CN103323674B - The real-time detection circuit of the ground insulation resistance of photovoltaic combining inverter and detection method - Google Patents
The real-time detection circuit of the ground insulation resistance of photovoltaic combining inverter and detection method Download PDFInfo
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- CN103323674B CN103323674B CN201310191515.XA CN201310191515A CN103323674B CN 103323674 B CN103323674 B CN 103323674B CN 201310191515 A CN201310191515 A CN 201310191515A CN 103323674 B CN103323674 B CN 103323674B
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Abstract
The invention belongs to the testing circuit of photovoltaic combining inverter, be specifically designed a kind of real-time detection circuit for detecting photovoltaic combining inverter ground insulation resistance and detection method.The real-time detection circuit of the ground insulation resistance of photovoltaic combining inverter, positive pole including photovoltaic DC-to-AC converter, negative pole and earth point, connect between positive pole and the earth point of photovoltaic DC-to-AC converter and have positive pole insulation impedance, it is connected between the negative pole of photovoltaic DC-to-AC converter and earth point and has negative insulation impedance, it is provided with DSP between negative pole and earth point and detects controller, the first auxiliary resistance it is provided with between positive pole and earth point, the second auxiliary resistance it is provided with between negative pole and earth point, it is also associated with between positive pole and earth point controlling the first relay whether the first auxiliary resistance accesses, it is also associated with between negative pole and earth point controlling the second relay whether the second auxiliary resistance accesses.The present invention can detect photovoltaic combining inverter earth impedance in real time and accurately, and can judge the size of earth impedance accurately.
Description
Technical field
The invention belongs to the testing circuit of photovoltaic combining inverter, be specifically designed a kind of real-time detection circuit for detecting photovoltaic combining inverter ground insulation resistance and detection method.
Background technology
In photovoltaic generating system, in order to prevent solar panel from bringing Danger Electric shock risk due to decreasing insulating, it is desirable to photovoltaic combining inverter has the function of direct current ground insulation resistance detection.And inverter in the market is all only to detect before start once or accuracy of detection is low.
Under normal circumstances, the negative or positive electrode of photovoltaic DC-to-AC converter insulation impedance over the ground is all at more than 2M Ω, as it is shown in figure 1, equivalent resistance when R1 is test and between positive pole and ground.The newest standards of a lot of relevant authentication mechanisms requires that negative or positive electrode the upper resistance less than 30K Ω i.e. report disorderly closedown, and the resistance more than 37K Ω remains to properly functioning.Insulation impedance is just detected measure of precision by this highest requirement.General inverter is all to judge that inverter ground is the most normal by the detection positive pole (SP) (PE) over the ground of photovoltaic combining inverter or negative pole (SN) voltage VPE over the ground.But due to 2M Ω for 30K Ω very large, to such an extent as to and VPE during upper 30K Ω and and VPE during upper 37K Ω differ the least, add the existence due to sampling error, directly cannot be judged the exact extension of insulation impedance at all by VPE.
Summary of the invention
The present invention is directed to the deficiencies in the prior art; devise a kind of testing circuit that can detect photovoltaic combining inverter earth impedance in real time and accurately; detection that can be real-time; and the size of earth impedance can be judged accurately; it is effectively guaranteed the safety of operator; also can reduce the number of times of photovoltaic DC-to-AC converter report machine halt trouble, it is ensured that equipment properly functioning simultaneously.
The present invention is achieved through the following technical solutions:
The real-time detection circuit of the ground insulation resistance of photovoltaic combining inverter, positive pole including photovoltaic DC-to-AC converter, negative pole and earth point, connect between positive pole and the earth point of photovoltaic DC-to-AC converter and have positive pole insulation impedance, it is connected between the negative pole of photovoltaic DC-to-AC converter and earth point and has negative insulation impedance, it is characterized in that: be provided with DSP between described negative pole and earth point and detect controller, the first auxiliary resistance it is provided with between described positive pole and earth point, the second auxiliary resistance it is provided with between negative pole and earth point, it is also associated with between positive pole and earth point controlling the first relay whether the first auxiliary resistance accesses, it is also associated with between negative pole and earth point controlling the second relay whether the second auxiliary resistance accesses.
The detection method of photovoltaic combining inverter ground insulation resistance, it is characterised in that: comprise the following steps:
A) user arranges upper limit RH of ground insulation resistance according to actually used situation by DSP detection controller, arranges the lower limit RL of ground insulation resistance, and the voltage between positive and negative end is VDC, and positive pole insulation impedance is RZ, and negative insulation impedance is RF；First auxiliary resistance R1F, the second auxiliary resistance is R2F；
B) when there being small resistor R1 to access between positive pole and earth point, the resistance value of R1 being preset as 1.2RH, resistance in parallel with positive pole insulation impedance for R1 now isResistance R between positive pole and negative pole is negative insulation impedance and R12 sum, and the calculating voltage at now negative insulation impedance two ends isThe voltage VPE at DSP detection controller detection negative insulation impedance two ends, when VPE is more than VRFTime, then explanation has the resistance less than R1 to access between positive pole and earth point,
C) now, DPS detection controller controls the second cut-off, and the second auxiliary resistance accesses in circuit, and now the resistance value of fiducial value R2 is preset asResistance in parallel with positive pole insulation impedance for R2 isThe second auxiliary resistance resistance in parallel with negative insulation impedance isThe calculating voltage at negative insulation impedance two ends isThe voltage VPE at DSP detection controller detection negative insulation impedance two ends, when VPE is more than VRF' time, being then determined with the resistance less than R2 and access between positive pole and earth point, now DSP detection controller sends alarm signal, otherwise, VPE is less than VRF', then the resistance being determined with resistance between R2 to 1.2RH accesses between positive pole and earth point；
Above-mentioned determination methods also can be used for the detection of the ground insulation resistance between negative pole and earth point.
In sum, the present invention is directed to the problem that in prior art, the precision of the detection of photovoltaic DC-to-AC converter ground insulation resistance is inadequate and real-time is poor, the present invention devises a kind of testing circuit that can detect photovoltaic DC-to-AC converter ground insulation resistance in real time and accurately, give the detection method judging whether ground insulation resistance reports fault simultaneously, present invention achieves photovoltaic DC-to-AC converter ground insulation resistance to detect in real time, people can be easy to and understand the situation of photovoltaic DC-to-AC converter ground insulation resistance in time, detection method the most of the present invention can accurately judge the scope of both positive and negative polarity and the resistance place of the ground insulation resistance of earth point, the low cost of testing circuit of the present invention, it is convenient for marketing.
Accompanying drawing explanation
Fig. 1 is the composition diagram of the testing circuit of the present invention；
In figure, 1 is the second auxiliary resistance, and 2 is the second relay, and 3 is the first auxiliary resistance, and 4 is the first relay, and 5 is positive pole, and 6 is positive pole insulation impedance, and 7 is earth point, and 8 detect controller for DSP, and 9 is negative pole, and 10 is negative insulation impedance.
Detailed description of the invention
The present invention will be further described below in conjunction with the accompanying drawings.
The real-time detection circuit of the ground insulation resistance of photovoltaic combining inverter, positive pole 5 including photovoltaic DC-to-AC converter, negative pole 9 and earth point 7, connect between positive pole and the earth point of photovoltaic DC-to-AC converter and have positive pole insulation impedance 6, it is connected between the negative pole of photovoltaic DC-to-AC converter and earth point and has negative insulation impedance 10, it is characterized in that: be provided with DSP between described negative pole and earth point and detect controller 8, the first auxiliary resistance 3 it is provided with between described positive pole 5 and earth point 7, the second auxiliary resistance 1 it is provided with between negative pole 9 and earth point 7, it is also associated with between positive pole and earth point controlling the first relay 4 whether the first auxiliary resistance 3 accesses, it is also associated with between negative pole and earth point controlling the second relay 2 whether the second auxiliary resistance 1 accesses.
The detection method of photovoltaic combining inverter ground insulation resistance, it is characterised in that: comprise the following steps:
A) user arranges upper limit RH of ground insulation resistance according to actually used situation by DSP detection controller, arranges the lower limit RL of ground insulation resistance, and the voltage between positive and negative end is VDC, and positive pole insulation impedance is RZ, and negative insulation impedance is RF；First auxiliary resistance R1F, the second auxiliary resistance is R2F；
B) when there being small resistor R1 to access between positive pole and earth point, the resistance value of R1 being preset as 1.2RH, resistance in parallel with positive pole insulation impedance for R1 now isResistance R between positive pole and negative pole is negative insulation impedance and R12 sum, and the calculating voltage at now negative insulation impedance two ends isThe voltage VPE at DSP detection controller detection negative insulation impedance two ends, when VPE is more than VRFTime, then explanation has the resistance less than R1 to access between positive pole and earth point,
C) now, DPS detection controller controls the second cut-off, and the second auxiliary resistance accesses in circuit, and now the resistance value of fiducial value R2 is preset asResistance in parallel with positive pole insulation impedance for R2 isThe second auxiliary resistance resistance in parallel with negative insulation impedance isThe calculating voltage at negative insulation impedance two ends isThe voltage VPE at DSP detection controller detection negative insulation impedance two ends, when VPE is more than VRF' time, being then determined with the resistance less than R2 and access between positive pole and earth point, now DSP detection controller sends alarm signal, otherwise, VPE is less than VRF', then the resistance being determined with resistance between R2 to 1.2RH accesses between positive pole and earth point；
Above-mentioned determination methods also can be used for the detection of the ground insulation resistance between negative pole and earth point.
In sum, the present invention is directed to the problem that in prior art, the precision of the detection of photovoltaic DC-to-AC converter ground insulation resistance is inadequate and real-time is poor, the present invention devises a kind of testing circuit that can detect photovoltaic DC-to-AC converter ground insulation resistance in real time and accurately, give the detection method judging whether ground insulation resistance reports fault simultaneously, present invention achieves photovoltaic DC-to-AC converter ground insulation resistance to detect in real time, people can be easy to and understand the situation of photovoltaic DC-to-AC converter ground insulation resistance in time, detection method the most of the present invention can accurately judge the scope of both positive and negative polarity and the resistance place of the ground insulation resistance of earth point, the low cost of testing circuit of the present invention, it is convenient for marketing.
Claims (1)
1. the detection method of photovoltaic combining inverter ground insulation resistance, positive pole including photovoltaic DC-to-AC converter, negative pole and earth point, connect between positive pole and the earth point of photovoltaic DC-to-AC converter and have positive pole insulation impedance, it is connected between the negative pole of photovoltaic DC-to-AC converter and earth point and has negative insulation impedance, it is characterized in that: be provided with DSP between described negative pole and earth point and detect controller, the first auxiliary resistance it is provided with between described positive pole and earth point, the second auxiliary resistance it is provided with between negative pole and earth point, it is also associated with between positive pole and earth point controlling the first relay whether the first auxiliary resistance accesses, it is also associated with between negative pole and earth point controlling the second relay whether the second auxiliary resistance accesses；It is characterized in that: comprise the following steps:
A) user arranges upper limit RH of ground insulation resistance according to actually used situation by DSP detection controller, arranges the lower limit RL of ground insulation resistance, and the voltage between positive and negative end is VDC, and positive pole insulation impedance is RZ, and negative insulation impedance is RF；First auxiliary resistance R1F, the second auxiliary resistance is R2F；
B) when there being small resistor R1 to access between positive pole and earth point, the resistance value of R1 being preset as 1.2RH, resistance in parallel with positive pole insulation impedance for R1 now isResistance R between positive pole and negative pole is negative insulation impedance and R12 sum, and the calculating voltage at now negative insulation impedance two ends isThe voltage VPE at DSP detection controller detection negative insulation impedance two ends, when VPE is more than VRFTime, then explanation has the resistance less than R1 to access between positive pole and earth point,
C) now, DPS detection controller controls the second cut-off, and the second auxiliary resistance accesses in circuit, and now the resistance value of fiducial value R2 is preset asResistance in parallel with positive pole insulation impedance for R2 isThe second auxiliary resistance resistance in parallel with negative insulation impedance isThe calculating voltage at negative insulation impedance two ends isThe voltage VPE at DSP detection controller detection negative insulation impedance two ends, when VPE is more than VRF' time, being then determined with the resistance less than R2 and access between positive pole and earth point, now DSP detection controller sends alarm signal, otherwise, VPE is less than VRF', then the resistance being determined with resistance between R2 to 1.2RH accesses between positive pole and earth point；
Said method also can be used for the detection of the ground insulation resistance between negative pole and earth point.
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| CN201310191515.XA CN103323674B (en) | 2013-05-21 | 2013-05-21 | The real-time detection circuit of the ground insulation resistance of photovoltaic combining inverter and detection method |
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| 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 |
| TWI547052B (en) | 2015-12-08 | 2016-08-21 | 台達電子工業股份有限公司 | Power distribution unit and fault detecting method |
| CN106855589B (en) * | 2015-12-08 | 2020-07-31 | 台达电子工业股份有限公司 | Power distributor and fault detection method thereof |
| CN107632201B (en) * | 2017-03-10 | 2021-02-19 | 浙江艾罗网络能源技术股份有限公司 | Method for detecting impedance from multi-path direct current power supply to ground |
| CN107015061A (en) * | 2017-03-10 | 2017-08-04 | 浙江艾罗电源有限公司 | The detection method of multi-channel DC input power both positive and negative polarity ground insulation resistance |
| CN107968627A (en) * | 2017-11-14 | 2018-04-27 | 珠海格力电器股份有限公司 | Detection device and method and non-isolated photovoltaic system comprising detection device |
| CN108279331B (en) * | 2018-03-21 | 2023-11-10 | 爱士惟科技股份有限公司 | Photovoltaic inverter insulation resistance detection circuit and method |
| 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 |
| CN115656637B (en) * | 2022-10-24 | 2024-03-26 | 中南大学 | Low-cost photovoltaic panel ground insulation resistance detection circuit and detection method |
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| JPH0298673A (en) * | 1988-10-05 | 1990-04-11 | Toshiba Corp | Insulation resistance detector |
| JP3716308B2 (en) * | 2002-10-30 | 2005-11-16 | 独立行政法人産業技術総合研究所 | High resistance measuring method and high resistance measuring apparatus |
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|---|---|---|---|---|
| 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 |
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| CN203249968U (en) * | 2013-05-21 | 2013-10-23 | 江苏宝丰新能源科技有限公司 | A real-time detecting circuit for detecting the earth insulation impedance of a photovoltaic grid-connected inverter |
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