CN106093590A - Photovoltaic combining inverter multichannel input array impedance ground testing circuit and method - Google Patents
Photovoltaic combining inverter multichannel input array impedance ground testing circuit and method Download PDFInfo
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- CN106093590A CN106093590A CN201610723254.5A CN201610723254A CN106093590A CN 106093590 A CN106093590 A CN 106093590A CN 201610723254 A CN201610723254 A CN 201610723254A CN 106093590 A CN106093590 A CN 106093590A
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- photovoltaic
- ground connection
- rrm
- ground
- combining inverter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
Abstract
Photovoltaic combining inverter multichannel input array impedance ground testing circuit and method.The positive pole of every optical crosstalk photovoltaic assembly is connected in series ground connection after R1～Rn respectively, and the negative pole of photovoltaic module is R1 ' ground connection in parallel after connecing R1 ' ground connection afterwards, and R2 ' tandem tap S1 the most together.Circuit of the present invention is simple, and amount of calculation is low, and cost is relatively low.
Description
[technical field]
The present invention relates to photovoltaic combining inverter technical field, particularly to a kind of photovoltaic combining inverter multichannel input battle array
Row impedance ground testing circuit and method.
[background technology]
In photovoltaic generating system, owing to pursuing photovoltaic combining inverter high efficiency, existing market photovoltaic combining inverter
Great majority use transless isolation scheme, therefore to ensure operator safety, it is desirable to connect the photovoltaic module of inverter
There are enough impedance grounds.Photovoltaic combining inverter impedance ground at present, generally uses detection based on bridge balance principle
Method, the defects such as the method cost is high, complicated and computationally intensive.
[summary of the invention]
Offer a kind of electricity photovoltaic combining inverter multichannel input array impedance ground detection is provided
Circuit and method, can effectively solve the problem in background technology.
For achieving the above object, the technical scheme that the present invention takes is:
Electricity photovoltaic combining inverter multichannel input array impedance ground testing circuit, the positive pole of every optical crosstalk photovoltaic assembly is gone here and there respectively
Connection connects ground connection after R1～Rn, and the negative pole of photovoltaic module is R1 ' in parallel after connecing R1 ' ground connection afterwards, and R2 ' tandem tap S1 the most together
Ground connection.
Further, described R1～Rn, R1 ' and R2 ' are equal, take Rr=10M Ω.
The invention also discloses a kind of electricity photovoltaic combining inverter multichannel input array impedance ground detection method, its scheme
As follows:
The positive pole of every optical crosstalk photovoltaic assembly is connected in series ground connection respectively after R1～Rn, and the negative pole of photovoltaic module connects the most together
R1 ' ground connection in parallel after R1 ' ground connection afterwards, and R2 ' tandem tap S1；
When S1 is in closure state, U1 voltage of sampling, calculate U1=Udc*0.5*Rr/ (0.5*Rr+Rrm)；
When S1 is off, U2 voltage of sampling, calculate U2=Udc*Rr/ (Rr+Rrm)；
Calculate photovoltaic group valency impedance ground Rrm over the ground, Rrm=(Rm*Rr/n)/(Rm+Rr/n)；Rm is, Rr is detection electricity
Resistance；
Calculate photovoltaic module earth impedance value Rm, Rm=Rrm*Rr/ (Rr-nRrm).
Circuit of the present invention is simple, and amount of calculation is low, and cost is relatively low.
[accompanying drawing explanation]
Fig. 1 is photovoltaic module impedance ground equivalent circuit diagram of the present invention；
Fig. 2 is impedance ground testing circuit figure of the present invention；
Fig. 3 is that photovoltaic module of the present invention connects impedance ground testing circuit figure；
Fig. 4 is that photovoltaic module of the present invention connects the impedance ground testing circuit equivalent circuit when S1 is in closure state
Figure；
Fig. 5 is that photovoltaic module of the present invention connects the impedance ground testing circuit equivalent circuit when S1 is off
Figure.
[detailed description of the invention]
Seeing Fig. 1, photovoltaic module impedance ground equivalent circuit, wherein Rp1+, Rp2+ and Rpn+ respectively assembly positive pole connects
Ground impedance, Rp1-, Rp2-and Rpn-be respectively assembly minus earth impedance, and photovoltaic module self internal resistance only has below a little Europe, because of
The both positive and negative polarity earth impedance of this photovoltaic module is that Rp1+～Rpn+ and Rp1-～Rpn-is all in parallel for meeting Low ESR Rm.
Seeing Fig. 2, impedance ground testing circuit, the positive pole of every optical crosstalk photovoltaic assembly connects R1～Rn ground connection, photovoltaic module
Negative pole connects R1 ' ground connection, and R1 ' R2 ' tandem tap S1 (relay) ground connection in parallel the most together；Wherein R1～Rn, R1 ' and R2 '
Equal typically take Rr=10M Ω.
Seeing Fig. 3, after photovoltaic module connects impedance ground testing circuit, Rp1+～Rpn+ and Rp1-～Rpn-is respectively light
The impedance ground of photovoltaic assembly, R1～Rn, R1 ' and R2 ' be testing circuit resistance, photovoltaic module self internal resistance only has below a little Europe,
Therefore the equivalent circuit such as Fig. 4 after photovoltaic module connects impedance ground testing circuit, array voltage is equivalent to Udc, R1～Rn
Parallel value be Rr/n, Rrm be Rm and Rr/n parallel value, when S1 (relay) is in closure state, sample U1 voltage, U1=
Udc*0.5*Rr/(0.5*Rr+Rrm)；
When S1 (relay) is off, photovoltaic module connects the equivalent circuit after impedance ground testing circuit such as
Fig. 5.Sampling U2 voltage, U2=Udc*Rr/ (Rr+Rrm)；
Computing formula 1:U1=Udc*0.5*Rr/ (0.5*Rr+Rrm)
Computing formula 2:U2=Udc*Rr/ (Rr+Rrm)
Can be calculated by computing formula 1 and 2:
Formula 3:Rrm=Rr (U2-U1)/(2U1-U2)；Wherein U1 and U2 is voltage sample value, and Rr is detection resistance；
Owing to Rrm is that Rm and Rr/n parallel value calculates:
Formula 4:Rrm=(Rm*Rr/n)/(Rm+Rr/n)；Rm is photovoltaic group valency impedance ground over the ground, and Rr is detection resistance；
Can be calculated by formula 4:
Formula 5:Rm=Rrm*Rr/ (Rr-nRrm)；
Finally calculated Rrm by formula 3, then Rrm value of calculation substitution formula 5 just can be calculated Rm photovoltaic module over the ground
Resistance value.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.The technology of the industry
Personnel, it should be appreciated that the present invention is not restricted to the described embodiments, simply illustrating this described in above-described embodiment and description
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these become
Change and improvement both falls within scope of the claimed invention.Claimed scope by appending claims and
Equivalent defines.
Claims (3)
1. photovoltaic combining inverter multichannel input array impedance ground testing circuit, it is characterised in that: every optical crosstalk photovoltaic assembly is just
Pole is connected in series ground connection after R1～Rn respectively, and the negative pole of photovoltaic module meets R1 ' ground connection afterwards, and R2 ' tandem tap S1 the most together
Rear R1 ' ground connection in parallel.
Circuit the most according to claim 1, it is characterised in that: described R1～Rn, R1 ' and R2 ' are equal, take Rr=10M Ω.
3. electricity photovoltaic combining inverter multichannel input array impedance ground detection method, it is characterised in that its scheme is as follows:
The positive pole of every optical crosstalk photovoltaic assembly is connected in series ground connection respectively after R1～Rn, and the negative pole of photovoltaic module meets R1 ' the most together
R1 ' ground connection in parallel after rear ground connection, and R2 ' tandem tap S1；
When S1 is in closure state, U1 voltage of sampling, calculate U1=Udc*0.5*Rr/ (0.5*Rr+Rrm)；
When S 1 is off, U2 voltage of sampling, calculate U2=Udc*Rr/ (Rr+Rrm)；
Calculate photovoltaic group valency impedance ground Rrm over the ground, Rrm=(Rm*Rr/n)/(Rm+Rr/n)；Rm is, Rr is detection resistance；
Calculate photovoltaic module earth impedance value Rm, Rm=Rrm*Rr/ (Rr-nRrm).
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| CN201610723254.5A CN106093590A (en) | 2016-08-25 | 2016-08-25 | Photovoltaic combining inverter multichannel input array impedance ground testing circuit and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490258A (en) * | 2018-02-10 | 2018-09-04 | 深圳硕日新能源科技有限公司 | A kind of detection circuit and detection method of photovoltaic generating system ground insulation resistance |
| CN109061309A (en) * | 2018-10-11 | 2018-12-21 | 沃尔特电子（苏州）有限公司 | A kind of car body insulated measurement circuits and measurement method |
| CN110687476A (en) * | 2019-10-16 | 2020-01-14 | 阳光电源股份有限公司 | Grounding detection method and application equipment thereof |
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| CN105785133A (en) * | 2016-04-15 | 2016-07-20 | 易事特集团股份有限公司 | Insulation resistance to ground detecting circuit, method and device for dual-path photovoltaic inverter |
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| CN108490258A (en) * | 2018-02-10 | 2018-09-04 | 深圳硕日新能源科技有限公司 | A kind of detection circuit and detection method of photovoltaic generating system ground insulation resistance |
| CN109061309A (en) * | 2018-10-11 | 2018-12-21 | 沃尔特电子（苏州）有限公司 | A kind of car body insulated measurement circuits and measurement method |
| CN109061309B (en) * | 2018-10-11 | 2021-03-26 | 沃尔特电子（苏州）有限公司 | Vehicle body insulation measuring circuit and measuring method |
| CN110687476A (en) * | 2019-10-16 | 2020-01-14 | 阳光电源股份有限公司 | Grounding detection method and application equipment thereof |
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