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Classification and Application of Photovoltaic Power Generation System
- May 29, 2018 -

Smart photovoltaic power station is based on photovoltaic power conversion and power transmission network, and it is a new type of power station that is highly integrated with modern advanced digital information technology, communication technology, internet technology, cloud computing technology, big data mining technology and photovoltaic technology. It aims to fully meet the customer's demand for high power generation, low initial investment, low operation and maintenance costs, high reliability, and security of photovoltaic power plants. It achieves high-yield, operational, manageable, and reliable performance over a 25-year life cycle. Evolution.

The distinctive features of smart photovoltaic power plants are intelligence, efficiency, safety and reliability. Follow-up we will make a series of reports around these points. This article first elaborates on intelligence.

How do we understand the concept of intelligence in smart photovoltaic power plants? What are the specific aspects of it? In short: It is the digitalization of the power station. Based on the digitization, it realizes intelligent collection of component information, intelligent transmission of high-speed information, and intelligent analysis of massive information, so as to truly realize intelligent management, intelligent monitoring, and intelligent operation and maintenance of photovoltaic power plants. .

One. Full digital power station

Smart photovoltaic power station is a fully digital power station that can truly achieve "credible, visible, manageable and controllable." Its key equipment intelligent inverter can realize high-accuracy collection of current and voltage information of each string (detection accuracy of 0.5% or more), and these large and accurate data are transmitted to the photovoltaic power plant control center for further To achieve "trusted" and "visual"; due to the increase of transmission bandwidth and reduction of transmission delay (up to ms level), the power plant's control speed is greatly improved and "controllable" is achieved; through a comprehensive power plant management system And big data analysis engine to realize the "controllable" of the power station. The digitalization of PV power plants lays the foundation for future business and business model innovations. For example, through the mobile Internet, users can subscribe for panels or strings at specific locations and receive revenue in real time through mobile app.

Secondly, the intelligent photovoltaic power station adopts an innovative networking scheme to break the existing design constraints, and revisit components, cables, inverters, boosting, monitoring, and data from the perspectives of simplified construction, best system performance matching, and simplified maintenance. The system components such as the collection unit are combined and optimized; the types of components are reduced, more standardized, and more conducive to automated production; through factory pre-installation and connector installation, the on-site construction cost is reduced, and construction quality is improved. And create "upgradable, scalable, scalable" photovoltaic power plant. When component technology advances and the operating environment changes, the software that utilizes the smart inverter can be upgraded remotely online, backward compatible with design features, and does not need to replace the online operating equipment. The algorithm can be upgraded to enjoy the latest technological achievements and maximize reuse. Existing equipment.

Thirdly, smart photovoltaic power plants have adaptive technologies for active power grids. They take advantage of the high-speed processing capabilities, high sampling and control frequencies, and control algorithms of smart inverters to actively adapt to changes in the power grid and achieve better parallel control of multiple machines. The harmonic quality of the grid connection, better meet the grid access requirements, and improve the adaptability in the harsh grid environment.

II. Intelligent Operation Management

Intelligent photovoltaic power plants can monitor, operate, manage, and warn from multiple dimensions of time, space, and equipment, analyze, judge, evaluate, and integrate power plant operation problems, and achieve quick and easy operation and maintenance, and provide operational personnel and maintenance personnel. , management personnel, etc. provide comprehensive, convenient and differentiated data and services.

For example, the introduction of big data analysis engine and expert operation and maintenance system, based on the collection of massive information, custom reports, expert analysis systems, slicing analysis, mining system potential, discover potential problems, constitute empirical data. Find potential defects in a timely manner and tap revenue to improve space. Through real-time data collection, cloud storage, and on-line expert analysis systems, combined with the geographical environment and the climate characteristics of the photovoltaic power plant, and the power plant scale to use the data information collected by the power plant to predict power generation, the power station can automatically perform health checkups and give maximum revenue-based benefits. Maintenance suggestions, such as cleaning suggestions, parts replacement and maintenance suggestions, etc., to achieve preventive maintenance; accumulate long-term operational data, comprehensive analysis of environmental factors such as natural environment, radiation, etc., through the online adjustment of intelligent control unit algorithm or software upgrade, make the power station In different environments, the system components run in the best matching state to maximize the benefits.

The application of drones is a feature of smart operation and maintenance. UAV intelligent inspection can support mobile inspection. On-site problems can be combined with historical data of the equipment for diagnostic analysis. Components such as hot spots, cracks, and mismatches can be discovered in time. Video data can be sent back to the expert center in real time to achieve information sharing. Remote diagnosis, truly early prevention, early detection, early resolution, to avoid power loss and failure.

The mobile operation and maintenance centered on photovoltaic terminals is also a bright spot. The mobile operation and maintenance mode can be seamlessly connected with the production management system, simplifying a large number of manual reports and manual processing in the traditional operation and maintenance mode. At the same time, the front-rear side cooperation and the open space cooperative operation and maintenance, and the rear experts grasp the real-time remote diagnosis through video. The situation on the site, guiding the frontline staff to handle faults and problems.

At the same time, the use of photovoltaic intelligent terminals to facilitate the entry of assets of power generation equipment, support asset inquiries and analysis based on historical asset data; according to the operation of the assets and maintenance data, support equipment evaluation for different batches or different manufacturers; Unified management of sub-equipment and other equipment is presented in a visualized manner such as topological maps and layers; supporting the operation and maintenance of the mobile terminal, viewing the operation status and important data of the power station; combining equipment data, operation data, operation and maintenance data of the power station, Historical data and power generation forecasts support financial assessments of power plants and provide reference for power plant transactions.

The key to smart PV power plants is the introduction of digital information technology. Through the integration of big data mining and analysis, cloud computing, and communications technologies with photovoltaic technologies, intelligent management, intelligent operation and maintenance, and intelligent monitoring are finally realized. Photovoltaic power plants are also truly Into the "intelligent" age! As the State Department counselor and the chairman of the China Renewable Energy Society, Mr. Shi Dingyi said, "Bringing digital information technology into the renewable energy industry has realized the integration of two industries from specific products. It will greatly promote the rapid development of smart power plants, smart grids and even smart energy, and will make an important contribution to China from a large renewable energy source to a renewable energy powerhouse."