A brief introduction to intelligent station control and configuration technology
In intelligent station control, intelligent dispatching is a significant manifestation of the intelligence of the distribution system, and intelligent substation and intelligent distribution and dispatching technology play a very important role in this intelligent distribution network. Among them, the intelligent substation is the smallest component unit and the most important part of the smart distribution network.
Therefore, the intelligent substation is the starting point of the intelligent distribution network. Then this intelligent substation technology is developed with the standard of IEC 6 1 8 5 0, advanced sensor application technology and network communication technology widely used in substations.
Intelligent station control and dispatching technology is a modern power system control and dispatching technology based on artificial intelligence and automation technology. It realizes real-time monitoring, analysis and control of the power system by using intelligent algorithms, data mining, machine learning and other technical means, and improves the reliability, stability and efficiency of the power system.
Smart station architecture and its functional characteristics.
The intelligent substation is divided into a station control layer and an equipment layer, and high-speed network communication is used between levels. That is, the use of intelligent equipment, with the whole station information digitization, communication platform networking, information sharing standardization as the basic requirements, automatically complete the basic functions, and can support the power grid real-time automatic control, intelligent adjustment, analysis and decision-making, collaborative interaction and other advanced functions of the substation as needed.
Station control floor. The station control layer summarizes the real-time data of the whole station, transmits the information to the power grid dispatching center, and accepts and executes the dispatching order at the equipment layer. The station control layer protection is integrated, based on the real-time information collected by the substation, the fault is determined in a centralized or branch collaborative way, and the action decision is automatically adjusted to realize the relay protection function. It mainly completes the functions of data collection, monitoring, control, alarm, timing and other functions of the substation, as well as the data interaction with the spacer equipment.
The equipment layer is equivalent to the set of the process layer and the interval layer of i e c 6 1 8 5 0, including the equipment divided into interval units in the plant station. It is the lowest level of the substation automation system, responsible for the monitoring, control and protection of primary equipment in the substation. It is connected to the primary equipment through a cable or optical cable to achieve data acquisition, control, protection and other functions. The equipment layer equipment generally includes measurement and control devices, protection devices, fault recording devices, AC and DC power supplies, etc. The station control layer and the equipment layer are an important part of the substation automation system, and the communication and coordination between them are the key to ensure the normal operation of the substation automation system.
The basic feature of the technical application of the intelligent substation is the use of digital transformers in the current and voltage collection links to realize the digital application of electrical quantity collection. Realize the intelligence of primary equipment and improve the reliability, maintainability and adaptability of equipment.
Hierarchical distribution management: The intelligent substation divides the substation system into two layers: the station control layer and the interval layer. Among them, the hierarchical distributed system realizes the hierarchical partition management of objects according to the interval between plants and stations.
The modeling standard is unified and the intelligent substation is formulated according to the IEC 61 8 5 0 standard.
1. Standardize information and information exchange models to achieve data interoperability and on-site information sharing.
System function integrationIntelligent substation will carry out reasonable functional integration of traditional scattered secondary equipment, which is conducive to simplifying the structure of the secondary system and improving the reliability and availability of the system. Digital transformers and intelligent combination appliances can provide centralized collection, unified transmission, and sharing of different functions of data and information.
The information network sharing communication network is a functional carrier to realize the real-time information exchange between various components in the substation and other systems, meet the standardization of the communication interfaces in the station, realize data sharing and resource sharing, and achieve reliability, openness, real-time, security and synchronization. Realize the information exchange between the equipment of each layer inside the intelligent substation and between the external system.
Intelligent station relay protection integration.
The integration of relay protection of intelligent station refers to the real-time measurement of the electrical quantity and operating status parameters of each component in the intelligent substation and the integration and sharing of information in the entire substation through the optical fiber network. Therefore, the centralized management of all protection and measurement and control in the entire substation is realized in one host.
The integrated protection configuration of the intelligent station is mainly composed of three parts of hardware: the merging unit, the intelligent execution unit and the integrated protection unit.
Merge units. The merging unit is responsible for converting the current and voltage of the primary equipment into digital quantity, and the main function is to synchronously collect the voltage and current information of the digital transformer and convert it into digital signals. and send it to the Intelligent Execution Unit and the Integrated Protection Unit.
Intelligent control unit. The main function is to control the primary equipment, and collect the relevant switching information and send it to the integrated protection unit. Calculations and judgments are made based on the protection algorithm, control commands are generated, and they are sent to the primary device.
Integrated protection unit. The main function is an integrated integrated automation platform, which completes the classification and storage of sampling value information, is responsible for receiving the digital quantity sent by the merging unit, and calculates and judges according to the protection algorithm, wherein the protection program retrieves the sampled value data in the database for calculation, and returns the intelligent execution unit. Implement protection functions and send them to intelligent actuation units and monitoring systems. The advantage of the integrated protection configuration of the intelligent substation is that it can achieve a high degree of integration and automation of the protection function, reduce the number of protection equipment and connecting lines, and improve the reliability and maintainability of the protection system. At the same time, the integrated protection configuration of the intelligent substation can also realize the flexible configuration and expansion of protection functions to meet the needs of different application scenarios.