CN106229971A - Outside centralized distributed photovoltaic power generation cluster resonance inhibiting system and suppressing method - Google Patents
Outside centralized distributed photovoltaic power generation cluster resonance inhibiting system and suppressing method Download PDFInfo
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Classifications
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- 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
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- H02J3/383—
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- 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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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- 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
A kind of outside centralized distributed photovoltaic power generation cluster resonance inhibiting system and suppressing method, it is distributed photovoltaic power generation cluster and inverter is incorporated to power distribution network commonly through distribution network line, inverter connects central control unit, central control unit is by DC voltage controller, current controller and resonant controller are constituted, the signal output part of current controller connects the input of inverter, the input of current controller connects DC voltage controller and the signal output part of resonant controller and the actual output current of inverter respectively, the signal input part of DC voltage controller connects Converter DC-side capacitance voltage reference value U respectivelydcrefWith Converter DC-side electric capacity actual voltage value Udc, the signal input part of resonant controller connects distribution network line virtual voltage Upcc.Instant invention overcomes photovoltaic cluster and access the adverse effect that traditional PR controller steady-state error and robust performance are brought.Simple and direct it is easily achieved, to active distribution network operating condition strong adaptability.
Description
Technical field
The present invention relates to a kind of photovoltaic generation cluster resonance suppressing method.Particularly relate to one outside centralized distributed
Photovoltaic generation cluster resonance inhibiting system and suppressing method.
Background technology
In recent years, China's distributed photovoltaic presents to be developed in flakes, the feature that cluster is grid-connected.The undulatory property of photovoltaic generation,
Intermittent, the feature of randomness so that the output of photovoltaic group system comprises the voltage x current of abundant harmonic spectrum.Meanwhile,
Distributed photovoltaic power generation group system exists substantial amounts of LCL filter, constitutes complicated high-order electric network with distribution impedance, make
There is substantial amounts of natural resonance point in photovoltaic group system.Therefore, when distributed power generation cluster networking system voltage current harmonics frequency
When rate and this system natural resonance dot frequency match, resonance will occur.Resonance problems will affect the control loop of inverter, draw
Play the problems such as grid-connected photovoltaic system unstability, in the current grid-connected engineering of existing distributed photovoltaic, occur in that a lot of inversion
Device parallel running produces resonance and causes grid-connected failure even to damage the case of grid-connection device, it is therefore necessary to study suitable scheme
The resonance problems of suppression photovoltaic cluster grid-connected system.
The main method using the active dampings such as virtual impedance of suppression of inverter parallel resonance, by increasing system damping
System resonance peak is suppressed.But, above-mentioned active damping method focuses on the resonance suppression from single inverter, and real
In border, inverter is often parallel running, between inverter and inverter, there is the humorous of complexity between inverter and electrical network
Shake coupled relation.These active damping algorithms will be affected by other inverters and electric network impedance, and it is to shunt chopper
The inhibition of system resonance and mutual Harmonic Control still need further to be studied, active damping method simultaneously
Need again to upgrade the control algolithm of DSP in combining inverter, it is achieved the tool that gets up acquires a certain degree of difficulty, and changes combining inverter
Operational mode, the normal service life of inverter may be reduced.
In recent years, scholar is had to propose to use outside centralized resonance restraining device that system resonance is suppressed.By resonance
Restraining device typically with other inverter be installed in parallel together points of common connection (Point of Common Coupling,
PCC), this method, without the structure of original mounted inverter of upgrading or control algolithm, nor affects on inverter original
Mode of operation, can improve the service life of inverter.According to the difference of control mode, resonance restraining device can be divided into passive and
Active type.The input of actual resistance in passive resonance restraining device, it will increase the energy loss of system, the most also will impact
And the quality of voltage of site.Active type resonance restraining device uses virtual impedance to replace actual resistance, thus without the volume of increasing
Outer system active power loss.
Summary of the invention
The technical problem to be solved is to provide a kind of simple and direct be easily achieved, to active distribution network operating condition
Strong adaptability, it is simple to the outside centralized distributed photovoltaic power generation cluster resonance inhibiting system of practical engineering application and suppression side
Method.
The technical solution adopted in the present invention is: a kind of outside centralized distributed photovoltaic power generation cluster resonance suppression is
System, including distributed photovoltaic power generation cluster and inverter, described distributed photovoltaic power generation cluster and inverter are commonly through distribution
Netting twine road is incorporated to power distribution network, and described inverter connects the output electric current for controlling inverter, reaches resonance suppression purpose
Central control unit, described central control unit includes DC voltage controller, current controller and resonant controller, its
In, the signal output part of described current controller connects the input of inverter for controlling the output electric current of inverter, electric current
The input of controller connects DC voltage controller and the signal output part of resonant controller and the reality of inverter respectively
Output electric current, the signal input part of described DC voltage controller connects Converter DC-side capacitance voltage reference value U respectivelydcref
With Converter DC-side electric capacity actual voltage value Udc, the signal input part of described resonant controller connects distribution network line reality electricity
Pressure Upcc。
Described DC voltage controller includes: the first subtractor, PI controller and the first coordinate transformation unit, its
In, the input of described first subtractor connects Converter DC-side capacitance voltage reference value U respectivelydcrefAnd Converter DC-side
Electric capacity actual voltage value Udc, the outfan of described first subtractor connects the input of PI controller, described first coordinate transform
The input of unit connects d shaft current reference value i of PI controller respectivelydrefOutfan and constant iqref=0, described first sits
Outfan output fundamental current reference value i of mark converter unitαβref_1Connect current controller.
Described resonant controller includes the Resonance detector unit and the 4th multiplier being sequentially connected in series, wherein, described humorous
The signal input part of detector unit of shaking connects distribution network line virtual voltage Upcc, the output of described 4th multiplier connects described
The signal input part of current controller.
Described Resonance detector unit includes: the second subtractor of being sequentially connected in series, the 5th multiplier, the 3rd subtraction
Device, the 6th multiplier, first integrator, second integral device, the 7th multiplier, the 8th multiplier, the 9th multiplier and SANJI
Dividing device, wherein, the signal input part of described second subtractor connects distribution network line virtual voltage U respectivelypccWith Resonance detector list
The resonance subharmonic voltage u of unitrOutfan, described second subtractor estimated value error UerrorOutfan is also connected with the 8th multiplier
Input, the outfan of described 7th multiplier is also connected with the input of described 3rd subtractor, described third integral device
Outfan connects described 6th multiplier and the input of the 7th multiplier respectively, and the outfan of described first integrator is also constituted
The resonance subharmonic voltage u of Resonance detector unitrOutfan.
Described current controller includes: adder-subtractor, the first multiplier, the second multiplier, the 3rd multiplier, addition
Device, the second coordinate transformation unit and pwm unit, wherein, it is voltage-controlled that the input of described adder-subtractor connects unidirectional current respectively
Fundamental current reference value i of device processedαβref_1Harmonic current reference value i of outfan and resonant controllerαβref_rOutfan and
The inverter actual α β axle output electric current i of two coordinate transformation unitαβOutfan, the input of described second coordinate transformation unit is
Inverter actual output current if, the outfan of described adder-subtractor connects the first multiplier, the second multiplier and the 3rd respectively
The input of multiplier, the outfan of described first multiplier, the second multiplier and the 3rd multiplier all connects adder, institute
The outfan stating adder connects the input of pwm unit, and the outfan of described pwm unit connects inverter
Input.
The suppressing method of the outside centralized distributed photovoltaic power generation cluster resonance inhibiting system of the present invention, including walking as follows
Rapid:
1) Current Transformer is made to measure actual output current i of inverterf, use voltage measuring transformer inverter
DC side actual capacitance voltage UdcWith distribution network line virtual voltage Upcc, and by described actual output current if, actual capacitance
Voltage UdcWith actual electric network line voltage UpccSend into central control unit；
2) by step 1) the actual capacitance voltage U that obtainsdcWith the direct voltage reference value U setdcrefCompare, will
Both differences are sent into PI controller and are obtained d shaft current reference value idref, by idrefSame iqref=0 together carries out coordinate transform obtains
To fundamental current reference value iαβref_1；
3) by step 1) the distribution network line virtual voltage U that obtainspccThe Resonance detector unit sent in resonant controller obtains
To resonance subharmonic voltage Ur, by resonance subharmonic voltage UrIt is multiplied by virtual resonant conductance Yv, obtain the harmonic current ginseng of inverter
Examine value iabref_r；
4) by step 1) actual output current i that obtainsfCarry out coordinate transform, obtain the actual α of the inverter shown in Fig. 2
β shaft current iαβ；
5) by step 2) obtain fundamental current reference value iαβref_1With step 3) obtain harmonic current reference value iabref_rSynchronize
Rapid 4) actual α β shaft current i obtainedαβSend into current controller together, obtain output signal Uref,
Current controller is expressed from the next:
In formula, KpFor the gain of current controller, wfFor fundamental frequency, wrThe resonant frequency obtained for Resonance detector link,
wcFor cut-off frequency, s is Laplace operator, KfFor first-harmonic gain, KrFor harmonics.
6) by step 5) output signal U of current controller that obtainsrefIt is sent to inverter, controls inverter reality defeated
Go out electric current if。
The outside centralized distributed photovoltaic power generation cluster resonance inhibiting system of the present invention and suppressing method, by system
The detection of resonant frequency, only adds a damping conductance in parallel at resonant frequency, increases system damping, effective damping dynamically
The harmonic resonance of system.Meanwhile, also introduce quasi-PR and control, overcome photovoltaic cluster and access to traditional PR controller stable state by mistake
The adverse effect that difference and robust performance bring.The method of the present invention is simple and direct to be easily achieved, and adapts to active distribution network operating condition
Property is strong, it is simple to practical engineering application.
Accompanying drawing explanation
Fig. 1 is the simplified schematic diagram of the outside centralized distributed photovoltaic power generation cluster resonance inhibiting system of the present invention；
Fig. 2 is the control block diagram of the central control unit in the present invention；
Fig. 3 is the control principle drawing of DC voltage controller in central control unit；
Fig. 4 be central control unit resonant controller in the schematic diagram of Resonance detector unit；
Fig. 5 is the control principle drawing of current controller in central control unit；
Fig. 6 is to use networking current diagram before and after resonance suppressing method of the present invention；
Networking electric current THD when Fig. 7 is not use resonance suppressing method of the present invention；
Networking electric current THD when Fig. 8 is to use resonance suppressing method of the present invention；
Fig. 9 is that inverter exports current diagram；
Figure 10 is that inverter exports electric current THD.
In figure
1: distributed photovoltaic power generation cluster 2: inverter
3: central control unit 4: DC voltage controller
5: current controller 6: resonant controller
7: distribution network line 11: photovoltaic cell
12: photovoltaic DC-to-AC converter 13:LCL wave filter
41: the first subtractor 42:PI controllers
43: the first coordinate transformation unit 51: adder-subtractor
52: the first multiplier 53: the second multipliers
54: the three multipliers 55: adder
56: the second coordinate transformation unit 57: pwm unit
61: Resonance detector unit 62: the four multiplier
63: the second subtractor 64: the five multipliers
65: the three subtractor 66: the six multipliers
67: the seven multipliers 68: first integrator
69: second integral device 70: the eight multiplier
71: the nine multipliers 72: third integral device
Detailed description of the invention
The outside centralized distributed photovoltaic power generation cluster resonance suppression system to the present invention below in conjunction with embodiment and accompanying drawing
System and suppressing method are described in detail.
As it is shown in figure 1, the outside of the present invention centralized distributed photovoltaic power generation cluster resonance inhibiting system, including distributed
Photovoltaic generation cluster 1 and inverter 2, described distributed photovoltaic power generation cluster 1 and inverter 2 are commonly through distribution network line 7 also
Entering power distribution network, described inverter 2 connects the output electric current for controlling inverter 2, reaches the central authorities of resonance suppression purpose
Control unit 3, i.e. controlled the output electric current of inverter 2 by central control unit 3, reaches the purpose of resonance suppression.Wherein,
Described inverter 2 can select model: XDSVG-380/100；Shanghai Si Yuan electrically/SVG100Kvar kilovar；DBL-SVG100-
4L-400V。
Described central control unit 3 can select Texas Instruments's TMS320C24x/F24x product.As in figure 2 it is shown,
Described central control unit 3 includes DC voltage controller 4, current controller 5 and resonant controller 6, wherein, described electric current control
The signal output part of device 5 processed connects the input of inverter 2 for controlling the output electric current of inverter 2, current controller 5 defeated
Enter end and connect DC voltage controller 4 and the signal output part of resonant controller 6 and the actual output electricity of inverter 2 respectively
Stream, the signal input part of described DC voltage controller 4 connects inverter 2 DC capacitor voltage reference value U respectivelydcrefWith change
Stream device 2 DC bus capacitor actual voltage value Udc, the signal input part of described resonant controller 6 connects distribution network line virtual voltage
Upcc。
Described DC voltage controller 4 compensates performance for the power attenuation and optimization inverter 2 reducing inverter 2.As
Shown in Fig. 3, described DC voltage controller 4 includes: the first subtractor 41, PI controller 42 and the first coordinate transformation unit
43, wherein, the input of described first subtractor 41 connects inverter 2 DC capacitor voltage reference value U respectivelydcrefAnd the change of current
Device 2 DC bus capacitor actual voltage value Udc, the outfan of described first subtractor 41 connects the input of PI controller 42, described
The input of the first coordinate transformation unit 43 connects d shaft current reference value i of PI controller 42 respectivelydrefOutfan and constant
iqref=0, outfan output fundamental current reference value i of described first coordinate transformation unit 43αβref_1Connect current controller 5.
Described first coordinate transformation unit 43 is tied to the conversion of α β coordinate system for dq coordinate.
Resonant controller 6 is the core of resonance suppressing method, and described resonant controller Main Function is to pass through Resonance detector
Unit extracts resonance subharmonic voltage, then is multiplied by virtual resonant conductance Yv, i.e. obtain the harmonic current reference value of inverter 2
iαβref_r, at resonant frequency, add a damping conductance, increase the damping of system, and then be prevented effectively from the generation of resonance.By
Only being operated at resonant frequency in harmonic wave conductance, first-harmonic does not produce impact, therefore the power grade of inverter 2 is lower.
As in figure 2 it is shown, described resonant controller 6 includes the Resonance detector unit 61 and the 4th multiplier being sequentially connected in series
62, wherein, the signal input part of described Resonance detector unit 61 connects distribution network line virtual voltage Upcc, described 4th multiplication
The output of device 62 connects the signal input part of described current controller 5.
As shown in Figure 4, described Resonance detector unit 61 includes: the second subtractor the 63, the 5th being sequentially connected in series is taken advantage of
Musical instruments used in a Buddhist or Taoist mass the 64, the 3rd subtractor the 65, the 6th multiplier 66, first integrator 68, second integral device the 69, the 7th multiplier the 67, the 8th
Multiplier the 70, the 9th multiplier 71 and third integral device 72, the signal input part of described second subtractor 63 connects distribution respectively
Netting twine road virtual voltage UpccResonance subharmonic voltage u with resonance detector unit 61rOutfan, described second subtractor 63 is estimated
Evaluation error UerrorOutfan is also connected with the input of the 8th multiplier 70, and the outfan of described 7th multiplier 67 is orthogonal letter
Number qu' outfan is also connected with the input of described 3rd subtractor 65, and the outfan of described third integral device 72 connects institute respectively
Stating the 6th multiplier 66 and the input of the 7th multiplier 67, the outfan of described first integrator 68 also constitutes Resonance detector list
The resonance subharmonic voltage u of unit 61rOutfan.The outfan of the 8th multiplier 70 therein is frequency error variable EfOutfan
Connecting the input of the 9th multiplier 71, the outfan of third integral device 72 is that angular frequency w outfan connects the 9th multiplier 71
Input.
Current controller is used for follow current reference value, and three-phase inverter electric current loop mainly uses PR controller, but PR is controlled
A device gain processed infinitely great gain at resonant frequency can not realize, at disresonance frequence under numeral or analog form
Place's gain is the least.Therefore, when resonant frequency changes, for making inverter can effectively follow the tracks of harmonic current, the present invention uses
A kind of quasi-PR control method, its transmission function is shown below,
In formula, KpBe as the criterion PR controller gain, wfFor fundamental frequency, wrThe resonant frequency obtained for Resonance detector link, wc
For cut-off frequency, s is Laplace operator, KfFor first-harmonic gain, KrFor harmonics.
As it is shown in figure 5, current controller 5 of the present invention includes: adder-subtractor the 51, first multiplier 52, second take advantage of
Musical instruments used in a Buddhist or Taoist mass the 53, the 3rd multiplier 54, adder the 55, second coordinate transformation unit 56 and pwm unit 57, wherein, described plus-minus
The input of musical instruments used in a Buddhist or Taoist mass 51 connects fundamental current reference value i of DC voltage controller 4 respectivelyαβref_1Outfan and resonant controller
Harmonic current reference value i of 6αβref_rThe inverter actual α β axle output electric current i of outfan and the second coordinate transformation unit 56αβ
Outfan, the input of described second coordinate transformation unit 56 is inverter 2 actual output current if, described adder-subtractor 51
Outfan connects the first multiplier the 52, second multiplier 53 and input of the 3rd multiplier 54, described first multiplier respectively
52, the outfan of the second multiplier 53 and the 3rd multiplier 54 all connects adder 55, and the outfan of described adder 55 is even
Connecing the input of pwm unit 57, the outfan of described pwm unit 57 connects the input of inverter 2.Described
Two coordinate transformation unit 56 are tied to the conversion of α β coordinate system for abc coordinate.
The suppressing method of the outside centralized distributed photovoltaic power generation cluster resonance inhibiting system of the present invention, including walking as follows
Rapid:
1) Current Transformer is made to measure actual output current i of inverterf, use voltage measuring transformer inverter
DC side actual capacitance voltage UdcWith distribution network line virtual voltage Upcc, and by described actual output current if, actual capacitance
Voltage UdcWith actual electric network line voltage UpccSend into central control unit；
2) by step 1) the actual capacitance voltage U that obtainsdcWith the direct voltage reference value U setdcrefCompare, will
Both differences are sent into PI controller and are obtained d shaft current reference value idref, by idrefSame iqref=0 together carries out coordinate transform obtains
To fundamental current reference value iαβref_1；
3) by step 1) the distribution network line virtual voltage U that obtainspccThe Resonance detector unit sent in resonant controller obtains
To resonance subharmonic voltage Ur, by resonance subharmonic voltage UrIt is multiplied by virtual resonant conductance Yv, obtain the harmonic current ginseng of inverter
Examine value iabref_r；
4) by step 1) actual output current i that obtainsfCarry out coordinate transform, obtain the actual α of the inverter shown in Fig. 2
β shaft current iαβ；
5) by step 2) obtain fundamental current reference value iαβref_1With step 3) obtain harmonic current reference value iabref_rSynchronize
Rapid 4) actual α β shaft current i obtainedαβSend into current controller together, obtain output signal Uref,
Current controller is expressed from the next:
In formula, KpFor the gain of current controller, wfFor fundamental frequency, wrThe resonant frequency obtained for Resonance detector link,
wcFor cut-off frequency, s is Laplace operator, KfFor first-harmonic gain, KrFor harmonics.
6) by step 5) output signal U of current controller that obtainsrefIt is sent to inverter, controls inverter reality defeated
Go out electric current if。
In order to verify the suppressing method of the outside of the present invention centralized distributed photovoltaic power generation cluster resonance inhibiting system
Correctness and feasibility, set up the power distribution network that electric pressure is 380V (line voltage), be made up of two inverters in distribution.Inversion
In device LCL filter, L1=1mH, L2=0.1mH, C=210uF.In resonance restraining device.
Fig. 6 to Fig. 8 is to add the networking current diagram before and after active damper and THD, by figure it will be seen that ought be not
When adding active damper device, there is obvious resonance phenomena in two parallelly connected reverse converter systems, the harmonic wave of resonant frequency time is bright
Aobvious amplification, aberration rate has reached the 18% of fundamental voltage amplitude.And when adding after active damper, the resonance of parallelly connected reverse converter system
Phenomenon is significantly suppressed, and the percent harmonic distortion of resonant frequency time drops to the 3% of fundamental voltage amplitude.
Fig. 9, Figure 10 are respectively current waveform and the THD that active damper compensates, it can be seen that active damper
The harmonic current frequency of output is mainly 1280Hz, matches with the resonant frequency of system, and i.e. active damper is only to resonance frequency
Rate time network injects damping suppression system resonance, thus demonstrates correctness and the effectiveness of institute's extracting method herein.
From simulation result, the outside centralized distributed photovoltaic power generation cluster resonance inhibiting system of the application present invention
Suppressing method, in the case of not affecting system fundamental voltage, can effectively suppress the resonance of distributed photovoltaic system.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement,
All should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is as the criterion.
Claims (6)
1. the centralized distributed photovoltaic power generation in an outside cluster resonance inhibiting system, including distributed photovoltaic power generation cluster (1)
With inverter (2), described distributed photovoltaic power generation cluster (1) and inverter (2) are incorporated to distribution commonly through distribution network line (7)
Net, it is characterised in that described inverter (2) connects the output electric current for controlling inverter (2), reaches resonance suppression mesh
Central control unit (3), described central control unit (3) include DC voltage controller (4), current controller (5) and
Resonant controller (6), wherein, the signal output part of described current controller (5) connects the input of inverter (2) and is used for controlling
The output electric current of inverter (2), the input of current controller (5) connects DC voltage controller (4) respectively and controls with resonance
The signal output part of device (6) and the actual output current of inverter (2), the signal input of described DC voltage controller (4)
End connects inverter (2) DC capacitor voltage reference value U respectivelydcrefWith inverter 2 DC bus capacitor actual voltage value Udc,
The signal input part of described resonant controller (6) connects distribution network line virtual voltage Upcc。
Outside the most according to claim 1 centralized distributed photovoltaic power generation cluster resonance inhibiting system, it is characterised in that
Described DC voltage controller (4) includes: the first subtractor (41), PI controller (42) and the first coordinate transformation unit
(43), wherein, the input of described first subtractor (41) connects inverter (2) DC capacitor voltage reference value U respectivelydcref
With inverter (2) DC bus capacitor actual voltage value Udc, the outfan of described first subtractor (41) connects PI controller (42)
Input, the input of described first coordinate transformation unit (43) connects the d shaft current reference value of PI controller (42) respectively
idrefOutfan and constant iqref=0, the outfan output fundamental current reference value of described first coordinate transformation unit (43)
iαβref_1Connect current controller (5).
Outside the most according to claim 1 centralized distributed photovoltaic power generation cluster resonance inhibiting system, it is characterised in that
Described resonant controller (6) includes the Resonance detector unit (61) and the 4th multiplier (62) being sequentially connected in series, wherein, described
The signal input part of Resonance detector unit (61) connects distribution network line virtual voltage Upcc, described 4th multiplier (62) defeated
Go out the signal input part connecting described current controller (5).
Outside the most according to claim 3 centralized distributed photovoltaic power generation cluster resonance inhibiting system, it is characterised in that
Described Resonance detector unit (61) including: the second subtractor (63) of being sequentially connected in series, the 5th multiplier (64), the 3rd subtracts
Musical instruments used in a Buddhist or Taoist mass (65), the 6th multiplier (66), first integrator (68), second integral device (69), the 7th multiplier (67), the 8th multiplication
Device (70), the 9th multiplier (71) and third integral device (72), wherein, the signal input part of described second subtractor (63) is respectively
Connect distribution network line virtual voltage UpccResonance subharmonic voltage u with resonance detector unit (61)rOutfan, described second
Subtractor (63) estimated value error UerrorOutfan is also connected with the input of the 8th multiplier (70), described 7th multiplier (67)
Outfan be also connected with the input of described 3rd subtractor (65), the outfan of described third integral device (72) connects institute respectively
Stating the 6th multiplier (66) and the input of the 7th multiplier (67), the outfan of described first integrator (68) also constitutes resonance
The resonance subharmonic voltage u of detector unit (61)rOutfan.
Outside the most according to claim 1 centralized distributed photovoltaic power generation cluster resonance inhibiting system, it is characterised in that
Described current controller (5) including: adder-subtractor (51), the first multiplier (52), the second multiplier (53), the 3rd multiplier
(54), adder (55), the second coordinate transformation unit (56) and pwm unit (57), wherein, described adder-subtractor (51)
Input connect fundamental current reference value i of DC voltage controller (4) respectivelyαβref_1Outfan and resonant controller (6)
Harmonic current reference value iαβref_rThe inverter actual α β axle output electric current of outfan and the second coordinate transformation unit (56)
iαβOutfan, the input of described second coordinate transformation unit (56) is inverter (2) actual output current if, described addition and subtraction
The outfan of device (51) connects the first multiplier (52), the second multiplier (53) and the input of the 3rd multiplier (54) respectively,
The outfan of described first multiplier (52), the second multiplier (53) and the 3rd multiplier (54) all connects adder (55),
The outfan of described adder (55) connects the input of pwm unit (57), the output of described pwm unit (57)
End connects the input of inverter (2).
6. a suppressing method for the outside centralized distributed photovoltaic power generation cluster resonance inhibiting system described in claim 1,
It is characterized in that, comprise the steps:
1) Current Transformer is made to measure actual output current i of inverterf, use the direct current of voltage measuring transformer inverter
Side actual capacitance voltage UdcWith distribution network line virtual voltage Upcc, and by described actual output current if, actual capacitance voltage
UdcWith actual electric network line voltage UpccSend into central control unit；
2) by step 1) the actual capacitance voltage U that obtainsdcWith the direct voltage reference value U setdcrefCompare, by both
Difference is sent into PI controller and is obtained d shaft current reference value idref, by idrefSame iqref=0 together carries out coordinate transform obtains first-harmonic
Current reference value iαβref_1；
3) by step 1) the distribution network line virtual voltage U that obtainspccThe Resonance detector unit sent in resonant controller obtains humorous
Shake frequency harmonic voltage Ur, by resonance subharmonic voltage UrIt is multiplied by virtual resonant conductance Yv, obtain the harmonic current reference value of inverter
iabref_r；
4) by step 1) actual output current i that obtainsfCarry out coordinate transform, obtain the actual α β axle electricity of the inverter shown in Fig. 2
Stream iαβ；
5) by step 2) obtain fundamental current reference value iαβref_1With step 3) obtain harmonic current reference value iabref_rSame step 4)
Actual α β shaft current i obtainedαβSend into current controller together, obtain output signal Uref,
Current controller is expressed from the next:
In formula, KpFor the gain of current controller, wfFor fundamental frequency, wrThe resonant frequency obtained for Resonance detector link, wcFor
Cut-off frequency, s is Laplace operator, KfFor first-harmonic gain, KrFor harmonics.
6) by step 5) output signal U of current controller that obtainsrefIt is sent to inverter, controls inverter actual output electricity
Stream if。
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