Application Of Industrial Switch In Monitoring System of Photovoltaic Power Station

Photovoltaic power generation system is a power generation system that converts solar energy into electric energy by using the principle of photovoltaic effect. Its main components are solar photovoltaic array, combiner box, DC cabinet, inverter and box transformer. Its characteristics are high reliability, long service life, non-polluting environment, independent power generation and grid-connected operation. It is a clean and pollution-free environmental protection energy, which is favored by enterprises and organizations in various countries and has broad development prospects.

With the construction and use of photovoltaic power stations in China, the domestic photovoltaic industry has developed rapidly. There are many kinds of monitoring equipment involved in photovoltaic power stations, and it is necessary to understand the operation of the power station in real time. Therefore, it is an urgent need to establish a complete monitoring system. The environment of the photovoltaic power station is very harsh, which requires the performance of the transmission equipment (Industrial Switch) of the monitoring system of the photovoltaic power station to be very strict.

The monitoring system of photovoltaic power station requires the industrial switch equipment to have low transmission delay and high reliable transmission guarantee; Support Vlan/QoS and other data processing functions to ensure priority transmission of monitoring and control data; Support ACL access control, and the network management system supports SNMP v1/v2c/v3; Adapt to harsh EMC/EMI environment; The ability to protect against dust, humidity, salt fog and vibration, and the ability to adapt to high temperature; Provide convenient network management function and diagnosis function, and assist operators in remote fault analysis and location of network system and business system, which are shown in the following aspects:

The demand of PV power station monitoring system for industrial switch

Self-healing redundancy protection function

How to establish a reliable and uninterrupted communication network has become a challenge we must face. In recent years, with the rapid development of industrial Ethernet, network redundancy technology has been widely used in power automation systems. The non-master architecture of ring network redundancy algorithm and its self-healing time are less than 20ms, which well ensure the reliability of the network.

Strong electromagnetic compatibility

Because some equipment of the photovoltaic power station will produce a strong electromagnetic field, this puts forward high requirements on the electromagnetic compatibility of the industrial switch equipment of the communication network. If the electromagnetic compatibility is not good, the data communication will be abnormal or even impossible.

Extreme temperature difference

The environment of photovoltaic power generation site is very bad, not only to be eroded by wind and rain, but also to be tortured by extreme temperatures. This requires that the corresponding industrial switch equipment must be able to work reliably in the temperature range of - 40 - 85 ° C.

Industrial switch has rich optical ports

Optical fiber is widely used in the photovoltaic power generation industry because it is basically free from electromagnetic interference, long transmission distance and high bandwidth. As one of the transmission equipment, the industrial switch needs to provide rich optical fiber ports.

Powerful scalability

Industrial switches need to have strong scalability to meet the expansion of the system. Therefore, the industrial switch needs to adopt modular design, so that users can flexibly choose the transmission medium, and it is conducive to the future upgrade and expansion.

The photovoltaic power station monitoring system solution of Houshi industrial switch adopts a layer 3 architecture, which is mainly composed of control center (core layer), access layer (data aggregation layer) and access terminal (field layer). The core layer industrial switch and the convergence layer industrial switch transmit data to the background through optical port cascade. The core layer industrial switch opens relevant management functions to reduce network failures, Improve the security and stability of network transmission.

This scheme uses private ring to achieve front-end equipment redundancy, and uses aggregation layer switch port aggregation to achieve link redundancy of upstream power station control layer. The core computer room is composed of a rack type industrial switch, which gathers multiple ring network data flows and transmits them to the communication management machine for protocol conversion and data analysis. Each outdoor room is composed of a number of Din-rail ring network switches. Each ring network improves the security of the network through physical isolation. The ring network switch enables the fast ring network redundancy protocol to ensure the rapid failover of the network. The VLAN virtual LAN function of the switch is enabled in the ring network to isolate the power SCADA, environmental detector, inverter DC distribution cabinet, combiner box and video and other services to prevent the broadcast storm from affecting other services, It also enables the broadcast storm suppression function of each service access port of the switch, which can realize the function of "effective data transmission and invalid data isolation" in the network, and improve the security of network data transmission. At the same time, it uses the Qos service quality function to allocate the bandwidth of the access port of the industrial switch according to different service levels.

We focus on providing users with reliable industrial Internet communication products and independent and controllable system solutions, and have rich experience in the photovoltaic industry. Our industrial switch series products support a wide temperature environment of - 40 ℃~85 ℃, and meet the stable operation under harsh environment. Our main products have passed CE certification, FCC certification and CCC certification, as well as the national grid inspection report and the telecommunication equipment access license, meeting the monitoring system requirements of photovoltaic power stations.