CN108092538A - Parallel Time-sharing is for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter - Google Patents

Parallel Time-sharing is for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter Download PDF

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Publication number
CN108092538A
CN108092538A CN201810020151.1A CN201810020151A CN108092538A CN 108092538 A CN108092538 A CN 108092538A CN 201810020151 A CN201810020151 A CN 201810020151A CN 108092538 A CN108092538 A CN 108092538A
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output
flyback
input
chopper
chopped
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CN201810020151.1A
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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
    • 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
    • H02M3/33592Conversion 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 having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • 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
    • H02M7/53871Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • 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

Abstract

The present invention relates to a kind of Parallel Time-sharing for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter, its circuit structure is to combine the two-way flyback dc chopper of isolation by a multiple input single output to form multiple input filters and a shared output filter circuit connection altogether, multiple input single output combination is isolated each input terminal of two-way flyback dc chopper and is coupled with the output terminal one-to-one corresponding of each input filter, and the output terminal that two-way flyback dc chopper is isolated in multiple input single output combination is connected with output filter circuit.This inverter have the characteristics that multiple input sources altogether, time sharing power supply, output and input electrical isolation, circuit topology is succinct, single-stage power conversion, power density are high, conversion efficiency is high, load short circuits when reliability is high, output capacity is small, application prospect is extensive, the low capacity distributed power supply system to realize a variety of new energy joint power supplies has established key technology.

Description

Parallel Time-sharing is for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter
Technical field
Parallel Time-sharing according to the present invention belongs to electric power for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter 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 isolate 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 Conversion, 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, it is necessary to have the new of single stage circuit structure shown in Fig. 3 Type multi input inverter substitutes Fig. 1,2 shown traditional multi inputs with DC converter with inverter two-stage cascade circuit structure Inverter forms new 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.New 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 cycle or timesharing is supplied to load The advantages that electric, at low cost.
Therefore, 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 are actively sought 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.
The content of the invention
The invention aims to provide it is a kind of have the power supply of a variety of new energy joint, input DC power altogether, multi input Single output combination isolate two-way flyback dc chopper set between multi-channel parallel timesharing selecting switch, output and input electrically every Power to the load from, multiple input power supply timesharing, circuit topology is succinct, single-stage power conversion, conversion efficiency are high, load short circuits when The Parallel Time-sharing for the features such as reliability is high, output capacity is small, application prospect is extensive is more for being electrically isolated flyback DC chopped-wave type single-stage Input inverter.
Technical program of the present invention lies in:A kind of Parallel Time-sharing is for being electrically isolated flyback DC chopped-wave type single-stage multi input inversion Device, it is characterised in that:This inverter be the two-way flyback dc chopper of isolation is combined by a multiple input single output will be multiple Input filter and a shared output filter circuit connection altogether is formed, and two-way flyback is isolated in multiple input single output combination The output terminal one-to-one corresponding of each input terminal of dc chopper and each input filter couple, multiple input single output combine every Output terminal from two-way flyback dc chopper is connected with output filter circuit, and multiple input single output combination isolation is double Combine to flyback dc chopper by multi-channel parallel timesharing selection four-quadrant power switch circuit, single-input single-output isolate it is two-way Flyback dc chopper sequentially cascades composition, multi-channel parallel timesharing selection four-quadrant power switch circuit per all the way only It is made of a four-quadrant power switch and each road output terminal connects together, single-input single-output combination isolation is two-way Flyback dc chopper is by two identical, output low frequency positive half cycle and low frequency negative half period unipolar PWM current waves respectively The two-way flyback dc chopper input terminal parallel outputs of isolation be reversely connected in series to form, and two two-way flyback direct currents of isolation Two output terminals of the non-series connection of chopper isolate the output terminal of two-way flyback dc chopper for multiple input single output combination, each The two-way flyback dc chopper of the isolation is by two quadrant high-frequency inversion switches, storage transformer, two quadrants of rectification High frequency power switchs and polarity selection sequentially cascades composition with the hf rectifier that two quadrant high frequency powers switch is formed, described Output filter circuit is made of filter capacitor or is sequentially cascaded and formed by filter capacitor, filter inductance.
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 parallel timesharing selecting switch, Parallel Time-sharing is proposed for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter circuit structure and topological race and its energy Management and controlling tactics, the i.e. circuit structure are to isolate two-way flyback dc chopper by providing a kind of multiple input single output combination Multiple input filters and a shared output filter circuit altogether is coupled.
The Parallel Time-sharing of the present invention, can will be multiple common for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter Ground, unstable input direct voltage, which are reverse into needed for a load, stablizes good output alternating current, straight with multi input Galvanic electricity source is altogether, output powers to the load with input electrical isolation, multi input power supply timesharing, circuit topology is succinct, single stage power It converts, conversion efficiency is high, change range of input voltage is wide, it is small to load reliability height, output capacity when overloading and is short-circuit, before The features such as scape is extensive.Parallel Time-sharing, will be than passing for the comprehensive performance of electric isolution flyback DC chopped-wave type single-stage multi input inverter The DC converter of system 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, new single-stage multi input inverter principle block diagram.
Fig. 4, Parallel Time-sharing is for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter principle block diagram.
Fig. 5, Parallel Time-sharing is for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter circuit structure chart.
Fig. 6, output voltage instantaneous value SPWM control Parallel Time-sharing are inverse for being electrically isolated flyback DC chopped-wave type single-stage multi input Become device steady principle oscillogram.
Fig. 7, Parallel Time-sharing is for being electrically isolated 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, Parallel Time-sharing is for being electrically isolated 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, Parallel Time-sharing is for being electrically isolated 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, Parallel Time-sharing is for being electrically isolated 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, Parallel Time-sharing power supply single hose and double hose isolate the defeated of flyback DC chopped-wave type single-stage multi input inverter Go out voltage, input current instantaneous value SPWM principals and subordinates power distribution energy management control block diagram.
Figure 12, Parallel Time-sharing power supply single hose and double hose isolate the defeated of flyback DC chopped-wave type single-stage multi input inverter Go out voltage, input current instantaneous value SPWM principals and subordinates power distribution energy management control principle oscillogram.
Figure 13, Parallel Time-sharing power supply paralleling and interleaving single hose and paralleling and interleaving double hose isolation flyback DC chopped-wave type single-stage Output voltage, the input current instantaneous value SPWM principals and subordinates power distribution energy management control block diagram of multi input inverter.
Figure 14, Parallel Time-sharing power supply paralleling and interleaving single hose and paralleling and interleaving double hose isolation flyback DC chopped-wave type single-stage The output voltage of multi input inverter, input current instantaneous value SPWM principals and subordinates power distribution energy management control principle oscillogram.
Figure 15 has output terminal and connects the Parallel Time-sharing of single-stage isolated Bidirectional charging-discharging converter for being electrically isolated flyback direct current 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
Technical scheme is described further with reference to Figure of description and embodiment.
Parallel Time-sharing is by a multiple input single output group for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter It closes and isolates two-way flyback dc chopper by multiple input filters and a shared output filter circuit connection structure altogether Into each input terminal of two-way flyback dc chopper and the output terminal of each input filter are isolated in multiple input single output combination Connection is corresponded, the output terminal that two-way flyback dc chopper is isolated in multiple input single output combination is connected with output filter circuit It connects, multiple input single output combination is isolated two-way flyback dc chopper and opened by multi-channel parallel timesharing selection four-quadrant power Powered-down road, single-input single-output combination isolate two-way flyback dc chopper and sequentially cascade composition, the multi-channel parallel timesharing Selection four-quadrant power switch circuit per being only made of all the way a four-quadrant power switch and each road output terminal is attempted by one It rises, single-input single-output combination isolates two-way flyback dc chopper by two identical, output low frequency just half respectively The two-way flyback dc chopper input terminal parallel outputs of isolation of week and low frequency negative half period unipolar PWM current wave are anti- To in series, and two output terminals of two two-way non-series connection of flyback dc chopper of isolation are multiple input single output combination Isolate the output terminal of two-way flyback dc chopper, each two-way flyback dc chopper of isolation is by two quadrant high frequencies Inverse switch, storage transformer, rectification is switched with two quadrant high frequency powers and polarity selection is switched with two quadrant high frequency powers The hf rectifier of composition sequentially cascades composition, and the output filter circuit is made of filter capacitor or by filter capacitor, filter Ripple inductance sequentially cascades composition.
Parallel Time-sharing is for being electrically isolated the functional block diagram of flyback DC chopped-wave type single-stage multi input inverter, circuit structure, defeated Go out steady principle waveform during instantaneous voltage SPWM controls, respectively as shown in Figure 4,5, 6.In Fig. 4,5,6, Ui1、Ui2、…、Uin For n roads input dc power potential source (n is the natural number more than 1), ZLFor single-phase output AC load, uo、ioRespectively single-phase output Alternating voltage (including ac grid voltage) and alternating current.Two-way flyback dc chopper is isolated in multiple input single output combination Combine by multi-channel parallel timesharing selection four-quadrant power switch circuit, single-input single-output isolate two-way flyback dc chopper according to Sequence cascade is formed, and is equivalent to a bidirectional power flow single-input single-output combination at any time and is isolated two-way flyback DC chopped-wave Device.Wherein, multi-channel parallel timesharing selection four-quadrant power switch circuit is every all the way only by a four-quadrant power switch Ssi(i =1,2 ..., n) form and each road output terminal connect together;Two-way flyback dc chopper is isolated in single-input single-output combination, It is two-way anti-by two identical, output low frequency positive half cycle and low frequency negative half period unipolar PWM current wave respectively isolation Sharp DC chopper input terminal parallel outputs are reversely connected in series to form that (two two-way flyback dc choppers of isolation are in a low frequency It takes turns to operate in the output voltage cycle 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 turned on two quadrant power switch, io2=0 and uo2=0, through output Sinusoidal ac u is exported after wave filterO、iOPositive half cycle;Conversely, when dc chopper works output low frequency negative half period io2, and another dc chopper is stopped and polarity selection is turned on two quadrant power switch, io1=0 and uo1=0, warp Sinusoidal ac u is exported after output filterO、iONegative half period.), and two two-way non-series connection of flyback dc chopper of isolation Two output terminals isolate the output terminal of two-way flyback dc chopper for multiple input single output combination, each isolation is double It is switched to flyback dc chopper by two quadrant high-frequency inversion switches, storage transformer, two quadrant high frequency powers of rectification And polarity selection sequentially cascades composition with the hf rectifier that two quadrant high frequency powers switch is formed, optional 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 wave filter suitable for passive AC load and the output capacitance electricity suitable for AC network load are depicted in figure 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.N inputs the high-frequency inversion that single output combination is isolated in two-way flyback dc chopper and switchs n Road input dc power potential source Ui1、Ui2、…、UinIt is modulated into the unipolarity tri-state multi slope SPWM that amplitude is distributed by sinusoidal envelope line Current wave ii1、ii2, through storage transformer T1、T2Isolation and hf rectifier are rectified into the list that amplitude is distributed by sinusoidal envelope line Polarity tri-state single-slope SPWM current waves io1、io2, in single phase ac passive load or single-phase alternating current after output filter capacitor The online sinusoidal voltage u for obtaining high qualityoOr simple sinusoidal alternating current io, the two-way flyback direct current of the single output combination isolation of n inputs N input pulse electric current of chopper is 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.If export sinusoidal voltage Virtual value is Uo, storage transformer primary side winding number of turn N11=N21=N13=N23=N1, vice-side winding number of turn N12=N22= N14=N24=N2, the inductance of former and deputy side winding is respectively L1、L2, then bipolarity binary states multilevel SPWM voltage wave u12、u22Width It is worth and isWith-(Ui1、Ui2、…、Uin)N2/N1, unipolarity tri-state multilevel SPWM current wave ii1、ii2The rate of rise be respectively Ui1/L1、Ui2/L1、…、Uin/L1, unipolarity tri-state list level SPWM current wave io1、io2Descending slope be-uo/L2
Parallel Time-sharing belongs to voltage boosting/reducing inverter for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter, and n is a Input source timesharing powers to the load, and principle is equivalent to the magnetic flux that multiple input source generates in storage transformer or in energy storage The superposition for the current increment that formula transformer primary side inductance generates.If power selector switch Ss1、Ss2、…、SsnDuty cycle be respectively d1、d2、…、dn, magnetic flux is approximately equal to according to the incrementss of magnetic flux in one HF switch cycle during storage transformer stable state Decrement can derive output voltage uoWith input direct voltage (Ui1、Ui2、…、Uin), the storage transformer turn ratio (N2/N1)、 Duty cycle (d1、d2、…、dn) between relation, i.e. uo=(d1Ui1+d2Ui2+…+dnUin)N2/[N1(1-d1-d2-…-dn)].It is right In appropriate duty cycle (d1、d2、…、dn) and the storage transformer turn ratio (N2/N1), uoIt can be greater than, equal to or less than input The sum of DC voltage Ui1+Ui2+…+Uin, the storage transformer in the inverter not only plays the peace for improving invertor operation Full reliability and Electro Magnetic Compatibility, it is often more important that play the role of matched output voltage and input voltage, that is, realize inverse The output voltage for becoming device is higher than, equal to or less than the sum of input direct voltage Ui1+Ui2+…+UinTechnique effect, apply model It encloses to have obtained and widen significantly.As 0.5 < d1+d2+…+dn1 or 0 < d of <1+d2+…+dnDuring < 0.5, u is respectively presento> (Ui1+ Ui2+…+Uin)N2/N1Or uo< (Ui1+Ui2+…+Uin)N2/N1, i.e. output voltage uoHigher or lower than input direct voltage (Ui1、 Ui2、…、Uin) and the storage transformer turn ratio (N2/N1) the sum of products (Ui1+Ui2+…+Uin)N2/N1;Due to the inverter Belong to single stage circuit structure, there are storage transformers to isolate for output and input, the two-way flyback of multiple input single output combination isolation The multi-channel parallel timesharing selection power switch circuit that dc chopper is provided with output terminal and connects, therefore this kind of inverter is known as simultaneously Join time sharing power supply isolation flyback DC chopped-wave type (buck-boost type) single-stage multi input inverter.There are high frequency magnetic for storage transformer Reset and two kinds of working methods of low frequency magnetic reset, the former is that storage transformer realizes that magnetic flux is answered within a HF switch cycle Position, for power reverse flow is avoided to can only operate in critical CCM patterns and uses PFM control strategies, no audio noise belongs to high Frequency annulus inverter;The latter is that storage transformer realizes magnetic-reset within an output low frequency cycle, is operated in CCM patterns With constant frequency SPWM control strategies, there is audio noise, be not belonging to annulus inverter in high frequency.N input source timesharing pair of the inverter AC load power supply is exported, duty cycle can identical (d1=d2=...=dn), it can not also be with (d1≠d2≠…≠dn)。
Parallel Time-sharing of the present invention is for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter, due to sharing one Two-way flyback dc chopper and an output filter circuit are isolated in a multiple input single output combination, with DC converter and inversion There is differences substantially for the circuit structure for traditional multi input inverter that device two-stage cascade is formed.Therefore, it is of the present invention Inverter has novelty and creativeness, and is opened up with output and input electrical isolation, multi input power supply time sharing power supply, circuit Flutter succinct, single-stage power conversion, buck than it is big, change range of input voltage is wide, input voltage prepares that flexible, conversion efficiency is high Reliability is high, output capacity is small when (meaning that energy loss is small), load overload and short circuit, at low cost, application prospect is extensive etc. Feature is a kind of preferably energy-saving type single-stage multi input inverter, and vigorously advocating, construction is energy-saving, conservation-minded society Today, with more important value.
Parallel Time-sharing for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter circuit topology race embodiment, as Fig. 7, 8th, shown in 9,10.In circuit shown in Fig. 7-10, the output terminal and multi-channel parallel timesharing that connects selects four-quadrant power switch circuit by n A four-quadrant high frequency power switch composition that can bear bi-directional voltage stress, bidirectional current stress, and single-input single-output combines Isolate two-way flyback dc chopper by it is multiple can bear unidirectional voltage stress, two quadrant high frequency powers of bidirectional current stress are opened (some circuits also contain power diode) realization is closed, single-input single-output combination isolates two in two-way flyback dc chopper Isolate two-way flyback dc chopper to take turns to operate half of low frequency output cycle.Precisely, single switch flyback direct current shown in Fig. 7 is cut Wave mode circuit, be bi-directional voltage stress can be born by n, the four-quadrant high frequency power switch of bidirectional current stress and 6 can hold It is switched to realize by two quadrant high frequency powers of unidirectional voltage stress, bidirectional current stress;Double-transistor flyback DC chopped-wave shown in Fig. 8 Type circuit, be bi-directional voltage stress can be born by n, the four-quadrant high frequency power switch of bidirectional current stress and 8 can bear Unidirectional voltage stress, the two quadrant high frequency powers switch of bidirectional current stress and 4 diodes 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 work(that can bear bi-directional voltage stress, bidirectional current stress by n Rate switchs and 10 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 n to show paralleling and interleaving double-transistor flyback DC chopped-wave type circuit Limit for height frequency power switch and 14 can bear unidirectional voltage stress, the two quadrant high frequency powers switch of bidirectional current stress and 8 Diode is realized.It should be added that circuit shown in Fig. 7-10 gives input filter as LC wave filter situations, limit Circuit when input filter is capacitive filter situation is not provided in length;Circuit shown in Fig. 7-10 is only depicted suitable for nothing The circuit diagram of the output capacitance wave filter of source AC load, and it is not drawn into being suitable for the output capacitance inductance filter of AC network load The circuit diagram of ripple device.Parallel Time-sharing is opened for being electrically isolated the power of flyback DC chopped-wave type single-stage multi input inverter topology embodiment Powered-down compression, as shown in table 1.In table 1, Uimax=max (Ui1, Ui2..., Uin), N=1,2 ..., n, UoFor the sinusoidal electricity of output Press uoVirtual value.Single hose, paralleling and interleaving single hose circuit are suitable for small-power low pressure and input inversion occasion, double hose, simultaneously Connection interlocks double hose circuit suitable for low-power high-voltage input inversion occasion.The circuit topology race be suitable for by it is multiple altogether, no Stable input direct voltage is transformed into a required voltage swing, stablizes good output alternating current, and can be used to realize has Excellent performance and a variety of new energy distributed power supply systems of the sigle-stage AC of 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 generating 510VDC/ The multiple input sources such as 220V50HzAC or 115V400HzAC power to AC load or AC network.
1 Parallel Time-sharing of table is for the power switch of electric isolution flyback DC chopped-wave type single-stage multi input inverter topology embodiment Voltage stress
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 cycles be controlled, that is, there are multiple controls Degree of freedom, this energy management just for a variety of new energy provide possibility.Parallel Time-sharing is for being electrically isolated flyback DC chopped-wave type The energy management control strategy of single-stage multi input inverter need to be provided simultaneously with energy management, photovoltaic cell and the wind-force of input source MPPT, output voltage (electric current) the control three zones of the new energy equipments such as generator, also need to consider accumulator sometimes The smooth and seamless switching of charge and discharge control and system under different powering modes.Parallel Time-sharing is for being electrically isolated flyback DC chopped-wave type Single-stage multi input inverter uses two kinds of different energy management modes:(1) energy management modes I-- principals and subordinates power distribution side Formula, it is known that power needed for load as far as possible by main power supply unit the 1st, 2 ..., n-1 roads input source provide, give the 1st, 2 ..., n- The input current of 1 road input source, be equivalent to the given 1st, 2 ..., the input power of n-1 roads input source, load required insufficient work( Rate can be not required to addition batteries to store energy equipment by being provided from the n-th road of power supply unit input source;(2) energy management modes II- Maximum power output mode, the 1st, 2 ..., n roads input source with maximum power output to load, eliminate batteries to store energy and set It is standby, the requirement that grid-connected system makes full use of the energy is realized, if in output terminal and connecing an accumulator cell charging and discharging device also The stabilization of autonomous power supply system output voltage (electric current) can be achieved.When n roads new energy input voltage to timing, pass through control 1st, 2 ..., the input current of n roads input source, be equivalent to control the 1st, 2 ..., the input power of n roads input source.
Magnetic-reset is realized within an output low frequency cycle with storage transformer, is operated in CCM patterns and using permanent Exemplified by frequency SPWM control strategies, the energy management control strategy of this kind of inverter is discussed.Parallel Time-sharing is for being electrically isolated flyback direct current Chopper-type single-stage multi input inverter is using output voltage, the distribution energy management control of input current instantaneous value SPWM principals and subordinates power Strategy, to form autonomous power supply system;Or input current instantaneous value SPWM maximum power output energy management control strategies are used, To 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 Deficit power output voltage, input current instantaneous value SPWM principals and subordinates power distribution energy management control block diagram and control principle Waveform, respectively as shown in Figure 11,12,13,14.Figure 11,12 for single hose and double hose circuit topology control program, Figure 13, 14 be the control program of paralleling and interleaving single hose and paralleling and interleaving double hose circuit topology, and the two is inherently quite similar 's.The basic thought of the control program is that the high-frequency inversion that the single output combination of n inputs is isolated in two-way flyback dc chopper is opened It closes n roads input dc power potential source Ui1、Ui2、…、UinIt is modulated into the unipolarity tri-state multi slope that amplitude is distributed by sinusoidal envelope line SPWM current waves ii1、ii2, the 1st, 2 ..., n-1 roads selection power switch ON time be according to error current size and benchmark The product of sinusoidal synchronizing signal and sawtooth waveforms friendship intercept and capture (realize the 1st, 2 ..., the maximum power output of n-1 roads input source), the The ON time of n roads selection power switch is to intercept and capture according to error voltage size and sawtooth waveforms friendship and (realize the n-th road input source work( Rate is supplied), n roads select the ON time T of power switchon1、Ton2、…、TonnThe sum of be inverse switch ON time Ton, Through storage transformer T1、T2Isolation and hf rectifier are rectified into the unipolarity tri-state monocline that amplitude is distributed by sinusoidal envelope line Rate SPWM current waves io1、io2, the sinusoidal voltage u of high quality is obtained after filteredoOr simple sinusoidal alternating current io;Pass through adjusting Output voltage error signal realizes the stabilization of inverter output voltage, which is suitable for circuit shown in Fig. 7-10.The 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, inversion Device the 1st, 2 ..., the input current feedback signal I on n-1 roadsi1f、Ii2f、…、Ii(n-1)fRespectively with the 1st, 2 ..., the quasi- electricity of n-1 roadbeds Flow signal Ii1r、Ii2r、…、Ii(n-1)rCompare amplification through proportional and integral controller, the error signal I being exaggerated1e、I2e、…、 I(n-1)eI is obtained after being multiplied respectively with reference sinusoidal synchronizing signal1e、i2e、…、i(n-1)eAnd inversion signal-i1e、-i2e、…、- i(n-1)e, the output voltage feedback signal u of inverterofWith reference sinusoidal voltage urCompare amplification through proportional and integral controller to obtain Voltage error amplified signal ue, i1e、i2e、…、i(n-1)e、ue、-i1e、-i2e、…、-i(n-1)e、-ueRespectively with unipolarity sawtooth Shape carrier wave ucCompare, consider output voltage polarity selection signal and Fig. 7, single shown in 8 is obtained after appropriate combinational logic circuit The power switch control signal u of tubular type and double hose circuit topologygss1、ugss2、…、ugssn、ugs11(ugs′11)、ugs13、ugs21 (ugs′21)、ugs23、ugs15、ugs25Or Fig. 9, the power of paralleling and interleaving single hose and paralleling and interleaving double hose circuit topology shown in 10 Switch controlling signal ugss1、ugss2、…、ugssn、ugs11(ugs′11)、ugs12(ugs′12)、ugs13、ugs14、ugs21(ugs′21)、ugs22 (ugs′22)、ugs23、ugs24、ugs15、ugs25, Fig. 8, double hose shown in 10 and paralleling and interleaving double hose circuit storage transformer Leakage inductance energy is by feeding back to the n-th road input source UinIt designs, is also designed to feed back to other road input sources).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 cycle d1、d2、…、dn, therefore can realize the inverter output voltage, input current The adjusting of (output power) and stabilization.
Carry out control input electric current when the n-th roads of Figure 11-14 Zhong input source is designed as input current feedback, then constitute 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 ON time T of n roads input sourceon1、Ton2、…、TonnWith the ON time T of inverse switchon=Ton1+Ton2+…+Tonn, The ON time T of inverse switchonWithin an output voltage cycle changed by sinusoidal rule.When energy is negative from output exchange It carries side and feeds back to input dc power source, it is necessary to which double hose, paralleling and interleaving double hose circuit primary side is avoided positive activation type work occur Situation, the turn ratio of storage transformer must are fulfilled for
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 need to configure energy storage device, to realize the stabilization of output voltage, i.e., inverter output terminal 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 transfer (energy storage device electric discharge), back transfer (energy storage device charging) energy is positive When, a single-stage high frequency link DC-AC converter and a single-stage high frequency link AC-DC converter are equivalent to 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 Charge -- 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, Parallel Time-sharing is for being electrically isolated flyback DC chopped-wave type list The parallel connection that the output terminal and connecing of grade multi input inverter and single-stage isolated Bidirectional charging-discharging converter is equivalent to two current sources is folded Add.Energy management control strategy is understood as shown in Figure 16, and Parallel Time-sharing is inverse for being electrically isolated flyback DC chopped-wave type single-stage multi input Become the output current i of deviceLfFundametal compoment and output voltage uoWith the same phase of frequency, active power of output;And charge/discharge transformation device is Pass through output voltage uoWith reference voltage uorefError amplification signal uoeWith high frequency carrier the SPWM signals for cutting generation is handed over to carry out Control, output inductor electric current iLf' and uoBetween there are phase difference θ, out of phase difference θ mean export different size With direction active power.Work as Po=P1max+P2max+…+PnmaxWhen, θ=90 °, charge/discharge transformation device output active power be 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. a kind of Parallel Time-sharing is for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter, it is characterised in that:This inversion Device is to be combined to isolate two-way flyback dc chopper by multiple input filters altogether and one by a multiple input single output Shared output filter circuit connection is formed, and each input terminal of two-way flyback dc chopper is isolated in multiple input single output combination Couple with the output terminal one-to-one corresponding of each input filter, two-way flyback dc chopper is isolated in multiple input single output combination Output terminal is connected with output filter circuit, and multiple input single output combination isolates two-way flyback dc chopper by multichannel Parallel Time-sharing selection four-quadrant power switch circuit, single-input single-output combination are isolated two-way flyback dc chopper and are sequentially cascaded It forms, the multi-channel parallel timesharing selects the every all the way only by a four-quadrant power switch structure of four-quadrant power switch circuit Into and each road output terminal connect together, single-input single-output combination isolates two-way flyback dc chopper by two phases With, the two-way flyback DC chopped-wave of isolation of output low frequency positive half cycle and low frequency negative half period unipolar PWM current wave respectively Device input terminal parallel outputs are reversely connected in series to form, and two outputs of two two-way non-series connection of flyback dc chopper of isolation Hold the output terminal for isolating two-way flyback dc chopper for multiple input single output combination, each two-way flyback direct current of isolation Chopper is switched by two quadrant high-frequency inversion switches, storage transformer, rectification with two quadrant high frequency powers and polarity selection The hf rectifier formed with two quadrant high frequency powers switch sequentially cascades composition, and the output filter circuit is by filter capacitor It forms or is sequentially cascaded and formed by filter capacitor, filter inductance.
2. Parallel Time-sharing according to claim 1 is for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter, special Sign is:The Parallel Time-sharing is single switch flyback for the circuit topology for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter 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 direct current Chopper-type circuit.
3. Parallel Time-sharing according to claim 1 is for being electrically isolated flyback DC chopped-wave type single-stage multi input inverter, special Sign is:The Parallel Time-sharing is for being electrically isolated the output terminal of flyback DC chopped-wave type single-stage multi input inverter and connecing an energy storage The single-stage isolated Bidirectional charging-discharging converter of equipment, to form the autonomous power supply system of an output voltage stabilization;The list Grade isolation Bidirectional charging-discharging converter is filtered by input filter, high-frequency inverter, high frequency transformer, frequency converter, output Device sequentially cascades composition, and the frequency converter is by that can bear the four-quadrant high frequency of bi-directional voltage stress and bidirectional current stress Power switch is formed;Multiple input source is operated in maximum power output mode, maximum according to bearing power and multiple input source The relative size of the sum of power controls the power flow size and Orientation of single-stage isolated Bidirectional charging-discharging converter in real time, realizes system Output voltage stabilization and the switching of the smooth and seamless of energy storage device charge and discharge.
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CN110620517A (en) * 2019-09-27 2019-12-27 中南大学 Parallel input and serial output aging power supply device
CN113541448A (en) * 2021-07-22 2021-10-22 山东鲁软数字科技有限公司智慧能源分公司 Magnetic isolation multi-input multi-output flexible direct current power transmission supply circuit

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Publication number Priority date Publication date Assignee Title
CN101534055A (en) * 2009-04-14 2009-09-16 福州大学 Single-isolation pressure increase and reduction type multi-input direct current converter

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Publication number Priority date Publication date Assignee Title
CN101534055A (en) * 2009-04-14 2009-09-16 福州大学 Single-isolation pressure increase and reduction type multi-input direct current converter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110620517A (en) * 2019-09-27 2019-12-27 中南大学 Parallel input and serial output aging power supply device
CN110620517B (en) * 2019-09-27 2021-08-17 中南大学 Parallel input and serial output aging power supply device
CN113541448A (en) * 2021-07-22 2021-10-22 山东鲁软数字科技有限公司智慧能源分公司 Magnetic isolation multi-input multi-output flexible direct current power transmission supply circuit

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