CN106374770A - Input and output common-ground boost-buck photovoltaic grid-connected inverter and control method thereof - Google Patents

Input and output common-ground boost-buck photovoltaic grid-connected inverter and control method thereof Download PDF

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Publication number
CN106374770A
CN106374770A CN201610960116.9A CN201610960116A CN106374770A CN 106374770 A CN106374770 A CN 106374770A CN 201610960116 A CN201610960116 A CN 201610960116A CN 106374770 A CN106374770 A CN 106374770A
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Prior art keywords
switching tube
switch pipe
inductance
input
diode
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王立乔
刘乐
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Yanshan University
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Yanshan University
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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
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • 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
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

The invention discloses an input and output common-ground boost-buck photovoltaic grid-connected inverter and a control method thereof. The photovoltaic grid-connected inverter disclosed by the invention comprises five switch tubes, three diodes, two inductors and a capacitor. The input and output common-ground boost-buck photovoltaic grid-connected inverter has the beneficial effects that voltage at two ends of a ground parasitic capacitor of a photovoltaic cell panel is zero and remains unchanged; leakage current is effectively eliminated; input and output of the inverter are common-grounded and are beneficial to building of a three-phase system and the applications of the inverter can be further expanded; boosting and bucking can be achieved by a single stage of the inverter, the grid-connected voltage requirement can be achieved by a DC side only by low voltage and the application range of the inverter is expanded; a transformer does not exist in a circuit, the required active and passive devices are few and a system is high in efficiency, small in volume and light in weight; and an electrolytic capacitor does not exist in the circuit, the reliability of the circuit is improved and the service life of the circuit is prolonged.

Description

Input and output liftable die mould photovoltaic combining inverter and its control method altogether
Technical field
The invention belongs to electric and electronic technical field and in particular to a kind of input and output liftable die mould is grid-connected altogether Inverter.
Background technology
The traditional energy such as increasingly depleted such as coal, oil, natural gas, calculates according to the reserves verified at present and consumption level, Oil can be with 30 to 50 years, and natural gas can be with 60 to 80 years, and coal can use about 100 to 200 years, and generally fossil energy is also available for The mankind use 100 years about.Additionally, a large amount of uses of fossil energy, cause severe environmental pollution, and aggravate greenhouse effect.Cause The task that this taps a new source of energy is very urgent.Compared with traditional fossil energy, as a kind of new forms of energy, having can be again for solar energy Raw, cleaning, reliable, the no advantage of greenhouse gas emission, is currently to widely use, and has the renewable energy of good development prospect Source.The acquisition of solar energy depends on photovoltaic generating system, and in photovoltaic generating system, photovoltaic combining inverter is connection solar energy Cell panel and the pith of electrical network, are the key technologies in photovoltaic generating system.In photovoltaic generating system, one good Photovoltaic combining inverter should have the advantages that high security, high efficiency, low cost, small size, light weight.
In view of safety factorss, traditional photovoltaic combining inverter needs to be isolated, and isolation has two methods: Yi Zhongtong Cross and Industrial Frequency Transformer is set in grid side, but Industrial Frequency Transformer is bulky, reduces the power density of system, simultaneously transformation Use make system effectiveness reduce；Another kind of method is to use high frequency transformer in DC side, although high frequency transformer volume Less than Industrial Frequency Transformer with expense, but this way increased the power series of system, and the loss of transformator leads to system to be imitated Rate reduces.Statistical data shows: if removed the transformator in system, the efficiency of system can improve 1%-2%, may be used simultaneously To improve the power density of system, reduce the cost of system.
Because traditional photovoltaic combining inverter has the shortcomings that above-mentioned, non-isolated photovoltaic grid-connected inverter is sent out in recent years Exhibition is rapid.Compared with conventional photovoltaic combining inverter, non-isolated photovoltaic grid-connected inverter has many advantages, such as: non-isolation type is inverse Become device without transformator, improve system effectiveness, reduce system weight, reduce system bulk, and be easy to the peace of system Dress.But due to eliminating transformator, there is leakage problem in non-isolated photovoltaic grid-connected inverter, there is potential safety hazard, this Outer leakage current can increase harmonic current and system loss, causes electromagnetic interference problem.So suppression leakage current is non-isolation type light One important technology of volt combining inverter.
The non-isolated photovoltaic grid-connected inverter having been proposed that mainly has two kinds, and one kind is symmetrical inductance configuration circuit knot Structure, the switching tube that this circuit needs and passive device are more, and system effectiveness and reliability be not high；Another kind is asymmetric inductance Configuration circuit structure, typical such as semi-bridge type circuit, need two electrochemical capacitors, increased volume and the cost of system, reduce The reliability of system.And the photovoltaic combining inverter having been proposed that mostly can only blood pressure lowering it is impossible to boosting, the applicable model of circuit Enclose wideless.
The circuit structure that the present invention provides is different from both the above circuit, grid side and DC side in circuit of the present invention first Power cathode is joined directly together, and it is zero that common-mode voltage is clamped, and keeps constant, it is thus eliminated that leakage current；Secondly circuit of the present invention Using the configuration of asymmetric inductance, circuit no electrolytic capacitor, it is simple therefore to have a structure, efficiency high, highly reliable advantage；Then Circuit single-stage of the present invention can achieve buck, expands the scope of application of circuit；Last circuit input and output of the present invention are altogether, sharp In building three-phase system, can expansive approach occasion further.
Content of the invention
Goal of the invention: the problem existing for current technology, the invention provides a kind of input and output lifting press altogether Type photovoltaic combining inverter.This circuit input and output altogether, can build three-phase system, and application scenario is wide；Grid side and DC side Power cathode is joined directly together, and eliminates leakage current；Circuit no electrolytic capacitor, passive and active device is all less, and structure is simple, high Effect, highly reliable；Circuit single-stage can achieve buck, has expanded the scope of application of circuit.
In order to reach above-mentioned goal of the invention, present invention employs following technical scheme:
A kind of input and output liftable die mould photovoltaic combining inverter altogether, this inverter include five switching tubes, three Diode, two inductance and an electric capacity, the 5th switching tube s5Colelctor electrode and dc bus "+" end is connected, the 5th switching tube s5 Emitter stage and the second diode vd2Negative electrode, DC inductance ldcOne end and the 3rd switching tube s3Source electrode be connected to section Point m；First switch pipe s1The "-" end of source electrode and dc bus, the 3rd diode vd3Anode, filter capacitor c1One end with And electrical network uabA end connect, first switch pipe s1Drain electrode and DC inductance ldcThe other end and the first diode vd1Anode even It is connected to node n；3rd switching tube s3Drain electrode and the 3rd diode vd3Negative electrode connect；First diode vd1Negative electrode and Two switching tube s2Drain electrode connect, the second diode vd2Anode and the 4th switching tube s4Source electrode connect, second switch pipe s2 Source electrode and the 4th switching tube s4Drain electrode, filter capacitor c1The other end and filter inductance l1The other end connect, filtered electrical Sense l1The other end and electrical network uabB end connect.
Present invention also offers a kind of control method of described input and output liftable die mould photovoltaic combining inverter altogether, This control method includes following four mode of operation:
The positive half cycle charge mode of (a) mode of operation 1: in this state, first switch pipe s1, the 4th switching tube s4With 5th switching tube s5Open-minded, second switch pipe s2With the 3rd switching tube s3Turn off, DC inductance ldcThe path of charging current is: straight Stream bus "+" end the → the five switching tube s5→ DC inductance ldc→ first switch pipe s1→ dc bus "-" end → dc bus "+", holds, filter capacitor c simultaneously1To electrical network uabPower supply；
The positive half cycle discharge mode of (b) mode of operation 2: in this state, first switch pipe s1With the 4th switching tube s4Open Logical, second switch pipe s2, the 3rd switching tube s3With the 5th switching tube s5Turn off, the path of grid-connected current is: n → the first opens node Close pipe s1→ electrical network uab→ filter inductance l1→ second switch pipe s4→ the second diode vd2→ node m → DC inductance ldc→ section Point n；
(c) mode of operation 3 negative half period charge mode: in this state, first switch pipe s1, second switch pipe s2With Second switch pipe s5Open-minded, second switch pipe s3With second switch pipe s4Turn off, DC inductance ldcThe path of charging current is: straight Stream bus "+" end → second switch pipe s5→ DC inductance inductance ldc→ second switch pipe s1→ dc bus "-" end → direct current Bus "+" end, filter capacitor c simultaneously1To electrical network uabNegative pole is powered；
(d) mode of operation 4 negative half period discharge mode: in this state, second switch pipe s2With the 3rd switching tube s3Open Logical, first switch pipe s1, the 4th switching tube s4With the 5th switching tube s5Turn off, the path of grid-connected current is: node n → one or two Pole pipe vd1→ the four switching tube s4→ second switch pipe s2→ filter inductance inductance l1→ electrical network uab→ the three diode vd3→ the Three switching tube s3→ node m → DC inductance ldc→ node n.
Due to adopting technique scheme, the present invention compared with prior art has the advantages that
Inverter grid side of the present invention is directly connected with dc bus negative pole, the parasitic capacitance two ends common mode of Photovoltaic array Voltage is zero, and keeps constant, therefore leakage current problem；
Inverter input and output of the present invention altogether, beneficial to building three-phase system, can expansive approach occasion further；
Inverter of the present invention can be equivalent to the input-series and output-parallel type group being made up of two buck-boost circuit Close circuit: export positive half cycle, first switch pipe s1, the 4th switching tube s4, the 5th switching tube s5, the second diode vd2, unidirectional current Sense ldc, filter capacitor c1, filter inductance l1One buck-boost circuit of composition simultaneously produces the positive half cycle half-sinusoid of output；Output Negative half period, first switch pipe s1, second switch pipe s2, the 3rd switching tube s3, the 5th switching tube s5, the first diode vd1, the three or two Pole pipe vd3, DC inductance ldc, filter capacitor c1, filter inductance l1One buck-boost circuit of composition simultaneously produces output negative half period Half-sinusoid, positive and negative two half-sinusoids, thus synthesizing ac output voltage, inverter therefore of the present invention has buck-boost concurrently The characteristic of circuit, the circuit parameter selection principle in buck-boost circuit can be transplanted in this inverter, and circuit parameter selects Take simple, be easy to design；
Present invention only requires five switching tubes, three diodes, two inductance, an electric capacity, circuit structure is simple, efficiency High, highly reliable；
Inverter of the present invention has the ability of buck, and DC side only needs to a low-voltage and can achieve that grid-connected voltage will Ask, inverter is applied widely；
Inverter of the present invention only needs an ac filter electric capacity, representative value 2uf～5uf, without electrochemical capacitor in inverter, Therefore circuit small volume, efficiency high, reliable operation, life-span length；
Brief description
Fig. 1 be the present invention a kind of input and output altogether liftable die mould photovoltaic combining inverter circuit structure illustrate Figure；
Fig. 2 is a kind of input and output liftable die mould photovoltaic combining inverter switch control logic altogether of the present invention；
Fig. 3 is a kind of Working mould of input and output of present invention control method of liftable die mould photovoltaic combining inverter altogether Formula 1；
Fig. 4 is a kind of Working mould of input and output of present invention control method of liftable die mould photovoltaic combining inverter altogether Formula 2；
Fig. 5 is a kind of Working mould of input and output of present invention control method of liftable die mould photovoltaic combining inverter altogether Formula 3；
Fig. 6 is a kind of Working mould of input and output of present invention control method of liftable die mould photovoltaic combining inverter altogether Formula 4；
Fig. 7 is a kind of input and output three-phase system that liftable die mould photovoltaic combining inverter builds altogether of the present invention；
Fig. 8 is the grid-connected waveform of photovoltaic combining inverter of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is further described in detail.
A kind of input and output of present invention liftable die mould photovoltaic combining inverter altogether, as shown in figure 1, include five open Guan Guan, three diodes, two inductance and an electric capacity, the 5th switching tube s5Colelctor electrode and dc bus "+" end is connected, the Five switching tube s5Emitter stage and the second diode vd2Negative electrode, DC inductance ldcOne end and the 3rd switching tube s3Source electrode It is connected to node m；First switch pipe s1The "-" end of source electrode and dc bus, the 3rd diode vd3Anode, filter capacitor c1 One end and electrical network uabA end connect, first switch pipe s1Drain electrode and DC inductance ldcThe other end and the first diode vd1 Anode be connected to node n；3rd switching tube s3Drain electrode and the 3rd diode vd3Negative electrode connect；First diode vd1's Negative electrode and second switch pipe s2Drain electrode connect, the second diode vd2Anode and the 4th switching tube s4Source electrode connect, second Switching tube s2Source electrode and the 4th switching tube s4Drain electrode, filter capacitor c1The other end and filter inductance l1The other end even Connect, filter inductance l1The other end and electrical network uabB end connect.
A kind of input and output of present invention liftable die mould photovoltaic combining inverter switch control logic such as Fig. 2 institute altogether Show, grid-connected current positive half period first switch pipe s1, the 4th switching tube s4Conducting, second switch pipe s2, the 3rd switching tube s3Close Disconnected, the 5th switching tube s5Its on or off is controlled using pwm；Grid-connected current negative half-cycle first switch pipe s2Conducting, the 4th opens Close pipe s4Turn off, first switch pipe s1, the 3rd switching tube s3, the 5th switching tube s5Its on or off is controlled using pwm.
A kind of control method of described input and output liftable die mould photovoltaic combining inverter altogether, this control method includes Following four mode of operation:
The positive half cycle charge mode of (a) mode of operation 1: as shown in figure 3, in this state, first switch pipe s1, the 4th Switching tube s4, the 5th switching tube s5Open-minded, second switch pipe s2, the 3rd switching tube s3Turn off, power supply is to DC inductance ldcCharge, DC inductance ldcElectric current il1Linear rise, filter capacitor c simultaneously1Maintain output voltage substantially constant and to electrical network uabPower supply, Electric current is ilo, DC inductance ldcThe path of charging current is: dc bus "+" end the → the five switching tube s5→ DC inductance ldc → first switch pipe s1→ dc bus "-" end → dc bus "+" end；
The positive half cycle discharge mode of (b) mode of operation 2: as shown in figure 4, in this state, first switch pipe s1With Four switching tube s4Open-minded, second switch pipe s2, the 3rd switching tube s3, the 5th switching tube s5Turn off, DC inductance ldcThe energy of middle storage Measure to electrical network uabPower supply, the path of grid-connected current is: node n → first switch pipe s1→ electrical network uab→ filter inductance l1→ the first Switching tube s4→ the second diode vd2→ node m → DC inductance ldc→ node n；
(c) mode of operation 3 negative half period charge mode: as shown in figure 5, in this state, first switch pipe s1, Two switching tube s2, the 5th switching tube s5Open-minded, the 3rd switching tube s3, the 4th switching tube s4Turn off, power supply is to DC inductance ldcFill Electricity, DC inductance ldcElectric current il1Linear rise, filter capacitor c simultaneously1Maintain output voltage substantially constant and to electrical network uabFor Electricity, electric current is ilo, DC inductance ldThe path of charging current is: dc bus "+" end the → the five switching tube s5→ DC inductance ldc→ first switch pipe s1→ dc bus "-" end → dc bus "+" end；
(d) mode of operation 4 negative half period discharge mode: as shown in fig. 6, in this state, second switch pipe s2, the 3rd Switching tube s3Open-minded, first switch pipe s1, the 4th switching tube s4, the 5th switching tube s5Turn off, DC inductance ldcThe energy of middle storage To electrical network uabPower supply, the path of grid-connected current is: node n → the first diode vd1→ the four switch closes s4→ second switch pipe s2 → filter inductance l1→ electrical network uab→ the three diode vd3→ the three switching tube s3→ node m → DC inductance ldc→ node n.
Above four operation modes can be represented with table 1,
The power tube switch combination state of table 1 photovoltaic combining inverter
uab s1 s2 s3 s4 s5 Respective figure
>0 1 0 0 1 1 Fig. 3
>0 1 0 0 1 0 Fig. 4
<0 1 1 0 0 5 Fig. 5
<0 0 1 1 0 0 Fig. 6
It is a kind of input and output three-phase system that liftable die mould photovoltaic combining inverter builds altogether of the present invention shown in Fig. 7 System；
For realizing above operation principle, the present invention uses current double closed-loop control, chooses output current and unidirectional current Inducing current, as feedback signal, is multiplied by after certain coefficient compared with Setting signal, the adjusted device of error amount adjust after with triangle Bob relatively produces pulse signal and determines opening and turning off of switch, and final grid-connected waveform is as shown in Figure 8.

Claims (6)

1. a kind of input and output altogether liftable die mould photovoltaic combining inverter it is characterised in that: this inverter includes five and opens Guan Guan, three diodes, two inductance and an electric capacity, the 5th switching tube s5Colelctor electrode and dc bus "+" end is connected, the Five switching tube s5Emitter stage and the second diode vd2Negative electrode, DC inductance ldcOne end and the 3rd switching tube s3Source electrode It is connected to node m；First switch pipe s1The "-" end of source electrode and dc bus, the 3rd diode vd3Anode, filter capacitor c1 One end and electrical network uabA end connect, first switch pipe s1Drain electrode and DC inductance ldcThe other end and the first diode vd1 Anode be connected to node n；3rd switching tube s3Drain electrode and the 3rd diode vd3Negative electrode connect；First diode vd1's Negative electrode and second switch pipe s2Drain electrode connect, the second diode vd2Anode and the 4th switching tube s4Source electrode connect, second Switching tube s2Source electrode and the 4th switching tube s4Drain electrode, filter capacitor c1The other end and filter inductance l1The other end even Connect, filter inductance l1The other end and electrical network uabB end connect.
2. the control method of a kind of input and output according to claim 1 liftable die mould photovoltaic combining inverter altogether, It is characterized in that: this control method includes following four mode of operation:
The positive half cycle charge mode of (a) mode of operation 1: in this state, first switch pipe s1, the 4th switching tube s4With the 5th Switching tube s5Open-minded, second switch pipe s2With the 3rd switching tube s3Turn off, DC inductance ldcThe path of charging current is: direct current is female Line "+" end the → the five switching tube s5→ DC inductance ldc→ first switch pipe s1→ dc bus "-" end → dc bus "+" End, filter capacitor c simultaneously1To electrical network uabPower supply；
The positive half cycle discharge mode of (b) mode of operation 2: in this state, first switch pipe s1With the 4th switching tube s4It is open-minded, Second switch pipe s2, the 3rd switching tube s3With the 5th switching tube s5Turn off, the path of grid-connected current is: node n → first switch pipe s1→ electrical network uab→ filter inductance l1→ second switch pipe s4→ the second diode vd2→ node m → DC inductance ldc→ node n；
(c) mode of operation 3 negative half period charge mode: in this state, first switch pipe s1, second switch pipe s2With second Switching tube s5Open-minded, second switch pipe s3With second switch pipe s4Turn off, DC inductance ldcThe path of charging current is: direct current is female Line "+" end → second switch pipe s5→ DC inductance inductance ldc→ second switch pipe s1→ dc bus "-" end → dc bus "+", holds, filter capacitor c simultaneously1To electrical network uabNegative pole is powered；
(d) mode of operation 4 negative half period discharge mode: in this state, second switch pipe s2With the 3rd switching tube s3It is open-minded, First switch pipe s1, the 4th switching tube s4With the 5th switching tube s5Turn off, the path of grid-connected current is: node n → the first diode vd1→ the four switching tube s4→ second switch pipe s2→ filter inductance inductance l1→ electrical network uab→ the three diode vd3→ the three opens Close pipe s3→ node m → DC inductance ldc→ node n.
3. as claimed in claim 1 a kind of input and output altogether liftable die mould photovoltaic combining inverter it is characterised in that electricity Net side is directly connected with dc bus negative pole, and the parasitic capacitance two ends common-mode voltage of Photovoltaic array is zero, and keeps constant, because This leakage current problem.
4. as claimed in claim 1 a kind of input and output altogether liftable die mould photovoltaic combining inverter it is characterised in that hand over The output of stream side and DC side input altogether.
5. as claimed in claim 1 a kind of input and output altogether liftable die mould photovoltaic combining inverter it is characterised in that defeated Enter voltage udcCan be less than can be higher than also output AC voltage peak value.
6. as claimed in claim 1 a kind of input and output altogether liftable die mould photovoltaic combining inverter it is characterised in that electricity Road no electrolytic capacitor.
CN201610960116.9A 2016-10-28 2016-10-28 Input and output common-ground boost-buck photovoltaic grid-connected inverter and control method thereof Pending CN106374770A (en)

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CN106787900A (en) * 2017-03-27 2017-05-31 盐城工学院 Boosting combining inverter and its control method
CN107086807A (en) * 2017-07-04 2017-08-22 安徽工业大学 A kind of boosting inverter
CN107147319A (en) * 2017-07-18 2017-09-08 安徽理工大学 Non-isolated grid-connected inverter, grid-connected photovoltaic system and control method
CN107359783A (en) * 2017-07-06 2017-11-17 中国计量大学 A kind of multi-functional convertor circuit and its control method
CN107809182A (en) * 2017-10-31 2018-03-16 上海海事大学 A kind of buck-boost grid-connected inverter
CN107979297A (en) * 2017-12-06 2018-05-01 上海海事大学 A kind of AC/DC current transformers based on multiplexing inductance
CN108964497A (en) * 2017-05-19 2018-12-07 丰郅(上海)新能源科技有限公司 Inhibit the inversion system of common mode interference
CN109194175A (en) * 2018-08-27 2019-01-11 江苏大学 A kind of non-isolated grid-connected inverter circuit of type leakage current and control method altogether
CN109980978A (en) * 2019-04-01 2019-07-05 安徽工业大学 A kind of converter and its modulator approach
CN111697859A (en) * 2020-07-03 2020-09-22 安徽工业大学 Buck-boost inverter and control method thereof
CN113595427A (en) * 2021-07-23 2021-11-02 南京信息工程大学 Double-input double-boosting leakage-free inverter and control circuit and method thereof
CN113659863A (en) * 2021-08-24 2021-11-16 燕山大学 Double-end common-ground inverter

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