CN103972922B  The gridconnected control method adding Repetitive controller is controlled based on modified model quasiresonance  Google Patents
The gridconnected control method adding Repetitive controller is controlled based on modified model quasiresonance Download PDFInfo
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 CN103972922B CN103972922B CN201410137242.5A CN201410137242A CN103972922B CN 103972922 B CN103972922 B CN 103972922B CN 201410137242 A CN201410137242 A CN 201410137242A CN 103972922 B CN103972922 B CN 103972922B
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 Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE 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

 Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE 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
 Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
 Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses the gridconnected control method controlling to add Repetitive controller based on modified model quasiresonance.Using given gridconnected current and the actual input of difference as quasi resonant control, repetitive controller exporting gridconnected current of inverter, using the input of the difference of given zero direct current and actual gridconnected current as integral controller, the control signal of shutoff will be opened after the output of quasi resonant control, repetitive controller and integral controller three is added as converter bridge switching parts pipe in inversion link.This control method combines that resonance controls, the advantage of Repetitive controller and integral control, can effectively reduce line voltage, impact that frequency fluctuation produces, possesses good dynamic steady state tracking performance, contributes to the optimal design of cuttingin control.
Description
Technical field
The present invention relates to technical field of new energy power generation, particularly one adds the gridconnected mixing control method of Repetitive controller (RC) based on modified model quasiresonance control (QPRI).
Background technology
Along with the growth of photovoltaic generation installed capacity, the also network electric energy quality of industry to solar energy power generating proposes more and more higher requirement, studies highperformance, the development of high efficiency photovoltaic combining inverter to photovoltaic generation industry is significant.
In current engineering, the gridconnected current control method of Application comparison singlephase photovoltaic gridconnected inverter widely mainly contains proportional integral (PI) control, track with zero error, Repetitive controller and the control of ratio resonance etc.Proportional integral (PI) controls to be engineering is most widely used also ripe a kind of control method, and its method is simple, be easy to realize and have good dynamic property, but it can not realize the DAZ gene of offset of sinusoidal current reference signal; Track with zero error controls have better dynamic property and less phase place steadystate error than PI, but it is based upon on the basis of exact circuitry model, so its control effects is decided by the precision of modeling, and its error is larger when sample frequency is not high; Repetitive controller can eliminate during proportional integral (PI) controls the error periodically existed, and improves stable state control ability, but it is to the change of frequency is very sensitive and dynamic property is poor; Ratio resonance controls to control than PI and Repetitive controller has the steadystate behaviour of better DAZ gene and dynamic responding speed faster, but control effects its can by the impact of electrical network frequency fluctuation, when mains frequency occurs to offset, its control effects will obviously be deteriorated.
Find by prior art documents, Aproportional+multiresonantcontrollerforthreephasefourwirehighfrequencylinkinverter(D.DeandV.Ramanarayanan, " Aproportional+multiresonantcontrollerforthreephasefourwirehighfrequencylinkinverter, " IEEETrans.PowerElectron., vol.25, no.4, pp.899 – 906, Apr.2010.) a kind of control strategy based on ProportionalMultiresonant is proposed, this algorithm selectively can eliminate the harmonic wave of characteristic frequency, but the minor variations of discretization control and mains frequency can affect the control effects of this algorithm significantly.Proportionalresonantcontrollersandfiltersforgridconnec tedvoltagesourceconverters(R.Teodorescu, F.Blaabjerg, M.Liserre, andP.C.Loh, " Proportionalresonantcontrollersandfiltersforgridconnec tedvoltagesourceconverters " IEEProc.Electr.PowerAppl, vol.153, no.5, pp.750762, Sept.2006.) propose and ratio resonance controlled (PR) and to control the control strategy that (MRC) combine with multiresonant, its control effects is better than PR and PI and controls, but system can introduce huge amount of calculation when filtering highfrequency harmonic, reduce control rate.Photovoltaic generating system combining inverter control strategy research (Chen Ruirui, Chen Huiming, Wang Zhengshi. photovoltaic generating system combining inverter control strategy research [J]. electromechanical engineering, 2013,30 (5): 619622) a kind of innovatory algorithm based on the accurate ratio resonant controller of DSP numerically controlled segmentation PI+ is proposed, this algorithm can reach and reduce gridconnected current harmonic wave and reduce voltage ripple of power network to the effect of system interference, but its harmonic inhibition capability is strong not enough.HarmonicsSuppressionforSinglePhaseGridConnectedPVSyste msinDifferentOperationModes(YonghengYang, KeliangZhou, FredeBlaabjerg. " HarmonicsSuppressionforSinglePhaseGridConnectedPVSyste msinDifferentOperationModes, " 2013TwentyEighthAnnualIEEEAppliedPowerElectronicsConfer enceandExposition (APEC), 2013, pp, 889896.) propose based on resonance, repeat hybrid control strategy, it utilizes resonance to control the DAZ gene realized command signal, Repetitive controller is then with removing harmonic wave interference, this algorithm can efficiently filtering high order harmonic component disturb, but to 3th, 5th, the interference rejection capability of the loworder harmonics such as 7th is not strong.
For above deficiency, the present invention proposes one and controls to add Repetitive Control based on modified model quasiresonance, and this algorithm has better DAZ gene control performance, good Dynamic controlling effect, and this algorithm is easy to application and popularization in engineering.
Summary of the invention
The object of the invention is the deficiency existed to improve abovementioned control method, there is provided a kind of to take into account DAZ gene performance, Dynamic controlling effect and suppress the gridconnected control method controlling to add Repetitive controller based on modified model quasiresonance of electrical network interference performance, have directive significance to the design optimization of gridconnected control, concrete technical scheme is as follows.
Control based on modified model quasiresonance the gridconnected control method adding Repetitive controller, it comprises:
By given gridconnected current
with actual gridconnected current I
_{iNV}s the difference of () is as the input of quasi resonant control;
By given gridconnected current
with actual gridconnected current I
_{iNV}s the difference of () is as the input of repetitive controller;
By given zero direct current
with actual gridconnected current I
_{iNV}s the error of () is as the input of integral controller;
The control signal of shutoff will be opened after the output of quasi resonant control, repetitive controller and integral controller three is added as converter bridge switching parts pipe in inversion link.
Further, the transfer function of described quasi resonant control is:
Wherein: s is complex frequency domain operator, ω
_{g}for the angular frequency of line voltage, ω
_{c}for relevant to high gain region bandwidth angular frequency, K
_{p}with K
_{r}for quasiresonance control coefrficient.
Further, the transfer function of described repetitive controller is:
Wherein: z is transformation operator, N is carrier wave ratio, z
^{N}for cycle delay link, Q (z) z
^{N}for the coefficient of positive feedback link, the positive number of Q (z) for being less than 1, C (z) is compensator.
Further, the transfer function of described compensator C (z) is: C (z)=k
_{r}z
^{k}g
_{g}(z) S (z)
Wherein: k
_{r}for the gain of compensator, value is between 0 ~ 1; z
^{k}for phase place differentiation element, k is advanced umber of beats, G
_{g}z () is lowfrequency gain rectification link, S (z) is compensator filtering link.
Further, described integral controller transfer function is:
Wherein: s is complex frequency domain operator, K
_{i}for integral control coefficient.
Compared with prior art, tool of the present invention has the following advantages and technique effect: quasiresonance controls compared to resonance control strategy, many damping links, conventional resonance control mode can be kept in the high advantage of mains frequency place gain, the bandwidth of its high gain region can also be widened, make system still can realize good tracing control effect when fluctuation occurs mains frequency.Adding Repetitive controller makes controller have very strong static control performance, and steadystate error is close to zero.Integral controller controls to have good dynamic property to DC quantity, can strengthen system to lowfrequency harmonics rejection ability, improves the overall performance of control strategy.
Generally, the modified model quasiresonance proposed controls to add Repetitive controller and has stronger antiharmonic wave interference performance, good DAZ gene control performance and Dynamic controlling effect.
Accompanying drawing explanation
Fig. 1 is the control structure figure controlling to add Repetitive controller based on modified model quasiresonance.
Fig. 2 is the gridconnected Control system architecture figure controlling to add Repetitive controller based on modified model quasiresonance.
Fig. 3 is the photovoltaic inversion gridconnected current oscillogram controlling to add Repetitive controller based on modified model quasiresonance.
Fig. 4 is the fourier analysis figure controlling to add the photovoltaic inversion gridconnected current of Repetitive controller based on modified model quasiresonance.
Embodiment
Below in conjunction with accompanying drawing, the present invention is done and describes in detail further, but embodiments of the present invention are not limited thereto.
Fig. 1 is a kind of control structure figure controlling to add Repetitive controller based on modified model quasiresonance.
By given gridconnected current
with actual gridconnected current I
_{iNV}s the difference of () is as the input of quasi resonant control, the transfer function of quasi resonant control is:
wherein: s is complex frequency domain operator, ω
_{g}for the angular frequency of line voltage, ω
_{c}for relevant to high gain region bandwidth angular frequency, K
_{p}with K
_{r}for quasiresonance control coefrficient.
By given gridconnected current
with actual gridconnected current I
_{iNV}s the difference of () is as the input of repetitive controller, the transfer function of repetitive controller is:
wherein: z is transformation operator, N is carrier wave ratio, z
^{N}for cycle delay link, C (z) is compensator, and Q (z) is generally the constant being slightly less than 1, Q (z) z
^{N}for the coefficient of positive feedback link, it is equivalent to an integrator, carries out periodicity add up to error signal.Cycle delay link z
^{N}the error signal that membership makes to detect that adds just work when next cycle arrives, therefore can reduce the tracing control speed of system, make control system have larger hysteresis quality.
Compensator C (z) then plays the high frequency attenuation ability increasing control system openloop transfer function, improves the effect of system control performance.Compensator C (z) transfer function can be expressed as: C (z)=k
_{r}z
^{k}g
_{g}(z) S (z).Wherein k
_{r}for the gain of compensator, its size is directly proportional to convergence rate, is inversely proportional to the stability margin of system, and general value is between 0 ~ 1.Z
^{k}for phase place differentiation element, be used for the delayed phase of buckingout system, k is advanced umber of beats.G
_{g}z () is lowfrequency gain rectification link, be not the problem of 0dB for correcting lowfrequency gain.S (z) is compensator filtering link, is used for the rate of decay of raising system at high band, makes system in the gain of high band much smaller than 0, improves system to the rejection ability of Highfrequency Interference.
By given zero direct current
with actual gridconnected current I
_{iNV}s the error of () is as the input of integral controller, integral controller transfer function is:
wherein: s is complex frequency domain operator, K
_{i}for integral control coefficient;
The control signal of shutoff will be opened after the output of quasi resonant control, repetitive controller and integral controller three is added as converter bridge switching parts pipe in inversion link.
Fig. 2 is the gridconnected Control system architecture figure controlling to add Repetitive controller based on modified model quasiresonance.
In figure, u
_{dc}for major loop DC voltage, electric capacity C plays pressure stabilization function.Direct current changes into alternating current through fullbridge inverter and is connected to main electrical network by L filter again.Control loop adopts band line voltage V
_{g}s modified model quasiresonance that () is feedovered controls to add Repetitive Control.SPWM is Sine Modulated, produces train pulse control fullbridge inverter switching tube and opens and shutoff.
Following parameter is adopted to carry out simulation analysis to system:
Major loop DC voltage u
_{dc}=400V, AC L filter inductance is 5mH, represents line impedance with resistance R, value 0.1 Ω.Modified model quasi resonant control parameter: ω
_{g}=314rad/sec, K
_{p}=20, K
_{r}=400, ω
_{c}=3.14, K
_{i}=100.
Repetitive controller parameter: Q (z)=0.96, N=400, k
_{r}=1, k=20,
The carrier frequency f=19.2kHz of SPWM Sine Modulated.
Fig. 3 is the photovoltaic inversion gridconnected current waveform controlling to add Repetitive controller based on modified model quasiresonance.Fig. 4 is the fourier analysis controlling to add the photovoltaic inversion gridconnected current of Repetitive controller based on modified model quasiresonance, after controlling to add Repetitive Control, is only 1.61% by employing known in figure based on modified model quasiresonance.
Claims (3)
1. control based on modified model quasiresonance the gridconnected control method adding Repetitive controller, it is characterized in that, comprising:
By given gridconnected current
with actual gridconnected current I
_{iNV}s the difference of () is as the input of quasi resonant control;
By given gridconnected current
with actual gridconnected current I
_{iNV}s the difference of () is as the input of repetitive controller;
By given zero direct current
with actual gridconnected current I
_{iNV}s the error of () is as the input of integral controller;
The control signal of shutoff will be opened after the output of quasi resonant control, repetitive controller and integral controller three is added as converter bridge switching parts pipe in inversion link;
The transfer function of repetitive controller is:
${G}_{RC}\left(z\right)=\frac{1}{1Q\left(z\right){z}^{N}}\·{z}^{N}\·C\left(z\right)$
Wherein: z is transformation operator, N is carrier wave ratio, z
^{N}for cycle delay link, Q (z) z
^{N}for the coefficient of positive feedback link, the positive number of Q (z) for being less than 1, C (z) is compensator;
The transfer function of compensator C (z) is: C (z)=k
_{r}z
^{k}g
_{g}(z) S (z)
Wherein: k
_{r}for the gain of compensator, value is between 0 ~ 1; z
^{k}for phase place differentiation element, k is advanced umber of beats, G
_{g}z () is lowfrequency gain rectification link, S (z) is compensator filtering link.
2. the gridconnected control method adding Repetitive controller based on the control of modified model quasiresonance according to claim 1, is characterized in that:
The transfer function of quasi resonant control is:
${G}_{QPR}\left(s\right)={K}_{P}+\frac{2{K}_{R}{\mathrm{\ω}}_{c}s}{{s}^{2}+2{\mathrm{\ω}}_{c}s+{\mathrm{\ω}}_{g}^{2}}$
Wherein: s is complex frequency domain operator, ω
_{g}for the angular frequency of line voltage, ω
_{c}for relevant to high gain region bandwidth angular frequency, K
_{p}with K
_{r}for quasiresonance control coefrficient.
3. the gridconnected control method adding Repetitive controller based on the control of modified model quasiresonance according to claim 1, is characterized in that:
Integral controller transfer function is:
Wherein: s is complex frequency domain operator, K
_{i}for integral control coefficient.
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CN104836232B (en) *  20150514  20170201  电子科技大学  Frequency widerange selfadaptive repetition control method of active power filter 
CN105471276A (en) *  20151224  20160406  哈尔滨同为电气股份有限公司  ACAC converter control method suitable for suppressing alternatingcurrent input harmonic 
CN107919668B (en) *  20171106  20201204  许继电源有限公司  Active power filter and control method thereof 
CN108712095A (en) *  20180531  20181026  东南大学  Control method of gridconnected inverter based on the control of improved ratio quasiresonance 
CN110138253A (en) *  20190628  20190816  盐城正邦环保科技有限公司  A kind of photovoltaic combining inverter control method that multiresonant PR and PI jointly controls 
CN112054560A (en) *  20200925  20201208  东莞市钜大电子有限公司  Photovoltaic gridconnected method based on quasiproportional resonance and repetitive control 
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