CN108155824A - The series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input - Google Patents

The series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input Download PDF

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Publication number
CN108155824A
CN108155824A CN201810020146.0A CN201810020146A CN108155824A CN 108155824 A CN108155824 A CN 108155824A CN 201810020146 A CN201810020146 A CN 201810020146A CN 108155824 A CN108155824 A CN 108155824A
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output
input
power
simultaneous selection
inverter
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陈道炼
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Qingdao University
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Qingdao University
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H02J3/382
    • H02J3/385
    • H02J3/386
    • H02J3/387
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/0083Converters characterised by their input or output configuration
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The present invention relates to a kind of series connection non-isolated inverters of simultaneous selection switching voltage type single-stage multi input, its circuit structure is the multiple input single output high-frequency inverter circuit that has series connection simultaneous selection power switch by one, and the input filter on ground and a shared output filter connection are formed altogether by multiple not, each input terminal of multiple input single output high-frequency inverter circuit couples with the output terminal of each input filter one-to-one correspondence, and the output terminal of multiple input single output high-frequency inverter circuit and the input terminal of output filter are connected.This inverter have the characteristics that multiple input sources not altogether while or time sharing power supply, output and input be not isolated from, share that output filter, circuit topology are succinct, single-stage power conversion, power density are high, conversion efficiency is high, output voltage ripple is small, application prospect is extensive, the large-capacity distributing electric power system to realize a variety of new energy joint power supplies has established key technology.

Description

The series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input
Technical field
The series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input according to the present invention, belongs to electric power electricity Sub- converter technique.
Background technology
Inverter is to be transformed into a kind of unstable, inferior direct current energy using power semiconductor stablize, is high-quality AC energy static ac dc converter device, for AC load use or realize exchange it is grid-connected.Export AC load or AC network There are electrical isolation, the inverter without electrical isolation between input DC power, be referred to as isolated form, non-isolation type inverter. Non-isolation type inverter has the characteristics that circuit structure is succinct, reliability is high, output capacity is big, at low cost, with DC generation Machine, accumulator, photovoltaic cell and fuel cell etc. apply valency for the secondary transformation of electrical energy occasion of main dc power supply with important Value.
The new energy such as solar energy, wind energy, tide energy and geothermal energy (also referred to as green energy resource) have cleanliness without any pollution, honest and clean Valency, it is reliable, abundant the advantages that, thus be with a wide range of applications.Due to traditional fossil energies such as oil, coal and natural gases (the non-renewable energy) growing tension, environmental pollution is serious, causes global warming and the production of nuclear energy that can generate core again gives up Reasons, the development and utilization of new energy such as material and pollution environment are increasingly valued by people.Generation of electricity by new energy mainly has light The types such as volt, wind-force, fuel cell, waterpower, underground heat, there are supply of electric power it is unstable, it is discontinuous, with weather conditions variation etc. Defect, it is therefore desirable to using the distributed power supply system of a variety of new energy joint power supply.
Traditional new energy distributed power supply system, as shown in Figure 1, 2.The system is typically to use multiple single input direct currents Photovoltaic cell, fuel cell, wind-driven generator etc. are not required to the new energy equipment of energy stores respectively by one by converter A Unidirectional direct-current converter carries out transformation of electrical energy and is connected to the direct current mother of public inverter afterwards in parallel or series in output terminal On line, it is intended to ensure the power supply of various new energy joint and being capable of co-ordination.The distributed generation system realizes multiple defeated Enter the preferential utilization that source is powered to the load simultaneously with the energy, improve stability and the flexibility of system, but there are two stage powers Transformation, the defects of power density is low, conversion efficiency is low, of high cost, the practicality, which receives, significantly to be limited.
In order to simplify circuit structure and reduce power conversion series, need new with single stage circuit structure shown in Fig. 3 Type multi input inverter replaces Fig. 1,2 shown traditional multi inputs with DC converter with inverter two-stage cascade circuit structure Inverter forms novel single-stage new energy distributed power supply system.Single-stage multi input inverter allows a variety of new energy to input, Property, amplitude and the characteristic of input source can be identical, can also difference it is very big.Novel single-stage new energy distributed power supply system With circuit structure is succinct, single-stage power conversion, multiple input source is simultaneously in a HF switch period or timesharing is supplied to load The advantages that electric, at low cost.
Therefore, actively seek a kind of single-stage multi input inverter that a variety of new energy is allowed to combine power supply and its new energy point Cloth electric power system is extremely urgent, for improving stability and the flexibility of system, realizes that the preferential of new energy utilizes or fill Divide utilization that will have a very important significance.
Invention content
The invention aims to provide it is a kind of have the power supply of a variety of new energy joint, input DC power not altogether, it is how defeated Enter be not isolated between single output high-frequency inverter circuit setting series connection simultaneous selection switch, output and input, multiple input power supply it is same When or timesharing powers to the load, circuit topology is succinct, it is high to share output filter, single-stage power conversion, conversion efficiency, output electricity Emboss wave is small, the features such as output capacity is big, application prospect is extensive series connection simultaneous selection switching voltage type single-stage multi input it is non-every From inverter.
Technical program of the present invention lies in:A kind of series connection non-isolated inversion of simultaneous selection switching voltage type single-stage multi input Device is that the input filter on ground and a shared output are filtered altogether by multiple not by a multiple input single output high-frequency inverter circuit The connection of wave device is formed, and each input terminal of multiple input single output high-frequency inverter circuit and the output terminal of each input filter are one by one Corresponding connection, the output terminal of multiple input single output high-frequency inverter circuit and the input terminal of the output filter are connected, institute It is multiple series series simultaneous selection power switch circuit that the multiple input single output high-frequency inverter circuit stated forward is connected by output terminal, double Composition is sequentially cascaded to power flow single-input single-output high-frequency inverter circuit, is equivalent to a bidirectional power flow list at any time The single output high-frequency inverter circuit of input, it is described to be opened per series connection simultaneous selection power switch circuit all the way by a two quadrant power Close and the source electrode of power diode composition and two quadrant power switch be connected with the cathode of power diode, described two as The drain electrode of limit power switch and the anode of power diode are respectively the positive and negative electrode of road series connection simultaneous selection power switch circuit Property input terminal, the source electrode of the two quadrants power switch and the anode of power diode are respectively road series connection simultaneous selection power The positive and negative polarity output terminal of switching circuit;The output filter is made of output inductor or by output filtered electrical Sense, output filter capacitor sequentially cascade composition or by output inductor, output filter capacitor, output inductor sequentially grades Connection is formed.
The present invention is to form the DC converter of a variety of new energy joint electric power systems of tradition with inverter two-stage cascade Multi input inverter circuit structure, be configured to the single-stage multi input inverter circuit structure of novel series connection simultaneous selection switch, Propose the series connection simultaneous selection non-isolated inverter circuit structure of switching voltage type single-stage multi input and topological race and its energy pipe Control strategy is managed, i.e. the circuit structure is high by providing a kind of multiple input single output with series connection simultaneous selection power switch The input filter on ground and a shared output filter couple frequency inverter circuit altogether by multiple not.
The non-isolated inverter of series connection simultaneous selection switching voltage type single-stage multi input of the present invention multiple can not will be total to Ground, unstable input direct-current voltage, which are reverse into needed for a load, stablizes good output alternating current, straight with multi input Galvanic electricity source is not isolated from altogether, between multiple input single output high-frequency inverter circuit, export be not isolated from input, multi input power supply it is same When or timesharing powers to the load, circuit topology is succinct, it is high to share output filter, single-stage power conversion, conversion efficiency, output electricity Emboss the features such as wave is small, output capacity is big, application prospect is extensive.Simultaneous selection switching voltage type single-stage multi input of connecting is non-isolated The comprehensive performance of inverter, will be more superior than traditional DC converter and multi input inverter that inverter two-stage cascade forms.
Description of the drawings
Fig. 1, the two-stage type new energy distributed power supply system of traditional multiple Unidirectional direct-current converter output terminal parallel connections.
Fig. 2, the two-stage type new energy distributed power supply system of traditional multiple Unidirectional direct-current converter output terminals series connection.
Fig. 3, novel single-stage multi input inverter principle block diagram.
Fig. 4, the non-isolated inverter principle block diagram of simultaneous selection switching voltage type single-stage multi input of connecting.
Fig. 5, the non-isolated inverter circuit structure chart of simultaneous selection switching voltage type single-stage multi input of connecting.
Fig. 6, the non-isolated inverter stable state of bipolar SPWM control series connection simultaneous selection switching voltage type single-stage multi input are former Manage oscillogram.
Fig. 7, the non-isolated inverter stable state of Unipolar SPWM control series connection simultaneous selection switching voltage type single-stage multi input are former Manage oscillogram.
Fig. 8, the non-isolated inverter circuit topology example one of simultaneous selection switching voltage type single-stage multi input of connecting ----half Bridge circuit schematic diagram I.
Fig. 9, the non-isolated inverter circuit topology example two of simultaneous selection switching voltage type single-stage multi input of connecting ----half Bridge circuit schematic diagram II.
Figure 10, the non-isolated inverter circuit topology example three of simultaneous selection switching voltage type single-stage multi input of connecting ----half Bridge circuit schematic diagram III.
Figure 11, the non-isolated inverter circuit topology example four of simultaneous selection switching voltage type single-stage multi input of connecting ----complete Bridge circuit schematic diagram I.
Figure 12, the non-isolated inverter circuit topology example five of simultaneous selection switching voltage type single-stage multi input of connecting ----complete Bridge circuit schematic diagram II.
Figure 13, the non-isolated inverter circuit topology example six of simultaneous selection switching voltage type single-stage multi input of connecting ----complete Bridge circuit schematic diagram III.
Figure 14, output voltage, the input current of the non-isolated inverter of simultaneous selection switching voltage type single-stage multi input of connecting Instantaneous values feedback bipolar SPWM principal and subordinate's power distribution energy management control block diagram.
Figure 15, output voltage, the input current of the non-isolated inverter of simultaneous selection switching voltage type single-stage multi input of connecting Instantaneous values feedback bipolar SPWM principal and subordinate's power distribution energy management control principle oscillogram.
Figure 16, output voltage, the input current of the non-isolated inverter of simultaneous selection switching voltage type single-stage multi input of connecting Instantaneous values feedback Unipolar SPWM principal and subordinate's power distribution energy management control block diagram.
Figure 17, output voltage, the input current of the non-isolated inverter of simultaneous selection switching voltage type single-stage multi input of connecting Instantaneous values feedback Unipolar SPWM principal and subordinate's power distribution energy management control principle oscillogram.
Figure 18 has output terminal and connects the series connection simultaneous selection switching voltage type list of single-stage isolated Bidirectional charging-discharging converter The grade non-isolated autonomous power supply system of multi input.
Figure 19 has the maximum power output energy of single-stage isolated Bidirectional charging-discharging converter output voltage separate control loop Measure management and controlling tactics.
Figure 20, the output voltage u of autonomous power supply systemoWith output inductor electric current iLf、iLf' waveform.
Specific embodiment
With reference to the accompanying drawings of the specification and embodiment is described further technical scheme of the present invention.
The series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input, is by a multiple input single output high frequency The input filter on ground and a shared output filter couple and form inverter circuit altogether by multiple not, and multiple input single output is high Each input terminal of frequency inverter circuit couples with the output terminal of each input filter one-to-one correspondence, and multiple input single output high frequency is inverse The input terminal for becoming the output terminal and the output filter of circuit is connected, the multiple input single output high-frequency inverter circuit Multiple series series simultaneous selection power switch circuit, the bidirectional power flow single-input single-output high-frequency inversion forward connected by output terminal Circuit sequentially cascades composition, is equivalent to a bidirectional power flow single-input single-output high-frequency inverter circuit at any time, described It is made of per series connection simultaneous selection power switch circuit all the way a two quadrant power switch and a power diode and two The source electrode of quadrant power switch is connected with the cathode of power diode, two pole of drain electrode and power of the two quadrants power switch The anode of pipe is respectively the positive and negative polarity input terminal of road series connection simultaneous selection power switch circuit, and the two quadrants power is opened The source electrode of pass and the anode of power diode are respectively the positive and negative polarity output of road series connection simultaneous selection power switch circuit End;The output filter is made of output inductor or sequentially cascades structure by output inductor, output filter capacitor It sequentially cascades and forms into or by output inductor, output filter capacitor, output inductor.
It connects the functional block diagram of the non-isolated inverter of simultaneous selection switching voltage type single-stage multi input, circuit structure, bipolar Property SPWM control and Unipolar SPWM control inverter steady principle waveform, respectively as shown in FIG. 4,5,6, 7.Fig. 4,5,6,7 In, Ui1、Ui2、…、UinFor n roads input direct-current voltage source (n is the natural number more than 1), ZLIt is loaded for single phase ac (including nothing Source AC load and active ac load), uo、ioRespectively single-phase output alternating voltage and alternating current.The single output of n inputs is high Frequency inverter circuit is multiple series series simultaneous selection power switch circuit, the bidirectional power flow single input list forward connected by output terminal Output high-frequency inverter circuit sequentially cascades composition, the multiple series series simultaneous selection power switch circuit that wherein output terminal is forward connected It is the two quadrant high frequency power selecting switch S that can bear unidirectional voltage stress and bidirectional current stress by ns1、Ss2、…、SsnAnd N selection diode Ds1、Ds2、…、DsnForm (power selector switch Ss1、Ss2、…、SsnIt opens simultaneously or has that phase difference is open-minded, Switching frequency is identical or different, only analyzes S heres1、Ss2、…、SsnUsing same switch frequency and the controlling party opened simultaneously Formula), bidirectional power flow single-input single-output high-frequency inverter circuit is to bear unidirectional voltage stress, bidirectional current stress by multiple Two quadrant high frequency powers switch form, MOSFET, IGBT, GTR constant power device can be selected;(" A " is held and " B " end in dashed box For union end) output filter be made of output inductor or sequentially cascaded by output inductor, output filter capacitor It forms or is sequentially cascaded and formed by output inductor, output filter capacitor, output inductor, outputting inductance, capacitor filtering Device is suitable for passive AC load, and outputting inductance wave filter or outputting inductance, capacitance, inductance filter are born suitable for AC network It carries;N roads input filter is LC wave filters (the filter inductance L of the dashed box containing additioni1、Li2、…、Lin) or capacitive filter (be free of Add the filter inductance L of dashed boxi1、Li2、…、Lin), it can be smoother using n roads input direct-current electric current during LC wave filters.N inputs are single High-frequency inverter circuit is exported by n roads input direct-current voltage source Ui1、Ui2、…、UinAmplitude is modulated into input power supply number variation Bipolarity binary states or unipolarity tri-state multilevel SPWM voltage wave uAB, through output inductor Lf, output filter capacitor Cf The sinusoidal voltage u of high quality is obtained on single phase ac passive load afterwardsoOr through output inductor LfOr output filtering Inductance Lf1, output filter capacitor Cf, output inductor Lf2Obtain the sinusoidal ac of high quality on the net in single-phase alternating current afterwards Flow io, n input pulse electric current of the single output high-frequency inverter circuit of n inputs is through input filter Li1-Ci1、Li2-Ci2、…、Lin- CinOr Ci1、Ci2、…、CinAfterwards in n roads input DC power Ui1、Ui2、…、UinIt is middle to obtain smooth input direct-current electric current Ii1、 Ii2、…、Iin.Bipolarity binary states multilevel SPWM voltage wave uAB+ 1 state amplitude for exporting positive half cycle is Ui1+Ui2+…+Uin、Ui1+ Ui2+…+Uin-1、…、Ui1It is U with -1 state amplitudei1+Ui2+…+Uin, -1 state amplitude of output negative half period is Ui1+Ui2+…+Uin、Ui1 +Ui2+…+Uin-1、…、Ui1It is U with+1 state amplitudei1+Ui2+…+Uin;Unipolarity tri-state multilevel SPWM voltage wave uAB+ 1 state It is U with -1 state amplitudei1+Ui2+…+Uin、Ui1+Ui2+…+Uin-1、…、Ui1.It should be added that half bridge circuit is only Deposit bipolarity binary states multilevel SPWM voltage wave u shown in Fig. 6AB, but+1 state amplitude and -1 state during the positive and negative half cycle of output voltage Amplitude should all be multiplied by 1/2.
The series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input belongs to voltage-dropping type inverter, n input Source both can also can simultaneously be powered to the load with timesharing.If the output signal I of n-1 input source error amplifier1e、I2e、…、 I(n-1)eWith the output signal u of output voltage error amplifiereAmplitude be I1em、I2em、I(n-1)em、Uem, saw-toothed carrier signal ucAmplitude be Ucm, then corresponding modulation degree is m1=I1em/Ucm、m2=I2em/Ucm、…、mn=Uem/Ucm, and have 0≤ mn、…、m2、m1≤ 1 and m1> m2> ... > mn.The principle of the inverter is equivalent to multiple voltage-type single input inverters and is exporting The superposition of terminal voltage, i.e. output voltage uoWith input direct-current voltage (Ui1、Ui2、…、Uin), modulation degree (m1、m2、…、mn) between Relationship be uo=m1Ui1+m2Ui2+…+mnUin(Unipolar SPWM control) or uo=(2m1-1)Ui1+(m2+m1-1)Ui2+…+ (mn+m1-1)Uin(bipolar SPWM control).Since there are 0 < m1、m2、…、mn< 1 (Unipolar SPWM control) and (2m1-1)+ (m2+m1-1)+…+(mn+m1- 1) < 1 (bipolar SPWM control), so uo< Ui1+Ui2+…+Uin, i.e. output voltage uoAlways Less than the sum of input direct-current voltage Ui1+Ui2+…+Uin;Since the inverter belongs to single stage circuit structure, the single output of n inputs is high Frequency inverter circuit is provided with the multiple series series simultaneous selection power switch circuit that output terminal is forward connected, therefore this kind of inverter is claimed For the non-isolated inverter of simultaneous selection switching voltage type (voltage-dropping type) single-stage multi input of connecting.N input source of the inverter exists In one HF switch period simultaneously or timesharing is to output AC load power supply, modulation degree can identical (m1=m2=...=mn), It can also be different (m1≠m2≠…≠mn)。
The series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input of the present invention, due to sharing one Multiple input single output high-frequency inverter circuit and an output filter, the biography formed with DC converter and inverter two-stage cascade There is differences substantially for the circuit structure of system multi input inverter.Therefore, inverter of the present invention have novelty and Creativeness, and in one switch periods of multi input power supply simultaneously or time sharing power supply, circuit topology be succinct, single stage power becomes It changes, conversion efficiency high (meaning that energy loss is small), output voltage ripple is small, output capacity is big, at low cost, application prospect is extensive The advantages that, it is a kind of ideal energy-saving type single-stage multi input inverter, energy-saving, conservation-minded society is built vigorously advocating Today, with more important value.
Connect the non-isolated inverter circuit topology race embodiment of simultaneous selection switching voltage type single-stage multi input, as Fig. 8,9, 10th, shown in 11,12,13.In circuit shown in Fig. 8-13, multiple series series simultaneous selection power switch circuit that output terminal is forward connected Unidirectional voltage stress, the two quadrant high frequency powers switch of bidirectional current stress and n diode can be born by n to form, and Bidirectional power flow single-input single-output high-frequency inverter circuit then by it is multiple can bear unidirectional voltage stress, bidirectional current stress two Quadrant high frequency power switch composition (half bridge circuit shown in Fig. 8,9,10 is made of 2 two quadrant high frequency powers switches, Figure 11, 12nd, full bridge circuit shown in 13 is made of 4 two quadrant high frequency powers switches).It is it should be added that electric shown in Fig. 8-13 Road gives input filter as LC wave filter situations, when not providing input filter as space is limited as capacitive filter situation Circuit;Half bridge circuit shown in Fig. 8,9,10 is only applicable to the n of substantially equal situation of input power modulation ratio;The institute of Fig. 8,9,10 The output filter for showing half bridge circuit I, II, III is respectively to export L wave filters, output LC wave filters, output LCL filter, The output filter of full bridge circuit I, II, III shown in Figure 11,12,13 is respectively to export L wave filters, export LC wave filters, is defeated Go out LCL filter.The power for the topological embodiment of two kinds of the non-isolated inverter of simultaneous selection switching voltage type single-stage multi input of connecting Switching voltage stress, as shown in table 1.Half bridge circuit is suitable for middle power high input voltage inversion occasion, and full bridge circuit is applicable in Inversion occasion is inputted in high-power high voltage.The circuit topology race is suitable for multiple input direct-current voltages not altogether, unstable It is transformed into a required voltage swing, stablizes good output alternating current, can be used to realize with excellent performance and extensive use The a variety of new energy distributed power supply systems of sigle-stage AC of prospect, such as photovoltaic cell 400-500VDC/220V50HzAC or The multiple input sources such as 115V400HzAC, large-scale wind generating 510VDC/220V50HzAC or 115V400HzAC are to AC load Or AC network power supply.
The power of the series connection simultaneous selection switching voltage type single-stage multi input of table 1 two kinds of topological embodiments of non-isolated inverter is opened Powered-down compression
Energy management control strategy is vital for a variety of new energy joint electric power system.It is more due to existing A input source and corresponding power switch unit, it is therefore desirable to multiple duty ratios be controlled, that is, there are multiple controls Degree of freedom, this energy management just for a variety of new energy provide possibility.How defeated simultaneous selection switching voltage type single-stage of connecting is Enter the energy management control strategy of low frequency link inverter, energy management, photovoltaic cell and the wind-force of input source need to be provided simultaneously with MPPT, output voltage (electric current) the control three zones of the new energy equipments such as generator, also need to consider accumulator sometimes The smooth and seamless switching of charge and discharge control and system under different powering modes.How defeated simultaneous selection switching voltage type single-stage of connecting is Enter low frequency link inverter using two different energy management modes:(1) energy management modes I-- principals and subordinates power distribution side Formula, it is known that power needed for load as far as possible by main power supply unit the 1st, 2 ..., n-1 roads input source provide, give the 1st, 2 ..., n- The input current of 1 road input source, be equivalent to the given 1st, 2 ..., the input power of n-1 roads input source, load required insufficient work( Rate can be not required to addition batteries to store energy equipment by being provided from the n-th road of power supply unit input source;(2) energy management modes II- Maximum power output mode, the 1st, 2 ..., n roads input source with maximum power output to load, eliminate batteries to store energy and set It is standby, the requirement that grid-connected system makes full use of the energy is realized, if in output terminal and connecing an accumulator cell charging and discharging device also The stabilization of autonomous power supply system output voltage (electric current) can be achieved.When n roads new energy input voltage to timing, pass through control 1st, 2 ..., the input current of n roads input source, be equivalent to control the 1st, 2 ..., the input power of n roads input source.
The series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input, using output voltage, input current wink Duration feedback bipolar SPWM, Unipolar SPWM principal and subordinate's power distribution energy management control strategy, to form autonomous power supply system; Or input current instantaneous values feedback bipolar SPWM, Unipolar SPWM maximum power output energy management control strategy are used, with Form grid-connected system.1st, 2 ..., n-1 roads input source output power fix and the supplement load of the n-th road input source needed for Output voltage, input current instantaneous values feedback bipolar SPWM, the Unipolar SPWM principal and subordinate's power distribution energy pipe of deficit power Control block diagram and control principle waveform are managed, respectively as shown in Figure 14,15,16,17.1st, 2 ..., n-1 roads input source is through maximum work Rate point obtains reference current signal I after calculating* i1r、I* i2r、…、I* i(n-1)r, inverter the 1st, 2 ..., the input current on n-1 roads Feedback signal Ii1f、Ii2f、…、Ii(n-1)fRespectively with the 1st, 2 ..., n-1 roads reference current signal Ii1r、Ii2r、…、Ii(n-1)rThrough than Example integral controller compares amplification, the error signal I being exaggerated1e、I2e、…、I(n-1)eIt is multiplied again with sinusoidal synchronizing signal respectively Through absolute value circuit 1,2 ..., after n-1 ︱ i1e︳, ︳ i2e︱ ..., ︳ i(n-1)e︱, inverter output voltage feedback signal uofWith base Quasi sine voltage urCompare amplification, the error signal u of amplification through proportional and integral controllere︱ u are obtained after absolute value circuit ne︳, ︱ i1e︳, ︳ i2e︱ ..., ︳ i(n-1)e︱, ︱ ue︳ respectively with saw-toothed carrier ucIt hands over and cuts and consider that output voltage gating signal passes through suitably The control signal u of power switch is obtained after combinational logic circuitgss1、ugss2、…、ugssn、ugs1(ugs4)、ugs2(ugs3).Work as load Power PoMore than the 1st, 2 ..., the sum of the maximum power of n-1 roads input source when, output voltage uoReduce, voltage regulator output electricity Press ueVirtual value be more than threshold comparative level UtAnd I1e、I2e、…、I(n-1)eZero is all higher than, diode D1、D2、…、Dn-1Resistance It is disconnected, the 1st, 2 ..., n-1 roads current regulator independently work with the n-th road voltage regulator, i.e. Ii1r=I* i1r、Ii2r= I* i2r、…、Ii(n-1)r=I* i(n-1)r, the 1st, 2 ..., n-1 roads current regulator be used to implement the 1st, 2 ..., n-1 roads input source Maximum power output, the n-th road voltage regulator are used to implement the stabilization of inverter output voltage, n roads input source while or timesharing It powers to the load;As bearing power PoLess than the 1st, 2 ..., the sum of the maximum power of n-1 roads input source when, output voltage uoIncrease Greatly, as regulated output voltage ueVirtual value be reduced to threshold comparative level UtWhen following, diode Dn-1Conducting, D1、 D2、…、Dn-2It still blocks, stagnant ring comparison circuit n+1 exports low level, and the n-th road input source stops power supply, voltage regulator and electricity Throttle regulator forms double closed-loop control system, the 1st, 2 ..., n-1 roads input source in a switch periods simultaneously or timesharing is to negative Carry power supply, the reference current I of current regulatori(n-1)rReduce, i.e. Ii(n-1)r< I* i(n-1)r, the (n-1)th road input source output power It reduces (being operated in non-maximum functional point), the n-th road input source output power is reduced to zero, the output voltage u of inverteroTend to be steady It is fixed.When input voltage or load variation, by adjusting reference voltage urOr feedback voltage uofTo change error voltage signal ︱ ue︳ and error current signal ︱ i1e︳, ︳ i2e︱ ..., ︳ i(n-1)e︱, so as to change modulation degree m1、m2、…、mn, therefore can realize described inverse Become device output voltage, the adjusting of input current (output power) and stabilization.
Input current is controlled when the n-th roads of Figure 14-17 Zhong input source is designed as input current feedback, then is constituted defeated Enter instantaneous current feedback bipolar SPWM, Unipolar SPWM maximum power output energy management control strategy.Inverter the 1st, 2nd ..., the input current feedback signal I on n roadsi1f、Ii2f、…、IinfRespectively with the 1st, 2 ..., n roads input source is through maximum power point The reference current signal I obtained after calculatingi1r、Ii2r、…、IinrCompare amplification, error amplification signal through proportional and integral controller I1e、I2e、…、IneBe multiplied respectively with sinusoidal synchronizing signal through absolute value circuit 1,2 ..., after n ︱ i1e︳, ︳ i2e︱ ..., ︳ ine︱, ︱ i1e︳, ︳ i2e︱ ..., ︳ ine︱ respectively with saw-toothed carrier ucIt hands over and cuts and consider output voltage gating signal through appropriate group The control signal u of power switch is obtained after combinational logic circuitgss1、ugss2、…、ugssn、ugs1(ugs4)、ugs2(ugs3).1st, 2nd ..., n roads current regulator independently works, and is used to realize the maximum power output of respective input source, and n roads input source exists It powers to the load simultaneously in one switch periods.
Figure 15, bipolarity shown in 17, Unipolar SPWM control principle waveform have marked a certain HF switch cycle TSAnd its 1st, 2 ..., the turn-on time T of n roads input sourceon1、Ton2、…、TonnAnd power switch S1Turn-on time Ton, Ton=Ton1 > Ton2> ... > Tonn, turn-on time TonWithin an output voltage period changed by sinusoidal rule.In addition, for Fig. 8, 9th, half bridge circuit I shown in 10, II, III, should be by half of input direct-current voltage value (Ui1/2、Ui2/2、…、Uin/ 2) it is updated to electricity It is calculated in pressure transfer ratio formula.
In order to form the autonomous power supply system that can make full use of multiple input sources energy, multiple input source should be operated in maximum work The rate way of output and energy storage device is needed to configure, to realize the stabilization of output voltage, i.e., in the output terminal of inverter and connect one Single-stage isolated Bidirectional charging-discharging converter, as shown in figure 18.The single-stage isolated Bidirectional charging-discharging converter is by input filter (Li、CiOr Ci), high-frequency inverter, high frequency transformer, frequency converter, output filter (Lf′、Cf') sequentially cascade composition, institute The frequency converter stated is switched by the four-quadrant high frequency power that can bear bi-directional voltage stress and bidirectional current stress and formed.It is described Single-stage isolated Bidirectional charging-discharging converter energy forward direction transmit (energy storage device electric discharge), back transfer (energy storage device charging) When, it is equivalent to a single-stage high frequency link DC-AC converter and a single-stage high frequency link AC-DC converter respectively.
The autonomous power supply system is used with single-stage isolated Bidirectional charging-discharging converter output voltage separate control loop Maximum power output energy management control strategy, as shown in figure 19.As bearing power Po=UoIoMore than the maximum in multiple input source The sum of power P1max+P2max+…+PnmaxWhen, the energy storage devices such as accumulator, super capacitor are become by single-stage isolated Bidirectional charging-discharging Parallel operation provides required deficit power-powering mode II to load, and energy storage device individually powers to the load -- powering mode III, Belong to the egregious cases of powering mode II;As bearing power Po=UoIoThe sum of maximum power less than multiple input source P1max+ P2max+…+PnmaxWhen, the dump energy that multiple input source exports is by single-stage isolated Bidirectional charging-discharging converter to energy storage device Charging -- powering mode I.By taking band resistive load as an example, the power flow direction control of single-stage isolated Bidirectional charging-discharging converter is discussed, As shown in figure 20.For output filter capacitor Cf、Cf' and load ZLFor, simultaneous selection switching voltage type single-stage multi input of connecting The output terminal of non-isolated inverter and single-stage isolated Bidirectional charging-discharging converter simultaneously connects the superposition in parallel for being equivalent to two current sources. Energy management control strategy is it is found that the non-isolated inverter of simultaneous selection switching voltage type single-stage multi input of connecting as shown in Figure 19 Output inductor electric current iLfWith output voltage uoWith the same phase of frequency, active power of output;Charge/discharge transformation device is by exporting electricity Press uoWith reference voltage uorefError amplification signal uoeA section generation SPWM signals is handed over to be controlled with high frequency carrier, output filter Wave inductive current iLf' and uoBetween there are phase difference θ, different phase difference θs means to export the active of different size and direction Power.Work as Po=P1max+P2max+…+PnmaxWhen, θ=90 °, the active power of charge/discharge transformation device output is zero, in zero load State;Work as Po>P1max+P2max+…+PnmaxWhen, uoReduce, 90 ° of θ <, charge/discharge transformation device active power of output, energy storage device pair Load discharge, i.e. energy storage device provide the deficit power needed for load;Work as Po< P1max+P2max+…+PnmaxWhen, uoIncrease, θ > 90 °, the negative active power of charge/discharge transformation device output loads the residue to energy storage device feedback energy, the i.e. output of multiple input source Power charges to energy storage device, is loaded when θ=180 ° maximum to the energy of energy storage device feedback.Therefore, the energy management control Strategy processed can be according to PoWith P1max+P2max+…+PnmaxRelative size control single-stage isolated Bidirectional charging-discharging converter in real time Power flow size and Orientation realizes smooth and seamless switching of the system under three kinds of different powering modes.

Claims (3)

1. a kind of series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input, it is characterised in that:This inverter It is that the input filter on ground and a shared output are filtered altogether by multiple not by a multiple input single output high-frequency inverter circuit Device connection is formed, and each input terminal of multiple input single output high-frequency inverter circuit and the output terminal one of each input filter are a pair of It should couple, the output terminal of multiple input single output high-frequency inverter circuit and the input terminal of the output filter are connected, described The multiple series series simultaneous selection power switch circuit, two-way forward connected by output terminal of multiple input single output high-frequency inverter circuit Power flow single-input single-output high-frequency inverter circuit sequentially cascades composition, and it is defeated to be equivalent to a bidirectional power flow list at any time Enter single output high-frequency inverter circuit, every simultaneous selection power switch circuit of series connection all the way is by a two quadrant power switch It is formed with a power diode and the source electrode of two quadrant power switch is connected with the cathode of power diode, two quadrant The drain electrode of power switch and the anode of power diode are respectively the positive and negative polarity of road series connection simultaneous selection power switch circuit Input terminal, the source electrode of the two quadrants power switch and the anode of power diode are respectively that road series connection simultaneous selection power is opened The positive and negative polarity output terminal on powered-down road;The output filter be made of output inductor or by output inductor, Output filter capacitor sequentially cascades composition or sequentially cascades structure by output inductor, output filter capacitor, output inductor Into.
2. the series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input according to claim 1, feature It is:The circuit topology of the series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input is semibridge system, full-bridge Formula circuit.
3. the series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input according to claim 1, feature It is:The output terminal of the series connection non-isolated inverter of simultaneous selection switching voltage type single-stage multi input simultaneously connects an energy storage device Single-stage isolated Bidirectional charging-discharging converter, with form an output voltage stabilization autonomous power supply system;The single-stage every From Bidirectional charging-discharging converter by input filter, high-frequency inverter, high frequency transformer, frequency converter, output filter according to Sequence cascade is formed, and the frequency converter is by that can bear the four-quadrant high frequency power of bi-directional voltage stress and bidirectional current stress Switch is formed;Multiple input source is operated in maximum power output mode, according to bearing power and multiple input source maximum power The sum of relative size control the power flow size and Orientation of single-stage isolated Bidirectional charging-discharging converter in real time, realize system output Voltage stabilization and the switching of the smooth and seamless of energy storage device charge and discharge.
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Application publication date: 20180612