CN106385235B - Present site detection device reversal connection detection method and reversal connection detection device - Google Patents
Present site detection device reversal connection detection method and reversal connection detection device Download PDFInfo
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- CN106385235B CN106385235B CN201610829673.7A CN201610829673A CN106385235B CN 106385235 B CN106385235 B CN 106385235B CN 201610829673 A CN201610829673 A CN 201610829673A CN 106385235 B CN106385235 B CN 106385235B
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- 238000001514 detection method Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000001960 triggered effect Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000013082 photovoltaic technology Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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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
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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
This application discloses feedback site detection device reversal connection detection methods and detection device, this method to include：Obtain the feedback site power that feedback site detection device to be measured measures；Obtain photovoltaic DC-to-AC converter output power；The difference of the feedback site power and the photovoltaic DC-to-AC converter output power is calculated；Judge whether to meet the first preset condition, first preset condition includes at least the difference and is more than given threshold；If satisfied, the indication signal of the feedback site detection device reversal connection to be measured is generated and exports, to realize the automatic detection of feedback site detection device reversal connection failure.
Description
Technical field
The present invention relates to photovoltaic technology field, more specifically to feedback site detection device reversal connection detection method and instead
Connect detection device.
Background technology
In residents photovoltaic system, the energy management tune of generating power for their own use of zero feedback net limit power functions of operation and energy-storage system
Degree is required to use feedback site detection device (such as ammeter) and the power for presenting site is detected, so feedback site detection device
Installation reliability directly determine that can the above-mentioned function of this system normal operation.
But in the installation process of feedback site detection device, due to system complexity in itself and the peace of indivedual electricians
Dress error, inevitably will appear the situation of feedback site detection device input/output reverse connection, so as to cause after-sales service cost
Increase.
Invention content
In view of this, the present invention provides feedback site detection device reversal connection detection method and reversal connection detection device, to realize feedback
The automatic detection of site detection device reversal connection failure.
A kind of feedback site detection device reversal connection detection method, including：
Obtain the feedback site power that feedback site detection device to be measured measures；
Obtain photovoltaic DC-to-AC converter output power；
The difference of the feedback site power and the photovoltaic DC-to-AC converter output power is calculated；
Judge whether to meet the first preset condition, wherein, first preset condition is more than including at least the difference to be set
Determine threshold value；
If satisfied, generate and export the indication signal of the feedback site detection device reversal connection to be measured.
Optionally, first preset condition further includes：The difference is more than continuing for this state of given threshold
Time reaches the first setting duration.
Optionally, it after the acquisition photovoltaic DC-to-AC converter output power, further includes：
Judge whether the photovoltaic DC-to-AC converter output power is zero；
If not zero, the difference of the feedback site power and the photovoltaic DC-to-AC converter output power is calculated described in execution
The step of；
If zero, judge whether to meet the second preset condition, if satisfied, generating and exporting the detection dress in feedback site to be measured
The indication signal of reversal connection is put, wherein, second preset condition includes at least the feedback site power and is more than the given threshold.
Optionally, second preset condition further includes：The feedback site power is more than this state of the given threshold
Duration reach the second setting duration, wherein it is described second setting duration be less than described first setting duration.
A kind of feedback site detection device reversal connection detection device, including first acquisition unit, second acquisition unit, calculates list
Member, the first judging unit and output unit, wherein：
The first acquisition unit, for obtaining the feedback site power that feedback site detection device to be measured measures；
The second acquisition unit, for obtaining photovoltaic DC-to-AC converter output power；
The computing unit, for the difference of the feedback site power and the photovoltaic DC-to-AC converter output power to be calculated
Value；
First judging unit, for judging whether to meet the first preset condition, if satisfied, the triggering output is single
Member, wherein first preset condition, which includes at least the difference, is more than given threshold；
The output unit, for generating and exporting the indication signal of the feedback site detection device reversal connection to be measured.
Optionally, first preset condition further includes：The difference is more than continuing for this state of given threshold
Time reaches the first setting duration.
Optionally, described device further includes second judgment unit and third judging unit, wherein：
The second judgment unit, for judging whether the photovoltaic DC-to-AC converter output power is zero；If not zero, triggering
The computing unit；If zero, the third judging unit is triggered；
The third judging unit, for judging whether to meet the second preset condition, if satisfied, the triggering output is single
Member, wherein second preset condition, which includes at least the feedback site power, is more than the given threshold.
Optionally, second preset condition further includes：The feedback site power is more than this state of the given threshold
Duration reach the second setting duration, wherein it is described second setting duration be less than described first setting duration.
It can be seen from the above technical scheme that the power the present invention is based on load consumption can not possibly be the main think of of negative value
Think, be more than in the difference for detecting the obtained feedback site power of feedback site detection device measurement and photovoltaic DC-to-AC converter output power to be measured
During given threshold, it is determined as feedback site detection device reversal connection to be measured, so as to avoid because of feedback site detection device installation error institute
Caused after-sales service cost increases.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of feedback site detection device reversal connection detection method flow chart disclosed by the embodiments of the present invention；
Fig. 2 is schematic view of the mounting position of the feedback site detection device to be measured in residents photovoltaic system；
Fig. 3 is another feedback site detection device reversal connection detection method flow chart disclosed by the embodiments of the present invention；
Fig. 4 is a kind of feedback site detection device reversal connection structure of the detecting device schematic diagram disclosed by the embodiments of the present invention；
Fig. 5 is another feedback site detection device reversal connection structure of the detecting device schematic diagram disclosed by the embodiments of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution 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, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the embodiment of the invention discloses a kind of feedback site detection device reversal connection detection method, to realize feedback site
The automatic detection of detection device reversal connection failure, including：
Step S101：Obtain the feedback site power that feedback site detection device to be measured measures；
Step S102：Obtain photovoltaic DC-to-AC converter output power；
Step S103：The difference DELTA P of the feedback site power and the photovoltaic DC-to-AC converter output power is calculated；
Step S104：Judge whether to meet the first preset condition, wherein, first preset condition includes at least difference DELTA
P is more than given threshold Δ Plimit；If meeting first preset condition, S105 is entered step；If it is default to be unsatisfactory for described first
Condition, return to step S101；
Step S105：Generate and export the indication signal of the feedback site detection device reversal connection to be measured.
In the following, the operation principle to the present embodiment is described in detail.
In residents photovoltaic system, the direct current side joint photovoltaic battery panel and energy-storage system of photovoltaic DC-to-AC converter, photovoltaic inversion
The output side joint load of device and power grid, feedback site detection device are arranged close to the side of power grid, installation site such as Fig. 2 institutes
Show.
Definition feedback site power is Pexport, photovoltaic DC-to-AC converter output power be Pout, load consumption power be Pload, then
The P according to the principle of active power conservationout=Pout–Pexport.Again due to the power P of load consumptionoutCan not possibly be negative value,
Then according to relational expression Pout=Pout–PexportIt is found that feedback site power PexportNecessarily it is not more than photovoltaic DC-to-AC converter output power
Pout。
The feedback site power that definition feedback site detection device measures is P*, then presents site detection device own structural characteristics and determine
It is fixed, present site detection device measurement feedback site power P utilizingexportWhen, if feedback site detection device input/output reverse connection,
Then present feedback site power P * and the practical feedback site power P that site detection device measuresexportOpposite number each other.
It can be deduced based on the above：Theoretically, if the feedback site power P * that feedback site detection device measures is more than light
Lie prostrate inverter output power Pout, i.e. Δ P=P*-Pout＞ 0, then it can be determined that feedback site detection device reversal connection.
But in view of in actual application, the calculated value of Δ P can be by factors such as sampling error and asynchronous samplings
It influences, therefore the present embodiment is with Δ P>ΔPlimitAs the condition of judgement reversal connection failure, Δ PlimitSize according to practical application
It adjusts accordingly (by Δ P such as under certain practical application scenelimitIt is set as 300W), to avoid erroneous judgement.
In summary description it is found that power of the present embodiment based on load consumption can not possibly for negative value main thought,
It detects that the difference of the obtained feedback site power of feedback site detection device measurement to be measured and photovoltaic DC-to-AC converter output power is more than to set
During threshold value, it is determined as feedback site detection device reversal connection to be measured, so as to avoid caused by feedback site detection device installation error
After-sales service cost increase.
Optionally, first preset condition further includes：ΔP>ΔPlimitThe duration of this state reaches first and sets
Timing is long.The purpose for the arrangement is that：Since power flow variation is frequent during photovoltaic inverter grid-connected generator operation, if only
With it is a certain when the instantaneous value Δ P that inscribes and Δ PlimitIt makes comparisons to determine whether reversal connection, in fact it could happen that erroneous judgement；Therefore the present embodiment
Recommend with Δ P>ΔPlimitAnd the duration reaches condition of the first setting duration as judgement reversal connection, i.e., with one section of continuous time
The interior multiple instantaneous value Δ P being calculated that connect are both greater than Δ PlimitAs the condition of judgement reversal connection, so as to avoid judging by accident.This section
The length of continuous time, that is, the size of the first setting duration are preset by staff according to actual condition.
Referring to Fig. 3, the embodiment of the invention discloses another to present site detection device reversal connection detection method, including：
Step S101：Obtain the feedback site power that feedback site detection device to be measured measures；
Step S102：Obtain photovoltaic DC-to-AC converter output power；
Step S1021：Judge whether the photovoltaic DC-to-AC converter output power is zero；If not zero, enter step S103；If
It is zero, enters step S1022；
Step S1022：Judge whether to meet the second preset condition, if satisfied, entering step S105；If not satisfied, it returns
Step S101；
Wherein, second preset condition includes at least the feedback site power more than the given threshold Δ Plimit；It can
Selection of land, second preset condition further include the feedback site power and are reached more than the duration of this state of given threshold
To the second setting duration, wherein the second setting duration is less than the described first setting duration；
Step S103：The difference DELTA P of the feedback site power and the photovoltaic DC-to-AC converter output power is calculated；Into
Step S104；
Step S104：Judge whether to meet the first preset condition, if satisfied, entering step S105；If not satisfied, return to step
Rapid S101；Wherein, first preset condition includes at least difference DELTA P more than given threshold Δ Plimit；
Step S105：Generate and export the indication signal of the feedback site detection device reversal connection to be measured.
Compared with scheme shown in Fig. 3, difference part is to have increased step S1021, S1022 newly the present embodiment.It does so
Purpose is：Compared with when photovoltaic inverter grid-connected generator operation, photovoltaic DC-to-AC converter initial power-on (can be from off-mode to simultaneously
Net generator operation state switches or is switched from standby mode to operating status of generating electricity by way of merging two or more grid systems) when, there is not power output,
Step S103 need not be performed under this operating mode, and power flow change frequency is relatively low in system under this operating mode, therefore by surveying
The feedback site power P * measured and Δ PlimitNumerical value is carried out relatively come when determining whether to occur reversal connection failure, to avoid erroneous judgement
Continue the time compared without the too long of setting, so the present embodiment will need the duration for continuing to judge in advance under this operating mode,
Exactly described first setting duration sets smaller, usually several seconds.
Referring to Fig. 4, the embodiment of the invention discloses a kind of feedback site detection device reversal connection detection devices, are obtained including first
Unit 101, second acquisition unit 102, computing unit 103, the first judging unit 104 and output unit 105, wherein：
First acquisition unit 101, for obtaining the feedback site power that feedback site detection device to be measured measures；
Second acquisition unit 102, for obtaining photovoltaic DC-to-AC converter output power；
Computing unit 103, for the difference of the feedback site power and the photovoltaic DC-to-AC converter output power to be calculated；
First judging unit 104, for judging whether to meet the first preset condition, if satisfied, triggering output unit 105,
Wherein described first preset condition includes at least the difference and is more than given threshold；
Output unit 105, for generating and exporting the indication signal of the feedback site detection device reversal connection to be measured.
Optionally, first preset condition further includes：The difference is more than continuing for this state of given threshold
Time reaches the first setting duration.
Optionally, referring to Fig. 5, the feedback site detection device reversal connection detection device further includes 106 He of second judgment unit
Third judging unit 107, wherein：
Second judgment unit 106, for judging whether the photovoltaic DC-to-AC converter output power is zero；If not zero, triggering
Computing unit 103；If zero, third judging unit 107 is triggered；
Third judging unit 107, for judging whether to meet the second preset condition, if satisfied, triggering output unit 105,
Wherein described second preset condition includes at least the feedback site power and is more than the given threshold.
Optionally, second preset condition further includes：The feedback site power is more than this state of the given threshold
Duration reach the second setting duration, wherein it is described second setting duration be less than described first setting duration.
In conclusion the power the present invention is based on load consumption can not possibly be the main thought of negative value, it is to be measured detecting
When the feedback site power and the difference of photovoltaic DC-to-AC converter output power that feedback site detection device measurement obtains are more than given threshold, judgement
For it is to be measured feedback site detection device reversal connection, so as to avoid because feedback site detection device installation error caused by after-sales service into
This increase.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related part is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications of these embodiments will be apparent for those skilled in the art, it is as defined herein
General Principle can in other embodiments be realized in the case where not departing from the spirit or scope of the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent most wide range of features of novelty.
Claims (8)
1. a kind of feedback site detection device reversal connection detection method, which is characterized in that including：
Obtain the feedback site power that feedback site detection device to be measured measures；
Obtain photovoltaic DC-to-AC converter output power；
The difference of the feedback site power and the photovoltaic DC-to-AC converter output power is calculated；
Judge whether to meet the first preset condition, wherein, first preset condition includes at least the difference and is more than setting threshold
Value；
If satisfied, generate and export the indication signal of the feedback site detection device reversal connection to be measured.
2. according to the method described in claim 1, it is characterized in that, first preset condition further includes：The difference is more than
The duration of this state of given threshold reaches the first setting duration.
3. according to the method described in claim 2, it is characterized in that, after the acquisition photovoltaic DC-to-AC converter output power, also wrap
It includes：
Judge whether the photovoltaic DC-to-AC converter output power is zero；
If not zero, the feedback site power and the step of the difference of the photovoltaic DC-to-AC converter output power are calculated described in execution
Suddenly；
If zero, judge whether to meet the second preset condition, if satisfied, generate and exporting that described to be measured to present site detection device anti-
The indication signal connect, wherein, second preset condition includes at least the feedback site power and is more than the given threshold.
4. according to the method described in claim 3, it is characterized in that, second preset condition further includes：The feedback site work(
The duration that rate is more than this state of given threshold reaches the second setting duration, wherein the second setting duration is less than
The first setting duration.
5. a kind of feedback site detection device reversal connection detection device, which is characterized in that obtained including first acquisition unit, second single
Member, computing unit, the first judging unit and output unit, wherein：
The first acquisition unit, for obtaining the feedback site power that feedback site detection device to be measured measures；
The second acquisition unit, for obtaining photovoltaic DC-to-AC converter output power；
The computing unit, for the difference of the feedback site power and the photovoltaic DC-to-AC converter output power to be calculated；
First judging unit, for judging whether to meet the first preset condition, if satisfied, the output unit is triggered,
Described in the first preset condition include at least the difference be more than given threshold；
The output unit, for generating and exporting the indication signal of the feedback site detection device reversal connection to be measured.
6. device according to claim 5, which is characterized in that first preset condition further includes：The difference is more than
The duration of this state of given threshold reaches the first setting duration.
7. device according to claim 6, which is characterized in that described device further includes second judgment unit and third judges
Unit, wherein：
The second judgment unit, for judging whether the photovoltaic DC-to-AC converter output power is zero；If not zero, described in triggering
Computing unit；If zero, the third judging unit is triggered；
The third judging unit, for judging whether to meet the second preset condition, if satisfied, the output unit is triggered,
Described in the second preset condition include at least it is described feedback site power be more than the given threshold.
8. device according to claim 7, which is characterized in that second preset condition further includes：The feedback site work(
The duration that rate is more than this state of given threshold reaches the second setting duration, wherein the second setting duration is less than
The first setting duration.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610829673.7A CN106385235B (en) | 2016-09-18 | 2016-09-18 | Present site detection device reversal connection detection method and reversal connection detection device |
| AU2017202814A AU2017202814B2 (en) | 2016-09-18 | 2017-04-28 | Method and device for detecting reverse connection of feed-point detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610829673.7A CN106385235B (en) | 2016-09-18 | 2016-09-18 | Present site detection device reversal connection detection method and reversal connection detection device |
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| CN106385235B true CN106385235B (en) | 2018-07-03 |
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| CN106877816B (en) * | 2017-03-31 | 2019-09-10 | 阳光电源（上海）有限公司 | A kind of photovoltaic group string reversal connection detection method and device |
| CN107807305B (en) * | 2017-10-30 | 2020-07-07 | 阳光电源股份有限公司 | Component type inverter wiring detection method, device and system |
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| WO2009015331A1 (en) * | 2007-07-25 | 2009-01-29 | Trulite, Inc. | Apparatus, system, and method to manage the generation and use of hybrid electric power |
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| CN201838994U (en) * | 2010-06-18 | 2011-05-18 | 北京茨浮电气有限公司 | Input and output reverse protection device of frequency converter |
| CN102023273A (en) * | 2010-12-31 | 2011-04-20 | 常州天合光能有限公司 | Portable domestic photo voltaic power station performance tester |
| CN102157966A (en) * | 2011-04-12 | 2011-08-17 | 江西日普升太阳能光伏产业有限公司 | Intelligent photovoltaic controller with multiple functions |
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| AU2017202814A1 (en) | 2018-04-05 |
| AU2017202814B2 (en) | 2018-11-08 |
| CN106385235A (en) | 2017-02-08 |
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