CN106208952A - A kind of method of photovoltaic system anti-PID effect - Google Patents
A kind of method of photovoltaic system anti-PID effect Download PDFInfo
- Publication number
- CN106208952A CN106208952A CN201610792106.9A CN201610792106A CN106208952A CN 106208952 A CN106208952 A CN 106208952A CN 201610792106 A CN201610792106 A CN 201610792106A CN 106208952 A CN106208952 A CN 106208952A
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- Prior art keywords
- inverter
- voltage
- machine
- minus earth
- pid effect
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 239000003054 catalyst Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 210000004027 cell Anatomy 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 210000004460 N cell Anatomy 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
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
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
-
- H02J3/383—
-
- 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
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The present invention discloses the method for a kind of photovoltaic system anti-PID effect, including: for single stage shift system, controller obtains the inverter that the interior PV voltage of net is the highest, is accessed by the controlled minus earth device of this inverter, it is achieved anti-PID effect；For double stage conversion system, select host, controller obtains the busbar voltage peak from machine, controls main frame busbar voltage higher than from the highest busbar voltage of machine, it is achieved anti-PID effect；The present invention not only solves the circulation excessive problem that the equal minus earth of all inverters is caused, and solve current potential that high resistance ground causes cannot clamper to zero problem, and by controlled minus earth mode, can be disconnected by controller when causing danger, at utmost ensure security of system.
Description
Technical field
The present invention relates to field of photovoltaic power generation, the method particularly relating to a kind of photovoltaic system anti-PID effect.
Background technology
Potential induction attenuation (Potential Induced Degradation, PID) refers to cell piece and ground connection frame
Between under action of high voltage occur sodium ion skew, cause cell panel to be decayed, affect generated energy.For multi-inverter AC
The most in parallel, then by the grid-connected occasion of same transformator, some method solving PID effect is that the difference by cell panel is joined
Put so that the cell panel of certain inverter, than other multi-configuration M blocks (M >=1), causes the PV voltage of this inverter higher than other
Inverter, then by the minus earth of this inverter, it is achieved the negative pole voltage-to-ground lifting of other inverters.This method has
Two than more serious deficiency: one is if inverter is Two Stages, although this inverter PV voltage of ground connection is the highest
, but busbar voltage is not the highest, and by after the minus earth of this inverter, busbar voltage is higher than this inverter
Negative pole is not clamped to zero；Two is that this inverter cell panel is than normal multi-configuration, it is possible to cause under cryogenic
The DC voltage of this inverter exceedes system insulation voltage, causes potential safety hazard.The most also there is every inverter all by resistance
Anti-realize minus earth scheme, if this earthing mode resistance selection is too big, negative pole voltage-to-ground can be caused clamper to arrive
Zero point, does not reaches anti-PID purpose；If resistance selection is the least, when the busbar voltage of inverter differs greatly, can cause bigger
System circulation, cause resistance heating even to damage, affect system stability.
Summary of the invention
It is an object of the invention to the method by a kind of photovoltaic system anti-PID effect, solve background above technology department
Divide the problem mentioned.
For reaching this purpose, the present invention by the following technical solutions:
A kind of method of photovoltaic system anti-PID effect, comprising:
S101, the most in parallel for multi-inverter AC, then by the grid-connected occasion of same transformator, it is judged that inversion
Device system is single stage shift system or double stage conversion system, if single stage shift system, then performs step S102, if twin-stage
Transformation system, then perform step S103；
S102, for single stage shift system, controller obtains the inverter that PV voltage in net is the highest, by this inverter
Controlled minus earth device enable, the most now the negative pole of other inverters is clamped to zero or positive level to ground level；
S103, for comprising the double stage conversion system of DC/DC and DC/AC inverter, in double stage conversion system selected one
Platform main frame, controller obtains the busbar voltage peak from machine, and then controls the busbar voltage ratio of main frame from machine the highest bus electricity
Pressure exceeds U, the controlled minus earth device of main frame is cut double stage conversion system, is all clamped to from the negative pole voltage-to-ground of machine
0 or positive voltage；Wherein, the described inverter referred to double stage conversion system from machine in addition to main frame；U≥0V.
Especially, described controlled minus earth device includes but not limited to relay, catalyst, switching tube.
Especially, described controller issues through but not limited to use communication manager or dry contact obtains PV voltage or mother
Line voltage
The method of the photovoltaic system anti-PID effect that the present invention proposes obtains PV in net for single stage shift system, controller
The inverter that voltage is the highest, accesses the controlled minus earth device of this inverter, it is achieved anti-PID effect；For twin-stage
Transformation system, select host, controller obtains the busbar voltage peak from machine, controls main frame busbar voltage the highest higher than from machine
Busbar voltage, it is achieved anti-PID effect；The present invention not only solves the circulation that the equal minus earth of all inverters caused and exceeds standard and ask
Topic, and solve current potential that high resistance ground causes cannot clamper to zero problem, and by controlled minus earth mode, occurring
Can be disconnected by controller time dangerous, at utmost ensure security of system.
Accompanying drawing explanation
The method flow diagram of the photovoltaic system anti-PID effect that Fig. 1 provides for the embodiment of the present invention；
The single stage shift system anti-PID effect schematic diagram that Fig. 2 provides for the embodiment of the present invention；
The double stage conversion system anti-PID effect schematic diagram that Fig. 3 provides for the embodiment of the present invention.
Detailed description of the invention
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is described more fully.In accompanying drawing
Give presently preferred embodiments of the present invention.But, the present invention can realize in many different forms, however it is not limited to institute herein
The embodiment described.On the contrary, provide the purpose of these embodiments be make to the disclosure understand more thorough
Comprehensively.It should be noted that when an element is considered as " connection " another element, and it can be directly to another
Element or may be simultaneously present centering elements.Unless otherwise defined, all of technology used herein and scientific terminology with
Belong to the implication that the those skilled in the art of the present invention are generally understood that identical.Made the most in the description of the invention
Term be intended merely to describe specific embodiment purpose, it is not intended that in limit the present invention.Term as used herein
" and/or " include the arbitrary and all of combination of one or more relevant Listed Items.
Refer to shown in Fig. 1, the method flow diagram of the photovoltaic system anti-PID effect that Fig. 1 provides for the embodiment of the present invention.
In the present embodiment, the method for photovoltaic system anti-PID effect includes:
S101, the most in parallel for multi-inverter AC, then by the grid-connected occasion of same transformator, it is judged that inversion
Device system is single stage shift system or double stage conversion system, if single stage shift system, then performs step S102, if twin-stage
Transformation system, then perform step S103.
S102, for single stage shift system, controller obtains the inverter that PV voltage in net is the highest, by this inverter
Controlled minus earth device enable, the most now the negative pole of other inverters is clamped to zero or positive level to ground level, both solves
Determine PID efficiency problem, also solved the common mode loop flow problem caused due to multiple stage inverter minus earth.Concrete such as Fig. 2
Shown in, the single stage shift system anti-PID effect schematic diagram that Fig. 2 provides for the embodiment of the present invention, in figure, single stage shift inverter is i.e.
Refer to the inverter of single stage shift system.
S103, for comprising the double stage conversion system of DC/DC and DC/AC inverter, in double stage conversion system selected one
Platform main frame, controller obtains the busbar voltage peak from machine, and then controls the busbar voltage ratio of main frame from machine the highest bus electricity
Pressure exceeds U, the controlled minus earth device of main frame is cut double stage conversion system, is all clamped to from the negative pole voltage-to-ground of machine
0 or positive voltage；Wherein, the described inverter referred to double stage conversion system from machine in addition to main frame；U≥0V.Concrete such as Fig. 3 institute
Showing, the double stage conversion system anti-PID effect schematic diagram that Fig. 3 provides for the embodiment of the present invention, N cell panel is even in the present embodiment
The DC/DC connect is main frame, and remaining is from machine.
It is noted that controlled minus earth device described in the present embodiment include but not limited to relay, catalyst,
Switching tube, switching tube can be IGBT or other switching devices；Controlled minus earth device is by relay, catalyst or switch
Pipe is directly grounded or by extremely low impedance earth.Described controller issues or dry contact through but not limited to use communication manager
Obtain PV voltage or busbar voltage.
Technical scheme is for single stage shift system, and controller obtains the inversion that the interior PV voltage of net is the highest
Device, accesses the controlled minus earth device of this inverter, it is achieved anti-PID effect；For double stage conversion system, select host,
Controller obtains the busbar voltage peak from machine, controls main frame busbar voltage higher than from the highest busbar voltage of machine, it is achieved anti-PID
Effect；The present invention not only solves the circulation excessive problem that the equal minus earth of all inverters is caused, and solves high resistant
The current potential that ground connection is caused cannot clamper to zero problem, and by controlled minus earth mode, can be by controlling when causing danger
Device disconnects, and at utmost ensures security of system.
The know-why of the present invention is described above in association with specific embodiment.These describe and are intended merely to explain the present invention's
Principle, and limiting the scope of the invention can not be construed to by any way.Based on explanation herein, the technology of this area
Personnel need not pay performing creative labour can associate other detailed description of the invention of the present invention, and these modes fall within
Within protection scope of the present invention.
Claims (3)
1. the method for a photovoltaic system anti-PID effect, it is characterised in that including:
S101, the most in parallel for multi-inverter AC, then by the grid-connected occasion of same transformator, it is judged that inverter system
It is single stage shift system or double stage conversion system, if single stage shift system, then performs step S102, if double stage conversion system
System, then perform step S103；
S102, for single stage shift system, controller obtains the inverter that PV voltage in net is the highest, by this inverter can
Control minus earth device enables, and the most now the negative pole of other inverters is clamped to zero or positive level to ground level；
S103, for comprising the double stage conversion system of DC/DC and DC/AC inverter, a selected master in double stage conversion system
Machine, controller obtains the busbar voltage peak from machine, and then the busbar voltage controlling main frame is higher than from the highest busbar voltage of machine
Go out U, the controlled minus earth device of main frame cut double stage conversion system, from the negative pole voltage-to-ground of machine be all clamped to 0 or
Positive voltage；Wherein, the described inverter referred to double stage conversion system from machine in addition to main frame；U≥0V.
The method of photovoltaic system the most according to claim 1 anti-PID effect, it is characterised in that described controlled minus earth
Device includes but not limited to relay, catalyst, switching tube.
The method of photovoltaic system the most according to claim 1 anti-PID effect, it is characterised in that described controller by but
It is not limited to use communication manager to issue or dry contact obtains PV voltage or busbar voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610792106.9A CN106208952A (en) | 2016-08-31 | 2016-08-31 | A kind of method of photovoltaic system anti-PID effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610792106.9A CN106208952A (en) | 2016-08-31 | 2016-08-31 | A kind of method of photovoltaic system anti-PID effect |
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| CN106208952A true CN106208952A (en) | 2016-12-07 |
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| CN201610792106.9A Pending CN106208952A (en) | 2016-08-31 | 2016-08-31 | A kind of method of photovoltaic system anti-PID effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107492905A (en) * | 2017-08-22 | 2017-12-19 | 上能电气股份有限公司 | A kind of photovoltaic system for exchanging common-mode voltage adjusting means and the application device |
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|---|---|---|---|---|
| CN203218893U (en) * | 2013-04-24 | 2013-09-25 | 阳光电源（上海）有限公司 | Device for solving potential induction attenuation |
| CN104242811A (en) * | 2014-09-24 | 2014-12-24 | 彭书芳 | Photovoltaic power supply system |
| CN204131141U (en) * | 2014-10-11 | 2015-01-28 | 上海正泰电源系统有限公司 | Adopt the photovoltaic generating system of virtual ground technology |
| CN204258328U (en) * | 2014-08-21 | 2015-04-08 | 山亿新能源股份有限公司 | A kind of potential potential induction attenuation circuit of anti-multi-machine parallel connection photovoltaic generating system and regulator |
| CN204948018U (en) * | 2015-08-31 | 2016-01-06 | 上海正泰电源系统有限公司 | A kind of circuit of multi-machine parallel connection system prevention cell panel PID effect |
-
2016
- 2016-08-31 CN CN201610792106.9A patent/CN106208952A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203218893U (en) * | 2013-04-24 | 2013-09-25 | 阳光电源（上海）有限公司 | Device for solving potential induction attenuation |
| CN204258328U (en) * | 2014-08-21 | 2015-04-08 | 山亿新能源股份有限公司 | A kind of potential potential induction attenuation circuit of anti-multi-machine parallel connection photovoltaic generating system and regulator |
| CN104242811A (en) * | 2014-09-24 | 2014-12-24 | 彭书芳 | Photovoltaic power supply system |
| CN204131141U (en) * | 2014-10-11 | 2015-01-28 | 上海正泰电源系统有限公司 | Adopt the photovoltaic generating system of virtual ground technology |
| CN204948018U (en) * | 2015-08-31 | 2016-01-06 | 上海正泰电源系统有限公司 | A kind of circuit of multi-machine parallel connection system prevention cell panel PID effect |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107492905A (en) * | 2017-08-22 | 2017-12-19 | 上能电气股份有限公司 | A kind of photovoltaic system for exchanging common-mode voltage adjusting means and the application device |
| CN107492905B (en) * | 2017-08-22 | 2020-09-29 | 上能电气股份有限公司 | Alternating current common mode voltage adjusting device and photovoltaic system applying same |
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Application publication date: 20161207 |
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