CN106997008A - A kind of insulation detection device and inverter - Google Patents
A kind of insulation detection device and inverter Download PDFInfo
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- CN106997008A CN106997008A CN201710398983.2A CN201710398983A CN106997008A CN 106997008 A CN106997008 A CN 106997008A CN 201710398983 A CN201710398983 A CN 201710398983A CN 106997008 A CN106997008 A CN 106997008A
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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
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
Abstract
The present invention provides a kind of insulation detection device and inverter, by the control end for outputing control signals to boost conversion circuit, to control boost conversion circuit to work, DC bus-bar voltage is raised, and calculates the insulation impedance for obtaining photovoltaic array in photovoltaic generating system according to detection voltage after DC bus-bar voltage is increased to expectation voltage；And the insulation detection device is connected between dc bus both positive and negative polarity and ground, it detects that voltage will change with DC bus-bar voltage equal proportion；After DC bus-bar voltage is raised, it is used for the detection voltage equal proportion rise calculated.Therefore, even if the insulation impedance of photovoltaic array negative pole is smaller or photovoltaic array both positive and negative polarity between voltage it is smaller, can also calculate the insulation impedance that obtain photovoltaic array according to the detection voltage after rise, it is to avoid the problem of Insulation monitoring error is big in the prior art.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly to a kind of insulation detection device and inverter.
Background technology
During parallel network power generation, if the resistance of the insulation against ground resistance of photovoltaic array is less than certain index request
Or insulation resistance failure, with regard to the personal safety of entail dangers to photovoltaic power generation equipment or user.Accordingly, it would be desirable to grid-connected in photovoltaic array
The preceding insulaion resistance to photovoltaic array is detected.
In the prior art generally use unbalanced electric bridge as shown in Figure 1, wherein, Vpv be photovoltaic array positive pole PV+ and
Voltage between negative pole PV-, Viso is earth point PE to the voltage between photovoltaic array negative pole PV-.Pass through resistance (R+, R-, R1
And R2) partial pressure can obtain Viso and Vpv sizes relational expression, and two relational expressions before and after simultaneous switch K1 disturbances, you can solution
PV+ to the impedance R- of PE impedance R+ and PV- to PE.
But when R- is smaller or during Vpv smaller, because Vpv and R1 are constant, then Viso voltage differences before and after switch K1 disturbances
Not less, or before disturbance and after disturbance Viso is smaller, and the application condition now detected is big, can cause inverter protection by mistake
Or do not protect.
The content of the invention
The present invention provides a kind of insulation detection device and inverter, to solve the problem of detection error is big in the prior art.
To achieve the above object, the technical scheme that the application is provided is as follows：
A kind of insulation detection device, be arranged at photovoltaic generating system inverter circuit and at least one boost conversion circuit it
Between；The port of the insulation detection device includes：First end, the second end, the 3rd end and the 4th end；Wherein：
The first end is connected with dc bus positive pole；
Second end is connected with dc bus negative pole；
The 3rd end ground connection；
4th end is connected with the control end of the boost conversion circuit；
The insulation detection device is used for the control end for outputing control signals to the boost conversion circuit, described to control
Boost conversion circuit works, and raises DC bus-bar voltage, and according to detection after DC bus-bar voltage is increased to expectation voltage
Voltage calculates the insulation impedance for obtaining photovoltaic array in photovoltaic generating system.
It is preferred that, the insulation detection device includes：First resistor, second resistance, voltage detecting circuit and processor；Its
In：
The first resistor is arranged between the first end and the 3rd end；
The second resistance is arranged between second end and the 3rd end；
Two inputs of the voltage detecting circuit are connected with second end and the 3rd end respectively；
The output end output of the voltage detecting circuit is described to be detected voltage, is connected with the input of the processor；
First output end of the processor is connected with the 4th end；
The processor is used to export the control signal, to control the boost conversion circuit to work, makes dc bus
Voltage is raised, and after DC bus-bar voltage is increased to expect voltage, according to the voltage detecting under different DC bus-bar voltages
The detection voltage of circuit output, calculates the insulation impedance for obtaining photovoltaic array in photovoltaic generating system.
It is preferred that, the processor is additionally operable to：Before the control signal is exported, if the DC bus-bar voltage detected
Equal to the maximum allowable input voltage of inverter, then after the DC bus-bar voltage to be checked measured declines, further according to different dc bus
The detection voltage of the voltage detecting circuit output, calculates the insulation for obtaining photovoltaic array in photovoltaic generating system under voltage
Impedance.
It is preferred that, the insulation detection device includes：Switch, first resistor, second resistance, voltage detecting circuit and processing
Device；Wherein：
The switch and the first resistor are arranged in series between the first end and the 3rd end；
The second resistance is arranged between second end and the 3rd end；
Two inputs of the voltage detecting circuit are connected with second end and the 3rd end respectively；
The output end output of the voltage detecting circuit is described to be detected voltage, is connected with the input of the processor；
First output end of the processor is connected with the 4th end；
Second output end of the processor is connected with the control end of the switch；
The processor is used to control the switch conduction or shut-off, and exports the control signal, to control the liter
Translation circuit work is pressed, DC bus-bar voltage is raised；After DC bus-bar voltage is increased to the expectation voltage, according to described
The detection voltage of the voltage detecting circuit output under switch conduction and shut-off, calculating obtains photovoltaic in photovoltaic generating system
The insulation impedance of array.
It is preferred that, the insulation detection device includes：Switch, first resistor, second resistance, voltage detecting circuit and processing
Device；Wherein：
The first resistor is arranged between the first end and the 3rd end；
The switch and the second resistance are arranged in series between second end and the 3rd end；
Two inputs of the voltage detecting circuit are connected with second end and the 3rd end respectively；
The output end output of the voltage detecting circuit is described to be detected voltage, is connected with the input of the processor；
First output end of the processor is connected with the 4th end；
Second output end of the processor is connected with the control end of the switch；
The processor is used to control the switch conduction or shut-off, and exports the control signal, to control the liter
Translation circuit work is pressed, DC bus-bar voltage is raised；After DC bus-bar voltage is increased to the expectation voltage, according to described
The detection voltage of the voltage detecting circuit output under switch conduction and shut-off, calculating obtains photovoltaic in photovoltaic generating system
The insulation impedance of array.
It is preferred that, the processor is additionally operable to：Before the control signal is exported, if the DC bus-bar voltage detected
More than or equal to the expectation voltage, then directly according to the institute that the voltage detecting circuit is exported under the switch conduction and shut-off
Detection voltage is stated, the insulation impedance for obtaining photovoltaic array in photovoltaic generating system is calculated.
It is preferred that, the processor is integrated in the controller in inverter；Or, the processor be based on single-chip microcomputer or
The digital signal processor DSP of person's arm processor.
It is preferred that, the voltage detecting circuit is analog-digital converter ADC.
A kind of inverter, including：Inverter circuit and any of the above-described described insulation detection device.
It is preferred that, in addition to：At least one boost conversion circuit.
The insulation detection device that the present invention is provided, by outputing control signals to the control end of boost conversion circuit,
To control boost conversion circuit to work, raise DC bus-bar voltage, and the root after DC bus-bar voltage is increased to expectation voltage
The insulation impedance for obtaining photovoltaic array in photovoltaic generating system is calculated according to detection voltage；And the insulation detection device is connected to direct current
Between bus both positive and negative polarity and ground, it detects that voltage will change with DC bus-bar voltage equal proportion；After DC bus-bar voltage is raised,
It is used for the detection voltage equal proportion rise calculated.Therefore, even if the insulation impedance of photovoltaic array negative pole is smaller or photovoltaic battle array
Voltage is smaller between row both positive and negative polarity, and the insulation impedance for obtaining photovoltaic array can be also calculated according to the detection voltage after rise, is kept away
The problem of Insulation monitoring error is big is in the prior art exempted from.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly or in prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, the accompanying drawing in description is only this below
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the equivalent circuit diagram for the insulation detection device that prior art is provided；
Fig. 2 is the structural representation of insulation detection device provided in an embodiment of the present invention；
Fig. 3 is the structural representation for the insulation detection device that another embodiment of the present invention is provided；
Fig. 4 is the equivalent circuit diagram for the insulation detection device that another embodiment of the present invention is provided；
Fig. 5 is the structural representation for the insulation detection device that another embodiment of the present invention is provided；
Fig. 6 is the equivalent circuit diagram for the insulation detection device that another embodiment of the present invention is provided；
Fig. 7 is the structural representation for the insulation detection device that another embodiment of the present invention is provided；
Fig. 8 is the equivalent circuit diagram for the insulation detection device that another embodiment of the present invention is provided；
Fig. 9 is the structural representation for the insulation detection device that another embodiment of the present invention is provided.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the application protection.
The present invention provides a kind of insulation detection device, to solve the problem of detection error is big in the prior art.
Referring to Fig. 2, the insulation detection device is arranged at the inverter circuit and at least one boosting inverter of photovoltaic generating system
Between circuit；The output end of boost conversion circuit is connected with inverter circuit DC side, and the voltage at tie point is dc bus
Voltage；The inverter of photovoltaic generating system can be three-phase inverter or single-phase inverter；When the inverter is inverse for group string data
When becoming device, the boost conversion circuit can may be contained within inverter internal with inverter circuit and its controller；Or, the boosting becomes
Changing circuit can also be arranged at outside inverter, be not specifically limited herein.Also, the number of boost conversion circuit can also root
Depending on specific application environment, also it is not specifically limited herein.
Specifically, as shown in Fig. 2 the port of the insulation detection device includes：First end, the second end, the 3rd end and the 4th
End；Wherein：
First end is connected with dc bus positive pole BUS+；
Second end is connected with dc bus negative pole BUS-；
3rd end is grounded PE；
4th end is connected with the control end of boost conversion circuit；
The insulation detection device is used for the control end for outputing control signals to boost conversion circuit, to control boosting inverter electricity
Road works, and makes DC bus-bar voltage be increased to expect voltage Vp, and the basis after DC bus-bar voltage is increased to expectation voltage Vp
Detection voltage calculates the insulation impedance for obtaining photovoltaic array in photovoltaic generating system.
Preferably, it is expected that voltage Vp is less than or equal to system maximum open circuit voltage, preferably system maximum open circuit voltage.
The specific works of the insulation detection device are：
Before grid-connected inverters, control boost conversion circuit boosting, after DC bus-bar voltage rise, then by implementing
Disturbance, the detection voltage before and after being disturbed；Then by the internal circuit configuration of two detection voltages and the insulation detection device
Between relation, Simultaneous Equations calculate and obtain the insulation impedance of photovoltaic array, i.e. photovoltaic array component PV+ PE over the ground resistance
Anti- R+ and photovoltaic array negative pole PV- PE impedance R- over the ground parallel value.
The insulation detection device that the present embodiment is provided, due to being connected between dc bus both positive and negative polarity and ground, it is detected
Voltage will change with DC bus-bar voltage equal proportion；After DC bus-bar voltage is increased to expect voltage Vp, it is used for what is calculated
Detect the rise of voltage equal proportion.Therefore, even if the insulation impedance of photovoltaic array negative pole is smaller or photovoltaic array both positive and negative polarity between
Voltage is smaller, can also be calculated according to the detection voltage after rise and obtain the insulation impedance of photovoltaic array, it is to avoid prior art
The problem of middle Insulation monitoring error is big.
Another embodiment of the present invention additionally provides a kind of specific insulation detection device, in above-described embodiment and Fig. 2 base
On plinth, the insulation detection device as shown in figure 3, including：First resistor R1, second resistance R2, voltage detecting circuit 101 and place
Manage device 102；Wherein：
First resistor R1 is arranged between first end and the 3rd end, i.e., respectively with dc bus positive pole BUS+ and ground PE phases
Even；
Second resistance R2 is arranged between the second end and the 3rd end, i.e., respectively with dc bus negative pole BUS- and ground PE phases
Even；
Two inputs of voltage detecting circuit 101 are connected with the second end and the 3rd end respectively, i.e., respectively with dc bus
Negative pole BUS- and ground PE is connected；
The output end of voltage detecting circuit 101 is connected with the input of processor 102, for exporting detection voltage for processing
Device 102 is calculated；
First output end of processor 102 first is opened by the 4th end and the control end of boost conversion circuit, namely in Fig. 3
The control end for closing pipe Q1 is connected；
Processor 102 is used for output control signal, to control boost conversion circuit to work, raises DC bus-bar voltage,
And after DC bus-bar voltage is increased to expect voltage, exported according to voltage detecting circuit 101 under different DC bus-bar voltages
Voltage is detected, the insulation impedance for obtaining photovoltaic array in photovoltaic generating system is calculated.
Specifically operation principle is：
It is electric on photovoltaic array positive pole PV+ first to electric on inverter referring to Fig. 3, before grid-connected inverters, pass through processor
102 control boost conversion circuits boost to Vp1, after electric capacity C1 both end voltages are stable, under being detected by voltage detecting circuit 101
Bridge arm voltage is VISO1.Then, booster circuit is controlled to boost to V by processor 102p2, then detected by voltage detecting circuit 101
Lower bridge arm voltage is obtained for VISO2。
Fig. 4 is the equivalent resistance circuit shown in Fig. 3, can be obtained according to Circuit Theorem：
Simultaneous formula (1), formula (2) can solve the total insulaion resistance R+ //R- of photovoltaic array both positive and negative polarity over the ground：
By formula (1), formula (2) can equally calculate voltage detecting circuit 101 output the voltage of detection twice be respectively：
From formula (4), formula (5), as DC bus-bar voltage Vp1、Vp2During increase, voltage V is detectedISO1、VISO2Increase
Greatly, same oversampling ratio enters processor 102, and DC bus-bar voltage is bigger, and sampling precision is higher, therefore solves prior art
The problem of detection error is big.
Especially, when the voltage of actual photovoltaic array input is equal to the maximum voltage of system, then do not boost, now straight
It is also the maximum allowable input voltage of inverter to flow busbar voltage, now, and corresponding lower bridge arm voltage is VISO1；Treat photovoltaic electric array
Input voltage changes, and DC bus-bar voltage is less than the maximum allowable input voltage of inverter, and thus corresponding lower bridge arm voltage is
VISO2；The exhausted of photovoltaic array both positive and negative polarity total insulaion resistance R+ over the ground //R-, i.e. photovoltaic array can be solved further according to formula (3)
Edge impedance.
Or, referring to Fig. 5, the insulation detection device includes：Switch K, first resistor R1, second resistance R2, voltage detecting
Circuit 101 and processor 102；Wherein：
Switch K and first resistor R1 be arranged in series between first end and the 3rd end, i.e., respectively with dc bus positive pole BUS
+ and ground PE be connected；
Second resistance R2 is arranged between the second end and the 3rd end, i.e., respectively with dc bus negative pole BUS- and ground PE phases
Even；
Two inputs of voltage detecting circuit 101 are connected with the second end and the 3rd end respectively, i.e., respectively with dc bus
Negative pole BUS- and ground PE is connected；
The output end of voltage detecting circuit 101 is connected with the input of processor 102, for exporting detection voltage for processing
Device 102 is calculated；
First output end of processor 102 first is opened by the 4th end and the control end of boost conversion circuit, namely in Fig. 3
The control end for closing pipe Q1 is connected；
Second output end of processor 102 is connected with switching K control end；
Processor 102 is used for controlling switch K on or off, and output control signal, to control boost conversion circuit work
Make, raise DC bus-bar voltage；After DC bus-bar voltage is increased to expect voltage, according to electricity under switch K turn-on and turn-off
The detection voltage that pressure detection circuit 101 is exported, calculates the insulation impedance for obtaining photovoltaic array in photovoltaic generating system.
The concrete operating principle of insulation detection device shown in Fig. 5 is：
First to electric on inverter, electricity on photovoltaic array positive pole PV+, before grid-connected inverters, control to rise by processor 102
Pressure translation circuit boosts to expectation voltage Vp, after electric capacity C1 both end voltages are stable, turned off by the controlling switch K of processor 102,
Detect that lower bridge arm voltage is V by voltage detecting circuit 101 againISO1.Then, turned on by the controlling switch K of processor 102, then
Lower bridge arm voltage is obtained for V by the detection of voltage detecting circuit 101ISO2。
Fig. 6 is the equivalent resistance circuit shown in Fig. 5, can be obtained according to Circuit Theorem：
Simultaneous formula (6), formula (7) can solve the total insulaion resistance R+ //R- of photovoltaic array both positive and negative polarity over the ground：
By formula (6), formula (7) can equally calculate voltage detecting circuit 101 output the voltage of detection twice be respectively：
From formula (9), formula (10), as DC bus-bar voltage VpDuring increase, voltage V is detectedISO1、VISO2Increase,
Same oversampling ratio enters processor 102, DC bus-bar voltage VpBigger sampling precision is higher, therefore solves prior art inspection
Survey the problem of error is big.
Or, referring to Fig. 7, the insulation detection device includes：Switch K, first resistor R1, second resistance R2, voltage inspection
Slowdown monitoring circuit 101 and processor 102；Wherein：
First resistor R1 is arranged between first end and the 3rd end, i.e., respectively with dc bus positive pole BUS+ and ground PE phases
Even；
Switch K and second resistance R2 be arranged in series between the second end and the 3rd end, i.e., respectively with dc bus negative pole
BUS- and ground PE is connected；
Two inputs of voltage detecting circuit 101 are connected with the second end and the 3rd end respectively, i.e., respectively with dc bus
Negative pole BUS- and ground PE is connected；
The output end of voltage detecting circuit 101 is connected with the input of processor 102, for exporting detection voltage for processing
Device 102 is calculated；
First output end of processor 102 first is opened by the 4th end and the control end of boost conversion circuit, namely in Fig. 3
The control end for closing pipe Q1 is connected；
Second output end of processor 102 is connected with switching K control end；
Processor 102 is used for controlling switch K on or off, and output control signal, to control boost conversion circuit work
Make, raise DC bus-bar voltage；After DC bus-bar voltage is increased to expect voltage, according to electricity under switch K turn-on and turn-off
The detection voltage that pressure detection circuit 101 is exported, calculates the insulation impedance for obtaining photovoltaic array in photovoltaic generating system.
Fig. 8 is the equivalent resistance circuit shown in Fig. 7, can be obtained according to Circuit Theorem：
Simultaneous formula (6), formula (7) can solve the total insulaion resistance R+ //R- of photovoltaic array both positive and negative polarity over the ground：
By formula (6), formula (7) can equally calculate voltage detecting circuit 101 output the voltage of detection twice be respectively：
From formula (14), formula (15), as DC bus-bar voltage VpDuring increase, voltage V is detectedISO1、VISO2Increase
Greatly, same oversampling ratio enters processor 102, DC bus-bar voltage VpBigger sampling precision is higher, therefore solves existing skill
The problem of art detection error is big.
It is preferred that, in Fig. 5 or structure shown in Fig. 6, if processor 102 is before control DC bus-bar voltage rise, detection
It is more than or equal to DC bus-bar voltage and expects voltage Vp, then illustrate that the precision now calculated can meet requirement, processor
102 can be without carrying out boosting rectifier control, directly according to the detection voltage V under switch K turn-on and turn-offISO1、VISO2Calculated,
Obtain the insulation impedance of photovoltaic array in photovoltaic generating system.
What deserves to be explained is, expect voltage VpThe maximum allowable input voltage of inverter can be equal to, or one low
In the maximum allowable input voltage of inverter and meet the value of computational accuracy, be not specifically limited herein, can regard itself particularly due to
Depending on environment, in the protection domain of the application.
It is preferred that, in the above-described embodiments, processor 102 can be the controller being integrated in inverter；Or, processing
Device 102 can also be DSP (Digital Signal Processing, data signal based on single-chip microcomputer or arm processor
Processor).
It is preferred that, voltage detecting circuit 101 is ADC (Analog-to-digital converter, Analog-digital Converter
Device).
Voltage detecting circuit 101 can not do specific limit herein with processor 102 depending on its concrete application environment
It is fixed, in the protection domain of the application.
Another embodiment of the present invention additionally provides a kind of inverter, including：In inverter circuit and any of the above-described embodiment
Insulation detection device.
Also, at least one boost conversion circuit can also be integrated with the inverter, to be sent out applied to distributed photovoltaic
Electric system, now, the connection diagram of its insulation detection device are as shown in Figure 9.
In different photovoltaic generating systems, the inverter can be any inverter suitable for current system, simply
Include any described insulation detection device of above-described embodiment inside it, its visual tool of its internal various other structure
Depending on body application environment, no longer repeat one by one herein, in the protection domain of the application.
Remaining operation principle is same as the previously described embodiments, no longer repeats one by one herein.
The embodiment of each in the present invention is described by the way of progressive, and what each embodiment was stressed is and other realities
Apply the difference of example, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
Speech, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is referring to method part illustration
.
The above described is only a preferred embodiment of the present invention, not making any formal limitation to the present invention.Though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and techniques content of the disclosure above to the present invention
Technical scheme makes many possible variations and modification, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every without departing from
The content of technical solution of the present invention, the technical spirit according to the present invention is to any simple modification made for any of the above embodiments, equivalent
Change and modify, still fall within technical solution of the present invention protection in the range of.
Claims (10)
1. a kind of insulation detection device, it is characterised in that be arranged at inverter circuit and at least one boosting of photovoltaic generating system
Between translation circuit；The port of the insulation detection device includes：First end, the second end, the 3rd end and the 4th end；Wherein：
The first end is connected with dc bus positive pole；
Second end is connected with dc bus negative pole；
The 3rd end ground connection；
4th end is connected with the control end of the boost conversion circuit；
The insulation detection device is used for the control end for outputing control signals to the boost conversion circuit, to control the boosting
Translation circuit works, and raises DC bus-bar voltage, and according to detection voltage after DC bus-bar voltage is increased to expectation voltage
Calculate the insulation impedance for obtaining photovoltaic array in photovoltaic generating system.
2. insulation detection device according to claim 1, it is characterised in that the insulation detection device includes：First electricity
Resistance, second resistance, voltage detecting circuit and processor；Wherein：
The first resistor is arranged between the first end and the 3rd end；
The second resistance is arranged between second end and the 3rd end；
Two inputs of the voltage detecting circuit are connected with second end and the 3rd end respectively；
The output end output of the voltage detecting circuit is described to be detected voltage, is connected with the input of the processor；
First output end of the processor is connected with the 4th end；
The processor is used to export the control signal, to control the boost conversion circuit to work, makes DC bus-bar voltage
Rise, and after DC bus-bar voltage is increased to the expectation voltage, according to the voltage detecting under different DC bus-bar voltages
The detection voltage of circuit output, calculates the insulation impedance for obtaining photovoltaic array in photovoltaic generating system.
3. insulation detection device according to claim 1, it is characterised in that the processor is additionally operable to：It is described in output
Before control signal, if the DC bus-bar voltage detected be equal to the maximum allowable input voltage of inverter, it is to be checked measure it is straight
Flow after busbar voltage decline, further according to the detection voltage of the voltage detecting circuit output under different DC bus-bar voltages,
Calculate the insulation impedance for obtaining photovoltaic array in photovoltaic generating system.
4. insulation detection device according to claim 1, it is characterised in that the insulation detection device includes：Switch, the
One resistance, second resistance, voltage detecting circuit and processor；Wherein：
The switch and the first resistor are arranged in series between the first end and the 3rd end；
The second resistance is arranged between second end and the 3rd end；
Two inputs of the voltage detecting circuit are connected with second end and the 3rd end respectively；
The output end output of the voltage detecting circuit is described to be detected voltage, is connected with the input of the processor；
First output end of the processor is connected with the 4th end；
Second output end of the processor is connected with the control end of the switch；
The processor is used to control the switch conduction or shut-off, and exports the control signal, to control the boosting to become
Circuit work is changed, DC bus-bar voltage is raised；After DC bus-bar voltage is increased to the expectation voltage, according to the switch
The detection voltage of the voltage detecting circuit output under turn-on and turn-off, calculating obtains photovoltaic array in photovoltaic generating system
Insulation impedance.
5. insulation detection device according to claim 1, it is characterised in that the insulation detection device includes：Switch, the
One resistance, second resistance, voltage detecting circuit and processor；Wherein：
The first resistor is arranged between the first end and the 3rd end；
The switch and the second resistance are arranged in series between second end and the 3rd end；
Two inputs of the voltage detecting circuit are connected with second end and the 3rd end respectively；
The output end output of the voltage detecting circuit is described to be detected voltage, is connected with the input of the processor；
First output end of the processor is connected with the 4th end；
Second output end of the processor is connected with the control end of the switch；
The processor is used to control the switch conduction or shut-off, and exports the control signal, to control the boosting to become
Circuit work is changed, DC bus-bar voltage is raised；After DC bus-bar voltage is increased to the expectation voltage, according to the switch
The detection voltage of the voltage detecting circuit output under turn-on and turn-off, calculating obtains photovoltaic array in photovoltaic generating system
Insulation impedance.
6. the insulation detection device according to claim 4 or 5, it is characterised in that the processor is additionally operable to：In output institute
State before control signal, if the DC bus-bar voltage detected is more than or equal to the expectation voltage, directly opened according to
The detection voltage of the voltage detecting circuit output under turn-on and turn-off is closed, calculating obtains photovoltaic battle array in photovoltaic generating system
The insulation impedance of row.
7. according to any described insulation detection device of claim 2 to 5, it is characterised in that the processor is integrated in inversion
Controller in device；Or, the processor is the digital signal processor DSP based on single-chip microcomputer or arm processor.
8. insulation detection device according to claim 7, it is characterised in that the voltage detecting circuit turns for simulation numeral
Parallel operation ADC.
9. a kind of inverter, it is characterised in that including：Inverter circuit and any described Insulation monitoring dress of claim 1 to 8
Put.
10. inverter according to claim 9, it is characterised in that also include：At least one boost conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710398983.2A CN106997008B (en) | 2017-05-31 | 2017-05-31 | Insulation detection device and inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710398983.2A CN106997008B (en) | 2017-05-31 | 2017-05-31 | Insulation detection device and inverter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106997008A true CN106997008A (en) | 2017-08-01 |
| CN106997008B CN106997008B (en) | 2020-11-10 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306335A (en) * | 2018-03-02 | 2018-07-20 | 阳光电源股份有限公司 | Photovoltaic generating system, inverter and its be incorporated into the power networks control method and device |
| CN110646672A (en) * | 2019-09-17 | 2020-01-03 | 珠海格力电器股份有限公司 | Converter power-on control circuit and method capable of being controlled in real time and converter equipment |
| CN111090027A (en) * | 2018-10-08 | 2020-05-01 | 大众汽车有限公司 | High voltage system and method for monitoring an insulation fault in a high voltage system |
| CN111566490A (en) * | 2019-07-23 | 2020-08-21 | 深圳欣锐科技股份有限公司 | Insulation detection circuit, mainboard and relevant device |
| 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 |
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| 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 |
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| CN112924753A (en) * | 2019-12-06 | 2021-06-08 | 苏州阿特斯阳光电力科技有限公司 | Detection apparatus for photovoltaic array is to ground insulation resistance |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120672A (en) * | 1994-04-30 | 1996-04-17 | 佳能株式会社 | Insulation state measurement method, insulation state judgement apparatus, and dispersion type power generating system using the same |
| CN102279318A (en) * | 2011-06-23 | 2011-12-14 | 广东易事特电源股份有限公司 | Online detection system of insulating resistance to ground of photovoltaic grid-connected inverter |
| CN102279317A (en) * | 2011-06-23 | 2011-12-14 | 广东易事特电源股份有限公司 | Online detection method of insulating resistance to ground of photovoltaic grid-connected inverter |
| CN102520254A (en) * | 2012-01-06 | 2012-06-27 | 西安龙腾新能源科技发展有限公司 | Detection method of insulation resistance of high-precision photovoltaic inverter |
| WO2012098677A1 (en) * | 2011-01-21 | 2012-07-26 | 三菱電機株式会社 | Insulation resistance detection circuit |
| CN102798760A (en) * | 2012-08-16 | 2012-11-28 | 阳光电源股份有限公司 | Method and circuit fir detecting ground insulation impedance of photovoltaic array |
| CN103048544A (en) * | 2012-12-13 | 2013-04-17 | 常熟开关制造有限公司(原常熟开关厂） | Insulation resistance monitoring method of photovoltaic power generation system |
| CN103091560A (en) * | 2012-12-24 | 2013-05-08 | 江苏兆伏新能源有限公司 | Double line photovoltaic input insulation resistance detection circuit and detection method |
| CN104378068A (en) * | 2014-11-21 | 2015-02-25 | 江苏兆伏爱索新能源有限公司 | Detection method and circuit for ground insulation resistance of photovoltaic module array |
| CN104535839A (en) * | 2014-12-24 | 2015-04-22 | 常熟开关制造有限公司(原常熟开关厂） | Photovoltaic grid-connected inverter insulation resistance detecting method and detecting device for implementing same |
| CN104977471A (en) * | 2014-04-11 | 2015-10-14 | 艾默生网络能源有限公司 | Double-channel input photovoltaic inverter grounding insulation impedance detection system, method and apparatus |
| CN106597103A (en) * | 2016-12-23 | 2017-04-26 | 阳光电源股份有限公司 | Insulation resistance detection method of photovoltaic inverter direct current side and controller |
-
2017
- 2017-05-31 CN CN201710398983.2A patent/CN106997008B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120672A (en) * | 1994-04-30 | 1996-04-17 | 佳能株式会社 | Insulation state measurement method, insulation state judgement apparatus, and dispersion type power generating system using the same |
| WO2012098677A1 (en) * | 2011-01-21 | 2012-07-26 | 三菱電機株式会社 | Insulation resistance detection circuit |
| CN102279318A (en) * | 2011-06-23 | 2011-12-14 | 广东易事特电源股份有限公司 | Online detection system of insulating resistance to ground of photovoltaic grid-connected inverter |
| CN102279317A (en) * | 2011-06-23 | 2011-12-14 | 广东易事特电源股份有限公司 | Online detection method of insulating resistance to ground of photovoltaic grid-connected inverter |
| CN102520254A (en) * | 2012-01-06 | 2012-06-27 | 西安龙腾新能源科技发展有限公司 | Detection method of insulation resistance of high-precision photovoltaic inverter |
| CN102798760A (en) * | 2012-08-16 | 2012-11-28 | 阳光电源股份有限公司 | Method and circuit fir detecting ground insulation impedance of photovoltaic array |
| CN103048544A (en) * | 2012-12-13 | 2013-04-17 | 常熟开关制造有限公司(原常熟开关厂） | Insulation resistance monitoring method of photovoltaic power generation system |
| CN103091560A (en) * | 2012-12-24 | 2013-05-08 | 江苏兆伏新能源有限公司 | Double line photovoltaic input insulation resistance detection circuit and detection method |
| CN104977471A (en) * | 2014-04-11 | 2015-10-14 | 艾默生网络能源有限公司 | Double-channel input photovoltaic inverter grounding insulation impedance detection system, method and apparatus |
| CN104378068A (en) * | 2014-11-21 | 2015-02-25 | 江苏兆伏爱索新能源有限公司 | Detection method and circuit for ground insulation resistance of photovoltaic module array |
| CN104535839A (en) * | 2014-12-24 | 2015-04-22 | 常熟开关制造有限公司(原常熟开关厂） | Photovoltaic grid-connected inverter insulation resistance detecting method and detecting device for implementing same |
| CN106597103A (en) * | 2016-12-23 | 2017-04-26 | 阳光电源股份有限公司 | Insulation resistance detection method of photovoltaic inverter direct current side and controller |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111082460B (en) * | 2018-03-02 | 2022-04-08 | 阳光电源股份有限公司 | Photovoltaic power generation system, inverter, grid-connected operation control method and device thereof |
| CN111082460A (en) * | 2018-03-02 | 2020-04-28 | 阳光电源股份有限公司 | Photovoltaic power generation system, inverter, grid-connected operation control method and device thereof |
| CN108306335A (en) * | 2018-03-02 | 2018-07-20 | 阳光电源股份有限公司 | Photovoltaic generating system, inverter and its be incorporated into the power networks control method and device |
| CN111090027B (en) * | 2018-10-08 | 2022-09-02 | 大众汽车有限公司 | High voltage system and method for monitoring an insulation fault in a high voltage system |
| CN111090027A (en) * | 2018-10-08 | 2020-05-01 | 大众汽车有限公司 | High voltage system and method for monitoring an insulation fault in a high voltage system |
| CN111566490A (en) * | 2019-07-23 | 2020-08-21 | 深圳欣锐科技股份有限公司 | Insulation detection circuit, mainboard and relevant device |
| US20210063464A1 (en) * | 2019-08-28 | 2021-03-04 | Delta Electronics (Shanghai) Co.,Ltd. | Insulation monitoring device applied to power system and power system |
| US11575312B2 (en) * | 2019-08-28 | 2023-02-07 | Delta Electronics (Shanghai) Co., Ltd. | Insulation monitoring device applied to power system and power system |
| CN110646672A (en) * | 2019-09-17 | 2020-01-03 | 珠海格力电器股份有限公司 | Converter power-on control circuit and method capable of being controlled in real time and converter equipment |
| CN112924752A (en) * | 2019-12-06 | 2021-06-08 | 台达电子企业管理（上海）有限公司 | Insulation impedance detection circuit and insulation impedance detection method of photovoltaic inverter system |
| CN112924753A (en) * | 2019-12-06 | 2021-06-08 | 苏州阿特斯阳光电力科技有限公司 | Detection apparatus for photovoltaic array is to ground insulation resistance |
| CN112924753B (en) * | 2019-12-06 | 2022-09-16 | 苏州阿特斯阳光电力科技有限公司 | Detection apparatus for photovoltaic array is to ground insulation resistance |
| US11474133B2 (en) | 2019-12-06 | 2022-10-18 | Delta Electronics (Shanghai) Co., Ltd | Insulation impedance detection circuit and insulation impedance detection method of photovoltaic inverter system |
| 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 |
| 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 |
| CN113804543A (en) * | 2021-09-14 | 2021-12-17 | 山东省医疗器械和药品包装检验研究院 | Artificial cochlea implant electrode lead stretchability evaluation method |
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