CN110350816A - A kind of single-stage and-phase current source inverter of energy storage inductor parallel connection Active Snubber Circuit - Google Patents
A kind of single-stage and-phase current source inverter of energy storage inductor parallel connection Active Snubber Circuit Download PDFInfo
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- CN110350816A CN110350816A CN201910642799.7A CN201910642799A CN110350816A CN 110350816 A CN110350816 A CN 110350816A CN 201910642799 A CN201910642799 A CN 201910642799A CN 110350816 A CN110350816 A CN 110350816A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 60
- 230000003139 buffering effect Effects 0.000 claims abstract description 37
- 239000003990 capacitor Substances 0.000 claims abstract description 35
- 230000005611 electricity Effects 0.000 claims description 16
- 239000000872 buffer Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000006641 stabilisation Effects 0.000 abstract description 4
- 238000011105 stabilization Methods 0.000 abstract description 4
- 230000001172 regenerating effect Effects 0.000 description 25
- 238000001914 filtration Methods 0.000 description 12
- 230000009466 transformation Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 3
- 230000006837 decompression Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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- H02J3/385—
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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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
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- Engineering & Computer Science (AREA)
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- Inverter Devices (AREA)
Abstract
The present invention relates to power electronics fields, especially a kind of single-stage and-phase current source inverter of energy storage inductor parallel connection Active Snubber Circuit, including successively cascade energy storage inductor, half-bridge converter and output filter, the energy storage inductor both ends parallel connection Active Snubber Circuit, the Active Snubber Circuit includes a buffering capacitor, two diodes and two full-control type power switch, and the half-bridge converter is mainly made of four full-control type power switch.The inverter can by unstable, low amplitude value, poor quality DC power conversion at stabilization, amplitude, good single-phase output sinusoidal ac, be suitable for boosting, Small And Medium Capacity single phase passive and parallel network reverse occasion.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of single-stage of energy storage inductor parallel connection Active Snubber Circuit
Single-phase electricity flow pattern inverter.
Background technique
Inverter is using a kind of static ac dc converter device of the power semiconductor by DC power conversion at alternating current, for handing over
Current load is used or is generated electricity by way of merging two or more grid systems with public electric wire net.
Due to the fossil energies such as petroleum, coal and natural gas (non-renewable energy resources) growing tension, environmental pollution is serious, the whole world
It warms, nuclear energy production can generate reasons, the energy and the environment such as nuke rubbish and pollution environment and have become what the 21 century mankind were faced
Significant problem.The renewable energy such as solar energy, wind energy, tide energy and geothermal energy (green energy resource) have cleanliness without any pollution, honest and clean
Valence, it is reliable, abundant the advantages that, develop and utilize renewable energy and be increasingly valued by people, this is to countries in the world economy
Sustainable development have considerable meaning.The renewable energy conversions such as solar energy, wind energy, Hydrogen Energy, tide energy, geothermal energy
Direct current energy be usually it is unstable, need using inverter be converted into AC energy supply load use or and common electrical
Net generates electricity by way of merging two or more grid systems.With dc generator, battery, solar battery, fuel cell, wind energy conversion system etc. for the inverse of main dc power supply
Variable field is closed, and inverter is with a wide range of applications.
At present in the inversion occasion of Small And Medium Capacity, single-stage and-phase voltage-type (voltage-dropping type) inverter circuit knot is generallyd use
Structure.This kind of inverter must satisfy the peak value that DC voltage is greater than exchange side phase voltage when working normally, therefore bright there are one
Aobvious defect: when DC voltage (such as photovoltaic cell fan-out capability) reduces, such as rainy days or night, entire electricity generation system will
It is out of service, the utilization rate decline of system.In this regard, solved the problems, such as frequently with the following two kinds method this-: (1) prime adds
Boost type DC converter, thus constitute two stage power transformation circuit structure, increase circuit complexity, loss and at
This；(2) output plus single phase industrial frequence transformer are particularly difficult to adapt to copper to considerably increase the volume of system, weight and cost
Today that the iron prices of raw materials are risen sharply.
Therefore, it is extremely urgent to seek a kind of booster type single-phase inverter with single stage circuit structure.
Summary of the invention
The purpose of the present invention is to provide a kind of single-stage and-phase current mode inversions of energy storage inductor parallel connection Active Snubber Circuit
Device, the inverter can by unstable, low amplitude value, poor quality DC power conversion at stabilization, amplitude, good single-phase output just
String alternating current.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of energy storage inductor parallel connection Active Snubber Circuit
Single-stage and-phase current source inverter, including successively cascade energy storage inductor, half-bridge converter and output filter, the energy storage electricity
Feel both ends parallel connection Active Snubber Circuit, the Active Snubber Circuit includes a buffering capacitor, two diodes and two full controls
Type power switch, the half-bridge converter are mainly made of four full-control type power switch.
Further, two full-control type power switch of the Active Snubber Circuit be able to bear bi-directional voltage stress and
Two quadrant power switch of monophase current stress.
Further, two full-control type power switch of the Active Snubber Circuit be able to bear unidirectional voltage stress and
Two quadrant power switch of bidirectional current stress.
Further, the Active Snubber Circuit includes the 5th power switchS 5, the 6th power switchS 6, the 5th diodeD 5, the 6th diodeD 6With buffering capacitorC b , the 5th power switchS 5Drain electrode, the 5th diodeD 5Cathode with buffering
CapacitorC b One end be connected, the 6th power switchS 6Source electrode, the 6th diodeD 6Anode with buffering capacitorC b The other end
It is connected, the 5th power switchS 5Source electrode and the 6th diodeD 6Cathode be connected, the 6th power switchS 6Drain electrode and the five or two
Pole pipeD 5Anode be connected.
Further, the energy storage inductorLOne end and the 5th power switchS 5Source electrode, the 6th diodeD 6's
Cathode is connected, the energy storage inductorLThe other end and the 6th power switchS 6Drain electrode, the 5th diodeD 5Anode phase
Even.
The present invention " will sequentially cascade the traditional single stage single-phase electricity die mould constituted by half-bridge converter and single-phase LC filter
(voltage-dropping type) inverter circuit structure " is changed to " by the energy storage inductor, half-bridge converter and output of both ends parallel connection Active Snubber Circuit
Filter sequentially cascades single-stage and-phase current mode (booster type) circuit structure of composition ", it has been put forward for the first time energy storage inductor and has been parallel with
The new concept and circuit structure of single-stage and-phase current mode (booster type) inverter of source buffer circuit, i.e., by input voltage sourceU i 、
Energy storage inductorLWith the first power switch of inverter bridgeS 1With third power switchS 3(or the second power switchS 2It is opened with the 4th power
It closesS 4) constitute circuit of magnetizing；By input voltage sourceU i , energy storage inductorL、First power switch of inverter bridgeS 1It is opened with the 4th power
It closesS 4(or the second power switchS 2With third power switchS 3), output filter and load constitute energy regenerative circuit；By energy storage electricity
SenseL, the 5th diodeD 5, the 6th diodeD 6With buffering capacitorC b Constitute buffering capacitor charging circuit；By energy storage inductorL, the 5th
Power switchS 5, the 6th power switchS 6With buffering capacitorC b Constitute buffering capacitor discharge loop.Pass through circuit and the energy regenerative time of magnetizing
The voltage transformation of road realization inverter boost phase；The voltage of inverter buck stage is realized by charge circuit and energy regenerative circuit
Transformation；Contravarianter voltage transformation and buffering capacitor excess energy release are realized by discharge loop and energy regenerative circuit.
It compared with prior art, the invention has the following advantages: can be by the direct current of unstable, low amplitude value, poor quality
Electricity is transformed into stabilization, amplitude, good single-phase output sinusoidal ac, have the transformation of single-stage boost power, power density it is high,
Conversion efficiency is high, the output waveform distortion factor is low, overload and high reliablity when short circuit, the advantages that lifetime of system is long, at low cost, is applicable in
In boosting, Small And Medium Capacity single phase passive and parallel network reverse occasion, especially suitable for photovoltaic, wind generator system whole process luminous energy, wind
It can be controlled using with MPPT maximum power point tracking.With the two-way appearance for blocking the new devices such as IGBT, this inverter is no longer
Required series diode, solves the problems, such as the loss of series diode, more shows its unique advantage, has very strong practical
Property and wide application prospect.
Detailed description of the invention
Fig. 1 is the circuit structure of the embodiment of the present invention.
Fig. 2 is that the single-stage and-phase current source inverter of the embodiment of the present invention is in energy storage inductor and magnetizes the equivalent electricity of mode
Road.
Fig. 3 is that the single-stage and-phase current source inverter of the embodiment of the present invention is in the equivalent electricity of buffering capacitor electric discharge mode
Road.
Fig. 4 is that the single-stage and-phase current source inverter of the embodiment of the present invention is in the equivalent electricity of buffering capacitor charging mode
Road.
Fig. 5 is that the single-stage and-phase current source inverter of the embodiment of the present invention is in the equivalent of inverter bridge positive half cycle energy regenerative mode
Circuit.
Fig. 6 is that the single-stage and-phase current source inverter of the embodiment of the present invention is in the equivalent of inverter bridge negative half period energy regenerative mode
Circuit.
Fig. 7 is the circuit topology of the single-stage and-phase current source inverter single order C filtering of the embodiment of the present invention.
Fig. 8 is the circuit topology of the single-stage and-phase current source inverter second order CL filtering of the embodiment of the present invention.
Output voltage feedback control plan when Fig. 9 is the single-stage and-phase current source inverter off-network inversion of the embodiment of the present invention
Slightly.
Principle waveform when Figure 10 is the single-stage and-phase current source inverter off-network inversion of the embodiment of the present invention.
Energy storage inductor magnetizes mode when Figure 11 is the single-stage and-phase current source inverter single order C filtering of the embodiment of the present invention
Switch equivalent circuit.
Buffering capacitor electric discharge mode when Figure 12 is the single-stage and-phase current source inverter single order C filtering of the embodiment of the present invention
Switch equivalent circuit.
Figure 13 buffers capacitor charging mode when being the single-stage and-phase current source inverter single order C filtering of the embodiment of the present invention
Switch equivalent circuit.
Inverter bridge positive half cycle energy regenerative mould when Figure 14 is the single-stage and-phase current source inverter single order C filtering of the embodiment of the present invention
The switch equivalent circuit of state.
Inverter bridge negative half period energy regenerative mould when Figure 15 is the single-stage and-phase current source inverter single order C filtering of the embodiment of the present invention
The switch equivalent circuit of state.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment, the present invention is described in further details.
As shown in Figure 1, the present invention provides a kind of single-stage and-phase current mode of energy storage inductor parallel connection Active Snubber Circuit is inverse
Become device, including successively cascade energy storage inductor, half-bridge converter and output filter, the energy storage inductor both ends are in parallel active slow
Circuit is rushed, the Active Snubber Circuit includes a buffering capacitor, two diodes and two full-control type power switch, the list
Phase inverter bridge is mainly made of four full-control type power switch.
Wherein, two full-control type power switch of the Active Snubber Circuit can be able to bear bi-directional voltage stress and
Two quadrant power switch of monophase current stress, or be able to bear the two of unidirectional voltage stress and bidirectional current stress as
Limit power switch.
In the present embodiment, the Active Snubber Circuit includes the 5th power switchS 5, the 6th power switchS 6, the five or two
Pole pipeD 5, the 6th diodeD 6With buffering capacitorC b , the 5th power switchS 5Drain electrode, the 5th diodeD 5Cathode with
Buffer capacitorC b One end be connected, the 6th power switchS 6Source electrode, the 6th diodeD 6Anode with buffering capacitorC b It is another
One end is connected, the 5th power switchS 5Source electrode and the 6th diodeD 6Cathode be connected, the 6th power switchS 6Drain electrode and
Five diodesD 5Anode be connected.The energy storage inductorLOne end and the 5th power switchS 5Source electrode, the 6th diodeD 6Cathode be connected, the energy storage inductorLThe other end and the 6th power switchS 6Drain electrode, the 5th diodeD 5Sun
Extremely it is connected.
Present invention firstly provides single-stage and-phase current mode (booster type) inversions of energy storage inductor parallel connection Active Snubber Circuit
The new concept and circuit structure of device, i.e., by input voltage sourceU i , energy storage inductorLWith the first power switch of inverter bridgeS 1And third
Power switchS 3(or the second power switchS 2With the 4th power switchS 4) constitute circuit of magnetizing；By input voltage sourceU i , energy storage electricity
SenseL、First power switch of inverter bridgeS 1With the 4th power switchS 4(or the second power switchS 2With third power switchS 3),
Output filter and load constitute energy regenerative circuit；By energy storage inductorL, the 5th diodeD 5, the 6th diodeD 6With buffering capacitorC b Constitute buffering capacitor charging circuit；By energy storage inductorL, the 5th power switchS 5, the 6th power switchS 6With buffering capacitorC b Structure
At buffering capacitor discharge loop.Pass through the voltage transformation in magnetize circuit and energy regenerative circuit realization inverter boost phase；By filling
The voltage transformation of inverter buck stage is realized in electrical circuit and energy regenerative circuit；Inverter is realized by discharge loop and energy regenerative circuit
Voltage transformation and buffering capacitor excess energy release.
In Fig. 1,U i For input direct-current voltage source, energy storage inductorLIt is converted for inversion boosting, in parallel active of energy storage inductor
Buffer circuit (byD 5、D 6、S 5、S 6WithC b Constitute) for buffering input direct-current voltage sourceU i , energy storage inductorLPower swing, with
Achieve the purpose that system input, output energy balance in the entire low frequency output period；Single phase filter is defeated for filtering out inverter
The high-frequency ripple components of side voltage, electric current out, to ensure the output waveform quality of inverter；Z L For the negative of inverter off-grid operation
Impedance is carried,u n For the single phase ac power grid voltage of grid-connected inverters operation.
In the present embodiment, the single-stage and-phase current source inverter tool of energy storage inductor parallel connection Active Snubber Circuit of the invention
There are five types of circuit mode and three kinds of operating modes, specific as follows:
There are energy storage inductors to magnetize mode, buffering capacitor electric discharge mode, buffering capacitor charging mode, inverter bridge just for the inverter
Half cycle energy regenerative mode and inverter bridge negative half period energy regenerative mode totally five kinds of circuit mode, equivalent circuit is respectively such as Fig. 2,3,4,5,6
It is shown.
The inverter is in a low frequency output cycle memory in three kinds of operating modes, i.e. energy storage inductor current instantaneous valuei L
Less than energy storage inductor current limit valueI L *, and buffer capacitance voltage instantaneous valueu Cb Less than buffering capacitance voltage limit valueU Cb *When,
Inverter is in the boost mode that magnetizes；Energy storage inductor current instantaneous valuei L Less than energy storage inductor current limit valueI L *, and buffer electricity
Hold instantaneous voltageu Cb Greater than buffering capacitance voltage limit valueU Cb *When, inverter is in electric discharge boost mode；Energy storage inductor electric current
Instantaneous valuei L Greater than energy storage inductor current limit valueI L *When, inverter is in charging decompression mode.
Wherein, the inverter magnetizes boost mode are as follows: i L < I L *Andu Cb <U Cb *Each HF switch period in,
Inverter works during DTs, byU i 、LAndS 1WithS 3(orS 2WithS 4) constitute circuit pairLThe energy storage inductor to magnetize fills
Magnetic mode；During (1-D) Ts, byU i 、LAndS 1WithS 4(orS 2WithS 3) constitute circuit to load carry out energy regenerative inversion
Positive (or negative) the half cycle energy regenerative mode of bridge.
Wherein, the inverter electric discharge boost mode are as follows: i L < I L *Andu Cb >U Cb *Each HF switch period in,
Inverter works during DTs, byL、C b AndS 5WithS 6The circuit pair of compositionCCarry out electric discharge and it is rightLThe buffering electricity to magnetize
Discharge capacitor mode；During (1-D) Ts, byU i 、LAndS 1WithS 4(orS 2WithS 3) circuit that constitutes carries out energy regenerative to load
Positive (or negative) the half cycle energy regenerative mode of inverter bridge.
Wherein, the inverter charging decompression mode are as follows: i L > I L *Each HF switch period in, inverter work
Make during DTs, byL、C b AndD 5WithD 6The circuit pair of compositionCCarry out charging and it is rightLCarry out the buffering capacitor charging mould of degaussing
State；During (1-D) Ts, byU i 、LAndS 1WithS 4(orS 2WithS 3) constitute circuit to load carry out energy regenerative inverter bridge just
(or negative) half cycle energy regenerative mode.
Above-mentioned three kinds of operating modes are all that energy storage inductor current inversion is modulated electric current at tri-state by half-bridge converteri m ,
The single-phase sinusoidal voltage of high quality is obtained in single phase ac load after single-phase filteringu n Or it is online in single-phase alternating current
Obtain the single-phase simple sinusoidal alternating current of high qualityi n 。
The present invention solves traditional single stage single phase boost type PWM inverter energy storage inductor during decompression and can not release and can lead
Therefore the problems such as causing magnetic saturation and output waveform to distort has single-stage boosting inverter, conversion efficiency height (means that energy damages
Consume small), power density high (meaning that volume, weight are small), the advantages that input voltage range is wide, at low cost, application prospect is extensive,
It is a kind of ideal energy-saving type single-phase inverter, new method is provided for the distributed power generation of renewable energy, energetically
It advocates construction and has more important value energy-saving, conservation-minded society today.
In the present embodiment, the single phase filter is single order C filter or second order CL filter, is mainly used for filtering out inverse
Become the current ripples of bridge outlet side.The case where being filtered using single order C, suitable for the inversion less high to output waveform quality requirement
Occasion；The case where being filtered using second order CL, suitable for the inversion occasion high to output waveform quality requirement.The present embodiment also provides
Filtered using single order C and using second order CL filtering two kinds of physical circuit topologys, as shown in Figure 7,8.
The inverter can be by a kind of unstable low-voltage DC (such as battery, photovoltaic cell, fuel cell, wind-force
Machine etc.) it is transformed into required stabilization, high-quality, high pressure, single-phase sinusoidal ac, it is widely used in Small And Medium Capacity, boosting occasion
Civilian industry inverter is (such as communication inverter and photovoltaic combining inverter 24VDC/220V50HzAC, 24VDC/
110V60HzAC, 48VDC/220V50HzAC, 48VDC/110V60HzAC) and (the static change of such as aviation of national defense industry inverter
Flow device 27VDC/115V400HzAC) etc..
The present invention can be using the off-network control strategy of output voltage feedback, and the cutting-in control plan of output current feedback
Slightly.To use the single-stage and-phase current source inverter off-network of the energy storage inductor parallel connection Active Snubber Circuit of single order C filtering shown in Fig. 7
In case where work, output voltage feedback control strategy is as shown in figure 9, control principle waveform is as shown in Figure 10.
As shown in Figure 9, the single-stage and-phase current source inverter off-network work of the energy storage inductor parallel connection Active Snubber Circuit
When, circuit is provided with the limit value of buffering capacitance voltageU Cb *, energy storage inductor current limit valueI L *With inverter output voltage benchmark
Valueu ref , systematic sampling simultaneously feeds back buffering capacitance voltageu Cb , energy storage inductor electric currenti L And inverter output voltageu n , by appropriate
Logical relation obtainS 1~S 6Driving signal, achieved the purpose that acquisition control principle waveform as shown in Figure 10.
According to the control strategy of Fig. 9, the single-stage and-phase current source inverter of energy storage inductor parallel connection Active Snubber Circuit is normal
When work there are energy storage inductor magnetize mode, buffering capacitor electric discharge mode, buffering capacitor charging mode, inverter bridge positive half cycle energy regenerative
Mode and inverter bridge negative half period energy regenerative mode totally five kinds of circuit mode, switch equivalent circuit is respectively such as Figure 11,12,13,14,15
Shown, heavy line indicates the path of current flowing in figure.
Since the corresponding circuit working state of output voltage positive-negative half-cycle is symmetrically, to be exported here with inverter work
Voltage positive half cycle isu n In case where > 0, inverter operation principle is introduced:
When the quantity of state in circuit meetsi L < I L *Andu Cb <U Cb *When, inverter work is in the DTs phase in each HF switch period
Between energy storage inductor magnetize inverter bridge positive half cycle energy regenerative mode during mode, and (1-D) Ts, switch equivalent circuit is respectively as schemed
11, shown in 14.
When the quantity of state in circuit meetsi L < I L *Andu Cb >U Cb *When, inverter work exists in each HF switch period
Inverter bridge positive half cycle energy regenerative mode, switch equivalent circuit are distinguished during buffering capacitor electric discharge mode, and (1-D) Ts during DTs
As shown in Figure 12,14.
When the quantity of state in circuit meetsi L > I L *When, inverter work is delayed during DTs in each HF switch period
Inverter bridge positive half cycle energy regenerative mode during capacitor charging mode, and (1-D) Ts is rushed, switch equivalent circuit is respectively such as Figure 13,14
It is shown.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (5)
1. a kind of single-stage and-phase current source inverter of energy storage inductor parallel connection Active Snubber Circuit, which is characterized in that including successively
Cascade energy storage inductor, half-bridge converter and output filter, the energy storage inductor both ends parallel connection Active Snubber Circuit are described to have
Source buffer circuit includes that a buffering capacitor, two diodes and two full-control type power switch, the half-bridge converter are main
It is made of four full-control type power switch.
2. a kind of single-stage and-phase current source inverter of energy storage inductor parallel connection Active Snubber Circuit according to claim 1,
It is characterized in that, two full-control type power switch of the Active Snubber Circuit are to be able to bear bi-directional voltage stress and single-phase electricity
Flow two quadrant power switch of stress.
3. a kind of single-stage and-phase current source inverter of energy storage inductor parallel connection Active Snubber Circuit according to claim 1,
It is characterized in that, two full-control type power switch of the Active Snubber Circuit are to be able to bear unidirectional voltage stress and two-way electricity
Flow two quadrant power switch of stress.
4. a kind of single-stage and-phase current source inverter of energy storage inductor parallel connection Active Snubber Circuit according to claim 1,
It is characterized in that, the Active Snubber Circuit includes the 5th power switchS 5, the 6th power switchS 6, the 5th diodeD 5, the 6th
DiodeD 6With buffering capacitorC b , the 5th power switchS 5Drain electrode, the 5th diodeD 5Cathode with buffering capacitorC b
One end be connected, the 6th power switchS 6Source electrode, the 6th diodeD 6Anode with buffering capacitorC b The other end be connected,
5th power switchS 5Source electrode and the 6th diodeD 6Cathode be connected, the 6th power switchS 6Drain electrode and the 5th diodeD 5Anode be connected.
5. a kind of single-stage and-phase current source inverter of energy storage inductor parallel connection Active Snubber Circuit according to claim 4,
It is characterized in that, the energy storage inductorLOne end and the 5th power switchS 5Source electrode, the 6th diodeD 6Cathode phase
Even, the energy storage inductorLThe other end and the 6th power switchS 6Drain electrode, the 5th diodeD 5Anode be connected.
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