CN104917180B - A kind of suppressing method and device of collecting and distributing type photovoltaic generating system resonance - Google Patents
A kind of suppressing method and device of collecting and distributing type photovoltaic generating system resonance Download PDFInfo
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- CN104917180B CN104917180B CN201510341050.0A CN201510341050A CN104917180B CN 104917180 B CN104917180 B CN 104917180B CN 201510341050 A CN201510341050 A CN 201510341050A CN 104917180 B CN104917180 B CN 104917180B
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
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Abstract
The present invention discloses a kind of suppressing method and device of collecting and distributing type photovoltaic generating system resonance, and by receiving sampled data, harmonic wave extraction is carried out to sampled data；Further according to the result of harmonic wave extraction, judge whether collecting and distributing type photovoltaic generating system currently occurs resonance；When judging to occur resonance, simultaneously output control signal is generated, adjusts the working frequency of collecting and distributing type photovoltaic generating system；So that working frequency and the resonant frequency of resonance stagger, the suppression for resonance is realized, and then ensure that the stable operation of system.
Description
Technical field
The present invention relates to photovoltaic generating system technical field, more particularly to a kind of suppression of collecting and distributing type photovoltaic generating system resonance
Method and device processed.
Background technology
Collecting and distributing type photovoltaic generating system of the prior art, by prime intelligent junction box and rear class centralized inverter group
Into.It is attached between the prime intelligent junction box and the rear class centralized inverter by longer cable.Due to line
Stray inductance L be present in cableSEtc. parameter, so as in the interface of the prime intelligent junction box and the rear class centralized inverter
The multistage networks of CLC are formed, as shown in figure 1, the multistage networks of the CLC include the equivalent output capacitance of equivalent intelligent junction box
Cpvbox-o, the cable stray inductance LSAnd the direct current input capacitance C of the rear class centralized inverterinv-i。
, will when the resonant frequency of the multistage networks of the CLC is near the working frequency of collecting and distributing type photovoltaic generating system
Resonance is produced, has a strong impact on the stability of collecting and distributing type photovoltaic generating system.
The content of the invention
In view of this, the invention provides a kind of suppressing method and device of collecting and distributing type photovoltaic generating system resonance, with solution
The problem of certainly having an impact the resonance of the stability of a system in the prior art.
A kind of suppressing method of collecting and distributing type photovoltaic generating system resonance, including：
Sampled data is received, harmonic wave extraction is carried out to the sampled data；
The result extracted according to the harmonic wave, judges whether collecting and distributing type photovoltaic generating system currently occurs resonance；
When judging to occur resonance, simultaneously output control signal is generated, adjusts the work of the collecting and distributing type photovoltaic generating system
Frequency.
Preferably, the step of carrying out harmonic wave extraction to the sampled data includes：
Extract each harmonic content；
According to each harmonic cubage resonance amplitude virtual value of extraction.
Preferably, the extraction each harmonic content includes：
Pass throughExtract each harmonic content；
Wherein, Es(n) it is the discrete signal of the sampled data, X (k) is the k subharmonic in each harmonic content
Content, N are total sampling number,Weight is calculated for FFT, k is overtone order.
Preferably, the step of each harmonic cubage resonance amplitude virtual value according to extraction is：
Choose resonant frequency section [fmin,fmax], pass throughCalculate resonant frequency section
[fmin,fmax] resonance amplitude virtual value Ur；
Wherein, N1For frequency band [fmin,fmax] in the total degree containing harmonic wave, M1For frequency fminCorresponding overtone order,
M2For frequency fmaxCorresponding overtone order, Uamp(k) it is the kth subharmonic amplitude obtained by fft analysis,
Preferably, it is described to judge whether collecting and distributing type photovoltaic generating system currently occurs resonance, including：
Whether the resonance amplitude virtual value is judged beyond the threshold value pre-set, wherein：If the resonance amplitude is effective
Value exceeds the threshold value pre-set, then judges that resonance occurs for the collecting and distributing type photovoltaic generating system.
Preferably, when judging to occur resonance, simultaneously output control signal is generated, including：
When judging to occur resonance, pass through Ue=Urmax-UrInput error signal is calculated；Wherein, UeFor the input
Error signal, UrmaxFor the threshold value, UrFor the resonance amplitude virtual value；
Ratio control, proportional, integral control or ratio-resonance control are carried out to the input error signal, obtains institute
State control signal.
A kind of restraining device of collecting and distributing type photovoltaic generating system resonance, including：
Extraction unit, for receiving sampled data, harmonic wave extraction is carried out to the sampled data；
The judging unit being connected with the extraction unit, for the result extracted according to the harmonic wave, judge collecting and distributing type light
Whether photovoltaic generating system currently occurs resonance；
The control production units being connected with the judging unit, for when judging to occur resonance, generating and exporting control
Signal processed, adjust the working frequency of the collecting and distributing type photovoltaic generating system.
Preferably, the extraction unit includes：
First module, for extracting each harmonic content；
The second unit being connected with the first module and the judging unit, for each harmonic content according to extraction
Calculate resonance amplitude virtual value.
Preferably, the first module is used to pass through
Extract each harmonic content；
Wherein, Es(n) it is the discrete signal of the sampled data, the k subharmonic in X (k) each harmonic contents contains
Amount, N is total sampling number,Weight is calculated for FFT, k is overtone order.
Preferably, the second unit is used for：
Choose resonant frequency section [fmin,fmax], pass throughCalculate resonant frequency section
[fmin,fmax] resonance amplitude virtual value Ur；
Wherein, N1For frequency band [fmin,fmax] in the total degree containing harmonic wave, M1For frequency fminCorresponding overtone order,
M2For frequency fmaxCorresponding overtone order, Uamp(k) it is the kth subharmonic amplitude obtained by fft analysis,
Preferably, the judging unit is used to judge whether collecting and distributing type photovoltaic generating system currently occurs specifically to use during resonance
In：
Whether the resonance amplitude virtual value is judged beyond the threshold value pre-set, wherein：If the resonance amplitude is effective
Value exceeds the threshold value pre-set, then judges that resonance occurs for the collecting and distributing type photovoltaic generating system.
Preferably, the control production units include：
The third unit being connected with the judging unit, for when judging to occur resonance, passing through Ue=Urmax-UrCalculate
Obtain input error signal；Wherein, UeFor the input error signal, UrmaxFor the threshold value, UrIt is effective for the resonance amplitude
Value；
The Unit the 4th being connected with the third unit, for the input error signal is carried out ratio control, ratio-
Integration control or ratio-resonance control, obtain the control signal.
The suppressing method of collecting and distributing type photovoltaic generating system resonance disclosed by the invention, by receiving sampled data, to described
Sampled data carries out harmonic wave extraction；Further according to the result of harmonic wave extraction, judge collecting and distributing type photovoltaic generating system it is current whether
Generation resonance；When judging to occur resonance, simultaneously output control signal is generated, adjusts the work of the collecting and distributing type photovoltaic generating system
Frequency；So that the working frequency and the resonant frequency of the resonance stagger, the suppression for the resonance is realized, and then ensure
The stable operation of system.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of collecting and distributing type photovoltaic generating system disclosed in prior art；
Fig. 2 is the suppressing method flow chart of collecting and distributing type photovoltaic generating system resonance disclosed in the embodiment of the present invention；
Fig. 3 is the suppressing method flow chart of collecting and distributing type photovoltaic generating system resonance disclosed in another embodiment of the present invention；
Fig. 4 is the restraining device structural representation of collecting and distributing type photovoltaic generating system resonance disclosed in another embodiment of the present invention
Figure；
Fig. 5 is the restraining device structural representation of collecting and distributing type photovoltaic generating system resonance disclosed in another embodiment of the present invention
Figure.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
The invention provides a kind of suppressing method of collecting and distributing type photovoltaic generating system resonance, to solve in the prior art easily production
The problem of resonance of the raw influence stability of a system.
Specifically, as shown in Fig. 2 the suppressing method of the collecting and distributing type photovoltaic generating system resonance, including：
S101, sampled data is received, harmonic wave extraction is carried out to the sampled data；
The sampled data is that the various sampling units in the collecting and distributing type photovoltaic generating system sample obtained data, such as
Intelligent junction box output voltage u in Fig. 1pvbox-oWith output current ipvbox-o, centralized inverter input voltage uinv-iWith it is defeated
Enter electric current iinv-i.Then the sampled data is sent to microprocessor, and the sampled data is carried out by the microprocessor
Receive and harmonic wave extracts.
S102, the result extracted according to the harmonic wave, judge whether collecting and distributing type photovoltaic generating system currently occurs resonance；
Judge the current state of the collecting and distributing type photovoltaic generating system, obtain whether it occurs the result of resonance, after being used for
Continuous processing.
S103, when judge occur resonance when, generate and output control signal, adjust the collecting and distributing type photovoltaic generating system
Working frequency.
Because the length of cable between intelligent junction box and centralized inverter is not fixed, so humorous when resonance occurs
Vibration frequency is not also fixed, and is not easy to adjust, and in order to realize the suppression for the resonance, ensures the stable operation of system, can
With the working frequency by adjusting the collecting and distributing type photovoltaic generating system, realization is staggered with the resonant frequency of the resonance.
, can be by adjusting the switching frequency of switching tube in intelligent junction box, described in realization in specific practical application
The adjustment of the working frequency of collecting and distributing type photovoltaic generating system.
The control signal is exported when the present embodiment is by occurring resonance, adjusts the work of the collecting and distributing type photovoltaic generating system
Working frequency, staggering for the working frequency and the resonant frequency of the resonance is realized, and then realizes the suppression for the resonance,
And then it ensure that the stable operation of system.
Preferably, as shown in figure 3, step S101 includes：
S201, extraction each harmonic content；
The implementation method of extraction each harmonic content has a lot, and the present embodiment is with FFT (Fast Fourier
Transformation, fast Fourier transform) illustrate exemplified by algorithm：
Specifically, fft algorithm can pass throughExtraction
Each harmonic content；
Wherein, Es(n) it is discrete signal (the intelligent junction box output voltage u in such as Fig. 1 of the sampled datapvbox-oWith
Output current ipvbox-o, centralized inverter input voltage uinv-iWith input current iinv-i), X (k) is the sampled data FFT
The frequency domain respective value of analysis, i.e., the k subharmonic contents in described each harmonic content, N is total sampling number,Counted for FFT
Weight is calculated, k is overtone order.
Received by the multiple repairing weld of the discrete signal to the sampled data, described adopt is calculated using above-mentioned formula
The frequency domain respective value of sample data fft analysis, and then extract each harmonic content.
S202, each harmonic cubage resonance amplitude virtual value according to extraction.
First, resonant frequency section [f is chosenmin,fmax], then pass throughCalculate resonance
Frequency band [fmin,fmax] resonance amplitude virtual value Ur；
Wherein, N1For frequency band [fmin,fmax] in the total degree containing harmonic wave, M1For frequency fminCorresponding overtone order,
M2For frequency fmaxCorresponding overtone order, Uamp(k) it is the kth subharmonic amplitude obtained by fft analysis,
Resonant frequency section [fmin,fmax] selection can be selected according to specific actual conditions, different selection knots
Fruit, different control signals can be also obtained, in specific practical application, can repeatedly be imitated according to its actual cable length
True experiment, to obtain more suitable resonant frequency section.Or the resonant frequency section can also be derived by according to calculating, this
Place is not specifically limited.
It is corresponding, judge that the foundation whether collecting and distributing type photovoltaic generating system currently occurs resonance is in step S102：Judge
Whether the resonance amplitude virtual value is beyond the threshold value pre-set.
If the resonance amplitude virtual value exceeds the threshold value pre-set, the collecting and distributing type photovoltaic generating system hair is judged
Raw resonance.
The threshold value also should be what is be configured according to specific actual conditions, be not specifically limited herein, can regard it
Depending on application environment.
Now, step S103 includes：
When judging to occur resonance, pass through Ue=Urmax-UrInput error signal is calculated；Wherein, UeFor the input
Error signal, UrmaxFor the threshold value, UrFor the resonance amplitude virtual value；
Ratio control or proportional, integral control or ratio-resonance control are carried out to the input error signal, is obtained
To the control signal.
The concrete methods of realizing for obtaining the control signal can not done specific herein depending on the specific requirement of system
Limit, as long as the control signal of generation can adjust the working frequency of system, so that the working frequency and the resonance
Frequency staggers.
Wherein, illustrated exemplified by using ratio control, the formula for obtaining the control signal is：
Wherein, kτFor proportional control factor, Δ UoFor the control signal, UoFor the intermediate quantity of the control signal, Uomax
To allow the maximum of the control signal of output, Δ U is avoidedoTransient change is excessive to cause system operating frequency adjustment super
Adjust, be unfavorable for the stability of a system.
The collecting and distributing type photovoltaic generating system is according to control signal Δ UoDynamic adjusts switching tube in the intelligent junction box
Switching frequency, with adjust the working frequency of the collecting and distributing type photovoltaic generating system (its adjustment direction is not specifically limited herein,
It can stagger with the resonant frequency)；It is described when the working frequency of the collecting and distributing type photovoltaic generating system changes
The resonance amplitude of collecting and distributing type photovoltaic generating system can reduce, the resonance amplitude virtual value UrAlso can change therewith, it is raw after change
Into new control signal Δ UoThe working frequency of the collecting and distributing type photovoltaic generating system can be adjusted again, so as to form a closed loop
Control system, realize the purpose for suppressing resonance.
The suppressing method for the collecting and distributing type photovoltaic generating system resonance that the present embodiment provides, can effectively suppress collecting and distributing type
The resonance of system intelligent junction box and inverter interface, so as to improve the stability of collecting-distributing system, goes for any
The collecting-distributing system of capacity；Realize that harmonic wave extracts using intelligent junction box itself sampling quantity simultaneously, and resonance suppresses, and does not increase
Add any hardware cost, be easy to collecting and distributing type scheme to promote and use.
Another embodiment of the present invention additionally provides a kind of restraining device of collecting and distributing type photovoltaic generating system resonance, such as Fig. 4 institutes
Show, including：
Extraction unit 101；
The judging unit 102 being connected with extraction unit 101；
The control production units 103 being connected with judging unit 102.
Extraction unit 101 receives sampled data, and harmonic wave extraction is carried out to the sampled data.Judging unit 102 is according to institute
The result of harmonic wave extraction is stated, judges whether collecting and distributing type photovoltaic generating system currently occurs resonance.When judging to occur resonance, control
The generation of production units 103 and output control signal, the working frequency of the collecting and distributing type photovoltaic generating system is adjusted, so that described
Working frequency and the resonant frequency of the resonance stagger, and realize the suppression for the resonance, and then ensure that the stabilization of system
Operation, go for the collecting-distributing system of any capacity；Realize that harmonic wave extracts using intelligent junction box itself sampling quantity simultaneously,
And resonance suppresses, and does not increase any hardware cost, it is easy to collecting and distributing type scheme to promote and use.
Preferably, as shown in figure 5, extraction unit 101 includes：
First module 111；
The second unit 112 being connected with first module 111 and judging unit 102.
Specifically operation principle is：
First module 111 extracts each harmonic content；The implementation method of extraction each harmonic content has a lot, the present embodiment
To be illustrated exemplified by FFT (Fast Fourier Transformation, fast Fourier transform) algorithm：
Specifically, fft algorithm can pass throughExtraction is each
Subharmonic content；
Wherein, Es(n) it is discrete signal (the intelligent junction box output voltage u in such as Fig. 1 of the sampled datapvbox-oWith
Output current ipvbox-o, centralized inverter input voltage uinv-iWith input current iinv-i), X (k) is the sampled data FFT
The frequency domain respective value of analysis, i.e., the k subharmonic contents in described each harmonic content, N is total sampling number,Counted for FFT
Weight is calculated, k is overtone order.
Received by the multiple repairing weld of the discrete signal to the sampled data, described adopt is calculated using above-mentioned formula
The frequency domain respective value of sample data fft analysis, and then extract each harmonic content.
Second unit 112 is according to each harmonic cubage resonance amplitude virtual value of extraction.
First, resonant frequency section [f is chosenmin,fmax], then pass throughCalculate resonance
Frequency band [fmin,fmax] resonance amplitude virtual value Ur；
Wherein, N1For frequency band [fmin,fmax] in the total degree containing harmonic wave, M1For frequency fminCorresponding overtone order,
M2For frequency fmaxCorresponding overtone order, Uamp(k) it is the kth subharmonic amplitude obtained by fft analysis,
Resonant frequency section [fmin,fmax] selection can be selected according to specific actual conditions, different selection knots
Fruit, different control signals can be also obtained, in specific practical application, can repeatedly be imitated according to its actual cable length
True experiment, to obtain more suitable resonant frequency section.Or the resonant frequency section can also be derived by according to calculating, this
Place is not specifically limited.
Corresponding, judging unit 102 judges that the foundation whether collecting and distributing type photovoltaic generating system currently occurs resonance is：Judge
Whether the resonance amplitude virtual value is beyond the threshold value pre-set.
If the resonance amplitude virtual value exceeds the threshold value pre-set, the collecting and distributing type photovoltaic generating system hair is judged
Raw resonance.
The threshold value also should be what is be configured according to specific actual conditions, be not specifically limited herein, can regard it
Depending on application environment.
Now, as shown in figure 5, control production units 103 include：
The third unit 131 being connected with judging unit 102；
The 4th unit 132 being connected with third unit 131.
Third unit 131 passes through U when judging to occur resonancee=Urmax-UrInput error signal is calculated；Wherein,
UeFor the input error signal, UrmaxFor the threshold value, UrFor the resonance amplitude virtual value.
4th unit 132 carries out ratio control, proportional, integral control or ratio-resonance to the input error signal
Control, obtains the control signal.
The concrete methods of realizing for obtaining the control signal can not done specific herein depending on the specific requirement of system
Limit, as long as the control signal of generation can adjust the working frequency of system, so that the working frequency and the resonance
Frequency staggers.
Wherein, illustrated exemplified by using ratio control, the formula for obtaining the control signal is：
Wherein, kτFor proportional control factor, Δ UoFor the control signal, UoFor the intermediate quantity of the control signal, Uomax
To allow the maximum of the control signal of output, Δ U is avoidedoTransient change is excessive to cause system operating frequency adjustment super
Adjust, be unfavorable for the stability of a system.
The collecting and distributing type photovoltaic generating system is according to control signal Δ UoDynamic adjusts switching tube in the intelligent junction box
Switching frequency, with adjust the working frequency of the collecting and distributing type photovoltaic generating system (its adjustment direction is not specifically limited herein,
It can stagger with the resonant frequency)；It is described when the working frequency of the collecting and distributing type photovoltaic generating system changes
The resonance amplitude of collecting and distributing type photovoltaic generating system can reduce, the resonance amplitude virtual value UrAlso can change therewith, it is raw after change
Into new control signal Δ UoThe working frequency of the collecting and distributing type photovoltaic generating system can be adjusted again, so as to form a closed loop
Control system, realize the purpose for suppressing resonance.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (12)
- A kind of 1. suppressing method of collecting and distributing type photovoltaic generating system resonance, it is characterised in that including：Sampled data is received, harmonic wave extraction is carried out to the sampled data；The sampled data is the collecting and distributing type photovoltaic generation Centralized inverter inputs in the output voltage of intelligent junction box and output current, the collecting and distributing type photovoltaic generating system in system Any one in voltage and input current；The result extracted according to the harmonic wave, judges whether collecting and distributing type photovoltaic generating system currently occurs resonance；When judging to occur resonance, simultaneously output control signal is generated, adjusts the switching frequency of switching tube in the intelligent junction box.
- 2. the suppressing method of collecting and distributing type photovoltaic generating system resonance according to claim 1, it is characterised in that adopted to described The step of sample data progress harmonic wave extraction, includes：Extract each harmonic content；According to each harmonic cubage resonance amplitude virtual value of extraction.
- 3. the suppressing method of collecting and distributing type photovoltaic generating system resonance according to claim 2, it is characterised in that the extraction Each harmonic content includes：Pass throughExtract each harmonic content；Wherein, Es(n) be the sampled data discrete signal, X (k) be each harmonic content in k subharmonic contents, N For total sampling number,Weight is calculated for FFT, k is overtone order.
- 4. the suppressing method of collecting and distributing type photovoltaic generating system resonance according to claim 3, it is characterised in that the basis The step of each harmonic cubage resonance amplitude virtual value of extraction is：Choose resonant frequency section [fmin,fmax], pass throughCalculate resonant frequency section [fmin, fmax] resonance amplitude virtual value Ur；Wherein, N1For frequency band [fmin,fmax] in the total degree containing harmonic wave, M1For frequency fminCorresponding overtone order, M2For Frequency fmaxCorresponding overtone order, Uamp(k) it is the kth subharmonic amplitude obtained by fft analysis,
- 5. according to the suppressing method of any described collecting and distributing type photovoltaic generating system resonance of claim 1-4, it is characterised in that institute State and judge whether collecting and distributing type photovoltaic generating system currently occurs resonance, including：Whether resonance amplitude virtual value is judged beyond the threshold value pre-set, wherein：If the resonance amplitude virtual value is beyond pre- The threshold value first set, then judge that resonance occurs for the collecting and distributing type photovoltaic generating system.
- 6. the suppressing method of collecting and distributing type photovoltaic generating system resonance according to claim 5, it is characterised in that when judgement is sent out During raw resonance, simultaneously output control signal is generated, including：When judging to occur resonance, pass through Ue=Urmax-UrInput error signal is calculated；Wherein, UeFor the error originated from input Signal, UrmaxFor the threshold value, UrFor the resonance amplitude virtual value；Ratio control, proportional, integral control or ratio-resonance control are carried out to the input error signal, obtains the control Signal processed.
- A kind of 7. restraining device of collecting and distributing type photovoltaic generating system resonance, it is characterised in that including：Extraction unit, for receiving sampled data, harmonic wave extraction is carried out to the sampled data；The sampled data is the collection Dissipate in formula photovoltaic generating system and concentrated in the output voltage and output current, the collecting and distributing type photovoltaic generating system of intelligent junction box Any one in formula inverter input voltage and input current；The judging unit being connected with the extraction unit, for the result extracted according to the harmonic wave, judge that collecting and distributing type photovoltaic is sent out Whether electric system currently occurs resonance；The control production units being connected with the judging unit, for when judging to occur resonance, generating simultaneously output control letter Number, adjust the switching frequency of switching tube in the intelligent junction box.
- 8. the restraining device of collecting and distributing type photovoltaic generating system resonance according to claim 7, it is characterised in that the extraction Unit includes：First module, for extracting each harmonic content；The second unit being connected with the first module and the judging unit, for each harmonic cubage according to extraction Resonance amplitude virtual value.
- 9. the restraining device of collecting and distributing type photovoltaic generating system resonance according to claim 8, it is characterised in that described first Unit is used to pass throughExtract each harmonic content；Wherein, Es(n) be the sampled data discrete signal, the k subharmonic contents in X (k) each harmonic contents, N is Total sampling number,Weight is calculated for FFT, k is overtone order.
- 10. the restraining device of collecting and distributing type photovoltaic generating system resonance according to claim 9, it is characterised in that described Unit two are used for：Choose resonant frequency section [fmin,fmax], pass throughCalculate resonant frequency section [fmin, fmax] resonance amplitude virtual value Ur；Wherein, N1For frequency band [fmin,fmax] in the total degree containing harmonic wave, M1For frequency fminCorresponding overtone order, M2For Frequency fmaxCorresponding overtone order, Uamp(k) it is the kth subharmonic amplitude obtained by fft analysis,
- 11. according to the restraining device of any described collecting and distributing type photovoltaic generating system resonance of claim 7-10, it is characterised in that The judging unit is used to judge whether collecting and distributing type photovoltaic generating system currently occurs to be specifically used for during resonance：Whether resonance amplitude virtual value is judged beyond the threshold value pre-set, wherein：If the resonance amplitude virtual value is beyond pre- The threshold value first set, then judge that resonance occurs for the collecting and distributing type photovoltaic generating system.
- 12. the restraining device of collecting and distributing type photovoltaic generating system resonance according to claim 11, it is characterised in that the control Production units processed include：The third unit being connected with the judging unit, for when judging to occur resonance, passing through Ue=Urmax-UrIt is calculated Input error signal；Wherein, UeFor the input error signal, UrmaxFor the threshold value, UrFor the resonance amplitude virtual value；The Unit the 4th being connected with the third unit, for carrying out ratio control, proportional, integral to the input error signal Control or ratio-resonance control, obtain the control signal.
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