CN108054946A - Built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter - Google Patents
Built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter Download PDFInfo
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- CN108054946A CN108054946A CN201810019207.1A CN201810019207A CN108054946A CN 108054946 A CN108054946 A CN 108054946A CN 201810019207 A CN201810019207 A CN 201810019207A CN 108054946 A CN108054946 A CN 108054946A
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- 238000002955 isolation Methods 0.000 claims abstract description 16
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- 238000005516 engineering process Methods 0.000 abstract description 3
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- 238000011217 control strategy Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 8
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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- H02J3/382—
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- H02J3/387—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/501—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode sinusoidal output voltages being obtained by the combination of several pulse-voltages having different amplitude and width
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/538—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration
- H02M7/53803—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
Abstract
The present invention relates to a kind of built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverters, its circuit structure is to be made of multiple input filters and a shared output low frequency isolation voltage transformation filter circuit connection altogether the multiple input single output high-frequency inverter circuit of a built-in Parallel Time-sharing selection four-quadrant power switch, each input terminal of multiple input single output high-frequency inverter circuit couples with the output terminal one-to-one corresponding of each input filter, the input terminal that the output terminal of multiple input single output high-frequency inverter circuit isolates voltage transformation filter circuit with output low frequency is connected.This inverter has the characteristics that multiple input sources altogether and time sharing power supply, output are with inputting low frequency isolation, shared output low frequency voltage transformation filter circuit, circuit topology is succinct, single-stage power conversion, conversion efficiency are high, output voltage ripple is small, application prospect is extensive, and key technology has been established to realize that a variety of new energy combine the large-capacity distributing electric power system powered.
Description
Technical field
Built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter according to the present invention, belongs to
Technics of Power Electronic Conversion technology.
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.Therefore, based on dc generator, accumulator, photovoltaic cell and fuel cell etc.
The secondary transformation of electrical energy occasion of DC power supply, inverter have 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
Low frequency isolation, multiple input power supply one between Parallel Time-sharing selecting switch, output and input built in single output high-frequency inverter circuit
Time sharing power supply, circuit topology are succinct in a switch periods, share output low frequency transformer filter circuit, single-stage power conversion, change
Change the built-in Parallel Time-sharing selecting switch electricity for the features such as efficient, output voltage ripple is small, output capacity is big, application prospect is extensive
Die mould single-stage multi input low frequency link inverter.
Technical program of the present invention lies in：A kind of built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link
Inverter is by multiple input filters and a shared output altogether by a multiple input single output high-frequency inverter circuit
The connection of low frequency isolation voltage transformation filter circuit is formed, and each input terminal of multiple input single output high-frequency inverter circuit is filtered with each input
The output terminal of ripple device corresponds connection, and the output terminal of multiple input single output high-frequency inverter circuit isolates change with the output low frequency
The low-frequency transformer input terminal or output inductor of press filtration wave circuit are filtered with the non-input terminal being connected of low-frequency transformer or output
The input terminal of ripple device is connected, and the multiple input single output high-frequency inverter circuit selects four-quadrant by multiple built-in Parallel Time-sharings
The bidirectional power flow single-input single-output high-frequency inverter circuit of power switch is formed, and is equivalent to a bidirectional power at any time
Single-input single-output high-frequency inverter circuit is flowed, the output low frequency is isolated voltage transformation filter circuit and filtered by low-frequency transformer, output
Ripple device is sequentially cascaded by output inductor, low-frequency transformer, output filter capacitor or by output filter, low-frequency transformer
It forms.
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 knot of new built-in Parallel Time-sharing selecting switch
Structure, it is proposed that built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter circuit structure and topological race and
Its energy management control strategy, the i.e. circuit structure are to select four-quadrant power switch by providing a kind of built-in Parallel Time-sharing
Multiple input filters and a shared output low frequency isolation altogether is become press filtration by multiple input single output high-frequency inverter circuit
Wave circuit couples.
The built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter of the present invention, can will be multiple
Altogether, unstable input direct voltage, which is reverse into needed for a load, stablizes good output alternating current, has multi input
DC power supply is not isolated from, exports and input low frequency isolation, multi input power supply altogether, between multiple input single output high-frequency inverter circuit
Time sharing power supply, circuit topology are succinct in one switch periods, share output low frequency transformer filter circuit, single-stage power conversion,
The features such as conversion efficiency is high, output voltage ripple is small, output capacity is big, application prospect is extensive.Built-in Parallel Time-sharing selecting switch
The comprehensive performance of voltage-type single-stage multi input low frequency link inverter, will be than traditional DC converter and inverter two-stage cascade
The multi input inverter formed is 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, built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter principle block diagram.
Fig. 5, built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter circuit structure chart.
Fig. 6, Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter built in bipolar SPWM control
Steady principle oscillogram.
Fig. 7, Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter built in Unipolar SPWM control
Steady principle oscillogram.
Fig. 8, built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter circuit topology example
One ----push-pull circuit schematic diagram.
Fig. 9, built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter circuit topology example
Two ----push-pull ortho-exciting formula circuit diagram.
Figure 10, built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter circuit topology example
Three ----half bridge circuit schematic diagram I.
Figure 11, built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter circuit topology example
Four ----half bridge circuit schematic diagram II.
Figure 12, built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter circuit topology example
Five ----half bridge circuit schematic diagram III.
Figure 13, built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter circuit topology example
Six ----full bridge circuit schematic diagram I.
Figure 14, built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter circuit topology example
Seven ----full bridge circuit schematic diagram II.
Figure 15, built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter circuit topology example
Eight ----full bridge circuit schematic diagram III.
Figure 16, it is the output voltage of built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter, defeated
Enter instantaneous current feedback bipolar SPWM principal and subordinate power distribution energy management control block diagram.
Figure 17, it is the output voltage of built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter, defeated
Enter instantaneous current feedback bipolar SPWM principal and subordinate power distribution energy management control principle oscillogram.
Figure 18, it is the output voltage of built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter, defeated
Enter instantaneous current feedback Unipolar SPWM principal and subordinate power distribution energy management control block diagram.
Figure 19, it is the output voltage of built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter, defeated
Enter instantaneous current feedback Unipolar SPWM principal and subordinate power distribution energy management control principle oscillogram.
Figure 20 has output terminal and connects the built-in Parallel Time-sharing selecting switch voltage of single-stage isolated Bidirectional charging-discharging converter
Type single-stage multi input low frequency link autonomous power supply system.
Figure 21 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 22, the output voltage u of autonomous power supply systemoWith output inductor electric current iLf、iLf' waveform.
Specific embodiment
Technical scheme is described further with reference to Figure of description and embodiment.
Built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter, is defeated by a multi input list
Go out high-frequency inverter circuit by multiple input filters and a shared output low frequency isolation voltage transformation filter circuit connection altogether
It forms, each input terminal of multiple input single output high-frequency inverter circuit is corresponded with the output terminal of each input filter to be joined
It connects, the output terminal of multiple input single output high-frequency inverter circuit isolates the low-frequency transformer of voltage transformation filter circuit with the output low frequency
Input terminal or the input terminal of the output inductor input terminal being connected non-with low-frequency transformer or output filter are connected, described
Multiple input single output high-frequency inverter circuit by multiple built-in Parallel Time-sharings selection four-quadrant power switch bidirectional power flow list
The single output high-frequency inverter circuit of input is formed, and is equivalent to a bidirectional power flow single-input single-output high-frequency inversion at any time
Circuit, the output low frequency isolate voltage transformation filter circuit by low-frequency transformer, output filter or by output inductor, low
Frequency power transformer, output filter capacitor are sequentially cascaded and formed by output filter, low-frequency transformer.
Functional block diagram, the circuit knot of built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter
The steady principle waveform of structure, bipolar SPWM control and Unipolar SPWM control inverter, respectively as shown in FIG. 4,5,6, 7.Figure
4th, in 5,6,7, Ui1、Ui2、…、UinFor n roads input dc power potential source (n is the natural number more than 1), ZLIt is exchanged for single-phase output
Load (loads) including single phase ac passive load and single phase ac power grid, uo、ioRespectively single-phase output alternating voltage with exchange
Electric current.The single output high-frequency inverter circuit of n inputs is by the bidirectional power of multiple built-in Parallel Time-sharing selection four-quadrant power switch
Single-input single-output high-frequency inverter circuit is flowed to form；The single output high-frequency inverter circuit of n inputs is to bear bi-directional voltage by multiple
Stress, the four-quadrant high frequency power switch of bidirectional current stress and one or more can bear unidirectional voltage stress, two-way electricity
Two quadrant high frequency powers switch of stream stress is realized or only can bear bi-directional voltage stress, bidirectional current stress by multiple
Four-quadrant high frequency power switch is realized, MOSFET, IGBT, GTR constant power device can be selected；(" 1 " is held and " 1 ' " end is in dashed box
Union end) output low frequency isolation voltage transformation filter circuit sequentially cascaded and form or by exporting by low-frequency transformer, output filter
Filter inductance, low-frequency transformer, output filter capacitor sequentially cascade composition, and (low-frequency transformer primary side leakage inductance can be output filtered electrical
Sense absorbs or is used to serve as output inductor completely) or by output inductor, output filter capacitor, low frequency change
Depressor sequentially cascades composition, is only depicted in figure as space is limited suitable for the LC output filters of passive AC load or output filter
The circuit diagram of ripple capacitance, and be not drawn into being suitable for adding after the LCL output filters or output filter capacitor of AC network load
Add the circuit diagram of output inductor；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 input direct-current during LC wave filters
Electric current can be smoother.The single high-frequency inverter circuit that exports of n inputs is by n roads input dc power potential source Ui1、Ui2、…、UinIt is modulated into amplitude
With the bipolarity binary states of input direct voltage variation or the multilevel SPWM voltage wave of unipolarity tri-state, through low-frequency transformer T, defeated
Go out wave filter Lf-CfOr through output inductor Lf, low-frequency transformer T, output filter capacitor CfOr through output inductor Lf, it is defeated
Go out filter capacitor Cf, obtain the sine of high quality after low-frequency transformer T on the net in single phase ac passive load or single-phase alternating current
Alternating voltage uoOr simple sinusoidal alternating current io, n input pulse electric current of the single output high-frequency inverter circuit of n inputs is through input filter
Device Li1-Ci1、 Li2-Ci2、…、Lin-CinOr Ci1、Ci2、…、CinAfterwards in n roads input DC power Ui1、Ui2、…、UinMiddle acquisition
Smooth input direct-current electric current Ii1、Ii2、…、Iin.It should be added that when output low frequency isolate voltage transformation filter circuit by
When low-frequency transformer, output filter sequentially cascade composition, bipolarity binary states and unipolarity tri-state multilevel SPWM voltage wave uAB
+ 1 state amplitude be Ui1N2/N1、Ui2N2/N1、…、UinN2/N1, and -1 state amplitude is UinN2/N1It (is designed as here only by
N roads input source UinFeedback exchange side energy is also designed to through the other any feedback exchange side of input source all the way energy)；When
Output low frequency isolates voltage transformation filter circuit by output inductor, low-frequency transformer, output filter capacitor or by output filtered electrical
When sense, output filter capacitor, low-frequency transformer sequentially cascade composition, bipolarity binary states and unipolarity tri-state multilevel SPWM voltage
Ripple uAB+ 1 state amplitude be Ui1、Ui2、…、Uin, and -1 state amplitude is UinIt (is designed as here only through the n-th road input source UinIt returns
Exchange side energy is presented, is also designed to through the other any feedback exchange side of input source all the way energy).
Built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter belongs to voltage-dropping type inverter, n
A input source is to load Parallel Time-sharing power supply.If the output signal I of n-1 input source error amplifier1e、I2e、…、I(n-1)eWith
The output signal u of output voltage error amplifiereAmplitude be I1em、I2em、I(n-1)em、Uem, saw-toothed carrier signal ucAmplitude
For Ucm, then corresponding modulation degree 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 folded of output end voltage
Add, i.e. output voltage uoWith input direct voltage (Ui1、Ui2、…、Uin), low-frequency transformer turn ratio N2/N1, modulation degree (m1、
m2、…、mn) between relation be uo=[(m1Ui1+(m2-m1)Ui2+…+(mn-mn-1)Uin)]N2/N1(Unipolar SPWM control)
Or uo=[(2m1-1)Ui1+(2m2-2m1-1)Ui2+…+(2mn-2mn-1-1)Uin)]N2/N1(bipolar SPWM control).For
Appropriate modulation degree m1、m2、…、mnWith low-frequency transformer turn ratio N2/N1, uoCan greater than, equal to or less than input direct voltage it
And Ui1+Ui2+…+Uin, the low-frequency transformer in the inverter not only plays the security reliability and electricity for improving invertor operation
Magnetic compatibility, it is often more important that play the role of matched output voltage and input voltage, that is, realize the output electricity of inverter
Pressure is higher than, equal to or less than the sum of input direct voltage Ui1+Ui2+…+UinTechnique effect, application range obtained significantly
It widens.Since there are 0 ＜ m1+(m2-m1)+…+(mn-mn-1) ＜ 1 (Unipolar SPWM control) and 0.5 ＜ m1+(m2-m1)+…+
(mn-mn-1) ＜ 1 (bipolar SPWM control), so uo＜ (Ui1+Ui2+…+Uin)N2/N1, i.e. output voltage uoAlways less than defeated
Enter DC voltage (Ui1、Ui2、…、Uin) and low-frequency transformer turn ratio N2/N1The sum of products (Ui1+Ui2+…+Uin)N2/N1；Due to
The inverter belongs to single stage circuit structure, and transformer working frequency is equal to output voltage frequency, multi-channel parallel timesharing selection
Four-quadrant power switch is located within high-frequency inverter circuit, therefore this kind of inverter is known as built-in Parallel Time-sharing selecting switch voltage
Type (voltage-dropping type) single-stage multi input low frequency link inverter.N input source of the inverter within a HF switch cycle only
To output AC load power supply, modulation degree can identical (m for energy timesharing1=m2=...=mn), it can not also be with (m1≠m2≠…≠
mn)。
Built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter of the present invention, due to altogether
With a multiple input single output high-frequency inverter circuit and output low frequency isolation voltage transformation filter circuit, with DC converter and inverse
There is differences substantially for the circuit structure for traditional multi input inverter that change device two-stage cascade is formed.Therefore, institute of the present invention
Inverter is stated with novelty and creativeness, and with output and input low frequency isolation, multi input power supply time sharing power supply, circuit
Topological succinct, single-stage power conversion, conversion efficiency high (meaning that energy loss is small), input voltage prepare flexible, output voltage
The advantages that ripple is small, output capacity is big, at low cost, application prospect is extensive is a kind of preferably energy-saving type single-stage multi input
Inverter builds energy-saving, conservation-minded society today, with more important value vigorously advocating.
Built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter circuit topology race embodiment, such as
Shown in Fig. 8,9,10,11,12,13,14,15.Push-pull circuit shown in Fig. 8 is to bear bi-directional voltage stress, two-way by 2n
The four-quadrant high frequency power of current stress switchs to realize, half-bridge shown in the circuit of push-pull ortho-exciting formula shown in Fig. 9 and Figure 10,11,12
Formula circuit be bi-directional voltage stress can be born by 2n, the four-quadrant high frequency power switch of bidirectional current stress and 1 can hold
It is switched to realize by two quadrant high frequency powers of unidirectional voltage stress, bidirectional current stress, the electricity of full-bridge type shown in Figure 13,14,15
Road be bi-directional voltage stress can be born by 2n, the four-quadrant high frequency power switch of bidirectional current stress and 2 can bear it is unidirectional
Voltage stress, two quadrant high frequency powers of bidirectional current stress switch to realize.It should be added that Fig. 8,9,10,11,
12nd, circuit shown in 13,14,15 gives input filter as LC wave filters situation (half bridge circuit shown in Figure 10,11,12
Input filter capacitor is two bridge arm capacitance C1、C2), it does not provide as space is limited when input filter is capacitive filter situation
Circuit；Circuit shown in Fig. 9,10,11,12,13,14,15 need not all using four-quadrant high frequency power switch, eliminate 1 or
2 two quadrant high frequency powers switches；Half bridge circuit shown in the circuit of push-pull ortho-exciting formula shown in Fig. 9 and Figure 10,11,12 is only applicable to
The of substantially equal situation of n input supply voltage；The output low frequency isolation of half bridge circuit I, II, III shown in Figure 10,11,12 becomes
Press filtration wave circuit is respectively by low-frequency transformer and output filter, output inductor and low-frequency transformer and output filtered electrical
Hold, output filter and low-frequency transformer sequentially cascade composition；The output of full bridge circuit I, II, III shown in Figure 13,14,15 is low
Frequency isolation voltage transformation filter circuit is respectively by low-frequency transformer and output filter, output inductor and low-frequency transformer and output
Filter capacitor, output filter and low-frequency transformer sequentially cascade composition.Built-in Parallel Time-sharing selecting switch voltage-type single-stage is more
The power switching voltage stress of the topological embodiment of four kinds of low frequency link inverter is inputted, as shown in table 1.In table 1, Uimax=max
(Ui1, Ui2..., Uin).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 fitted
For 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 is suitable for multiple input direct voltages altogether, unstable being transformed into a required voltage swing, stablizes good output
Alternating current can be used to realize a variety of new energy distributed power supply systems of sigle-stage AC with excellent performance and wide application prospect
System, such as photovoltaic cell 40-60VDC/220V50HzAC or 115V400HzAC, 10kw Proton Exchange Membrane Fuel Cells 85-
120V/220V50HzAC or 115V400HzAC, 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 topological embodiment work(of four kinds of Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter built in table 1
Rate switching 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.Built-in Parallel Time-sharing selecting switch voltage-type single-stage
The energy management control strategy of multi input low frequency link inverter, need to be provided simultaneously with the energy management of input source, photovoltaic cell and
MPPT, output voltage (electric current) the control three zones of the new energy equipments such as wind-driven generator, also need to consider electric power storage sometimes
Smooth and seamless switching of the charge and discharge control and system in pond under different powering modes.Built-in Parallel Time-sharing selecting switch voltage-type
Single-stage multi input low frequency link inverter uses two kinds of different energy management modes：(1) energy management modes I-- principals and subordinates power
The method of salary distribution, 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,
2nd ..., the input current of n-1 roads input source, be equivalent to the given 1st, 2 ..., the input power of n-1 roads input source, needed for load
Deficit power by from the n-th road of power supply unit input source provide, can be not required to addition batteries to store energy equipment；(2) energy management
Mode II-maximum power output mode, the 1st, 2 ..., n roads input source with maximum power output to load, eliminate electric power storage
Pond energy storage device realizes the requirement that grid-connected system makes full use of the energy, if in output terminal and connecing an accumulator and filling
Discharger 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, 2 ..., the input current of n roads input source, be equivalent to control the 1st, 2 ..., the input work of n roads input source
Rate.
Built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter, using output voltage, input
Instantaneous current feedback bipolar SPWM, Unipolar SPWM principal and subordinate power distribution energy management control strategy, to form independent supply
Electric system；Or using input current instantaneous values feedback bipolar SPWM, Unipolar SPWM maximum power output energy management control
Strategy, to form grid-connected system.1st, 2 ..., n-1 roads input source output power is fixed and the supplement load of the n-th road input source
The output voltage of required deficit power, input current instantaneous values feedback bipolar SPWM, the distribution of Unipolar SPWM principal and subordinate power
Energy management control block diagram and control principle waveform, respectively as shown in Figure 16,17,18,19.Inverter the 1st, 2 ..., n-1 roads
Input current feedback signal Ii1f、Ii2f、…、Ii(n-1)fRespectively with the 1st, 2 ..., n-1 roads input source calculates through maximum power point
The reference current signal I obtained afterwardsi1r、Ii2r、…、Ii(n-1)rCompare amplification through proportional and integral controller, the error letter being exaggerated
Number I1e、I2e、…、I(n-1)eBe multiplied respectively with sinusoidal synchronizing signal again through absolute value circuit 1,2 ..., after n-1 ︱ i1e︳, ︳
i2e︱ ..., ︳ i(n-1)e︱, inverter output voltage feedback signal uofWith reference sinusoidal voltage urIt is relatively put through proportional and integral controller
Greatly, the error signal u of amplificatione︱ u are obtained after absolute value circuit ne︳, ︱ i1e︳, ︳ i2e︱ ..., ︳ i(n-1)e︱, ︱ ue︳ respectively with saw
Tooth form carrier wave ucIt hands over and cuts and consider that output voltage gating signal obtains the control of power switch after appropriate combinational logic circuit
Signal ugs11、ugs21、…、ugsn1、ugs12、ugs22、…、ugsn2、ugs′11、ugs′21、…、ugs′n1、ugs′12、ugs′22、…、 ugs′n2、
ugs3、ugs4.1st, 2 ..., n-1 roads current regulator independently work with the n-th road voltage regulator, the 1st, 2 ..., n-1 roads
Current regulator is used to implement the 1st, 2 ..., the maximum power output of n-1 roads input source, the n-th road voltage regulator is used to implement
The stabilization of inverter output voltage, n roads input source, which is combined, to power to the load.When input voltage or load variation, pass through adjusting
Reference voltage urWith reference current ii1r、ii2r、…、ii(n-1)r, or adjust feedback voltage uofWith feedback current ii1f、ii2f、…、
ii(n-1)fTo change error voltage signal ︱ ue︳ and error current signal ︱ i1e︳, ︳ i2e︱ ..., ︳ i(n-1)e︱, so as to change modulation
Spend m1、m2、…、mn, therefore can realize the inverter output voltage, the adjusting of input current (output power) and stabilization.
Carry out control input electric current when the n-th roads of Figure 16-19 Zhong input source is designed as input current feedback, then constitute defeated
Enter instantaneous current feedback bipolar SPWM, Unipolar SPWM maximum power output energy management control strategy.Inverter the 1st,
2nd ..., the input current feedback signal I on n roadsi1f、Ii2f、…、IinfRespectively with the 1st, 2 ..., n roads input source is through maximum power point
The reference current signal I obtained after calculatingi1r、Ii2r、…、IinrCompare amplification, error amplification signal through proportional and integral controller
I1e、I2e、…、IneBe multiplied respectively with sinusoidal synchronizing signal through absolute value circuit 1,2 ..., after n ︱ i1e︳, ︳ i2e︱ ..., ︳
ine︱, ︱ i1e︳, ︳ i2e︱ ..., ︳ ine︱ respectively with saw-toothed carrier ucIt hands over and cuts and consider output voltage gating signal through appropriate group
The control signal u of power switch is obtained after combinational logic circuitgs11、ugs21、…、ugsn1、ugs12、ugs22、…、ugsn2、ugs′11、
ugs′21、…、ugs′n1、ugs′12、ugs′22、…、 ugs′n2、ugs3、ugs4.1st, 2 ..., n roads current regulator independently work,
It is used to realize the maximum power output of respective input source, n roads input source, which is combined, to power to the load.
Figure 17, bipolarity shown in 19, Unipolar SPWM control principle waveform have marked HF switch cycle TSWith a certain height
Frequency switch periods TSInterior 1st, 2 ..., the ON time T of n roads input sourceon1、Ton2、…、TonnAnd total ON time Ton=
Ton1+Ton2+…+Tonn, total ON time TonWithin an output voltage cycle changed by sinusoidal rule.In addition, for
Half bridge circuit I, II, III shown in Figure 10,11,12, should be by half of input direct 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 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 20.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') composition is sequentially cascaded,
The frequency converter is switched by the four-quadrant high frequency power that can bear bi-directional voltage stress and bidirectional current stress and formed.Institute
The single-stage isolated Bidirectional charging-discharging converter stated is in the positive transmission (energy storage device electric discharge) of energy, (energy storage device fills back transfer
Electricity) 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 21.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 22.For output filter capacitor Cf、Cf' and load ZLFor, built-in Parallel Time-sharing selecting switch voltage-type single-stage is more
The output terminal and connecing of input low frequency link inverter and single-stage isolated Bidirectional charging-discharging converter be equivalent to two current sources and
Connection superposition.The energy management control strategy shown in Figure 21, built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input are low
The output inductor electric current i of frequency annulus inverterLfWith output voltage uoWith the same phase of frequency, active power of output；Charge/discharge transformation
Device is by output voltage uoWith reference voltage uorefError amplification signal uoeWith high frequency carrier hand over cut generation SPWM signals into
Row control, output inductor electric current iLf' and uoBetween there are phase difference θ, different phase difference θs means that output is different big
Small and direction active power.Work as Po=P1max+P2max+…+PnmaxWhen, θ=90 °, the wattful power of charge/discharge transformation device output
Rate is zero, in light condition；Work as Po>P1max+P2max+…+PnmaxWhen, uoReduce, 90 ° of θ ＜, the output of charge/discharge transformation device has
Work(power, energy storage device provide the deficit power needed for load to load discharge, i.e. energy storage device；Work as Po＜ P1max+P2max+…+
PnmaxWhen, 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
The dump power of input source output charges to energy storage device, is loaded when θ=180 ° maximum to the energy of energy storage device feedback.Cause
This, which can be according to PoWith P1max+P2max+…+PnmaxRelative size control single-stage isolated two-way in real time
The power flow size and Orientation of charge/discharge transformation device realizes smooth and seamless switching of the system under three kinds of different powering modes.
Claims (3)
1. a kind of built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter, it is characterised in that：It is this
Inverter is by multiple input filters and a shared output altogether by a multiple input single output high-frequency inverter circuit
The connection of low frequency isolation voltage transformation filter circuit is formed, and each input terminal of multiple input single output high-frequency inverter circuit is filtered with each input
The output terminal of ripple device corresponds connection, and the output terminal of multiple input single output high-frequency inverter circuit isolates change with the output low frequency
The low-frequency transformer input terminal or output inductor of press filtration wave circuit are filtered with the non-input terminal being connected of low-frequency transformer or output
The input terminal of ripple device is connected, and the multiple input single output high-frequency inverter circuit selects four-quadrant by multiple built-in Parallel Time-sharings
The bidirectional power flow single-input single-output high-frequency inverter circuit of power switch is formed, and is equivalent to a bidirectional power at any time
Single-input single-output high-frequency inverter circuit is flowed, the output low frequency is isolated voltage transformation filter circuit and filtered by low-frequency transformer, output
Ripple device is sequentially cascaded by output inductor, low-frequency transformer, output filter capacitor or by output filter, low-frequency transformer
It forms.
2. built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter according to claim 1,
It is characterized in that：The circuit topology of Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter is built in described
Push-pull type, push-pull ortho-exciting formula, semibridge system, full bridge circuit.
3. built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter according to claim 1,
It is characterized in that：The output terminal of the built-in Parallel Time-sharing selecting switch voltage-type single-stage multi input low frequency link inverter simultaneously connects
The single-stage isolated Bidirectional charging-discharging converter of one energy storage device, to form the autonomous power supply system of an output voltage stabilization；
The single-stage isolated Bidirectional charging-discharging converter by input filter, high-frequency inverter, high frequency transformer, frequency converter,
Output filter sequentially cascades composition, and the frequency converter is by that can bear the four of bi-directional voltage stress and bidirectional current stress
Quadrant high frequency power switch is formed；Multiple input source is operated in maximum power output mode, according to bearing power with it is multiple defeated
The relative size for entering the sum of source maximum power controls the power flow size and Orientation of single-stage isolated Bidirectional charging-discharging converter in real time,
Realize that system output voltage is stablized and the smooth and seamless of energy storage device charge and discharge switches.
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