CN106451533B - Quasi-single-stage transless gird-connected inverter and its control circuit - Google Patents
Quasi-single-stage transless gird-connected inverter and its control circuit Download PDFInfo
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- CN106451533B CN106451533B CN201610816423.XA CN201610816423A CN106451533B CN 106451533 B CN106451533 B CN 106451533B CN 201610816423 A CN201610816423 A CN 201610816423A CN 106451533 B CN106451533 B CN 106451533B
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Classifications
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- H02J3/383—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion 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
- H02M7/53—Conversion 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
- H02M7/537—Conversion 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
- H02M7/5387—Conversion 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 in a bridge configuration
- H02M7/53871—Conversion 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 in a bridge configuration with automatic control of output voltage or current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses quasi-single-stage transless gird-connected inverter and its control circuits.The gird-connected inverter includes dc power translation circuit and full bridge inverter, wherein, full bridge inverter includes the first to the 6th power switch tube, power diode, first, second DC capacitor, the first, second filter inductance and ac filter capacitor, and there are two types of connection types, corresponding to two kinds of full-bridge inverting topologys, there are two types of control circuits respectively.The present invention reduces the number of transitions of output power of photovoltaic module, reduces on-state loss, improves system effectiveness.
Description
Technical field
The invention belongs to converters technical fields, in particular to quasi-single-stage transless gird-connected inverter and
Its control circuit.
Background technique
Photovoltaic generating system is connected according to whether with public electric wire net, is divided into and being incorporated into the power networks and independent operating two ways.Its
In, being incorporated into the power networks is generation of electricity by new energy using most common mode, and gird-connected inverter is as the pass in new energy grid connection system
Key member, improves its conversion efficiency and power density is of great significance.
Relative to the gird-connected inverter comprising Industrial Frequency Transformer, transless gird-connected inverter has conversion efficiency height, body
The small and light-weight advantage of product, therefore be widely applied.Traditional two-stage type photovoltaic combining inverter, the output of photovoltaic module string
All power be both needed to cause conversion efficiency to be difficult to improve by two-stage high frequency conversion.In view of the above-mentioned problems, document " Zhao Z,
Xu M,Chen Q,et al.Derivation,analysis,and implementation of a boost-buck
converter-based high-efficiency PV inverter.IEEE Transactions on Power
Electronics.2012,27 (3): 1304-1313. " proposes that photovoltaic module voltage is first boosted by Boost circuit, then by Buck
Circuit high frequency is transformed to steamed bun wave, grid-connected finally by power frequency bridge commutation, reduces switching loss, improves system effectiveness.Text
" Wu W, Ji J, Blaabjerg F, et al.Aalborg inverter-a new type of " buck in buck is offered,
boost in boost”grid-tied inverter.IEEE Transactions on Power Electronics,
2015,30 (9): 4784-4793. " proposes a kind of improved three-level formula gird-connected inverter structure, reduces inductance quantity, equally
Improve conversion efficiency.
But above two scheme convert output power of photovoltaic module need to all by three-level, on-state loss is high, is
Efficiency of uniting is in urgent need to be improved.Therefore, it is necessary to study a kind of photovoltaics for having high efficiency, low-leakage current and bidirectional power flow operation out
Gird-connected inverter and its control method.
Summary of the invention
In order to solve the technical issues of above-mentioned background technique proposes, the present invention is intended to provide quasi-single-stage transless is grid-connected inverse
Become device and its control circuit, reduce the number of transitions of output power of photovoltaic module, reduce on-state loss, improves system effectiveness.
In order to achieve the above technical purposes, the technical solution of the present invention is as follows:
A kind of quasi-single-stage transless gird-connected inverter, including dc power translation circuit and full bridge inverter；It is described
Full bridge inverter include the first power switch tube, the second power switch tube, third power switch tube, the 4th power switch tube,
5th power switch tube, the 6th power switch tube, power diode, the first DC capacitor, the second DC capacitor, the first filtered electrical
Sense, the second filter inductance and ac filter capacitor；The anode of first DC capacitor is separately connected the anode and the 6th of photo-voltaic power supply
The drain electrode of power switch tube, the cathode of the first DC capacitor be separately connected the cathode of photo-voltaic power supply, the second DC capacitor cathode,
The source electrode of the source electrode of third power switch tube and the 4th power switch tube, anode the 5th power switch of connection of the second DC capacitor
The source electrode of the drain electrode of pipe, the 5th power switch tube is separately connected the collector of the cathode of power diode, the first power switch tube
With the collector of the second power switch tube, the anode of power diode connects the source electrode of the 6th power switch tube, and the first power is opened
Close the drain electrode of the emitter connection third power switch tube of pipe and one end of the first filter inductance, the other end of the first filter inductance
One end of ac filter capacitor is connected, the other end of ac filter capacitor connects one end of the second filter inductance, the second filtered electrical
The other end of sense is separately connected the emitter of the second power switch tube and the drain electrode of the 4th power switch tube, ac filter capacitor
Power grid is accessed at both ends, the anode of the first end connection photo-voltaic power supply of dc power translation circuit, and the of dc power translation circuit
Two ends connect the cathode of the second DC capacitor, and the third end of dc power translation circuit connects the anode of the second DC capacitor.
Further, the dc power translation circuit is boost conversion circuit, output voltage and input voltage homopolarity
Property, the voltage that dc power translation circuit controls on the second DC capacitor is constant, and is higher than network voltage peak value.
Based on the control circuit of above-mentioned quasi-single-stage transless gird-connected inverter, including current sensor, first~third
Voltage sensor, current regulator, gating circuit, absolute value counting circuit, the first~the second subtracter, the first~the second division
Device, adder, multiplier, the first~the 4th phase inverter, first~third comparator, the first~the second with door or door, first~
6th driving circuit；The electric current that current sensor samples the first filter inductance obtains inductor current feedback signal iLf, the first subtraction
The negative input end of device accesses iLf, the positive input terminal access inductive current reference signal i of the first subtracterLr, the first subtracter it is defeated
Outlet is connected through inductive current adjuster and the first input end of adder, the first DC capacitor of first voltage sensor sample
Voltage obtains the first DC capacitor voltage feedback signal uCdc1f, the first input end access u of the first dividerCdc1f, second voltage
The voltage of the second DC capacitor of sensor sample obtains the second DC capacitor voltage feedback signal uCdc2f, the first of the second divider
The positive input terminal of input terminal and the second subtracter is respectively connected to uCdc2f, the negative input end access DC bias signal of the second subtracter
uBias, the positive input terminal of the output end of the second subtracter and first comparator connects, the negative input end of first comparator and absolutely
Be worth counting circuit output end connection, the output end of first comparator be separately connected the third input terminal of gating circuit, first with
The first input end of door and the input terminal of the 4th phase inverter, the output end of the 4th phase inverter and second and the first input end of door company
It connects, tertiary voltage sensor sample network voltage obtains network voltage feedback signal ugf, the input terminal of absolute value counting circuit,
Second input terminal of one divider, the second input terminal of the second divider are respectively connected to ugf, the first input end of gating circuit connects
Enter the output end signal u of the first dividergff1, the output end u of the second input terminal the second divider of access of gating circuitgff2, multiply
The output end signal u of the first input end access gating circuit of musical instruments used in a Buddhist or Taoist massgff, the second input terminal access proportionality coefficient k of multiplier,
Second input terminal of the output end connection adder of multiplier, the output end of adder are separately connected the positive input of the second comparator
The input terminal at end and the first phase inverter, the positive input terminal of the output end connection third comparator of the first phase inverter, the second comparator
Negative-phase input and the negative-phase input of third comparator be respectively connected to triangle carrier signal ust, the output end of the second comparator
It is separately connected the input terminal of the input terminal of the second phase inverter or the first input end of door and the 4th driving circuit, and by 4 wheel driven
The driving signal u of dynamic the 4th power switch tube of circuit outputgs4, the output end of the second phase inverter connects the defeated of the second driving circuit
Enter end, the second driving circuit exports the driving signal u of the second power switch tubegs2, the output end of third comparator is separately connected
The input terminal of the input terminal of three phase inverters or the second input terminal of door and third driving circuit, third driving circuit export third
The driving signal u of power switch tubegs3, the input terminal of output end the first driving circuit of connection of third phase inverter, the first driving electricity
Road exports the driving signal u of the first power switch tubegs1Or the output end of door be separately connected first with the second input terminal of door and
Second with the second input terminal of door, first connect the input terminal of the 6th power switch tube, the 6th power switch with the output end of door
Pipe exports the driving signal u of the 6th power switch tubegs6, second connect the input terminal of the 5th driving circuit with the output end of door, the
Five driving circuits export the driving signal u of the 5th power switch tubegs5。
Further, when the output signal of the first comparator is high level, the output end signal u of gating circuitgffDeng
In first input end signal ugff1；When the output signal of the first comparator is low level, the output end signal of gating circuit
ugffEqual to the second input end signal ugff2。
Further, the amplitude of the proportionality coefficient k and triangle carrier signal ustAmplitude it is equal；The direct current biasing letter
Number uBiasGreater than zero.
The invention also provides another quasi-single-stage transless gird-connected inverter, including dc power translation circuit and complete
Bridge inverter circuit；The full bridge inverter include the first power switch tube, the second power switch tube, third power switch tube,
4th power switch tube, the 5th power switch tube, the 6th power switch tube, power diode, the first DC capacitor, the second direct current
Capacitor, the first filter inductance, the second filter inductance and ac filter capacitor；The anode of first DC capacitor is separately connected photovoltaic electric
The anode in source and the anode of power diode, the cathode of the first DC capacitor are separately connected the cathode of photo-voltaic power supply, the second direct current
The drain electrode of the source electrode of the cathode of capacitor and the 6th power switch tube, the 6th power switch tube is separately connected third power switch tube
The emitter of emitter and the 4th power switch tube, the drain electrode of anode the 5th power switch tube of connection of the second DC capacitor, the
The source electrode of five power switch tubes is separately connected the cathode of power diode, the drain electrode of the first power switch tube and the second power switch
The drain electrode of pipe, the collector of the source electrode connection third power switch tube of the first power switch tube and one end of the first filter inductance,
One end of the other end connection ac filter capacitor of first filter inductance, the other end of ac filter capacitor connect the second filtered electrical
One end of sense, the other end of the second filter inductance are separately connected the source electrode of the second power switch tube and the collection of the 4th power switch tube
Power grid is accessed at electrode, the both ends of ac filter capacitor, and the first end of dc power translation circuit connects the anode of photo-voltaic power supply, directly
The cathode that power conversion circuit second end connects the second DC capacitor is flowed, the third end connection second of dc power translation circuit is straight
The anode that galvanic electricity is held.
Further, the dc power translation circuit is boost conversion circuit, output voltage and input voltage homopolarity
Property, the voltage that dc power translation circuit controls on the second DC capacitor is constant, and is higher than network voltage peak value.
Based on the control circuit of above-mentioned quasi-single-stage transless gird-connected inverter, including current sensor, first~third
Voltage sensor, current regulator, gating circuit, absolute value counting circuit, the first~the second subtracter, the first~the second division
Device, adder, multiplier, the first~the 4th phase inverter, first~third comparator and door or door, the first~the 6th driving electricity
Road；The electric current that current sensor samples the first filter inductance obtains inductor current feedback signal iLf, the negative input of the first subtracter
It terminates into iLf, the positive input terminal access inductive current reference signal i of the first subtracterLr, the output end of the first subtracter is through inductance
Current regulator and the first input end of adder connect, and the voltage of the first DC capacitor of first voltage sensor sample obtains the
One DC capacitor voltage feedback signal uCdc1f, the first input end access u of the first dividerCdc1f, second voltage sensor sample
The voltage of second DC capacitor obtains the second DC capacitor voltage feedback signal uCdc2f, the first input end of the second divider and
The positive input terminal of two subtracters is respectively connected to uCdc2f, the negative input end access DC bias signal u of the second subtracterBias, second
The output end of subtracter and the positive input terminal of first comparator connect, the negative input end and absolute value counting circuit of first comparator
Output end connection, the output end of first comparator is separately connected the input of the third input terminal and the 4th phase inverter of gating circuit
End, the first input end of the output end connection and door of the 4th phase inverter, tertiary voltage sensor sample network voltage obtain power grid
Voltage feedback signal ugf, the input terminal of absolute value counting circuit, the second input terminal of the first divider, the second divider second
Input terminal is respectively connected to ugf, the output end signal u of first input end the first divider of access of gating circuitgff1, gating circuit
The second input terminal access the second divider output end ugff2, the output end of the first input end access gating circuit of multiplier
Signal ugff, the second input terminal access proportionality coefficient k of multiplier, the second input terminal of the output end connection adder of multiplier,
The output end of adder is separately connected the positive input terminal of the second comparator and the input terminal of the first phase inverter, the first phase inverter it is defeated
Outlet connects the positive input terminal of third comparator, the negative-phase input of the second comparator and the negative-phase input point of third comparator
It Jie Ru not triangle carrier signal ust, the output end of the second comparator be separately connected the second phase inverter input terminal or door first
The input terminal of input terminal and the 4th driving circuit, and by the driving signal u of the 4th driving the 4th power switch tube of circuit outputgs4,
The output end of second phase inverter connects the input terminal of the second driving circuit, and the second driving circuit exports the drive of the second power switch tube
Dynamic signal ugs2, the output end of third comparator is separately connected the input terminal of third phase inverter or the second input terminal and third of door
The input terminal of driving circuit, third driving circuit export the driving signal u of third power switch tubegs3, the output of third phase inverter
The input terminal of the first driving circuit of end connection, the first driving circuit export the driving signal u of the first power switch tubegs1Or door
Output end connection and the second input terminal of door and the input terminal of the 6th power switch tube, the 6th power switch tube export the 6th power
The driving signal u of switching tubegs6, the input terminal of the 5th driving circuit, the 5th driving circuit output the 5th are connect with the output end of door
The driving signal u of power switch tubegs5。
Further, when the output signal of the first comparator is high level, the output end signal u of gating circuitgffDeng
In first input end signal ugff1；When the output signal of the first comparator is low level, the output end signal of gating circuit
ugffEqual to the second input end signal ugff2。
Further, the amplitude of the proportionality coefficient k and triangle carrier signal ustAmplitude it is equal；The direct current biasing letter
Number uBiasGreater than zero.
By adopting the above technical scheme bring the utility model has the advantages that
The present invention reduces the transformation series of photo-voltaic power supply power, so that only Partial Power is by dc power transformation electricity
Road high frequency conversion, reduces power loss.Meanwhile the present invention has the characteristics of bidirectional power flow operation and low-leakage current.Therefore,
The present invention is suitable for the grid-connected application of single-phase transless, especially for conversion efficiency and the higher photovoltaic of leakage current requirement
The field of generating electricity by way of merging two or more grid systems has broad application prospects.
Detailed description of the invention
Fig. 1 is the quasi-single-stage transless gird-connected inverter circuit diagram of the embodiment of the present invention one；
Fig. 2 is dc power translation circuit topological diagram in embodiment one；
Fig. 3 is the electric operation control circuit figure of full bridge inverter in embodiment one；
Fig. 4 (a) -4 (f) is six kinds of operation mode figures of embodiment one；
Fig. 5 is the quasi-single-stage transless gird-connected inverter circuit diagram of the embodiment of the present invention two；
Fig. 6 is dc power translation circuit topological diagram in embodiment two；
Fig. 7 is the electric operation control circuit figure of full bridge inverter in embodiment two；
Fig. 8 (a) -8 (f) is six kinds of operation mode figures of embodiment two.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention is described in detail.
A kind of quasi-single-stage transless gird-connected inverter, including dc power translation circuit and full bridge inverter.This hair
It is bright to propose the specific connection structure of 2 kinds of each components of full bridge inverter.
The first topological structure of the invention as shown in Figure 1, full bridge inverter 2 include the first power switch tube S1,
Two power switch tube Ss2, third power switch tube S3, the 4th power switch tube S4, the 5th power switch tube S5, the 6th power switch
Pipe S6, power diode D, the first DC capacitor Cdc1, the second DC capacitor Cdc2, the first filter inductance Lf1, the second filter inductance
Lf2With ac filter capacitor Cf。
First DC capacitor Cdc1Anode be separately connected photo-voltaic power supply PV anode and the 6th power switch tube S6Leakage
Pole, the first DC capacitor Cdc1Cathode be separately connected the cathode of photo-voltaic power supply PV, the second DC capacitor Cdc2Cathode, third function
Rate switching tube S3Source electrode and the 4th power switch tube S4Source electrode, the second DC capacitor Cdc2Anode connection the 5th power switch
Pipe S5Drain electrode, the 5th power switch tube S5Source electrode be separately connected the cathode of power diode D, the first power switch tube S1's
Collector and the second power switch tube S2Collector, the anode of power diode D connects the 6th power switch tube S6Source electrode,
First power switch tube S1Emitter connect third power switch tube S3Drain electrode and the first filter inductance Lf1One end, first
Filter inductance Lf1The other end connect ac filter capacitor CfOne end, ac filter capacitor CfThe other end connection second filtering
Inductance Lf2One end, the second filter inductance Lf2The other end be separately connected the second power switch tube S2Emitter and the 4th power
Switching tube S4Drain electrode, ac filter capacitor CfBoth ends access power grid, the first end of dc power translation circuit 1 connects photovoltaic
The second end of the anode of power supply, dc power translation circuit 1 connects the second DC capacitor Cdc2Cathode, dc power transformation electricity
The third end on road 1 connects the second DC capacitor Cdc2Anode.
Dc power translation circuit 1 controls the second DC capacitor Cdc2On voltage be steady state value, and be greater than network voltage ug
Peak value.A variety of circuit topologies can be used in dc power translation circuit 1, and Fig. 2 gives a kind of dc power translation circuit topology,
Using Boost translation circuit.The circuit and its element are not described in detail herein, and those of ordinary skill in the art pass through in reading
State content, it is possible to understand that its connection type, composition and function.
To realize that quasi-single-stage gird-connected inverter has low leakage characteristic, the full-bridge inverting of the first above-mentioned topology is devised
The control circuit of circuit, as shown in Figure 3.The control circuit includes current sensor, first~tertiary voltage sensor, electric current tune
Save device, gating circuit, absolute value counting circuit, the first~the second subtracter, the first~the second divider, adder, multiplier,
First~the 4th phase inverter, first~third comparator, the first~the second and door or door, the first~the 6th driving circuit.
Current sensor samples the first filter inductance Lf1Electric current obtain inductor current feedback signal iLf, the first subtracter
Negative input end access iLf, the positive input terminal access inductive current reference signal i of the first subtracterLr, the output of the first subtracter
End is connected through inductive current adjuster and the first input end of adder, the first DC capacitor of first voltage sensor sample Cdc1
Voltage obtain the first DC capacitor voltage feedback signal uCdc1f, the first input end access u of the first dividerCdc1f, the second electricity
Pressure sensor samples the second DC capacitor Cdc2Voltage obtain the second DC capacitor voltage feedback signal uCdc2f, the second divider
First input end and the positive input terminal of the second subtracter be respectively connected to uCdc2f, it is inclined that the negative input end of the second subtracter accesses direct current
Confidence uBias, the positive input terminal of the output end of the second subtracter and first comparator connects, the negative input end of first comparator
Connect with the output end of absolute value counting circuit, the output end of first comparator be separately connected gating circuit third input terminal,
First with the first input end of door and the input terminal of the 4th phase inverter, the output end of the 4th phase inverter is defeated with the first of door with second
Enter end connection, tertiary voltage sensor sample network voltage obtains network voltage feedback signal ugf, absolute value counting circuit it is defeated
Enter end, the second input terminal of the second input terminal of the first divider, the second divider is respectively connected to ugf, the first of gating circuit be defeated
Enter the output end signal u terminated into the first dividergff1, the output end of the second input terminal the second divider of access of gating circuit
ugff2, the output end signal u of the first input end access gating circuit of multipliergff, the second input terminal access ratio of multiplier
Coefficient k, the second input terminal of the output end connection adder of multiplier, the output end of adder are separately connected the second comparator
The input terminal of positive input terminal and the first phase inverter, the positive input terminal of the output end connection third comparator of the first phase inverter, second
The negative-phase input of comparator and the negative-phase input of third comparator are respectively connected to triangle carrier signal ust, the second comparator
Output end is separately connected the input terminal of the input terminal of the second phase inverter or the first input end of door and the 4th driving circuit, and by
4th driving the 4th power switch tube S of circuit output4Driving signal ugs4, the second driving of output end connection of the second phase inverter
The input terminal of circuit, the second driving circuit export the second power switch tube S2Driving signal ugs2, the output end of third comparator
It is separately connected the input terminal of the input terminal of third phase inverter or the second input terminal of door and third driving circuit, third driving electricity
Road exports third power switch tube S3Driving signal ugs3, the input of output end the first driving circuit of connection of third phase inverter
End, the first driving circuit export the first power switch tube S1Driving signal ugs1Or the output end of door is separately connected first and door
The second input terminal and second with the second input terminal of door, first connect the input of the 6th power switch tube with the output end of door
End, the 6th power switch tube export the 6th power switch tube S6Driving signal ugs6, second connect the 5th drive with the output end of door
The input terminal of dynamic circuit, the 5th driving circuit export the 5th power switch tube S5Driving signal ugs5。
Wherein, when the output signal of first comparator is high level, the output end signal u of gating circuitgffIt is defeated equal to first
Enter end signal ugff1；When the output signal of first comparator is low level, the output end signal u of gating circuitgffIt is defeated equal to second
Enter end signal ugff2.The amplitude and triangle carrier signal u of proportionality coefficient kstAmplitude it is equal.DC bias signal uBiasIt is greater than
Zero.
Based on control circuit shown in Fig. 3, the full bridge inverter of the first topology includes six kinds of operation modes, successively such as
Shown in Fig. 4 (a) -4 (f).
First mode: the first power switch tube S1, the 4th power switch tube S4With the 5th power switch tube S5It is open-minded, no matter
6th power switch tube S6Whether open-minded, grid current is by photo-voltaic power supply UPVFlow to power grid ug。
Second mode: the first power switch tube S1, the 4th power switch tube S4With the 6th power switch tube S6It is open-minded, it is other
Switching tube shutdown, power diode D conducting, grid current is by photo-voltaic power supply UPVFlow to power grid ug。
Third mode: the first power switch tube S1Open-minded, rest switch pipe shutdown, grid current passes through the first power switch
Pipe S1With the second power switch tube S2Anti-paralleled diode afterflow.
4th mode: the second power switch tube S2, third power switch tube S3With the 5th power switch tube S5It is open-minded, no matter
6th power switch tube S6Whether open-minded, grid current is by photo-voltaic power supply UPVFlow to power grid ug。
5th mode: the second power switch tube S2, third power switch tube S3With the 6th power switch tube S6It is open-minded, it is other
Switching tube shutdown, power diode D conducting, grid current is by photo-voltaic power supply UPVFlow to power grid ug。
6th mode: the second power switch tube S2Open-minded, rest switch pipe shutdown, grid current passes through the second power switch
Pipe S2With the first power switch tube S1Anti-paralleled diode afterflow.
Network voltage positive half cycle, power grid ugVoltage magnitude be higher than photo-voltaic power supply UPVWhen amplitude, full bridge inverter is
Switch between one mode and third mode；Power grid ugVoltage magnitude be lower than photo-voltaic power supply UPVWhen amplitude, full bridge inverter exists
Switch between second mode and third mode.
Network voltage negative half period, power grid ugAbsolute value of voltage amplitude be higher than photo-voltaic power supply UPVWhen amplitude, full-bridge inverting
Circuit switches between the 4th mode and the 6th mode；Power grid ugAbsolute value of voltage amplitude be lower than photo-voltaic power supply UPVAmplitude
When, full bridge inverter switches between the 5th mode and the 6th mode.
The invention also provides second of topologys of full bridge inverter, as shown in Figure 5.Full bridge inverter 2 ' includes the
One power switch tube S11, the second power switch tube S12, third power switch tube S13, the 4th power switch tube S14, the 5th power opens
Close pipe S15, the 6th power switch tube S16, power diode D11, the first DC capacitor Cdc11, the second DC capacitor Cdc12, first filter
Wave inductance Lf11, the second filter inductance Lf12With ac filter capacitor Cf1.
First DC capacitor Cdc11Anode be separately connected photo-voltaic power supply PV anode and power diode D11Anode,
One DC capacitor Cdc11Cathode be separately connected the cathode of photo-voltaic power supply PV, the second DC capacitor Cdc12Cathode and the 6th power
Switching tube S16Source electrode, the 6th power switch tube S16Drain electrode be separately connected third power switch tube S13Emitter and the 4th
Power switch tube S14Emitter, the second DC capacitor Cdc12Anode connection the 5th power switch tube S15Drain electrode, the 5th function
Rate switching tube S15Source electrode be separately connected power diode D11Cathode, the first power switch tube S11Drain electrode and the second power
Switching tube S12Drain electrode, the first power switch tube S11Source electrode connect third power switch tube S13Collector and first filtering
Inductance Lf11One end, the first filter inductance Lf11The other end connect ac filter capacitor Cf1One end, ac filter capacitor Cf1
The other end connect the second filter inductance Lf12One end, the second filter inductance Lf12The other end be separately connected the second power switch
Pipe S12Source electrode and the 4th power switch tube S14Collector, ac filter capacitor Cf1Both ends access power grid, dc power become
The anode of the first end connection photo-voltaic power supply of circuit 1 ' is changed, the second end of dc power translation circuit 1 ' connects the second DC capacitor
Cdc12Cathode, the third end of dc power translation circuit 1 ' connects the second DC capacitor Cdc12Anode.
Dc power translation circuit 1 ' is still using the above structure, specific as shown in Figure 6.
To realize that quasi-single-stage gird-connected inverter has low leakage characteristic, the full-bridge that the present invention devises second of topology is inverse
The control circuit on power transformation road, as shown in Figure 7.The control circuit includes current sensor, first~tertiary voltage sensor, electric current
Adjuster, gating circuit, absolute value counting circuit, the first~the second subtracter, the first~the second divider, adder, multiplication
Device, the first~the 4th phase inverter, first~third comparator and door or door, the first~the 6th driving circuit；Current sensor
Sample the first filter inductance Lf11Electric current obtain inductor current feedback signal iLf, the negative input end access i of the first subtracterLf,
The positive input terminal of first subtracter accesses inductive current reference signal iLr, the output end of the first subtracter is through inductive current adjuster
It is connect with the first input end of adder, the first DC capacitor of first voltage sensor sample Cdc11Voltage obtain the first direct current
Capacitance voltage feedback signal uCdc1f, the first input end access u of the first dividerCdc1f, second voltage sensor sample second is directly
Galvanic electricity holds Cdc12Voltage obtain the second DC capacitor voltage feedback signal uCdc2f, the first input end of the second divider and second
The positive input terminal of subtracter is respectively connected to uCdc2f, the negative input end access DC bias signal u of the second subtracterBias, second subtracts
The output end of musical instruments used in a Buddhist or Taoist mass and the positive input terminal of first comparator connect, negative input end and the absolute value counting circuit of first comparator
Output end connection, the output end of first comparator are separately connected the input of the third input terminal and the 4th phase inverter of gating circuit
End, the first input end of the output end connection and door of the 4th phase inverter, tertiary voltage sensor sample network voltage obtain power grid
Voltage feedback signal ugf, the input terminal of absolute value counting circuit, the second input terminal of the first divider, the second divider second
Input terminal is respectively connected to ugf, the output end signal u of first input end the first divider of access of gating circuitgff1, gating circuit
The second input terminal access the second divider output end ugff2, the output end of the first input end access gating circuit of multiplier
Signal ugff, the second input terminal access proportionality coefficient k of multiplier, the second input terminal of the output end connection adder of multiplier,
The output end of adder is separately connected the positive input terminal of the second comparator and the input terminal of the first phase inverter, the first phase inverter it is defeated
Outlet connects the positive input terminal of third comparator, the negative-phase input of the second comparator and the negative-phase input point of third comparator
It Jie Ru not triangle carrier signal ust, the output end of the second comparator be separately connected the second phase inverter input terminal or door first
The input terminal of input terminal and the 4th driving circuit, and by the 4th driving the 4th power switch tube S of circuit output14Driving signal
ugs4, the input terminal of output end the second driving circuit of connection of the second phase inverter, the second driving circuit the second power switch tube of output
S12Driving signal ugs2, the output end of third comparator is separately connected the input terminal of third phase inverter or the second input terminal of door
With the input terminal of third driving circuit, third driving circuit exports third power switch tube S13Driving signal ugs3, third reverse phase
The output end of device connects the input terminal of the first driving circuit, and the first driving circuit exports the first power switch tube S11Driving signal
ugs1Or the output end of door connects and the second input terminal of door and the input terminal of the 6th power switch tube, the 6th power switch tube is defeated
6th power switch tube S out16Driving signal ugs6, the input terminal of the 5th driving circuit, the 5th driving are connect with the output end of door
The 5th power switch tube S of circuit output15Driving signal ugs5。
Based on control circuit shown in Fig. 7, the first way of full bridge inverter includes six kinds of operation modes, such as Fig. 8
(a) shown in -8 (b):
First mode: the first power switch tube S11, the 4th power switch tube S14, the 5th power switch tube S15With the 6th function
Rate switching tube S16Open-minded, grid current is by photo-voltaic power supply UPVFlow to power grid ug。
Second mode: the first power switch tube S11, the 4th power switch tube S14With the 6th power switch tube S16It is open-minded,
The shutdown of its switching tube, power diode D1Conducting, grid current is by photo-voltaic power supply UPVFlow to power grid ug。
Third mode: the 4th power switch tube S14Open-minded, rest switch pipe shutdown, grid current passes through the 4th power switch
Pipe S14With third power switch tube S13Anti-paralleled diode afterflow.
4th mode: the second power switch tube S12, third power switch tube S13With the 5th power switch tube S15With the 6th function
Rate switching tube S16Open-minded, grid current is by photo-voltaic power supply UPVFlow to power grid ug。
5th mode: the second power switch tube S12, third power switch tube S13With the 6th power switch tube S16It is open-minded,
The shutdown of its switching tube, power diode D1Conducting, grid current is by photo-voltaic power supply UPVFlow to power grid ug。
6th mode: third power switch tube S13Open-minded, rest switch pipe shutdown, grid current passes through third power switch
Pipe S13With the 4th power switch tube S14Anti-paralleled diode afterflow.
Network voltage positive half cycle, power grid ugVoltage magnitude be higher than photo-voltaic power supply UPVWhen amplitude, full bridge inverter is
Switch between one mode and third mode；Power grid ugVoltage magnitude be lower than photo-voltaic power supply UPVWhen amplitude, full bridge inverter exists
Switch between second mode and third mode.
Network voltage negative half period, power grid ugAbsolute value of voltage amplitude be higher than photo-voltaic power supply UPVWhen amplitude, full-bridge inverting
Circuit switches between the 4th mode and the 6th mode；Power grid ugAbsolute value of voltage amplitude be lower than photo-voltaic power supply UPVAmplitude
When, full bridge inverter switches between the 5th mode and the 6th mode.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (10)
1. a kind of quasi-single-stage transless gird-connected inverter, it is characterised in that: inverse including dc power translation circuit (1) and full-bridge
Power transformation road (2)；The full bridge inverter (2) includes the first power switch tube (S1), the second power switch tube (S2), third function
Rate switching tube (S3), the 4th power switch tube (S4), the 5th power switch tube (S5), the 6th power switch tube (S6), two pole of power
It manages (D), the first DC capacitor (Cdc1), the second DC capacitor (Cdc2), the first filter inductance (Lf1), the second filter inductance (Lf2)
With ac filter capacitor (Cf)；First DC capacitor (Cdc1) anode be separately connected photo-voltaic power supply anode and the 6th power open
Close pipe (S6) drain electrode, the first DC capacitor (Cdc1) cathode be separately connected the cathode of photo-voltaic power supply, the second DC capacitor
(Cdc2) cathode, third power switch tube (S3) source electrode and the 4th power switch tube (S4) source electrode, the second DC capacitor
(Cdc2) anode connection the 5th power switch tube (S5) drain electrode, the 5th power switch tube (S5) source electrode be separately connected power two
The cathode of pole pipe (D), the first power switch tube (S1) collector and the second power switch tube (S2) collector, two pole of power
The anode for managing (D) connects the 6th power switch tube (S6) source electrode, the first power switch tube (S1) emitter connect third power
Switching tube (S3) drain electrode and the first filter inductance (Lf1) one end, the first filter inductance (Lf1) the other end connect ac filter
Capacitor (Cf) one end, ac filter capacitor (Cf) the other end connect the second filter inductance (Lf2) one end, the second filtered electrical
Feel (Lf2) the other end be separately connected the second power switch tube (S2) emitter and the 4th power switch tube (S4) drain electrode, hand over
Flow filter capacitor (Cf) both ends access power grid, dc power translation circuit (1) first end connection photo-voltaic power supply anode, directly
The second end for flowing power conversion circuit (1) connects the second DC capacitor (Cdc2) cathode, the of dc power translation circuit (1)
Three ends connect the second DC capacitor (Cdc2) anode.
2. a kind of quasi-single-stage transless gird-connected inverter according to claim 1, it is characterised in that: the dc power becomes
Changing circuit (1) is boost conversion circuit, output voltage and input voltage same polarity, dc power translation circuit (1) control the
Two DC capacitor (Cdc2) on voltage it is constant, and be higher than network voltage peak value.
3. a kind of control circuit, for controlling quasi-single-stage transless gird-connected inverter described in claim 1, it is characterised in that:
Including current sensor, first~tertiary voltage sensor, inductive current adjuster, gating circuit, absolute value counting circuit,
One~the second subtracter, the first~the second divider, adder, multiplier, the first~the 4th phase inverter, first~third compare
Device, the first~the second and door or door, the first~the 6th driving circuit；Current sensor samples the first filter inductance (Lf1) electricity
Stream obtains inductor current feedback signal iLf, the negative input end access i of the first subtracterLf, the positive input terminal access of the first subtracter
Inductive current reference signal iLr, the output end of the first subtracter is through inductive current adjuster and the first input end of adder company
It connects, the first DC capacitor of first voltage sensor sample (Cdc1) voltage obtain the first DC capacitor voltage feedback signal uCdc1f,
The positive input terminal of the first input end of first divider and the second subtracter is respectively connected to uCdc1f, second voltage sensor sample
Two DC capacitor (Cdc2) voltage obtain the second DC capacitor voltage feedback signal uCdc2f, the first input end of the second divider
Access uCdc2f, tertiary voltage sensor sample network voltage obtains network voltage feedback signal ugf, absolute value counting circuit it is defeated
Enter end, the second input terminal of the second input terminal of the first divider, the second divider is respectively connected to ugf, bearing for the second subtracter be defeated
Enter and terminates into DC bias signal uBias, the positive input terminal of the output end of the second subtracter and first comparator connects, the first ratio
Negative input end compared with device is connect with the output end of absolute value counting circuit, and the output end of first comparator is separately connected gating circuit
Third input terminal, first with the first input end of door and the input terminal of the 4th phase inverter, the output end of the 4th phase inverter and the
Two connect with the first input end of door, and the first input end of gating circuit accesses the output end signal u of the second dividergff1, choosing
Second input terminal of circuit passband accesses the output end signal u of the first dividergff2, the first input end access gating electricity of multiplier
The output end signal u on roadgff, the second input terminal access proportionality coefficient k of multiplier, the output end connection adder of multiplier
Second input terminal, the output end of adder are separately connected the positive input terminal of the second comparator and the input terminal of the first phase inverter, the
The positive input terminal of the output end connection third comparator of one phase inverter, the negative-phase input of the second comparator and third comparator
Negative-phase input is respectively connected to triangle carrier signal ust, the output end of the second comparator is separately connected the input of the second phase inverter
The input terminal of the first input end and the 4th driving circuit of end or door, and by the 4th driving the 4th power switch tube of circuit output
(S4) driving signal ugs4, the input terminal of output end the second driving circuit of connection of the second phase inverter, the output of the second driving circuit
Second power switch tube (S2) driving signal ugs2, the output end of third comparator be separately connected third phase inverter input terminal,
Or door the second input terminal and third driving circuit input terminal, third driving circuit export third power switch tube (S3) drive
Dynamic signal ugs3, the input terminal of output end the first driving circuit of connection of third phase inverter, the first driving circuit the first power of output
Switching tube (S1) driving signal ugs1Or the output end of door be separately connected first with the second input terminal of door and second with door
Second input terminal, first connect the input terminal of the 6th driving circuit with the output end of door, and the 6th driving circuit exports the 6th power
Switching tube (S6) driving signal ugs6, second connect the input terminal of the 5th driving circuit, the 5th driving circuit with the output end of door
Export the 5th power switch tube (S5) driving signal ugs5。
4. control circuit according to claim 3, it is characterised in that: the output signal of the first comparator is high level
When, the output end signal u of gating circuitgffEqual to the second input end signal ugff2；The output signal of the first comparator is low
When level, the output end signal u of gating circuitgffEqual to first input end signal ugff1。
5. control circuit according to claim 3, it is characterised in that: the amplitude and triangle carrier signal of the proportionality coefficient k
ustAmplitude it is equal；The DC bias signal uBiasGreater than zero.
6. a kind of quasi-single-stage transless gird-connected inverter, it is characterised in that: including dc power translation circuit (1 ') and full-bridge
Inverter circuit (2 ')；The full bridge inverter (2 ') includes the first power switch tube (S11), the second power switch tube (S12)、
Third power switch tube (S13), the 4th power switch tube (S14), the 5th power switch tube (S15), the 6th power switch tube (S16)、
Power diode (D11), the first DC capacitor (Cdc11), the second DC capacitor (Cdc12), the first filter inductance (Lf11), second filter
Wave inductance (Lf12) and ac filter capacitor (Cf1)；First DC capacitor (Cdc11) anode be separately connected the anode of photo-voltaic power supply
With power diode (D11) anode, the first DC capacitor (Cdc11) cathode be separately connected the cathode of photo-voltaic power supply, second straight
Galvanic electricity holds (Cdc12) cathode and the 6th power switch tube (S16) source electrode, the 6th power switch tube (S16) drain electrode be separately connected
Third power switch tube (S13) emitter and the 4th power switch tube (S14) emitter, the second DC capacitor (Cdc12) just
Pole connects the 5th power switch tube (S15) drain electrode, the 5th power switch tube (S15) source electrode be separately connected power diode
(D11) cathode, the first power switch tube (S11) drain electrode and the second power switch tube (S12) drain electrode, the first power switch tube
(S11) source electrode connect third power switch tube (S13) collector and the first filter inductance (Lf11) one end, the first filtered electrical
Feel (Lf11) the other end connect ac filter capacitor (Cf1) one end, ac filter capacitor (Cf1) the other end connection second filter
Wave inductance (Lf12) one end, the second filter inductance (Lf12) the other end be separately connected the second power switch tube (S12) source electrode and
4th power switch tube (S14) collector, ac filter capacitor (Cf1) both ends access power grid, dc power translation circuit
The anode of the first end connection photo-voltaic power supply of (1 '), the second end of dc power translation circuit (1 ') connect the second DC capacitor
(Cdc12) cathode, the third end of dc power translation circuit (1 ') connects the second DC capacitor (Cdc12) anode.
7. a kind of quasi-single-stage transless gird-connected inverter according to claim 6, it is characterised in that: the dc power becomes
Changing circuit (1 ') is boost conversion circuit, output voltage and input voltage same polarity, dc power translation circuit (1 ') control
Second DC capacitor (Cdc12) on voltage it is constant, and be higher than network voltage peak value.
8. a kind of control circuit, for controlling quasi-single-stage transless gird-connected inverter described in claim 6, it is characterised in that:
Including current sensor, first~tertiary voltage sensor, inductive current adjuster, gating circuit, absolute value counting circuit,
One~the second subtracter, the first~the second divider, adder, multiplier, the first~the 4th phase inverter, first~third compare
Device and door or door, the first~the 6th driving circuit；Current sensor samples the first filter inductance (Lf11) electric current obtain inductance
Current feedback signal iLf, the negative input end access i of the first subtracterLf, the positive input terminal access inductive current ginseng of the first subtracter
Examine signal iLr, the output end of the first subtracter is through inductive current adjuster and the connection of the first input end of adder, first voltage
The first DC capacitor of sensor sample (Cdc11) voltage obtain the first DC capacitor voltage feedback signal uCdc1f, the first divider
First input end access uCdc1f, the second DC capacitor of second voltage sensor sample (Cdc12) voltage obtain the second direct current
Hold voltage feedback signal uCdc2f, the u of the first input end access second voltage sensor output of the second dividerCdc2f, second subtracts
The u of the positive input terminal access first voltage sensor output of musical instruments used in a Buddhist or Taoist massCdc1f, the negative input end access direct current biasing letter of the second subtracter
Number uBias, the positive input terminal of the output end of the second subtracter and first comparator connects, the negative input end of first comparator and absolutely
Output end connection to value counting circuit, the output end of first comparator are separately connected the third input terminal and the 4th of gating circuit
The input terminal of phase inverter, the first input end of the output end connection and door of the 4th phase inverter, tertiary voltage sensor sample power grid
Voltage obtains network voltage feedback signal ugf, the input terminal of absolute value counting circuit, the second input terminal of the first divider, second
Second input terminal of divider is respectively connected to ugf, the output end signal of first input end the first divider of access of gating circuit
ugff1, the output end u of the second input terminal the second divider of access of gating circuitgff2, the first input end of multiplier, which accesses, to be gated
The output end signal u of circuitgff, the second input terminal access proportionality coefficient k of multiplier, the output end connection adder of multiplier
The second input terminal, the output end of adder is separately connected the positive input terminal of the second comparator and the input terminal of the first phase inverter,
The positive input terminal of the output end connection third comparator of first phase inverter, the negative-phase input and third comparator of the second comparator
Negative-phase input be respectively connected to triangle carrier signal ust, the output end of the second comparator is separately connected the input of the second phase inverter
The input terminal of the first input end and the 4th driving circuit of end or door, and by the 4th driving the 4th power switch tube of circuit output
(S14) driving signal ugs4, the input terminal of output end the second driving circuit of connection of the second phase inverter, the output of the second driving circuit
Second power switch tube (S12) driving signal ugs2, the output end of third comparator be separately connected third phase inverter input terminal,
Or door the second input terminal and third driving circuit input terminal, third driving circuit export third power switch tube (S13) drive
Dynamic signal ugs3, the input terminal of output end the first driving circuit of connection of third phase inverter, the first driving circuit the first power of output
Switching tube (S11) driving signal ugs1Or the input of the output end connection and the second input terminal and the 6th driving circuit of door of door
End, the 6th driving circuit export the 6th power switch tube (S16) driving signal ugs6, the 5th driving electricity is connect with the output end of door
The input terminal on road, the 5th driving circuit export the 5th power switch tube (S15) driving signal ugs5。
9. control circuit according to claim 8, it is characterised in that: the output signal of the first comparator is high level
When, the output end signal u of gating circuitgffEqual to first input end signal ugff1；The output signal of the first comparator is low
When level, the output end signal u of gating circuitgffEqual to the second input end signal ugff2。
10. control circuit according to claim 8, it is characterised in that: the amplitude and triangle carrier signal of the proportionality coefficient k
ustAmplitude it is equal；The DC bias signal uBiasGreater than zero.
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| CN110011560B (en) * | 2019-04-24 | 2020-04-21 | 河海大学 | Double-buck full-bridge grid-connected inverter with circulating current eliminating capability and control circuit thereof |
| CN111865132B (en) * | 2020-08-26 | 2024-02-09 | 阳光电源（上海）有限公司 | Single-phase inverter, inverter topology circuit and control method thereof |
| CN112421962B (en) * | 2020-11-03 | 2022-04-05 | 深圳第三代半导体研究院 | Two-stage DC-DC converter with partial power regulation function |
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