CN204556734U - The insulation resistance detection device of photovoltaic combining inverter - Google Patents
The insulation resistance detection device of photovoltaic combining inverter Download PDFInfo
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- CN204556734U CN204556734U CN201520231448.4U CN201520231448U CN204556734U CN 204556734 U CN204556734 U CN 204556734U CN 201520231448 U CN201520231448 U CN 201520231448U CN 204556734 U CN204556734 U CN 204556734U
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Abstract
The utility model discloses the insulation resistance detection device of photovoltaic combining inverter, this insulation resistance detection device only arranges a switch to produce disturbing signal, and the branch road at this switch place is only in parallel with the partial ohmic in another branch road, the open-circuit voltage that switch bears is reduced with this, therefore the switch in insulation resistance detection device disclosed in the utility model can adopt withstand voltage lower switch, thus reduce the type selecting difficulty of switch, also reduce system cost simultaneously.
Description
Technical field
The utility model belongs to insulation impedance detection technique field, particularly relates to the insulation resistance detection device of photovoltaic combining inverter.
Background technology
Photovoltaic combining inverter is that the direct current that photovoltaic array exports is converted to alternating current and outputs to the device of electrical network.For the photovoltaic combining inverter of non-isolation type, before operation, must ensure that photovoltaic array has enough large insulation impedance between (GND) relative to the earth.Only have when photovoltaic array resistance value is relative to the earth higher than preset value, just allow the grid-connected work of photovoltaic combining inverter.
Application number be 201110378105.7 utility application disclose a kind of cell panel earth impedance testing circuit, Fig. 1 shows concrete structure, by controlling to reach testing goal to the folding of switch K1, K2 and K3.
But above-mentioned cell panel earth impedance testing circuit comprises multiple switch, and cause circuit structure comparatively complicated, and the cost of switch is higher, this causes system cost higher.In addition, multiple switch can bear whole open-circuit voltage at off state, therefore must select withstand voltage higher switch, which increases the type selecting difficulty of switch, can improve system cost further simultaneously.
Utility model content
In view of this, the purpose of this utility model is the insulation resistance detection device providing photovoltaic combining inverter, can reduce switch usage quantity, and reduces the type selecting difficulty of switch, thus reduces system cost.
For achieving the above object, the utility model provides following technical scheme:
The utility model discloses a kind of insulation resistance detection device of photovoltaic combining inverter, described photovoltaic combining inverter comprises M photovoltaic array, the negative pole of a described M photovoltaic array is connected to negative busbar, wherein M be greater than 1 integer, described insulation resistance detection device comprises M resistor assembly, the first branch road and the second branch road;
Be connected to a resistor assembly between the positive pole of each photovoltaic array and ground wire, wherein, a resistor assembly comprises the resistance of a resistance or multiple series connection;
Described first branch road is connected between described negative busbar and ground wire, described first branch road comprises the resistance of N1 series connection, wherein N1 be greater than 1 integer, a resistance in a described N1 resistance is sampling resistor, and described sampling resistor is connected with the control device of described photovoltaic combining inverter;
Described second branch road comprises resistance and the switch of series connection, and P1 resistor coupled in parallel in described second branch road and described first branch road, wherein P1 is the integer being less than N1.
Preferably, in above-mentioned insulation resistance detection device, a resistor coupled in parallel in described second branch road and described first branch road.
Preferably, in above-mentioned insulation resistance detection device, described first branch road comprises the first resistance, the second resistance, the 3rd resistance and sampling resistor, the first end of described first resistance is connected to described ground wire, and the second end of described first resistance is connected to described negative busbar by described second resistance, described 3rd resistance and described sampling resistor successively.
Preferably, in above-mentioned insulation resistance detection device, described first branch road comprises the 4th resistance, the 5th resistance and sampling resistor, the first end of described 4th resistance is connected to described ground wire, and the second end of described 4th resistance is connected to described negative busbar by described 5th resistance and described sampling resistor successively.
The utility model also discloses the insulation resistance detection device of another kind of photovoltaic combining inverter, described photovoltaic combining inverter comprises M photovoltaic array, the negative pole of a described M photovoltaic array is connected to negative busbar, wherein M be greater than 1 integer, described insulation resistance detection device comprises M resistor assembly, the 3rd branch road, the 4th branch road and the 5th branch road;
Be connected to a resistor assembly between the positive pole of each photovoltaic array and ground wire, wherein, a resistor assembly comprises the resistance of a resistance or multiple series connection;
Described 3rd branch road is connected between described ground wire and described negative busbar, described 3rd branch road comprise N2 series connection resistance, wherein N2 be greater than 1 integer;
Described 4th branch road comprises resistance and the switch of series connection, P2 resistor coupled in parallel in described 4th branch road and described 3rd branch road, and wherein P2 is the integer being less than N2;
Described 5th branch road is connected between described ground wire and described negative busbar, described 5th branch road comprises the resistance of N3 series connection, wherein N3 be greater than 1 integer, a resistance in a described N3 resistance is sampling resistor, and described sampling resistor is connected with the control device of described photovoltaic combining inverter.
Preferably, in above-mentioned insulation resistance detection device, a resistor coupled in parallel in described 4th branch road and described 3rd branch road.
The utility model also discloses the insulation resistance detection device of another kind of photovoltaic combining inverter, described photovoltaic combining inverter comprises M photovoltaic array, the positive pole of a described M photovoltaic array is connected to positive bus-bar, the negative pole of a described M photovoltaic array is connected to negative busbar, wherein M be greater than 1 integer, described insulation resistance detection device comprises:
Be connected to the resistor assembly between described positive bus-bar and ground wire, described resistor assembly comprises the resistance of a resistance or multiple series connection;
Be connected to the 6th branch road between described negative busbar and ground wire, described 6th branch road comprises the resistance of N4 series connection, wherein N4 be greater than 1 integer, a resistance in a described N4 resistance is sampling resistor, and described sampling resistor is connected with the control device of described photovoltaic combining inverter;
7th branch road, described 7th branch road comprises resistance and the switch of series connection, and P3 resistor coupled in parallel in described 7th branch road and described 6th branch road, wherein P3 is the integer being less than N4.
Preferably, in above-mentioned insulation resistance detection device, a resistor coupled in parallel in described 7th branch road and described 6th branch road.
The utility model also discloses the insulation resistance detection device of another kind of photovoltaic combining inverter, described photovoltaic combining inverter comprises M photovoltaic array, the positive pole of a described M photovoltaic array is connected to positive bus-bar, the negative pole of a described M photovoltaic array is connected to negative busbar, wherein M be greater than 1 integer, described insulation resistance detection device comprises:
Be connected to the resistor assembly between described positive bus-bar and ground wire, described resistor assembly comprises the resistance of a resistance or multiple series connection;
Be connected to the 8th branch road between described ground wire and described negative busbar, described 8th branch road comprise N5 series connection resistance, wherein N5 be greater than 1 integer;
9th branch road, described 9th branch road comprises resistance and the switch of series connection, P4 resistor coupled in parallel in described 9th branch road and described 8th branch road, and wherein P4 is the integer being less than N5;
Be connected to the tenth branch road between described ground wire and described negative busbar, described tenth branch road comprises the resistance of N6 series connection, wherein N6 be greater than 1 integer, a resistance in a described N6 resistance is sampling resistor, and described sampling resistor is connected with the control device of described photovoltaic combining inverter.
Preferably, in above-mentioned insulation resistance detection device, a resistor coupled in parallel in described 9th branch road and described 8th branch road.
As can be seen here, the insulation resistance detection device of photovoltaic combining inverter disclosed in the utility model, a switch is only set to produce disturbing signal, and the open-circuit voltage that this switch bears is lower, therefore withstand voltage lower switch can be used, reduce the type selecting difficulty of switch, also reduce system cost simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the structural representation of existing a kind of cell panel earth impedance testing circuit;
The structural representation of Fig. 2 a kind of insulation resistance detection device of photovoltaic DC-to-AC converter disclosed in the utility model;
The structural representation of Fig. 3 another kind of insulation resistance detection device of photovoltaic DC-to-AC converter disclosed in the utility model;
The structural representation of Fig. 4 another kind of insulation resistance detection device of photovoltaic DC-to-AC converter disclosed in the utility model;
The structural representation of Fig. 5 another kind of insulation resistance detection device of photovoltaic DC-to-AC converter disclosed in the utility model;
The structural representation of Fig. 6 another kind of insulation resistance detection device of photovoltaic DC-to-AC converter disclosed in the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model discloses a kind of insulation resistance detection device of photovoltaic combining inverter, and this photovoltaic combining inverter comprises M photovoltaic array, and the negative pole of M photovoltaic array is connected to negative busbar, M be greater than 1 integer.Wherein, photovoltaic array can be a photovoltaic battery panel, also can be connected by multiple photovoltaic battery panel and/or parallel connection is formed.This insulation resistance detection device comprises M resistor assembly, the first branch road and the second branch road.
Concrete: be connected to a resistor assembly between the positive pole of each photovoltaic array and ground wire, wherein, a resistor assembly comprises the resistance of a resistance or multiple series connection; First branch road is connected between negative busbar and ground wire, the first branch road comprise N1 series connection resistance, wherein N1 be greater than 1 integer, a resistance in N1 resistance is sampling resistor, and sampling resistor is connected with the control device of photovoltaic combining inverter; Second branch road comprises resistance and the switch of series connection, and P1 resistor coupled in parallel in the second branch road and the first branch road, wherein P1 is the integer being less than N1.
Be specifically described below in conjunction with Fig. 2 and Fig. 3.
See the structural representation of Fig. 2, Fig. 2 a kind of insulation resistance detection device of photovoltaic DC-to-AC converter disclosed in the utility model.Wherein, photovoltaic DC-to-AC converter comprises M photovoltaic array, and the negative pole of M photovoltaic array is connected to negative busbar, and that is the negative pole of M photovoltaic array is at negative busbar place short circuit, M be greater than 1 integer.This insulation resistance detection device comprises M resistor assembly, the first branch road 11 and the second branch road 12.
Wherein:
A resistor assembly is connected between the positive pole of each photovoltaic array and ground wire (representing with GND).In fig. 2, a resistance is only comprised for each resistor assembly, the positive pole of M photovoltaic array respectively with PV1+, PV2+ ... PVM+ represents, resistance Rp1 is connected with between the positive pole PV1+ and ground wire of the first photovoltaic array, resistance Rp2 is connected with between the positive pole PV2+ and ground wire of the second photovoltaic array, by that analogy, between the positive pole PVM+ and ground wire of M photovoltaic array, resistance RpM is connected with.
First branch road 11 is connected between negative busbar Bus-and ground wire, the first branch road comprise N1 series connection resistance, wherein N1 be greater than 1 integer, a resistance in N1 resistance is sampling resistor, and this sampling resistor is connected with the control device of photovoltaic combining inverter.In fig. 2, the first branch road 11 comprises the first resistance Rn1, the second resistance Rn2, the 3rd resistance Rn3 and sampling resistor Rs1.Wherein, the first end of the first resistance Rn1 is connected to ground wire, and second end of the first resistance Rn1 is connected to negative busbar Bus-by the second resistance Rn2, the 3rd resistance Rn3 and sampling resistor Rs1 successively, and sampling resistor Rs1 is connected with the control device of photovoltaic combining inverter.Certainly, Fig. 2 illustrate only a kind of structure of the first branch road 11, and in enforcement, in the first branch road 11, the quantity of resistance and the position of sampling resistor are not limited thereto, and hereafter will be described in conjunction with more embodiments.
Second branch road 12 comprises P1 resistor coupled in parallel in the resistance Rb1 of series connection and K switch 11, second branch road 12 and the first branch road 11, and wherein P1 is the integer being less than N1.That is the second branch road 12 is only in parallel with the partial ohmic in the first branch road 11, other resistance in first branch road 11 play dividing potential drop effect to the second branch road 12, reduce the open-circuit voltage that the K switch 11 in the second branch road 12 is born, to use withstand voltage lower switch, thus reduce the type selecting difficulty of K switch 11, also can reduce the cost that switch produces simultaneously.
Preferably, a resistor coupled in parallel in the second branch road 12 and the first branch road 11, can reduce the open-circuit voltage that the K switch 11 in the second branch road 12 is born so further.In fig. 2, the second branch road 12 is in parallel with the second resistance Rn2 in the first branch road 11.
Before photovoltaic combining inverter is incorporated into the power networks, the K switch 11 controlled in the second branch road 12 is in off state, control device in photovoltaic combining inverter obtains the magnitude of voltage at sampling resistor Rs1 two ends in the first branch road 11, afterwards, control device utilizes the resistance of each resistance in the magnitude of voltage at sampling resistor Rs1 two ends, voltage between the positive pole of each photovoltaic array and negative pole and insulation resistance detection device, calculates the parallel impedance of the impedance between the positive pole of each photovoltaic array and ground wire and the impedance between negative busbar and ground wire.If this parallel impedance is beyond preset range, determine that the insulation impedance of photovoltaic combining inverter is defective, if this parallel impedance is in preset range, the K switch 11 then controlled in the second branch road 12 is in closure state, control device obtains the magnitude of voltage at current state down-sampling resistance Rs1 two ends, afterwards, control device utilizes the magnitude of voltage at current state down-sampling resistance Rs1 two ends, voltage between the positive pole of each photovoltaic array and negative pole, and the resistance of each resistance in insulation resistance detection device, calculate the parallel impedance of the impedance between the positive pole of each photovoltaic array and ground wire and the impedance between negative busbar and ground wire, if this parallel impedance is in preset range, determine that the insulation impedance of photovoltaic combining inverter is normal, can be incorporated into the power networks, if this parallel impedance is beyond preset range, then determine that the insulation impedance of photovoltaic combining inverter is defective.
The insulation resistance detection device of photovoltaic combining inverter disclosed in the utility model, a switch is only set to produce disturbing signal, and the open-circuit voltage that this switch bears is lower, therefore can uses withstand voltage lower switch, reduce the type selecting difficulty of switch, also reduce system cost simultaneously.
In enforcement, in the insulation resistance detection device shown in Fig. 2, can also adjust the position of each resistance in the first branch road 11.Such as: the first end of the first resistance Rn1 is connected to ground wire, second end of the first resistance Rn1 is connected to negative busbar Bus-by the second resistance Rn2, sampling resistor Rs1 and the 3rd resistance Rn3 successively.
In enforcement, can also improve the structure of the first branch road.
See the structural representation of Fig. 3, Fig. 3 another kind of insulation resistance detection device of photovoltaic DC-to-AC converter disclosed in the utility model.Wherein, photovoltaic DC-to-AC converter comprises M photovoltaic array, and the negative pole of M photovoltaic array is connected to negative busbar, and that is the negative pole of M photovoltaic array is at negative busbar place short circuit, M be greater than 1 integer.This insulation resistance detection device comprises M resistor assembly, the first branch road 11 and the second branch road 12.
Wherein:
A resistor assembly is connected between the positive pole of each photovoltaic array and ground wire (representing with GND).In figure 3, a resistance is comprised for each resistor assembly, the positive pole of M photovoltaic array respectively with PV1+, PV2+ ... PVM+ represents, resistance Rp1 is connected with between the positive pole PV1+ and ground wire of the first photovoltaic array, resistance Rp2 is connected with between the positive pole PV2+ and ground wire of the second photovoltaic array, by that analogy, between the positive pole PVM+ and ground wire of M photovoltaic array, resistance RpM is connected with.
First branch road 11 is connected between negative busbar Bus-and ground wire, and the first branch road 11 comprises the 4th resistance Rn4, the 5th resistance Rn5 and sampling resistor Rs2.Wherein, the first end of the 4th resistance Rn4 is connected to ground wire, and second end of the 4th resistance Rn4 is connected to negative busbar Bus-by the 5th resistance Rn5 and sampling resistor Rs2 successively.
Second branch road 12 comprise the resistance Rb1 of series connection and K switch 11, second branch road 12 in parallel with the 5th resistance Rn5 in the first branch road 11.
In enforcement, 4th resistance Rn4 is configured to the larger resistance of resistance, 5th resistance Rn5 and sampling resistor Rs2 is configured to the less resistance of resistance, such one side can reduce the open-circuit voltage that the second branch road 12 breaker in middle K11 bears, and control device directly can gather the magnitude of voltage at sampling resistor Rs2 two ends on the other hand.
The insulation resistance detection device of the photovoltaic combining inverter shown in the utility model Fig. 3, compared with insulation resistance detection device shown in Fig. 2, decreases the resistance quantity in the first branch road, further simplify circuit structure, reduce further system cost simultaneously.
The utility model also discloses the insulation resistance detection device of another kind of photovoltaic combining inverter, this photovoltaic combining inverter comprises M photovoltaic array, the negative pole of M photovoltaic array is connected to negative busbar, wherein M be greater than 1 integer, this insulation resistance detection device comprises M resistor assembly, the 3rd branch road, the 4th branch road and the 5th branch road.
Concrete: be connected to a resistor assembly between the positive pole of each photovoltaic array and ground wire, one of them resistor assembly comprises the resistance of a resistance or multiple series connection; 3rd branch road is connected between ground wire and negative busbar, the 3rd branch road comprise N2 series connection resistance, wherein N2 be greater than 1 integer; 4th branch road comprises resistance and the switch of series connection, P2 resistor coupled in parallel in the 4th branch road and the 3rd branch road, and wherein P2 is the integer being less than N2; 5th branch road is connected between ground wire and negative busbar, the 5th branch road comprise N3 series connection resistance, wherein N3 be greater than 1 integer, a resistance in N3 resistance is sampling resistor, and sampling resistor is connected with the control device of photovoltaic combining inverter.
Preferably, a resistor coupled in parallel in the 4th branch road and the 3rd branch road.The open-circuit voltage that the 4th branch road breaker in middle bears can be reduced so further.
Be specifically described below in conjunction with Fig. 4.
See the structural representation of Fig. 4, Fig. 4 another kind of insulation resistance detection device of photovoltaic DC-to-AC converter disclosed in the utility model.Wherein, photovoltaic DC-to-AC converter comprises M photovoltaic array, and the negative pole of M photovoltaic array is connected to negative busbar, and that is the negative pole of M photovoltaic array is at negative busbar place short circuit, M be greater than 1 integer.This insulation resistance detection device comprises M resistor assembly, the 3rd branch road 13, the 4th branch road 14 and the 5th branch road 15.
Wherein:
A resistor assembly is connected between the positive pole of each photovoltaic array and ground wire (representing with GND).In the diagram, a resistance is comprised for each resistor assembly, the positive pole of M photovoltaic array respectively with PV1+, PV2+ ... PVM+ represents, resistance Rp1 is connected with between the positive pole PV1+ and ground wire of the first photovoltaic array, resistance Rp2 is connected with between the positive pole PV2+ and ground wire of the second photovoltaic array, by that analogy, between the positive pole PVM+ and ground wire of M photovoltaic array, resistance RpM is connected with.
3rd branch road 13 is connected between ground wire and negative busbar Bus-, and the 3rd branch road 13 comprises the 6th resistance Rn6, the 7th resistance Rn7 and the 8th resistance Rn8.Wherein, the first end of the 6th resistance Rn6 is connected to ground wire, and second end of the 6th resistance Rn6 is connected to negative busbar Bus-by the 7th resistance Rn7 and the 8th resistance Rn8 successively.Certainly, Fig. 4 illustrate only a kind of structure of the 3rd branch road 13, and in enforcement, in the 3rd branch road 13, the quantity of resistance is not limited thereto.
4th branch road 14 comprises the two ends that the resistance Rb1 of series connection and K switch the 11, four branch road 14 are connected in parallel on the 7th resistance Rn7 in the 3rd branch road 13.That is, the 4th branch road 14 is only in parallel with the partial ohmic in the 3rd branch road 13, and other resistance in the 3rd branch road 13 play dividing potential drop effect to the 4th branch road 14, reduces the open-circuit voltage that the K switch 11 in the 4th branch road 14 is born.
5th branch road 15 is connected between ground wire and negative busbar Bus-, and the 5th branch road 14 comprises the 9th resistance Rn9 and the sampling resistor Rs3 of series connection.Sampling resistor Rs3 is connected with the control device of photovoltaic combining inverter.Certainly, in the 5th branch road 15, the quantity of resistance is not limited to shown in Fig. 4.In order to ensure that control device directly can gather the magnitude of voltage at sampling resistor two ends, sampling resistor can be configured to the less resistance of resistance, and other resistance in the 5th branch road 15 can be configured to the larger resistance of resistance.
Before photovoltaic combining inverter is incorporated into the power networks, the K switch 11 controlled in the 4th branch road 14 is in off state, control device in photovoltaic combining inverter obtains the magnitude of voltage at sampling resistor Rs3 two ends in the 5th branch road 15, afterwards, control device utilizes the resistance of each resistance in the magnitude of voltage at sampling resistor Rs3 two ends, voltage between the positive pole of each photovoltaic array and negative pole and insulation resistance detection device, calculates the parallel impedance of the impedance between the positive pole of each photovoltaic array and ground wire and the impedance between negative busbar and ground wire.If this parallel impedance is beyond preset range, determine that the insulation impedance of photovoltaic combining inverter is defective, if this parallel impedance is in preset range, then the K switch 11 controlled in the 4th branch road 14 is in closure state, control device obtains the magnitude of voltage at current state down-sampling resistance Rs3 two ends, afterwards, control device utilizes the magnitude of voltage at current state down-sampling resistance Rs3 two ends, voltage between the positive pole of each photovoltaic array and negative pole, and the resistance of each resistance in insulation resistance detection device, calculate the parallel impedance of the impedance between the positive pole of each photovoltaic array and ground wire and the impedance between negative busbar and ground wire, if this parallel impedance is in preset range, determine that the insulation impedance of photovoltaic combining inverter is normal, can be incorporated into the power networks, if this parallel impedance is beyond preset range, then determine that the insulation impedance of photovoltaic combining inverter is defective.
The insulation resistance detection device of the photovoltaic combining inverter shown in the utility model Fig. 4, a switch is only set to produce disturbing signal, and the open-circuit voltage that this switch bears is lower, therefore withstand voltage lower switch can be used, reduce the type selecting difficulty of switch, also reduce system cost simultaneously.
The utility model also discloses the insulation resistance detection device of another kind of photovoltaic combining inverter, this photovoltaic combining inverter comprises M photovoltaic array, the positive pole of M photovoltaic array is connected to positive bus-bar, the negative pole of M photovoltaic array is connected to negative busbar, wherein M be greater than 1 integer, this insulation resistance detection device comprises:
Be connected to the resistor assembly between positive bus-bar and ground wire, this resistor assembly comprises the resistance of one or more series connection;
Be connected to the 6th branch road between negative busbar and ground wire, the 6th branch road comprise N4 series connection resistance, wherein N4 be greater than 1 integer, a resistance in N4 resistance is sampling resistor, and sampling resistor is connected with the control device of photovoltaic combining inverter;
7th branch road, the 7th branch road comprises resistance and the switch of series connection, and P3 resistor coupled in parallel in the 7th branch road and the 6th branch road, wherein P3 is the integer being less than N4.
Preferably, a resistor coupled in parallel in the 7th branch road and the 6th branch road.The open-circuit voltage that the 7th branch road breaker in middle bears can be reduced so further.
Be specifically described below in conjunction with Fig. 5.
See the structural representation of Fig. 5, Fig. 5 another kind of insulation resistance detection device of photovoltaic DC-to-AC converter disclosed in the utility model.Wherein, photovoltaic DC-to-AC converter comprises M photovoltaic array, and the positive pole of M photovoltaic array is connected to positive bus-bar Bus+, and the negative pole of M photovoltaic array is connected to negative busbar Bus-, M be greater than 1 integer.This insulation resistance detection device comprises: be connected to the resistor assembly between positive bus-bar Bus+ and ground wire GND, is specially resistance Rp, the 6th branch road 16 and the 7th branch road 17 here.
6th branch road 16 is connected between ground wire and negative busbar Bus-, and the 6th branch road 13 comprises the tenth resistance Rn10, the 11 resistance Rn11 and sampling resistor Rs4.Wherein, the first end of the tenth resistance Rn10 is connected to ground wire, and second end of the tenth resistance Rn10 is connected to negative busbar Bus-by the 11 resistance Rn11 and sampling resistor Rs4 successively.Meanwhile, sampling resistor Rs4 is also connected with the control device of photovoltaic combining inverter.It should be noted that, Fig. 5 illustrate only a kind of structure of the 6th branch road 16, and in enforcement, in the 6th branch road 16, the quantity of resistance and the position of sampling resistor are not limited thereto.
7th branch road 17 comprise the resistance Rb1 of series connection and K switch the 11, seven branch road 17 in parallel with the 11 resistance Rn11 in the 6th branch road 16.Certainly, in enforcement, the 7th branch road 17 can with other one or more resistor coupled in parallel in the 6th branch road 16, are only the partial ohmic in the 6th branch road 16 as long as in parallel with the 7th branch road 17.
Before photovoltaic combining inverter is incorporated into the power networks, the K switch 11 controlled in the 7th branch road 17 is in off state, control device in photovoltaic combining inverter obtains the magnitude of voltage at sampling resistor Rs4 two ends in the 6th branch road 15, afterwards, control device utilizes the resistance of each resistance in the magnitude of voltage at sampling resistor Rs4 two ends, the magnitude of voltage between positive bus-bar and negative busbar and insulation resistance detection device, calculates the parallel impedance of the impedance between positive bus-bar and ground wire and the impedance between negative busbar and ground wire.If this parallel impedance is beyond preset range, determine that the insulation impedance of photovoltaic combining inverter is defective, if this parallel impedance is in preset range, then the K switch 11 controlled in the 7th branch road 14 is in closure state, control device obtains the magnitude of voltage at current state down-sampling resistance Rs4 two ends, afterwards, control device utilizes the magnitude of voltage at current state down-sampling resistance Rs4 two ends, magnitude of voltage between positive bus-bar and negative busbar, and the resistance of each resistance in insulation resistance detection device, calculate the parallel impedance of the impedance between positive bus-bar and ground wire and the impedance between negative busbar and ground wire, if this parallel impedance is in preset range, determine that the insulation impedance of photovoltaic combining inverter is normal, can be incorporated into the power networks, if this parallel impedance is beyond preset range, then determine that the insulation impedance of photovoltaic combining inverter is defective.
The insulation resistance detection device of the photovoltaic combining inverter shown in the utility model Fig. 5, that a switch is only set to produce disturbing signal equally, and the open-circuit voltage that this switch bears is lower, therefore withstand voltage lower switch can be used, reduce the type selecting difficulty of switch, also reduce system cost simultaneously.
The utility model also discloses the insulation resistance detection device of another kind of photovoltaic combining inverter, this photovoltaic combining inverter comprises M photovoltaic array, the positive pole of M photovoltaic array is connected to positive bus-bar, the negative pole of M photovoltaic array is connected to negative busbar, wherein M be greater than 1 integer, this insulation resistance detection device comprises:
Be connected to the resistor assembly between positive bus-bar and ground wire, this resistor assembly comprises the resistance of a resistance or multiple series connection;
Be connected to the 8th branch road between ground wire and negative busbar, the 8th branch road comprise N5 series connection resistance, wherein N5 be greater than 1 integer;
9th branch road, the 9th branch road comprises resistance and the switch of series connection, P4 resistor coupled in parallel in the 9th branch road and the 8th branch road, and wherein P4 is the integer being less than N5;
Be connected to the tenth branch road between ground wire and negative busbar, the tenth branch road comprise N6 series connection resistance, wherein N6 be greater than 1 integer, a resistance in N6 resistance is sampling resistor, and sampling resistor is connected with the control device of photovoltaic combining inverter.
Preferably, a resistor coupled in parallel in the 9th branch road and the 8th branch road.The open-circuit voltage that the 9th branch road breaker in middle bears can be reduced so further.
Be specifically described below in conjunction with Fig. 6.
See the structural representation of Fig. 6, Fig. 6 another kind of insulation resistance detection device of photovoltaic DC-to-AC converter disclosed in the utility model.Wherein, photovoltaic DC-to-AC converter comprises M photovoltaic array, and the positive pole of M photovoltaic array is connected to positive bus-bar Bus+, and the negative pole of M photovoltaic array is connected to negative busbar Bus-, M be greater than 1 integer.This insulation resistance detection device comprises: be connected to the resistor assembly between positive bus-bar Bus+ and ground wire GND, is specially resistance Rp, the 8th branch road 18, the 9th branch road 19 and the tenth branch road 110 here.
8th branch road 18 is connected between ground wire and negative busbar Bus-, and the 8th branch road 18 comprises the 12 resistance Rn12, the 13 resistance Rn13 and the 14 resistance Rn14.Wherein, the first end of the 12 resistance Rn12 is connected to ground wire, and second end of the 12 resistance Rn12 is connected to negative busbar Bus-by the 13 resistance Rn13 and the 14 resistance Rn14 successively.Certainly, Fig. 6 illustrate only a kind of structure of the 8th branch road 18, and in enforcement, in the 8th branch road 18, the quantity of resistance is not limited thereto.
9th branch road 19 comprises the two ends that the resistance Rb1 of series connection and K switch the 11, nine branch road 19 are connected in parallel on the 13 resistance Rn13 in the 8th branch road 18.That is, the 9th branch road 19 is only in parallel with the partial ohmic in the 8th branch road 18, and other resistance in the 8th branch road 18 play dividing potential drop effect to the 9th branch road 19, reduces the open-circuit voltage that the K switch 11 in the 9th branch road 19 is born.Certainly, in enforcement, the 9th branch road 19 can with other one or more resistor coupled in parallel in the 8th branch road 18, are only the partial ohmic in the 8th branch road 18 as long as in parallel with the 9th branch road 19.
Tenth branch road 110 is connected between ground wire and negative busbar Bus-, and the tenth branch road 110 comprises the 15 resistance Rn15 and the sampling resistor Rs5 of series connection.Sampling resistor Rs5 is connected with the control device of photovoltaic combining inverter.Certainly, in the tenth branch road 110, the quantity of resistance is not limited to shown in Fig. 6.In order to ensure that control device directly can gather the magnitude of voltage at sampling resistor two ends, sampling resistor can be configured to the less resistance of resistance, and other resistance in the tenth branch road 110 can be configured to the larger resistance of resistance.
The control device of photovoltaic combining inverter is according to the resistance value of K switch 11 at off state and closure state down-sampling resistance Rs5 two ends, magnitude of voltage between positive bus-bar and negative busbar, and the resistance of each resistance in insulation resistance detection device, calculate the parallel impedance of the impedance between twice positive bus-bar and ground wire and the impedance between negative busbar and ground wire, if the parallel impedance calculated for twice is all in preset range, determine that the insulation impedance of photovoltaic combining inverter is normal, can be incorporated into the power networks, otherwise determine that the insulation impedance of photovoltaic combining inverter is defective.
Each insulation resistance detection device of the above-mentioned disclosed photovoltaic combining inverter of the utility model, a switch is only set to produce disturbing signal, and the branch road at this switch place is only in parallel with the partial ohmic in another branch road, the open-circuit voltage that switch bears is reduced with this, therefore the switch in insulation resistance detection device disclosed in the utility model can adopt withstand voltage lower switch, thus reduce the type selecting difficulty of switch, also reduce system cost simultaneously.
Switch in the utility model can be the semiconductor devices such as transistor, field effect transistor, IGBT (insulated gate bipolar transistor), disconnector, optocoupler, also can be the Electromagnetic Control devices such as relay.For relay, the cost of the withstand voltage relay for 1000V is 16 yuan, and the cost of the withstand voltage relay for 500V is only 3 yuan.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. the insulation resistance detection device of a photovoltaic combining inverter, described photovoltaic combining inverter comprises M photovoltaic array, the negative pole of a described M photovoltaic array is connected to negative busbar, wherein M be greater than 1 integer, it is characterized in that, described insulation resistance detection device comprises M resistor assembly, the first branch road and the second branch road;
Be connected to a resistor assembly between the positive pole of each photovoltaic array and ground wire, wherein, a resistor assembly comprises the resistance of a resistance or multiple series connection;
Described first branch road is connected between described negative busbar and ground wire, described first branch road comprises the resistance of N1 series connection, wherein N1 be greater than 1 integer, a resistance in a described N1 resistance is sampling resistor, and described sampling resistor is connected with the control device of described photovoltaic combining inverter;
Described second branch road comprises resistance and the switch of series connection, and P1 resistor coupled in parallel in described second branch road and described first branch road, wherein P1 is the integer being less than N1.
2. insulation resistance detection device according to claim 1, is characterized in that, a resistor coupled in parallel in described second branch road and described first branch road.
3. insulation resistance detection device according to claim 1 and 2, it is characterized in that, described first branch road comprises the first resistance, the second resistance, the 3rd resistance and sampling resistor, the first end of described first resistance is connected to described ground wire, and the second end of described first resistance is connected to described negative busbar by described second resistance, described 3rd resistance and described sampling resistor successively.
4. insulation resistance detection device according to claim 1 and 2, it is characterized in that, described first branch road comprises the 4th resistance, the 5th resistance and sampling resistor, the first end of described 4th resistance is connected to described ground wire, and the second end of described 4th resistance is connected to described negative busbar by described 5th resistance and described sampling resistor successively.
5. the insulation resistance detection device of a photovoltaic combining inverter, described photovoltaic combining inverter comprises M photovoltaic array, the negative pole of a described M photovoltaic array is connected to negative busbar, wherein M be greater than 1 integer, it is characterized in that, described insulation resistance detection device comprises M resistor assembly, the 3rd branch road, the 4th branch road and the 5th branch road;
Be connected to a resistor assembly between the positive pole of each photovoltaic array and ground wire, wherein, a resistor assembly comprises the resistance of a resistance or multiple series connection;
Described 3rd branch road is connected between described ground wire and described negative busbar, described 3rd branch road comprise N2 series connection resistance, wherein N2 be greater than 1 integer;
Described 4th branch road comprises resistance and the switch of series connection, P2 resistor coupled in parallel in described 4th branch road and described 3rd branch road, and wherein P2 is the integer being less than N2;
Described 5th branch road is connected between described ground wire and described negative busbar, described 5th branch road comprises the resistance of N3 series connection, wherein N3 be greater than 1 integer, a resistance in a described N3 resistance is sampling resistor, and described sampling resistor is connected with the control device of described photovoltaic combining inverter.
6. insulation resistance detection device according to claim 5, is characterized in that, a resistor coupled in parallel in described 4th branch road and described 3rd branch road.
7. the insulation resistance detection device of a photovoltaic combining inverter, described photovoltaic combining inverter comprises M photovoltaic array, the positive pole of a described M photovoltaic array is connected to positive bus-bar, the negative pole of a described M photovoltaic array is connected to negative busbar, wherein M be greater than 1 integer, it is characterized in that, described insulation resistance detection device comprises:
Be connected to the resistor assembly between described positive bus-bar and ground wire, described resistor assembly comprises the resistance of a resistance or multiple series connection;
Be connected to the 6th branch road between described negative busbar and ground wire, described 6th branch road comprises the resistance of N4 series connection, wherein N4 be greater than 1 integer, a resistance in a described N4 resistance is sampling resistor, and described sampling resistor is connected with the control device of described photovoltaic combining inverter;
7th branch road, described 7th branch road comprises resistance and the switch of series connection, and P3 resistor coupled in parallel in described 7th branch road and described 6th branch road, wherein P3 is the integer being less than N4.
8. insulation resistance detection device according to claim 7, is characterized in that, a resistor coupled in parallel in described 7th branch road and described 6th branch road.
9. the insulation resistance detection device of a photovoltaic combining inverter, described photovoltaic combining inverter comprises M photovoltaic array, the positive pole of a described M photovoltaic array is connected to positive bus-bar, the negative pole of a described M photovoltaic array is connected to negative busbar, wherein M be greater than 1 integer, it is characterized in that, described insulation resistance detection device comprises:
Be connected to the resistor assembly between described positive bus-bar and ground wire, described resistor assembly comprises the resistance of a resistance or multiple series connection;
Be connected to the 8th branch road between described ground wire and described negative busbar, described 8th branch road comprise N5 series connection resistance, wherein N5 be greater than 1 integer;
9th branch road, described 9th branch road comprises resistance and the switch of series connection, P4 resistor coupled in parallel in described 9th branch road and described 8th branch road, and wherein P4 is the integer being less than N5;
Be connected to the tenth branch road between described ground wire and described negative busbar, described tenth branch road comprises the resistance of N6 series connection, wherein N6 be greater than 1 integer, a resistance in a described N6 resistance is sampling resistor, and described sampling resistor is connected with the control device of described photovoltaic combining inverter.
10. insulation resistance detection device according to claim 9, is characterized in that, a resistor coupled in parallel in described 9th branch road and described 8th branch road.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105548712A (en) * | 2015-12-21 | 2016-05-04 | 珠海格力电器股份有限公司 | Inverter, square matrix insulation impedance detection system, method and calculating unit thereof |
| CN106093590A (en) * | 2016-08-25 | 2016-11-09 | 安徽赛新电源科技有限公司 | Photovoltaic combining inverter multichannel input array impedance ground testing circuit and method |
| CN112083229A (en) * | 2020-09-04 | 2020-12-15 | 爱士惟新能源技术(江苏)有限公司 | Ground insulation impedance detection circuit and method of photovoltaic inverter |
| CN112327055A (en) * | 2020-11-09 | 2021-02-05 | 爱士惟新能源技术(扬中)有限公司 | Insulation impedance detection circuit and method for photovoltaic inverter |
| CN112595895A (en) * | 2020-12-02 | 2021-04-02 | 爱士惟新能源技术(江苏)有限公司 | Insulation impedance detection circuit and method of photovoltaic inverter |
| CN114295895A (en) * | 2021-12-30 | 2022-04-08 | 深圳市禾望科技有限公司 | Time-sharing multiplexing multi-level circuit and insulation impedance detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105548712A (en) * | 2015-12-21 | 2016-05-04 | 珠海格力电器股份有限公司 | Inverter, square matrix insulation impedance detection system, method and calculating unit thereof |
| CN105548712B (en) * | 2015-12-21 | 2018-07-06 | 珠海格力电器股份有限公司 | Inverter and its square formation insulation impedance detecting system, method and computing unit |
| CN106093590A (en) * | 2016-08-25 | 2016-11-09 | 安徽赛新电源科技有限公司 | Photovoltaic combining inverter multichannel input array impedance ground testing circuit and method |
| CN112083229A (en) * | 2020-09-04 | 2020-12-15 | 爱士惟新能源技术(江苏)有限公司 | Ground insulation impedance detection circuit and method of photovoltaic inverter |
| CN112083229B (en) * | 2020-09-04 | 2023-04-11 | 爱士惟科技股份有限公司 | Ground insulation impedance detection circuit and method of photovoltaic inverter |
| CN112327055A (en) * | 2020-11-09 | 2021-02-05 | 爱士惟新能源技术(扬中)有限公司 | Insulation impedance detection circuit and method for photovoltaic inverter |
| CN112327055B (en) * | 2020-11-09 | 2024-05-14 | 爱士惟新能源技术(扬中)有限公司 | Insulation impedance detection circuit and method for photovoltaic inverter |
| CN112595895A (en) * | 2020-12-02 | 2021-04-02 | 爱士惟新能源技术(江苏)有限公司 | Insulation impedance detection circuit and method of photovoltaic inverter |
| CN114295895A (en) * | 2021-12-30 | 2022-04-08 | 深圳市禾望科技有限公司 | Time-sharing multiplexing multi-level circuit and insulation impedance detection method |
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