CN106597165A - Photovoltaic power station grid-connected remote test method and system based on Internet - Google Patents

Abstract

The invention discloses a method and system for remote testing of grid-connected photovoltaic power stations based on Internet+, including a grid-connected photovoltaic power station data collection device, a data cloud, an intelligent analysis platform, etc., wherein the grid-connected data collection device of a photovoltaic power station must have The data acquisition function required by the standard, the communication function of uploading test data to the data cloud, etc.; the data cloud mainly receives the original collected data uploaded by the grid-connected data acquisition device of the photovoltaic power station, and performs data classification management according to the database management mode; intelligent analysis platform It mainly downloads the original test data from the data cloud, conducts mathematical modeling for different test tests, and carries out functions such as data analysis, statistics, and output test reports.

Description

An Internet-based grid-connected remote test method and system for photovoltaic power plants

technical field

The invention belongs to the technical field of new energy grid-connected testing, and in particular relates to a remote testing method and system for grid-connected photovoltaic power plants based on Internet+.

Background technique

At present, as the proportion of photovoltaic power generation capacity in the power system increases, its impact on the power system is becoming more and more significant. Therefore, how to safely and reliably grid-connect operation of random and intermittent new energy power generation and how to solve various impacts on the power system after power generation is connected to the grid have become urgent problems to be solved. The large-scale grid-connection of photovoltaic power stations faces major technical problems such as power system peak regulation, safe operation of the power system, and power quality.

Therefore, it is very important to conduct a comprehensive test and evaluation of the impact of photovoltaic power station grid connection on the safe operation of the power system in the early stage. At present, the grid-connected test of photovoltaic power plants in China is limited to the traditional fixed test method, and the new energy grid-connected test is carried out through the time-consuming traditional working mode such as manual operations and calculations. This method will not only consume a lot of manpower, material resources, and financial resources, but also may affect the accuracy and reliability of the test results.

In the process of realizing the present invention, the inventors found that by establishing a remote test system for grid-connected photovoltaic power plants based on Internet + technology, the sharing of test data resources can be realized, and problems such as the impact of grid-connected photovoltaic power plants on the safe operation of the power system and power quality can be comprehensively improved. The test and research ability of the project, the cultivation and exercise of the ability of the talent team to use the Internet and intelligent technology, lay the foundation for the application of Internet + technology in the grid-connected supervision and management of photovoltaic power plants.

Contents of the invention

The purpose of the present invention is to address the above problems and propose a method and system for remote testing of grid-connected photovoltaic power plants based on Internet+, so as to improve the efficiency of grid-connected testing of photovoltaic power plants and improve the quality of data analysis for grid-connected photovoltaic power plants.

In order to achieve the above purpose, the technical solution adopted by the present invention is: a method and system for remote testing of grid-connected photovoltaic power plants based on Internet+, the main features of which include:

(1) Establish a grid-connected remote test system architecture for photovoltaic power plants, including photovoltaic power plant data acquisition devices, data clouds, and intelligent analysis platforms;

(2) Two-way information exchange is realized between the data acquisition device of the photovoltaic power station and the data cloud, and between the data cloud and the intelligent analysis platform;

(3) The photovoltaic power station data acquisition device realizes the on-site collection of photovoltaic power station grid-connected data, and can upload the original data to the data cloud.

(4) The data cloud has a decentralized storage function, which can store test data and test process files, etc.

(5) The intelligent analysis platform can realize the normalization of data format, and can perform functions such as statistical analysis of data and automatic generation of data reports.

The present invention relates to a method and system for grid-connected remote testing of photovoltaic power plants based on Internet+, since it includes: building a grid-connected remote test system architecture for photovoltaic power plants including photovoltaic power plant data acquisition devices, data clouds, and intelligent analysis platforms; The above-mentioned system architecture, design of information channels, specific control methods, etc., forms a remote test system for photovoltaic power station grid connection; the data acquisition device of photovoltaic power station performs real-time measurement of parameters such as voltage, current, and power during the photovoltaic power station grid connection test; according to relevant When the regulations need to adjust the active power of the photovoltaic power station, it can be carried out through manual intervention and automatic adjustment by the data acquisition device of the photovoltaic power station; after the parameter measurement is completed, the measured local data will be uploaded to the data cloud according to the set time interval requirements; The data cloud receives the raw data of the measurement through a variety of communication methods; the intelligent analysis platform downloads the raw data from the data cloud platform, processes the data according to the specified data format, and then follows the requirements of relevant standards and the established data model Analyze and count the data, and automatically form a data analysis report.

The present invention has the advantages of reliable data quality and unified analysis standards during the entire test process, reducing the need for long-term staff to wait for power changes, greatly improving the efficiency of testing and the quality of test reports; The level of data management and analysis ensures the safety and stability of grid-connected photovoltaic power plants. It is of great significance to the safe and stable operation of photovoltaic power plants after they are connected to the grid.

Description of drawings

Fig. 1 Schematic diagram of grid-connected remote test system for photovoltaic power plants.

Figure 2 The remote grid-connected power quality test process of photovoltaic power plants.

Fig. 3 Test flow of remote grid-connected active power output characteristics of photovoltaic power plants.

detailed description

Embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

According to an embodiment of the present invention, a method and system for remote testing of grid-connected photovoltaic power plants based on Internet+ are provided. Embodiment 1 takes the remote grid-connected power quality test process of a photovoltaic power station as an example; embodiment 2 takes the remote grid-connected active power output characteristic test process of a photovoltaic power station as an example.

Example 1

Step 1: When the photovoltaic power station is out of service, the data acquisition device of the photovoltaic power station automatically measures the voltage total harmonic distortion rate, frequency deviation, voltage deviation, and three-phase voltage unbalance of the grid-connected point for 24 hours.

Step 2: Under the normal operating conditions of the photovoltaic power station, the output power of the photovoltaic power station is from 0 to 100% of the rated power, with 10% of the rated power as the interval, through the automatic control of the data acquisition device of the photovoltaic power station, or the manual intervention of the photovoltaic power station .

Step 3: The photovoltaic power station data acquisition device automatically collects data, and it is required to collect at least two 10-min time series instantaneous current measurement values and instantaneous voltage measurement values at each grid-connected point of the photovoltaic power station in each power range and phase.

Step 4: Under the full-load operating condition of the photovoltaic power station, the data acquisition device of the photovoltaic power station automatically collects data, collects three-phase current and three-phase voltage at the grid-connected point of the photovoltaic power station, the sampling frequency is 50kHz, and the test period is 48 hours.

Step 5: After the data collection of the photovoltaic power station is completed, the data is stored in the local storage unit according to the established naming rules, and the data is uploaded to the data cloud at the same time.

Step 6: The data cloud receives the original data uploaded by the data acquisition device of the photovoltaic power station, and stores the data on the data cloud server according to the established storage rules.

Step 7: The intelligent data analysis platform downloads the original data from the data cloud, processes and analyzes the data according to the requirements of the power quality test standard, and automatically generates a test report.

Example 2

Step 1: Measure various parameters of the test point through the meteorological parameter test device, and transmit the data to the data acquisition device of the photovoltaic power station;

Step 2: Under the normal operating conditions of the system, the data acquisition device of the photovoltaic power station automatically measures various parameters of the grid-connected point with the data acquisition device, and continuously measures for at least one full day (with one irradiation cycle).

Step 3: After the data collection of the photovoltaic power station is completed, the data is stored in the local storage unit according to the established naming rules, and the data is uploaded to the data cloud at the same time.

Step 4: The data cloud receives the original data uploaded by the data acquisition device of the photovoltaic power station, and stores the data on the data cloud server according to the established storage rules.

Step 5: The intelligent data analysis platform downloads the original data from the data cloud, performs data processing and analysis on the data according to the requirements of the photovoltaic power station active power output test standard, fits the active power output curve, and automatically outputs reports and fitting curves.

To sum up, the two embodiments of the present invention provide a method and system for remote testing of grid-connected photovoltaic power plants based on Internet+, which relate to the technical field of new energy grid-connected testing, including: data acquisition devices for photovoltaic power plants, data clouds, smart The photovoltaic power station grid-connected remote test system including the analysis platform, the photovoltaic power station data acquisition device performs data acquisition and necessary automatic control functions during the on-site photovoltaic power station grid-connected test process, and the data cloud is responsible for receiving the data uploaded by the photovoltaic power station data acquisition device Raw data, the intelligent data analysis platform conducts data analysis and statistics according to different types of test procedures for the data on the data cloud platform, and finally automatically generates test reports. Through standardized test procedures and data analysis methods, the test efficiency is greatly improved, saving It is of great significance for the safe and stable operation of photovoltaic power plants after they are connected to the grid.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions described in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. a kind of photovoltaic electric station grid connection remote test system based on the Internet, it is characterised in that photovoltaic electric station grid connection is remotely surveyed Test system framework includes, photovoltaic plant data acquisition unit, data cloud, intelligent analysis platform；Wherein, photovoltaic plant data are adopted Acquisition means carry out the parameter measurements such as voltage, electric current, power work in photovoltaic electric station grid connection test process, in real time；Parameter measurement After end, regularly the local data of measurement is uploaded in data cloud；Data cloud receives the initial data of measurement；Intellectuality point Analysis platform downloads initial data from data cloud platform, data is processed according to the data form of regulation, according to set number Data are analyzed according to model and are counted, and form data analysis report.

2. a kind of photovoltaic electric station grid connection remote test system based on the Internet according to right 1, it is characterised in that data Cloud carry out photovoltaic electric station grid connection detect initial data storage work, while with intelligent analysis platform data transmitted in both directions number According to.

3. a kind of photovoltaic electric station grid connection remote test system method of testing based on the Internet according to right 1, its feature It is,

Step 1：Under photovoltaic plant stoppage in transit operating mode, photovoltaic plant data acquisition unit automatic measurement measures the grid entry point of 24 hours Voltage total harmonic distortion factor, frequency departure, voltage deviation, non-equilibrium among three phase voltages.

Step 2：Under photovoltaic plant accidental conditions, automatically controlled by photovoltaic plant data acquisition unit, or by photovoltaic electric Stand the mode of manual intervention, from 0 to the 100% of rated power, the rated power with 10% is as interval for photovoltaic plant output.

Step 3：Photovoltaic plant data acquisition unit carries out data acquisition automatically, it is desirable at least receive in each power interval, per phase Collection 2 10min time serieses instantaneous current measurements of photovoltaic plant grid entry point and instantaneous voltage measured value.

Step 4：Under photovoltaic plant oepration at full load operating mode, photovoltaic plant data acquisition unit carries out data acquisition automatically, in light Overhead utility grid entry point collection three-phase current, three-phase voltage, sample frequency is 50kHz, 48 hours test periods.

Step 5：Photovoltaic plant data acquisition unit is saved the data in after the completion of data acquisition according to set naming rule In local storage unit, while data are uploaded to into data cloud.

Step 6：Data cloud receives the initial data of photovoltaic plant data acquisition unit upload, will according to set storage rule Data are stored on data Cloud Server.

Step 7：Intelligent data analysis platform, from data cloud initial data is downloaded, will according to electric energy quality test standard to data Asking carries out data processing and analysis, automatically generates test report.

4. a kind of photovoltaic electric station grid connection remote test system method of testing based on the Internet according to right 1, its feature It is,

Step 1：Test point parameters are measured by meteorologic parameter test device, and transfers data to photovoltaic plant data and adopted Acquisition means；

Step 2：Under the mode operating mode that system is normally run, photovoltaic plant data acquisition unit carries out data acquisition unit automatically The parameters of measurement grid entry point, continuous measurement at least one day enough.

Step 3：Photovoltaic plant data acquisition unit is saved the data in after the completion of data acquisition according to set naming rule In local storage unit, while data are uploaded to into data cloud.

Step 4：Data cloud receives the initial data of photovoltaic plant data acquisition unit upload, will according to set storage rule Data are stored on data Cloud Server.

Step 5：Intelligent data analysis platform, from data cloud initial data is downloaded, defeated according to photovoltaic plant active power to data Go out testing standard to require to carry out data processing and analysis, be fitted active power curve of output, and automatically output report and fitting are bent Line.