CN204044246U - A kind of square formation insulation impedance detection system of photovoltaic generating system - Google Patents
A kind of square formation insulation impedance detection system of photovoltaic generating system Download PDFInfo
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- CN204044246U CN204044246U CN201320787627.7U CN201320787627U CN204044246U CN 204044246 U CN204044246 U CN 204044246U CN 201320787627 U CN201320787627 U CN 201320787627U CN 204044246 U CN204044246 U CN 204044246U
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Abstract
The utility model discloses a kind of square formation insulation impedance detection system of photovoltaic generating system, comprise positive terminal sample circuit, negative pole end sample circuit, microprocessor and sampled signal is calculated photovoltaic arrays positive pole ground insulation resistance and negative pole ground insulation resistance value and compared with the setting value by insulating resistance value input circuit input microprocessor judge and report to the police to export.Can record and calculate the D.C. isolation impedance between electricity generation system input end and ground that photovoltaic arrays connects, when insulation impedance does not meet limit value requirement, indication fault externally controller reporting fault.Effectively can ensure that the insulating property of photovoltaic generating system cell panel square formation detect, be one simply, reliably, detection system fast, for the safe operation of photovoltaic generating system provides powerful guarantee.
Description
Technical field
The present utility model belongs to field of conversion of electrical energy, is specifically related to a kind of square formation insulation impedance detection system being applicable to photovoltaic generating system.
Background technology
In numerous new forms of energy, sun power becomes the focus that people pay attention to its exclusive advantage.Abundant solar radiant energy is important energy source that is inexhaustible, nexhaustible, pollution-free, that can freely utilize, and distribution of solar energy is extensive, is easy to as people utilize; It is one of the mankind's the most direct available clean energy resource.
Along with the capacity of photovoltaic generating system and the growth of quantity, the various functions of photovoltaic DC-to-AC converter is constantly perfect, comprising the detection to square formation insulation impedance.The insulating property affecting square formation mainly comprise two aspects: one be connect cable between cell panel due to the careless damage cable insulation in processing, process of deployment or insulation course aging; Two is that the insulation course of cell panel itself is aging.Once square formation insulation impedance value is lower than normal value, then directly can have influence on the security of operation of whole electricity generation system.
Beijing Jian Heng authentication center authentication techniques specification explicitly points out about in " grid-connected photovoltaic power generation special inverter technical conditions ", and the inverter be connected with earth-free photovoltaic arrays should start D.C. isolation impedance between pre-test assembly square formation input end and ground in system.When insulation impedance does not meet limit value requirement, indication fault is answered to the inverter of band isolation, but still can carry out other action and operation between age at failure; Though to non-isolated inverter or inverter have isolation its leakage current is undesirable, answer indication fault, and limit its access electrical network.
Summary of the invention
The technical problems to be solved in the utility model be to provide one simply, reliably, fast square formation insulation impedance detection system be applied in photovoltaic generating system; Measurement accuracy photovoltaic arrays insulation impedance over the ground before photovoltaic inverter grid-connected generating starts, protection system safe operation.
In order to solve the problems of the technologies described above the square formation insulation impedance detection system that the technical solution of the utility model is a kind of photovoltaic generating system, comprise: positive terminal sample circuit, one end is connected to photovoltaic generating system positive terminal, other end ground connection, carries out sampling to photovoltaic generating system positive pole and obtains the first sampled signal and input microprocessor; Negative pole end sample circuit, one end is connected to photovoltaic generating system negative pole end, other end ground connection, carries out sampling obtain the second sampled signal and input microprocessor to photovoltaic generating system negative pole; The output terminal of insulating resistance value input circuit connects microprocessor; Alarm output circuit and alarm lamp circuit are connected to the output terminal of microprocessor.
Preferably, positive terminal sample circuit comprises the first sampling resistor of one end ground connection, the other end of the first sampling resistor connects two-way and exports, one tunnel exports and connects the first relay and the first current-limiting resistance in turn, first current-limiting resistance is connected to the positive pole of photovoltaic arrays, and the coil of the first relay is connected to microprocessor by its current switching of Microprocessor S3C44B0X; Another road of first sampling resistor exports and is connected with amplifying circuit, the first voltage follower circuit and the first filtering circuit in the same way in turn, and the output terminal of the first filtering circuit connects microprocessor A/D and changes input port.
Preferably, amplifying circuit is built by operational amplifier LM348 and resistance and is formed in the same way, and operational amplifier LM348 in the same way input end connects the first sampling resistor, and reverse input end passes through resistance eutral grounding; First voltage follower circuit is made up of operational amplifier OP484ES; First filtering circuit is the filtering circuit that resistance and electric capacity build; First relay comprises relay body and is connected to the coil control circuit of I/O interface of relay body and microprocessor.
Preferably, negative pole end sample circuit comprises the second sampling resistor of one end ground connection, the other end of the second sampling resistor connects two-way and exports, one tunnel exports and connects the second relay and the second current-limiting resistance in turn, second current-limiting resistance is connected to the negative pole of photovoltaic arrays, and the coil of the second relay is connected to microprocessor by its current switching of Microprocessor S3C44B0X; Another road of second sampling resistor exports and is connected with reverse amplification circuit, the second voltage follower circuit and the second filtering circuit in turn, and the output terminal of the second filtering circuit connects microprocessor A/D and changes input port.
Preferably, reverse amplification circuit is built by operational amplifier LM348 and resistance and is formed, and operational amplifier LM348 reverse input end connects the first sampling resistor, and reverse input end passes through resistance eutral grounding; Second voltage follower circuit is made up of operational amplifier OP484ES; Second filtering circuit is the filtering circuit that resistance and electric capacity build; Second relay comprises relay body and is connected to the coil control circuit of I/O interface of relay body and microprocessor.
Preferably, insulating resistance value input circuit comprises the circuit that two 8421 scramblers are formed.
Preferably, alarm output circuit comprises two transistor output photoelectric coupling mechanism TLP281-4.
Preferably, microprocessor is also connected with alarm lamp circuit, and alarm lamp circuit is built by two light emitting diodes and resistance and formed.
The beneficial effects of the utility model are: can record and calculate the D.C. isolation impedance between electricity generation system input end and ground that photovoltaic arrays connects, when insulation impedance does not meet limit value requirement, and indication fault externally controller reporting fault.Effectively can ensure that the insulating property of photovoltaic generating system cell panel square formation detect, be one simply, reliably, detection system fast, for the safe operation of photovoltaic generating system provides powerful guarantee.
Accompanying drawing explanation
Fig. 1 is the system schematic of the utility model embodiment;
Fig. 2 is the positive terminal sample circuit of the utility model embodiment;
Fig. 3 is the negative pole end sample circuit of the utility model embodiment;
Fig. 4 is the insulation impedance fiducial value input circuit of the utility model embodiment;
Fig. 5 is the alarm lamp circuit of the utility model embodiment;
Fig. 6 is the alarm output circuit of the utility model embodiment;
Fig. 7 is the utility model embodiment microprocessor internal software flowing chart.
In figure:
1, the first impedance 2, second to be measured impedance 3, first sampling resistor 4, first current-limiting resistance 5 to be measured, in the same way amplifying circuit 6, first voltage follower circuit 7, first filtering circuit 8, first relay 9, second sampling resistor 10, second current-limiting resistance 11, reverse amplification circuit 12, second voltage follower circuit 13, second filtering circuit 14, second relay 15, microprocessor 16, insulating resistance value input circuit 17, alarm output circuit 18, alarm lamp circuit
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
As shown in Figures 1 to 6, the first impedance 1 to be measured is connected with between photovoltaic arrays positive terminal and the earth; The second impedance 2 to be measured is connected with between photovoltaic arrays negative pole end and the earth, the square formation insulation impedance detection system of a kind of photovoltaic generating system of the present embodiment, comprise: positive terminal sample circuit, one end is connected to photovoltaic generating system positive terminal, other end ground connection, carries out sampling to photovoltaic generating system positive pole and obtains the first sampled signal and input microprocessor 15; Negative pole end sample circuit, one end is connected to photovoltaic generating system negative pole end, other end ground connection, carries out sampling obtain the second sampled signal and input microprocessor 15 to photovoltaic generating system negative pole; The output terminal of insulating resistance value input circuit 16 connects microprocessor 15; Alarm output circuit 17 and alarm lamp circuit 18 are connected to the output terminal of microprocessor 15.
Positive terminal sample circuit as depicted in figs. 1 and 2, positive terminal sample circuit comprises the first sampling resistor 3 of one end ground connection, the other end of the first sampling resistor 3 connects two-way and exports, one tunnel exports and connects the first relay 8 and the first current-limiting resistance 4 in turn, first current-limiting resistance 4 is connected to the positive pole of photovoltaic arrays, and the coil of the first relay 8 is connected to microprocessor 15 and controls its current switching by microprocessor 15; Another road of first sampling resistor 3 exports and is connected with amplifying circuit 5, first voltage follower circuit 6 and the first filtering circuit 7 in the same way in turn, the output terminal of the first filtering circuit 7 connects microprocessor 15A/D and changes input port, amplifying circuit 5 is built by operational amplifier LM348 and resistance and is formed in the same way, operational amplifier LM348 in the same way input end connects the first sampling resistor 3, and reverse input end passes through resistance eutral grounding; First voltage follower circuit 6 is made up of operational amplifier OP484ES; First filtering circuit 7 is the filtering circuit that resistance and electric capacity build; First relay 8 comprises relay body and is connected to the coil control circuit of I/O interface of relay body and microprocessor 15.
Negative pole end sample circuit as shown in figures 1 and 3, negative pole end sample circuit comprises the second sampling resistor 9 of one end ground connection, the other end of the second sampling resistor 9 connects two-way and exports, one tunnel exports and connects the second relay 14 and the second current-limiting resistance 10 in turn, second current-limiting resistance 10 is connected to the negative pole of photovoltaic arrays, and the coil of the second relay 14 is connected to microprocessor 15 and controls its current switching by microprocessor 15; Another road of second sampling resistor 9 exports the output terminal being connected with reverse amplification circuit 11, second voltage follower circuit 12 and the second filtering circuit 13, second filtering circuit 13 in turn and connects microprocessor 15A/D conversion input port.Reverse amplification circuit 11 is built by operational amplifier LM348 and resistance and is formed, and operational amplifier LM348 reverse input end connects the first sampling resistor 3, and reverse input end passes through resistance eutral grounding; Second voltage follower circuit 12 is made up of operational amplifier OP484ES; Second filtering circuit 13 is the filtering circuit that resistance and electric capacity build; Second relay 14 comprises relay body and is connected to the coil control circuit of I/O interface of relay body and microprocessor 15.
Microprocessor 15 is also connected with insulating resistance value input circuit 16, alarm output circuit 17 and alarm lamp circuit 18, insulating resistance value input circuit 16 comprises the circuit that two 8421 scramblers are formed as shown in Figure 4, alarm output circuit 17 comprises two transistor output photoelectric coupling mechanism TLP281-4 as shown in Figure 6, and alarm lamp circuit 18 is built by two light emitting diodes and resistance and formed as shown in Figure 5.
Microprocessor 15 pairs of sampled signals calculate photovoltaic arrays positive pole ground insulation resistance and negative pole ground insulation resistance value, and compare with the setting value by insulating resistance value input circuit 16 input microprocessor 15, by the alarm output circuit 17 externally controller output alarm signal being connected to microprocessor 15.
The workflow of the present embodiment is: first only close the first relay 8, the voltage-to-ground of the first sampling resistor 3 in positive terminal sample circuit is input to microprocessor 15 by in-phase amplification circuit, the first voltage follower circuit 6 and the first filtering circuit 7 and carries out analog quantity to digital quantity conversion, obtains positive terminal sampling resistor magnitude of voltage;
Disconnect the first relay 8 again, only closed second relay 14, the voltage-to-ground of the second sampling resistor 9 in negative pole end sample circuit is input to microprocessor 15 by see-saw circuit, the second voltage follower circuit 12 and the second filtering circuit 13 and carries out analog quantity to digital quantity conversion, obtains negative pole end sampling resistor magnitude of voltage;
Last closed first relay 8 and the second relay 14 simultaneously, the voltage-to-ground value of the first sampling resistor 3 and the second sampling resistor 9, photovoltaic arrays positive pole is gone out to insulation impedance and negative pole ground insulation resistance by formulae discovery in microprocessor 15, the value calculated and setting value are compared, export finally by alarm lamp circuit 18 and alarm output circuit 17, when not needing to detect, positive and negative extreme relay all being disconnected, ensureing security of system stable operation.
As shown in Figure 7, it is as follows that microprocessor 15 calculates the method for photovoltaic arrays positive pole to insulation impedance Rx1 and negative pole ground insulation resistance Rx2: establish the resistance value of the first current-limiting resistance 4 and the second current-limiting resistance 10 to be R1, the resistance value of the first sampling resistor 3 and the second sampling resistor 9 is R2; First relay 8 is designated as K1, and the second relay 14 is designated as K2.
First square formation insulation impedance reference value R is input in microprocessor 15 by insulating resistance value input circuit 16.When the open-circuit voltage of photovoltaic DC-to-AC converter reaches entry condition, can send square formation insulation impedance measuring command, this order is input in microprocessor 15 by input signal, then microprocessor 15 can enter insulation impedance check processing program.
Microprocessor 15 sends closed first relay 8 and orders, and measures the voltage-to-ground of the first sampling resistor 3 as sampled voltage V after separated in time
1, obtain voltage V
1after, send disconnection first relay 8 and order, and send closed second relay 14 and order, measure the voltage-to-ground of the second sampling resistor 9 after separated in time as sampled voltage V
2, obtain voltage V
2after, send closed first relay 8 and the second relay 14 is ordered, measure the voltage-to-ground of the first sampling resistor 3 after separated in time as sampled voltage V ' simultaneously
1with the voltage-to-ground of the second sampling resistor 9 as sampled voltage V '
2.
When only closing the first relay 8 in above process, can obtain according to circuit theory:
When only closing the second relay 14 in above process, can obtain according to circuit theory:
By (1) formula and (2) Shi Ke get
Can find out from (3) and insulation impedance R will be calculated
x1and R
x2, wherein V
dcvalue obtain in the following manner, closed first relay 8 and the second relay 14, can obtain V according to circuit theory simultaneously
dcvalue be:
By the direct current V that (4) calculate
dcin formula that formula is brought into (3), can obtain after simplification
Finally the photovoltaic arrays positive pole insulation impedance and negative insulation resistance value that calculate gained are compared with the reference value R of the setting of insulating resistance value input circuit 16 input microprocessor 15, if lower than reference value R, represent that emulation insulation impedance breaks down, fault indication signal is made, by alarm output circuit 17 externally controller output fault-signal by alarm lamp; Otherwise export square formation insulation normal signal.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (8)
1. the square formation insulation impedance detection system of a photovoltaic generating system, it is characterized in that comprising: positive terminal sample circuit, one end is connected to photovoltaic generating system positive terminal, other end ground connection, carries out sampling to photovoltaic generating system positive pole and obtains the first sampled signal and input microprocessor (15); Negative pole end sample circuit, one end is connected to photovoltaic generating system negative pole end, other end ground connection, carries out sampling obtain the second sampled signal and input microprocessor (15) to photovoltaic generating system negative pole; The output terminal of insulating resistance value input circuit (16) connects microprocessor (15); Alarm output circuit (17) and alarm lamp circuit (18) are connected to the output terminal of microprocessor (15).
2. the square formation insulation impedance detection system of a kind of photovoltaic generating system according to claim 1, it is characterized in that: positive terminal sample circuit comprises first sampling resistor (3) of one end ground connection, the other end of the first sampling resistor (3) connects two-way and exports, one tunnel exports and connects the first relay (8) and the first current-limiting resistance (4) in turn, first current-limiting resistance (4) is connected to the positive pole of photovoltaic arrays, and the coil of the first relay (8) is connected to microprocessor (15) and controls its current switching by microprocessor (15); Another road of first sampling resistor (3) exports and is connected with amplifying circuit (5), the first voltage follower circuit (6) and the first filtering circuit (7) in the same way in turn, and the output terminal of the first filtering circuit (7) connects microprocessor (15) A/D and changes input port.
3. the square formation insulation impedance detection system of a kind of photovoltaic generating system according to claim 2, it is characterized in that: amplifying circuit (5) is built by operational amplifier LM348 and resistance and formed in the same way, operational amplifier LM348 in the same way input end connects the first sampling resistor (3), and reverse input end passes through resistance eutral grounding; First voltage follower circuit (6) is made up of operational amplifier OP484ES; The filtering circuit that first filtering circuit (7) builds for resistance and electric capacity; First relay (8) comprises relay body and is connected to the coil control circuit of I/O interface of relay body and microprocessor (15).
4. the square formation insulation impedance detection system of a kind of photovoltaic generating system according to claim 1, it is characterized in that: negative pole end sample circuit comprises second sampling resistor (9) of one end ground connection, the other end of the second sampling resistor (9) connects two-way and exports, one tunnel exports and connects the second relay (14) and the second current-limiting resistance (10) in turn, second current-limiting resistance (10) is connected to the negative pole of photovoltaic arrays, and the coil of the second relay (14) is connected to microprocessor (15) and controls its current switching by microprocessor (15); Another road of second sampling resistor (9) exports and is connected with reverse amplification circuit (11), the second voltage follower circuit (12) and the second filtering circuit (13) in turn, and the output terminal of the second filtering circuit (13) connects microprocessor (15) A/D and changes input port.
5. the square formation insulation impedance detection system of a kind of photovoltaic generating system according to claim 4, it is characterized in that: reverse amplification circuit (11) is built by operational amplifier LM348 and resistance and formed, operational amplifier LM348 reverse input end connects the first sampling resistor (3), and reverse input end passes through resistance eutral grounding; Second voltage follower circuit (12) is made up of operational amplifier OP484ES; The filtering circuit that second filtering circuit (13) builds for resistance and electric capacity; Second relay (14) comprises relay body and is connected to the coil control circuit of I/O interface of relay body and microprocessor (15).
6. the square formation insulation impedance detection system of a kind of photovoltaic generating system according to claim 1, is characterized in that: insulating resistance value input circuit (16) comprises the circuit that two 8421 scramblers are formed.
7. the square formation insulation impedance detection system of a kind of photovoltaic generating system according to claim 1, is characterized in that: alarm output circuit (17) comprises two transistor output photoelectric coupling mechanism TLP281-4.
8. the square formation insulation impedance detection system of a kind of photovoltaic generating system according to claim 1, it is characterized in that: microprocessor (15) is also connected with alarm lamp circuit (18), alarm lamp circuit (18) is built by two light emitting diodes and resistance and is formed.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356814A (en) * | 2017-06-01 | 2017-11-17 | 意昂神州（北京）科技有限公司 | A kind of insulaion resistance detecting system |
| CN108279331A (en) * | 2018-03-21 | 2018-07-13 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | A kind of photovoltaic DC-to-AC converter insulation resistance detection circuit and method |
| CN108445870A (en) * | 2018-04-02 | 2018-08-24 | 精进电动科技股份有限公司 | A kind of electric machine controller insulating monitoring circuit |
| CN110708016A (en) * | 2019-10-22 | 2020-01-17 | 阳光电源股份有限公司 | Method and device for monitoring insulation performance of photovoltaic grid-connected power generation system |
-
2013
- 2013-12-03 CN CN201320787627.7U patent/CN204044246U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356814A (en) * | 2017-06-01 | 2017-11-17 | 意昂神州（北京）科技有限公司 | A kind of insulaion resistance detecting system |
| CN108279331A (en) * | 2018-03-21 | 2018-07-13 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | A kind of photovoltaic DC-to-AC converter insulation resistance detection circuit and method |
| 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 |
| CN108445870A (en) * | 2018-04-02 | 2018-08-24 | 精进电动科技股份有限公司 | A kind of electric machine controller insulating monitoring circuit |
| US11448681B2 (en) | 2018-04-02 | 2022-09-20 | Jing-Jin Electric Technologies Co., Ltd. | Insulation monitoring circuit for motor controller |
| CN110708016A (en) * | 2019-10-22 | 2020-01-17 | 阳光电源股份有限公司 | Method and device for monitoring insulation performance of photovoltaic grid-connected power generation system |
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Effective date of registration: 20151030 Address after: 430033 Jiefang Avenue, Hubei, Wuhan, China, No. 717 Patentee after: NAVAL University OF ENGINEERING Patentee after: WUHAN NEW ENERGY INSTITUTE OF ACCESS EQUIPMENT & TECHNOLOGY Co.,Ltd. Address before: 430200 Hubei Province, Wuhan city Jiangxia District canglongdao Science Park chestnut Temple Road No. 18 Patentee before: Wuhan New Energy Institute of Access Equipment & Technology Co.,Ltd. |
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Granted publication date: 20141224 |