CN205246760U - Photovoltaic module array insulation against ground impedance detection circuitry - Google Patents
Photovoltaic module array insulation against ground impedance detection circuitry Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 50
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a photovoltaic module array insulation against ground impedance detection circuitry, the circuit includes positive bleeder circuit and burden bleeder circuit, positive bleeder circuit electricity connect in between photovoltaic array's the positive bus -bar and ground wire, burden bleeder circuit electricity connect in the ground wire with between photovoltaic array's the negative busbar, positive bleeder circuit's resistance value and/or burden bleeder circuit's resistance value is adjustable. With solve current detection scheme just, when negative busbar insulation against ground impedance difference is very big, the blind area is many, can not realize the problem of accurate detection insulation against ground impedance in full voltage range.
Description
Technical field
The utility model relates to photovoltaic power generation technology field, relates to particularly a kind of photovoltaic module array insulation against ground impedance detection method and circuit.
Background technology
Under the global context constantly worsening at current traditional energy growing tension and environment, find new alternative energy source and become by being important, and wherein the utilization of solar energy is particularly outstanding. The characteristics such as solar energy is renewable with it, aboundresources, security, clean energy resource are that people pay close attention to always. Along with not improving and the decline of application cost of photovoltaic power generation technology, photovoltaic generation oneself at global spread overwide areas, and under the advantage effect of various countries' policy, photovoltaic generation is current when being also in rapid growth.
From photovoltaic generation self-technique, although oneself is relatively ripe for current photovoltaic power generation technology, along with increasing and accumulated time of the on-the-spot application of product, some are originally that the problem of ignoring is also appeared suddenly relatively, and have obtained the attention of industry. And the positive and negative dc bus insulation against ground of the on-the-spot solar module square formation of photovoltaic resistance problems also just one of them.
Existing photovoltaic cell component drenches through long Exposure to Sunlight, water, and battery component and stube cable thereof may be aging, also have degradation problem under insulaion resistance. In addition, thunderbolt, field construction etc. all likely bring probabilistic damage to battery component, stube cable etc., it all will have can lead insulaion resistance decline, and as cable failure is exposed in earth, battery component damages the situation such as battery connecting piece and support short circuit that causes. Electrical safety angle with regard to electric power facility is considered, insulaion resistance crosses that minor issue may cause that straight-flow system is discharged over the ground, AC network see through inverter system to the too small place of DC terminal insulation against ground resistance discharge over the ground, the problem such as the straight negative busbar above earth potential of straight-flow system is unbalance, when the serious situation of problem, likely cause electricity generation system device failure, the grid-connected abnormal failure of combining inverter, net side transformer fault, so that situations such as electric network faults.
In view of above situation, be necessary to design an effective photovoltaic module array insulation against ground impedance detection method.
But in the existing application that realizes photovoltaic generation: be mainly summarised as several as follows:
(1) the on-the-spot solar module square formation of part photovoltaic is not to insulaion resistance measuring ability; (2) part inverter adopts fixed resistance access point platen press, and sampling partial pressure value, with fixing precognition epidemic situation comparison, realizes insulaion resistance analysis; (3) pulse voltage stack insulaion resistance detects; (4) part inverter adopts surely admittedly electric bridge access detection method, before sampling access electric bridge with access electric bridge after voltage condition, metering positive and negative busbar insulation against ground resistance, realizes insulaion resistance analysis;
Inventor is through research discovery, and above technical scheme all exists certain detection blind area, is less than threshold values equivalent risk thereby cause reporting by mistake impedance.
Summary of the invention
For overcome existing the utility model provide a kind of insulation against ground impedance detection circuit with solve existing detection scheme testing result inaccurate and detect blind zone problem.
For realizing above-mentioned object, the embodiment of the present application adopts following technical scheme:
A kind of photovoltaic module array insulation against ground impedance detection circuit, is characterized in that, described circuit comprises positive bleeder circuit and negative bleeder circuit;
Described positive bleeder circuit is electrically connected between the positive bus-bar and ground wire of described photovoltaic array, and described negative bleeder circuit is electrically connected between described ground wire and the negative busbar of described photovoltaic array; The resistance value of described positive bleeder circuit and/or the resistance value of described negative bleeder circuit are adjustable;
Positive bleeder circuit output comprises two resistance branch, for R1 branch road and the branch road that by R3 and R4 be composed in series in parallel with R1, the positive bus-bar PV+ of one end of the branch road that described R3 is composed in series with R4 and photovoltaic array be electrically connected and the other end through relay K 1 ground connection, on R4, be arranged in parallel relay K 3;
Negative bleeder circuit output comprises two resistance branch, for R2 branch road and the branch road that by R5 and R6 series arm formed in parallel with R2, one end of the branch road that described R5 is composed in series with R6 and the negative busbar PV-of photovoltaic array are electrically connected, the other end, through relay K 2 ground connection, is arranged in parallel relay K 4 on R5.
Preferably, foregoing circuit circuit, by the information of voltage before and after the resistance value conversion of sample described positive bleeder circuit and described negative bleeder circuit, processor calculates the resistance of positive bus-bar insulation against ground resistance and negative busbar insulation against ground resistance.
Preferably, foregoing circuit also comprises warning device.
Preferably, in the time that the output of described positive bleeder circuit and negative bleeder circuit comprises many branch roads, at least one branch road, switch is set.
Further, in the time that the output of described positive bleeder circuit and negative bleeder circuit comprises many branch roads, the in parallel switch that is provided with on the resistance of at least one branch road.
Further, above-mentioned switch is relay switch.
Preferably, foregoing circuit also comprises:
The power supply circuit of high isolation DC/DC power module composition;
Adopt the voltage signal sampling circuit of difference sampling and sampling with high precision resistance;
To external feedback signal with to fixed system detection signal module.
Further, said system circuit is also furnished with the long-range barrier communication system of RS485. Can support remote read-write and threshold threshold value setting by this communication system.
Preferably, described in said system circuit to external feedback signal with give fixed system detection signal module by RS485, switching value or or wireless mode and monitoring treatment facility carry out information interaction.
Preferably, also comprise signal protection clamp circuit in foregoing circuit, described signal protection clamp circuit is made up of two clamp diodes.
Preferably, the embodiment of the present invention also provides a kind of inverter, it is characterized in that, carries above-mentioned insulation impedance testing circuit, the positive pole of described dc source is electrically connected the positive pole of the direct-flow input end of described inverter, and the negative electricity of described dc source connects the negative pole of the direct-flow input end of described inverter.
Preferably, the embodiment of the present invention also provides a kind of photovoltaic module array insulation against ground impedance detection circuit method: described method comprises:
S1: detect action and start;
S2: sample positive bleeder circuit and negative bleeder circuit;
S3: determining step: according to S2 different mode down-sampling positive bus-bar voltage-to-ground value with ground to negative busbar magnitude of voltage, carry out pretreatment judgement and process rear Simultaneous Equations, go out positive busbar insulation against ground resistance R P and negative busbar insulation against ground resistance R N by solving equations, the minimum that RP and RN and photovoltaic module array the are allowed insulaion resistance RO comparison of being incorporated into the power networks
Work as RP > RO, RN > when RO, it is qualified to be judged to, processor output low level signal,
Otherwise be judged to defective, output high level signal.
Further, determine S1 method: be more than t1 and transfer to after low level continuous time when CPU receives system sense command signal input circuit low level, think and receive sense command.
When system detect DC voltage be greater than setting value U1 after t2s, think and receive sense command.
Further, above-mentioned S2 comprises:
As u1 > 0, u2 > 0 time, and 0.9≤(u1/u2)≤1.1, assert that the dc bus insulaion resistance degree of balance is close with bridge balance degree, enter pattern 1, closing relay K1, K2, K3, and detect now positive bus-bar voltage-to-ground u3, to negative busbar voltage u4;
When 1.3≤and (u1/u2) time, entering pattern 2, closed K1, disconnects K2, and detects u5, u6;
In the time of (u1/u2)≤0.7, enter mode 3, closed K2, disconnects K1, and detects u7, u8;
In the time of 1.1 < (u1/u2) < 1.3, enter pattern 4, closed K1, K3, disconnect K2, and detect u9, u10;
In the time of 0.7 < (u1/u2) < 0.9, enter pattern 5, closed K2, K4, disconnect K1, and detect u11, u12;
According to the information of voltage of sampling, calculate the resistance of positive bus-bar insulation against ground resistance and negative busbar insulation against ground resistance;
When detecting u1 > 0 and u2 > when 0 numerical exception, Mk system is abnormal, and deposits this information in storage device.
Preferably, resistance RP and the RN of 2 sampled values of above-mentioned memory device stores and insulaion resistance, get smaller value in result as final detection result.
Mechanism of the present invention is to utilize above-mentioned uneven bridge mode group, mainly by unbalanced resistance, relay switch composition, through detecting judgement, realize the switching of impedance under different proportion of becoming attached to over the ground of positive and negative busbar, obtain corresponding different conditions equation, Simultaneous Equations, solve positive and negative busbar insulation against ground impedance, make testing result precisely errorless.
Beneficial effect
A kind of photovoltaic module array insulation against ground impedance detection method and the circuit of this programme, to solve existing detection scheme in the time that positive and negative bus insulation against ground impedance difference is very large, blind area is many, can not realize the problem that accurately detects insulation against ground impedance in full voltage range.
Brief description of the drawings
To the embodiment of the present application and in conjunction with the description of its accompanying drawing, can further understand the purpose of this utility model, specific structural features and advantage by below. Wherein:
Fig. 1 is a kind of flow chart of photovoltaic module array insulation against ground impedance detection method;
Fig. 2 is a kind of system architecture diagram of photovoltaic module array insulation against ground impedance detection;
Fig. 3 is the equivalent schematic of a kind of photovoltaic module array of the present invention insulation against ground impedance detection circuit;
Fig. 4 is pattern 1 equivalent schematic of a kind of photovoltaic module array of the present invention insulation against ground impedance detection circuit;
Fig. 5 is pattern 2 equivalent schematic of a kind of photovoltaic module array of the present invention insulation against ground impedance detection circuit;
Fig. 6 is the mode 3 equivalent schematic of a kind of photovoltaic module array of the present invention insulation against ground impedance detection circuit;
Fig. 7 is pattern 4 equivalent schematic of a kind of photovoltaic module array of the present invention insulation against ground impedance detection circuit;
Fig. 8 is pattern 5 equivalent schematic of a kind of photovoltaic module array of the present invention insulation against ground impedance detection circuit.
Detailed description of the invention
The embodiment of the present application provides a kind of dustproof ventilating device of power station, for understanding better technique scheme, below in conjunction with Figure of description and embodiment thereof, technique scheme is described in detail.
Embodiment:
As shown in Figure 1, a kind of photovoltaic module array insulation against ground impedance detection method, described method comprises:
S1: detect action and start: be more than t1 and transfer to after low level continuous time when CPU receives system sense command signal input circuit low level, think and receive sense command (preferred t1 is 0.3S, and the t1 time also can optionally be set).
When system detects 60s (time also can optionally be set) after DC voltage is greater than U1 (preferably for 400V), think to receive sense command;
S2: the positive bleeder circuit of sampling (positive bus-bar voltage-to-ground value u1) and negative bleeder circuit (to negative busbar magnitude of voltage u2);
As u1 > 0, u2 > 0 time, and 0.9≤(u1/u2)≤1.1, assert that the dc bus insulaion resistance degree of balance is close with bridge balance degree, for pattern 1, now adopt the electric bridge mode that changes: closing relay K1, K2, K3, and detect now positive bus-bar voltage-to-ground u3, to negative busbar voltage u4;
When 1.3≤and (u1/u2) be upper and lower bridge imbalance, be pattern 2, now closed K1, disconnects K2, and detects u5, u6;
In the time of (u1/u2)≤0.7, be mode 3, closed K2, disconnects K1, and detects u7, u8;
In the time of 1.1 < (u1/u2) < 1.3, be pattern 4, closed K1, K3, disconnect K2, and detect u9, u10;
In the time of 0.7 < (u1/u2) < 0.9, be pattern 5, closed K2, K4, disconnect K1, and detect u11, u12
According to the information of sampling, set up equation and calculate RP and RN;
When detecting u1 > 0 and u2 > 0 numerical exception tense marker system exception,
And deposit this information in storage device (store sample value and insulating resistance value RP and RN, get smaller value in result of calculation as final detection result, improved accuracy in detection with a step).
S3: according to S2 different mode down-sampling positive bus-bar voltage-to-ground value with ground to negative busbar magnitude of voltage, carry out pretreatment judgement and process rear Simultaneous Equations, go out positive busbar insulation against ground resistance R P and negative busbar insulation against ground resistance R N by solving equations, the minimum that RP and RN and photovoltaic module array the are allowed insulaion resistance RO comparison of being incorporated into the power networks, work as RP > RO, RN > when RO, it is qualified to be judged to, processor output low level signal, otherwise be judged to defective, output high level signal, and judged result and resistance data are sent to control appliance, finish.
As the distortion of above-mentioned S3, also the information of the RP calculating, RN can be passed to control appliance and judge and control.
Technical descriptioon:
In such scheme, adopt balanced bridge insulaion resistance calculating method, system detects after u1, u2, u3, u4, u5, u6, u7, u8, u9, u10, u11, u12; Adopt electric bridge composite equation metering method: definition R1, R2, R3, R4, R5, R6 is that on unbalanced bridge, bridge joint enters resistance; RP, RN is respectively positive direct-current bus insulation against ground resistance, negative dc bus insulation against ground resistance; According to voltage divider principle, can detect RP and RN in conjunction with the equation group under different mode.
Composite equation is as follows: wherein R7=R1//R3, and R8=R2//(R5+R6), R9=R1//(R3+R4), R10=R2//R6, x=RP, y=RN. K1, K2, K3, K4 is input relay (it drives signal to be sent by processor).
When pattern 1 (equivalent circuit is referring to Fig. 4):
Pattern 2 (equivalent circuit is referring to Fig. 5):
Mode 3 (equivalent circuit is referring to Fig. 6):
Pattern 4 (equivalent circuit is referring to Fig. 7):
Pattern 5 (equivalent circuit is referring to Fig. 8):
As shown in Figure 2, a kind of photovoltaic module array insulation against ground impedance system circuit structure block diagram;
Photovoltaic module array insulation against ground impedance detection circuit system, comprises:
Unbalanced bridge pattern conversion group;
Adopt the differential voltage sample circuit of difference sampling and sampling with high precision resistance;
The power supply circuit of high isolation DC/DC power module composition;
Monitoring treatment facility;
Processor;
When system works, change the information of voltage of group by the uneven bridging of differential voltage sampling module collection, the real-time result of processing is given and monitored treatment facility by RS485 bus transfer after treated device processing; Monitoring treatment facility judges according to the information of accepting, and the real-time processor that feeds back to; Monitoring treatment facility also can pass through RS485 bus remote read-write and threshold threshold value setting;
The information interaction that isolation and reset are carried out in monitoring treatment facility and processing.
Fig. 3 is the equivalent schematic of photovoltaic module array insulation against ground impedance detection circuit;
A kind of photovoltaic module array insulation against ground impedance detection circuit system, comprises positive bleeder circuit and negative bleeder circuit;
Positive bleeder circuit is electrically connected between the positive bus-bar and ground wire of described photovoltaic array,
Described negative bleeder circuit is electrically connected between described ground wire and the negative busbar of described photovoltaic array;
The resistance value of described positive bleeder circuit and/or the resistance value of described negative bleeder circuit are adjustable;
Positive bleeder circuit output comprises 2 resistance branch, R1 branch road, and one end of R3 and R4 series arm (R1 in parallel and R3 and R4) and the positive bus-bar PV+ of photovoltaic array be electrically connected, relay K 1 ground connection that the other end is connected with R4 series arm through R3, is arranged in parallel relay K 3 on R4;
Negative bleeder circuit output comprises 2 resistance branch, R2 branch road, and one end of R5 and R6 series arm (R2 in parallel and R5 and R6) and the negative busbar PV of photovoltaic array-being electrically connected, relay K 2 ground connection that the other end is connected with R6 series arm through R5, are arranged in parallel relay K 4 on R5.
By detecting the system PV voltage (Un and Um) of foregoing circuit, can calculate the resistance of positive direct-current bus insulation against ground resistance and negative dc bus insulation against ground resistance by processor.
The embodiment of the present invention also provides a kind of inverter, comprise the insulation against ground impedance detection circuit described in above-described embodiment, the direct-flow input end of this inverter connects tested dc source, be the positive pole that the positive pole of tested dc source connects the direct-flow input end of this inverter, the negative pole of tested dc source connects the negative pole of the direct-flow input end of this inverter. The inverter that the present embodiment provides, can pass through this insulation against ground impedance detection circuit, realizes the accurate detection to inverter direct-current input power supplying insulation against ground impedance.
Technique effect:
The present embodiment provides a kind of photovoltaic module array insulation against ground impedance detection method and circuit, to solve existing detection scheme in the time that positive and negative bus insulation against ground impedance difference is very large, blind area is many, can not realize the problem that accurately detects insulation against ground impedance in full voltage range, by getting smaller value in twice result of calculation as final detection result, further improve accuracy in detection.
Above-described embodiment is only explanation technical conceive of the present utility model and feature, and its object is to allow person skilled in the art can understand content of the present utility model and implement according to this, can not limit protection domain of the present utility model with this. All equivalent transformations doing according to the utility model Spirit Essence or modification, within all should being encompassed in protection domain of the present utility model.
Claims (5)
1. a photovoltaic module array insulation against ground impedance detection circuit, is characterized in that, described circuit comprises positive bleeder circuit and negative bleeder circuit;
Described positive bleeder circuit is electrically connected between the positive bus-bar and ground wire of described photovoltaic array, and described negative bleeder circuit is electrically connected between described ground wire and the negative busbar of described photovoltaic array; The resistance value of described positive bleeder circuit and/or the resistance value of described negative bleeder circuit are adjustable;
Positive bleeder circuit output comprises two resistance branch, for R1 branch road and the branch road that by R3 and R4 be composed in series in parallel with R1, the positive bus-bar PV+ of one end of the branch road that described R3 is composed in series with R4 and photovoltaic array be electrically connected and the other end through relay K 1 ground connection, on R4, be arranged in parallel relay K 3;
Negative bleeder circuit output comprises two resistance branch, for R2 branch road and the branch road that by R5 and R6 series arm formed in parallel with R2, one end of the branch road that described R5 is composed in series with R6 and the negative busbar PV-of photovoltaic array are electrically connected, the other end, through relay K 2 ground connection, is arranged in parallel relay K 4 on R5.
2. circuit as claimed in claim 1, is characterized in that: described circuit also comprises warning device.
3. the circuit as described in any one in claim 1-2, is characterized in that: described circuit also comprises signal protection clamp circuit, described signal protection clamp circuit is made up of two clamp diodes.
4. the circuit as described in any one in claim 1-2, is characterized in that: described circuit also comprises
The power supply circuit of high isolation DC/DC power module composition;
Adopt the voltage signal sampling circuit of difference sampling and sampling with high precision resistance;
To external feedback signal with to fixed system detection signal module.
5. circuit as claimed in claim 4, is characterized in that: the described fixed system detection signal module of giving is by RS485, and switching value or wireless mode and monitoring treatment facility carry out information interaction.
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| CN201520614972.XU CN205246760U (en) | 2014-11-21 | 2015-08-14 | Photovoltaic module array insulation against ground impedance detection circuitry |
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| CN2014207081240 | 2014-11-21 | ||
| CN201420708124 | 2014-11-21 | ||
| CN201520614972.XU CN205246760U (en) | 2014-11-21 | 2015-08-14 | Photovoltaic module array insulation against ground impedance detection circuitry |
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| CN106443194A (en) * | 2016-09-30 | 2017-02-22 | 阳光电源股份有限公司 | Ground insulation impedance detection circuit for photovoltaic panel |
| CN106452358A (en) * | 2016-09-30 | 2017-02-22 | 阳光电源股份有限公司 | Insulation-against-ground impedance detection method and detection circuit for photovoltaic cell panel |
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| CN106841804A (en) * | 2016-12-07 | 2017-06-13 | 西安特锐德智能充电科技有限公司 | Insulation resistance detection circuit and detection method |
| CN107834978A (en) * | 2017-11-14 | 2018-03-23 | 珠海格力电器股份有限公司 | Photovoltaic array ground insulation impedance detection circuit and device and non-isolated photovoltaic inverter |
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| CN106443194B (en) * | 2016-09-30 | 2019-09-20 | 阳光电源股份有限公司 | Photovoltaic battery panel ground insulation impedance detection circuit |
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| CN106841804A (en) * | 2016-12-07 | 2017-06-13 | 西安特锐德智能充电科技有限公司 | Insulation resistance detection circuit and detection method |
| CN106841804B (en) * | 2016-12-07 | 2020-04-28 | 西安特锐德智能充电科技有限公司 | Insulation impedance detection circuit and detection method |
| CN106814294A (en) * | 2016-12-26 | 2017-06-09 | 浙江万马新能源有限公司 | Based on bilateral bridge direct-current charging post insulation detecting circuit and detection method |
| CN107834978B (en) * | 2017-11-14 | 2024-04-30 | 珠海格力电器股份有限公司 | Photovoltaic array earth insulation resistance detection circuit, device and non-isolated photovoltaic inverter |
| CN107834978A (en) * | 2017-11-14 | 2018-03-23 | 珠海格力电器股份有限公司 | Photovoltaic array ground insulation impedance detection circuit and device and non-isolated photovoltaic inverter |
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| CN109116281A (en) * | 2018-09-25 | 2019-01-01 | 北京长城华冠汽车科技股份有限公司 | A kind of diagnostic system and method for batteries of electric automobile group insulating resistor detecting circuit |
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