CN110971189A - Online monitoring system for electrical performance of multichannel photovoltaic module - Google Patents
Online monitoring system for electrical performance of multichannel photovoltaic module Download PDFInfo
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- CN110971189A CN110971189A CN201911187278.3A CN201911187278A CN110971189A CN 110971189 A CN110971189 A CN 110971189A CN 201911187278 A CN201911187278 A CN 201911187278A CN 110971189 A CN110971189 A CN 110971189A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 129
- 238000004891 communication Methods 0.000 claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 238000012423 maintenance Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000007405 data analysis Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims 2
- 239000000284 extract Substances 0.000 claims 1
- 238000010248 power generation Methods 0.000 abstract description 2
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- 238000005516 engineering process Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention provides an on-line monitoring system for electrical performance of a multi-channel photovoltaic module, which at least comprises three sub-loop systems: the power supply loop system is provided by an internal direct-current wide-voltage power supply system, and the input of a plurality of photovoltaic modules meets the requirement of energy supply for monitoring the operation of the loop system; the monitoring loop system at least comprises a monitoring element for acquiring electrical data of the photovoltaic modules in real time and an internal control system for analyzing the acquired electrical data; the communication loop system comprises an internal communication loop of the monitoring loop system and internal and external communication of an external communication loop monitoring loop system. The system monitors the voltage, the current, the power and the temperature of the photovoltaic module in real time, and provides reliable data support for the operation and maintenance of a power station; the overall power consumption is low, the power generation of a photovoltaic power station is not influenced, and the real-time state of the component is truly reflected; the long-time digital on-line monitoring is realized, the effectiveness and the correctness of all parameters are ensured, and the detection error is small.
Description
Technical Field
The invention relates to a monitoring system, in particular to a digital online monitoring system for electrical performance of a photovoltaic assembly (crystalline silicon).
Background
Photovoltaic modules (commonly referred to as solar panels) are generally formed by combining solar cells or solar cells of different specifications cut by a laser machine, and solar radiation energy is directly or indirectly converted into electric energy through a photoelectric effect or a photochemical effect by absorbing sunlight. The photovoltaic module is widely applied, and becomes essential procedure to the electric performance monitoring of photovoltaic module. The existing method for monitoring the electrical performance of the photovoltaic module on site in the photovoltaic power station lacks an efficient monitoring means, and the method is mainly based on group monitoring at present. However, in the actual operation process, due to the lack of monitoring based on the component level, the performance defect and the system defect of the photovoltaic power station, which cannot accurately position the components, are influenced.
Accordingly, based on the above-mentioned technology, those skilled in the art have endeavored to provide a system that can monitor the electrical performance of each component on-line in real time to solve the aforementioned problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing an on-line monitoring system for electrical performance of a multi-channel photovoltaic module, which can detect electrical parameters such as voltage, current and the like of a plurality of photovoltaic modules in real time and monitor electrical data in real time, thereby improving fault prediction and performance test of the photovoltaic modules and solving the problems in the background technology.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
the invention provides an on-line monitoring system for electrical performance of a multi-channel photovoltaic module, which at least comprises three sub-loop systems:
the power supply loop system is provided by an internal direct-current wide-voltage power supply system, and the input of the photovoltaic modules meets the requirement of energy supply for monitoring the operation of the loop system;
the monitoring loop system at least comprises a monitoring element for acquiring electrical data of the photovoltaic modules in real time and an internal control system for analyzing the acquired electrical data;
the communication loop system comprises an internal communication loop and an external communication loop of the monitoring loop system, wherein the internal communication loop realizes data transmission communication among all components of the monitoring loop system, and the external communication loop realizes communication between data acquired in the internal communication of the monitoring loop system and external equipment.
Furthermore, the internal direct-current wide-voltage power supply system supplies power to the monitoring loop system, the power supply voltage range is 40-300VDC, equipment power consumption is stably provided within the voltage range, and the overall influence of overall application efficiency on the assembly is improved.
Furthermore, the power supply introduced into the internal direct current wide voltage power supply system provides input energy through a plurality of photovoltaic modules, namely the tested modules, wherein the number of the photovoltaic modules is 3-4.
Further, monitoring elements of the monitoring loop system at least comprise voltage data monitoring, current data monitoring and temperature data monitoring.
Furthermore, the voltage data monitoring is multi-power voltage detection in a series circuit, each circuit of voltage is provided with a monitoring point position, monitoring elements are arranged on the monitoring point positions, the voltage range of each circuit of voltage to be measured is required to be 0-75 VDC, the measurement precision reaches 0.5%, and the voltage of each component is monitored in real time.
Furthermore, the current data monitoring is series current monitoring, and in combination with the current characteristic of the photovoltaic module, the current monitoring can be realized only by installing a monitoring element at one monitoring point.
Furthermore, the temperature data monitoring at least comprises an internal temperature monitoring element and an external temperature monitoring element, wherein the external temperature monitoring element is used for monitoring the temperature of the back plate of the photovoltaic module, the internal temperature monitoring element is used for reflecting the working temperature of equipment in the monitoring system in real time, the monitoring deviation caused by the working temperature of the equipment is corrected, and a basis is provided for the operation of the photovoltaic module and the stability of data.
Furthermore, the internal communication loop is connected with each element for monitoring voltage, current and temperature, and real-time sampling data of each monitoring position of the photovoltaic module is extracted in real time.
Furthermore, the internal communication loop is connected with the internal control system, the acquired electrical data are transmitted to the internal control system, the extracted data are fitted into real data through the convolution algorithm through the internal control system, the correctness and the effectiveness of the data are improved, and the data update rate is required to reach more than 50 Hz.
Furthermore, the internal control system is an internal control chip, and the monomer power and the total power of the components are calculated according to the data transmitted by the internal communication loop.
Furthermore, the external communication loop is connected with external equipment, and transmits the acquired current data, voltage data, temperature data and power data calculated by the internal control system to the external equipment, so that effective and reliable real-time data are provided for subsequent data analysis and power station operation and maintenance, and the operation state and performance of each module are truly reflected.
Furthermore, the overall power consumption of the monitoring loop system is less than or equal to 3W, and the corresponding loss on each component is 0.75W.
By implementing the on-line monitoring system for the electrical performance of the multi-channel photovoltaic module, provided by the invention, the following technical effects are achieved: the system is simultaneously provided with a plurality of paths of series voltage monitoring, current monitoring and temperature monitoring, monitors the voltage, the current, the power and the temperature of the photovoltaic module in real time, and provides reliable data support for the operation and the maintenance of a power station; the system is low in overall power consumption, power generation of a photovoltaic power station is not affected, and the real-time state of the component is truly reflected; the long-time digital on-line monitoring is realized, the effectiveness and the correctness of all parameters are ensured, and the detection error is small.
Drawings
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
FIG. 1 is a schematic diagram of a photovoltaic module monitoring system according to this embodiment;
FIG. 2 is a schematic diagram of a primary monitoring circuit of the photovoltaic module according to this embodiment;
fig. 3 is a schematic diagram of a secondary monitoring circuit of the photovoltaic module in this embodiment.
In FIG. 2, PV 1-PV 4 are input ports of four photovoltaic modules; v + and V-are the overall supply voltage; PV _ V1-PV _ V4 are voltage measuring units of four assemblies; PV _ I is a current measuring unit;
in fig. 3, the implementation connection line represents a dc primary circuit, and the dashed connection line represents a data acquisition circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solution of the present invention will be described in detail with specific embodiments.
The on-line monitoring system for electrical performance of the multi-channel photovoltaic module shown in fig. 1-3 at least comprises three sub-loop systems:
a power supply loop system, as shown in fig. 1, which is a direct current wide voltage power supply system, and provides a part of input voltage (voltage range 40-300VDC) of a plurality of photovoltaic modules (tested modules) to be collected by the internal current wide voltage power supply system to be converted into working electric energy of a monitoring module, so as to meet the energy supply of the operation of the monitoring loop system; as shown in the figure, the number of the photovoltaic modules introduced into the internal direct-current wide-voltage power supply system is four, four photovoltaic modules are the default (recommended) installation mode in actual operation, and the installation mode of three photovoltaic modules can be selected according to the arrangement condition of the field modules.
The internal direct-current wide-voltage power supply system supplies power for the monitoring loop system, the power supply voltage range is 40-300VDC, equipment power consumption is stably provided within the voltage range, and the overall influence of the overall application efficiency on the assembly is improved.
The monitoring loop system at least comprises elements for acquiring voltage data monitoring, current data monitoring and temperature data monitoring of a plurality of photovoltaic modules in real time, and an internal controller for analyzing the acquired electrical data.
The voltage data monitoring is multi-power voltage detection in a series circuit, as shown in the figure, four groups of photovoltaic modules comprise four voltage detections, each voltage is provided with a monitoring point (as shown in fig. 2, PV _ V1, PV _ V2, PV _ V3 and PV _ V4), monitoring elements are installed on the monitoring points, each voltage range is required to be 0-75 VDC, the measurement accuracy reaches 0.5%, and the voltage of each module is monitored in real time.
The current data monitoring is series current monitoring, the photovoltaic module current setting is combined, current monitoring can be achieved only by installing a monitoring element (such as PV _ I in the figure 2) on one monitoring point, namely the current data monitoring is one-way current detection, the current measuring range is required to be 0-20 ADC, the measuring precision is 0.5%, and the current change of the string is monitored in real time.
The temperature data monitoring at least comprises an internal temperature monitoring element and an external temperature monitoring element, wherein the external temperature monitoring element is used for monitoring the temperature of a back plate of the photovoltaic module, and the internal temperature monitoring element is used for reflecting the working temperature inside the photovoltaic module in real time and providing a basis for the operation of the photovoltaic module and the stability of data; as shown in the figure, the temperature monitoring comprises three paths of monitoring, namely two paths of external temperature monitoring and one path of internal temperature monitoring, wherein the two paths of external temperature monitoring use a PT 1000/semiconductor temperature measuring device, and the detection precision is +/-0.1 ℃.
The communication loop system comprises an internal communication loop and an external communication loop of the monitoring loop system, wherein the internal communication loop is connected with each element for monitoring voltage, current and temperature, and real-time sampling data of each monitoring position of the photovoltaic module is extracted in real time; the internal communication loop is connected with the internal controller, the acquired electrical data are transmitted to the internal control system, the extracted data are fitted into real data through a convolution algorithm through the internal control system, the correctness and the effectiveness of the data are improved, and the data updating rate is required to reach more than 50 Hz.
The internal controller may actually be an internal control chip, and calculates the individual power of the four components and the total power of the components according to data transmitted by the internal communication loop.
The overall power consumption of the monitoring loop system is less than or equal to 3W, the corresponding loss on each component is 0.75W, and the loss can be almost ignored for the existing photovoltaic components and the future photovoltaic components.
As shown in fig. 3, the external communication loop is provided with a data acquisition device, and the data acquisition device is communicated with the equipment antenna to communicate data acquired in the internal communication of the monitoring system with external equipment; the external communication loop transmits the acquired one-path current data, four-path voltage data, three-path temperature data, four-component single power and total power data calculated by the internal controller to external equipment through the data acquisition device and the equipment antenna, so that effective and reliable real-time data are provided for subsequent data analysis and power station operation and maintenance, and the running state and performance of each component are truly reflected.
As shown in fig. 3, the current stage monitoring system is connected to the previous stage monitoring system to form a dc primary circuit.
As shown in fig. 3, the dc voltage generated by the pv module monitored by the monitoring loop system is converted into a commercial frequency Alternating Current (AC) by the pv inverter and fed back to the commercial power transmission system or used by the off-grid power grid.
It should be added that, unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this invention belongs. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any uses or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the present invention is not limited to the structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. The utility model provides an on-line monitoring system of multichannel photovoltaic module electrical property which characterized in that includes three sub-circuit systems at least:
the power supply loop system is provided by an internal direct-current wide-voltage power supply system, and the input of the photovoltaic modules meets the requirement of energy supply for monitoring the operation of the loop system;
the monitoring loop system at least comprises a monitoring element for acquiring electrical data of the photovoltaic modules in real time and an internal control system for analyzing the acquired electrical data;
the communication loop system comprises an internal communication loop and an external communication loop of the monitoring loop system, wherein the internal communication loop realizes data transmission communication among all components of the monitoring loop system, and the external communication loop realizes communication between data acquired in the internal communication of the monitoring loop system and external equipment.
2. The on-line detection system of claim 1, wherein the internal dc wide voltage power supply system supplies power to the monitoring loop system, and the supply voltage range is 40 to 300VDC, and within the voltage range, the power consumption of the monitoring system is stably supplied, and the improvement of the overall application efficiency has less influence on the overall assembly.
3. The on-line detection system as claimed in claim 1, wherein the power supply introduced into the internal dc wide voltage power supply system is to provide input energy through a plurality of photovoltaic modules, i.e. the modules under test, wherein the photovoltaic modules are 3-4.
4. The on-line detection system of claim 1, wherein the monitoring elements of the monitoring loop system comprise at least a plurality of voltage data monitoring, current data monitoring, and temperature data monitoring.
5. The on-line detection system as claimed in claim 4, wherein the voltage data monitoring is multi-power voltage detection in a series circuit, each circuit voltage is provided with a monitoring point, monitoring elements are arranged on the monitoring points, each circuit voltage is required to be measured in a range of 0-75 VDC, the measurement accuracy reaches 0.5%, and the voltage of each component is monitored in real time.
6. The on-line detection system of claim 4, wherein the current data monitoring is series current monitoring, and in combination with the current characteristics of the photovoltaic module, the current monitoring can be realized by installing a monitoring element at one monitoring point.
7. The on-line detection system of claim 4, wherein the temperature data monitoring at least comprises an internal temperature monitoring element and an external temperature monitoring element, wherein the external temperature monitoring element is used for monitoring the temperature of the back plate of the photovoltaic module, and the internal temperature monitoring element is used for reflecting the working temperature of the equipment of the monitoring system in real time, correcting the monitoring deviation caused by the working temperature of the equipment and providing a basis for the operation of the photovoltaic module and the stability of data.
8. The on-line detection system of claim 4, wherein the internal communication loop is connected to each component for voltage, current and temperature monitoring, and extracts real-time sampling data of each monitoring position of the photovoltaic module in real time; the internal communication loop is connected with the internal control system, the acquired electrical data are transmitted to the internal control system, the extracted data are fitted into real data through the convolution algorithm through the internal control system, the correctness and the effectiveness of the data are improved, and the data update rate is required to reach more than 50 Hz.
9. The on-line testing system of claim 1, wherein said internal control system is an internal control chip, and calculates the unit power and total power of the components according to the data transmitted by said internal communication loop.
10. The on-line detection system of claim 9, wherein the external communication loop is connected to an external device, and transmits the acquired current data, voltage data, temperature data and power data calculated by the internal control system to the external device, so as to provide effective and reliable real-time data for subsequent data analysis and power station operation and maintenance, and truly reflect the operation state and performance of each module; the overall power consumption of the monitoring loop system is less than or equal to 3W, and the corresponding loss on each component is 0.75W.
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| CN208820743U (en) * | 2018-09-05 | 2019-05-03 | 晶澳太阳能有限公司 | The system of cell piece temperature after a kind of test photovoltaic component encapsulating |
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2019
- 2019-11-28 CN CN201911187278.3A patent/CN110971189A/en active Pending
Patent Citations (7)
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| CN101075752A (en) * | 2006-05-19 | 2007-11-21 | 上海航天卫星应用有限公司 | Satellite controlling system of photovoltaic power station |
| CN103633936A (en) * | 2013-11-30 | 2014-03-12 | 国家电网公司 | Photovoltaic header box automatic test system |
| CN104038150A (en) * | 2014-06-27 | 2014-09-10 | 国家电网公司 | Modularized and centralized type photovoltaic power generation interface unit |
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