The grid-connected photovoltaic power station is composed of solar photovoltaic panels, inverters and power transmission and transformation equipment. Photovoltaic power generation monitoring and management system needs to measure, save, analyze and control a large number of parameters. Through data acquisition, monitoring and analysis, it mobilizes terminal hardware equipment, optimizes configuration, works together, and effectively integrates power generation assets and equipment.

  The photovoltaic power station inverter, combiner box, irradiator, meteorological instrument, ammeter and other equipment connected to the data transmission terminal through RS232/RS485 are uploaded to the network server or the local computer of the management center through 2G/3G/4G, and the operation and maintenance personnel can view the relevant data and management on the computer.Data display is too scattered, there is no centralized platform to observe and store data, from small building photovoltaic, Golden Sun project to large desert power stations and various forms of photovoltaic power stations, resulting in inconvenience and difficulties in analysis and control. The daily operation data of the power station has important data reference value for the management of the power station system, the maintenance and analysis of the equipment.

  Under the condition of meeting the security constraints such as power system stability, the expected requirements of "unattended and few people on duty" of photovoltaic power station are realized, such as data acquisition, wireless transmission, fast network networking, etc. Carry out remote centralized monitoring, scientific dispatching management, remote maintenance, full network information exchange, and statistical analysis of the operation of the photovoltaic power station for the data requirements of the photovoltaic power station.Effective data integration analysis and historical data report management are the basic decision-making basis for the work and plan of the power station. It is an intelligent operation and maintenance solution to achieve the goal of improving the management level of the power station, to achieve "events and faults", to achieve efficient monitoring, and to meet the needs of grid access, rational deployment, centralized monitoring, grid analysis, network automation and daily maintenance.

  Application of Cellular modem in Wireless Photovoltaic Monitoring System?

  The Cellular modem is used for realizing the parameter acquisition of each monitoring node, for example, a photovoltaic module voltage and current sampling module is responsible for sampling the voltage and current values of the photovoltaic module and judging whether the photovoltaic module fails, and sensors such as a temperature sensor, a humidity sensor, an illumination sensor and the like are responsible for sampling environmental data, Provide data support for system optimization and PV module adjustment.

  Photovoltaic power station Cellular modem operation and maintenance remote network monitoring, to achieve multi-level monitoring, photovoltaic power station monitoring, remote control, remote diagnosis, data upload. The industrial standard RS485 interface, MODBUS protocol and equipment customization protocol are used to collect the power generation, output power and inverter power of the photovoltaic power station. Monitor the ambient temperature, wind speed, light intensity and other parameters.Monitor the status of inverters, temperature sensors, power quality measuring instruments and other equipment, and support various inverters, smart meters, temperature, light, wind speed and other equipment. Monitor inverter parameters: PN/SN/PVC input voltage, PVC input current, AC output voltage, current, frequency, power, inverter temperature, power generation of the day, power generation of the year, total power generation, emission reduction, coal reduction, etc.Monitor environmental sensor parameters: light, ambient temperature, wind speed, wind direction and other sensors. Monitor smart meter parameters: total power, total reactive power, total active power generation, total reactive power generation, line voltage, phase voltage, current, frequency, active power, reactive power, power factor, harmonic voltage, harmonic current, etc. Based on Modbus, the data transmission terminal is enough to meet the data acquisition needs of a large number of devices.Network protocols, such as TCP protocol, IEC104 protocol, transmit data to the Ethernet management platform.