CN209559977U - Inverter direct-flow side insulation resistance detection circuit and string type inverter - Google Patents
Inverter direct-flow side insulation resistance detection circuit and string type inverter Download PDFInfo
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- CN209559977U CN209559977U CN201920180864.4U CN201920180864U CN209559977U CN 209559977 U CN209559977 U CN 209559977U CN 201920180864 U CN201920180864 U CN 201920180864U CN 209559977 U CN209559977 U CN 209559977U
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Abstract
Inverter direct-flow side insulation resistance detection circuit provided by the utility model and string type inverter including the inverter direct-flow side insulation resistance detection circuit, in the cathode detection circuit of its inverter direct-flow side insulation resistance detection circuit, combining is realized by the input cathode that each combiner unit makes each MPPT input branch, it is realized again by a switch unit after combining and MPPT inputs the connection of branch exported between bus cathode, and then can be realized the detection for negative insulation impedance.Also, the relay that the application replaces the input cathode of each MPPT input branch respectively to need to connect with a switch unit, and then solve the problems, such as that the relay quantity of negative insulation impedance detection in the prior art is more, control is complicated and at high cost.
Description
Technical field
The utility model relates to power electronics field, in particular to a kind of inverter direct-flow side insulation impedance detection electricity
Road and string type inverter.
Background technique
The DC side of string type inverter generally comprised multichannel MPPT (Maximum Power Point Tracking,
MPPT maximum power point tracking) input branch, in string type bipolar DC 1500V high-voltage inverter system, generally using shown in Fig. 1
The symmetrical three level BOOST of multichannel MPPT.
As shown in Figure 1, including filter and symmetrical three level BOOST circuit in its each road MPPT input branch；
MPPT is inputted in branch, and input anode is connected with the positive PV+ of corresponding photovoltaic group string, input cathode and corresponding photovoltaic
The cathode PV- of group string is connected, and output head anode is denoted as BUS+, and negative pole of output end is denoted as BUS-, and output end midpoint is denoted as
NEU.For current branch when preventing the BOOST of each MPPT input branch from working at the same time in the presence of unevenness stream, need each road MPPT
It inputs between the PV- and PV- of branch and is separated from each other, therefore the direct current of the symmetrical three level BOOST inverter of current multichannel MPPT is exhausted
Edge impedance detection is individually controlled using every MPPT input branch, the insulation impedance detection of the every MPPT input branch of DC side
Circuit is made of relay K and resistance R.When carrying out negative insulation impedance detection, it is attracted, is made by control relay K
BUS- is connect with PV-；If inverter has the road n MPPT to input branch, negative insulation detection needs n relay K and current limliting
Resistance R, and negative insulation detection control in the road n is set.
Therefore, there are negative insulation impedance detections to use more relay quantity, control complexity and cost for above-mentioned technical proposal
High disadvantage, as string type inverter power is increasing, MPPT input number of branches are also more and more, and the prior art lacks
Point becomes increasingly conspicuous.
Utility model content
The utility model provides a kind of inverter direct-flow side insulation resistance detection circuit and string type inverter, existing to solve
There are more relay quantity of negative insulation impedance detection in technology, control complexity and problem at high cost.
To achieve the above object, technical solution provided by the present application is as follows:
A kind of inverter direct-flow side insulation resistance detection circuit, with n MPPT input branch be connected, n is greater than 1
Positive integer；The inverter direct-flow side insulation resistance detection circuit includes: positive detection circuit and cathode detection circuit；
The cathode detection circuit includes: a switch unit and n combiner unit；Wherein:
The first end of n combiner unit is connected with the input cathode one-to-one correspondence of n MPPT input branch；
The second end of n combiner unit is connected with the first end of the switch unit；
The second end of the switch unit is connected with the output bus cathode of n MPPT input branch.
Preferably, the switch unit includes: relay or semiconductor switch pipe.
Preferably, the cathode detection circuit further include: the current limiting unit being connected in series with the switch unit；
One end of the current limiting unit is connected with the switch unit, the other end of the current limiting unit and each conjunction
The second end of road unit is connected；Alternatively,
One end of the current limiting unit is connected with the switch unit, and the other end of the current limiting unit and the output are female
Line cathode is connected.
Preferably, the current limiting unit includes: resistance.
Preferably, the combiner unit includes: diode；
The anode of the diode is the first end of the combiner unit；
The cathode of the diode is the second end of the combiner unit.
Preferably, the combiner unit includes impedance.
Preferably, the combiner unit includes: diode and the impedance of series connection；
One end of the impedance is the first end of the combiner unit, the sun of the other end of the impedance and the diode
Extremely it is connected, the cathode of the diode is the second end of the combiner unit；Alternatively,
The anode of the diode is the first end of the combiner unit, the cathode of the diode and the one of the impedance
End is connected, and the other end of the impedance is the second end of the combiner unit.
Preferably, the positive detection circuit is identical as the structure of the cathode detection circuit.
A kind of string type inverter a, comprising: inverter circuit, n MPPT input branch and as described in any of the above-described
Inverter direct-flow side insulation resistance detection circuit, n are the positive integer greater than 1；Wherein:
The input terminal of n MPPT input branch is connected with n photovoltaic group string one-to-one correspondence respectively；
The output head anode of n MPPT input branch is connected, and tie point is inputting the output bus of branch just as n MPPT
Pole is connected with the DC side anode of the inverter circuit；
The negative pole of output end of n MPPT input branch is connected, and tie point is negative as the output bus of n MPPT input branch
Pole is connected with the DC side cathode of the inverter circuit.
Preferably, the MPPT input branch includes: filter circuit and symmetrical three level BOOST circuit；
The input terminal of the filter circuit is the input terminal that the MPPT inputs branch；
The output end of the filter circuit is connected with the low-pressure side of the symmetrical three level BOOST circuit；
The output head anode of the just extremely described MPPT input branch in the high-pressure side of the symmetrical three level BOOST circuit, institute
The high-pressure side cathode for stating symmetrical three level BOOST circuit is the negative pole of output end of MPPT input branch, symmetrical three electricity
The high-pressure side midpoint of flat BOOST circuit is the output end midpoint that the MPPT inputs branch.
Inverter direct-flow side insulation resistance detection circuit provided by the utility model, in cathode detection circuit, by each
A combiner unit makes the input cathode of each MPPT input branch realize combining, is realized again by a switch unit after combining
Connection between the output bus cathode of MPPT input branch, and then can be realized the detection for negative insulation impedance.And
And the relay that the application replaces the input cathode of each MPPT input branch respectively to need to connect with a switch unit,
And then solve the problems, such as that the relay quantity of negative insulation impedance detection in the prior art is more, control is complicated and at high cost.
Detailed description of the invention
It, below will be to embodiment in order to illustrate more clearly of the technical solution in the utility model embodiment or the prior art
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, interior attached drawing is described below only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the circuit diagram for the inverter direct-flow side insulation resistance detection circuit that the prior art provides；
Fig. 2 is the structural representation for the inverter direct-flow side insulation resistance detection circuit that present utility model application embodiment provides
Figure；
Fig. 3 a and Fig. 3 b are the inverter direct-flow side insulation resistance detection circuits that present utility model application embodiment provides
A kind of circuit diagram；
Fig. 4 a and Fig. 4 b are the inverter direct-flow side insulation resistance detection circuits that present utility model application embodiment provides
Another circuit diagram；
Fig. 5 a and Fig. 5 b are the inverter direct-flow side insulation resistance detection circuits that present utility model application embodiment provides
Another circuit diagram.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
The utility model provides a kind of inverter direct-flow side insulation resistance detection circuit, exhausted to solve cathode in the prior art
The relay quantity of edge impedance detection is more, control is complicated and problem at high cost.
Specifically, referring to Fig. 2, which inputs branch phase with n MPPT
Even, n is the positive integer greater than 1；The n MPPT input branch can be each input branch of string type inverter internal, can also
To be each input branch being set to outside centralized inverter DC side, within the scope of protection of this application.
The inverter direct-flow side insulation resistance detection circuit includes: positive detection circuit 100 and cathode detection circuit 200；
Wherein, cathode detection circuit 200 includes: a switch unit 201 and n combiner unit 202.
In cathode detection circuit 200, the first end of n combiner unit 202 and the input terminal of n MPPT input branch are negative
Pole (namely such as the photovoltaic group string cathode PV1- in Fig. 2 ..., PVn-), which corresponds, to be connected；The second end of n combiner unit 202
It is connected with the first end of switch unit 201；The second end of switch unit 201 and the output bus of n MPPT input branch are negative
Pole BUS- is connected.
That is, the input cathode of all MPPT input branches passes through corresponding combiner unit 202 respectively and carries out
Combining, then be connected by switch unit 201 with output bus cathode BUS-.When needing to carry out negative insulation impedance detection, as long as
Control switch unit 201 is closed, that is, is saved n-1 relay, reduced costs, and is in turn simplified control logic, is improved
Reliability.
The inverter direct-flow side insulation resistance detection circuit provided in this embodiment is replaced every with a switch unit 201
The relay that the input cathode of a MPPT input branch respectively needs to connect, and then solve negative insulation resistance in the prior art
The relay quantity of anti-detection is more, control is complicated and problem at high cost.
Preferably, positive detection circuit 100 is identical as the structure of cathode detection circuit 200, as shown in Fig. 2, comprising:
One switch unit 101 and n combiner unit 102.In positive detection circuit 100, the first end of n combiner unit 102 with
The input anode (namely such as the photovoltaic group string anode PV1+ in Fig. 2 ..., PVn+) of n MPPT input branch corresponds phase
Even；The second end of n combiner unit 102 is connected with the first end of switch unit 101；The second end and n of switch unit 101
The output bus anode BUS+ that MPPT inputs branch is connected.
That is, the input anode of all MPPT input branches passes through corresponding combiner unit 102 respectively and is closed
Road, then be connected by switch unit 101 with output bus anode BUS+.When needing to carry out the detection of positive insulation impedance, as long as control
Switch unit 101 processed is closed.
Another embodiment of the utility model gives a kind of specific inverter direct-flow side insulation resistance detection circuit, upper
On the basis for stating embodiment and Fig. 2, as shown in Figure 3a and Figure 3b shows, the switch unit 201 in cathode detection circuit 200 is wrapped
Relay is included, the switch unit 101 in positive detection circuit 100 also includes relay.
Certainly, in practical application, in the switch unit 201 and positive detection circuit 100 in the cathode detection circuit 200
Switch unit 101 can also each be realized using semiconductor switch pipe, alternatively, its specific application environment can also be regarded to positive and negative anodes
Switch unit in two detection circuits carries out other settings, can be realized electronically controlled various switches in the prior art and exists
In the protection scope of the application.
As shown in Figure 3a, all MPPT are inputted to before DC impedance detection by 1 relay K1 the input of branch
End cathode PV- is connect with output bus cathode BUS-；The topology both reached DC side insulation impedance detection needed for PV- with
The condition of BUS- connection, and reduce n-1 relay and n-1 resistance compared to the prior art shown in FIG. 1, and it increases
Combiner unit 202 cost be far below relay cost.Shown in Fig. 3 b, pass through 1 relay before DC impedance detection
The input anode PV+ of all MPPT input branches is connect by K1 with output bus anode BUS+, and it is exhausted both to have reached DC side
The condition that PV+ needed for edge impedance detection is connect with BUS+, and reduce n-1 relay and n-1 resistance.Entire DC side
The cost of insulation resistance detection circuit is low, control is simple.
In addition, more preferably, as shown in Figure 3a, in the cathode detection circuit 200 further include: gone here and there with switch unit 201
Join the current limiting unit 203 of connection.
Wherein, one end of current limiting unit 203 is connected with switch unit 201, the other end of current limiting unit 203 and each combining
The second end of unit 202 is connected, as shown in Figure 3a.Alternatively, one end of current limiting unit 203 is connected with switch unit 201, current limliting list
The other end of member 203 is connected and (is not illustrated) with output bus cathode BUS-.
Similarly, it is preferred that as shown in Figure 3b, in the anode detection circuit 100 further include: with 201 company of series connection of switch unit
The current limiting unit 103 connect.
Wherein, one end of current limiting unit 103 is connected with switch unit 101, the other end of current limiting unit 103 and each combining
The second end of unit 102 is connected, as shown in Figure 3b.Alternatively, one end of current limiting unit 103 is connected with switch unit 101, current limliting list
The other end of member 103 is connected and (is not illustrated) with output bus anode BUS+.
It is worth noting that the effect of current limiting unit 203 and 103 is current limliting, can be realized by resistance.And it actually answers
In, it can also be realized using other impedances, as long as can be realized the function of current limliting, the selecting party of various specific devices
Case is within the scope of protection of this application.
This gives the circuit specific implementation forms after a kind of combining, it is to be understood that Fig. 3 a and Fig. 3 b
Only a kind of example is not unique way of realization, and any alternative is within the scope of protection of this application.
Remaining structure and principle are same as the previously described embodiments, no longer repeat one by one herein.
Another embodiment of the utility model additionally provides another specific inverter direct-flow side insulation impedance detection electricity
Road provides multiple choices for the specific setting of each combiner unit on the basis of above-described embodiment and Fig. 2 to Fig. 3 b
Scheme:
For example, the combiner unit 202 in cathode detection circuit 200 includes the diode (D1 ... in such as Fig. 3 a, Dn institute
Show), the combiner unit 102 in positive detection circuit 100 also includes diode (D1 ... in such as Fig. 3 b, shown in Dn).
In its combiner unit 202, the anode of diode is the first end of combiner unit 202, and the cathode of diode is combining
The second end of unit 202.And in its combiner unit 102, the anode of diode is the second end of combiner unit 202, diode
Cathode is the first end of combiner unit 202.
Diode D1 ... Dn in Fig. 3 a and Fig. 3 b can be used in obstructing the loop problem of BOOST circuit.
Alternatively, as shown in figures 4 a and 4b, combiner unit 202 includes impedance Z (R1 ... in such as Fig. 4 a, shown in Rn),
Combiner unit 102 also includes impedance Z (R1 ... in such as Fig. 4 b, shown in Rn).
Or combiner unit 202 can also include: the diode and impedance Z of series connection, as shown in Fig. 5 a
Shown in R1 and D1 ..., Rn and Dn)；Correspondingly, combiner unit 102 includes: diode and impedance Z, R1 as illustrated in fig. 5b and
Shown in D1 ..., Rn and Dn)；
It for the inside of each combiner unit 202, can be as shown in Figure 5 a, one end of impedance Z is combiner unit
202 first end, the other end of impedance Z are connected with the anode of diode, and the cathode of diode is the second of combiner unit 202
End.Referring to Fig. 5 a, one end of impedance R1 is the first end of first combiner unit 202, the other end and diode of impedance R1
The anode of D1 is connected, and the cathode of diode D1 is the second end of first combiner unit 202；And one end of its impedance Rn is last
The other end of the first end of one combiner unit 202, impedance Rn is connected with the anode of diode Dn, and the cathode of diode Dn is
The second end of the last one combiner unit 202.
In addition, the inside of each combiner unit 202, can also be that another series system, the anode of diode are
The first end of combiner unit 202, the cathode of diode are connected with one end of impedance, and the other end of impedance is combiner unit 202
Second end.Although not illustrated, its connection type belong to it will be appreciated by those skilled in the art that scheme, be also at this Shen
In protection scope please.
Similarly, the inside of each of which combiner unit 102 can be cascade as shown in Figure 5 b, be also possible in addition
A kind of cascade of location swap, no longer repeats one by one herein.
Impedance in above topology can be single resistance or multiple resistance connected in series and parallel, be also possible to other
It is capable of providing the device of impedance, depending on its specific application environment, within the scope of protection of this application.
This gives the specific implementation forms of several combiner units, certainly, its tool can also be regarded in practical application
Body application environment carries out other settings, as long as the side that can be combined the corresponding pole of input terminal for inputting branch each MPPT
Case, within the scope of protection of this application.
Remaining structure and principle are same as the previously described embodiments, no longer repeat one by one herein.
Another embodiment of the utility model additionally provides a kind of string type inverter, as shown in Fig. 2 to Fig. 5 b, comprising: one
A inverter circuit (not being shown), n MPPT input branch and inverter direct-flow side as described in above-mentioned any embodiment are exhausted
Edge impedance detection circuit, n are the positive integer greater than 1；Wherein:
The input terminal of n MPPT input branch is connected with n photovoltaic group string one-to-one correspondence respectively；
The output head anode of n MPPT input branch is connected, and tie point is inputting the output bus of branch just as n MPPT
Pole BUS+ is connected with the DC side anode of inverter circuit；
The negative pole of output end of n MPPT input branch is connected, and tie point is negative as the output bus of n MPPT input branch
Pole BUS- is connected with the DC side cathode of inverter circuit.
Preferably, as shown in Fig. 2 to Fig. 5 b, MPPT input branch includes: filter circuit and symmetrical three level BOOST electricity
Road；
The input terminal of filter circuit is the input terminal that MPPT inputs branch；
The output end of filter circuit is connected with the low-pressure side of symmetrical three level BOOST circuit；
The output head anode BUS+ of the high-pressure side just extremely MPPT input branch of symmetrical three level BOOST circuit, symmetrical three
The high-pressure side cathode of level BOOST circuit is the negative pole of output end BUS- that MPPT inputs branch, symmetrical three level BOOST circuit
High-pressure side midpoint be MPPT input branch output end midpoint NEU.
The structure and working principle of its inverter direct-flow side insulation resistance detection circuit is same as the previously described embodiments, herein not
It repeats one by one again.
Each embodiment is described in a progressive manner in the utility model, the highlights of each of the examples are with its
The difference of his embodiment, the same or similar parts in each embodiment may refer to each other.For being filled disclosed in embodiment
For setting, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part
Explanation.
The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model
Limitation.Although the utility model has been disclosed with preferred embodiment as above, it is not intended to limit the utility model.It is any ripe
Those skilled in the art is known, in the case where not departing from technical solutions of the utility model ambit, all using the side of the disclosure above
Method and technology contents make many possible changes and modifications to technical solutions of the utility model, or be revised as equivalent variations etc.
Imitate embodiment.Therefore, all contents without departing from technical solutions of the utility model, according to the technical essence of the utility model to
Any simple modifications, equivalents, and modifications that upper embodiment is done still fall within the model of technical solutions of the utility model protection
In enclosing.
Claims (10)
1. a kind of inverter direct-flow side insulation resistance detection circuit, which is characterized in that be connected with n MPPT input branch, n is big
In 1 positive integer；The inverter direct-flow side insulation resistance detection circuit includes: positive detection circuit and cathode detection circuit；
The cathode detection circuit includes: a switch unit and n combiner unit；Wherein:
The first end of n combiner unit is connected with the input cathode one-to-one correspondence of n MPPT input branch；
The second end of n combiner unit is connected with the first end of the switch unit；
The second end of the switch unit is connected with the output bus cathode of n MPPT input branch.
2. inverter direct-flow side insulation resistance detection circuit according to claim 1, which is characterized in that the switch unit
It include: relay or semiconductor switch pipe.
3. inverter direct-flow side insulation resistance detection circuit according to claim 1, which is characterized in that the cathode detection
Circuit further include: the current limiting unit being connected in series with the switch unit；
One end of the current limiting unit is connected with the switch unit, and the other end of the current limiting unit and each combining are single
The second end of member is connected；Alternatively,
One end of the current limiting unit is connected with the switch unit, and the other end of the current limiting unit and the output bus are negative
Extremely it is connected.
4. inverter direct-flow side insulation resistance detection circuit according to claim 3, which is characterized in that the current limiting unit
It include: resistance.
5. inverter direct-flow side insulation resistance detection circuit according to claim 1, which is characterized in that the combiner unit
It include: diode；
The anode of the diode is the first end of the combiner unit；
The cathode of the diode is the second end of the combiner unit.
6. inverter direct-flow side insulation resistance detection circuit according to claim 1, which is characterized in that the combiner unit
Including impedance.
7. inverter direct-flow side insulation resistance detection circuit according to claim 1, which is characterized in that the combiner unit
It include: diode and the impedance of series connection；
One end of the impedance is the first end of the combiner unit, the anode phase of the other end of the impedance and the diode
Even, the cathode of the diode is the second end of the combiner unit；Alternatively,
The anode of the diode is the first end of the combiner unit, one end phase of the cathode of the diode and the impedance
Even, the other end of the impedance is the second end of the combiner unit.
8. -7 any inverter direct-flow side insulation resistance detection circuit according to claim 1, which is characterized in that it is described just
Pole detection circuit is identical as the structure of the cathode detection circuit.
9. a kind of string type inverter characterized by comprising an inverter circuit, n MPPT input branch and as right is wanted
Any inverter direct-flow side insulation resistance detection circuit of 1-8 is sought, n is the positive integer greater than 1；Wherein:
The input terminal of n MPPT input branch is connected with n photovoltaic group string one-to-one correspondence respectively；
The output head anode of n MPPT input branch is connected, output bus anode of the tie point as n MPPT input branch,
It is connected with the DC side anode of the inverter circuit；
The negative pole of output end of n MPPT input branch is connected, output bus cathode of the tie point as n MPPT input branch,
It is connected with the DC side cathode of the inverter circuit.
10. string type inverter according to claim 9, which is characterized in that the MPPT input branch includes: filtered electrical
Road and symmetrical three level BOOST circuit；
The input terminal of the filter circuit is the input terminal that the MPPT inputs branch；
The output end of the filter circuit is connected with the low-pressure side of the symmetrical three level BOOST circuit；
The output head anode of the just extremely described MPPT input branch in the high-pressure side of the symmetrical three level BOOST circuit, it is described right
The high-pressure side cathode of three level BOOST circuits is referred to as the negative pole of output end of the MPPT input branch, symmetrical three level
The high-pressure side midpoint of BOOST circuit is the output end midpoint that the MPPT inputs branch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920180864.4U CN209559977U (en) | 2019-02-01 | 2019-02-01 | Inverter direct-flow side insulation resistance detection circuit and string type inverter |
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|---|---|---|---|
| CN201920180864.4U CN209559977U (en) | 2019-02-01 | 2019-02-01 | Inverter direct-flow side insulation resistance detection circuit and string type inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113138326A (en) * | 2021-05-12 | 2021-07-20 | 阳光电源股份有限公司 | Insulation detection system, insulation detection method and photovoltaic system |
| CN113138326B (en) * | 2021-05-12 | 2024-05-14 | 阳光电源股份有限公司 | Insulation detection system, insulation detection method and photovoltaic system |
-
2019
- 2019-02-01 CN CN201920180864.4U patent/CN209559977U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113138326A (en) * | 2021-05-12 | 2021-07-20 | 阳光电源股份有限公司 | Insulation detection system, insulation detection method and photovoltaic system |
| CN113138326B (en) * | 2021-05-12 | 2024-05-14 | 阳光电源股份有限公司 | Insulation detection system, insulation detection method and photovoltaic system |
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