CN104362675A - Inverter system and photovoltaic grid inverter control method and device - Google Patents

Inverter system and photovoltaic grid inverter control method and device Download PDF

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CN104362675A
CN104362675A CN201410602671.5A CN201410602671A CN104362675A CN 104362675 A CN104362675 A CN 104362675A CN 201410602671 A CN201410602671 A CN 201410602671A CN 104362675 A CN104362675 A CN 104362675A
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inverter
dcm
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described inverter
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CN104362675B (en
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王久和
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Beijing Information Science and Technology University
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    • H02J3/383—
    • 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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention relates to the field of power electronic technology and nonlinear control application and discloses an inverter system and a photovoltaic grid inverter control method and device. Maximum power point voltage Udcm and maximum power point current idcm on the alternating-current side of the inverter are acquired by acquiring three-phase line voltage ueab, uebc and ueca and three-phase current ia, ib and ic on the alternating-current side of the inverter, and the inverter is controlled according to an inverter controller established on the basis of an EL equation model under the condition of unbalanced power grid. Alternating-current harmonic of the photovoltaic grid inverter power grid is reduced under the condition of the unbalanced power grid, dynamic decoupling of current is realized, and stable state and dynamic performance of the inverter are improved.

Description

Photovoltaic combining inverter control method, device and inverter system
Technical field
The present invention relates to power electronic technology and nonlinear Control application, particularly relate to a kind of photovoltaic combining inverter control method, device and inverter system.
Background technology
Along with the development of Application of Solar Energy technology, the mainstream development trend of photovoltaic generating system will be grid-connected photovoltaic power generation undoubtedly.And as the combining inverter of one of grid-connected photovoltaic system key device, its runnability then directly affects the safe, reliable of grid-connected photovoltaic system and high-efficiency operation.In general, in residents, small-power grid-connected photovoltaic system, its synchronization inverter main circuit often adopts single-phase topological structure, with the single-phase electrical network of adaptation; And for concentrated high-power photovoltaic synchronization electricity generation system, its synchronization inverter main circuit often adopts three-phase topological structure, with adaptive three phase network.For three-phase operation environment, the imbalance of its three phase network is unavoidable, and the three-phase grid-connected inverter Control System Design of routine, generally all ignore the imbalance of three phase network, even three phase network is unbalanced.But, according to the three-phase grid-connected inverter designed by three-phase equilibrium grid conditions, once three phase network is uneven, then owing to producing uncharacteristic harmonics, thus make combining inverter current on line side produce distortion, this will cause, and combining inverter runnability declines, loss increases, and combining inverter can be made to break down, even burn power model wherein time serious.Therefore, the combining inverter control strategy under the uneven condition of research three phase network, for the safe, reliable of the concentrated high-power photovoltaic synchronization electricity generation system under three-phase operation environment and high-efficiency operation, has important realistic meaning undoubtedly.
Summary of the invention
The invention provides a kind of photovoltaic combining inverter control method, device and inverter system, solve existing wireless charging electromagnetic frequency and fix, make the technical problem that single charging device only can charge to the equipment of same type.
The object of the invention is to be achieved through the following technical solutions:
A kind of photovoltaic combining inverter control method, comprising:
Obtain the three-phase line voltage u of inverter ac side eab, u ebc, u ecawith three-phase current i a, i b, i c;
Obtain inverter direct-flow side maximum power point voltage U dcmwith maximum power point current i dcm;
According to the inverter controller set up based on EL equation model, in unbalanced power supply situation, described inverter is controlled, wherein, the model of described inverter is the Mathematical Modeling under three-phase static coordinate system, described inverter controller is the Passive Shape Control device based on EL equation model, described inverter controller be input as u eab, u ebc, u eca, i a, i b, i c, U dcmand i dcm, the output of described inverter controller is the switch function S under three-phase static coordinate system a, S b, S c.
A kind of photovoltaic combining inverter control device, comprising:
First acquisition module, for obtaining the three-phase line voltage u of inverter ac side eab, u ebc, u ecawith three-phase current i a, i b, i c;
Second acquisition module, for obtaining inverter direct-flow side maximum power point voltage U dcmwith maximum power point current i dcm;
Control module, for the inverter controller that basis is set up based on EL equation model, in unbalanced power supply situation, described inverter is controlled, wherein, the model of described inverter is the Mathematical Modeling under three-phase static coordinate system, and described inverter controller is the Passive Shape Control device based on EL equation model, described inverter controller be input as u eab, u ebc, u eca, i a, i b, i c, U dcmand i dcm, the output of described inverter controller is the switch function S under three-phase static coordinate system a, S b, S c.
A kind of photovoltaic synchronization inverter system, comprise photovoltaic array, inverter and inverter controller, wherein, described inverter controller, for obtaining the three-phase line voltage u of inverter ac side eab, u ebc, u ecawith three-phase current i a, i b, i c; Obtain inverter direct-flow side maximum power point voltage U dcmwith maximum power point current i dcm; According to the inverter controller set up based on EL equation model, in unbalanced power supply situation, described inverter is controlled, wherein, the model of described inverter is the Mathematical Modeling under three-phase static coordinate system, described inverter controller is the Passive Shape Control device based on EL equation model, described inverter controller be input as u eab, u ebc, u eca, i a, i b, i c, U dcmand i dcm, the output of described inverter controller is the switch function S under three-phase static coordinate system a, S b, S c.
By a kind of photovoltaic combining inverter control method provided by the invention, device and inverter system, by obtaining the three-phase line voltage u of inverter ac side eab, u ebc, u ecawith three-phase current i a, i b, i c, obtain inverter direct-flow side maximum power point voltage U dcmwith maximum power point current i dcm, according to the inverter controller set up based on EL equation model, in unbalanced power supply situation, described inverter is controlled.Reduce the alternating current harmonic wave that photovoltaic combining inverter is connected to the grid when unbalanced power supply, and achieve the dynamic decoupling of electric current, improve stable state and the dynamic property of inverter.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, also can obtain other accompanying drawing according to these accompanying drawings.
The application scenarios figure of a kind of photovoltaic combining inverter control method that Fig. 1 provides for the embodiment of the present invention;
The structural representation of the L-type filter three-phase photovoltaic grid-connected inverting device that Fig. 2 provides for the embodiment of the present invention;
The flow chart of a kind of photovoltaic combining inverter control method that Fig. 3 provides for the embodiment of the present invention;
The Establishing process figure of the inverter controller that Fig. 4 provides for the embodiment of the present invention;
The unbalanced source voltage compensation principle schematic diagram that Fig. 5 provides for the embodiment of the present invention;
The structural representation of a kind of photovoltaic combining inverter control device that Fig. 6 provides for the embodiment of the present invention;
A kind of photovoltaic combining inverter structural representation that Fig. 7 provides for the embodiment of the present invention;
A kind of photovoltaic synchronization inverter system structural representation that Fig. 8 provides for the embodiment of the present invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
A kind of application scenarios figure of photovoltaic combining inverter control method is provided in the embodiment of the present invention, as shown in Figure 1, photovoltaic array 110 is converted to alternating current by inverter 120 and is connected to the grid 130, inverter 120 is controlled by inverter controller 130, in practical application, inverter 120 and inverter controller 130 can being integrated equipment, also can be specific installations.Structure for inverter 120 illustrates with L-type filter three-phase photovoltaic grid-connected inverting device, as shown in Figure 2, for the structural representation of L-type filter three-phase photovoltaic grid-connected inverting device, the Mathematical Modeling of this three-phase photovoltaic grid-connected inverting device under three-phase abc coordinate system, can represent by formula (1).
3 L di a dt = ( S ab - S ca ) U dcm - 3 Ri a - ( u ea - u ec ) 3 L di b dt = ( S bc - S ab ) U dcm - 3 Ri b - ( u eb - u ea ) 3 L di c dt = ( S ca - S bc ) U dcm - 3 Ri c - ( u ec - u eb ) - - - ( 1 )
Wherein, Sa, Sb, Sc are switch function, the S when upper brachium pontis conducting k(k=a, b, c)=1, S during brachium pontis conducting instantly k(k=a, b, c)=0, S ab, S bc, S cafor wiretap function, S ab=S a-S b, S bc=S b-S c, S ca=S c-S a, the S when upper brachium pontis conducting k(k=a, b, c)=1, S during brachium pontis conducting instantly k(k=a, b, c)=0; u eab, u ebc, u ecafor grid line voltage; U dcmfor maximum power point of photovoltaic array voltage.
Based on the application scenarios shown in Fig. 1, for inverter controller 130, introduce a kind of photovoltaic combining inverter control method provided in the embodiment of the present invention, as shown in Figure 3, the method comprises the steps:
Step 301, the three-phase line voltage obtaining inverter ac side and three-phase current;
Wherein, voltage sensor can be utilized to obtain the three-phase line voltage u of inverter ac side eab, u ebc, u eca, utilize current sensor to obtain three-phase current i a, i b, i c;
Step 302, acquisition inverter direct-flow side maximum power point voltage and maximum power point electric current;
Wherein, maximum power point voltage U can be obtained by the MPPT maximum power point tracking MPPT of photovoltaic system dcmwith maximum power point current i dcm.
The inverter controller that step 303, basis are set up based on EL equation model, in unbalanced power supply situation, controls described inverter.
Wherein, the model of described inverter is the Mathematical Modeling under three-phase static coordinate system, and described inverter controller is the Passive Shape Control device based on EL equation model, described inverter controller be input as u eab, u ebc, u eca, i a, i b, i c, U dcmand i dcm, the output of described inverter controller is the switch function S under three-phase static coordinate system a, S b, S c.
Embodiments provide a kind of photovoltaic combining inverter control method, by a kind of photovoltaic combining inverter control method provided by the invention, device and inverter system, by obtaining the three-phase line voltage u of inverter ac side eab, u ebc, u ecawith three-phase current i a, i b, i c, obtain inverter direct-flow side maximum power point voltage U dcmwith maximum power point current i dcm, according to the inverter controller set up based on EL equation model, in unbalanced power supply situation, described inverter is controlled.Reduce the alternating current harmonic wave that photovoltaic combining inverter is connected to the grid when unbalanced power supply, and achieve the dynamic decoupling of electric current, improve stable state and the dynamic property of inverter.
Before the step 301 of the embodiment of the present invention, need to set up inverter controller in advance, below to the process of establishing of inverter controller, describe in detail, be illustrated in figure 4 the Establishing process figure of inverter controller, comprise the steps:
Step 401, triple line current i to described inverter ac side a, i b, i ccarry out Park conversion, to obtain the ac-side current i under two-phase synchronous rotating frame d, i q;
Wherein, according to matrix formula (2), to i a, i b, i ccarry out Park conversion, to obtain the ac-side current i under two-phase synchronous rotating frame d, i q,
Step 402, to the wiretap function S of described inverter under three-phase static coordinate system ab, S bc, S cacarry out Park conversion, to obtain the switch function S under two-phase synchronous rotating frame ld, S lq;
Wherein, according to matrix formula (3), carries out Park conversion to switch function Sab, Sbc, Sca, to obtain the switch function S under two-phase synchronous rotating frame ld, S lq.
Step 403, three-phase line voltage u to described inverter ac side eab, u ebc, u ecaconvert, to obtain the AC voltage u under two-phase synchronous rotating frame led, u leq;
Wherein, according to Matrix Formula (3), to u eab, u ebc, u ecacarry out Park conversion, to obtain the AC voltage u under two-phase synchronous rotating frame led, u leq.
Wherein, sequencing is not had between step 401-403.
Step 404, by i d, i q, u led, u leq, S ld, S lqsubstitute into the Mathematical Modeling of described inverter under three-phase static coordinate system, to obtain the Mathematical Modeling of described inverter under two-phase synchronous rotating frame;
Wherein, by i d, i q, u led, u leq, S ld, S lqsubstitute in formula (1), obtain the Mathematical Modeling of described inverter under two-phase synchronous rotating frame L di d dt = 3 3 S d u dcm - Ri d + ωLi q - 3 3 u led L di q dt = 3 3 S q u dcm - Ri q - ωLi d - 3 3 u leq (4), in formula (4), i d, i qfor the component of alternating current on d, q axle; S ld, S lqfor the component of wiretap function on d, q axle; u led, u leqfor the component of grid line voltage on d, q axle.
Step 405, according to EL equation model and described inverter inverter controller described in the Mathematical Models under two-phase synchronous rotating frame.
Wherein, step 405 is in order to obtain based on EL equation (Euler-Lagrange, Euler-Lagrange equation) inverter Passive Shape Control strategy, need according to EL equation model and described inverter the Mathematical Models inverter controller under two-phase synchronous rotating frame, specifically comprise the steps:
Step 405-1, be EL equation model by the Transformation of Mathematical Model of described inverter under two-phase synchronous rotating frame;
Wherein, formula (4) is transformed into EL model (5), in formula (5) represent that x is to the derivative of time, x = x 1 x 2 = i d i q , M = L 0 0 L , J = 0 - ωL ωL 0 , R = R 0 0 R , u = 3 3 S ld U dc - 3 3 u led 3 3 S lq U dc - 3 3 u leq .
Step 405-2, in EL equation model, inject damping, to obtain the control law of described inverter controller;
Wherein, if photovoltaic combining inverter expects that current phasor is x r, error current vector x e=x r-x.Formula (5) becomes M x · e + Jx e + Rx e = - u + M x · r + Jx r + Rx r Formula (6), error energy function is passive Shape Control utensil based on EL equation has good steady-state behaviour, but convergence rate is comparatively slow, for accelerating system convergence speed, injecting damping in the controller, making the quick vanishing of error energy function, adopts damping to inject R dx e=(R+R a) x e, R afor matrix is injected in damping, R a = R a 1 0 0 R a 2 , R a1, R a2for the damping of injecting, when introducing damping and injecting matrix, formula (6) becomes M x · e = - u + M x · r + Jx + Rx r + R a x e - R d x e , Energy error function is got and leads H · e ( x ) = x e T M x · e , H · e ( x ) = x e T ( - u + M x · r + Jx + Rx r + R a x e - R d x e ) , The control rate of controller is made to be formula (7), the then derivative of energy error function against time make H e(x) → 0, x → x r, under formula (7) effect, photovoltaic combining inverter can realize control objectives, regulates R awith regard to adjustable H e(x) converge to 0 speed.The wiretap function of control objectives can be realized by formula (7) S ld = ( 3 L i · dr - 3 ωLi q + 3 Ri dr + 3 R a 1 ( i dr - i d ) + 3 u led ) / 3 U dcm , S lq = ( 3 L i · qr + 3 ωLi d + 3 Ri qr + 3 R a 2 ( i qr - i q ) + 3 u leq ) / 3 U dcm Formula (8), R a1, R a2for the damping of injecting, i dr, i qr is i d, i qdesired value.During for unbalanced power supply, require that photovoltaic combining inverter exports the three-phase equilibrium simple sinusoidal alternating current synchronous with line voltage, require i drbe the steady state value of a non-zero, i qrbe zero.If ignore switching losses, consider by normal equilibrium electrical network amount voltage, can obtain according to alternating current-direct current side power-balance
i dr = I m = - U m 2 R + ( U m 2 R ) 2 + 2 U dcm i dcm 3 R - - - ( 9 )
In formula, i dcmfor maximum power point of photovoltaic array electric current, Um is DC voltage.
In order to verify the dynamic decoupling to electric current, this wiretap function being substituted into formula (4), can obtain L R + R a 1 d ( i dr - i d ) dt + ( i dr - i d ) = 0 L R + R a 2 d ( i qr - i q ) dt + ( i qr - i q ) = 0 , Inverter controller in the visible embodiment of the present invention not only can realize control objectives, also can realize electric current dynamic decoupling, as long as R a1, R a2be transferred to suitable value, stable state and the dynamic property of photovoltaic combining inverter can be improved.
Step 405-3, control law according to described inverter controller, set up inverter controller.
Wherein, the output of described inverter controller is switch function S a, S b, S c, S a = 1 3 ( S ab - S ca + ΔS ) S b = 1 3 ( S bc - S ab + ΔS ) S c = 1 3 ( S ca - S bc + ΔS ) Formula (10), Δ S=S a+ S b+ S c, wherein, first pass through S ldand S lqcarry out the inverse transformation of dq0 to abc, obtain the wiretap function S under three-phase static coordinate system ab, S bc, S ca, S ab=S ldsin (ω t+30 °)+S lqcos (ω t+30 °), S bc=S ldsin (ω t-90 °)+S lqcos (ω t-90 °), S ca=S ldsin (ω t+150 °)+S lqcos (ω t+150 °), S abby S ldand S lqcarry out the inverse transformation of dq0 to abc and obtain, formula (10) being updated in formula (1), 3 L di a dt = 3 S a U dcm - 3 Ri a - 3 u ea - ΔSU dcm + Δu 3 L di b dt = 3 S b U dcm - 3 Ri b - 3 u eb - ΔSU dcm + Δu 3 L di c dt = 3 S c U dcm - 3 Ri c - 3 u ec - ΔSU dcm + Δu Formula (11), in formula, Δ u=u ea+ u eb+ u ec.
For overcoming the impact of Δ u on alternating current, according to formula (10), can select then have S a = 1 3 ( S ab - S ca + Δu U dcm ) S b = 1 3 ( S bc - S ab + Δu U dcm ) S c = 1 3 ( S ca - S bc + Δu U dcm ) Formula (12).
The pwm signal obtained by formula (12) can realize when unbalanced power supply, and AC network side filter both end voltage is sinusoidal, i.e. line voltage u ea, u eb, u ectime uneven, photovoltaic combining inverter output voltage u a, u b, u cjust uneven, namely use the unbalanced output voltage compensation unbalanced source voltage of inverter, its compensation principle as shown in Figure 5.
Embodiments provide a kind of photovoltaic combining inverter control device, as shown in Figure 6, comprising:
First acquisition module 610, for obtaining the three-phase line voltage u of inverter ac side eab, u ebc, u ecawith three-phase current i a, i b, i c;
Second acquisition module 620, for obtaining inverter direct-flow side maximum power point voltage U dcmwith maximum power point current i dcm;
Control module 630, for the inverter controller that basis is set up based on EL equation model, in unbalanced power supply situation, described inverter is controlled, wherein, the model of described inverter is the Mathematical Modeling under three-phase static coordinate system, and described inverter controller is the Passive Shape Control device based on EL equation model, described inverter controller be input as u eab, u ebc, u eca, i a, i b, i c, U dcmand i dcm, the output of described inverter controller is the switch function S under three-phase static coordinate system a, S b, S c.
Wherein, described control module 630, comprising:
First converter unit 631, for the triple line current i of the inverter ac side by described first acquisition module acquisition a, i b, i cbe transformed to the ac-side current i under two-phase synchronous rotating frame d, i q;
Second converter unit 632, for the three-phase line voltage u of the inverter ac side by described first acquisition module acquisition eab, u ebc, u ecabe transformed to the AC voltage u under two-phase synchronous rotating frame led, u leq;
Damping input unit 633, for inputting damping R a1, R a2;
Current calculation unit 534, for according to maximum power point voltage U dcmwith maximum power point current i dcm, calculate i d, i qdesired value i dr, i qr;
Processing and control element (PCE) 635, for according to i d, i q, u led, u leq, R a1, R a2, U dcm, i dr, i qr, calculate wiretap function Sab, Sbc, Sca, according to described wiretap function Sab, Sbc, Sca, calculate switch function Sa, Sb, Sc, and by described switch function Sa, Sb, Sc, in unbalanced power supply situation, described inverter is controlled.
Further, described processing and control element (PCE) 635, comprising:
Computation subunit 6351, for according to i d, i q, u led, u leq, R a1, R a2, U dcm, i dr, i qr, calculate the switch function under two-phase synchronous rotating frame S ld = ( 3 L i · dr - 3 ωLi q + 3 Ri dr + 3 R a 1 ( i dr - i d ) + 3 u led ) / 3 U dcm , S lq = ( 3 L i · qr + 3 ωLi d + 3 Ri qr + 3 R a 2 ( i qr - i q ) + 3 u leq ) / 3 U dcm ;
Control to export subelement 6352, for S ldand S lqcarry out Park inverse transformation, to obtain the wiretap function S under three-phase static coordinate system ab, S bc, S ca;
Control to perform subelement 6353, for according to wiretap function, calculate switch function S a, S b, S c, and by described switch function S a, S b, S c, in unbalanced power supply situation, described inverter is controlled.
Embodiments provide a kind of photovoltaic combining inverter structure, according to formula (2), (3), (9), (8) and (10) can obtain unbalanced power supply time photovoltaic combining inverter structure, as shown in Figure 7, wherein, the three-phase line voltage u being input as AC of control section eab, u ebc, u eca, three-phase current i a, i b, i c, inverter direct-flow side maximum power point voltage U dcmwith maximum power point current i dcm; Export as switch function S a, S b, S c, pass through S a, S b, S cimplementation space Vector Pulse Width Modulation SVPWM (Space Vector Pulse Width Modulation).
The embodiment of the present invention additionally provides a kind of photovoltaic synchronization inverter system, as shown in Figure 8, comprises photovoltaic array 810, inverter 820 and inverter controller 830, and wherein, described inverter controller 830, for obtaining the three-phase line voltage u of inverter ac side eab, u ebc, u ecawith three-phase current i a, i b, i c; Obtain inverter direct-flow side maximum power point voltage U dcmwith maximum power point current i dcm; According to the inverter controller set up based on EL equation model, in unbalanced power supply situation, described inverter is controlled, wherein, the model of described inverter is the Mathematical Modeling under three-phase static coordinate system, described inverter controller is the Passive Shape Control device based on EL equation model, described inverter controller be input as u eab, u ebc, u eca, i a, i b, i c, U dcmand i dcm, the output of described inverter controller is the switch function S under three-phase static coordinate system a, S b, S c.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required hardware platform by software and realize, can certainly all be implemented by hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, what technical scheme of the present invention contributed to background technology can embody with the form of software product in whole or in part, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.
Above to invention has been detailed introduction, applying specific case herein and setting forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (7)

1. a photovoltaic combining inverter control method, is characterized in that, comprising:
Obtain the three-phase line voltage u of inverter ac side eab, u ebc, u ecawith three-phase current i a, i b, i c;
Obtain inverter direct-flow side maximum power point voltage U dcmwith maximum power point current i dcm;
According to the inverter controller set up based on EL equation model, in unbalanced power supply situation, described inverter is controlled, wherein, the model of described inverter is the Mathematical Modeling under three-phase static coordinate system, described inverter controller is the Passive Shape Control device based on EL equation model, described inverter controller be input as u eab, u ebc, u eca, i a, i b, i c, U dcmand i dcm, the output of described inverter controller is the switch function S under three-phase static coordinate system a, S b, S c.
2. method according to claim 1, is characterized in that, according to the inverter controller set up based on EL equation model, comprising:
To the triple line current i of described inverter ac side a, i b, i ccarry out Park conversion, to obtain the ac-side current i under two-phase synchronous rotating frame d, i q;
To the wiretap function S of described inverter under three-phase static coordinate system ab, S bc, S cacarry out Park conversion, to obtain the wiretap function S under two-phase synchronous rotating frame ld, S lq;
To the three-phase line voltage u of described inverter ac side eab, u ebc, u ecaconvert, to obtain the AC voltage u under two-phase synchronous rotating frame led, u leq;
By i d, i q, u led, u leq, S ld, S lqsubstitute into the Mathematical Modeling of described inverter under three-phase static coordinate system, to obtain the Mathematical Modeling of described inverter under two-phase synchronous rotating frame;
The inverter controller described in the Mathematical Models under two-phase synchronous rotating frame according to EL equation model and described inverter.
3. method according to claim 2, is characterized in that, described according to EL equation model and described inverter inverter controller described in the Mathematical Models under two-phase synchronous rotating frame, comprising:
Be EL equation model by the Transformation of Mathematical Model of described inverter under two-phase synchronous rotating frame;
Damping is injected, to obtain the control law of described inverter controller in EL equation model;
According to the control law of described inverter controller, set up inverter controller, the output of described inverter controller
S a＝(1/3)*(S ab-S ca+ΔS)、
S b＝(1/3)*(S bc-S ab+ΔS)、
S c＝(1/3)*(S ca-S bc+ΔS)，ΔS＝S a+S b+S c，
Wherein,
S ab＝S ldsin(ωt+30°)+S lqcos(ωt+30°)，
S bc＝S ldsin(ωt-90°)+S lqcos(ωt-90°)，
S ca＝S ldsin(ωt+150°)+S lqcos(ωt+150°)，
S ld = ( 3 L i · dr - 3 ωLi q + 3 Ri dr + 3 R al ( i dr - i d ) + 3 u ed ) / 3 U dcm ,
S lq = ( 3 L i · qr - 3 ωLi d + 3 Ri qr + 3 R a 2 ( i qr - i q ) + 3 u eq ) / 3 U dcm , R a1, R a2for the damping of injecting, i dr, i qrfor i d, i qdesired value.
4. a photovoltaic combining inverter control device, is characterized in that, comprising:
First acquisition module, for obtaining the three-phase line voltage u of inverter ac side eab, u ebc, u ecawith three-phase current i a, i b, i c;
Second acquisition module, for obtaining inverter direct-flow side maximum power point voltage U dcmwith maximum power point current i dcm;
Control module, for the inverter controller that basis is set up based on EL equation model, in unbalanced power supply situation, described inverter is controlled, wherein, the model of described inverter is the Mathematical Modeling under three-phase static coordinate system, and described inverter controller is the Passive Shape Control device based on EL equation model, described inverter controller be input as u eab, u ebc, u eca, i a, i b, i c, U dcmand i dcm, the output of described inverter controller is the switch function S under three-phase static coordinate system a, S b, S c.
5. device according to claim 4, is characterized in that, described control module, comprising:
First converter unit, for the triple line current i of the inverter ac side by described first acquisition module acquisition a, i b, i cbe transformed to the ac-side current i under two-phase synchronous rotating frame d, i q;
Second converter unit, for the three-phase line voltage u of the inverter ac side by described first acquisition module acquisition eab, u ebc, u ecabe transformed to the AC voltage u under two-phase synchronous rotating frame led, u leq;
Damping input unit, for inputting damping R a1, R a2;
Current calculation unit, for according to maximum power point voltage U dcmwith maximum power point current i dcm, calculate i d, i qdesired value i dr, i qr;
Processing and control element (PCE), for according to i d, i q, u led, u leq, R a1, R a2, U dcm, i dr, i qr, calculate wiretap function Sab, Sbc, Sca, according to described wiretap function Sab, Sbc, Sca, calculate switch function Sa, Sb, Sc, and by described switch function S a, S b, S c, in unbalanced power supply situation, described inverter is controlled.
6. device according to claim 5, is characterized in that, described processing and control element (PCE), comprising:
Computation subunit, for according to i d, i q, u led, u leq, R a1, R a2, U dcm, i dr, i qr, calculate the wiretap function under two-phase synchronous rotating frame S ld = ( 3 L i · dr - 3 ωLi q + 3 Ri dr + 3 R al ( i dr - i d ) + 3 u ed ) / 3 U dcm , S ld = ( 3 L i · qr + 3 ωLi d + 3 Ri qr + 3 R a 2 ( i qr - i q ) + 3 u eq ) / 3 U dcm ;
Control to export subelement, for S ldand S lqcarry out Park inverse transformation, to obtain the wiretap function S under three-phase static coordinate system ab, S bc, S ca;
Control to perform subelement, for according to wiretap function S ab, S bc, S ca, calculate switch function S a, S b, S c, and by described switch function S a, S b, S c, in unbalanced power supply situation, described inverter is controlled.
7. a photovoltaic synchronization inverter system, is characterized in that, comprises photovoltaic array, inverter and inverter controller, and wherein, described inverter controller, for obtaining the three-phase line voltage u of inverter ac side eab, u ebc, u ecawith three-phase current i a, i b, i c; Obtain inverter direct-flow side maximum power point voltage U dcmwith maximum power point current i dcm; According to the inverter controller set up based on EL equation model, in unbalanced power supply situation, described inverter is controlled, wherein, the model of described inverter is the Mathematical Modeling under three-phase static coordinate system, described inverter controller is the Passive Shape Control device based on EL equation model, described inverter controller be input as u eab, u ebc, u eca, i a, i b, i c, U dcmand i dcm, the output of described inverter controller is switch function Sa, Sb, Sc under three-phase static coordinate system.
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