Editor's note: in recent years, the national Power Grid Corp is actively taking the initiative to adapt to the "Internet +" strategy, making full use of new technologies such as cloud and material transfer, and carrying out systematic work in key aspects such as wide interconnection, intelligent interaction, flexibility and flexibility, safety and control, openness and sharing.

It is understood that the construction of ubiquitous power Internet of things has made substantial progress in many cities, and many comprehensive demonstration projects have been implemented successively. The first stage of ubiquitous power Internet of things formulated by State Grid Corporation has entered the stage of overall speed-up.

In January 2019, State Grid Jiangsu Nanjing Power Supply Co., Ltd. and Nanjing soft core technology Co., Ltd. carried out in-depth cooperation, developed relevant plans, and studied and solved the power quality problems of the distribution network in the relevant station area. In the whole network, it is the first time to build a three-level coordinated power quality management application scenario based on the principle of self-discipline and cooperation by using the embedded app control mode of intelligent distribution and transformation terminal, which provides a new way for power quality management of distribution network.

At present, relevant demonstration projects have been successfully implemented in Jiangning District, Nanjing, Jiangsu Province.

For a long time, the low-voltage distribution network, as the terminal link connecting the grid and the users, has many problems, such as the difficulty in obtaining the real-time operation status of the line, the inability to form an effective data flow and so on.

In practical application, the power grid company will transform the power grid according to local conditions. On the one hand, it will reasonably configure the distribution transformer and reactive compensation device at the load end of the line, on the other hand, it will strengthen the real-time control of the reactive voltage equipment in the power grid, play the role of the reactive voltage equipment to the greatest extent, and improve the economic benefits of the whole power grid. However, there are still some deficiencies in reactive voltage control.

Related issues, such as:

Voltage and reactive power regulation mainly depends on local judgment, and the distribution and influence of global reactive power and voltage are not fully considered.

Most of the existing automatic control systems regulate voltage and reactive power in isolation, but they do not combine voltage and reactive power regulation organically

At present, the voltage and reactive power optimization control of power grid belongs to the global optimization of the system in short time scale, and the control decision-making does not have the initiative and predictability, and does not fully consider the influence of the uncertainty of reactive load on the reactive power and voltage control in long time scale.

The frequency of action is too frequent when the voltage and reactive power regulating equipment is controlled automatically, which seriously affects the stability of power supply and the service life of the equipment.

Most of the existing systems are unable to unify the functions of centralized control and decentralized control. The application function of distribution network is single and its practicability is not strong.