CN105656083B - A kind of distributed photovoltaic power grid control method and device - Google Patents
A kind of distributed photovoltaic power grid control method and device Download PDFInfo
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- CN105656083B CN105656083B CN201610137512.1A CN201610137512A CN105656083B CN 105656083 B CN105656083 B CN 105656083B CN 201610137512 A CN201610137512 A CN 201610137512A CN 105656083 B CN105656083 B CN 105656083B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 89
- 238000007689 inspection Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 8
- 230000007812 deficiency Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
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- 208000014674 injury Diseases 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of distributed photovoltaic power grid control method and device, the wherein distributed photovoltaic power grid control method comprises the following steps：Start passive type detection；JudgeWhether 80% is more than；Work as judgementMore than 80%When, start active detection；Judge whetherOr Ut≤0.8U0；Work as judgementOr Ut≤0.8U0When, disconnect the connection of the distributed photovoltaic power and the power network.Thus two kinds of detection modes are organically combined, isolated island can not only be detected exactly, and reduce the interference to power network.
Description
Technical field
The present invention relates to technical field of electric power, and in particular to a kind of distributed photovoltaic power grid control method and device.
Background technology
Distributed (distributing) photo-voltaic power supply, feature are that sent electric energy is assigned directly to in electric loading, it is unnecessary or
The electric power of person's deficiency is adjusted by being coupled bulk power grid, and the exchange of electric power between bulk power grid is two-way, suitable for small-scale light
Photovoltaic generating system, usual city photovoltaic generating system in this way, the photovoltaic system particularly in Integration of building.Such as scheming
In traditional distributed photovoltaic system shown in 1, the electric energy of photo-voltaic power supply PV outputs is supplied to civilian load I after inverter1-In,
Dump energy is sent to power network after transformer, high-tension distributing line, and when the electric energy deficiency that photo-voltaic power supply PV is provided, load is from power network
Extract electric energy.
There is the defects of being referred to as island effect in the distributed photovoltaic system, i.e., when accident occurs in the somewhere of power network, to the greatest extent
The All other routes of pipe power network are already off, but are still connected to photo-voltaic power supply herein, and the electric energy of photo-voltaic power supply output still can flow to
Power network, it is possible to cause accident treatment personnel to get an electric shock, serious meeting causes personal injury.
Existing island effect detection technique mainly has two kinds, and one kind is passive type island effect detection method, and one kind is main
Dynamic formula island effect detection method.Passive type island detection method identifies that isolated island is imitated by monitoring the Parameters variations such as common point voltage
Answer, implementation is simple, and cost is relatively low, but check frequency is larger.Active island detection method applies to system necessarily disturbs
It is dynamic, island state is reflected the blind area for be recognized, substantially reducing isolated island detection by Parameters variation, but realize
Mode is complicated, easily produces harmful effect to the power network quality of power supply.
The content of the invention
Therefore, the technical problem to be solved in the present invention is to detect island effect how exactly and reduce to do power network
Disturb.
Therefore, the embodiments of the invention provide a kind of distributed photovoltaic power grid control method, in the distributed light
Lie prostrate and a grid-connection control device is set in the grid entry point of power supply, for passive type and/or active detection power network, wherein, the quilt
Dynamic formula detection includes：The phase voltage and phase current of detection power network simultaneously obtain impedance angleCompare the impedance angleWith it is default
Impedance angle threshold valueThe active detection includes:Resistive load is accessed into power network, the resistive load is the power network
4 times of impedance, compare the line voltage U before accessing the resistive load0With the power network electricity after the access resistive load
Press Ut；
The control method comprises the following steps：
Start passive type detection；
JudgeWhether it is more than
Work as judgementIt is more thanWhen, start active detection；
Judge whetherOr Ut≤0.8U0；
Work as judgementOr Ut≤0.8U0When, disconnect the connection of the distributed photovoltaic power and the power network.
Preferably, after starting active detection, passive type detection continues.
Preferably, the impedance angle threshold valueFor the arbitrary value in 80-100.
Preferably, the phase voltage and phase current for detecting the power network include：Phase voltage and phase are detected by Hall sensor
Electric current.
The embodiment of the present invention additionally provides a kind of distributed photovoltaic power grid control device, is arranged on the distributed light
In the grid entry point for lying prostrate power supply, including：
Passive type detection unit, for detecting the phase voltage of power network and phase current and obtaining impedance angleAnd compare resistance
Anti- angleWith default impedance angle threshold value
Active detection start unit, it is connected with the passive type detection unit, for when the passive type detection unit
DetectWhen, start active detection module；
Active detection unit, it is connected with the active detection start unit, for resistive load to be accessed into power network, than
Compared with the line voltage U before the access resistive load0With the line voltage U after the access resistive loadt, wherein, it is described
Resistive load is 4 times of the impedance of the power network；
Isolated island judging unit, it is connected with the active detection unit and the passive type detection unit, for when described
Passive type detection unit detectsOr when the active detection unit detects Ut≤0.8U0When, judge to occur
Isolated island, and disconnect the connection of the distributed photovoltaic power and the power network.
Preferably, the passive type detection unit is arranged to, and continues to transport after the active detection unit starting
OK.
Preferably, the impedance angle threshold valueFor the arbitrary value in 80-100.
Preferably, the passive type detection unit detects phase voltage and phase current by Hall sensor.
Distributed photovoltaic power grid control method and device of the embodiment of the present invention are relatively low, right by start-up cost first
Grid disturbance it is small passive type detection, detect it is considerable degree of disturbance (It is more than) when, restarting more accurately has
Imitate but dysgenic active detection easily is produced to the power network quality of power supply, so as to organically combine two kinds of detection modes,
Isolated island can not only be detected exactly, and reduces the interference to power network.
In addition, by the repetition test of inventor, find in active detecting, resistive load is arranged to power network to be detected
4 times of impedance, and Ut≤0.8U0When, it can accurately judge the generation of isolated island effect.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of existing structured flowchart of distributed photovoltaic system；
Fig. 2 is the structured flowchart of the distributed photovoltaic power system of the embodiment of the present invention；
Fig. 3 is the flow chart of the distributed photovoltaic power grid control method of the embodiment of the present invention；
Fig. 4 is the structured flowchart of the distributed photovoltaic power grid control system of the embodiment of the present invention.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Technical scheme is described in detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in Figures 2 and 3, the embodiments of the invention provide a kind of distributed photovoltaic power grid control method, it is being distributed
A grid-connection control device is set in formula photo-voltaic power supply PV grid entry point, for passive type and/or active detection power network,；；The party
Method includes：
S1. passive type detection is started.
Specifically, passive type detection includes but is not limited to：The phase voltage and phase current of detection power network simultaneously obtain impedance angleCompare the impedance angleWith default impedance angle threshold valueImpedance angle is bigger, shows that power network is more unstable.When setting impedance
Angle threshold valueWhen too small, sensitivity is too high, photo-voltaic power supply may be caused continually to be disconnected with power network, and when setting impedance
Angle threshold valueWhen excessive, sensitivity is too low, may cause isolated island detection failure.Applicant passes through repetition test, finds impedance
Angle threshold valueIt during the arbitrary value being arranged in 80-100, can both avoid excessive sensitive, isolated island hair can be detected exactly again
It is raw.
Preferably, phase voltage and phase current are detected by Hall sensor.
S2. judgeWhether it is more than
Specifically, the condition is to start the condition of active detection.Work as judgementIt is more thanWhen, step S3 is performed,
Otherwise step S2 is returned to.
S3. active detection is started.
Specifically, the active detection includes but is not limited to:Resistive load is accessed into power network, the resistive load is the power network
4 times of impedance, compare the line voltage U before accessing the resistive load0With access the resistive load after line voltage
Ut.Applicant is had found after repetition test, and resistive load is arranged to 4 times of the impedance of power network to be detected, can compare reason
Think detection accuracy and reduce to reaching balance between the influence of power network.
Due to passive type, to detect consumption resource few, also small to electric network influencing, therefore after active detection is activated, can be with
Continue passive type detection.And two kinds of detections are carried out simultaneously, serve the effect of dual fail-safe.
S4. judge whetherOr Ut≤0.8U0。
Specifically, as long as one of above-mentioned condition is met, you can judge isolated island.Above-mentioned condition is by inventor
What repetition test was found, the generation of isolated island can be judged exactly.
Work as judgementOr Ut≤0.8U0When, step S5 is performed, otherwise return to step S4.
S5. the connection of the distributed photovoltaic power and the power network is disconnected.
The distributed photovoltaic power grid control method of the embodiment of the present invention, by start-up cost first it is relatively low, to power network
Disturb small passive type detection, detect considerable degree of disturbance (It is more than ) when, restart more accurate and effective,
But dysgenic active detection easily is produced to the power network quality of power supply, so as to organically combine two kinds of detection modes, no
Isolated island can be only detected exactly, and reduces the interference to power network.
As shown in figure 4, the embodiment of the present invention additionally provides a kind of distributed photovoltaic power grid control device, it is arranged on point
In the grid entry point of cloth photo-voltaic power supply, including：
Passive type detection unit 1, for detecting the phase voltage of power network and phase current and obtaining impedance angleAnd compare resistance
Anti- angleWith default impedance angle threshold value
Specifically, applicant passes through repetition test, finds impedance angle threshold valueThe arbitrary value being arranged in 80-100
When, it can both avoid excessive sensitive, isolated island can be detected exactly again.
Preferably, phase voltage and phase current are detected by Hall sensor.
Active detection start unit 2, it is connected with the passive type detection unit, is detected for working asWhen,
Start active detection module.
Active detection unit 4, it is connected with the active detection start unit, for resistive load to be accessed into power network, than
Compared with the line voltage U before the access resistive load0With the line voltage U after the access resistive loadt, wherein, it is described
Resistive load is 4 times of the impedance of the power network.
Applicant is had found after repetition test, and resistive load is arranged to 4 times of the impedance of power network to be detected, can be compared
More preferably in detection accuracy and reduction to reaching balance between the influence of power network.
It is also small to electric network influencing because passive type detection consumption resource is few, therefore after active detection unit is activated,
Passive type detection unit can continue.And two kinds of detections are carried out simultaneously, serve the effect of dual fail-safe.
Isolated island judging unit 4, it is connected with the active detection unit and the passive type detection unit, for when described passive
Formula detection unit detectsOr when the active detection unit detects Ut≤0.8U0When, judge isolated island occurs,
And disconnect the connection of the distributed photovoltaic power and the power network.Above-mentioned condition is found by inventor's repetition test,
The generation of isolated island can be judged exactly.
The distributed photovoltaic power grid control device of the embodiment of the present invention, by detecting phase in passive type detection unit
When degree disturbance (It is more than) when, restart active detection unit, organically combine two kinds of detection modes, no
Isolated island can be only detected exactly, and reduces the interference to power network.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (8)
- A kind of 1. distributed photovoltaic power grid control method, it is characterised in thatOne grid-connection control device is set in the grid entry point of the distributed photovoltaic power, for passive type and/or active inspection Power network is surveyed, wherein, the passive type detection includes：The phase voltage and phase current of detection power network simultaneously obtain impedance angle φ, compare institute State impedance angle φ and default impedance angle threshold value φ1；The active detection includes:Resistive load is accessed into power network, the resistance Property load be 4 times of impedance of the power network, compare the line voltage U before accessing the resistive load0With the access resistance Property load after line voltage Ut；The control method comprises the following steps：Start passive type detection；Judge whether φ is more than 80% φ1；When judging that φ is more than 80% φ1When, start active detection；Judge whether φ >=φ1, or Ut≤0.8U0；When judging φ >=φ1, or Ut≤0.8U0When, disconnect the connection of the distributed photovoltaic power and the power network.
- 2. according to the method for claim 1, it is characterised in that：Start active detection after, passive type detection continue into OK.
- 3. according to the method for claim 1, it is characterised in that：The impedance angle threshold value φ1For the arbitrary value in 80-100.
- 4. according to the method for claim 1, it is characterised in that：The phase voltage and phase current for detecting the power network include：It is logical Cross Hall sensor detection phase voltage and phase current.
- 5. a kind of distributed photovoltaic power grid control device, is arranged in the grid entry point of the distributed photovoltaic power, it is special Sign is, including：Passive type detection unit, for detecting the phase voltage of power network and phase current and obtaining impedance angle φ, and compare impedance angle φ and default impedance angle threshold value φ1；Active detection start unit, it is connected with the passive type detection unit, for being detected when the passive type detection unit To φ>80% φ1When, start active detection unit；Active detection unit, it is connected with the active detection start unit, for resistive load to be accessed into power network, compares and connect Enter the line voltage U before the resistive load0With the line voltage U after the access resistive loadt, wherein, it is described resistive Load 4 times of the impedance for the power network；Isolated island judging unit, it is connected with the active detection unit and the passive type detection unit, for when described passive Formula detection unit detects φ >=φ1, or when the active detection unit detects Ut≤0.8U0When, judge isolated island occurs, And disconnect the connection of the distributed photovoltaic power and the power network.
- 6. grid-connection control device according to claim 5, it is characterised in that：The passive type detection unit is arranged to, Continue to run after the active detection unit starting.
- 7. grid-connection control device according to claim 5, it is characterised in that：The impedance angle threshold value φ1For in 80-100 Arbitrary value.
- 8. grid-connection control device according to claim 5, it is characterised in that：The passive type detection unit is passed by Hall Sensor detects phase voltage and phase current.
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| CN201610137512.1A CN105656083B (en) | 2016-03-10 | 2016-03-10 | A kind of distributed photovoltaic power grid control method and device |
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| CN201610137512.1A CN105656083B (en) | 2016-03-10 | 2016-03-10 | A kind of distributed photovoltaic power grid control method and device |
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| CN105656083B true CN105656083B (en) | 2018-01-12 |
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| CN104682356B (en) * | 2015-02-10 | 2017-11-07 | 南京能迪电气技术有限公司 | Self-adapting changeable for distributed photovoltaic power loads anti-island method |
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