CN106026749B - Topology variable micro- inverter and its numerical control device - Google Patents
Topology variable micro- inverter and its numerical control device Download PDFInfo
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- CN106026749B CN106026749B CN201610543076.8A CN201610543076A CN106026749B CN 106026749 B CN106026749 B CN 106026749B CN 201610543076 A CN201610543076 A CN 201610543076A CN 106026749 B CN106026749 B CN 106026749B
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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
- H02M7/53—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
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion 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
- H02M3/325—Conversion 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
- H02M3/335—Conversion 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
- H02M3/33569—Conversion 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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention discloses a kind of micro- inverter and its numerical control device that topology is variable, including two links of DC/AC and AC/AC, transformer secondary uses doublewound full-wave rectification structure, and in high power, micro- inverter works in bridge-type pattern, the forward and reverse two-way magnetization of transformer core；It is worked in when low-power and improves double tube positive exciting pattern, transformer core unidirectional magnetiztion.The design parameter of two kinds of lower transformers of work is consistent, by the variation of control strategy can be realized under high-power and small-power can efficient conversion, meet CEC efficiency and reach associated mechanisms requirement with European efficiency.
Description
Technical field
The present invention relates to a kind of micro- inverter and its numerical control device that topology is variable, belong to converters and
Its control technology field.
Background technology
Photo-voltaic power supply module can be divided into DC Module and AC module (i.e. micro- inverter) two classes.Although photovoltaic DC module
Middle DC/DC converters realize the MPPT of every piece of solar panel, and centralized DC/AC also ensures the efficient of system, but this also leads
Cause system redundancy not high.Photovoltaic micro-inverter directly can be integrated in panel backside with the interface arrangement of power grid, installation
It is convenient, it is hot-swappable, redundancy performance is good, therefore receive extensive research.
The common micro- inverter of isolated form can be divided into the micro- inverter of no DC link and with the micro- inverter of DC link, no direct current
Include DC/AC converters and AC/AC converters in the micro- inverter of link.Wherein AC/AC converters are frequency converter, and effect is
High-frequency ac is transformed to industrial frequency AC；And micro- inverter with DC link is divided into as smooth direct current link and pseudo- DC link
Two classes, compared to the band micro- inverter of DC link, the micro- inverter power transformation series of no DC link is few, conversion efficiency it is high and by
Pay attention to extensive, but other than the inverse-excitation type in addition to being often used at present is without the micro- inverter of DC link, few other kinds of nothings
The micro- inverter of DC link, and flyback declines that relatively low in relatively high power also further to constrain it wide for the efficiency of inverter
General use；Micro- inverter based on bridge circuit, it is less efficient when power is relatively low, it constrains it and weights efficiency value, make
It is difficult to the requirement for meeting relevant regulations.
Therefore a kind of micro- inverter structure that circuit topology is variable is established so that micro- inverter has not in underloading with full load
Same operating circuit, makes micro- inverter all obtain high efficiency under different capacity grade, and it is the present invention that can facilitate switching
Main task.
Invention content
Goal of the invention：To ensure that micro- inverter can realize efficient conversion under high-power and small-power, this paper presents
A kind of micro- inverter that topology is variable, micro- inverter works in bridge-type pattern when power is higher than 100W, and power is less than micro- when 100W
Inverter, which works in, improves double tube positive exciting pattern, and the design parameter of transformer is consistent in the case of two kinds, and variable micro- of topology
Inverter can realize higher weighting efficiency.
Technical solution：
A kind of micro- inverter that topology is variable, including input filter capacitor, full-bridge circuit, buffer inductance, high frequency transformer,
Cycle rectification circuit and grid-connected filter circuit；Wherein full-bridge circuit includes that band is anti-simultaneously using photovoltaic cell as input power
First switch pipe, second switch pipe, third switching tube, the 4th switching tube of union II pole pipe；The source electrode and third of first switch pipe
The drain electrode of switching tube connects, the drain electrode of first switch pipe, the drain electrode of second switch pipe, photovoltaic cell anode, input filter capacitor
Anode link together, the drain electrode of the source electrode of second switch pipe and the 4th switching tube connection, the source electrode of third switching tube, the 4th
The source electrode of switching tube, photovoltaic cell cathode, input filter capacitor negative terminal link together；
One end of the buffer inductance is connected between the source electrode of first switch pipe and the drain electrode of third switching tube；The high frequency becomes
Depressor includes primary side winding and two vice-side windings, and the wherein Same Name of Ends of primary side winding is connected with the other end of buffer inductance, former
The different name end of side winding is connected between the source electrode of second switch pipe and the drain electrode of the 4th switching tube；
The cycle rectification circuit includes the 5th switching tube, the 6th switching tube, the 7th switch with anti-paralleled diode
Pipe, the 8th switching tube, the Same Name of Ends of the first winding of secondary side connect with the drain electrode of the 5th switching tube, the source electrode of the 5th switching tube and the
The source electrode of six switching tubes connects, and the different name end of the second winding of secondary side is connect with the drain electrode of the 7th switching tube, the source of the 7th switching tube
Pole is connect with the source electrode of the 8th switching tube；
The grid-connected filter circuit includes grid-connected filter capacitor and grid-connected filter inductance, the drain electrode of the 6th switching tube, the 8th
The draining of switching tube, one end of the anode of grid-connected filter capacitor, grid-connected filter inductance links together, grid-connected filter inductance it is another
One end is connected with power grid firewire, the zero curve of power grid, secondary different name end in the first winding, it is secondary while the second winding Same Name of Ends, grid-connected
The negative terminal of filter capacitor links together；
A kind of numerical control device of the variable micro- inverter of topology, it is characterised in that：Including first voltage sensor,
Two voltage sensors, the first current sensor, the second current sensor and DSP digitial controllers, wherein DSP digitial controllers
Including MPPT maximum power point tracking module, phaselocked loop, multiplier, subtracter, PID regulator, the first polarity recognizer, the second polarity
Identifier, the first signal modulator, second signal modulator, first mode selecting switch, second mode selecting switch；
The input terminal of first voltage sensor is connected to the both ends of photovoltaic cell, and second voltage sensor is connected to power grid
Both ends, the first current sensor are connected between the drain electrode of first switch pipe and the anode of photovoltaic cell, the second current sensor
Input terminal and grid-connected filter inductance LgIt is in series；
The first input end of MPPT maximum power point tracking module and the second input terminal are separately connected above-mentioned first current sensor
Output end and first voltage sensor output end, the input terminal of phaselocked loop connects the output end of above-mentioned second voltage sensor,
The first input end of multiplier connects the second output terminal of MPPT maximum power point tracking module, the second input termination phaselocked loop of multiplier
Output end, the output end of the positive input termination multiplier of subtracter, the negative input of subtracter terminates the second current sensor
Output end, the output end of the input termination subtracter of PID regulator, the output end of PID regulator respectively with the first signal modulation
Device is connected with the input terminal of second signal modulator, and the first input end of first mode selecting switch connects MPPT maximum power point tracking mould
First output end of block, the output end of second input the first signal modulator of termination of first mode selecting switch, first mode
The output end of the third input termination second signal modulator of selecting switch, the first polarity recognizer and the second polarity recognizer
Input terminal is all connect with the output end of second voltage sensor, and the first input end of second mode selecting switch connects maximum power point
First output end of tracking module, the output end of second input the first polarity recognizer of termination of second mode selecting switch, the
The output end of third input the second polarity recognizer of termination of two modes selecting switch；
When MPPT maximum power point tracking module output power value is higher than 100W, circuit works in bridge-type pattern, first mode
Selecting switch exports the output signal of the first signal modulator, which controls the on off state of four switching tubes of full-bridge circuit,
Make four switching tubes all in high-frequency work state；Second mode selecting switch exports the output signal of the first polarity recognizer,
The signal controls the on off state of cycle four switching tubes of rectification circuit, when the input of the first polarity recognizer is high level, the
Five switching tubes and the 7th switching tube are in opening state, and the 6th switching tube and the 8th switching tube are off state, when the first pole
Property identifier input be low level when, the 5th switching tube and the 7th switching tube are off state, and the 6th switching tube and the 8th open
It closes pipe and is in opening state；
When MPPT maximum power point tracking module output power value is less than 100W, circuit, which works in, improves double tube positive exciting pattern,
First mode selecting switch exports the output signal of second signal modulator, and signal control four switching tubes of full-bridge circuit are opened
Off status makes first switch pipe and the 4th switching tube be in high-frequency work state, and second switch pipe and third switching tube is made to be in
Off state；Second mode selecting switch exports the output signal of the second polarity recognizer, which controls cycle rectification circuit
The on off state of four switching tubes, when the input of the second polarity recognizer is high level, the 5th switching tube is in opening state, the
Six switching tubes, the 7th switching tube and the 8th switching tube are off state, when the input of the second polarity recognizer is low level, the
Eight switching tubes are in opening state, and the 5th switching tube, the 6th switching tube, the 7th switching tube are off state；
A kind of digital control method of the variable micro- inverter of topology, it is characterised in that：In bridge-type operating mode, transformation
The output of device front stage circuits is the high-frequency alternating current of pulse width variability, and four switching tubes of full-bridge circuit are in high-frequency work state；
When improving double tube positive exciting operating mode, full-bridge circuit is only in high-frequency work state there are two switching tube, saves two and opens
The drive loss of pipe is closed, only there are one switching tubes to be in open-minded in power frequency half period for the cycle rectification circuit of transformer secondary
State saves the switching loss and drive loss of switching tube, is conducive to the promotion of efficiency in the case of small-power.
Advantageous effect：After adopting the above scheme, due to before transformer series inductance electric current be crucial controlled quentity controlled variable, and circuit is defeated
It is in current source characteristic to go out, and all switches can all realize Sofe Switch in the converter, and eliminate transformer secondary rectifier diode
Reverse recovery loss, circuit can all realize high-efficiency transfer in both modes；Micro- inverter can also be obtained by analysis
Maximum duty cycle, the preset value of duty ratio, the current stress of switching tube and passive option parameter.
Description of the drawings
Fig. 1 is the variable micro- inverter and its numerical control device block diagram of the topology of the embodiment of the present invention；
Fig. 2 is the embodiment of the present invention in bridge-type operating mode circuit figure；
Fig. 3 be the embodiment of the present invention in bridge-type operating mode, the main waveform diagram of circuit in a power frequency period；
Fig. 4 is that the embodiment of the present invention is improving double tube positive exciting operating mode circuit figure；
Fig. 5 be the embodiment of the present invention when improving double tube positive exciting operating mode, the primary waves of circuit in a power frequency period
Shape schematic diagram；
Designation in figure：UPV--- photovoltaic cell output voltage；IPV--- photovoltaic cell output current；Cin--- it is defeated
Enter filter capacitor；uAB--- buffer inductance input terminal voltage；S1~S8 --- eight switching tubes of first switch Guan Zhi；L --- it is slow
Rush inductance；ir--- buffer inductance electric current；T --- high frequency transformer；The turn ratio of n --- transformer secondary and primary side；uw1——
High frequency transformer original edge voltage；irec--- transformer secondary side current；Cg--- grid-connected filter capacitor；Lg--- grid-connected filtered electrical
Sense；iC--- grid-connected filter capacitor electric current；ig--- grid-connected current；ug--- network voltage；UPV_f--- first voltage sensor
Output signal；IPV_f--- the first current sensor output；ug_f--- second voltage sensor output signal；ig_f——
Second current sensor output；P --- the first output end signal of MPPT maximum power point tracking module；I* --- maximum power point
Tracking module second output terminal signal；I* --- pll output signal；ig* --- multiplier output signal；ig_e--- subtraction
Device output signal；D --- PID regulator output signal；uS1a~uS4a--- the first signal modulator output signal；uS1b~
uS4b--- second signal modulator output signal；uS5a~uS8a--- the first polarity recognizer output signal；uS5b~uS8b——
Second polarity recognizer output signal；uS1~uS8--- the drive signal of eight switching tubes of first switch Guan Zhi.
Specific implementation mode
With reference to specific embodiment, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate the present invention
Rather than limit the scope of the invention, after having read the present invention, various equivalences of the those skilled in the art to the present invention
The modification of form falls within the application range as defined in the appended claims.
As shown in Figure 1, a kind of micro- inverter that topology is variable, including input filter capacitor Cin, full-bridge circuit, buffer inductance
L, high frequency transformer T, cycle rectification circuit and grid-connected filter circuit, put up with below its interconnected relationship and building block into
Row is described in detail.
Full-bridge circuit includes the first switch pipe S1 with anti-paralleled diode, using photovoltaic cell as input power
Two switching tube S2, third switching tube S3, the 4th switching tube S4；The source electrode of S1 is connected with the drain electrode of S3, the drain electrode of S1, the leakage of S2
Pole, photovoltaic cell anode, input filter capacitor CinAnode link together, the source electrode of S2 is connected with the drain electrode of S4, the source of S3
Pole, the source electrode of S4, photovoltaic cell cathode, input filter capacitor CinNegative terminal link together；Mono- ends buffer inductance L are connected on S1's
Between source electrode and the drain electrode of S3；High frequency transformer T includes primary side winding and two vice-side windings, the wherein Same Name of Ends of primary side winding
It is connected with the other end of buffer inductance L, the different name end of primary side winding is connected to the source electrode and the 4th switching tube S2 of second switch pipe
Between the drain electrode of S4；Cycle rectification circuit includes with the 5th switching tube S5 of anti-paralleled diode, the 6th switching tube S6, the
The drain electrode of seven switching tube S7, the 8th switching tube S8, the Same Name of Ends and S5 of the first winding of secondary side connect, the source electrode of S5 and the source electrode of S6
Connection, the different name end of the second winding of secondary side and the drain electrode of S7 connect, and the source electrode of S7 and the source electrode of S8 connect；Grid-connected filter circuit packet
Include grid-connected filter capacitor CgWith grid-connected filter inductance Lg, the drain electrode of S6, the draining of S8, grid-connected filter capacitor CgAnode, grid-connected filter
Wave inductance LgOne end link together, grid-connected filter inductance LgThe other end connected with power grid firewire, the zero curve of power grid, secondary side
The different name end of first winding, Same Name of Ends, the grid-connected filter capacitor C of the second winding of pair sidegNegative terminal link together.
The numerical control device of the micro- inverter variable applied to topology, it is characterised in that：Including first voltage sensor,
Second voltage sensor, the first current sensor, the second current sensor and DSP digitial controllers, wherein DSP are digital control
Device includes MPPT maximum power point tracking module, phaselocked loop, multiplier, subtracter, PID regulator, the first polarity recognizer, the second pole
Property identifier, the first signal modulator, second signal modulator, first mode selecting switch, second mode selecting switch；
The input terminal of first voltage sensor is connected to the both ends of photovoltaic cell, and second voltage sensor is connected to power grid
Both ends, the first current sensor are connected between the drain electrode of first switch pipe and the anode of photovoltaic cell, the second current sensor
Input terminal and grid-connected filter inductance LgIt is in series；
The first input end of MPPT maximum power point tracking module and the second input terminal are separately connected above-mentioned first current sensor
Output end and first voltage sensor output end, the input terminal of phaselocked loop connects the output end of above-mentioned second voltage sensor,
The first input end of multiplier connects the second output terminal of MPPT maximum power point tracking module, the second input termination phaselocked loop of multiplier
Output end, the output end of the positive input termination multiplier of subtracter, the negative input of subtracter terminates the second current sensor
Output end, the output end of the input termination subtracter of PID regulator, the output end of PID regulator respectively with the first signal modulation
Device is connected with the input terminal of second signal modulator, and the first input end of first mode selecting switch connects MPPT maximum power point tracking mould
First output end of block, the output end of second input the first signal modulator of termination of first mode selecting switch, first mode
The output end of the third input termination second signal modulator of selecting switch, the first polarity recognizer and the second polarity recognizer
Input terminal is all connect with the output end of second voltage sensor, and the first input end of second mode selecting switch connects maximum power point
First output end of tracking module, the output end of second input the first polarity recognizer of termination of second mode selecting switch, the
The output end of third input the second polarity recognizer of termination of two modes selecting switch；When MPPT maximum power point tracking module output work
When rate value is higher than 100W, circuit works in bridge-type pattern, and first mode selecting switch exports the output letter of the first signal modulator
Number, which controls the on off state of four switching tubes of full-bridge circuit, makes four switching tubes all in high-frequency work state；Second
Mode selection switch exports the output signal of the first polarity recognizer, and signal control cycle four switching tubes of rectification circuit are opened
Off status, when the input of the first polarity recognizer is high level, the 5th switching tube and the 7th switching tube are in opening state, and the 6th
Switching tube and the 8th switching tube are off state, when the input of the first polarity recognizer is low level, the 5th switching tube and the
Seven switching tubes are off state, and the 6th switching tube and the 8th switching tube are in opening state；When MPPT maximum power point tracking module
When output power value is less than 100W, circuit works in double tube positive exciting pattern of improving, and first mode selecting switch exports second signal
The output signal of modulator, the signal control the on off state of four switching tubes of full-bridge circuit, first switch pipe and the 4th are made to open
It closes pipe and is in high-frequency work state, second switch pipe and third switching tube is made to be off state；Second mode selecting switch is defeated
Go out the output signal of the second polarity recognizer, which controls the on off state of cycle four switching tubes of rectification circuit, when second
When polarity recognizer input is high level, the 5th switching tube is in opening state, and the 6th switching tube, the 7th switching tube and the 8th are opened
It closes pipe and is off state, when the input of the second polarity recognizer is low level, the 8th switching tube is in opening state, and the 5th opens
Guan Guan, the 6th switching tube, the 7th switching tube are off state.
Fig. 2 is equivalent circuit diagram of the present invention in bridge-type operating mode, switching tube drive signal in a power frequency period
And mains voltage, current waveform figure such as Fig. 3, it is described in detail to obtain the grid-connected current i of standard in figureg, buffer inductance is defeated
Enter terminal voltage uAB, buffer inductance electric current ir, four switching tube drive signals of cycle rectification circuit change with time situation；Fig. 4
For equivalent circuit diagram of the present invention when improving double tube positive exciting pattern, switching tube drive signal and main in a power frequency period
Voltage, current waveform figure such as Fig. 5 are described in detail to obtain the grid-connected current i of standard in figureg, two switching tubes of bridge circuit
Drive signal, buffer inductance electric current ir, two switching tube drive signals of cycle rectification circuit change with time situation.
In conclusion the digital control method of the micro- inverter variable applied to topology, all switching devices all work
In Sofe Switch state；Transformer voltage ratio has the current stress of different switching tubes different influences, determines therefrom that moderate transformation
Device no-load voltage ratio；When input power is less than 100W, circuit works in double tube positive exciting pattern of improving, and only there are two at switching tube for full-bridge circuit
In high-frequency work state, the drive loss of two switching tubes is saved, the cycle rectification circuit of transformer secondary is in half of power frequency
It only is in opening state there are one switching tube in period, saves the switching loss and drive loss of switching tube；Input power is high
When 100W, circuit works in bridge-type pattern, and conduction loss is low, iron loss is smaller, relative to other existing micro- inverters, herein
The variable micro- inverter of used topology small-power and it is high-power when have smaller loss, make it have higher weighting
Efficiency can realize the efficient conversion of the electric energy in a power frequency period.
Claims (1)
1. a kind of micro- inverter that topology is variable, it is characterised in that：Including input filter capacitor, full-bridge circuit, buffer inductance, height
Frequency power transformer, cycle rectification circuit and grid-connected filter circuit；Wherein full-bridge circuit is wrapped using photovoltaic cell as input power
Containing the first switch pipe with anti-paralleled diode, second switch pipe, third switching tube, the 4th switching tube；The source of first switch pipe
Pole is connected with the drain electrode of third switching tube, the drain electrode of first switch pipe, the drain electrode of second switch pipe, photovoltaic cell anode, input
Filter capacitor CinAnode link together, the drain electrode of the source electrode of second switch pipe and the 4th switching tube connection, third switching tube
Source electrode, the 4th switching tube source electrode, photovoltaic cell cathode, input filter capacitor CinNegative terminal link together；
One end of the buffer inductance is connected between the source electrode of first switch pipe and the drain electrode of third switching tube；The high frequency transformer
Including primary side winding and two vice-side windings, the wherein Same Name of Ends of primary side winding is connected with the other end of buffer inductance, primary side around
The different name end of group is connected between the source electrode of second switch pipe and the drain electrode of the 4th switching tube；
The cycle rectification circuit includes with the 5th switching tube of anti-paralleled diode, the 6th switching tube, the 7th switching tube, the
The Same Name of Ends of eight switching tubes, the first winding of secondary side is connect with the drain electrode of the 5th switching tube, and the source electrode of the 5th switching tube is opened with the 6th
Close the source electrode connection of pipe, the different name end of the second winding of secondary side connect with the drain electrode of the 7th switching tube, the source electrode of the 7th switching tube and
The source electrode of 8th switching tube connects；
The grid-connected filter circuit includes grid-connected filter capacitor CgWith grid-connected filter inductance Lg, the drain electrode of the 6th switching tube, the 8th open
Close the draining of pipe, grid-connected filter capacitor CgAnode, grid-connected filter inductance LgOne end link together, grid-connected filter inductance Lg
The other end connected with power grid firewire, the zero curve of power grid, secondary different name end in the first winding, it is secondary while the second winding Same Name of Ends,
Grid-connected filter capacitor CgNegative terminal link together；
Further include first voltage sensor, second voltage sensor, the first current sensor, the second current sensor and DSP
Digitial controller, wherein DSP digitial controllers include MPPT maximum power point tracking module, phaselocked loop, multiplier, subtracter, PID tune
Save device, the first polarity recognizer, the second polarity recognizer, the first signal modulator, second signal modulator, first mode selection
Switch, second mode selecting switch；
The input terminal of first voltage sensor is connected to the both ends of photovoltaic cell, and second voltage sensor is connected to the two of power grid
End, the first current sensor be connected on first switch pipe drain electrode the anode of photovoltaic cell between, the second current sensor it is defeated
Enter end and grid-connected filter inductance LgIt is in series；
The first input end of MPPT maximum power point tracking module and the second input terminal are separately connected the defeated of above-mentioned first current sensor
The output end of outlet and first voltage sensor, the input terminal of phaselocked loop connect the output end of above-mentioned second voltage sensor, multiplication
The first input end of device connects the second output terminal of MPPT maximum power point tracking module, and the second input of multiplier terminates the defeated of phaselocked loop
Outlet, the output end of the positive input termination multiplier of subtracter, the negative input of subtracter terminate the output of the second current sensor
End, the output end of the input termination subtracter of PID regulator, the output end of PID regulator respectively with the first signal modulator and
The input terminal of second signal modulator connects, and the first input end of first mode selecting switch connects MPPT maximum power point tracking module
First output end, the output end of second input the first signal modulator of termination of first mode selecting switch, first mode selection
The output end of the third input termination second signal modulator of switch, the input of the first polarity recognizer and the second polarity recognizer
End is all connect with the output end of second voltage sensor, and the first input end of second mode selecting switch connects MPPT maximum power point tracking
First output end of module, the output end of second input the first polarity recognizer of termination of second mode selecting switch, the second mould
The output end of third input the second polarity recognizer of termination of formula selecting switch；
When MPPT maximum power point tracking module output power value is higher than 100W, circuit works in bridge-type pattern, first mode selection
The output signal of switch the first signal modulator of output removes the on off state of control four switching tubes of full-bridge circuit, makes four switches
Pipe is all in high-frequency work state；The output signal that second mode selecting switch exports the first polarity recognizer goes control cycle whole
The on off state of four switching tubes of current circuit, when the input of the first polarity recognizer is high level, the 5th switching tube and the 7th is opened
It closes pipe and is in opening state, the 6th switching tube and the 8th switching tube are off state, when the input of the first polarity recognizer is low
When level, the 5th switching tube and the 7th switching tube are off state, and the 6th switching tube and the 8th switching tube are in opening state；
When MPPT maximum power point tracking module output power value be less than 100W when, circuit work in improve double tube positive exciting pattern, first
The output signal of mode selection switch output second signal modulator removes the on off state of control four switching tubes of full-bridge circuit, makes
First switch pipe and the 4th switching tube are in high-frequency work state, and second switch pipe and third switching tube is made to be off state；
The output signal that second mode selecting switch exports the second polarity recognizer goes opening for control cycle four switching tubes of rectification circuit
Off status, when the input of the second polarity recognizer is high level, the 5th switching tube is in opening state, the 6th switching tube, the 7th
Switching tube and the 8th switching tube are off state, and when the input of the second polarity recognizer is low level, the 8th switching tube is in
Opening state, the 5th switching tube, the 6th switching tube, the 7th switching tube are off state.
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| CN107244255B (en) * | 2017-06-26 | 2024-01-05 | 江苏师范大学 | H-bridge and high-frequency transformer-based electric automobile charging and driving integrated converter |
| CN107453630B (en) * | 2017-08-31 | 2019-10-01 | 青岛大学 | A kind of stage photovoltaic single off-network inverter and its control method with high-frequency rectification control |
| CN107517020A (en) * | 2017-08-31 | 2017-12-26 | 青岛大学 | A kind of grid-connected micro- inverter of stage photovoltaic single and its control method |
| CN107508484A (en) * | 2017-08-31 | 2017-12-22 | 青岛大学 | A kind of grid-connected micro- inverter of stage photovoltaic single and its control method with high-frequency rectification control |
| CN107359807B (en) * | 2017-08-31 | 2019-10-01 | 青岛大学 | A kind of single-stage photovoltaic inverter and its control method with transformer bidirectional excitation |
| CN107516994B (en) * | 2017-10-10 | 2019-10-25 | 厦门市爱维达电子有限公司 | A kind of self-powered inverter IGBT driving device based on Magnetic isolation |
| EP3912266A4 (en) * | 2019-01-18 | 2022-08-24 | Abb Schweiz Ag | Pv power converter |
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