CN112751419A - Photovoltaic multi-parameter monitoring system and method thereof - Google Patents
Photovoltaic multi-parameter monitoring system and method thereof Download PDFInfo
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- 238000007781 pre-processing Methods 0.000 claims abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 17
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- 238000003860 storage Methods 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000004870 electrical engineering Methods 0.000 abstract description 2
- 238000010248 power generation Methods 0.000 description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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- Engineering & Computer Science (AREA)
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- Human Computer Interaction (AREA)
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Abstract
The application discloses a photovoltaic multi-parameter monitoring system and a method thereof, which relate to the technical field of electrical engineering and automation, and comprise a photovoltaic array and a photovoltaic module temperature sensor connected with the photovoltaic array; the photovoltaic module temperature sensor is connected with a data acquisition card, and the data acquisition card is connected with a signal conditioner and a sensor mechanism; the signal conditioner is used for converting the analog signals acquired by the sensor into digital signals and carrying out data preprocessing; the sensor mechanism is used for collecting peripheral environmental parameters and electric parameter data of the photovoltaic array; the signal conditioner is connected with an industrial personal computer, and the industrial personal computer is used for carrying out network communication with the sensor mechanism. The method and the device have the advantages that real-time data such as the ambient environment, the output power, the active power and the reactive power of the photovoltaic power station are dynamically detected, so that a complete, accurate and reliable data source is provided for photovoltaic grid connection, and the purpose of stable and efficient operation of a photovoltaic grid connection system is further guaranteed.
Description
Technical Field
The application relates to the technical field of electrical engineering and automation, in particular to a photovoltaic multi-parameter monitoring system and a method thereof.
Background
With the continuous development of the photovoltaic industry and the increasing maturity of the photovoltaic grid-connected technology, the photovoltaic grid-connected power generation monitoring work is gradually developed. Because the photovoltaic power station has the characteristic of large occupied area, the traditional data acquisition is scattered too much, and no centralized platform is used for monitoring and storing photovoltaic data, so that inconvenience is brought to photovoltaic grid-connected control.
Chinese patent No. CN207382259U discloses a photovoltaic power generation monitoring system, the system comprises a box body, a plurality of generating capacity statistical devices, a plurality of display screens, a data statistical module, a data comparison module and a wireless data transmission module, the generating capacity statistical devices are fixed in the box body, the display screens are embedded on the front surface of the box body, each generating capacity statistical device is correspondingly connected with one photovoltaic generating device, each display screen is correspondingly connected with one generating capacity statistical device, a plurality of groups of indicator lights are arranged on the front surface of the box body, the indicator lights are arranged side by side with the display screen, the generating capacity statistical devices are all in communication connection with the data statistical module, the data statistical module is in signal communication with the data comparison module, the indicator light is in communication connection with the data comparison module, and the data statistics module is in communication connection with the wireless terminal through the wireless data transmission module.
However, the photovoltaic power generation monitoring system is difficult to apply to a high-capacity photovoltaic power generation system and to meet the requirements of flexibility and expansibility, so that the monitoring effectiveness of the high-capacity photovoltaic power generation system is influenced and needs to be improved.
Disclosure of Invention
In view of the above, a first objective of the present application is to provide a photovoltaic multi-parameter monitoring system, so as to achieve the purposes of being convenient for flexible modification and providing a complete, accurate and reliable data source. The specific scheme is as follows:
a photovoltaic multi-parameter monitoring system comprises a photovoltaic array and a photovoltaic module temperature sensor connected with the photovoltaic array; the photovoltaic module temperature sensor is connected with a data acquisition card, and the data acquisition card is connected with a signal conditioner and a sensor mechanism;
wherein:
the signal conditioner is used for converting the analog signals acquired by the sensor into digital signals and carrying out data preprocessing;
the sensor mechanism is used for acquiring peripheral environmental parameters and electric parameter data of the photovoltaic array;
the signal conditioner is connected with an industrial personal computer, and the industrial personal computer is used for carrying out network communication with the sensor mechanism.
Preferably: the photovoltaic array and the data acquisition card are both connected with a power grid, and the power grid is used for providing electric energy for the data acquisition card and providing electric energy for the photovoltaic array or receiving photovoltaic electric energy.
Preferably: the photovoltaic array is connected with collection flow box, dc-to-ac converter and transformer in proper order, the transformer with the electric wire netting is connected.
Preferably: the sensor mechanism comprises a distributed measurement system and a plurality of sensors which are connected with the distributed measurement system; and the industrial personal computer is connected with the distributed measurement system and is used for detecting the inverter and the power quality parameters.
Preferably: the sensor comprises a photovoltaic module temperature sensor, an illumination intensity sensor, an environment temperature sensor, a wind speed sensor, a direct current voltage sensor, an alternating current sensor and an alternating voltage sensor.
Preferably: the industrial personal computer is built based on a PXI measuring system, and the data acquisition card is of a PXI bus structure.
A second objective of the present application is to provide a photovoltaic multi-parameter monitoring method, which includes the following steps:
step 1, a sensor mechanism collects original signals, converts the signals into electric signals and inputs the electric signals into a data acquisition card;
step 2, converting the electric signals into digital signals by a data acquisition card and inputting the digital signals into the industrial personal computer;
step 3, a LabVIEW platform in the industrial personal computer analyzes, calculates, stores and manages the digital signals, and displays the digital signals on a human-computer interaction interface;
and 4, monitoring the data and the diagrams which are displayed by the human-computer interaction interface and analyzed and calculated so as to dynamically monitor the operating state parameters of the photovoltaic power station.
Preferably: in step 1, a data acquisition card measures the voltage and current at the input and output ends of the inverter and at the common connection point.
According to the scheme, the photovoltaic multi-parameter monitoring system and the method thereof have the following beneficial effects that:
1. real-time data such as the surrounding environment, output power, active power, reactive power and the like of a photovoltaic power station are dynamically detected through a photovoltaic array, a sensor, a signal conditioner, a data acquisition card and an industrial personal computer, so that a complete, accurate and reliable data source is provided for photovoltaic grid connection, and the purpose of ensuring stable and efficient operation of a photovoltaic grid connection system is further achieved;
2. the device is built based on the PXI measurement system, network communication is carried out between the device and the distributed measurement system, the device has strong computing capacity, and detection of an inverter and electric energy quality parameters can be completed;
3. analog signals acquired by the sensor are converted into digital signals through the signal conditioner so as to carry out data preprocessing, and the purpose of remarkably improving the completeness, accuracy and reliability of a data source is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a block diagram of a photovoltaic multi-parameter monitoring system disclosed in the present application;
fig. 2 is a block flow diagram of a photovoltaic multi-parameter monitoring system disclosed herein.
Description of reference numerals: 1. a photovoltaic module temperature sensor; 2. a photovoltaic array; 3. an illumination intensity sensor; 4. an ambient temperature sensor; 5. a wind speed sensor; 6. a direct current sensor; 7. a direct current voltage sensor; 8. a combiner box; 9. an inverter; 10. a transformer; 11. a signal conditioner; 12. a distributed measurement system; 13. a data acquisition card; 14. an industrial personal computer; 15. an alternating current sensor; 16. an alternating voltage sensor; 17. and (4) a power grid.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
As shown in fig. 1, a photovoltaic multi-parameter monitoring system includes a photovoltaic array 2 and a photovoltaic module temperature sensor 1 connected to the photovoltaic array 2. The photovoltaic array 2 generates photovoltaic electric energy, and the photovoltaic module temperature sensor 1 is used for effectively detecting the temperature of the photovoltaic module. Meanwhile, the photovoltaic module temperature sensor 1 is connected with a data acquisition card 13, and the data acquisition card 13 is connected with a signal conditioner 11 and a sensor mechanism; the signal conditioner 11 is connected with an industrial personal computer 14, and the industrial personal computer 14 is used for carrying out network communication with the sensor mechanism.
Wherein: the signal conditioner 11 is used for converting the analog signal acquired by the sensor into a digital signal and performing data preprocessing; the sensor mechanism is used for collecting the peripheral environmental parameters and the electrical parameter data of the photovoltaic array 2. Therefore, the analog signals acquired by the sensor are converted into digital signals through the signal conditioner 11 to perform data preprocessing, and the purpose of remarkably improving the integrity, accuracy and reliability of the data source is achieved.
As shown in FIG. 1, the photovoltaic array 2 and the data acquisition card 13 are both connected with a power grid 17. The grid 17 is used for supplying electrical energy to the data acquisition card 13 and for supplying electrical energy to the photovoltaic array 2 or receiving photovoltaic electrical energy generated by the photovoltaic array 2. In order to realize the electric energy recovery and utilization of the photovoltaic array 2, the photovoltaic array 2 is sequentially connected with a combiner box 8, an inverter 9 and a transformer 10, and a power grid 17 is connected with the transformer 10 and then forms a stable circuit connection structure with the photovoltaic array 2.
It should be noted that the sensor mechanism includes the distributed measurement system 12 and a plurality of sensors each connected to the distributed measurement system 12. The industrial personal computer 14 is connected with the distributed measurement system 12 and is used for detecting the inverter 9 and the power quality parameters. The sensors comprise a photovoltaic module temperature sensor 1, an illumination intensity sensor 3, an environment temperature sensor 4, an air speed sensor 5, a direct current sensor 6, a direct current voltage sensor 7, an alternating current sensor 15 and an alternating current voltage sensor 16, and dynamic detection is carried out on real-time data such as the surrounding environment, output power, active power, reactive power and the like of the photovoltaic power station through a photovoltaic array 2, a plurality of sensors, a signal conditioner 11, a data acquisition card 13 and an industrial personal computer 14, so that a complete, accurate and reliable data source is provided for photovoltaic grid connection, and the purpose of stable and efficient operation of a photovoltaic grid connection system is further guaranteed.
It should be mentioned that the industrial personal computer 14 is built based on a PXI measurement system, and the data acquisition card 13 is of a PXI bus structure. Therefore, the PXI-based measurement system is built and is in network communication with the distributed measurement system 12, so that the calculation capacity is high, and the detection of the inverter 9 and the power quality parameters can be completed.
As shown in fig. 1 and 2, a photovoltaic multi-parameter monitoring method includes the following steps:
step 1, a sensor mechanism collects original signals, converts the signals into electric signals and inputs the electric signals into a data acquisition card 13, and the data acquisition card 13 measures the voltage and the current of the input end, the output end and a common connection point of an inverter 9;
step 2, the data acquisition card 13 converts the electric signal into a digital signal and inputs the digital signal into the industrial personal computer 14;
step 3, a LabVIEW platform in the industrial personal computer 14 analyzes, calculates, stores and manages the digital signals and displays the digital signals on a human-computer interaction interface;
and 4, monitoring the data and the diagrams which are displayed by the human-computer interaction interface and analyzed and calculated so as to dynamically monitor the operating state parameters of the photovoltaic power station.
In conclusion, the system has the effect of dynamically detecting real-time data such as the surrounding environment, the output power, the active power, the reactive power and the like of the photovoltaic power station through the photovoltaic array 2, the sensor, the signal conditioner 11, the data acquisition card 13 and the industrial personal computer 14, so that a complete, accurate and reliable data source is provided for the photovoltaic grid connection, and the purpose of ensuring the stable and efficient operation of the photovoltaic grid connection system is further achieved; and then under the cooperation of building based on PXI measurement system, carry out network communication with distributed measurement system 12, have powerful calculating power, can also accomplish the detection of dc-to-ac converter 9 and electric energy quality parameter simultaneously for this photovoltaic multi-parameter monitoring system has the effect of being convenient for change in a flexible way and providing complete, accurate and reliable data source.
References in this application to "first," "second," "third," "fourth," etc., if any, are intended to distinguish between similar elements and not necessarily to describe a particular order or sequence. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, or apparatus.
It should be noted that the descriptions in this application referring to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (8)
1. A photovoltaic multi-parameter monitoring system is characterized in that: the device comprises a photovoltaic array (2) and a photovoltaic module temperature sensor (1) connected with the photovoltaic array (2); the photovoltaic module temperature sensor (1) is connected with a data acquisition card (13), and the data acquisition card (13) is connected with a signal conditioner (11) and a sensor mechanism;
wherein:
the signal conditioner (11) is used for converting analog signals acquired by the sensor into digital signals and carrying out data preprocessing;
the sensor mechanism is used for acquiring peripheral environment parameters and electric parameter data of the photovoltaic array (2);
the signal conditioner (11) is connected with an industrial personal computer (14), and the industrial personal computer (14) is used for carrying out network communication with the sensor mechanism.
2. The photovoltaic multiparameter monitoring system according to claim 1, characterized in that: the photovoltaic array (2) and the data acquisition card (13) are connected with a power grid (17), and the power grid (17) is used for providing electric energy for the data acquisition card (13) and connecting the photovoltaic array (2) for providing electric energy or receiving photovoltaic electric energy.
3. The photovoltaic multiparameter monitoring system according to claim 2, characterized in that: the photovoltaic array (2) is connected with combiner box (8), inverter (9) and transformer (10) in proper order, transformer (10) with electric wire netting (17) are connected.
4. A photovoltaic multiparameter monitoring system according to claim 3, characterized in that: the sensor mechanism comprises a distributed measurement system (12) and a plurality of sensors which are connected with the distributed measurement system (12); the industrial personal computer (14) is connected with the distributed measurement system (12) and is used for detecting the inverter (9) and the power quality parameters.
5. The photovoltaic multiparameter monitoring system according to claim 4, wherein: the sensor comprises a photovoltaic module temperature sensor (1), an illumination intensity sensor (3), an environment temperature sensor (4), a wind speed sensor (5), a direct current sensor (6), a direct voltage sensor (7), an alternating current sensor (15) and an alternating voltage sensor (16).
6. The photovoltaic multiparameter monitoring system according to claim 1, characterized in that: the industrial personal computer (14) is built based on a PXI measuring system, and the data acquisition card (13) is of a PXI bus structure.
7. A photovoltaic multi-parameter monitoring method is characterized by comprising the following steps:
step 1, a sensor mechanism collects original signals, converts the signals into electric signals and inputs the electric signals into a data acquisition card (13);
step 2, converting the electric signals into digital signals by the data acquisition card (13) and inputting the digital signals into the industrial personal computer (14);
step 3, a LabVIEW platform in an industrial personal computer (14) performs analysis, calculation, storage and management on the digital signals, and displays the digital signals on a human-computer interaction interface;
and 4, monitoring the data and the diagrams which are displayed by the human-computer interaction interface and analyzed and calculated so as to dynamically monitor the operating state parameters of the photovoltaic power station.
8. The photovoltaic multiparameter monitoring method according to claim 7, characterized in that: in step 1, a data acquisition card (13) measures the voltage and current at the input and output ends of the inverter (9) and at the common connection point.
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| CN202011641814.5A CN112751419A (en) | 2020-12-31 | 2020-12-31 | Photovoltaic multi-parameter monitoring system and method thereof |
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| CN103166240A (en) * | 2011-12-15 | 2013-06-19 | 中国科学院电工研究所 | Grid-connected solar photovoltaic power station monitoring system |
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2020
- 2020-12-31 CN CN202011641814.5A patent/CN112751419A/en active Pending
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| CN103166240A (en) * | 2011-12-15 | 2013-06-19 | 中国科学院电工研究所 | Grid-connected solar photovoltaic power station monitoring system |
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Address after: No.217 Taizhou Road, gongchenqiao, Hangzhou, Zhejiang, 310015 Applicant after: Zhejiang Huadian Equipment Testing Research Institute Co.,Ltd. Address before: 311100 building 7, 138 Yunlian Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: ZHEJIANG HUADIAN EQUIPMENT TESTING INSTITUTE Co.,Ltd. |
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Application publication date: 20210504 |