WO2013004110A1 - Convertisseur à transfert indirect parallèle entrelacé pour système photovoltaïque solaire connecté au réseau - Google Patents

Convertisseur à transfert indirect parallèle entrelacé pour système photovoltaïque solaire connecté au réseau Download PDF

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Publication number
WO2013004110A1
WO2013004110A1 PCT/CN2012/075866 CN2012075866W WO2013004110A1 WO 2013004110 A1 WO2013004110 A1 WO 2013004110A1 CN 2012075866 W CN2012075866 W CN 2012075866W WO 2013004110 A1 WO2013004110 A1 WO 2013004110A1
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WO
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Prior art keywords
current
reference current
primary
quasi
circuit
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PCT/CN2012/075866
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English (en)
Chinese (zh)
Inventor
罗宇浩
高明智
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浙江昱能光伏科技集成有限公司
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Publication of WO2013004110A1 publication Critical patent/WO2013004110A1/fr

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Classifications

    • 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
    • H02M7/4807—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 having a high frequency intermediate AC stage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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

Definitions

  • the invention relates to the technical field of solar photovoltaic grid-connected inverters.
  • the invention relates to a solar photovoltaic grid-connected staggered parallel flyback inverter. Background technique
  • the output current of the grid-tied inverter is usually mismatched with the sine wave shape of the grid current.
  • the total Harmonic Distortion (THD) is usually used to define the size of the mismatch.
  • Total Harmonic Distortion THD is defined as the square root of the ratio of the total rms value of the output harmonics to the rms value of the fundamental power input to the cosine signal of a single frequency. In order to ensure the stability of the grid and the efficient entry of the inverter into the grid, THD is usually required to be less than 5%.
  • the control of the flyback inverter generally adopts a reference current mode, and the peak envelope of the primary current is used as the reference current I.
  • the flyback inverter circuit when the flyback operation is in the Bomidary Conducting Mode (BCM), since the flyback operating frequency is not fixed, the peak envelope of the primary current (ie, I ref ) and the original The effective value of the side current is nonlinear, and thus the effective value of the push-out and output current is nonlinear.
  • BCM Bomidary Conducting Mode
  • FIG. 1 is a schematic diagram of a simple circuit of a solar photovoltaic grid-connected staggered flyback inverter in the prior art.
  • the solar photovoltaic grid-connected staggered flyback inverter 100 is connected to the solar panel 101 on the left side and the grid 102 on the right side, respectively.
  • the flyback inverter portion 100 is composed of a decoupling capacitor Cin, an interleaved parallel flyback circuit 103, and a power frequency grid-connected inverter circuit 104.
  • the interleaved parallel flyback circuit 103 has two identical flyback circuits connected in parallel, each of which is mainly composed of primary side switching tubes S M1 and S M1 , transformers T1 and T2 , and flyback diodes D 1 and D2 .
  • the output of the flyback current is determined by the control of the switching tubes S AC1 ⁇ S AC4 .
  • the interleaved parallel flyback circuit 103 includes a switching transistor S M1 /S M2 , a transformer T1/T2 and a flyback diode D l/D2.
  • the power frequency grid-connected inverter includes a full bridge and filter circuits L f , C f composed of four switch tubes S AC1 ⁇ S AC4 .
  • the technical problem to be solved by the present invention is to provide a solar photovoltaic grid-connected staggered parallel flyback inverter, and improve the calculation method of the reference current to ensure that the grid-connected current is a sinusoidal waveform with the same frequency as the grid voltage, thereby greatly reducing and The total harmonic distortion of the grid current improves the quality of the output power.
  • the present invention provides a solar photovoltaic grid-connected staggered parallel flyback inverter, including:
  • An interleaved parallel flyback circuit comprising a primary winding and a secondary winding, the primary winding being connected to a solar panel, the secondary winding being connected to the grid for paralleling the DC generated by the solar panel After the flyback, the output is connected to the grid;
  • a DC detection module is connected to the solar panel for detecting a DC signal generated by the DC panel; and an AC detection module is connected to the secondary winding of the interleaved flyback circuit for detecting an AC signal connected to the grid ;
  • a reference current obtaining module is respectively connected to the DC detecting module and the AC detecting module, and configured to acquire a reference current at each time point according to the DC signal and the AC signal;
  • a quasi-resonant control circuit is connected to the switching tube of the primary winding of the interleaved parallel flyback circuit for sampling a drain-source voltage of the switching transistor, and comparing whether the drain-source voltage is equal to a quasi-resonant threshold;
  • the driving circuit includes:
  • a comparator respectively connected to the reference current acquisition module and the primary current sampling module, for comparing whether the primary current is equal to the reference current
  • a flip-flop respectively connected to the comparator, the quasi-resonant control circuit and the switching tube of the primary winding, for driving the switch when the primary current increases to be equal to the reference current Turning off, and when the drain-source voltage of the switch tube drops to be equal to the quasi-resonance threshold, the switch tube is driven to turn on.
  • the reference current is:
  • i c is the DC input voltage, which is the value of the AC output voltage
  • 1 A is the value of the AC output current
  • ⁇ is the phase of the AC output voltage, which is the primary winding
  • 2 is the inductance value of the secondary winding
  • t is the time in one cycle.
  • the quasi-resonance control circuit when the drain-source voltage of the switch tube is higher than the quasi-resonance threshold, the quasi-resonance control circuit outputs 0; when the drain-source voltage of the switch tube falls to be equal to the quasi-resonance threshold The quasi-resonance control circuit outputs 1 .
  • the driving circuit further includes:
  • Diodes are respectively connected to the flip-flops and the switching tubes of the primary windings for ensuring that the driving signals are in a forward flow direction.
  • the invention also provides a solar photovoltaic grid-connected staggered parallel flyback inverter, comprising:
  • An interleaved parallel flyback circuit comprising a plurality of primary windings and a secondary winding, wherein the primary winding is connected to a solar panel, and one of the secondary windings is connected to a power grid, and the interleaved parallel flyback circuit is used And parallelizing the direct current generated by the solar panel to be connected to the grid;
  • a DC detection module connected to the solar panel, for detecting a DC signal generated by the DC panel; and an AC detection module connected to a secondary winding connected to the grid in the interleaved flyback circuit, Detecting the AC signal of the grid connection;
  • a reference current obtaining module is respectively connected to the DC detecting module and the AC detecting module, and configured to acquire a reference current at each time point according to the DC signal and the AC signal;
  • a quasi-resonant control circuit connected to another secondary winding of the interleaved flyback circuit for sampling a voltage generated by a current of the secondary winding, and comparing whether a sampling voltage of the secondary current is equal to a command;
  • the driving circuit includes:
  • a comparator respectively connected to the reference current acquisition module and the primary current sampling module, for comparing whether the primary current is equal to the reference current
  • a flip-flop respectively connected to the comparator, the quasi-resonant control circuit and the switching tube of the primary winding, for driving the switch when the primary current increases to be equal to the reference current Turning off, and when the sampling voltage of the secondary current drops to be equal to zero, the switching transistor is driven to be turned on.
  • the reference current acquisition module acquires the reference current according to the following formula: Where is the reference current at each time point, i c is the DC input voltage, which is the value of the AC output voltage, 1 A is the value of the AC output current, and ⁇ is the phase of the AC output voltage, which is the inductance value of the primary winding 2 is the inductance value of the secondary winding, and t is the time in one cycle.
  • the quasi-resonant control circuit is a voltage comparator.
  • the quasi-resonant control circuit when the sampling voltage of the secondary current drops to equal to 0, the quasi-resonant control circuit outputs 0; otherwise, the quasi-resonant control circuit outputs 1 .
  • the driving circuit further includes:
  • Diodes are respectively connected to the flip-flops and the switching tubes of the primary windings for ensuring that the driving signals are in a forward flow direction.
  • the present invention has the following advantages:
  • the invention uses the reference current control flyback inverter for energy conversion, and ensures the calculation method of the reference current and the hardware control circuit in the two-stage topology of the interleaved parallel flyback circuit and the power frequency grid-connected inverter circuit.
  • the grid-connected current is a sinusoidal waveform with the same frequency as the grid voltage, which greatly reduces the total harmonic distortion of the grid-connected current and improves the output power quality.
  • FIG. 1 is a schematic diagram of a simple circuit of a solar photovoltaic grid-connected staggered flyback inverter in the prior art
  • FIG. 2 is a schematic diagram showing waveforms of a primary current, a secondary current, and a primary side switching tube control signal of a solar photovoltaic grid-connected parallel-connected flyback inverter according to an embodiment of the present invention
  • FIG. 3 is a simplified schematic diagram of a solar photovoltaic grid-connected staggered flyback inverter according to an embodiment of the present invention
  • FIG. 4 is a simplified schematic diagram of a solar photovoltaic grid-connected staggered flyback inverter according to another embodiment of the present invention. detailed description
  • FIG. 2 is a schematic diagram showing waveforms of a primary current, a secondary current, and a primary side switching tube control signal of a solar photovoltaic grid-connected parallel-connected flyback inverter according to an embodiment of the present invention.
  • the solar photovoltaic grid-connected staggered flyback inverter 300 can include: an interleaved parallel flyback circuit 301, a DC detection module 302, an AC detection module 303, a reference current acquisition module 304, a quasi-resonance control circuit 305, The primary current sampling module 306 and the driving circuit 307, wherein the driving circuit 307 may further include: a comparator 308 and a trigger 309.
  • the interleaved parallel flyback circuit 301 may include a primary winding 301 1 and a secondary winding 3012.
  • the primary winding 301 1 is connected to a solar panel (not shown, only represented by a DC source DC).
  • the side winding 3012 is connected to the grid 31 1 for parallel excitation of the DC power generated by the solar panel and then connected to the grid;
  • the DC detection module 302 can be connected to the solar panel for detecting the DC signal generated by the DC panel;
  • the detecting module 303 can be connected to the secondary winding 3012 of the interleaved flyback circuit 301 for detecting the connected alternating current signal;
  • the reference current obtaining module 304 can be respectively connected to the direct current detecting module 302 and the alternating current detecting module 303.
  • the quasi-resonant control circuit 305 can be connected to the switching transistor S M of the primary winding 301 1 of the interleaved flyback circuit 301 for sampling the drain-source voltage of the switching transistor S M and comparing whether the drain-source voltage is equal to a quasi-resonance threshold, when the drain-source voltage of the switch S M is higher than the quasi-resonance threshold, the output of the quasi-resonant control circuit 305 is 0; when the drain-source voltage of the switch S M falls to be equal to the quasi-resonant threshold, the quasi-resonant control circuit 305 output is 1; the primary current sampling module 306 can be winding and is connected to the primary 3011, 3011 for the current sample of the primary winding; and a driving circuit 307 for the original winding 3011 generates switch S M Drive signal that is turned on or off.
  • the comparator 308 in the driving circuit 307 can be respectively connected to the reference current obtaining module 304 and the primary current sampling module 306 for comparing whether the primary current is equal to the reference current; and the flip-flop 309 can be respectively connected to the comparator 308, when the quasi-resonant control circuit 305 and a primary winding switch S M 301 1 is connected, for, when the primary current equal to the reference current is increased, the driving switch S M is off, and when the drain-source voltage of the switch S M When falling to the quasi-resonance threshold, the drive switch S M is turned on.
  • the reference current I ref is taken.
  • ⁇ is the reference current at each time point, is the DC input voltage
  • ⁇ is the value of the AC output voltage
  • ⁇ is the value of the AC output current
  • ⁇ is the phase of the AC output voltage
  • t is the time in one cycle.
  • the following signals are obtained by the DC detection module 302: The DC input voltage V dc supplied from the input voltage detection circuit.
  • the following signals are obtained by the AC detection module 303: the value of the AC output voltage supplied by the output voltage detection circuit Vp , the phase ⁇ of the AC output voltage supplied from the output voltage detection circuit, and the value of the AC output current supplied by the output current detection circuit.
  • the reference current value I ref at each time point can be conveniently calculated.
  • the drive circuit 307 of this embodiment may further include a diode 310 which are connected to the flip-flop 309 and the primary winding switch S M 301 1 for ensuring the flow of the forward drive signal is to avoid reverse flow of the signal Possible damage to the drive circuit 307.
  • a diode 310 which are connected to the flip-flop 309 and the primary winding switch S M 301 1 for ensuring the flow of the forward drive signal is to avoid reverse flow of the signal Possible damage to the drive circuit 307.
  • the solar photovoltaic grid-connected staggered flyback inverter 400 can include: interleaved parallel The flyback circuit 401, the DC detection module 402, the AC detection module 403, the reference current acquisition module 404, the quasi-resonance control circuit 405, the primary current sampling module 406, and the driving circuit 407, wherein the driving circuit 407 may further include: a comparator 408, Trigger 409.
  • the interleaved parallel flyback circuit 401 may include a plurality of primary windings 401 1 and secondary windings 4012, Ls2, primary windings 401 1 and solar panels (not shown, only represented by DC source DC) Connected, one of the secondary windings 4012 is connected to the grid 41 1 , and the staggered parallel flyback circuit 401 is used for parallel excitation of the DC power generated by the solar panel and then connected to the grid;
  • the DC detection module 402 can be combined with the solar panel Connected to detect the DC signal generated by the AC detection module 403, which can be connected to the secondary winding 4012 connected to the grid 411 in the interleaved flyback circuit 401 for detecting the AC signal of the grid connection;
  • the obtaining module 404 can be respectively connected to the DC detecting module 402 and the AC detecting module 403 for acquiring the reference current at each time point according to the DC signal and the AC signal;
  • the quasi-resonant control circuit 405 can be coupled with the interleaved
  • the primary current sampling module 406 can be connected to the primary winding 4012 for sampling the current of the primary winding 4012; and the driving circuit 407 can be used for the switching transistor of the primary winding 4012.
  • the S M generates a drive signal that is turned on or off.
  • the comparator 408 in the driving circuit 407 can be respectively connected to the reference current obtaining module 404 and the primary current sampling module 406 for comparing whether the primary current is equal to the reference current, when the primary current is 'J, and the reference current is The output of the comparator 408 is 0. When the primary current reaches the reference current, the output of the comparator 408 is 1; and the flip-flop 409 can be respectively connected to the comparator 408, the quasi-resonant control circuit 405, and the switch of the primary winding 401 1 .
  • S M is connected to the tube, for, when the primary current equal to the reference current is increased, the driving switch S M is turned off, and when the secondary current sampling voltage drops to zero, the driving switch S M is turned on.
  • the reference current I ref is taken.
  • i c is the DC input voltage, which is the peak value of the AC output voltage
  • ⁇ is the peak value of the AC output current
  • ⁇ is the phase of the AC output voltage
  • 2 is The inductance of the secondary winding
  • t is the time in one cycle.
  • the following signals are obtained by the DC detection module 402: The DC input voltage V dc provided by the input voltage detection circuit.
  • the following is obtained by the AC signal detection module 403: phase ⁇ of the AC output voltage of the AC output voltage detection circuit provides an output voltage value V p, the output voltage detection circuit is provided, the output current value of the alternating output current detection circuit provided ⁇ .
  • the reference current value at each time point can be conveniently calculated ⁇
  • the driving circuit 407 of this embodiment may further include a diode 410 which are connected to the flip-flop 409 and the primary winding switch S M 401 1 for ensuring the flow of the forward drive signal is to avoid reverse flow of the signal Possible damage to the drive circuit 407.
  • the invention uses the reference current control flyback inverter for energy conversion, and ensures the calculation method of the reference current and the hardware control circuit in the two-stage topology of the interleaved parallel flyback circuit and the power frequency grid-connected inverter circuit.
  • the grid-connected current is a sinusoidal waveform with the same frequency as the grid voltage, which greatly reduces the total harmonic distortion of the grid-connected current and improves the output power quality.

Abstract

L'invention concerne un convertisseur à transfert indirect parallèle entrelacé pour système photovoltaïque solaire connecté au réseau, comprenant un circuit à transfert indirect parallèle entrelacé ; un module de détection de courant continu ; un module de détection de courant alternatif ; un module d'acquisition de courant de référence destiné à obtenir le courant de référence à chaque instant dans le temps ; un circuit de commande de quasi-résonance destiné à échantillonner la tension source/drain d'un tube de commutation et à déterminer si la tension source/drain est égale à une valeur de seuil de quasi-résonance ; un module d'échantillonnage de courant du côté primaire ; et un circuit d'attaque destiné à produire un signal d'attaque. Le circuit d'attaque comprend : un comparateur destiné à déterminer si le courant du côté primaire est égal au courant de référence ; et un déclencheur destiné à commander le tube de commutation pour le couper si le courant du côté primaire est égal au courant de référence et à commander le tube de commutation pour le rendre passant si la tension source/drain est égale à la valeur de seuil de quasi-résonance. L'invention concerne en outre un autre convertisseur à transfert indirect parallèle entrelacé pour système photovoltaïque solaire connecté au réseau. La présente invention utilise le courant de référence pour commander le convertisseur afin de convertir l'énergie, améliore le procédé de calcul du courant de référence dans une topologie de circuit à deux étages et garantit que le courant injecté sur le réseau présente une forme d'onde sinusoïdale de même phase et de même fréquence que le réseau électrique, ce qui réduit la THD du courant connecté au réseau et améliore la qualité du courant électrique produit.
PCT/CN2012/075866 2011-07-05 2012-05-22 Convertisseur à transfert indirect parallèle entrelacé pour système photovoltaïque solaire connecté au réseau WO2013004110A1 (fr)

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Application Number Priority Date Filing Date Title
CN2011101869839A CN102231609A (zh) 2011-07-05 2011-07-05 太阳能光伏并网交错并联反激逆变器
CN201110186983.9 2011-07-05

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GB2517585A (en) * 2013-07-15 2015-02-25 Univ Plymouth Control arrangement
JP2015139367A (ja) * 2014-01-23 2015-07-30 エルジー エレクトロニクス インコーポレイティド 電力変換装置、太陽光モジュール、通信装置及びそれを備える太陽光システム

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CN103501114B (zh) * 2013-09-17 2016-05-18 电子科技大学 具有临界导通模式的反激变换器
CN105141167B (zh) * 2014-12-05 2019-05-03 爱士惟新能源技术(扬中)有限公司 一种光伏逆变器交错移相的控制方法及光伏逆变器
CN117154834B (zh) * 2023-10-31 2024-02-06 安徽微伏特电源科技有限公司 一种光伏反激微型并网逆变器的控制方法

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GB2517585A (en) * 2013-07-15 2015-02-25 Univ Plymouth Control arrangement
GB2517585B (en) * 2013-07-15 2017-05-03 Univ Plymouth Control arrangement
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JP2015139367A (ja) * 2014-01-23 2015-07-30 エルジー エレクトロニクス インコーポレイティド 電力変換装置、太陽光モジュール、通信装置及びそれを備える太陽光システム
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