The power system is a unified whole composed of power generation, power supply (transmission, transformation and distribution), power consumption facilities, and secondary facilities such as regulation control, relay protection and safety automatic device, metering device, dispatching automation and power communication required to ensure its normal operation. [7]

The power system is a power production and consumption system composed of power plants, power transmission and distribution lines, power supply and distribution stations and power consumption. Its function is to convert the primary energy in nature into electric energy through the power generation device, and then supply the electric energy to all users through transmission, transformation and distribution. In order to realize this function, the power system also has corresponding information and control systems at various links and levels to measure, regulate, control, protect, communicate and dispatch the production process of electric energy, so as to ensure that users can obtain safe and high-quality electric energy.

The main structure of the power system includes power supply (hydropower station, thermal power plant, nuclear power station and other power plants), substation (step-up substation, load center substation, etc.), transmission and distribution lines and load center. The power supply points are also connected to each other to realize the exchange and regulation of electric energy between different regions, so as to improve the safety and economy of power supply. The network formed by transmission lines and substations is usually called power network. The information and control system of the power system is composed of various detection equipment, communication equipment, safety protection devices, automatic control devices, monitoring automation and dispatching automation systems. The structure of the power system shall ensure the reasonable coordination of power production and consumption on the basis of advanced technical equipment and high economic benefits.

The key technologies of intelligent power system can be divided into the following three levels:

The first level: system primary new technology and intelligent power generation and power consumption basic technology, including renewable energy power generation technology, ultra-high voltage technology, intelligent transmission and distribution equipment, large capacity energy storage, electric vehicles and intelligent power consumption technology and products.

The second level: secondary new technology of the system, including advanced sensing, measurement, communication technology, protection and automation technology.

The third level: power system dispatching, control and management technology, including advanced information collection and processing technology, advanced system control technology, and new system operation and management technology adapted to the power market and two-way interaction.

The highest form of intelligent power system development is the ability of multi-objective and self optimizing operation, which is also the long-term goal of intelligent power system.

Multi index refers to the index expression of safety, cleanness, economy, efficiency, compatibility, self-healing, interaction and other characteristics of intelligent power system.

Self optimization means that on the basis of reasonable planning and construction, relying on perfect and unified infrastructure and advanced sensing, information, control and other technologies, through comprehensive self-monitoring and information sharing, the accurate cognition of self state is realized, and the decision-making and comprehensive regulation are formed through intelligent analysis, so that the state of the power system automatically tends to multi-objective optimization