CN202710661U - DC grounding resistor detection circuit applied to photovoltaic inverter system - Google Patents
DC grounding resistor detection circuit applied to photovoltaic inverter system Download PDFInfo
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- CN202710661U CN202710661U CN 201220344512 CN201220344512U CN202710661U CN 202710661 U CN202710661 U CN 202710661U CN 201220344512 CN201220344512 CN 201220344512 CN 201220344512 U CN201220344512 U CN 201220344512U CN 202710661 U CN202710661 U CN 202710661U
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Abstract
The utility model relates to a DC grounding resistor detection circuit applied to a photovoltaic inverter system. The DC grounding resistor detection circuit applied to the photovoltaic inverter system of the scheme employs a DC detection method, real-timely detects the bus voltage of a DC power supply system, and enables the grounding resistor resistance to be measured accurately within a larger range via circuit operation. According to the utility model, an anode grounding resistor Rx is arranged between a bus anode PV+ and the ground, and the bus anode PV+ and a bus cathode PV- are sent to a logic processing circuit after passing corresponding filter circuits respectively, detecting the voltages of the bus anode PV+ and the bus cathode PV- and passing corresponding filter circuits respectively.
Description
Technical field
The utility model relates to a kind of DC ground resistance testing circuit that is applied to photovoltaic inverting system.
Background technology
In the prior art, DC power system is one of power supply important in photovoltaic plant, generating plant, the transformer station.When DC power system generation earth fault, may cause serious power system accident, so the dielectric level of DC power system is concerning the safe operation of electrical network, photovoltaic plant, generating plant and transformer station.At present, the main method of DC power system Earth Fault Detection has the detection method of interchange and dc detection method.Exchange detection method and be by applying an AC signal at bus, utilize AC current sensor to detect leakage current, thereby calculate stake resistance, its advantage is that bus or the positive ground connection of all ground connection branch roads or negative ground connection all can detect; Its shortcoming is to be subjected to system the impact of distributed capacitance is larger over the ground, needs complicated AC signal source, is also introducing interference when injecting AC signal to DC power system.Dc detection method is that a current-limiting resistance ground connection is passed through at positive and negative the two poles of the earth of bus, thereby the total voltage of DC power system is put on the positive and negative electrode insulation against ground resistance, produce a direct current electric current, by detecting this current value, can calculate system's positive and negative electrode resistance to earth value, its advantage is not to be subjected to the over the ground impact of distributed capacitance of system, does not need complicated AC signal source, do not produce interference, cost is low; Its shortcoming is all to detect stake resistance when positive ground connection or negative ground connection at single busbar grounding or all ground connection branch roads, simultaneously because of factors such as bus input voltage range, stake resistance Standard resistance range and precision, the stake resistance scope that can accurately calculate is less, the circuit parameter design difficulty.According to the relative merits of above-mentioned two kinds of detection methods, in conjunction with the characteristics of photovoltaic inverting system earth fault, using dc detection method is optimal selection, so the problem that dc detection method is applied to exist in the photovoltaic DC-to-AC converter system is to improve stake resistance Measurement accuracy scope.
The utility model content:
The utility model is for the deficiencies in the prior art, and a kind of DC ground resistance testing circuit that is applied to photovoltaic inverting system is proposed, this scheme adopts dc detection method, and detect in real time the DC power system busbar voltage, calculate by circuit, can be in a big way Measurement accuracy stake resistance resistance.
This programme is achieved by the following technical measures:
It mainly comprises: plus earth resistance R x is connected between the anodal PV+ of bus and the earth; Plus earth resistance detection filtering circuit, its positive input terminal is connected negative input end ground connection with the anodal PV+ of bus; Minus earth resistance detection filtering circuit, its negative input end is connected positive input terminal ground connection with bus negative pole PV-; The output terminal of plus earth resistance detection filtering circuit is connected with the input end of cathode voltage sample circuit, and the output terminal of minus earth resistance detection filtering circuit is connected with the input end of cathode voltage sample circuit; The output terminal of cathode voltage sample circuit is connected with the input end of positive signal filtering circuit, and the output terminal of cathode voltage sample circuit is connected with the input end of negative signal filtering circuit; The positive input terminal of busbar voltage sample circuit is connected with the anodal PV+ of bus, and negative input end is connected with bus negative pole PV-, and output terminal is connected with the input end of bus voltage signal modulate circuit; The output terminal of bus voltage signal modulate circuit is connected with the input end of bus voltage signal filtering circuit, and positive signal filtering circuit, negative signal filtering circuit and bus voltage signal filtering circuit are connected output terminal and are connected with logic processing circuit respectively.The characteristics of this programme are that described plus earth resistance detection filtering circuit is comprised of resistance and electric capacity, its physical circuit is, the end of the anodal PV+ connecting resistance of bus R1, the end of the other end connecting resistance R2 of resistance R 1, the end of while connecting resistance R5, another termination the earth of resistance R 2, capacitor C 1 is attempted by resistance R 2 two ends; Described minus earth resistance detection filtering circuit is comprised of resistance and electric capacity, its physical circuit is, the end of bus negative pole PV-connecting resistance R4, the end of the other end connecting resistance R3 of resistance R 4, the end of while connecting resistance R12, another termination the earth of resistance R 3, capacitor C 2 is attempted by resistance R 3 two ends; Described cathode voltage sample circuit is by resistance, electric capacity and operational amplifier K1A form, its physical circuit is, 4 pin of K1A connect+15V, 4 pin of capacitor C 4 one termination K1A, another termination power ground, 11 pin of K1A connect-15V, 11 pin of capacitor C 5 one termination K1A, another termination power ground, 3 pin of one termination K1A of resistance R 6, the other end of while connecting resistance R5, another termination power ground of resistance R 6, capacitor C 3 is attempted by resistance R 6 two ends, 2 pin of one termination K1A of resistance R 7, another termination the earth, 2 pin of a termination K1A of resistance R 8,1 pin of another termination K1A, capacitor C 6 are attempted by resistance R 8 two ends; Described cathode voltage sample circuit is comprised of resistance, electric capacity and operational amplifier K1B, its physical circuit is 5 pin of a termination K1B of resistance R 10, another termination the earth, 5 pin of one end K1B of resistance R 11, another termination power ground, capacitor C 8 are attempted by resistance R 11 two ends, 6 pin of a termination K1B of resistance R 12, the end of other end connecting resistance R4,6 pin of one termination K1B of resistance R 13,7 pin of another termination K1B, capacitor C 9 is attempted by resistance R 13 two ends; Described positive signal filtering circuit is comprised of resistance and electric capacity, and its physical circuit is, 1 pin of a termination K1A of resistance R 9, and an end of another termination capacitor C 7 connects logic processing circuit simultaneously, another termination power ground of capacitor C 7; Described negative signal filtering circuit is comprised of resistance and electric capacity, and its physical circuit is, 7 pin of a termination K1B of resistance R 14, and an end of another termination capacitor C 10 connects logic processing circuit simultaneously, another termination power ground of capacitor C 10; Described busbar voltage sample circuit is comprised of resistance and operational amplifier K1C, its physical circuit is, the end of the anodal PV+ connecting resistance of bus R15,10 pin of another termination K1C of resistance R 15, the end of bus negative pole PV-connecting resistance R16,9 pin of another termination K1C of resistance R 16,10 pin of one termination K1C of resistance R 17, another termination power ground, 9 pin of a termination K1C of resistance R 18,8 pin of another termination K1C; Described bus voltage signal modulate circuit is comprised of resistance, electric capacity and operational amplifier K1D, its physical circuit is, 8 pin of one termination K1C of resistance R 19,12 pin of another termination K1D, 12 pin of one termination K1D of resistance R 20, another termination power ground, capacitor C 11 is attempted by resistance R 20 two ends, 13 pin of one termination K1D of resistance R 21,14 pin of another termination K1D; Described bus voltage signal filtering circuit is comprised of resistance and electric capacity, and its physical circuit is 14 pin of a termination K1D of resistance R 22, the end of other end connecting resistance R23, connect simultaneously logic processing circuit, another termination power ground of resistance R 23, capacitor C 12 is attempted by resistance R 23 two ends; What described operational amplifier K1 adopted is that model is the operational amplifier of LM248.
Described busbar voltage sample circuit, cathode voltage sample circuit and cathode voltage sample circuit use respectively the voltage sensor sample circuit to replace.
The beneficial effect of this programme can be learnt according to the narration to such scheme, by detecting bus voltage signal, participates in stake resistance and calculates, so that the hardware circuit parameter designing is simple, is easy to debugging, and cost is low, can improve the grounding resistance measurement scope, and the derivation of equation is as follows:
Condition: R1=R4, R2=R3, V
C1=K1 * V1, V
C2=K2 * V2, V
PV+/-=K3 * V3, wherein K1, K2, K3 are the scale-up factor that is determined by the hardware circuit parameter.The cathode voltage signal that V2 obtains after representing to process through signal.
Rx is plus earth resistance, when Rx is not connected between positive pole and the earth,
When Rx is connected between positive pole and the earth,
By formula 1 and formula 2 as seen, V
C1Voltage is relevant with busbar voltage, when without stake resistance, and V
C1Voltage is along with the busbar voltage linear change; When stake resistance is arranged, and the stake resistance resistance is when constant, V
C1Voltage is equally along with the busbar voltage linear change, so only detecting V
C1Voltage signal V1 does not detect in the situation of bus voltage signal V3, can't determine the stake resistance resistance.
Can derive following formula by formula 2:
By formula 3 as seen, by detecting bus voltage signal V3, with cathode voltage signal V1 divided by V3 after, the available Rx(stake resistance resistance that contains) equation, can obtain definite stake resistance Rx resistance.
Description of drawings:
Fig. 1 is the circuit structure diagram of the utility model embodiment.
Fig. 2 is the circuit diagram of a kind of covert form of the utility model busbar voltage sample circuit.
Fig. 3 is the circuit diagram of the utility model cathode voltage sample circuit, a kind of covert form of cathode voltage sample circuit.
Embodiment:
In order to clearly demonstrate the technical characterstic of this programme, below by embodiment, and in conjunction with its accompanying drawing, this programme is set forth.
Can find out by accompanying drawing 1, a kind of DC ground resistance testing circuit that is applied to photovoltaic inverting system of this programme, mainly comprise plus earth resistance detection filtering circuit 2, its positive input terminal is connected with the anodal PV+ of bus, negative input end is connected with the earth, bus negative pole PV-is connected with the negative input end of minus earth resistance detection filtering circuit 3, the positive input terminal of minus earth resistance detection filtering circuit 3 is connected with the earth, the output terminal of plus earth resistance detection filtering circuit 2 is connected with the input end of cathode voltage sample circuit 4, the output terminal of minus earth resistance detection filtering circuit 3 is connected with the input end of cathode voltage sample circuit 5, the output terminal of cathode voltage sample circuit 4 is connected with the input end of positive signal filtering circuit 6, the output terminal of cathode voltage sample circuit 5 is connected with the input end of negative signal filtering circuit 7, the positive input terminal of busbar voltage sample circuit 8 is connected with the anodal PV+ of bus, its negative input end is connected with bus negative pole PV-, its output terminal is connected with the input end of bus voltage signal modulate circuit 9, the output terminal of bus voltage signal modulate circuit 9 is connected with the input end of bus voltage signal filtering circuit 10, positive signal filtering circuit 6, the output terminal that negative signal filtering circuit 7 is connected with the bus voltage signal filtering circuit is connected with logic processing circuit 11 respectively.
This programme physical circuit is connected to: described plus earth resistance detection filtering circuit 2 is comprised of resistance and electric capacity, its physical circuit is, the end of the anodal PV+ connecting resistance of bus R1, the end of the other end connecting resistance R2 of resistance R 1, the end of while connecting resistance R5, another termination the earth of resistance R 2, capacitor C 1 is attempted by resistance R 2 two ends; Described minus earth resistance detection filtering circuit 3 is comprised of resistance and electric capacity, its physical circuit is, the end of bus negative pole PV-connecting resistance R4, the end of the other end connecting resistance R3 of resistance R 4, the end of while connecting resistance R12, another termination the earth of resistance R 3, capacitor C 2 is attempted by resistance R 3 two ends; Described cathode voltage sample circuit 4 is by resistance, electric capacity and operational amplifier K1A form, its physical circuit is, 4 pin of K1A connect+15V, 4 pin of capacitor C 4 one termination K1A, another termination power ground, 11 pin of K1A connect-15V, 11 pin of capacitor C 5 one termination K1A, another termination power ground, 3 pin of one termination K1A of resistance R 6, the other end of while connecting resistance R5, another termination power ground of resistance R 6, capacitor C 3 is attempted by resistance R 6 two ends, 2 pin of one termination K1A of resistance R 7, another termination the earth, 2 pin of a termination K1A of resistance R 8,1 pin of another termination K1A, capacitor C 6 are attempted by resistance R 8 two ends; Described cathode voltage sample circuit 5 is comprised of resistance, electric capacity and operational amplifier K1B, its physical circuit is 5 pin of a termination K1B of resistance R 10, another termination the earth, 5 pin of one end K1B of resistance R 11, another termination power ground, capacitor C 8 are attempted by resistance R 11 two ends, 6 pin of a termination K1B of resistance R 12, the end of other end connecting resistance R4,6 pin of one termination K1B of resistance R 13,7 pin of another termination K1B, capacitor C 9 is attempted by resistance R 13 two ends; Described positive signal filtering circuit (6) is comprised of resistance and electric capacity, and its physical circuit is, 1 pin of a termination K1A of resistance R 9, and an end of another termination capacitor C 7 connects logic processing circuit 11 simultaneously, another termination power ground of capacitor C 7; Described negative signal filtering circuit 7 is comprised of resistance and electric capacity, and its physical circuit is, 7 pin of a termination K1B of resistance R 14, and an end of another termination capacitor C 10 connects logic processing circuit 11 simultaneously, another termination power ground of capacitor C 10; Described busbar voltage sample circuit 8 is comprised of resistance and operational amplifier K1C, its physical circuit is, the end of the anodal PV+ connecting resistance of bus R15,10 pin of another termination K1C of resistance R 15, the end of bus negative pole PV-connecting resistance R16,9 pin of another termination K1C of resistance R 16,10 pin of one termination K1C of resistance R 17, another termination power ground, 9 pin of a termination K1C of resistance R 18,8 pin of another termination K1C; Described bus voltage signal modulate circuit 9 is comprised of resistance, electric capacity and operational amplifier K1D, its physical circuit is, 8 pin of one termination K1C of resistance R 19,12 pin of another termination K1D, 12 pin of one termination K1D of resistance R 20, another termination power ground, capacitor C 11 is attempted by resistance R 20 two ends, 13 pin of one termination K1D of resistance R 21,14 pin of another termination K1D; Described bus voltage signal filtering circuit 10 is comprised of resistance and electric capacity, and its physical circuit is 14 pin of a termination K1D of resistance R 22, the end of other end connecting resistance R23, connect simultaneously logic processing circuit 11, another termination power ground of resistance R 23, capacitor C 12 is attempted by resistance R 23 two ends; What described operational amplifier K1 adopted is that model is the operational amplifier of LM248.
The plus earth resistance R
xThe anodal DC ground resistance to be measured of 1 expression bus; The effect of plus earth resistance detection filtering circuit 2 is that the bus positive pole is converted to low voltage signal to the high voltage signal of the earth, and this signal carries out being used for the bus cathode voltage after filtering is processed and detects; Minus earth resistance detection filtering circuit 3 effect is that the bus negative pole is converted to low voltage signal to the high voltage signal of the earth, and this signal carries out being used for the bus cathode voltage after filtering is processed and detects; The effect of cathode voltage sample circuit 4 is to gather the anodal low voltage signal of bus, is converted to weak electric signal; The effect of cathode voltage sample circuit 5 is to gather bus negative pole low voltage signal, is converted to weak electric signal; The effect of positive signal filtering circuit 6 is to the filtering of bus cathode voltage weak electric signal; The effect of negative signal filtering circuit 7 is to the filtering of bus cathode voltage weak electric signal; The effect of busbar voltage sample circuit 8 is that busbar voltage is carried out Real-time Collection; The effect of bus voltage signal modulate circuit 9 is that the busbar voltage collection signal is carried out filtering and signal voltage transitions; The effect of bus voltage signal filtering circuit 10 is to bus voltage signal filtering; The effect of logic processing circuit 11 is after bus cathode voltage signal, bus cathode voltage signal and bus voltage signal are compared, by calculating the stake resistance resistance, judge whether bus positive pole or bus negative pole connect the earth, afterwards output ground fault signal and stake resistance resistance parameter.
Claims (9)
1. a DC ground resistance testing circuit that is applied to photovoltaic inverting system is characterized in that, it mainly comprises:
Plus earth resistance R x is connected between the anodal PV+ of bus and the earth;
Plus earth resistance detection filtering circuit (2), its positive input terminal is connected negative input end ground connection with the anodal PV+ of bus;
Minus earth resistance detection filtering circuit (3), its negative input end is connected positive input terminal ground connection with bus negative pole PV-;
The output terminal of plus earth resistance detection filtering circuit (2) is connected with the input end of cathode voltage sample circuit (4), and the output terminal of minus earth resistance detection filtering circuit (3) is connected with the input end of cathode voltage sample circuit (5);
The output terminal of cathode voltage sample circuit (4) is connected with the input end of positive signal filtering circuit (6), and the output terminal of cathode voltage sample circuit (5) is connected with the input end of negative signal filtering circuit (7);
The positive input terminal of busbar voltage sample circuit (8) is connected with the anodal PV+ of bus, and negative input end is connected with bus negative pole PV-, and output terminal is connected with the input end of bus voltage signal modulate circuit (9);
The output terminal of bus voltage signal modulate circuit (9) is connected with the input end of bus voltage signal filtering circuit (10), and positive signal filtering circuit (6), negative signal filtering circuit (7) are connected 10 with the bus voltage signal filtering circuit) output terminal be connected with logic processing circuit (11) respectively.
2. the DC ground resistance testing circuit that is applied to photovoltaic inverting system as claimed in claim 1, it is characterized in that, described busbar voltage sample circuit (8) comprising: an operational amplifier K1C, its positive terminal is connected with resistance R 15, resistance R 17 1 ends respectively, another termination power ground of resistance R 17, the other end of resistance R 15 is connected with the anodal PV+ of bus; Its negative pole end is connected with resistance R 16, resistance R 18 1 ends respectively, and the other end of resistance R 16 is connected with bus negative pole PV-, the output terminal of another termination K1C of resistance R 18.
3. the DC ground resistance testing circuit that is applied to photovoltaic inverting system as claimed in claim 1, it is characterized in that, described cathode voltage sample circuit (4) comprising: an operational amplifier K1A, its positive terminal is connected with resistance R 5, resistance R 6, capacitor C 3 one ends respectively, wherein the other end of resistance R 5 is connected the other end of resistance R 6, capacitor C 3 and joining power ground with plus earth resistance detection filtering circuit (2) output terminal; Its negative pole end is connected with resistance R 7, resistance R 8, capacitor C 6 one ends respectively, another termination the earth of resistance R 7, and the other end of resistance R 8, capacitor C 6 also connects the output terminal of K1A.
4. the DC ground resistance testing circuit that is applied to photovoltaic inverting system as claimed in claim 3 is characterized in that, the positive power source terminal of described operational amplifier K1A is connected with+15V power supply, and this end also connects power supply ground through capacitor C 4 simultaneously; Negative power end is connected with-15V power supply, and this end also connects power supply ground through capacitor C 5 simultaneously.
5. the DC ground resistance testing circuit that is applied to photovoltaic inverting system as claimed in claim 1, it is characterized in that, described cathode voltage sample circuit (5) comprising: an operational amplifier K1B, its positive terminal respectively with resistance R 10, resistance R 11, capacitor C 8 one ends connect, another termination the earth of resistance R 10 wherein, resistance R 11, the other end of capacitor C 8 and joining power ground, its negative pole end respectively with resistance R 12, resistance R 13, capacitor C 9 one ends connect, the other end of resistance R 12 is connected resistance R 13 with minus earth resistance detection filtering circuit (3) output terminal, the other end of capacitor C 9 also connects the output terminal of K1B.
6. the DC ground resistance testing circuit that is applied to photovoltaic inverting system as claimed in claim 1, it is characterized in that, described busbar voltage sample circuit (8), cathode voltage sample circuit (4) and cathode voltage sample circuit (5) use respectively the voltage sensor sample circuit to replace.
7. the DC ground resistance testing circuit that is applied to photovoltaic inverting system as claimed in claim 1, it is characterized in that, described plus earth resistance detection filtering circuit (2) comprises a resistance R 1, one end of resistance R 1 is connected with the anodal PV+ of bus, the other end is connected another termination the earth of resistance R 2, capacitor C 1 with resistance R 2, capacitor C 1 one ends of parallel connection;
Described minus earth resistance detection filtering circuit (3) comprises a resistance R 4, and an end of resistance R 4 is connected with bus negative pole PV-, and the other end is connected resistance R 3, capacitor C 2 another termination the earth with resistance R 3, capacitor C 2 one ends of parallel connection.
8. the DC ground resistance testing circuit that is applied to photovoltaic inverting system as claimed in claim 1, it is characterized in that, described positive signal filtering circuit (6) comprises resistance R 9, its end is connected with cathode voltage sample circuit (4) output terminal, the other end is connected with the logic processing circuit input end with capacitor C 7, capacitor C 7 another termination power ground;
Described negative signal filtering circuit (7) comprises resistance R 14, and its end is connected with cathode voltage sample circuit (5) output terminal, and the other end is connected with the logic processing circuit input end with capacitor C 10, capacitor C 10 another termination power ground.
9. the DC ground resistance testing circuit that is applied to photovoltaic inverting system as claimed in claim 1 is characterized in that, described logic processing circuit output ground fault signal and stake resistance resistance signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220344512 CN202710661U (en) | 2012-07-16 | 2012-07-16 | DC grounding resistor detection circuit applied to photovoltaic inverter system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220344512 CN202710661U (en) | 2012-07-16 | 2012-07-16 | DC grounding resistor detection circuit applied to photovoltaic inverter system |
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| CN202710661U true CN202710661U (en) | 2013-01-30 |
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| CN 201220344512 Withdrawn - After Issue CN202710661U (en) | 2012-07-16 | 2012-07-16 | DC grounding resistor detection circuit applied to photovoltaic inverter system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749523A (en) * | 2012-07-16 | 2012-10-24 | 山东奥太电气有限公司 | Direct-current ground resistance detection circuit applied to photovoltaic inverter system |
| CN103944506A (en) * | 2013-12-26 | 2014-07-23 | 中国电子科技集团公司第四十一研究所 | Photovoltaic array grounding impedance detection system and method |
| CN110709719A (en) * | 2017-12-15 | 2020-01-17 | 株式会社Lg化学 | Method and apparatus for detecting battery leakage |
| CN117007911A (en) * | 2023-09-27 | 2023-11-07 | 陕西陶网新智软件科技有限公司 | Fault detection device, system and use method of Direct Current (DC) bus line |
-
2012
- 2012-07-16 CN CN 201220344512 patent/CN202710661U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749523A (en) * | 2012-07-16 | 2012-10-24 | 山东奥太电气有限公司 | Direct-current ground resistance detection circuit applied to photovoltaic inverter system |
| CN103944506A (en) * | 2013-12-26 | 2014-07-23 | 中国电子科技集团公司第四十一研究所 | Photovoltaic array grounding impedance detection system and method |
| CN103944506B (en) * | 2013-12-26 | 2017-01-04 | 中国电子科技集团公司第四十一研究所 | The detecting system of a kind of photovoltaic array impedance ground and method |
| CN110709719A (en) * | 2017-12-15 | 2020-01-17 | 株式会社Lg化学 | Method and apparatus for detecting battery leakage |
| CN110709719B (en) * | 2017-12-15 | 2021-12-07 | 株式会社Lg化学 | Method and apparatus for detecting battery leakage |
| CN117007911A (en) * | 2023-09-27 | 2023-11-07 | 陕西陶网新智软件科技有限公司 | Fault detection device, system and use method of Direct Current (DC) bus line |
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Granted publication date: 20130130 Effective date of abandoning: 20141210 |
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