In recent years, the photovoltaic industry has developed rapidly. In order to study the operation performance of photovoltaic grid-connected power generation systems and optimize the design of photovoltaic power plants, the monitoring technology of photovoltaic grid-connected power generation systems has been developed in depth with the development of photovoltaic industry.
Large-scale solar power plants with new energy have been constructed and put into operation one after another. It is necessary to centrally monitor, store, analyze and display the operating conditions of photovoltaic power plants in order to master the operation management and operation experience of photovoltaic power plants. The design of future photovoltaic power plants provides sufficient scientific basis.
In the photovoltaic power generation system, the monitoring of the photovoltaic power generation system in the traditional sense is generally established under close-range conditions, that is, close-range monitoring. This monitoring method is mainly that maintenance personnel stay on site and know the operation of various power stations through liquid crystal display. Parameters (PV array voltage, input and output voltage, input and output current, output power, etc.) and environmental parameters (such as ambient temperature, solar radiation intensity, etc.), constantly check the values displayed by the monitoring equipment, and make corresponding adjustments when necessary Processing, using manual methods to control various states and parameters of the system, including modifying parameters and viewing parameters, this method requires that each maintenance point should be equipped with maintenance personnel and implement a shift system. However, with the successive completion and operation of photovoltaic power stations, the management system has also revealed its own shortcomings. Maintenance personnel are labor-intensive, management level is low, and the exchange of data and information between relevant departments of the system is complicated, which results in a large amount of data and information. Redundancy and inconsistency On the other hand, due to the characteristics of remote, scattered, and large-scale photovoltaic power plants, the data collection and display are too scattered, and there is a lack of a centralized platform for centralized observation and storage of data, which will lead to problems in analysis and control. inconvenience and difficulty.
It can be seen that data and information are very important in the application of photovoltaic grid-connected monitoring systems, so it is necessary to construct a unified photovoltaic grid-connected power generation monitoring system to achieve complete and unified real-time monitoring and operation management of the entire photovoltaic power station.
From the initial inspection of the photovoltaic power station to the later monitoring of the photovoltaic local area network, and then to the establishment of the photovoltaic network monitoring system that was promoted in 2007, the management of the photovoltaic power station has realized the real remote monitoring. Among them, the development of the photovoltaic network monitoring system mainly goes through three phases.
The photovoltaic network monitoring system in the first stage adopts the form of setting up a server on site. This method realizes Internet monitoring in a point-to-point manner. Users are required to remember the network address of each power station server and set up a user name and password. The disadvantage of this method is that the monitoring cost is high, and the management is more troublesome. The PV network monitoring system in the second stage adopts the C/S access mode forwarded by the network server. However, the disadvantages are also obvious. It takes a certain amount of time to view the data, and the client needs to be continuously upgraded to improve its functions. At the same time, the settings of the client will be cumbersome. There are also certain limitations in the way of data transmission.
The photovoltaic network monitoring system in the third stage has developed into a real monitoring and management platform form. Users can access completely through the B/S structure, providing more convenience to users who are accustomed to web access, and there is no longer any monitoring of power plants. Limits on quantity and form of collection. Fully realize the interconnection characteristics of the Internet.
The development of the photovoltaic network monitoring and management system not only solves the management problems of photovoltaic power plants, but also helps people to quickly improve their understanding of photovoltaic power generation and recognize the characteristics of photovoltaic power generation. At the same time, it is irreplaceable for photovoltaic product innovation and technological progress. effect.