CN106026749A - Topology variable micro inverter and digital control device thereof - Google Patents

Topology variable micro inverter and digital control device thereof Download PDF

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Publication number
CN106026749A
CN106026749A CN201610543076.8A CN201610543076A CN106026749A CN 106026749 A CN106026749 A CN 106026749A CN 201610543076 A CN201610543076 A CN 201610543076A CN 106026749 A CN106026749 A CN 106026749A
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China
Prior art keywords
switching tube
input
outfan
state
switching
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Granted
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CN201610543076.8A
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Chinese (zh)
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CN106026749B (en
Inventor
吴云亚
阚加荣
许志华
尚志根
冯赛非
薛迎成
姚志垒
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Jiangsu Guangxun Power New Energy Co.,Ltd.
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Yangcheng Institute of Technology
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/0048Circuits or arrangements for reducing losses
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/0048Circuits or arrangements for reducing losses
    • H02M1/0054Transistor switching losses
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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 invention discloses a topology variable micro inverter and a digital control device thereof. Two links of DC/AC and AC/AC are comprised. The secondary side of a transformer uses a double-winding full-wave rectifying structure. Under high power, the micro inverter works in a bridge mode, and a transformer core is in positive and negative two-way magnetization. Under low power, the micro inverter works in an improved dual-tube forward mode, and the transformer core is in unidirectional magnetization. The design parameters of the transformer are the same in two working modes. Through the change of control policies, efficient conversion can be realized under high and low power, and CEC efficiency and European efficiency meet the requirements of related organizations.

Description

The variable micro-inverter of topology and numerical control device thereof
Technical field
The present invention relates to the variable micro-inverter of a kind of topology and numerical control device thereof, belong to Technics of Power Electronic Conversion Device and control technical field thereof.
Background technology
Photo-voltaic power supply module can be divided into DC Module and AC module (the most micro-inverter) two classes.Although photovoltaic is straight In flow module, DC/DC changer achieves the MPPT of every piece of cell panel, centralized DC/AC and also ensure that and be That unites is efficient, but this also causes system redundancy the highest.Photovoltaic micro-inverter can directly and the interface of electrical network Device is integrated in panel backside, and it is easy for installation, hot-swappable, redundancy performance is good, has therefore suffered from extensively Research.
The conventional micro-inverter of isolated form can be divided into without the micro-inverter of DC link and the micro-inverter of band DC link, nothing The micro-inverter of DC link comprises DC/AC changer and AC/AC changer.Wherein AC/AC changer For frequency converter, effect is that high-frequency ac is transformed to industrial frequency AC;And micro-inverter of band DC link It is divided into smooth direct current link and pseudo-DC link two class, compared to the micro-inverter of band DC link, without DC link Micro-inverter power conversion progression is few, and conversion efficiency is high and in widespread attention, but anti-except the most often use Swash formula without the micro-inverter of DC link beyond, seldom have other kinds of without the micro-inverter of DC link, and instead Swash that the efficiency of inverter of declining is relatively low when relatively high power to be constrained it the most further and be widely used;With bridge-type electricity Micro-inverter based on road, inefficient when power is relatively low, constrain its weighting efficiency value so that it is be difficult to Meet the requirement of relevant regulations.
Hence set up micro-inverter structure that a kind of circuit topology is variable so that micro-inverter is at underloading and full load There is different operating circuits, make micro-inverter all obtain high efficiency under different capacity grade, and can facilitate Switching is the main task of the present invention.
Summary of the invention
Goal of the invention: for ensureing that micro-inverter can realize efficient conversion high-power under small-power, carry herein Having gone out micro-inverter that a kind of topology is variable, power works in bridge-type pattern, merit higher than micro-inverter during 100W Rate works in improvement double tube positive exciting pattern less than micro-inverter during 100W, the design ginseng of transformator in the case of two kinds Number is consistent, and the variable micro-inverter of topology is capable of higher weighting efficiency.
Technical scheme:
Micro-inverter that a kind of topology is variable, including input filter capacitor, full-bridge circuit, buffer inductance, high frequency Transformator, cycle rectification circuit and grid-connected filter circuit;Wherein full-bridge circuit is using photovoltaic cell as input electricity Source, and comprise the first switching tube of band anti-paralleled diode, second switch pipe, the 3rd switching tube, the 4th switch Pipe;The source electrode of the first switching tube and the drain electrode of the 3rd switching tube connect, the drain electrode of the first switching tube, second switch The drain electrode of pipe, photovoltaic cell positive pole, the anode of input filter capacitor link together, the source electrode of second switch pipe Drain electrode with the 4th switching tube connects, and the source electrode of the 3rd switching tube, the source electrode of the 4th switching tube, photovoltaic cell are negative Pole, the negative terminal of input filter capacitor link together;
Described buffer inductance one end is connected between the source electrode of the first switching tube and the drain electrode of the 3rd switching tube;Described height Frequency power transformer includes primary side winding and two vice-side winding, and wherein the Same Name of Ends of primary side winding and buffer inductance is another One end connects, and the different name end of primary side winding is connected between the source electrode of second switch pipe and the drain electrode of the 4th switching tube;
Described cycle rectification circuit comprise the 5th switching tube with anti-paralleled diode, the 6th switching tube, the 7th Switching tube, the 8th switching tube, the Same Name of Ends of secondary the first winding and the drain electrode of the 5th switching tube connect, and the 5th opens The source electrode of the source electrode and the 6th switching tube that close pipe connects, the different name end of secondary the second winding and the leakage of the 7th switching tube Pole connects, and the source electrode of the 7th switching tube and the source electrode of the 8th switching tube connect;
Described grid-connected filter circuit includes grid-connected filter capacitor and grid-connected filter inductance, the drain electrode of the 6th switching tube, The drain electrode of the 8th switching tube, the anode of grid-connected filter capacitor, one end of grid-connected filter inductance link together, and The other end of net filter inductance and electrical network live wire connect, the zero line of electrical network, the different name end of secondary the first winding, pair The Same Name of Ends of limit the second winding, the negative terminal of grid-connected filter capacitor link together;
The numerical control device of micro-inverter that a kind of topology is variable, it is characterised in that: include the first voltage sensor Device, the second voltage sensor, the first current sensor, the second current sensor and DSP digitial controller, Wherein DSP digitial controller includes MPPT maximum power point tracking module, phaselocked loop, multiplier, subtractor, PID Actuator, the first polarity recognizer, the second polarity recognizer, the first signal modulator, secondary signal manipulator, First mode selects switch, the second mode selection switch;
The input of the first voltage sensor is connected to the two ends of photovoltaic cell, and the second voltage sensor is connected to electricity The two ends of net, the first current sensor is connected between the first switching tube drain electrode and the anode of photovoltaic cell, and second The input of current sensor and grid-connected filter inductance LgIt is in series;
The first input end of MPPT maximum power point tracking module and the second input connect above-mentioned first electric current respectively and pass The outfan of sensor and the outfan of the first voltage sensor, the input of phaselocked loop connects above-mentioned second voltage sensor The outfan of device, the first input end of multiplier connects the second outfan of MPPT maximum power point tracking module, multiplier Second input termination phaselocked loop outfan, subtractor positive input termination multiplier outfan, subtractor Negative input terminate the outfan of the second current sensor, the outfan of the input termination subtractor of PID regulator, The outfan of PID regulator input with the first signal modulator and secondary signal manipulator respectively is connected, and The first input end of one mode selection switch connects the first outfan of MPPT maximum power point tracking module, and first mode selects Selecting the outfan of second input termination the first signal modulator of switch, first mode selects the 3rd input of switch Termination secondary signal manipulator outfan, the input of the first polarity recognizer and the second polarity recognizer all with The outfan of the second voltage sensor connects, the first input end of the second mode selection switch connect maximum power point with First outfan of track module, the output of second input termination the first polarity recognizer of the second mode selection switch End, the outfan of the 3rd input termination the second polarity recognizer of the second mode selection switch;
When MPPT maximum power point tracking module output power value is higher than 100W, circuit works in bridge-type pattern, the One mode selection switch exports the output signal of the first signal modulator, and this signal controls full-bridge circuit four switch The on off state of pipe, makes four switching tubes all in high-frequency work state;Second mode selection switch output first The output signal of polarity recognizer, this signal controls the on off state of four switching tubes of cycle rectification circuit, when the When one polarity recognizer input is for high level, the 5th switching tube and the 7th switching tube are in opening state, and the 6th opens Close pipe and the 8th switching tube is off state, when the first polarity recognizer input is for low level, the 5th switch Pipe 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 is less than 100W, circuit works in improvement double tube positive exciting Pattern, first mode selects the output signal of switch output secondary signal manipulator, and this signal controls full-bridge circuit The on off state of four switching tubes, makes the first switching tube and the 4th switching tube be in high-frequency work state, makes second Switching tube and the 3rd switching tube are off state;Second mode selection switch exports the defeated of the second polarity recognizer Going out signal, this signal controls the on off state of four switching tubes of cycle rectification circuit, when the second polarity recognizer is defeated When entering for high level, the 5th switching tube is in opening state, the 6th switching tube, the 7th switching tube and the 8th switch Pipe is off state, and when the second polarity recognizer input is for low level, the 8th switching tube is in opening state, 5th switching tube, the 6th switching tube, the 7th switching tube are off state;
The digital control method of micro-inverter that a kind of topology is variable, it is characterised in that: when bridge-type mode of operation, Transformator front stage circuits is output as the high-frequency alternating current of pulse width variability, and four switching tubes of full-bridge circuit are in height Frequently duty;When improving double tube positive exciting mode of operation, full-bridge circuit only two switching tubes are in high frequency work Making state, save the driving loss of two switching tubes, the cycle rectification circuit of transformer secondary is power frequency half Only have a switching tube in cycle and be in opening state, save the switching loss of switching tube and drive loss, having The beneficially lifting of efficiency in the case of small-power.
Beneficial effect: after using such scheme, owing to before transformator, series inductance electric current is crucial controlled quentity controlled variable, and Circuit exports in current source characteristic, and in this changer, all switches all can realize Sofe Switch, and eliminates transformator Secondary commutation diode reverse recovery loss, circuit the most all can realize high-efficiency transfer;By dividing Analysis can also obtain the maximum duty cycle of micro-inverter, the preset value of dutycycle, the current stress of switching tube and Passive option parameter.
Accompanying drawing explanation
Fig. 1 is the variable micro-inverter of the topology of the embodiment of the present invention and numerical control device block diagram thereof;
Fig. 2 is that the embodiment of the present invention is at bridge-type operating mode circuit figure;
Fig. 3 be the embodiment of the present invention when bridge-type mode of operation, the main waveform of a power frequency period internal circuit shows It is intended to;
Fig. 4 is that the embodiment of the present invention is improving double tube positive exciting operating mode circuit figure;
Fig. 5 is the embodiment of the present invention when improving double tube positive exciting mode of operation, the master of a power frequency period internal circuit Want waveform diagram;
Designation in figure: UPVPhotovoltaic cell output voltage;IPVPhotovoltaic cell output electric current;Cin Input filter capacitor;uABBuffer inductance input terminal voltage;S1~S8 the first switching tube is to the 8th Switching tube;L buffer inductance;irBuffer inductance electric current;T high frequency transformer;N transformation Device secondary and the turn ratio on former limit;uw1High frequency transformer original edge voltage;irecTransformer secondary side current; CgGrid-connected filter capacitor;LgGrid-connected filter inductance;iCGrid-connected filter capacitor electric current;ig—— Grid-connected current;ugLine voltage;UPV_fFirst voltage sensor output signal;IPV_fFirst Current sensor output;ug_fSecond voltage sensor output signal;ig_fSecond current sense Device output signal;P MPPT maximum power point tracking module the first output end signal;I* maximum power point with Track module the second output end signal;I* pll output signal;ig* multiplier output signal;ig_e Subtracter output signal;D PID regulator output signal;uS1a~uS4aFirst signal modulator Output signal;uS1b~uS4bSecondary signal manipulator output signal;uS5a~uS8aFirst polarity recognizer Output signal;uS5b~uS8bSecond polarity recognizer output signal;uS1~uS8First switching tube is to The driving signal of eight switching tubes.
Detailed description of the invention
Below in conjunction with specific embodiment, it is further elucidated with the present invention, it should be understood that these embodiments are merely to illustrate this Invention rather than restriction the scope of the present invention, after having read the present invention, those skilled in the art are to this The amendment of the bright various equivalent form of values all falls within the application claims limited range.
As it is shown in figure 1, micro-inverter that a kind of 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, below put up with it mutual Annexation and building block are described in detail.
Full-bridge circuit is using photovoltaic cell as input power, and comprises the first switching tube of band anti-paralleled diode S1, second switch pipe S2, the 3rd switching tube S3, the 4th switching tube S4;The source electrode of S1 and the drain electrode of S3 are even Connect, the drain electrode of S1, the drain electrode of S2, photovoltaic cell positive pole, input filter capacitor CinAnode be connected to one Rising, the source electrode of S2 and the drain electrode of S4 connect, the source electrode of S3, the source electrode of S4, photovoltaic cell negative pole, input Filter capacitor CinNegative terminal link together;Buffer inductance L mono-end be connected on the source electrode of S1 and S3 drain electrode it Between;High frequency transformer T includes primary side winding and two vice-side winding, and wherein the Same Name of Ends of primary side winding eases up The other end rushing inductance L connects, and the different name end of primary side winding is connected to the source electrode and the 4th of second switch pipe and opens Close between the drain electrode of pipe S2 and S4;Cycle rectification circuit comprises the 5th switching tube with anti-paralleled diode S5, the 6th switching tube S6, the 7th switching tube S7, the 8th switching tube S8, the Same Name of Ends of secondary the first winding with The drain electrode of S5 connects, and the source electrode of S5 is connected with the source electrode of S6, the different name end of secondary the second winding and the leakage of S7 Pole connects, and the source electrode of S7 is connected with the source electrode of S8;Grid-connected filter circuit includes grid-connected filter capacitor CgAlso Net filter inductance Lg, the drain electrode of S6, the drain electrode of S8, grid-connected filter capacitor CgAnode, grid-connected filtered electrical Sense LgOne end link together, grid-connected filter inductance LgThe other end and electrical network live wire connect, the zero of electrical network Line, the different name end of secondary the first winding, the Same Name of Ends of secondary the second winding, grid-connected filter capacitor CgNegative terminal Link together.
It is applied to the numerical control device of the variable micro-inverter of topology, it is characterised in that: include that the first voltage passes Sensor, the second voltage sensor, the first current sensor, the second current sensor and DSP are digital control Device, wherein DSP digitial controller include MPPT maximum power point tracking module, phaselocked loop, multiplier, subtractor, PID regulator, the first polarity recognizer, the second polarity recognizer, the first signal modulator, secondary signal are adjusted Device processed, first mode select switch, the second mode selection switch;
The input of the first voltage sensor is connected to the two ends of photovoltaic cell, and the second voltage sensor is connected to electricity The two ends of net, the first current sensor is connected between the first switching tube drain electrode and the anode of photovoltaic cell, and second The input of current sensor and grid-connected filter inductance LgIt is in series;
The first input end of MPPT maximum power point tracking module and the second input connect above-mentioned first electric current respectively and pass The outfan of sensor and the outfan of the first voltage sensor, the input of phaselocked loop connects above-mentioned second voltage sensor The outfan of device, the first input end of multiplier connects the second outfan of MPPT maximum power point tracking module, multiplier Second input termination phaselocked loop outfan, subtractor positive input termination multiplier outfan, subtractor Negative input terminate the outfan of the second current sensor, the outfan of the input termination subtractor of PID regulator, The outfan of PID regulator input with the first signal modulator and secondary signal manipulator respectively is connected, and The first input end of one mode selection switch connects the first outfan of MPPT maximum power point tracking module, and first mode selects Selecting the outfan of second input termination the first signal modulator of switch, first mode selects the 3rd input of switch Termination secondary signal manipulator outfan, the input of the first polarity recognizer and the second polarity recognizer all with The outfan of the second voltage sensor connects, the first input end of the second mode selection switch connect maximum power point with First outfan of track module, the output of second input termination the first polarity recognizer of the second mode selection switch End, the outfan of the 3rd input termination the second polarity recognizer of the second mode selection switch;Work as maximum power point When tracking module output power value is higher than 100W, circuit works in bridge-type pattern, and first mode selects switch defeated Going out the output signal of the first signal modulator, this signal controls the on off state of four switching tubes of full-bridge circuit, makes Four switching tubes are all in high-frequency work state;Second mode selection switch exports the output of the first polarity recognizer Signal, this signal controls the on off state of four switching tubes of cycle rectification circuit, when the first polarity recognizer inputs During for high level, the 5th switching tube and the 7th switching tube are in opening state, the 6th switching tube and the 8th switching tube It is off state, when the first polarity recognizer input is for low level, at the 5th switching tube and the 7th switching tube In off state, the 6th switching tube and the 8th switching tube are in opening state;When MPPT maximum power point tracking module is defeated When going out performance number less than 100W, circuit works in improvement double tube positive exciting pattern, and first mode selects switch output The output signal of secondary signal manipulator, this signal controls the on off state of four switching tubes of full-bridge circuit, makes the One switching tube and the 4th switching tube are in high-frequency work state, make second switch pipe and the 3rd switching tube be off State;Second mode selection switch exports the output signal of the second polarity recognizer, and this signal controls cycle rectification The on off state of four switching tubes of circuit, when the second polarity recognizer input is for high level, at the 5th switching tube In opening state, the 6th switching tube, the 7th switching tube and the 8th switching tube are off state, when the second polarity Evaluator input for low level time, the 8th switching tube is in opening state, the 5th switching tube, the 6th switching tube, 7th switching tube is off state.
Fig. 2 is the present invention equivalent circuit diagram when bridge-type mode of operation, and in a power frequency period, switching tube drives Signal and mains voltage, current waveform figure such as Fig. 3, describe the grid-connected current for obtaining standard in detail in figure ig, buffer inductance input terminal voltage uAB, buffer inductance electric current ir, four switching tubes of cycle rectification circuit drive letter Number over time situation;Fig. 4 is the present invention equivalent circuit diagram when improving double tube positive exciting pattern, one In power frequency period, switching tube drives signal and mains voltage, current waveform figure such as Fig. 5, describes in detail in figure For obtaining grid-connected current i of standardg, two switching tubes of bridge circuit drive signal, buffer inductance electric current ir, week Two switching tubes of ripple rectification circuit drive signal situation over time.
In sum, being applied to the digital control method of the variable micro-inverter of topology, all of switching device is all It is operated in Sofe Switch state;Transformer voltage ratio has different impacts, the most really to the current stress of different switching tubes Fixed moderate transformer voltage ratio;When input power is less than 100W, circuit works in improvement double tube positive exciting pattern, Full-bridge circuit only two switching tubes are in high-frequency work state, save the driving loss of two switching tubes, become The cycle rectification circuit of depressor secondary only has a switching tube in power frequency half period and is in opening state, saves The switching loss of switching tube and drive loss;When input power is higher than 100W, circuit works in bridge-type pattern, Conduction loss is low, iron loss is less, and relative to other existing micro-inverter, topology employed herein is variable Micro-inverter small-power and high-power time have less loss so that it is there is higher weighting efficiency, it is possible to Realize the efficient conversion of electric energy in a power frequency period.

Claims (3)

1. micro-inverter that a topology is variable, it is characterised in that: include input filter capacitor, full-bridge circuit, Buffer inductance, high frequency transformer, cycle rectification circuit and grid-connected filter circuit;Wherein full-bridge circuit is with photovoltaic Battery is as input power, and comprises the first switching tube of band anti-paralleled diode, second switch pipe, the 3rd opens Guan Guan, the 4th switching tube;The source electrode of the first switching tube and the drain electrode of the 3rd switching tube connect, the first switching tube Drain electrode, the drain electrode of second switch pipe, photovoltaic cell positive pole, input filter capacitor CinAnode link together, The drain electrode of the source electrode of second switch pipe and the 4th switching tube connects, the source electrode of the 3rd switching tube, the 4th switching tube Source electrode, photovoltaic cell negative pole, input filter capacitor CinNegative terminal link together;
Described buffer inductance one end is connected between the source electrode of the first switching tube and the drain electrode of the 3rd switching tube;Described height Frequency power transformer includes primary side winding and two vice-side winding, and wherein the Same Name of Ends of primary side winding and buffer inductance is another One end connects, and the different name end of primary side winding is connected between the source electrode of second switch pipe and the drain electrode of the 4th switching tube;
Described cycle rectification circuit comprise the 5th switching tube with anti-paralleled diode, the 6th switching tube, the 7th Switching tube, the 8th switching tube, the Same Name of Ends of secondary the first winding and the drain electrode of the 5th switching tube connect, and the 5th opens The source electrode of the source electrode and the 6th switching tube that close pipe connects, the different name end of secondary the second winding and the leakage of the 7th switching tube Pole connects, and the source electrode of the 7th switching tube and the source electrode of the 8th switching tube connect;
Described grid-connected filter circuit includes grid-connected filter capacitor CgWith grid-connected filter inductance Lg, the 6th switching tube Drain electrode, the drain electrode of the 8th switching tube, grid-connected filter capacitor CgAnode, grid-connected filter inductance LgOne end even It is connected together, grid-connected filter inductance LgThe other end and electrical network live wire connect, the zero line of electrical network, secondary first The different name end of winding, the Same Name of Ends of secondary the second winding, grid-connected filter capacitor CgNegative terminal link together.
2. a numerical control device for micro-inverter that topology as claimed in claim 1 is variable, its feature It is: include the first voltage sensor, the second voltage sensor, the first current sensor, the second current sense Device and DSP digitial controller, wherein DSP digitial controller includes MPPT maximum power point tracking module, phase-locked Ring, multiplier, subtractor, PID regulator, the first polarity recognizer, the second polarity recognizer, the first letter Number manipulator, secondary signal manipulator, first mode select switch, the second mode selection switch;
The input of the first voltage sensor is connected to the two ends of photovoltaic cell, and the second voltage sensor is connected to electricity The two ends of net, the first current sensor is connected between the first switching tube drain electrode and the anode of photovoltaic cell, and second The input of current sensor and grid-connected filter inductance LgIt is in series;
The first input end of MPPT maximum power point tracking module and the second input connect above-mentioned first electric current respectively and pass The outfan of sensor and the outfan of the first voltage sensor, the input of phaselocked loop connects above-mentioned second voltage sensor The outfan of device, the first input end of multiplier connects the second outfan of MPPT maximum power point tracking module, multiplier Second input termination phaselocked loop outfan, subtractor positive input termination multiplier outfan, subtractor Negative input terminate the outfan of the second current sensor, the outfan of the input termination subtractor of PID regulator, The outfan of PID regulator input with the first signal modulator and secondary signal manipulator respectively is connected, and The first input end of one mode selection switch connects the first outfan of MPPT maximum power point tracking module, and first mode selects Selecting the outfan of second input termination the first signal modulator of switch, first mode selects the 3rd input of switch Termination secondary signal manipulator outfan, the input of the first polarity recognizer and the second polarity recognizer all with The outfan of the second voltage sensor connects, the first input end of the second mode selection switch connect maximum power point with First outfan of track module, the output of second input termination the first polarity recognizer of the second mode selection switch End, the outfan of the 3rd input termination the second polarity recognizer of the second mode selection switch;
When MPPT maximum power point tracking module output power value is higher than 100W, circuit works in bridge-type pattern, the One mode selection switch exports the output signal of the first signal modulator, and this signal controls full-bridge circuit four switch The on off state of pipe, makes four switching tubes all in high-frequency work state;Second mode selection switch output first The output signal of polarity recognizer, this signal controls the on off state of four switching tubes of cycle rectification circuit, when the When one polarity recognizer input is for high level, the 5th switching tube and the 7th switching tube are in opening state, and the 6th opens Close pipe and the 8th switching tube is off state, when the first polarity recognizer input is for low level, the 5th switch Pipe 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 is less than 100W, circuit works in improvement double tube positive exciting Pattern, first mode selects the output signal of switch output secondary signal manipulator, and this signal controls full-bridge circuit The on off state of four switching tubes, makes the first switching tube and the 4th switching tube be in high-frequency work state, makes second Switching tube and the 3rd switching tube are off state;Second mode selection switch exports the defeated of the second polarity recognizer Going out signal, this signal controls the on off state of four switching tubes of cycle rectification circuit, when the second polarity recognizer is defeated When entering for high level, the 5th switching tube is in opening state, the 6th switching tube, the 7th switching tube and the 8th switch Pipe is off state, and when the second polarity recognizer input is for low level, the 8th switching tube is in opening state, 5th switching tube, the 6th switching tube, the 7th switching tube are off state.
3. the digital control method of micro-inverter that a topology is variable, it is characterised in that: at bridge-type Working mould During formula, transformator front stage circuits is output as the high-frequency alternating current of pulse width variability, and four switching tubes of full-bridge circuit are equal It is in high-frequency work state;When improving double tube positive exciting mode of operation, full-bridge circuit only two switching tubes are in High-frequency work state, saves the driving loss of two switching tubes, and the cycle rectification circuit of transformer secondary is in work Frequently only have a switching tube in half period and be in opening state, save the switching loss of switching tube and drive damage Consumption, the beneficially lifting of efficiency in the case of small-power.
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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
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
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
CN107516994A (en) * 2017-10-10 2017-12-26 厦门市爱维达电子有限公司 A kind of self-powered inverter IGBT drive devices based on Magnetic isolation
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