pressure.
Finally it should be noted that:The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations;Although The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that:It still may be used To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic; And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and Scope.

Claims (10)

1. a kind of buck-boost grid-connected inverter, it is characterised in that the combining inverter includes:Step-up/step-down circuit, detection circuit and Control circuit;
The step-up/step-down circuit comprises at least:Direct voltage source (E), first switch pipe (S1), second switch pipe (S2), the 3rd open Close pipe (S3), the 4th switching tube (S4), the 5th switching tube (S5), the first inductance (L1), the first diode (D1), the second diode (D2), the 3rd diode (D3) and filter capacitor (C1);First switch pipe (the S1) it is connected to direct voltage source (E) positive pole Between first node (a), the first inductance (L1) be connected between first node (a) and section point (b), the 3rd switching tube (S3) be connected between section point (b) and fourth node (d);First diode (D1) and second switch pipe (S2) connect after series connection It is connected between first node (a) and fourth node (d);Second diode (D2) and the 4th switching tube (S4) is connected to after series connection Between two nodes (b) and the 3rd node (c);3rd diode (D3) and the 5th switching tube (S5) first node (a) is connected after series connection And the 3rd between node (c);Negative pole and fourth node (d) connection of the direct voltage source (E) and ground connection;The filter capacitor (C1) be connected between the 3rd node (c) and fourth node (d), and the 3rd node (c) and fourth node (d) conduct Ac output end connection power network AC power (Vg);
The detection circuit is used for the DC voltage and power network AC power (V for detecting direct voltage source (E)g) line voltage, and Feed back to the control circuit;
The control circuit is used to send switch controlling signal to described the according to the DC voltage and line voltage of detection One switching tube (S1) to the 5th switching tube (S5) controlled end, with control the step-up/step-down circuit be operated in decompression, boosting and lifting The mode of operation of pressure, wherein controlling the step-up/step-down circuit work when the positive half cycle of power frequency and DC voltage are higher than the line voltage Make in decompression mode, control the step-up/step-down circuit to be operated in when the positive half cycle of power frequency and DC voltage are less than the line voltage Boost mode, the step-up/step-down circuit is controlled to be operated in buck-boost mode in power frequency negative half period.
2. buck-boost grid-connected inverter as claimed in claim 1, it is characterised in that the control circuit is in detection line voltage When more than zero and DC voltage is higher than the line voltage, switch controlling signal control is sent:First switch pipe (S1) high frequency work Make, second switch pipe (S2) and the 4th switching tube (S4) closure, the 3rd switching tube (S3) and the 5th switching tube (S5) disconnect.
3. buck-boost grid-connected inverter as claimed in claim 1, it is characterised in that the control circuit is in detection line voltage When more than zero and DC voltage is less than the line voltage, switch controlling signal control is sent:3rd switching tube (S3) high frequency work Make, first switch pipe (S1) and the 4th switching tube (S4) closure, second switch pipe (S2) and the 5th switching tube (S5) disconnect.
4. buck-boost grid-connected inverter as claimed in claim 1, it is characterised in that the control circuit is in detection line voltage During less than zero, switch controlling signal control is sent:First switch pipe (S1) high-frequency work, the 3rd switching tube (S3) and the 5th switch Manage (S5) closure, second switch pipe (S2) and the 4th switching tube (S4) disconnect.
5. such as buck-boost grid-connected inverter according to any one of claims 1 to 4, it is characterised in that the step-up/step-down circuit Also include being connected to the 3rd node (c) and power network AC power (Vg) between the second inductance (Lg)。
6. such as buck-boost grid-connected inverter according to any one of claims 1 to 4, it is characterised in that the first switch pipe (S1) and the 3rd switching tube (S3) it is high frequency power switching tube.
7. such as buck-boost grid-connected inverter according to any one of claims 1 to 4, it is characterised in that the first switch pipe (S1) and the 3rd switching tube (S3) it is MOS type FET, insulated gate bipolar transistor or integrated gate commutated brilliant lock Pipe.
8. such as buck-boost grid-connected inverter according to any one of claims 1 to 4, it is characterised in that the second switch pipe (S2), the 4th switching tube (S4) and the 5th switching tube (S5) it is MOS type FET, insulated gate bipolar transistor Or integrated gate commutated thyristor.
9. such as buck-boost grid-connected inverter according to any one of claims 1 to 4, it is characterised in that first diode (D1), the second diode (D2) and/or the 3rd diode (D3) by MOS type FET, insulated gate bipolar transistor or integrated Door pole stream-exchanging thyristor substitutes.
10. such as buck-boost grid-connected inverter according to any one of claims 1 to 4, it is characterised in that first diode (D1) and second switch pipe (S2) entirety, and/or the second diode (D2) and the 4th switching tube (S3) entirety, and/or the 3rd Diode (D3) and the 5th switching tube (S5) entirety, substituted by inverse-impedance type insulated gate bipolar transistor.
CN201711050561.2A 2017-10-31 2017-10-31 A kind of buck-boost grid-connected inverter Pending CN107809182A (en)

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CN109541285A (en) * 2018-12-26 2019-03-29 东莞市长工微电子有限公司 BuckBoost circuit output current detection method and its detection circuit
CN111697859A (en) * 2020-07-03 2020-09-22 安徽工业大学 Buck-boost inverter and control method thereof
CN112260561A (en) * 2020-09-23 2021-01-22 北方工业大学 Voltage support type boost conversion circuit and grid connection method
CN113904576A (en) * 2021-10-26 2022-01-07 南京信息工程大学 Integrated boost photovoltaic grid-connected inverter and control method thereof
US11594969B2 (en) 2020-12-30 2023-02-28 Astec International Limited Non-inverting buck-boost converter
WO2023239330A1 (en) * 2022-06-10 2023-12-14 Aselsan Elektroni̇k Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ Single-phase, three-level, buck-boost inverter

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CN106374770A (en) * 2016-10-28 2017-02-01 燕山大学 Input and output common-ground boost-buck photovoltaic grid-connected inverter and control method thereof

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CN105356784A (en) * 2015-12-08 2016-02-24 上海海事大学 Grid connected inverter with DC bus voltage balance function
CN106374770A (en) * 2016-10-28 2017-02-01 燕山大学 Input and output common-ground boost-buck photovoltaic grid-connected inverter and control method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109541285A (en) * 2018-12-26 2019-03-29 东莞市长工微电子有限公司 BuckBoost circuit output current detection method and its detection circuit
CN109541285B (en) * 2018-12-26 2020-12-08 东莞市长工微电子有限公司 Buckboost circuit output current detection method and detection circuit thereof
CN111697859A (en) * 2020-07-03 2020-09-22 安徽工业大学 Buck-boost inverter and control method thereof
CN112260561A (en) * 2020-09-23 2021-01-22 北方工业大学 Voltage support type boost conversion circuit and grid connection method
CN112260561B (en) * 2020-09-23 2022-06-10 北方工业大学 Voltage support type boost conversion circuit and grid connection method
US11594969B2 (en) 2020-12-30 2023-02-28 Astec International Limited Non-inverting buck-boost converter
TWI826883B (en) * 2020-12-30 2023-12-21 香港商雅達電子國際有限公司 Non-inverting buck-boost converter
CN113904576A (en) * 2021-10-26 2022-01-07 南京信息工程大学 Integrated boost photovoltaic grid-connected inverter and control method thereof
CN113904576B (en) * 2021-10-26 2023-08-08 南京信息工程大学 Integrated boost photovoltaic grid-connected inverter and control method thereof
WO2023239330A1 (en) * 2022-06-10 2023-12-14 Aselsan Elektroni̇k Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ Single-phase, three-level, buck-boost inverter

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