CN103091560A - Double line photovoltaic input insulation resistance detection circuit and detection method - Google Patents
Double line photovoltaic input insulation resistance detection circuit and detection method Download PDFInfo
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- CN103091560A CN103091560A CN2012105649847A CN201210564984A CN103091560A CN 103091560 A CN103091560 A CN 103091560A CN 2012105649847 A CN2012105649847 A CN 2012105649847A CN 201210564984 A CN201210564984 A CN 201210564984A CN 103091560 A CN103091560 A CN 103091560A
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Abstract
The invention discloses a double line photovoltaic input insulation resistance detection circuit which comprises a first positive electrode and a second electrode which are arranged to be in parallel with a negative electrode, a first switch component arranged on the first positive electrode, a second switch component arranged on the second positive electrode, a third switch component, a first resistance, a second resistance, and a third resistance which are arranged between the first positive electrode and the negative electrode sequentially, a voltage detection device connected between the second resistance and the third resistance and used for detecting voltage value of the third resistance, and a control device for controlling on-off of the first switch component, the second switch component and the third switch component, wherein the first positive electrode and the negative electrode are formed into a first PV input, the second positive electrode and the negative electrode are formed into a second PV input, the first resistance and the second resistance are in ground connection.
Description
Technical field
Relate to a kind of insulation impedance testing circuit of two-way photovoltaic input in the present invention, the invention still further relates to the insulation impedance detection method that a kind of two-way photovoltaic is inputted.
Background technology
Along with the universal use of photovoltaic generation power supply, people's concern is more and more received in the security of photovoltaic battery panel.In the parallel network power generation technology, a quality that key index is exactly the insulation degree of photovoltaic combining inverter safety, whether the state of insulation that the insulation impedance measuring technique can be judged current system is good, and the situation of change of state of insulation.Need photovoltaic combining inverter every day to carry out the detection of the insulation against ground resistance of photovoltaic cell before start, require the insulation against ground resistance of combining inverter to be not less than 1K Ω/V in the TUV authentication.
The insulation impedance of most photovoltaic DC-to-AC converter two-way photovoltaic input detects the coupling due to two-way insulation against ground impedance, and rarer more accurate method can detect insulation impedance.General is all the determination methods that adopts hypothesis, and the insulation impedance of detection is also a scope, under some conditions, even has blind spot, can only get the protection that direction is done the insulation impedance by impedance variation, and there is potential safety hazard during to the work of inverter in this.
Therefore in grid-connected application, the operating position of the input of two-way PV panel is more and more general, is also in the urgent need to address about the method for the high-precision detection of two-way PV insulation impedance.
Summary of the invention
The invention provides a kind of insulation impedance testing circuit and detection method of two-way photovoltaic input, it can detect the insulation impedance value of two-way photovoltaic input accurately.
The invention discloses a kind of insulation impedance testing circuit of two-way photovoltaic input, it comprises first anodal and the second positive pole that is in parallel and arranges with negative pole, the described first anodal and described negative pole formation first via PV input, described second anodal and described negative pole formation the second road PV input, it is characterized in that: the insulation impedance testing circuit of described two-way photovoltaic input comprises
One is arranged on the first switching device on the first positive pole;
One is arranged on the second switch device on the second positive pole;
Be arranged in parallel successively the 3rd switching device, the first resistance, the second resistance, the 3rd resistance between the first positive pole and negative pole, ground connection between described the first resistance and described the second resistance, wherein the 3rd switching device is connected with the first positive pole, and the 3rd resistance is connected with negative pole;
One voltage check device, it is connected between described the second resistance and described the 3rd resistance, in order to detect the magnitude of voltage of described the 3rd resistance;
One control device, it is used for controlling the shutoff of described the first switching device, described second switch device, described the 3rd switching device.
Preferably, it also comprises the first switch DC booster circuit that is arranged on described the first positive pole.
Preferably, it also comprises the second switch DC voltage booster circuit that is arranged on described the second positive pole.
Preferably, described control device is the DSP manager.
The invention also discloses a kind of insulation impedance detection method of application circuit, it comprises the following steps:
A) open described the first switching device, disconnect described second switch device and described the 3rd switching device, detect and obtain the first magnitude of voltage;
B) open described the first switching device, disconnect described second switch device, open described the 3rd switching device, detect and obtain the second voltage value;
C) calculate the first insulation impedance value of the first positive pole and the 3rd insulation impedance value of negative pole according to the first magnitude of voltage and second voltage value;
D) open described second switch device, disconnect described the first switching device, detect and obtain the tertiary voltage value;
E) according to tertiary voltage value and the 3rd insulation impedance value, calculate the second insulation impedance value of the second positive pole.
Preferably, when opening described the first switching device, disconnect described second switch device and described the 3rd switching device, after detection obtains the first magnitude of voltage, obtain.
Preferably, when opening described the first switching device, disconnect described second switch device, open described the 3rd switching device, detect and obtain the second voltage value, obtain.
Preferably, when opening described the first switching device, disconnect described second switch device, open described the 3rd switching device, detect and obtain the tertiary voltage value, obtain.
The present invention adopts above structure and method, can calculate accurately the insulation impedance of two-way photovoltaic input.
Description of drawings
Accompanying drawing 1 is structural principle schematic diagram of the present invention.
Accompanying drawing 2 is opened the first switching device for the present invention works as, the equivalent-circuit model figure when disconnecting the second switch device.
Accompanying drawing 3 is opened the second switch device for the present invention works as, the equivalent-circuit model figure when disconnecting the first switching device.
In accompanying drawing: R2, the first resistance; R3, the second resistance; R4, the 3rd resistance; X1, the first insulation impedance; X2, the second insulation impedance; X3, the 3rd insulation impedance; PV_1+, the first positive pole; PV_2+, the second positive pole; PV-, negative pole; DSP, DSP manager; S1, the first switching device; S2, second switch device; S3, the 3rd switching device; BOOST_1, the first switch DC booster circuit; BOOST_2, second switch DC voltage booster circuit.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention is made more explicit defining.
A kind of two-way photovoltaic input circuit, it comprises the first anodal PV_1+ and the second anodal PV_2+ that is in parallel and arranges with negative pole, the described first anodal PV_1+ and described negative pole PV-consist of first via PV input, and the described second anodal PV_2+ and described negative pole PV-consist of the second road PV input.
Certainly exist the first insulation impedance X1 on the first anodal PV_1+; Certainly exist the second insulation impedance X2 on the second anodal PV_2+; Certainly exist the 3rd insulation impedance X3 on negative pole.
Therefore in order to detect this three insulation impedances value, it comprises that one is arranged on the first switching device S1 on the first anodal PV_1+ this testing circuit; One is arranged on the second switch device S2 on the second anodal PV_2+; Be arranged in parallel successively the 3rd switching device S3, the first resistance R 2, the second resistance R 3, the 3rd resistance R 4 between the first anodal PV_1+ and negative pole PV-, centre-point earth between described the first resistance R 2 and described the second resistance R 3, the first resistance R 2 is mutually direct-connected with the first anodal PV_1+, and the 3rd resistance R 4 is mutually direct-connected with negative pole PV-; One voltage check device, it is connected in the central point between described the second resistance R 3 and described the 3rd resistance R 4, in order to detect the magnitude of voltage of described the 3rd resistance R 4; One control device DSP, it is used for controlling the shutoff of described the first switching device S1, described second switch device S2, described the 3rd switching device S3.
Concrete, the first switching device S1, second switch device S2 and the 3rd switching device S3 can be the various elements that can open or turn-off circuit of living in such as relay, switching tube.
When arranging, can successively the 3rd switching device S3, the first resistance R 2, the second resistance R 3 be arranged in parallel between the first anodal PV_1+ and negative pole PV-.Then with the centre-point earth of the first resistance R 2 and the second resistance R 3, voltage check device is arranged between the second resistance R 2 and the 3rd resistance R 3.
The first anodal PV_1+ and the 3rd switching device S3 can also be contacted mutually, the 3rd switching device S3 and the first resistance R 2 ground connection that is in series, the 3rd resistance R 4 is contacted mutually with negative pole PV-, with the second resistance R 3 and the 3rd resistance R 4 ground connection that is in series, and voltage check device is arranged between the second resistance R 3 and the 3rd resistance R 4.
Above-mentioned two kinds of connected modes from principle say the equivalence.
Control device is used for controlling the shutoff of described the first switching device S1, described second switch device S2, described the 3rd switching device S3.Voltage check device, it is connected between described the second resistance R 3 and described the 3rd resistance R 4, in order to detect the magnitude of voltage of described the 3rd resistance R 4.Preferably, control device can be the DSP manager, and it can calculate the data that obtain from voltage check device.
Preferably, be provided with the first switch DC booster circuit BOOST_1 on the first positive pole, be provided with second switch DC voltage booster circuit BOOST_2 on the second positive pole.BOOST can stabilize and increase the voltage of input more.
A kind of detection method of using the insulation impedance testing circuit of two-way photovoltaic input, it comprises the following steps:
A) open described the first switching device S1, disconnect described second switch device S2 and described the 3rd switching device S3, detect and obtain the first magnitude of voltage Viso1, obtain formula one;
B) open described the first switching device S1, disconnect described second switch device S2, open described the 3rd switching device S3, detect and obtain second voltage value Viso2, obtain formula two;
C) calculate the first insulation impedance value X1 of the first anodal PV_1+ and the 3rd insulation impedance value X3 of negative pole PV-according to the first magnitude of voltage Viso1 and second voltage value Viso2, namely by finding the solution formula (), the linear equation in two unknowns that formula (two) forms, can obtain X1, the resistance of X3;
D) open described second switch device S2, disconnect described the first switching device S1, detect and obtain tertiary voltage value Viso3, obtain
, formula three;
E) according to tertiary voltage value Viso3 and the 3rd insulation impedance value X3, calculate the second insulation impedance value X2 of the second anodal PV_2+, because the 3rd insulation impedance value X3 is known, can obtain linear equation with one unknown, can obtain the resistance of the second insulation impedance value X2.
So just obtained PV anodal, the high precision of negative pole insulation impedance over the ground detects, measuring the value of coming and the safety restriction that is stored in DSP compares, if satisfy standard, inverter can carry out follow-up action, as not satisfying standard, disables inverter work, and the trigger alarm circuit sends warning.
Meanwhile, the first switching device S1, the switch controlling signal of second switch device S2 can trigger by the electronic switch of outside.When the circuit that disconnects the input of PV direct current and PV inside when needs interrelates, can disconnect the first switching device S1 by triggering the external electrical switch, second switch device S2 is to realize the function of DC-SWITCH.
Above specific embodiment of the present invention is illustrated in conjunction with diagram, clearly on the basis of not leaving scope and spirit of the present invention, can much revise prior art and technique.In technical field, the common knowledge of a GPRS just can in technology main idea scope of the present invention, be carried out diversified change under of the present invention.
Claims (8)
1. the insulation impedance testing circuit of two-way photovoltaic input, it comprises first anodal and the second positive pole that is in parallel and arranges with negative pole, the described first anodal and described negative pole formation first via PV input, described second anodal and described negative pole formation the second road PV input, it is characterized in that: the insulation impedance testing circuit of described two-way photovoltaic input comprises
One is arranged on the first switching device on the first positive pole;
One is arranged on the second switch device on the second positive pole;
Be arranged in parallel successively the 3rd switching device, the first resistance, the second resistance, the 3rd resistance between the first positive pole and negative pole, ground connection between described the first resistance and described the second resistance, wherein the 3rd switching device is connected with the first positive pole, and the 3rd resistance is connected with negative pole;
One voltage check device, it is connected between described the second resistance and described the 3rd resistance, in order to detect the magnitude of voltage of described the 3rd resistance;
One control device, it is used for controlling the shutoff of described the first switching device, described second switch device, described the 3rd switching device.
2. the insulation impedance testing circuit of two-way photovoltaic according to claim 1 input, it is characterized in that: it also comprises the first switch DC booster circuit that is arranged on described the first positive pole.
3. the insulation impedance testing circuit of two-way photovoltaic according to claim 1 input, it is characterized in that: it also comprises the second switch DC voltage booster circuit that is arranged on described the second positive pole.
4. the insulation impedance testing circuit of two-way photovoltaic according to claim 1 input, it is characterized in that: described control device is the DSP manager.
5. an application as the insulation impedance detection method of circuit as described in one of claim 1 to 4, is characterized in that, it comprises the following steps:
Open described the first switching device, disconnect described second switch device and described the 3rd switching device, detect and obtain the first magnitude of voltage;
Open described the first switching device, disconnect described second switch device, open described the 3rd switching device, detect and obtain the second voltage value;
Calculate the first insulation impedance value of the first positive pole and the 3rd insulation impedance value of negative pole according to the first magnitude of voltage and second voltage value;
Open described second switch device, disconnect described the first switching device, detect and obtain the tertiary voltage value;
According to tertiary voltage value and the 3rd insulation impedance value, calculate the second insulation impedance value of the second positive pole.
6. insulation impedance detection method according to claim 5, is characterized in that: when opening described the first switching device, disconnect described second switch device and described the 3rd switching device, after detection obtains the first magnitude of voltage, obtain
, wherein Vpv1 is first via PV input voltage, and X3 is the 3rd insulation impedance value, and R3 is the second resistance, and R4 is the 3rd resistance, Viso1 is the first magnitude of voltage.
7. insulation impedance detection method according to claim 5, is characterized in that: when opening described the first switching device, disconnect described second switch device, open described the 3rd switching device, detect and obtain the second voltage value, obtain
, wherein Vpv1 is first via PV input voltage, and X3 is the 3rd insulation impedance value, and R2 is the first resistance value, and R3 is the second resistance, and R4 is the 3rd resistance, and Viso2 is the second voltage value.
8. insulation impedance detection method according to claim 5, is characterized in that: when opening described the first switching device, disconnect described second switch device, open described the 3rd switching device, detect and obtain the tertiary voltage value, obtain
, wherein Vpv2 is first via PV input voltage, and X3 is the 3rd insulation impedance value, and R3 is the second resistance, and R4 is the 3rd resistance, Viso2 is the second voltage value.
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Cited By (9)
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| 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 |
| CN106707032A (en) * | 2017-01-19 | 2017-05-24 | 厦门昰能机电科技有限公司 | Ground wire resistance value detection circuit |
| CN106997008A (en) * | 2017-05-31 | 2017-08-01 | 阳光电源股份有限公司 | A kind of insulation detection device and inverter |
| CN109725202A (en) * | 2018-12-27 | 2019-05-07 | 科华恒盛股份有限公司 | Multichannel MPPT insulation resistance detection device and method |
| CN109830985A (en) * | 2019-03-25 | 2019-05-31 | 阳光电源股份有限公司 | A kind of multi-machine parallel connection system and its electric network impedance detection method |
| US10505437B2 (en) | 2016-07-07 | 2019-12-10 | Delta Electronics, Inc. | Power converting device and ground impedance value detecting method |
| CN112557754A (en) * | 2020-11-20 | 2021-03-26 | 珠海格力电器股份有限公司 | Insulation impedance detection method and device of photovoltaic inverter |
| CN115210585A (en) * | 2020-03-11 | 2022-10-18 | 弗罗纽斯国际有限公司 | Method for determining insulation resistance of photovoltaic system to ground and photovoltaic inverter |
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| 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 |
| CN104977471B (en) * | 2014-04-11 | 2018-02-16 | 维谛技术有限公司 | Dual input photovoltaic DC-to-AC converter ground insulation resistance detecting system, method and device |
| CN104535839B (en) * | 2014-12-24 | 2017-05-17 | 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 |
| 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 |
| US10505437B2 (en) | 2016-07-07 | 2019-12-10 | Delta Electronics, Inc. | Power converting device and ground impedance value detecting method |
| CN106707032A (en) * | 2017-01-19 | 2017-05-24 | 厦门昰能机电科技有限公司 | Ground wire resistance value detection circuit |
| CN106997008A (en) * | 2017-05-31 | 2017-08-01 | 阳光电源股份有限公司 | A kind of insulation detection device and inverter |
| CN109725202A (en) * | 2018-12-27 | 2019-05-07 | 科华恒盛股份有限公司 | Multichannel MPPT insulation resistance detection device and method |
| CN109830985A (en) * | 2019-03-25 | 2019-05-31 | 阳光电源股份有限公司 | A kind of multi-machine parallel connection system and its electric network impedance detection method |
| CN115210585A (en) * | 2020-03-11 | 2022-10-18 | 弗罗纽斯国际有限公司 | Method for determining insulation resistance of photovoltaic system to ground and photovoltaic inverter |
| CN112557754A (en) * | 2020-11-20 | 2021-03-26 | 珠海格力电器股份有限公司 | Insulation impedance detection method and device of photovoltaic inverter |
| WO2022105380A1 (en) * | 2020-11-20 | 2022-05-27 | 珠海格力电器股份有限公司 | Method and apparatus for detecting insulation impedance of photovoltaic inverter |
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Application publication date: 20130508 |