AC synchronous power grid is composed of AC transmission lines and substations to transmit AC energy. The generation and consumption of electricity in power system are AC, and the conversion of AC voltage is convenient, which is suitable for power transmission of different distances and capacities. Synchronous power grid is the basic law of power grid development, which has great advantages in technology and economy. The advantages of AC synchronous power grid are as follows.

(1) It has strong adaptability to the changes of power structure, load distribution and power flow. When all generators operate synchronously at the same frequency, it has the natural property of automatic recovery of synchronous operation after disturbance and fault. The larger the scale of power grid and the more generators connected, the stronger the ability to resist disturbance and fault impact, and the higher the reliability of power supply.

(2) With strong exchange capacity between networks, it can fully obtain networking benefits such as peak load shifting, peak load regulation, mutual aid of water and fire, cross basin compensation, mutual reserve and adjustment of surplus and shortage, etc. at the same time, the network loss is small, which is conducive to energy saving.

(3) Large AC synchronous power grid can create network conditions for the access of large thermal power, hydropower, nuclear power and wind power bases. All kinds of power sources and loads in the network form a strong natural connection, which can maximize the role of all kinds of power sources in each period of time, realize the optimal operation of the whole network more conveniently and economically, and optimize the allocation of resources in a wider range, resulting in the reduction of reserve and energy consumption Investment, accident support, improve reliability, reduce operating costs and other huge comprehensive benefits.

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