I. scheme description
Shr5000 photovoltaic booster station integrated automation system can monitor and control the battery array, combiner box, inverter, box transformer and other equipment in the photovoltaic power station in real time, realize the equipment data collection, analysis, processing, event recording and storage, and present the operation of the power station through various types of charts, trends and reports, so as to ensure the remote monitoring needs of customers for the data of the power station. Its friendly user interface, comprehensive data service, powerful analysis function and perfect fault alarm ensure the safe, reliable and stable operation of solar photovoltaic power generation system.

II. Scheme features
Function overall optimization design
The system provides perfect relay protection, measurement, local monitoring and telecontrol functions, and systematically optimizes the functions of voltage and reactive power control (VQC), five prevention, small current grounding line selection, equipment operation and management.
The system includes the active / reactive power control system of photovoltaic power station. Based on the unified monitoring platform, the micro dynamic meteorological mode is established for each inverter by using the aerodynamic mode analysis, and the AGC active power regulation ability of the inverter is given scientifically.
The system provides photovoltaic power prediction system, which can accurately predict the future 168 hour load time curve of the solar grid connected power station, and the average prediction accuracy of the system is more than 85%.
The system integrates the five defense functions and can be seamlessly connected with the five defense systems of other mainstream manufacturers.

Powerful and flexible means of communication
the network of station control layer and bay layer supports 100M Ethernet structure to realize high-speed and bottleneck free data transmission;
Adopt IEC61850 or IEC60870-5-103 standard transmission protocol to ensure the openness of the system;
The communication protocol is rich in variety and can be extended according to the engineering requirements;
The communication network structure has high reliability and strong expansibility, which can meet the requirements of various network structures, such as dual network redundancy, fiber star topology and fiber ring network.

Open background software system
The background system adopts a flexible architecture of hierarchical design, modular packaging and application configuration on demand. The application program and database can be flexibly configured on each computer node.
The background system supports mixed deployment and can be composed of computers with different operating systems installed. The system function can be expanded conveniently according to the user's needs, and meet the user's requirements for flexibility and scalability to the greatest extent.
Integrated design of real-time database and commercial database. It supports a variety of commercial databases and has the capabilities of dual computers, dual networks and dual databases, providing high reliability guarantee for historical data storage and access;
fully support IEC61850 standard, establish complete primary and secondary models of plant and station through advanced integrated modeling of diagram and module and visualization.
Safe and reliable relay protection and measurement and control device
the communication protocol and information model of the protection and measurement and control device conform to IEC 61850 or 103 standards; it is compatible with intelligent and conventional primary equipment; it supports iec61588, IRIG-B or second pulse timing, and the timing accuracy can reach 1 μ s;
The modular design is adopted for the device, and special configuration tools can be used to configure various protection functions according to different requirements, so the function adjustment is convenient.

III. typical system configuration

Note: for 110kV and below voltage level substation, the network can be simplified according to the needs, and the equipment is not divided into small rooms.
      Photovoltaic array can be networked in ring and star mode
      Station control layer equipment includes monitoring host, five prevention workstation, AGC \ AVC control host, telecontrol manager, GPS clock synchronization equipment; bay layer equipment includes protection measurement and control device of each bay or equipment, standby automatic switching device, bus protection device, low-voltage Bay protection measurement and control device, anti Island device, etc.
      A set of master clock is set in the station, with GPS and Beidou satellite as the standard clock source. SNTP network timing mode is adopted for station control layer equipment, and IRIG-B code timing is adopted for Bay layer equipment.
      According to the requirements of voltage level and equipment interval configuration, different application configurations can be made according to single set configuration and double set configuration.
      AGC \ AVC system is deployed in safety zone I of the electric field and adopts double network structure. The system communicates with the monitoring system of booster station, reactive power compensation device and other equipment to obtain real-time operation information. The data communication can adopt network mode or serial port mode. The real-time data is transmitted to the master station system through the power dispatching data network, and the active / reactive power control instructions are received from the master station, and then transmitted to the inverter and reactive power compensation device for remote adjustment and control.

      The optical power prediction system is deployed in safety zone II. The weather server analyzes and processes the received numerical weather forecast data, and then transmits them to the forecast server through the reverse isolation device. At the same time, the power prediction server collects the real-time data of photovoltaic power station monitoring system and photovoltaic weather station through the security hardware firewall, analyzes and models the local topography and climate characteristics over the years, obtains the ultra short-term power prediction of the photovoltaic power station in the next 4 hours and the short-term power prediction of the next 72 hours, and transmits it to the power prediction system at the dispatching side through the dispatching data network.