CN104901568A - Photovoltaic inverter system, photovoltaic inverter and resonance damping method and device thereof - Google Patents
Photovoltaic inverter system, photovoltaic inverter and resonance damping method and device thereof Download PDFInfo
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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
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The present invention discloses a photovoltaic inverter system, a photovoltaic inverter and a resonance damping method and device thereof. When resonance oscillation occurs at a point of common coupling (PCC) of M photovoltaic inverters in parallel connection, N photovoltaic inverters are selected by an upper computer to switch to a resonance damping function and are enabled to generate comprehensive instruction current according to resonance voltage and resonance current of the PCC and bus voltage thereof, so as to carry out tracking compensation on resonance current of a power grid, thereby realizing suppression of the resonance vibrations; and other M-N photovoltaic inverters are still at a normal grid connection working state, thereby ensuring normal operation of photovoltaic grid connection. The resonance damping method of the photovoltaic inverters requires no extra active power filter (APF) devices, saves cost of photovoltaic power stations, and does not cause resource wastes when the resonance vibrations do not occur, thereby solving the problem of parallel resonance suppression at the cost of cost increase and resource wastes.
Description
Technical field
The present invention relates to photovoltaic DC-to-AC converter resonance suppression technology field, particularly relate to a kind of photovoltaic inverting system, photovoltaic DC-to-AC converter and resonance suppressing method thereof and device.
Background technology
Along with the continuous increase of photovoltaic generation capacity, for increasing reliability and the extensibility of system, often M platform inverter is adopted the transformers connected in parallel pattern access operation of power networks without isolation, the network equivalence impedance easily causing separate unit combining inverter in photovoltaic power station system to bear increases gradually, and the reciprocation of electric network impedance and photovoltaic power station system may cause grid-connected current that resonance occurs under some characteristic frequency, make grid-connected current Severe distortion, worsen and export the quality of power supply, even affect the stability that whole photovoltaic power station system runs, power station is caused to quit work time serious, combining inverter damages.
A kind of method adopted in prior art is: at described point of common coupling APF (Active power filter in parallel, Active Power Filter-APF), when detecting the harmonic voltage at point of common coupling place (M platform photovoltaic DC-to-AC converter parallel coupled exports the point in parallel of electrical network to), apply suitable resonance Restrainable algorithms, electric network impedance information is introduced control system, now APF can be equivalent to the virtual harmonic impedance of the grid side being parallel to power station, change the impedance operator of transmission system, realize resonance to suppress, new resonance point can not be increased, achieve the dual-use function of harmonic wave control and resonance suppression.
But in prior art, the method requires that each photovoltaic plant must be equipped with an even multiple stage APF device according to station capacity, adds the cost of photovoltaic plant, and when resonance does not occur in power station, causes again the waste of resource.
Summary of the invention
In view of this, the invention provides a kind of photovoltaic inverting system, photovoltaic DC-to-AC converter and resonance suppressing method thereof and device, to solve in prior art to increase cost and to waste the problem that resource is cost suppression parallel resonance.
A resonance suppressing method for photovoltaic DC-to-AC converter, be applied to the host computer be connected with the photovoltaic DC-to-AC converter of M platform parallel connection, the resonance suppressing method of described photovoltaic DC-to-AC converter comprises:
When the point of common coupling generation resonance of the photovoltaic DC-to-AC converter of described M platform parallel connection, choose N platform photovoltaic DC-to-AC converter and switch to resonance inhibit feature, make described N platform photovoltaic DC-to-AC converter according to the resonance potential at described point of common coupling place, resonance current and its busbar voltage, generate comprehensive directive electric current, tracing compensation is carried out to the harmonic current of electrical network; Wherein, M and N is the natural number being greater than 1, and N is less than M.
Preferably, described comprehensive directive electric current comprises:
For maintaining the first stable electric current of described busbar voltage;
For eliminating the second electric current of described resonance potential.
Preferably, choose described in before N platform photovoltaic DC-to-AC converter switches to the step of resonance inhibit feature and also comprise:
The photovoltaic DC-to-AC converter of described M platform parallel connection detects the resonance potential at described point of common coupling place;
The photovoltaic DC-to-AC converter of described M platform parallel connection judges whether described resonance potential exceedes preset value, if described resonance potential exceedes described preset value, then judges described point of common coupling generation resonance.
A resonance restraining device for photovoltaic DC-to-AC converter, be applied to the host computer be connected with the photovoltaic DC-to-AC converter of M platform parallel connection, the resonance restraining device of described photovoltaic DC-to-AC converter comprises:
Choose unit, during point of common coupling generation resonance for the photovoltaic DC-to-AC converter when the parallel connection of described M platform, choose N platform photovoltaic DC-to-AC converter and switch to resonance inhibit feature, make described N platform photovoltaic DC-to-AC converter according to the resonance potential at described point of common coupling place, resonance current and its busbar voltage, generate comprehensive directive electric current, tracing compensation is carried out to the harmonic current of electrical network; Wherein, M and N is the natural number being greater than 1, and N is less than M.
Preferably, also comprise:
With the described receiving element chosen unit and be connected, for when the photovoltaic DC-to-AC converter of described M platform parallel connection judges that described resonance potential exceedes preset value, receive the information of the described point of common coupling generation resonance that described M platform photovoltaic DC-to-AC converter exports.
A kind of photovoltaic DC-to-AC converter, described photovoltaic DC-to-AC converter comprises:
Sampling module, the resonance potential at the described point of common coupling place that samples, resonance current and its busbar voltage;
The resonance suppression module be connected with described sampling module, during point of common coupling generation resonance for the photovoltaic DC-to-AC converter when the parallel connection of M platform, generate comprehensive directive electric current according to described resonance potential, described resonance current and described busbar voltage, tracing compensation is carried out to the harmonic current of electrical network.
Preferably, also comprise:
Judging unit, for judging whether described resonance potential exceedes preset value, if described resonance potential exceedes described preset value, then judges described point of common coupling generation resonance.
A kind of photovoltaic inverting system, the photovoltaic DC-to-AC converter of M platform parallel connection comprising host computer and be connected with described host computer;
When the point of common coupling generation resonance of the photovoltaic DC-to-AC converter of described M platform parallel connection, N platform photovoltaic DC-to-AC converter is switched to resonance inhibit feature by described host computer; Wherein, M and N is the natural number being greater than 1, and N is less than M;
Described N platform photovoltaic DC-to-AC converter generates comprehensive directive electric current according to the resonance potential of described point of common coupling, described resonance current and described busbar voltage, carries out tracing compensation to the harmonic current of electrical network.
Preferably, described photovoltaic DC-to-AC converter also comprises: the judging unit be connected with described receiving element, for judging whether described resonance potential exceedes preset value, if described resonance potential exceedes described preset value, then judges described point of common coupling generation resonance;
Described host computer also comprises: with the described receiving element chosen unit and be connected, for when the photovoltaic DC-to-AC converter of described M platform parallel connection judges that described resonance potential exceedes preset value, receive the information of the point of common coupling generation resonance of the photovoltaic DC-to-AC converter of the described M platform parallel connection that described M platform photovoltaic DC-to-AC converter exports.
The resonance suppressing method of photovoltaic DC-to-AC converter disclosed by the invention, when the point of common coupling generation resonance of the photovoltaic DC-to-AC converter of M platform parallel connection, choose N platform photovoltaic DC-to-AC converter by host computer and switch to resonance inhibit feature, make described N platform photovoltaic DC-to-AC converter according to the resonance potential at described point of common coupling place, resonance current and its busbar voltage, generate comprehensive directive electric current, tracing compensation is carried out to the harmonic current of electrical network, to realize the suppression to described resonance; Other M-N platform photovoltaic DC-to-AC converters are still in normal grid-connected operating state, ensure grid-connected normally carrying out.The resonance suppressing method of described photovoltaic DC-to-AC converter is without the need to extra APF device, save the cost of photovoltaic plant, when there is not resonance, also can not cause the waste of resource, solving prior art to increase cost and to waste resource is the problem that cost suppresses parallel resonance.
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 or description of the prior art 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, other accompanying drawing can also be obtained according to these accompanying drawings.
The resonance suppressing method flow chart of Fig. 1 photovoltaic DC-to-AC converter disclosed in the embodiment of the present invention;
Fig. 2 is the resonance suppressing method flow chart of another embodiment of the present invention another photovoltaic DC-to-AC converter disclosed;
Fig. 3 is photovoltaic DC-to-AC converter parallel-connection structure schematic diagram disclosed in another embodiment of the present invention;
The resonance restraining device structural representation of Fig. 4 photovoltaic DC-to-AC converter disclosed in another embodiment of the present invention;
The structural representation of Fig. 5 photovoltaic DC-to-AC converter disclosed in another embodiment of the present invention;
Fig. 6 is photovoltaic DC-to-AC converter structural representation disclosed in another embodiment of the present invention;
Fig. 7 is photovoltaic inverting system schematic diagram disclosed in another embodiment of the present invention;
Fig. 8 is photovoltaic inverting system structural representation disclosed in another embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of resonance suppressing method of photovoltaic DC-to-AC converter, be applied to the host computer be connected with the photovoltaic DC-to-AC converter of M platform parallel connection, to solve in prior art to increase cost and to waste the problem that resource is cost suppression parallel resonance.
Concrete, as shown in Figure 1, the resonance suppressing method of photovoltaic DC-to-AC converter comprises:
S101, when the point of common coupling generation resonance of the photovoltaic DC-to-AC converter of described M platform parallel connection, choose N platform photovoltaic DC-to-AC converter and switch to resonance inhibit feature, make described N platform photovoltaic DC-to-AC converter according to the resonance potential at described point of common coupling place, resonance current and its busbar voltage, generate comprehensive directive electric current, tracing compensation is carried out to the harmonic current of electrical network.
Described busbar voltage specifically refers to the busbar voltage of every platform photovoltaic DC-to-AC converter.The described resonance potential at described point of common coupling place, described resonance current and described busbar voltage can obtain for described photovoltaic DC-to-AC converter detects sampling in real time, are not specifically limited herein.
Wherein, M and N is the natural number being greater than 1, and N is less than M, as long as ensure when there is resonance, part photovoltaic DC-to-AC converter carries out the resonance suppression work of above-mentioned steps, another part photovoltaic DC-to-AC converter continues normally to work, and its concrete value depending on its embody rule environment, can be not specifically limited herein.
The resonance suppressing method of described photovoltaic DC-to-AC converter disclosed in the present embodiment, by above-mentioned steps, realizes the suppression to described resonance; Other M-N platform photovoltaic DC-to-AC converters are still in normal grid-connected operating state, ensure grid-connected normally carrying out.The resonance suppressing method of described photovoltaic DC-to-AC converter is without the need to extra APF device, save the cost of photovoltaic plant, when there is not resonance, also can not cause the waste of resource, solving prior art to increase cost and to waste resource is the problem that cost suppresses parallel resonance.
What deserves to be explained is, when resonance does not occur for the point of common coupling of the photovoltaic DC-to-AC converter judging the parallel connection of described M platform or after resonance eliminates, described in described PC control, the photovoltaic DC-to-AC converter of M platform parallel connection all works in normal grid-connect mode; Like this then the resonance suppressing method of described photovoltaic DC-to-AC converter can suppress when described M platform photovoltaic DC-to-AC converter parallel connection produces resonance, again can when there is not resonance, make photovoltaic DC-to-AC converter normally grid-connected, while this kind of method suppresses multi-machine parallel connection resonance problems, both saved power station cost, the waste of resource can not have been caused again.
Preferably, described comprehensive directive electric current comprises:
For maintaining the first stable electric current of described busbar voltage;
For eliminating the second electric current of described resonance potential.
N platform photovoltaic DC-to-AC converter described in described PC control is by the process to described resonance potential, described resonance current and described busbar voltage, generate for maintaining the first stable electric current of described busbar voltage and the second electric current for eliminating described resonance potential, reach the object suppressing resonance, ensure that the normal operation of photovoltaic plant when there is resonance, solving the impact that photovoltaic plant causes because of inverter multi-machine parallel connection resonance; Also save certain cost compared to existing technology simultaneously.
Preferably, as shown in Figure 2, also comprised before step S101:
The photovoltaic DC-to-AC converter of S201, the parallel connection of described M platform detects the resonance potential at described point of common coupling place;
The photovoltaic DC-to-AC converter of S202, the parallel connection of described M platform judges whether described resonance potential exceedes preset value, if described resonance potential exceedes described preset value, then judges described point of common coupling generation resonance.
The photovoltaic DC-to-AC converter of described M platform parallel connection detects the resonance potential at described point of common coupling place always in real time, and performs corresponding deterministic process after sensing.
Described preset value can the application demand concrete according to it set, and can be a concrete value, also can be a span.
Another embodiment of the present invention additionally provides a kind of resonance restraining device of photovoltaic DC-to-AC converter, is applied to the host computer be connected with the photovoltaic DC-to-AC converter of M platform parallel connection, and the annexation of the photovoltaic DC-to-AC converter of described M platform parallel connection as shown in Figure 3, all adopts LCL filtering.The resonance restraining device of described photovoltaic DC-to-AC converter comprises: choose unit, and concrete operation principle is:
When the point of common coupling generation resonance of the photovoltaic DC-to-AC converter of described M platform parallel connection, described in choose unit selection N platform photovoltaic DC-to-AC converter and switch to resonance inhibit feature, described N platform photovoltaic DC-to-AC converter is sampled and according to the resonance potential V of point of common coupling place PCC
pCC, resonance current i
labcwith busbar voltage V
dc, generate comprehensive directive electric current, tracing compensation carried out to the harmonic current of electrical network; Wherein, M and N is the natural number being greater than 1, and N is less than M.
Preferably, described comprehensive directive electric current comprises:
For maintaining busbar voltage V
dcthe first stable electric current;
For eliminating resonance potential V
pCCthe second electric current.
Each photovoltaic DC-to-AC converter in described N platform photovoltaic DC-to-AC converter is respectively by resonance potential V
pCC, resonance current i
labcwith busbar voltage V
dcprocess, all generate for maintaining busbar voltage V
dcthe first stable electric current and for eliminating resonance potential V
pCCthe second electric current, reach and suppress the object of resonance, ensure that the normal operation of photovoltaic plant when there is resonance, solving the impact that photovoltaic plant causes because of inverter multi-machine parallel connection resonance; Also save certain cost compared to existing technology simultaneously.
Preferably, the resonance restraining device of described photovoltaic DC-to-AC converter comprises as shown in Figure 4:
Choose unit 101;
With the receiving element 102 chosen unit 101 and be connected.
Receiving element 102, when the photovoltaic DC-to-AC converter of described M platform parallel connection judges that described resonance potential exceedes preset value, receives the information of the described point of common coupling generation resonance that described M platform photovoltaic DC-to-AC converter exports.
Then choose N platform photovoltaic DC-to-AC converter switch to resonance inhibit feature by choosing unit 101.
This example demonstrates a kind of process determining the point of common coupling generation resonance of the photovoltaic DC-to-AC converter of described M platform parallel connection, then host computer can be chosen N platform photovoltaic DC-to-AC converter and switch to resonance inhibit feature, residue M-N platform photovoltaic DC-to-AC converter is in normal grid-connected operating state, ensures grid-connected normally carrying out.
Another embodiment of the present invention additionally provides a kind of photovoltaic DC-to-AC converter, is connected with host computer, and described photovoltaic DC-to-AC converter as shown in Figure 5, comprising:
Sampling module 201;
The resonance suppression module 202 be connected with sampling module 201.
Sampling module 201 is for the resonance potential at the described point of common coupling place that samples, resonance current and its busbar voltage; The real-time sampling that the sampling work of sampling module 201 can carry out for the control according to host computer 301;
During the point of common coupling generation resonance of resonance suppression module 202 for the photovoltaic DC-to-AC converter when the parallel connection of M platform, generate comprehensive directive electric current according to described resonance potential, described resonance current and described busbar voltage, tracing compensation is carried out to the harmonic current of electrical network.
Described photovoltaic DC-to-AC converter as shown in Figure 5, coordinates the resonance restraining device of the photovoltaic DC-to-AC converter of above-described embodiment, by said process, realizes the suppression to described resonance; Without the need to extra APF device, having saved the cost of photovoltaic plant, when there is not resonance, also can not cause the waste of resource, solving prior art to increase cost and to waste resource is the problem that cost suppresses parallel resonance.
Preferably, as shown in Figure 6, judging unit 203 is also comprised.
Now, judging unit 203 judges whether described resonance potential exceedes preset value, if described resonance potential exceedes described preset value, then judges described point of common coupling generation resonance.
Another embodiment of the present invention additionally provides a kind of photovoltaic inverting system, as shown in Figure 7, and the photovoltaic DC-to-AC converter 302 of M platform parallel connection comprising host computer 301 and be connected with host computer 301;
Host computer 301 comprises: choose unit 101.
Photovoltaic DC-to-AC converter 302 comprises:
With the sampling module 201 chosen unit 101 and be connected;
And the resonance suppression module 202 to be connected with sampling module 201.
Concrete operation principle is:
When the point of common coupling generation resonance of the photovoltaic DC-to-AC converter of described M platform parallel connection, choose unit 101 and choose N platform photovoltaic DC-to-AC converter 302 and switch to resonance inhibit feature; Sampling module 201 is sampled the resonance potential at described point of common coupling place, resonance current and its busbar voltage; Wherein, M and N is the natural number being greater than 1, and N is less than M; Resonance suppression module 202, when the point of common coupling generation resonance of the photovoltaic DC-to-AC converter of M platform parallel connection, generates comprehensive directive electric current according to described resonance potential, described resonance current and described busbar voltage, carries out tracing compensation to the harmonic current of electrical network.
Described photovoltaic inverting system disclosed in the present embodiment, chooses N platform photovoltaic DC-to-AC converter 302 by host computer 301 and switches to resonance inhibit feature, realize the suppression to described resonance; Other M-N platform photovoltaic DC-to-AC converters 302 are still in normal grid-connected operating state, ensure grid-connected normally carrying out.Described photovoltaic inverting system, without the need to extra APF device, has saved the cost of photovoltaic plant, when there is not resonance, also can not cause the waste of resource, and solving prior art to increase cost and to waste resource is the problem that cost suppresses parallel resonance.
What deserves to be explained is, when judging that resonance does not occur the photovoltaic DC-to-AC converter 302 of M platform parallel connection, the photovoltaic DC-to-AC converter 302 of host computer 301 control M platform parallel connection all works in normal grid-connect mode; Like this then described photovoltaic inverting system can suppress when the parallel connection of M platform photovoltaic DC-to-AC converter 302 produces resonance, can, when there is not resonance, make photovoltaic DC-to-AC converter 302 normally grid-connected again, while suppressing multi-machine parallel connection resonance problems, namely save power station cost, the waste of resource can not be caused again.
Preferably, as shown in Figure 8, photovoltaic DC-to-AC converter 302 also comprises: the judging unit 203 be connected with receiving element 102;
Host computer 301 also comprises: with the receiving element 102 chosen unit 101 and be connected;
Concrete operation principle is same as the previously described embodiments, repeats no more herein.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. a resonance suppressing method for photovoltaic DC-to-AC converter, is characterized in that, be applied to the host computer be connected with the photovoltaic DC-to-AC converter of M platform parallel connection, the resonance suppressing method of described photovoltaic DC-to-AC converter comprises:
When the point of common coupling generation resonance of the photovoltaic DC-to-AC converter of described M platform parallel connection, choose N platform photovoltaic DC-to-AC converter and switch to resonance inhibit feature, make described N platform photovoltaic DC-to-AC converter according to the resonance potential at described point of common coupling place, resonance current and its busbar voltage, generate comprehensive directive electric current, tracing compensation is carried out to the harmonic current of electrical network; Wherein, M and N is the natural number being greater than 1, and N is less than M.
2. the resonance suppressing method of photovoltaic DC-to-AC converter according to claim 1, is characterized in that, described comprehensive directive electric current comprises:
For maintaining the first stable electric current of described busbar voltage;
For eliminating the second electric current of described resonance potential.
3. the resonance suppressing method of photovoltaic DC-to-AC converter according to claim 1, is characterized in that, described in choose before N platform photovoltaic DC-to-AC converter switches to the step of resonance inhibit feature and also comprise:
The photovoltaic DC-to-AC converter of described M platform parallel connection detects the resonance potential at described point of common coupling place;
The photovoltaic DC-to-AC converter of described M platform parallel connection judges whether described resonance potential exceedes preset value, if described resonance potential exceedes described preset value, then judges described point of common coupling generation resonance.
4. a resonance restraining device for photovoltaic DC-to-AC converter, is characterized in that, be applied to the host computer be connected with the photovoltaic DC-to-AC converter of M platform parallel connection, the resonance restraining device of described photovoltaic DC-to-AC converter comprises:
Choose unit, during point of common coupling generation resonance for the photovoltaic DC-to-AC converter when the parallel connection of described M platform, choose N platform photovoltaic DC-to-AC converter and switch to resonance inhibit feature, make described N platform photovoltaic DC-to-AC converter according to the resonance potential at described point of common coupling place, resonance current and its busbar voltage, generate comprehensive directive electric current, tracing compensation is carried out to the harmonic current of electrical network; Wherein, M and N is the natural number being greater than 1, and N is less than M.
5. the resonance restraining device of photovoltaic DC-to-AC converter according to claim 4, is characterized in that, also comprise:
With the described receiving element chosen unit and be connected, for when the photovoltaic DC-to-AC converter of described M platform parallel connection judges that described resonance potential exceedes preset value, receive the information of the described point of common coupling generation resonance that described M platform photovoltaic DC-to-AC converter exports.
6. a photovoltaic DC-to-AC converter, is characterized in that, described photovoltaic DC-to-AC converter comprises:
Sampling module, the resonance potential at the described point of common coupling place that samples, resonance current and its busbar voltage;
The resonance suppression module be connected with described sampling module, during point of common coupling generation resonance for the photovoltaic DC-to-AC converter when the parallel connection of M platform, generate comprehensive directive electric current according to described resonance potential, described resonance current and described busbar voltage, tracing compensation is carried out to the harmonic current of electrical network.
7. photovoltaic DC-to-AC converter according to claim 6, is characterized in that, also comprises:
Judging unit, for judging whether described resonance potential exceedes preset value, if described resonance potential exceedes described preset value, then judges described point of common coupling generation resonance.
8. a photovoltaic inverting system, is characterized in that, the photovoltaic DC-to-AC converter of M platform parallel connection comprising host computer and be connected with described host computer;
When the point of common coupling generation resonance of the photovoltaic DC-to-AC converter of described M platform parallel connection, N platform photovoltaic DC-to-AC converter is switched to resonance inhibit feature by described host computer; Wherein, M and N is the natural number being greater than 1, and N is less than M;
Described N platform photovoltaic DC-to-AC converter generates comprehensive directive electric current according to the resonance potential of described point of common coupling, resonance current and its busbar voltage, carries out tracing compensation to the harmonic current of electrical network.
9. photovoltaic inverting system according to claim 8, it is characterized in that, described photovoltaic DC-to-AC converter also comprises: the judging unit be connected with described receiving element, for judging whether described resonance potential exceedes preset value, if described resonance potential exceedes described preset value, then judge described point of common coupling generation resonance;
Described host computer also comprises: with the described receiving element chosen unit and be connected, for when the photovoltaic DC-to-AC converter of described M platform parallel connection judges that described resonance potential exceedes preset value, receive the information of the point of common coupling generation resonance of the photovoltaic DC-to-AC converter of the described M platform parallel connection that described M platform photovoltaic DC-to-AC converter exports.
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| WO2019206289A1 (en) * | 2018-04-28 | 2019-10-31 | 华为技术有限公司 | Inverter, power generation system, and method for inhibiting the distortion of harmonic waves |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023060A (en) * | 2012-09-14 | 2013-04-03 | 深圳市汇川技术股份有限公司 | Photovoltaic inverter and harmonic suppression method |
| CN103095165A (en) * | 2013-01-16 | 2013-05-08 | 武汉新能源接入装备与技术研究院有限公司 | Three-phase inverter parallel-connection control method without output isolation transformer |
| CN103490653A (en) * | 2013-09-25 | 2014-01-01 | 国网河南省电力公司南阳供电公司 | Secondary ripple reduction control system and control method for photovoltaic grid-connected currents and direct current voltage |
| CN103904681A (en) * | 2014-03-11 | 2014-07-02 | 西安理工大学 | High-power centralized type grid-connected photovoltaic power generation coordinated control system and method |
-
2015
- 2015-06-25 CN CN201510357638.5A patent/CN104901568B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023060A (en) * | 2012-09-14 | 2013-04-03 | 深圳市汇川技术股份有限公司 | Photovoltaic inverter and harmonic suppression method |
| CN103095165A (en) * | 2013-01-16 | 2013-05-08 | 武汉新能源接入装备与技术研究院有限公司 | Three-phase inverter parallel-connection control method without output isolation transformer |
| CN103490653A (en) * | 2013-09-25 | 2014-01-01 | 国网河南省电力公司南阳供电公司 | Secondary ripple reduction control system and control method for photovoltaic grid-connected currents and direct current voltage |
| CN103904681A (en) * | 2014-03-11 | 2014-07-02 | 西安理工大学 | High-power centralized type grid-connected photovoltaic power generation coordinated control system and method |
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| WO2019206289A1 (en) * | 2018-04-28 | 2019-10-31 | 华为技术有限公司 | Inverter, power generation system, and method for inhibiting the distortion of harmonic waves |
| CN110417016A (en) * | 2018-04-28 | 2019-11-05 | 华为技术有限公司 | Inverter, electricity generation system and the method for inhibiting AC system harmonic distortion |
| US11336094B2 (en) | 2018-04-28 | 2022-05-17 | Huawei Technologies Co., Ltd. | Inverter, power generating system, and method for suppressing harmonic distortion of alternating current system |
| CN110417016B (en) * | 2018-04-28 | 2023-06-06 | 华为技术有限公司 | Inverter, power generation system and method for inhibiting harmonic distortion of alternating current system |
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