CN108199598A - Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter - Google Patents

Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter Download PDF

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Publication number
CN108199598A
CN108199598A CN201810019754.XA CN201810019754A CN108199598A CN 108199598 A CN108199598 A CN 108199598A CN 201810019754 A CN201810019754 A CN 201810019754A CN 108199598 A CN108199598 A CN 108199598A
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China
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output
input
frequency
inverter
power supply
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CN201810019754.XA
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Chinese (zh)
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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
    • H02M7/53Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • 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
    • H02M1/12Arrangements for reducing harmonics from ac input or output
    • H02M1/126Arrangements for reducing harmonics from ac input or output using passive filters
    • 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
    • H02M5/00Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • 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
    • H02M7/53Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/538Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration
    • 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
    • H02M1/0067Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007Plural converter units in cascade
    • 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
    • H02M7/493Conversion 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 the static converters being arranged for operation in parallel
    • 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

Abstract

The present invention relates to a kind of Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverters, its circuit structure is to be made of the shared output filter circuit connection of multiple mutually isolated, with input filter high-frequency inverter circuits and one low-frequency transformer of a multiple input single output, each input terminal of low-frequency transformer couples with the output terminal of each high-frequency inverter circuit one-to-one correspondence, and the output terminal of low-frequency transformer and the input terminal of output filter circuit are connected;This inverter has the characteristics that multiple input sources, and isolation, output and input low frequency isolation, shared output filter circuit, circuit topology are succinctly, single-stage power conversion, voltage matches ability is strong, conversion efficiency is high, output voltage ripple is small, application prospect is extensive altogether, between multiple input sources time sharing power supply, high-frequency inverter circuit altogether or, and the large-capacity distributing electric power system that power supply is combined for a variety of new energy of realization has established key technology.

Description

Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter
Technical field
Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter 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 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 high frequency transformer or high frequency storage transformer 20kHz with When upper, volume, weight greatly reduce, and audio noise also eliminates.Therefore, with dc generator, accumulator, photovoltaic electric Pond and fuel cell etc. are the secondary transformation of electrical energy occasion of main dc power supply, and 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 altogether or uncommon with the power supply of a variety of new energy joint, input DC power the invention aims to provide Ground, transformer have multiple primary side windings and an isolation between vice-side winding, high-frequency inverter circuit, export the low frequency between input Time sharing power supply, circuit topology are succinct in one isolation, multiple input power supply switch periods, share output filter circuit, single-stage work( The features such as rate converts, voltage matches ability is strong, conversion efficiency is high, output voltage ripple is small, output capacity is big, application prospect is extensive Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter.
Technical program of the present invention lies in:A kind of Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inversion Device is the low-frequency transformer by a multiple input single output by multiple mutually isolated, with input filter high-frequency inversions Circuit and a shared output filter circuit connection are formed, each input terminal of multiple input single output low-frequency transformer with it is each The output terminal of high-frequency inverter circuit corresponds connection, the output terminal and output filter circuit of multiple input single output low-frequency transformer Input terminal be connected, described each high-frequency inverter circuit with input filter is by input filter, bidirectional power Stream single-input single-output high-frequency inverter circuit sequentially cascades composition, the output filter circuit be made of output inductor or It is sequentially cascaded by output inductor, output filter capacitor or by output inductor, output filter capacitor, output inductor Form, each bidirectional power flow single-input single-output high-frequency inverter circuit by four-quadrant high frequency power switch and two as Limit for height frequency power switch is formed or is only made of four-quadrant high frequency power switch, and the multiple input source of the inverter is at one Timesharing is to load supplying in the HF switch period.
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 novel Multiple coil time sharing power supply single-stage multi input inverter circuit structure, propose Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit structure and topological race and its energy management control System strategy, i.e., the circuit structure be by provide a kind of low-frequency transformer of multiple input single output by it is multiple it is mutually isolated, carry The high-frequency inverter circuit of input filter and a shared output filter circuit couple.
The Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter of the present invention, can will be multiple unstable Input direct-current voltage be reverse into one load needed for stablize good output alternating current, have multiple input sources not altogether or altogether Ground, transformer have multiple primary side windings and an isolation between vice-side winding, high-frequency inverter circuit, export the low frequency between input Time sharing power supply, circuit topology are succinct in one isolation, multiple input power supply switch periods, share output filter circuit, single-stage work( The spies such as rate converts, voltage matches ability is strong, conversion efficiency is high, output voltage ripple is small, output capacity is big, application prospect is extensive Point.The comprehensive performance of Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter, will be than traditional DC converting Device and the multi input inverter that inverter two-stage cascade forms are superior.
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 voltage-type single-stage multi input low frequency link inverter principle block diagram.
Fig. 5, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit structure chart.
Fig. 6, bipolar SPWM control Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter stable state are former Manage oscillogram.
Fig. 7, Unipolar SPWM control Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter stable state are former Manage oscillogram.
Fig. 8, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology example one ----push away Pull circuit diagram I.
Fig. 9, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology example two ----push away Pull circuit diagram II.
Figure 10, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology example three ----push away Pull circuit diagram III.
Figure 11, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology example four ----push away Draw positive activation type circuit diagram I.
Figure 12, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology example five ----push away Draw positive activation type circuit diagram II.
Figure 13, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology example six ----push away Draw positive activation type circuit diagram III.
Figure 14, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology example seven ----half Bridge circuit schematic diagram I.
Figure 15, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology example eight ----half Bridge circuit schematic diagram II.
Figure 16, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology example nine ----half Bridge circuit schematic diagram III.
Figure 17, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology example ten ----complete Bridge circuit schematic diagram I.
Figure 18, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology example 11 ---- Full bridge circuit schematic diagram II.
Figure 19, Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology example 12 ---- Full bridge circuit schematic diagram III.
Figure 20, output voltage, the input current of Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter Instantaneous values feedback bipolar SPWM principal and subordinate's power distribution energy management control block diagram.
Figure 21, output voltage, the input current of Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter Instantaneous values feedback Unipolar SPWM principal and subordinate's power distribution energy management control block diagram.
Figure 22, output voltage, the input current of Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter Instantaneous values feedback bipolar SPWM principal and subordinate's power distribution energy management control principle oscillogram.
Figure 23, output voltage, the input current of Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter Instantaneous values feedback Unipolar SPWM principal and subordinate's power distribution energy management control principle oscillogram.
Figure 24 has output terminal and connects the Multiple coil time sharing power supply voltage-type single-stage of single-stage isolated Bidirectional charging-discharging converter Multi input low frequency link autonomous power supply system.
Figure 25 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 26, 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.
Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter is by the low of multiple input single output Frequency power transformer is by multiple mutually isolated, with input filter high-frequency inverter circuits and a shared output filter circuit Connection is formed, and each input terminal of multiple input single output low-frequency transformer is corresponded with the output terminal of each high-frequency inverter circuit Connection, the output terminal of multiple input single output low-frequency transformer and the input terminal of output filter circuit are connected, each band Have the high-frequency inverter circuit of input filter by input filter, bidirectional power flow single-input single-output high-frequency inverter circuit according to Sequence cascade is formed, and the output filter circuit is made of output inductor or by output inductor, output filter capacitor Or sequentially cascaded and formed by output inductor, output filter capacitor, output inductor, each bidirectional power flow list The single output high-frequency inverter circuit of input be made of four-quadrant high frequency power switch and two quadrant high frequency powers switch or only by Four-quadrant high frequency power switch is formed, and the timesharing within a HF switch period of the multiple input source of the inverter supplies load Electricity.
It is the functional block diagram of Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter, 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), ZL、uoRespectively single phase ac is passive negative It carries and single phase ac power grid loads, uo、ioRespectively single-phase output alternating voltage and alternating current.It is each it is mutually isolated, carry The high-frequency inverter circuit of input filter by input filter, bidirectional power flow single-input single-output high-frequency inverter circuit sequentially Cascade is formed, and wherein bidirectional power flow single-input single-output high-frequency inverter circuit is high by four-quadrant high frequency power switch and two quadrants Frequency power switch is formed or is only made of four-quadrant high frequency power switch, and MOSFET, IGBT, GTR constant power device can be selected;It is empty In frame the output filter circuit of (" A " is held and union end is in " B " end) be made of output inductor or by output inductor, Output filter capacitor is sequentially cascaded and is formed by output inductor, output filter capacitor, output inductor;The input filter of n roads Wave device is LC wave filters (the filter inductance L of the dashed box containing additioni1、Li2、…、Lin) or the capacitive filter (filter without addition dashed box Wave inductance Li1、Li2、…、Lin), it can be smoother using n roads input direct-current electric current during LC wave filters.N roads high-frequency inverter circuit is by n Road input direct-current voltage source Ui1、Ui2、…、UinIt is modulated into bipolarity binary states or unipolarity of the amplitude with input direct-current voltage change The multilevel SPWM voltage wave of tri-state, through multiple input single output low-frequency transformer T, output inductor LfOr through exporting filtered electrical Feel Lf, output filter capacitor CfOr through output inductor Lf1, output filter capacitor Cf, output inductor Lf2Afterwards in blow-up Stream passive load or single-phase alternating current obtain the sinusoidal voltage u of high quality on the netoOr simple sinusoidal alternating current io, n roads high frequency is inverse Become n input pulse electric current of circuit through input filter Li1-Ci1、Li2-Ci2、…、Lin-CinOr Ci1、Ci2、…、CinAfterwards in n Road input DC power Ui1、Ui2、…、UinIt is middle to obtain smooth input direct-current electric current Ii1、Ii2、…、Iin.It needs to add explanation It is half bridge circuit transformer primary side winding voltage with multiple levels uN11、uN21、…、uNn1Amplitude should be the electricity indicated in Fig. 6,7 The 1/2 of pressure amplitude value, bipolarity binary states multilevel SPWM voltage wave uAB+ 1 state amplitude be Ui1N2/N11、Ui2N2/N21、…、UinN2/ Nn1, -1 state amplitude is Ui1N2/N11It (is designed as here only through the 1st road input source Ui1Feedback exchange side energy, is also designed to Pass through the other any feedback exchange side of input source all the way energy);Unipolarity tri-state multilevel SPWM voltage wave uAB+ 1 state amplitude For Ui1N2/N11、Ui2N2/N21、…、UinN2/Nn1, and -1 state amplitude is-Ui1N2/N11、-Ui2N2/N21、…、-UinN2/Nn1
Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter belongs to voltage-dropping type inverter, n input Source is to loading time sharing power supply.If the output signal I of n-1 input source error amplifier1e、I2e、…、I(n-1)eIt is missed with output voltage The output signal u of poor amplifiereAmplitude be I1em、I2em、I(n-1)em、Uem, saw-toothed carrier signal ucAmplitude be Ucm, then phase The modulation degree answered is m1=I1em/Ucm、m2=I2em/Ucm、…、mn=Uem/Ucm, and have 0≤m1、m2、…、mn≤ 1 and m1< m2 < ... < mn.The principle of the inverter is equivalent to multiple voltage-type single input inverters in the superposition of output end voltage, that is, exports Voltage uoWith input direct-current voltage (Ui1、Ui2、…、Uin), the low-frequency transformer turn ratio (N2/N11、N2/N21、…、N2/Nn1), modulation Spend (m1、m2、…、mn) between relationship be uo=m1Ui1N2/N11+(m2-m1)Ui2N2/N21+…+(mn-mn-1)UinN2/Nn1(monopole Property SPWM controls) or uo=(2m1-1)Ui1N2/N11+(2m2-2m1-1)Ui2N2/N21+…+(2mn-2mn-1-1)UinN2/Nn1It is (bipolar Property SPWM control).For appropriate modulation degree m1、m2、…、mnWith the low-frequency transformer turn ratio (N2/N11、N2/N21、…、N2/Nn1), uoIt can be greater than, equal to or less than the sum of input direct-current voltage Ui1+Ui2+…+Uin, the low-frequency transformer in the inverter not only rises The security reliability and Electro Magnetic Compatibility for improving invertor operation are arrived, it is often more important that play matched output voltage and input The effect of voltage, that is, the output voltage for realizing inverter are higher than, equal to or less than the sum of input direct-current voltage Ui1+Ui2+…+ UinTechnique effect, application range obtained widening significantly.Since there are 0 < m1+(m2-m1)+…+(mn-mn-1) (the lists of < 1 Polarity S PWM is controlled) and 0.5 < m1+(m2-m1)+…+(mn-mn-1) < 1 (bipolar SPWM control), so uo< Ui1N2/N11+ Ui2N2/N21+…+UinN2/Nn1, i.e. output voltage uoAlways less than input direct-current voltage and the low-frequency transformer turn ratio sum of products (Ui1N2/N11+Ui2N2/N21+…+UinN2/Nn1);Since the inverter belongs to single stage circuit structure, transformer has multiple primary winding It is equal to output voltage frequency with an auxiliary winding and working frequency, therefore this kind of inverter is referred to as Multiple coil time sharing power supply voltage-type (voltage-dropping type) single-stage multi input low frequency link inverter.N input source of the inverter can only within a HF switch period Timesharing powers to output loading, and modulation degree can identical (m1=m2=...=mn), it also can difference (m1≠m2≠…≠mn)。
Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter of the present invention, due to sharing one Transformer and an output filter circuit, the traditional multi input inverter formed with DC converter and inverter two-stage cascade There is differences substantially for circuit structure.Therefore, inverter of the present invention has novelty and creativeness, and with defeated Go out with input low frequency isolation, multi input power supply not altogether or altogether, multi input power supply time sharing power supply, circuit topology are succinct, single-stage Power conversion, input voltage preparation are flexibly, conversion efficiency high (meaning that energy loss is small), output voltage ripple is small, export and hold The advantages that big, at low cost, application prospect is extensive is measured, is a kind of ideal energy-saving type single-stage multi input inverter, energetically It advocates and builds energy-saving, conservation-minded society today, with more important value.
Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter circuit topology race embodiment, as Fig. 8,9, 10th, shown in 11,12,13,14,15,16,17,18,19.Push-pull type shown in Fig. 8-16, push-pull ortho-exciting formula and half bridge circuit, often A bidirectional power flow single-input single-output high-frequency inverter circuit is made of two four-quadrant power switch, complete shown in Figure 17-19 Bridge circuit, each bidirectional power flow single-input single-output high-frequency inverter circuit is by two four-quadrant high frequency power switches and two A two quadrants high frequency power switch is formed.It should be added that circuit shown in Fig. 8-19 gives input filter as LC (input filter capacitor of half bridge circuit shown in Figure 14-16 is two bridge arm capacitance C to wave filter situationi11And Ci12、Ci21With Ci22、…、Cin1And Cin2), circuit when not providing input filter as space is limited as capacitive filter;The institute of Fig. 8,11,14,17 The output filter circuit for showing circuit shown in circuit and Figure 10,13,16,19 is respectively to export L, output LCL filter, suitable for simultaneously Net inversion occasion, the output filter circuit of circuit shown in Fig. 9,12,15,18 is output LC wave filters, suitable for off-network inversion field It closes.The power switching voltage of the topological embodiment of four kinds of Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter should Power, as shown in table 1.Push-pull type, push-pull ortho-exciting formula circuit are suitable for high-power low pressure and input inversion occasion, and half bridge circuit is applicable in In middle power high input voltage inversion occasion, full bridge circuit is suitable for high-power high voltage and inputs inversion occasion.The circuit topology race Suitable for by multiple altogether or not input dc power bucklings altogether, unstable change into a required voltage swing, stablize it is high-quality Output alternating current, can be used to realize that a variety of new energy distributions of sigle-stage AC with excellent performance and wide application prospect supply Electric system, such as photovoltaic cell 40-60VDC/220V50HzAC or 115V400HzAC, 10kw Proton Exchange Membrane Fuel Cells 85- 120V/220V50HzAC or115V400HzAC, middle-size and small-size family wind-power electricity generation 24-36-48VDC/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 topological embodiment of four kinds of 1 Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter of table 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.Multiple coil time sharing power supply voltage-type single-stage multi input The energy management control strategy of low frequency link inverter need to be provided simultaneously with energy management, photovoltaic cell and the wind-force hair of input source MPPT, output voltage (electric current) the control three zones of the new energy equipments such as motor, also need to consider filling for accumulator sometimes The smooth and seamless switching of control of discharge and system under different powering modes.Multiple coil time sharing power supply voltage-type single-stage multi input is low Frequency annulus inverter uses two different energy management modes:(1) energy management modes I-- principals and subordinates power distribution mode, Know load needed for power as far as possible by main power supply unit the 1st, 2 ..., n-1 roads input source provide, give the 1st, 2 ..., n-1 roads it is defeated Enter the input current in source, be equivalent to the given 1st, 2 ..., the input power of n-1 roads input source, load required deficit power by It is provided from the n-th road of power supply unit input source, addition batteries to store energy equipment can be not required to;(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 equipment, it is real The requirement that grid-connected system makes full use of the energy is showed, if in output terminal and connecing an accumulator cell charging and discharging device and can also be achieved The stabilization of autonomous power supply system output voltage (electric current).When n roads new energy input voltage to timing, by control the 1st, 2nd ..., the input current of n roads input source, be equivalent to control the 1st, 2 ..., the input power of n roads input source.
Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter, 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 20,21,22,23.1st, 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 circuitgs11(ugs14)、ugs12(ugs13)、…、ugsn1(ugsn4)、ugsn2 (ugsn3).As bearing power PoMore than the 1st, 2 ..., the sum of the maximum power of n-1 roads input source when, output voltage uoReduce, electricity Press regulator 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-1Block, 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 The maximum power output of road input source, the n-th road voltage regulator are used to implement the stabilization of inverter output voltage, n roads input source Timesharing 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 uo Increase, as regulated output voltage ueVirtual value be reduced to threshold comparative level UtWhen following, diode Dn-1Conducting, D1、D2、…、Dn-2Still block, stagnant ring comparison circuit n+1 exports low level, and the n-th road input source stops power supply, voltage regulator with Current regulator form double closed-loop control system, the 1st, 2 ..., n-1 roads input source in a switch periods timesharing to load supply Electricity, 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 reduction (being 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.When When input voltage or load variation, by adjusting reference voltage urOr feedback voltage uofTo change error voltage signal ︱ ue︳ and mistake Difference current signal ︱ i1e︳, ︳ i2e︱ ..., ︳ i(n-1)e︱, so as to change modulation degree m1、m2、…、mn, therefore can realize that the inverter is defeated Go out voltage, the adjusting of input current (output power) and stabilization.
When the n-th roads of Figure 20-23 Zhong input source is designed as input current feedback, then it is anti-to may make up input current instantaneous value Present bipolar SPWM, Unipolar SPWM maximum power output energy management control strategy.Inverter the 1st, 2 ..., the input on n roads Current feedback signal Ii1f、Ii2f、…、IinfRespectively with the 1st, 2 ..., the reference current that is obtained after MPPT is calculated of n roads input source Signal Ii1r、Ii2r、…、IinrCompare amplification, error amplification signal I through pi regulator1e、I2e、…、IneLetter synchronous with sine respectively Number be multiplied through absolute value circuit 1,2 ..., after n ︱ i1e︳, ︳ i2e︱ ..., ︳ ine︱, ︱ i1e︳, ︳ i2e︱ ..., ︳ ine︱ respectively with carrier wave ucHand over the control signal that cuts and must be switched after output voltage gating signal and logic circuit.1st, 2 ..., n roads current regulator point It does not work independently, realizes each input source maximum power output, n roads input source, which is combined, to power to the load.
Figure 22, bipolarity shown in 23, Unipolar SPWM control principle waveform have marked HF switch cycle TSWith a certain height Frequency switch periods TSInterior 1st, 2 ..., the turn-on time T of n roads input sourceon1、Ton2、…、TonnAnd total turn-on time Ton= Ton1+Ton2+…+Tonn, total turn-on time TonWithin an output voltage period changed by sinusoidal rule.In addition, for Half bridge circuit I, II, III shown in Figure 14,15,16, should be by half of input direct-current voltage value (Ui1/2、Ui2/2、…、Uin/ 2) generation Enter into voltage transfer ratio formula and calculated.
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 24.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 25.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 26.For output filter capacitor Cf、Cf' and load ZLFor, Multiple coil time sharing power supply voltage-type single-stage multi input is low The output terminal of frequency annulus inverter and single-stage isolated Bidirectional charging-discharging converter simultaneously connects the superposition in parallel for being equivalent to two current sources. The energy management control strategy as shown in Figure 25 is it is found that Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter 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, out of phase difference θ means to export different size and direction active power. Work as Po=P1max+P2max+…+PnmaxWhen, θ=90 °, the active power of charge/discharge transformation device output is zero, in light condition; Work as Po>P1max+P2max+…+PnmaxWhen, uoReduce, 90 ° of θ <, charge/discharge transformation device active power of output, energy storage device is to load Electric discharge, i.e. energy storage device provide the deficit power needed for load;Work as Po< P1max+P2max+…+PnmaxWhen, uoIncrease, 90 ° of θ >, The negative active power of charge/discharge transformation device output, loads the dump power to energy storage device feedback energy, the i.e. output of multiple input source It charges, is loaded when θ=180 ° maximum to the energy of energy storage device feedback to energy storage device.Therefore, energy management control plan Summary can be according to PoWith P1max+P2max+…+PnmaxRelative size control the power of single-stage isolated Bidirectional charging-discharging converter in real time Size and Orientation is flowed, realizes smooth and seamless switching of the system under three kinds of different powering modes.

Claims (3)

1. a kind of Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter, it is characterised in that:This inverter It is the low-frequency transformer by a multiple input single output by multiple mutually isolated, with input filter high-frequency inverter circuits Couple with a shared output filter circuit and form, each input terminal and each high frequency of multiple input single output low-frequency transformer The output terminal of inverter circuit corresponds connection, the output terminal of multiple input single output low-frequency transformer and output filter circuit it is defeated Enter end to be connected, each high-frequency inverter circuit with input filter is by input filter, bidirectional power flow list The single output high-frequency inverter circuit of input sequentially cascades composition, and the output filter circuit is made of output inductor or by defeated Go out filter inductance, output filter capacitor or structure is sequentially cascaded by output inductor, output filter capacitor, output inductor Into each bidirectional power flow single-input single-output high-frequency inverter circuit is by four-quadrant high frequency power switch and two quadrants High frequency power switch is formed or is only made of four-quadrant high frequency power switch, and the multiple input source of the inverter is in a height Timesharing is to load supplying in frequency switch periods.
2. Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter according to claim 1, feature It is:The circuit topology of the Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter is push-pull type, recommends Positive activation type, semibridge system, full bridge circuit.
3. Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter according to claim 1, feature It is:The output terminal of the Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter 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.
CN201810019754.XA 2018-01-09 2018-01-09 Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter Withdrawn CN108199598A (en)

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