CN203135757U - Novel intelligent supervising device for photovoltaic confluence box - Google Patents
Novel intelligent supervising device for photovoltaic confluence box Download PDFInfo
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Abstract
The utility model discloses a novel intelligent supervising device for a photovoltaic confluence box, comprising a basic assembly and a selective assembly connected with the basic assembly. The basic assembly comprises a string current acquisition unit; the selective assembly comprises at least one of a string voltage acquisition unit, a network communication interface unit, a wireless communication interface unit, an external sensor interface unit, a self-power power supply module, an export voltage current sampling unit and an input/output interface unit. According to the technical scheme provided in the embodiment, a function modularization design idea is employed, the novel intelligent supervising device for the photovoltaic confluence box comprises the basic assembly and the selective assembly, the function of each assembly is relatively independent, assembling is freely selected according to requirements, the functions are various, assemblies are selective, the novel intelligent supervising device is suitable for various application occasions, and cost is low.
Description
Technical field
The utility model relates to photovoltaic generation header box technical field, is specifically related to a kind of novel photovoltaic header box intelligence monitoring and controlling device.
Background technology
The photovoltaic header box is the headend equipment of photo-voltaic power generation station, is installed on outdoor adverse circumstances and enormous amount more, and distributed areas are wide, are not easy to administer and maintain.Intelligence header box supervising device to be managed and is monitored and design the remote zone of header box in order to realize.
Header box supervising device in the market is of a great variety, and function is different, and is in the majority with the supervising device of simple collection group crosstalk stream function, can't satisfy various on-the-spot functional requirements comprehensively; Various products with function difference differentiation model can cause model various again, are unfavorable for producing in enormous quantities.And, if the integrated too much useless function of supervising device can cause increasing of cost again and waste.
To sum up, existing header box supervising device has function singleness and highly integrated characteristics, causes model various, does not have universality, and with high costs.
The utility model content
In view of this, the utility model embodiment provides a kind of novel photovoltaic header box intelligence monitoring and controlling device, and is various to solve existing header box supervising device model, do not have universality, and technical problem with high costs.
For this reason, the utility model embodiment provides a kind of novel photovoltaic header box intelligence monitoring and controlling device, comprising: basic module, and the optional components that is connected with described basic module; Described basic module comprises group crosstalk stream collecting unit; Described optional components comprises that the group crosstalk presses collecting unit, network communication interface unit, wireless communication interface unit, external sensor interface unit, self powered supply module, remittance abroad electric current and voltage sampling unit, and in the input/output interface unit at least one.
The utility model embodiment technical scheme adopts the design philosophy of function modoularization, the photovoltaic header box intelligence monitoring and controlling device that provides is made of basic module and optional components, function opposite independent between each assembly, can freely select assembling as required, thereby has diverse in function, assembly is optional, adapts to various application scenarios, and technique effect with low cost.
Description of drawings
Fig. 1 is the schematic diagram of the novel photovoltaic header box intelligence monitoring and controlling device that provides of the utility model embodiment;
Fig. 2 is the schematic diagram of the novel photovoltaic header box intelligence monitoring and controlling device in the application scenarios example;
Fig. 3 is the schematic diagram of group crosstalk stream collecting unit;
Fig. 4 is the schematic diagram that collecting unit is pressed in the group crosstalk;
Fig. 5 is the schematic diagram of external sensor interface unit;
Fig. 6 is the schematic diagram of three-wire system PT100 sample circuit in the external sensor interface unit;
Fig. 7 is photovoltaic header box major loop equivalent circuit diagram;
Fig. 8 is fuse fault warning orientation criterion logical schematic;
Fig. 9 is the schematic diagram of the online school of current transformer zero method.
Embodiment
The utility model embodiment provides a kind of novel photovoltaic header box intelligence monitoring and controlling device, can freely select each optional components of assembling as required, thereby solve existing header box supervising device function singleness, highly integrated, do not have universality, and technical problem with high costs.Be elaborated below in conjunction with accompanying drawing.
Embodiment one,
Please refer to Fig. 1, the utility model embodiment provides a kind of novel photovoltaic header box intelligence monitoring and controlling device, comprising: basic module 110, and the optional components 120 that is connected with described basic module; Described basic module 110 comprises group crosstalk stream collecting unit; Described optional components 120 comprises that the group crosstalk presses collecting unit, network communication interface unit, wireless communication interface unit, external sensor interface unit, self powered supply module, remittance abroad electric current and voltage sampling unit, and in the input/output interface unit at least one.
Optionally, described optional components is connected with described group of crosstalk stream collecting unit by the plug and play mode, thereby makes the user select assembling or dismounting, the novel photovoltaic header box intelligence monitoring and controlling device that obtains corresponding to actual needs according to the practical application needs.
More than, the utility model embodiment provides a kind of novel photovoltaic header box intelligence monitoring and controlling device, this device adopts idea of modular, be made of basic module and optional components, function opposite independent between each assembly can freely be selected assembling as required, thereby has diverse in function, assembly is optional, adapts to various application scenarioss, and technique effect with low cost.
Embodiment two,
Please refer to Fig. 2, in the application scenarios example, described novel photovoltaic header box intelligence monitoring and controlling device specifically comprises: group crosstalk stream collecting unit 1, and collecting unit 6 is pressed in the group crosstalk, network communication interface unit 4, wireless communication interface unit 2, external sensor interface unit 5 and self powered supply module 3.
In other application scenarios example, described device can also comprise remittance abroad electric current and voltage sampling unit or input/output interface unit.
Below respectively each last assembly is elaborated:
1, group crosstalk stream collecting unit
Described group of crosstalk stream collecting unit is mainly used in the real-time sampling to photovoltaic cell group crosstalk stream, is the core component of described device, is the minimum system of realizing the header box monitoring function, and basic functions is provided; As data management terminal and the communication of backstage, a distant place.
Concrete, can be by Hall current sensor real-time sampling group crosstalk stream; Show various parameters on the spot by the charactron as 57 segmentations; Gather the total remittance abroad voltage and current of header box in real time and calculate power output, the electric weight of header box and power output and the electric weight of organizing string; 3 tunnel switching value input and output of isolating are provided, are used as the state of monitoring header box fuse and circuit breaker and export switch control and the alarm idle contact; One tunnel RS485 remote communication interface of isolating, remote measurement, the distant control function of realization header box.
Further, described Hall element can adopt traditional punching Hall element or chip-shaped Hall element.Further, described current acquisition unit can adopt one to overlap 5 volts of power supplys of system that independently Switching Power Supply output is isolated, and makes it to isolate with electric the going up of all external function assemblies.
Please refer to Fig. 3, described group of crosstalk stream collecting unit can comprise: the Hall current sensor 19 of Lian Jieing successively, and low pass filtered involves commutation circuit 7, analog to digital converter ADC8 and microcontroller MCU9, and the high pressure sample circuit 23 that is connected with microcontroller MCU respectively, total current sampling unit 18, switching value input 13, switching value output 14, auxiliary communication interface 15, Ethernet interface 11, sensor interface 12,485 communication interfaces 10, display button 9 and wave point 18, and self-powered module 22 etc.
Wherein, described high pressure sample circuit 23 adopts linear optical coupling to isolate, and described total current sampling unit 18 employing copped waves are carried out high-accuracy high-gain from steady zero amplifier to the shunt signal and amplified.Described total current sampling unit 18 is as the calculating of header box power output, electric weight, and the critical parameter that also can be used as fuse fault warning and location generates.Described self-powered module directly has the crosstalk of photovoltaic group to press power supply, 24 volts of 10W direct voltages of output, by 24 volts of Power Management Unit isolate one tunnel 5 volt of power supply stream of output collecting unit use, the one tunnel 5 volt isolate for total remittance abroad voltage that sampling is used, the one tunnel 5 volt for the use of RS485 isolation communication interface.
Press collecting unit, described external sensor interface unit and wireless communication interface unit interaction data by described auxiliary communication interface and described group of crosstalk; Press the group crosstalk of collecting unit to press the relation of data and remittance abroad electric current and voltage data to convert by reading described group of crosstalk, judge whether fuse has fault and abort situation is effectively located; By the supervision of remittance abroad electric current and the relatively realization of group crosstalk pressure and remittance abroad voltage current sensor is carried out online school zero; And provide estimation, the group crosstalk pond failure judgment of group string power, electric weight.
2, collecting unit is pressed in the group crosstalk
Collecting unit is pressed in described group of crosstalk, is an independently functional unit, is mainly used in the real-time sampling to photovoltaic cell group crosstalk pressure, and carries out data interaction with described group of crosstalk stream sampling unit.Concrete, the isolation collection that 16 road photovoltaic cell group crosstalks are pressed can be provided, 32 fuse fault location indicator lights are provided, can be by auxiliary communication interface and its interaction data of group crosstalk stream collecting unit, plug-and-play feature is supported in calculating and the fault warning of header box fuse and the location of realization group string power, electric weight.Described group of crosstalk stream collecting unit is issued to described group of crosstalk with the fuse malfunction of header box and fault location information and presses collecting unit in order to show fault and locating information on the spot.
As shown in Figure 4; described group of crosstalk presses collecting unit to comprise: sampled voltage input lightning protection circuit 27; second class protection and filter circuit 28; electronic switch commutation circuit 29, linear optical coupling buffer circuit 30, ADC sample circuit 31; microcontroller MCU 32; indicator light 33, communication port 34, and Power Management Unit 35.Described microcontroller MCU 32 specifically can be single-chip microcomputer.As seen, described group of crosstalk presses the high pressure input channel of acquisition module to adopt lightning protection design and the measure of enforcement second class protection, and the high voltage sampling uses linear optical coupling to isolate.
3, external sensor interface unit
Described external sensor interface unit is an independently functional unit, is used for realizing the independent collection of external analog amount, can comprise illuminance sensor, PT100 thermal resistance, air flow sensor etc.; The interface that is fit to most analog quantity output type environmental sensors can be by auxiliary communication interface and its interaction data of group crosstalk stream collecting unit 1; Support plug-and-play feature.
Further, all analog input channels of described external sensor interface unit can adopt the photoelectricity isolation design to strengthen the interference free performance of system, and wherein the PT1000 temperature sensor interface can adopt the three-wire system connection of isolation.
As shown in Figure 5, described external sensor interface unit comprises: the signal conditioning circuit of isolation, single-chip microcomputer and ADC change-over circuit, communication interface, and power management module.
As shown in Figure 6, the PT100 resistance and temperature in the described external sensor interface unit is gathered, and adopts the three-wire system connection, comprising: 1mA constant-current source circuit 31, inject stable 1mA electric current to outside PT100 thermal resistance; Signal conditioning circuit 32 realizes eliminating the error that goes between, the pressure drop at output PT100 two ends, i.e. Upt100=Rpt100*1mA.
Described external sensor interface can provide 4-20mA isolation measurement interface, 10mV and 100mV, 10V isolation measurement interface, 24 volts of power supplies to import, pass through auxiliary communication port and its interaction data of current acquisition unit.
4, self powered supply module
Described self powered supply module, be the Power Management Unit of wide region input multichannel output, adopt wide region input photovoltaic power source special adapter, 200 ~ 1200 volts of direct current inputs, 24 volts of 10 watts of outputs need not outside civil power or the input of other power supply adaptors by the direct power supply of on-the-spot photovoltaic cell group; Can press the collecting unit power supply to group crosstalk stream collecting unit, wireless communication interface unit, external sensor interface unit, group crosstalk.
5, other assembly
Described network communication interface unit is used for realizing header box ethernet communication and embedded type WEB SERVER function.Optionally, described network communication interface inserts described group of crosstalk stream collecting unit by the SPI interface in the mode of network interface card module plug and play, realizes Ethernet networking and the embedded type WEB SERVER function of header box.Can adopt independently network interface card modular design support plug-and-play feature.
Described wireless communication interface unit, be used for satisfying the on-the-spot occasion that needs wireless telecommunications, support the wireless telecommunications of zigbee, GPRS wireless telecommunications, 11 channels of 433MHz ~ 915MHz, ISM(Industrial Scientific and Medical for example, industry, science and medical science) the BAND wireless telecommunications; Can carry out data interaction with it by the auxiliary communication port of described group of crosstalk stream collecting unit, support plug-and-play feature.
Described remittance abroad electric current and voltage sampling unit is used for the voltage and current of the total bus-bar of header box is gathered in real time, can realize fuse alarm and fault location function and the online zero correction function of current sensor by carrying out data interaction with group crosstalk stream collecting unit.Described remittance abroad current sampling unit adopts high accuracy to carry out accurate high power and amplify being serially connected in shunt voltage on the output bus-bar from steady zero simulated modulation circuit, and its function is as the calculating parameter of header box power output, electric weight, also as the parameter of the fault warning of header box fuse and orientation criterion, play a crucial role current transformer being done online school zero simultaneously.
Described input/output interface unit is used for gathering in real time the state of header box master switch and lightning protection device and to the control of external switch.
More than, each assembly of the utility model embodiment device is had been described in detail.Wherein, collecting unit etc. is pressed in described network communication interface unit, described external sensor interface unit, described wireless communication interface unit, described group of crosstalk, all adopt the standalone feature assembly design, functional unit crop configuration flexibly is provided, be conducive to the header box product function recombinate, be conducive to cost optimization, reduce the production management cost, be conducive to large-scale production.
As seen, technical solutions of the utility model adopt function modoularization, but the mentality of designing of assembly flexible configuration cutting, the novel photovoltaic header box intelligence monitoring and controlling device that provides is made of basic module and optional components, and function opposite independent between each assembly can freely be selected assembling as required, thereby has diverse in function, assembly is optional, adapts to various application scenarioss, and technique effect with low cost.The present embodiment device has very high cost performance, very strong market adaptability and price competitiveness; Simplify the product type specification simultaneously and reduced production cost and management cost.
Embodiment three,
The utility model embodiment also provides the method for the fault warning of a kind of header box fuse and location.
Please refer to the equivalent electric circuit of photovoltaic header box shown in Figure 7, U1, U2-U16 press sampled point for the group crosstalk, and I1-I16 is group crosstalk stream sampled value.FUSi-, FUSi(i=1-16) be respectively negative terminal and the anode fuse of i group string.For each group string fuse fault three kinds of situations are arranged: negative terminal fuse fault, anode fuse fault and the equal fault of positive and negative terminal fuse.
Described method comprises: described group of crosstalk stream collecting unit is by analyzing the group crosstalk stream that self collects, total remittance abroad voltage and current and obtain described group of crosstalk by described auxiliary communication interface and press the magnitude relationship of the measured group crosstalk of collecting unit between pressing to generate a series of logical condition, and fault warning and fault location information by a series of logic judgement fuse output.Please refer to Fig. 8, algorithm is as described below in other words to the criterion of these three kinds of faults:
(1) criterion of the equal fault of positive and negative terminal fuse: (judged by the external light intensity transducer) under the good situation of illuminance by day, as sampled point Uk(k=1-16) when being 0, just can judge the positive and negative fuse fault that the K group is gone here and there; Logical combination is shown in Fig. 8 " criterion one ";
(2) negative terminal fuse failure criterion: (judged by the external light intensity transducer) under the good situation of illuminance by day, and the state of generating electricity by way of merging two or more grid systems (be not 0 to be generate electricity by way of merging two or more grid systems state as long as one tunnel group crosstalk stream is arranged); If k road electric current is Ik=0(k=1-16), and the voltage on k road equal total remittance abroad voltage (it is not that Uo are pressed in other any one tunnel group crosstalks of 0 that total remittance abroad voltage equals electric current) be Uk=Uo(o＜K, Io＜0).Can judge k road group string negative terminal or fuse fault (can not determine it is which end); Logical combination is shown in 8 figure " criterion two ";
(3) anode fuse failure criterion: (judged by the external light intensity transducer) under the good situation of illuminance by day, and the state of generating electricity by way of merging two or more grid systems (be not 0 to be generate electricity by way of merging two or more grid systems state as long as one tunnel group crosstalk stream is arranged); If k road electric current is Ik=0(k=1-16), and the voltage U k on k road is not equal to 0, and Uk＜Uo.Can judge k road group string anode fuse fault; Logical combination is shown in Fig. 8 " criterion three ".
The header box fault type much shows the fault of fuse, because overcurrent causes the oxidation of blowing of fuse or long-time running, in transit loosening to cause fuse loose contact so that local pyrexia and burns the PCB cabling or the fuse bearing, if can not in time find the fuse fault, will cause the waste of photovoltaic group string resource, even expendable fault such as cause that the header box part is burnt, and prolong maintenance cycle.
The present embodiment method adopts described group of crosstalk stream collecting unit and the described group of sampled value that crosstalk is pressed collecting unit and cooperated total remittance abroad voltage and current, can effectively judge header box fuse fault and fault location position.Solved the problem that existing header box supervising device can't carry out fuse fault warning and location.
Embodiment four,
The utility model embodiment also provides the method in the online school of a kind of header box current sensor zero.
As shown in Figure 9, described method comprises: described group of crosstalk stream collecting unit is by gathering the remittance abroad current value, be under zero the situation at the remittance abroad electric current, perhaps organizing crosstalk forces down when total remittance abroad voltage, read current transformer that each group gangs up or the output of respective channel, namely instrument transformer at that time is worth zero point, the value at corresponding zero point of preserving with system rom (EEPROM) compares, judge whether to have taken place zero migration, if skew is transfinited, then old value at zero point is covered and adopts new correcting algorithm.Guarantee that current transformer does not influence sampling precision owing to reasons such as ambient temperature, self-characteristic produce zero migration yet.
The current sample correcting algorithm is: F (X)=KX+B; Wherein, F (X) is sample rate current, and K is the amplitude correction coefficient, and B is the zero correction coefficient.So, because the site environment factor has produced null offset, will directly influence the sampled result of electric current when current sensor.
The MCU of group crosstalk stream collecting unit constantly monitors the condition in online school zero in the present embodiment, comprising:
Condition one: as long as total remittance abroad electric current ∑ I=0, the output of all current transformers at this moment should be 0, so to covering the zero point of all current transformers, shown among Fig. 8 33,34;
Condition two: as long as the group crosstalk on a certain road is pressed less than total remittance abroad voltage, at this moment the current transformer on this road should be output as 0, otherwise has produced zero migration, should be covered the zero point of this road current transformer.
Existing header box intelligence monitoring and controlling device generally uses Hall current sensor as the acquisition means of group crosstalk stream, the Hall current sensor of photovoltaic header box special use generally adopts single power supply, export zero point about 2.5 volts, corresponding 2.5 ± 2 volts of positive and negative 20 peaces, 0.7% precision, 0.1% the linearity.Practical operating experiences learns such transducer because the restriction of factors such as self-characteristic causes environmental suitability poor, and is comparatively responsive to temperature, and the shakiness at zero point of current sensor causes sampling output that skew is arranged.
The utility model embodiment provides the method in the online school of a kind of current transformer zero, has solved existing header box supervising device and can't carry out the problem of fuse fault warning and location and the problem of current sensor zero migration.
More than novel photovoltaic header box intelligence monitoring and controlling device and corresponding method that the utility model embodiment is provided be described in detail, but the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof, should not be construed as restriction of the present utility model.Those skilled in the art are in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.
Claims (5)
1. a novel photovoltaic header box intelligence monitoring and controlling device is characterized in that, comprising:
Basic module, and the optional components that is connected with described basic module;
Described basic module comprises group crosstalk stream collecting unit;
Described optional components comprises that the group crosstalk presses collecting unit, network communication interface unit, wireless communication interface unit, external sensor interface unit, self powered supply module, remittance abroad electric current and voltage sampling unit, and in the input/output interface unit at least one.
2. device according to claim 1 is characterized in that:
Described optional components is connected with described group of crosstalk stream collecting unit by the plug and play mode.
3. device according to claim 1 is characterized in that, described group of crosstalk stream collecting unit comprises:
The Hall current sensor of Lian Jieing successively, low pass filtered involves commutation circuit, analog to digital converter ADC and microcontroller MCU, and the high pressure sample circuit that is connected with microcontroller MCU respectively, the total current sampling unit, the switching value input, switching value output, auxiliary communication interface, Ethernet interface, sensor interface, 485 communication interfaces, display button and wave point.
4. device according to claim 1 is characterized in that, described group of crosstalk presses collecting unit to comprise:
Sampled voltage input lightning protection circuit, second class protection and filter circuit, electronic switch commutation circuit, linear optical coupling buffer circuit, ADC sample circuit, microcontroller MCU, indicator light, communication port, and Power Management Unit.
5. device according to claim 1 is characterized in that, described external sensor interface unit comprises: the signal conditioning circuit of isolation, single-chip microcomputer and ADC change-over circuit, communication interface, and power management module.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632891A (en) * | 2013-11-27 | 2014-03-12 | 苏州电气集团有限公司 | Automatic electronic breaker batch networking accuracy calibrating method |
| CN104065337A (en) * | 2014-06-24 | 2014-09-24 | 苏州高创特新能源发展有限公司 | Gain-type intelligent photovoltaic confluence box |
| CN104167987A (en) * | 2014-08-13 | 2014-11-26 | 深圳市金宏威技术股份有限公司 | Photovoltaic combiner box measuring and control device based on sampling resistors |
| WO2016173161A1 (en) * | 2015-04-29 | 2016-11-03 | 京东方科技集团股份有限公司 | Photovoltaic combiner box monitoring system |
| CN104167987B (en) * | 2014-08-13 | 2017-01-04 | 深圳市金宏威技术股份有限公司 | Photovoltaic combiner box measure and control device based on sample resistance |
| CN112234868A (en) * | 2020-09-28 | 2021-01-15 | 天津孚瑞得斯科技有限公司 | Thermoelectric conversion control system and control method |
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2013
- 2013-03-07 CN CN 201320104333 patent/CN203135757U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632891A (en) * | 2013-11-27 | 2014-03-12 | 苏州电气集团有限公司 | Automatic electronic breaker batch networking accuracy calibrating method |
| CN103632891B (en) * | 2013-11-27 | 2016-05-04 | 苏州电气集团有限公司 | Network the in batches method of automatic calibration precision of electronic circuit breaker |
| CN104065337A (en) * | 2014-06-24 | 2014-09-24 | 苏州高创特新能源发展有限公司 | Gain-type intelligent photovoltaic confluence box |
| CN104167987A (en) * | 2014-08-13 | 2014-11-26 | 深圳市金宏威技术股份有限公司 | Photovoltaic combiner box measuring and control device based on sampling resistors |
| CN104167987B (en) * | 2014-08-13 | 2017-01-04 | 深圳市金宏威技术股份有限公司 | Photovoltaic combiner box measure and control device based on sample resistance |
| WO2016173161A1 (en) * | 2015-04-29 | 2016-11-03 | 京东方科技集团股份有限公司 | Photovoltaic combiner box monitoring system |
| US10193496B2 (en) | 2015-04-29 | 2019-01-29 | Boe Technology Group Co., Ltd. | Photovoltaic combiner box monitoring system |
| CN112234868A (en) * | 2020-09-28 | 2021-01-15 | 天津孚瑞得斯科技有限公司 | Thermoelectric conversion control system and control method |
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