CN108199603A - Flyback DC chopped-wave type single-stage multi input inverter is isolated in Multiple coil time sharing power supply - Google Patents

Flyback DC chopped-wave type single-stage multi input inverter is isolated in Multiple coil time sharing power supply Download PDF

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CN108199603A
CN108199603A CN201810020132.9A CN201810020132A CN108199603A CN 108199603 A CN108199603 A CN 108199603A CN 201810020132 A CN201810020132 A CN 201810020132A CN 108199603 A CN108199603 A CN 108199603A
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output
input
flyback
isolated
inverter
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CN108199603B (en
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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
    • H02M7/66Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
    • H02M7/797Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
    • H02J3/382
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584Bidirectional converters
    • 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
    • Y02E10/70Wind 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 Multiple coil time sharing power supplies to be isolated flyback DC chopped-wave type single-stage multi input inverter, its circuit structure is that two-way flyback dc chopper is isolated by a combined type multiple input single output to form the shared output filter circuit connection of the input filter of multiple isolation and one, each input terminal that two-way flyback dc chopper is isolated in combined type multiple input single output couples with the output terminal of each input filter one-to-one correspondence, and output terminal is connected with output filter circuit.Reliability is high, output capacity is small, application prospect is extensive when this inverter has the characteristics that multiple input sources electrical isolation, time sharing power supply, output with inputting succinct electrical isolation, circuit topology, single-stage power conversion, power density height, conversion efficiency height, load short circuits, and the low capacity distributed power supply system powered for a variety of new energy joints of realization has established key technology.

Description

Flyback DC chopped-wave type single-stage multi input inverter is isolated in Multiple coil time sharing power supply
Technical field
Flyback DC chopped-wave type single-stage multi input inverter is isolated in Multiple coil time sharing power supply according to the present invention, belongs to electricity Power electronics 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 is low-frequency electric to be isolated or the inverter of high frequency electrical isolation between input DC power, be referred to as low frequency link, high frequency ring Save inverter.Electrical isolation element has primarily served following effect in inverter:(1) inverter output and input are realized Between electrical isolation, improve the security reliability and Electro Magnetic Compatibility of invertor operation;(2) inverter output voltage is realized Matching between input voltage, that is, realize inverter output voltage be higher than, the technique effect equal to or less than input voltage, Its application range has obtained widening significantly;(3) when the working frequency of transformer or storage transformer is in more than 20kHz, Volume, weight greatly reduce, and audio noise also eliminates.Therefore, with dc generator, accumulator, photovoltaic cell and combustion Expect the secondary transformation of electrical energy occasion that battery etc. is main dc power supply, inverter has important application 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
It is a kind of with a variety of new energy joint is powered, input DC power is mutually isolated, group the invention aims to provide Two-way flyback dc chopper setting multiple input single output storage transformer, output and input is isolated in box-like multiple input single output Between electrical isolation, multiple input power supply timesharing power to the load, circuit topology is succinct, single-stage power conversion, conversion efficiency are high, The Multiple coil time sharing power supply isolation flyback direct current for the features such as reliability is high during load short circuits, output capacity is small, application prospect is extensive Chopper-type single-stage multi input inverter.
Technical program of the present invention lies in:A kind of Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input is inverse Become device, be that two-way flyback dc chopper is isolated by multiple mutually isolated input filters by a combined type multiple input single output Device and a shared output filter circuit connection are formed, and two-way flyback dc chopper is isolated in combined type multiple input single output Each input terminal couples with the output terminal one-to-one correspondence of each input filter, and two-way flyback is isolated in combined type multiple input single output The output terminal of dc chopper is connected with output filter circuit;It is straight that two-way flyback is isolated in the combined type multiple input single output Flow chopper by two it is identical, output low frequency positive half cycle and low frequency negative half period unipolar PWM current wave is how defeated respectively The each input terminal one-to-one correspondence parallel outputs for entering the two-way flyback dc chopper of single output isolation are reversely connected in series to form, and Two output terminals that the two-way non-series connection of flyback dc chopper is isolated in two multiple input single outputs are combined type multiple input single output The output terminal of two-way flyback dc chopper is isolated;Two-way flyback dc chopper is isolated in each multiple input single output It is by the storage transformer of a multiple input single output that multiple mutually isolated bidirectional power flow single-input single-output high frequencies are inverse Become circuit and a shared rectification, polarity selection formed with the hf rectifier connection of two quadrant high frequency powers switch composition, Each input terminal of multiple input single output storage transformer couples with the output terminal of each high-frequency inverter circuit one-to-one correspondence, more The output terminal of the single output storage transformer of input and the input terminal of hf rectifier are connected;Each high-frequency inversion electricity The input terminal on road is each input terminal that two-way flyback dc chopper is isolated in the combined type multiple input single output, described Each high-frequency inverter circuit by four-quadrant high frequency power switch and two quadrant high frequency powers switch form or only by four-quadrant Limit for height frequency power switch form, the output filter circuit be made of filter capacitor or by filter capacitor, filter inductance sequentially Cascade 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 Multiple coil time sharing power supply, carry Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input inverter circuit structure and topological race and its energy are gone out Management and controlling tactics, the i.e. circuit structure are that two-way flyback DC chopped-wave is isolated by providing a kind of combined type multiple input single output Device couples multiple mutually isolated input filters and a shared output filter circuit.
The Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input inverter of the present invention, can be by multiple phases Mutually isolation, unstable input direct-current voltage, which are reverse into needed for a load, stablizes good output alternating current, how defeated has Enter DC power supply is mutually isolated, output powers to the load with input electrical isolation, multi input power supply timesharing, circuit topology is succinct, Single-stage power conversion, conversion efficiency are high, change range of input voltage is wide, load reliability height, output capacity when overloading and is short-circuit Small, the features such as application prospect is extensive.The synthesis of flyback DC chopped-wave type single-stage multi input inverter is isolated in Multiple coil time sharing power supply Performance, 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, Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input inverter principle block diagram.
Fig. 5, Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input inverter circuit structure chart.
Fig. 6, output voltage instantaneous value SPWM control Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input Inverter steady principle oscillogram.
Fig. 7, Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input inverter circuit topology example One ----single switch flyback DC chopped-wave type circuit diagram.
Fig. 8, Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input inverter circuit topology example Two ----double-transistor flyback DC chopped-wave type circuit diagram.
Fig. 9, Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input inverter circuit topology example Three ----paralleling and interleaving single switch flyback DC chopped-wave type circuit diagram.
Figure 10, Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input inverter circuit topology example Four ----paralleling and interleaving double-transistor flyback DC chopped-wave type circuit diagram.
Figure 11, Multiple coil time sharing power supply single hose and double hose isolation flyback DC chopped-wave type single-stage multi input inverter Output voltage, input current instantaneous value SPWM principal and subordinate's power distribution energy management control block diagrams.
Figure 12, Multiple coil time sharing power supply single hose and double hose isolation flyback DC chopped-wave type single-stage multi input inverter Output voltage, input current instantaneous value SPWM principal and subordinate's power distribution energy management control principle oscillograms.
Figure 13, Multiple coil time sharing power supply paralleling and interleaving single hose and paralleling and interleaving double hose isolation flyback DC chopped-wave type list Output voltage, the input current instantaneous value SPWM principal and subordinate's power distribution energy management control block diagrams of grade multi input inverter.
Figure 14, Multiple coil time sharing power supply paralleling and interleaving single hose and paralleling and interleaving double hose isolation flyback DC chopped-wave type list Output voltage, the input current instantaneous value SPWM principal and subordinate's power distribution energy management control principle waveforms of grade multi input inverter Figure.
Figure 15, have output terminal and connect single-stage isolated Bidirectional charging-discharging converter Multiple coil time sharing power supply isolation flyback it is straight Flow chopper-type single-stage multi input autonomous power supply system.
Figure 16 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 17, the output voltage u of autonomous power supply systemo, output current iLfWith output inductor iLf' waveform.
Specific embodiment
With reference to the accompanying drawings of the specification and embodiment is described further technical scheme of the present invention.
Flyback DC chopped-wave type single-stage multi input inverter is isolated in Multiple coil time sharing power supply, is by a combined type multi input Two-way flyback dc chopper is isolated by the shared output filtered electrical of multiple mutually isolated input filters and one in single output Road connection is formed, and each input terminal of two-way flyback dc chopper and each input filter is isolated in combined type multiple input single output The output terminal of device corresponds connection, and output terminal and the output of two-way flyback dc chopper is isolated in combined type multiple input single output Filter circuit is connected;The combined type multiple input single output be isolated two-way flyback dc chopper by two it is identical, point It is straight that two-way flyback is isolated in the multiple input single output of other output low frequency positive half cycle and low frequency negative half period unipolar PWM current wave Each input terminal of stream chopper corresponds parallel outputs and is reversely connected in series to form, and two multiple input single output isolation are double Two-way flyback dc chopper is isolated for combined type multiple input single output to two output terminals of the non-series connection of flyback dc chopper Output terminal;It is by the storage of a multiple input single output that two-way flyback dc chopper, which is isolated, in each multiple input single output Can formula transformer by multiple mutually isolated bidirectional power flow single-input single-output high-frequency inverter circuits and a shared rectification, Polarity selection is coupled with the hf rectifier that two quadrant high frequency powers switch is formed to be formed, multiple input single output storage transformer Each input terminal and the output terminal of each high-frequency inverter circuit one-to-one correspondence couple, multiple input single output storage transformer The input terminal of output terminal and hf rectifier is connected;The input terminal of each high-frequency inverter circuit is the combination Each input terminal of two-way flyback dc chopper is isolated in formula multiple input single output, and each high-frequency inverter circuit is by four Quadrant high frequency power switchs and two quadrant high frequency powers switch is formed or is only made of four-quadrant high frequency power switch, described Output filter circuit is made of filter capacitor or is sequentially cascaded and formed by filter capacitor, filter inductance.
The Multiple coil time sharing power supply isolation functional block diagram of flyback DC chopped-wave type single-stage multi input inverter, circuit structure, Steady principle waveform when output voltage instantaneous value SPWM is controlled, respectively as shown in Figure 4,5, 6.In Fig. 4,5,6, Ui1、Ui2、…、 UinFor n roads input direct-current voltage source (n is the natural number more than 1), ZLFor single-phase output AC load, uo、ioIt is respectively single-phase defeated Go out alternating voltage (including ac grid voltage) and alternating current.Two-way flyback DC chopped-wave is isolated in combined type multiple input single output Device is by two identical, output low frequency positive half cycle and low frequency negative half period unipolar PWM current wave i respectivelyo1、io2It is how defeated The each input terminal one-to-one correspondence parallel outputs for entering the two-way flyback dc chopper of single output isolation are reversely connected in series to form, and Two output terminals that the two-way non-series connection of flyback dc chopper is isolated in two multiple input single outputs are combined type multiple input single output The output terminal of two-way flyback dc chopper is isolated, it is equal that two-way flyback dc chopper is isolated in two identical multiple input single outputs It is by the storage transformer of a multiple input single output that multiple mutually isolated bidirectional power flow single-input single-outputs are high respectively Frequency inverter circuit and a shared rectification, polarity selection couple structure with the hf rectifier that two quadrant high frequency powers switch is formed Into being by multiple single-input single-output high-frequency inverter circuits, the storage transformer of multiple input single output, a shared rectification Sequentially cascade composition with hf rectifier with polarity selection, any time be equivalent to a bidirectional power flow single-input single-output every From two-way flyback dc chopper.It is defeated in a low frequency that two-way flyback dc chopper is isolated in two identical multiple input single outputs Go out in voltage cycle to take turns to operate half of low-frequency cycle, i.e. the i when a dc chopper work output low frequency positive half cycleo1, and Another dc chopper is stopped and polarity selection is connected with two quadrant power switch, io2=0 and uo2=0, it is filtered through output Sinusoidal ac u is exported after wave deviceO、iOPositive half cycle;Conversely, when dc chopper works output low frequency negative half period io2, and another dc chopper is stopped and two quadrant power switch of polarity selection are connected, io1=0 and uo1=0, warp Sinusoidal ac u is exported after output filterO、iONegative half period.Each single-input single-output high-frequency inverter circuit by Four-quadrant high frequency power switchs and two quadrant high frequency powers switch is formed or is only made of four-quadrant high frequency power switch, described Shared rectification, polarity selection hf rectifier by two quadrant high frequency powers switch form, can be selected MOSFET, IGBT, GTR constant power devices.Output filter circuit is to be made of filter capacitor or sequentially cascaded and formed by filter capacitor, filter inductance, The output capacitance electricity for being depicted in figure suitable for the output capacitance wave filter of passive AC load and being loaded suitable for AC network Feel the circuit diagram of two kinds of situations of wave filter;N roads input filter is LC wave filters (the filter inductance L of the dashed box containing additioni1、 Li2、…、Lin) or capacitive filter (the filter inductance L without addition dashed boxi1、Li2、…、Lin), using n roads during LC wave filters Input direct-current electric current can be smoother.The n roads high-frequency inversion electricity in two-way flyback dc chopper is isolated in each multiple input single output Road is respectively by input direct-current voltage source Ui1、Ui2、…、UinIt is how oblique by the unipolarity tri-state that sinusoidal envelope line is distributed to be modulated into amplitude Rate SPWM current waves iN111+iN121+…+iN1n1、iN211+iN221+…+iN2n1, through storage transformer T1、T2Isolation and high frequency are whole Stream device is rectified into the unipolarity tri-state single-slope SPWM current waves i that amplitude is distributed by sinusoidal envelope lineo1、io2, through exporting filtered electrical Obtain the sinusoidal voltage u of high quality after appearance on the net in single phase ac passive load or single-phase alternating currentoOr sinusoidal ac Flow io, n input pulse electric current of the two-way flyback dc chopper of each single output isolation 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 DC current Ii1、Ii2、…、Iin.If it is U to export sinusoidal voltage virtual valueo, the storage transformer primary side winding number of turn is respectively N111=N211=N11、N121=N221=N21、…、N1n1=N2n1=Nn1, vice-side winding number of turn N12=N22=N2, primary side winding Inductance is respectively L11、L21、…、Ln1, the inductance of vice-side winding is L2, then bipolarity binary states multilevel SPWM voltage wave u12、u22's Amplitude isWith-Ui1N2/N11、-Ui2N2/N21、…、-UinN2/Nn1, unipolarity tri-state multilevel SPWM current wave iN111 (iN211)、iN121(iN221)、…、iN1n1(iN2n1) the rate of rise be respectively Ui1/L11、Ui2/L21、…、Uin/Ln1, unipolarity three State list level SPWM current wave io1、io2Descending slope be-uo/L2
Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input inverter belongs to voltage boosting/reducing inverter, n A input source timesharing powers to the load, and principle is equivalent to the magnetic flux or storing up that multiple input source generates in storage transformer The superposition of current increment that energy formula transformer primary side inductance generates.If power selector switch S111(S111′、S112、S112′、S211、 S211′、S212、S212′)、S121(S121′、S122、S122′、S221、S221′、S222、S222′)、…、S1n1(S1n1′、S1n2、S1n2′、S2n1、 S2n1′、S2n2、S2n2') duty ratio be respectively d1、d2、…、dn, according to one HF switch during high frequency storage transformer stable state The incrementss of magnetic flux, which are approximately equal to the decrement of magnetic flux, in period can derive output voltage uo and input direct-current voltage (Ui1、 Ui2、…、Uin), the storage transformer turn ratio (N2/N11、N2/N21、…、N2/Nn1), duty ratio (d1、d2、…、dn) between pass System, i.e. uo=(d1Ui1N2/N11+d2Ui2N2/N21+…+dnUinN2/Nn1)/(1-d1-d2-…-dn).For appropriate duty ratio (d1、d2、…、dn) and the storage transformer turn ratio (N2/N11、N2/N21、…、N2/Nn1), uoIt can be greater than, equal to or less than defeated Enter the sum of DC voltage Ui1+Ui2+…+Uin, the storage transformer in the inverter, which not only plays, improves invertor operation Security reliability and Electro Magnetic Compatibility, it is often more important that play the role of matched output voltage and input voltage, that is, realize The output voltage of inverter is higher than, equal to or less than the sum of input direct-current voltage Ui1+Ui2+…+UinTechnique effect, application Range has obtained widening significantly.As 0.5 < d1+d2+…+dn1 or 0 < d of <1+d2+…+dnDuring < 0.5, it is respectively present uo> Ui1N2/N11+Ui2N2/N21+…+UinN2/Nn1Or uo< Ui1N2/N11+Ui2N2/N21+…+UinN2/Nn1, i.e. output voltage uoIt is higher than Or less than input direct-current voltage (Ui1、Ui2、…、Uin) and the storage transformer turn ratio (N2/N11、N2/N21、…、N2/Nn1) multiply The sum of product Ui1N2/N11+Ui2N2/N21+…+UinN2/Nn1;Since the inverter belongs to single stage circuit structure, output is deposited with input It is isolated in storage transformer, combined type multiple input single output is isolated two-way flyback dc chopper and is provided with multiple input single output Storage transformer, therefore this kind of inverter is known as Multiple coil time sharing power supply isolation flyback DC chopped-wave type (buck-boost type) single-stage Multi input inverter.For storage transformer there are two kinds of working methods of high frequency magnetic reset and low frequency magnetic reset, the former is energy storage type Transformer realizes magnetic-reset within a HF switch period, for power reverse flow is avoided to can only operate in critical CCM moulds Formula and use PFM control strategies, no audio noise belong to annulus inverter in high frequency;The latter is that storage transformer is defeated at one Go out and magnetic-reset is realized in the low-frequency cycle, be operated in CCM patterns and constant frequency SPWM control strategies, have audio noise, be not belonging to height Frequency annulus inverter.To output AC load power supply, duty ratio can identical (d for n input source timesharing of the inverter1=d2 =...=dn), it can also be different (d1≠d2≠…≠dn)。
Flyback DC chopped-wave type single-stage multi input inverter is isolated in Multiple coil time sharing power supply of the present invention, due to sharing Two-way flyback dc chopper and an output filter circuit is isolated in one combined type multiple input single output, with DC converter and There is differences substantially for the circuit structure for traditional multi input inverter that inverter two-stage cascade is formed.Therefore, it is of the invention The inverter has novelty and creativeness, and with output and input electrical isolation, multi input power supply time sharing power supply, electricity Road topology is succinct, single-stage power conversion, buck than it is big, change range of input voltage is wide, input voltage prepare flexibly, transformation imitates Reliability is high, output capacity is small, at low cost, application prospect is wide when rate height (meaning that energy loss is small), load overload and short circuit The features such as general, is a kind of ideal energy-saving type single-stage multi input inverter, energy-saving, economizing type society is built vigorously advocating Today of meeting, with more important value.
Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input inverter circuit topology race embodiment, such as schemes 7th, shown in 8,9,10.In circuit shown in Fig. 7-10, per road single-input single-output high-frequency inverter circuit by 1-2 four-quadrant high frequency Power switch and 1-2 two quadrant high frequency powers switches form (certain circuits also contain power diode) or only by 1-2 four Quadrant high frequency power switch is formed, and a shared rectification, polarity selection hf rectifier are by multiple two quadrants high frequency work( Rate switch realizes that two multiple input single outputs isolation that combined type multiple input single output is isolated in two-way flyback dc chopper is double It takes turns to operate half of low frequency output period to flyback dc chopper.Precisely, the type of single switch flyback DC chopped-wave shown in Fig. 7 electricity Road, be bi-directional voltage stress can be born by 2n, the four-quadrant high frequency power switch of bidirectional current stress and 4 can bear it is unidirectional Voltage stress, bidirectional current stress two quadrant high frequency powers switch and realize;The type of double-transistor flyback DC chopped-wave shown in Fig. 8 electricity Road, be bi-directional voltage stress can be born by 2n, the four-quadrant high frequency power switch of bidirectional current stress and 2n+4 can bear Unidirectional voltage stress, two quadrant high frequency powers switch of bidirectional current stress and 4n diode are realized;It is in parallel shown in Fig. 9 to hand over Wrong single switch flyback DC chopped-wave type circuit is the four-quadrant high frequency that can bear bi-directional voltage stress, bidirectional current stress by 4n Power switch and 6 can bear unidirectional voltage stress, two quadrant high frequency powers of bidirectional current stress switch to realize;Figure 10 institutes It is the four-quadrant that can bear bi-directional voltage stress, bidirectional current stress by 4n to show paralleling and interleaving double-transistor flyback DC chopped-wave type circuit Limit for height frequency power switch and the 4n+6 two quadrant high frequency powers switches and 8n that can bear unidirectional voltage stress, bidirectional current stress A diode is realized.It should be added that circuit shown in Fig. 7-10 gives input filter as LC wave filter situations, Circuit when not providing input filter as space is limited as capacitive filter situation;Circuit is only depicted and is suitable for shown in Fig. 7-10 The circuit diagram of the output capacitance wave filter of passive AC load, and it is not drawn into being suitable for the output capacitance inductance of AC network load The circuit diagram of wave filter.The work(of flyback DC chopped-wave type single-stage multi input inverter topology embodiment is isolated in Multiple coil time sharing power supply Rate switching voltage stress, as shown in table 1.In table 1, UN2max=max (Ui1N2/N11、Ui2N2/N21、…、UinN2/Nn1), UoIt is defeated Go out sinusoidal voltage uoVirtual value.Single hose, paralleling and interleaving single hose circuit are suitable for small-power low pressure and input inversion occasion, double Tubular type, paralleling and interleaving double hose circuit are suitable for low-power high-voltage and input inversion occasion.The circuit topology race is suitable for will be multiple Mutually isolated, unstable input dc power buckling changes a required voltage swing into, stablizes good output alternating current, can use To realize a variety of new energy distributed power supply systems of sigle-stage AC with excellent performance and wide application prospect, such as photovoltaic cell 40-60VDC/220V50HzAC or 115V400HzAC, Proton Exchange Membrane Fuel Cells 85-120V/220V50HzAC Or115V400HzAC, middle-size and small-size family wind-power electricity generation 24-36-48VDC/220V50HzAC or 115V400HzAC, large-scale wind The multiple input sources such as power power generation 510VDC/220V50HzAC or 115V400HzAC power to AC load or AC network.
The power of 1 Multiple coil time sharing power supply of table isolation flyback DC chopped-wave type single-stage multi input inverter topology embodiment 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.Flyback DC chopped-wave is isolated in Multiple coil time sharing power supply The energy management control strategy of type single-stage multi input inverter need to be provided simultaneously with energy management, photovoltaic cell and the wind of input source MPPT, output voltage (electric current) the control three zones of the new energy equipments such as power generator, also need to consider accumulator sometimes Charge and discharge control and system under different powering modes smooth and seamless switching.Multiple coil time sharing power supply isolation flyback direct current is cut Wave mode single-stage multi input inverter uses two different energy management modes:(1) energy management modes I-- principals and subordinates power distribution Mode, 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 ..., The input current of n-1 roads input source, be equivalent to the given 1st, 2 ..., the input power of n-1 roads input source, load required deficiency Power 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 accumulator storage Energy equipment, realizes the requirement that grid-connected system makes full use of the energy, if in output terminal and connecing an accumulator cell charging and discharging Device can also be achieved the stabilization of autonomous power supply system output voltage (electric current).When n roads new energy input voltage to timing, pass through Control the 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.
Magnetic-reset is realized within an output low frequency period with storage transformer, is operated in CCM patterns and using permanent For frequency SPWM control strategies, the energy management control strategy of this kind of inverter is discussed.Multiple coil time sharing power supply isolation flyback is straight Chopper-type single-stage multi input inverter is flowed, using output voltage, input current instantaneous value SPWM principal and subordinate's power distribution energy managements Control strategy, to form autonomous power supply system;Or using input current instantaneous value SPWM maximum power outputs energy management control Strategy, to form grid-connected system.1st, 2 ..., n-1 roads input source output power is fixed and the supplement load of the n-th road input source Output voltage, input current instantaneous value SPWM principals and subordinates power distribution energy management control block diagram and the control of required deficit power Principle waveform, respectively as shown in Figure 11,12,13,14.Figure 11,12 control program for single hose and double hose circuit topology, figure 13rd, 14 control program for paralleling and interleaving single hose and paralleling and interleaving double hose circuit topology, the two is inherently ten split-phases As.The basic thought of the control program is that the n roads high frequency in two-way flyback dc chopper is isolated in each multiple input single output Inverter circuit is respectively by input direct-current voltage source Ui1、Ui2、…、UinIt is modulated into the unipolarity three that amplitude is distributed by sinusoidal envelope line State multi slope SPWM current waves iN111+iN121+…+iN1n1、iN211+iN221+…+iN2n1, the 1st, 2 ..., n-1 roads high-frequency inversion electricity The turn-on time of road power switch is to hand over to intercept and capture with sawtooth wave according to the product of error current size and reference sinusoidal synchronizing signal (realize the 1st, 2 ..., the maximum power output of n-1 roads input source), the turn-on time of the n-th tunnel selection power switch be according to Error voltage size is intercepted and captured with sawtooth wave friendship and (realizes supplying for the n-th tunnel input source power), and n roads high-frequency inverter circuit power is opened The turn-on time T of passon1、Ton2、…、TonnThe sum of for the total turn-on time T of inverse switchon, through storage transformer T1(T′1)、 T2(T′2) isolation and hf rectifier be rectified into the unipolarity tri-state single-slope SPWM current waves that amplitude is distributed by sinusoidal envelope line io1、io2, the sinusoidal voltage u of high quality is obtained after filteredoOr simple sinusoidal alternating current io;By adjusting output voltage error Signal realizes the stabilization of inverter output voltage, which is suitable for circuit shown in Fig. 7-10.1st, 2 ..., n-1 roads Input source obtains reference current signal I after maximum power point calculates* i1r、I* i2r、…、I* i(n-1)r, inverter the 1st, 2 ..., The input current feedback signal I on n-1 roadsi1f、Ii2f、…、Ii(n-1)fRespectively with the 1st, 2 ..., n-1 roads reference current signal Ii1r、 Ii2r、…、Ii(n-1)rCompare amplification through proportional and integral controller, the error signal I being exaggerated1e、I2e、…、I(n-1)eRespectively with base Quasi sine synchronizing signal obtains i after being multiplied1e、i2e、…、i(n-1)eAnd inversion signal-i1e、-i2e、…、-i(n-1)e, inverter it is defeated Go out voltage feedback signal uofWith reference sinusoidal voltage urCompare amplification through proportional and integral controller and obtain voltage error amplified signal ue, i1e、i2e、…、i(n-1)e、ue、-i1e、-i2e、…、-i(n-1)e、-ueRespectively with unipolarity saw-toothed carrier ucCompare, consider Output voltage polarity selection signal and Fig. 7 is obtained after appropriate combinational logic circuit, single hose shown in 8 and double hose circuit are opened up The power switch control signal u flutterredgs111(ugs′111)、ugs121(ugs′121)、…、ugs1n1(ugs′1n1)、ugs211(ugs′211)、ugs221 (ugs′221)、…、ugs2n1(ugs′2n1)、ugs13、ugs23、ugs15、ugs25Or Fig. 9, paralleling and interleaving single hose and paralleling and interleaving shown in 10 The power switch control signal u of double hose circuit topologygs111(ugs′111)、ugs121(ugs′121)、…、ugs1n1(ugs′1n1)、ugs112 (ugs′112)、ugs122(ugs′122)、…、ugs1n2(ugs′1n2)、ugs211(ugs′211)、ugs221(ugs′221)、…、ugs2n1(ugs′2n1)、 ugs212(ugs′212)、ugs222(ugs′222)、…、ugs2n2(ugs′2n2)、ugs13、ugs14、ugs15、ugs23、ugs24、ugs25.When load work( Rate PoMore than the 1st, 2 ..., the sum of the maximum power of n-1 roads input source when, output voltage uoReduce, regulated output voltage ueVirtual value be more than threshold comparative level UtAnd I1e、I2e、…、I(n-1)eZero is all higher than, diode D1、D2、…、Dn-1It blocks, 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, and the input source timesharing of n roads is to load Power supply;As bearing power PoLess than the 1st, 2 ..., the sum of the maximum power of n-1 roads input source when, output voltage uoIncrease, works as electricity Press regulator 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 current regulation Device form double closed-loop control system, the 1st, 2 ..., the timesharing in a switch periods of n-1 roads input source power to the load, electric current The reference current I of adjusteri(n-1)rReduce, i.e. Ii(n-1)r< I* i(n-1)r, the (n-1)th road input source output power, which reduces, (to be operated in Non- maximum functional point), the n-th road input source output power is reduced to zero, the output voltage u of inverteroIt tends towards stability.Work as input voltage Or during load variation, by adjusting reference voltage urOr feedback voltage uofTo change error voltage signal ueWith error current signal i1e、i2e、…、i(n-1)e, so as to change duty ratio d1、d2、…、dn, therefore can realize the inverter output voltage, input current The adjusting of (output power) and stabilization.
Input current is controlled when the n-th roads of Figure 11-14 Zhong input source is designed as input current feedback, then is constituted defeated Enter current instantaneous value SPWM maximum power output energy management control strategies.1st, 2 ..., n roads current regulator independently work Make, be used to realize the maximum power output of respective input source, the input source timesharing of n roads powers to the load.
Figure 12, control principle waveform has marked HF switch cycle T shown in 14S, a certain HF switch cycle TSInterior 1st, 2nd ..., the turn-on time T of n roads input sourceon1、Ton2、…、TonnThe turn-on time T total with inverse switchon=Ton1+Ton2+…+ Tonn, total turn-on time T of inverse switchonWithin an output voltage period changed by sinusoidal rule.
When energy is transmitted to output AC load side from input dc power source forward direction, double hose, paralleling and interleaving are two-tube The n turn ratio of formula circuit storage transformer must satisfy
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 15.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 16.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 17.For output filter capacitor Cf、Cf' and load ZLFor, Multiple coil time sharing power supply isolation flyback DC chopped-wave type The output terminal of single-stage multi input inverter and single-stage isolated Bidirectional charging-discharging converter simultaneously connects the parallel connection for being equivalent to two current sources Superposition.Energy management control strategy is it is found that how defeated Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage is as shown in Figure 16 Enter the output current i of inverterLfFundametal compoment and output voltage uoWith the same phase of frequency, active power of output;And charge/discharge transformation Device is by output voltage uoWith reference voltage uorefError amplification signal uoeThe SPWM signals for cutting generation are handed over high frequency carrier It is controlled, output inductor electric current iLf' and uoBetween there are phase difference θ, out of phase difference θ means that output is different Size and Orientation active power.Work as Po=P1max+P2max+…+PnmaxWhen, θ=90 °, the active power of charge/discharge transformation device output It is zero, in light condition;Work as Po>P1max+P2max+…+PnmaxWhen, uoReduce, 90 ° of θ <, charge/discharge transformation device output wattful power Rate, energy storage device provide the deficit power needed for load to load discharge, i.e. energy storage device;Work as Po< P1max+P2max+…+Pnmax When, uoIncrease, 90 ° of θ >, the negative active power of charge/discharge transformation device output are loaded to energy storage device feedback energy, i.e. multiple input The dump power of source output 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 can be according to PoWith P1max+P2max+…+PnmaxRelative size control single-stage isolated is two-way to fill in real time The power flow size and Orientation of electric discharge converter realizes smooth and seamless switching of the system under three kinds of different powering modes.

Claims (3)

1. flyback DC chopped-wave type single-stage multi input inverter is isolated in a kind of Multiple coil time sharing power supply, it is characterised in that:It is this inverse It is that two-way flyback dc chopper is isolated by multiple mutually isolated input filters by a combined type multiple input single output to become device Device and a shared output filter circuit connection are formed, and two-way flyback dc chopper is isolated in combined type multiple input single output Each input terminal couples with the output terminal one-to-one correspondence of each input filter, and two-way flyback is isolated in combined type multiple input single output The output terminal of dc chopper is connected with output filter circuit;It is straight that two-way flyback is isolated in the combined type multiple input single output Flow chopper by two it is identical, output low frequency positive half cycle and low frequency negative half period unipolar PWM current wave is how defeated respectively The each input terminal one-to-one correspondence parallel outputs for entering the two-way flyback dc chopper of single output isolation are reversely connected in series to form, and Two output terminals that the two-way non-series connection of flyback dc chopper is isolated in two multiple input single outputs are combined type multiple input single output The output terminal of two-way flyback dc chopper is isolated;Two-way flyback dc chopper is isolated in each multiple input single output It is by the storage transformer of a multiple input single output that multiple mutually isolated bidirectional power flow single-input single-output high frequencies are inverse Become circuit and a shared rectification, polarity selection formed with the hf rectifier connection of two quadrant high frequency powers switch composition, Each input terminal of multiple input single output storage transformer couples with the output terminal of each high-frequency inverter circuit one-to-one correspondence, more The output terminal of the single output storage transformer of input and the input terminal of hf rectifier are connected;Each high-frequency inversion electricity The input terminal on road is each input terminal that two-way flyback dc chopper is isolated in the combined type multiple input single output, described Each high-frequency inverter circuit by four-quadrant high frequency power switch and two quadrant high frequency powers switch form or only by four-quadrant Limit for height frequency power switch form, the output filter circuit be made of filter capacitor or by filter capacitor, filter inductance sequentially Cascade is formed.
2. flyback DC chopped-wave type single-stage multi input inverter is isolated in Multiple coil time sharing power supply according to claim 1, It is characterized in that:The circuit topology of the Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input inverter is single tube Flyback DC chopped-wave type, double-transistor flyback DC chopped-wave type, paralleling and interleaving single switch flyback DC chopped-wave type, paralleling and interleaving double-transistor flyback DC chopped-wave type circuit.
3. flyback DC chopped-wave type single-stage multi input inverter is isolated in Multiple coil time sharing power supply according to claim 1, It is characterized in that:The output terminal of Multiple coil time sharing power supply isolation flyback DC chopped-wave type single-stage multi input inverter simultaneously connects one The single-stage isolated Bidirectional charging-discharging converter of energy storage device, to form the autonomous power supply system of an output voltage stabilization;It is described Single-stage isolated Bidirectional charging-discharging converter by input filter, high-frequency inverter, high frequency transformer, frequency converter, output Wave filter sequentially cascades composition, and the frequency converter is by that can bear the four-quadrant of bi-directional voltage stress and bidirectional current stress High frequency power switch is formed;Multiple input source is operated in maximum power output mode, according to bearing power and multiple input source The relative size of the sum of maximum power controls the power flow size and Orientation of single-stage isolated Bidirectional charging-discharging converter in real time, realizes System output voltage is stablized and the smooth and seamless of energy storage device charge and discharge switches.
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