I. Intelligent Points of Intelligent Substations
Intelligent substations mainly consist of an equipment layer and a system layer. Their biggest differences from traditional substations lie in three aspects: intelligent primary equipment, condition-based equipment maintenance, and networked secondary equipment. From the outset, intelligent substations establish an integrated intelligent system encompassing measurement, analysis, and control. So, in what ways are these intelligent substations truly intelligent?
1. Improve voltage quality and suppress harmonics and oscillations.
With the continuous increase in load and the expansion of the power grid structure, the power grid will bear more power electronic devices, and the voltage harmonic pollution and oscillation problems caused by capacitive loads in the system have become increasingly prominent. Smart substations should have the ability to ensure the system voltage level and suppress voltage harmonics and oscillations.
2. Highly integrated control platform, intelligent automatic control
The construction of intelligent substations relies on the development of computer technology. With the increasing intelligence of substations, a highly integrated control platform will become an indispensable part of intelligent substations. Resources from systems such as EMS, SCADA, FIS, and DTS should be integrated, and an online operating system should be implemented using embedded technology. A unified information platform for comprehensive substation data should be established, providing standardized and regulated access to data from various subsystems and enabling standardized interaction with other systems such as dispatching systems.
Intelligent automatic control will be the core component of the intelligent functions of a smart substation. It should be able to refer to predictions and compare various control schemes such as pre-optimization and optimal control based on the results of digital measurement systems to meet the requirements of substation intensive management and sequential control. It should be able to predict and prevent possible accidents based on the results of current system status identification. It should be able to establish an automatically operating V-network whose reliability increases as user electricity consumption increases.
II. What are the prospects for the development of intelligent substations?
Through the above introduction, you should now have a basic understanding of the two main intelligent features of smart substations. In this section, we will mainly discuss the development prospects of smart substations.
As the future direction of power grid development, smart grids permeate all aspects of power generation, transmission, transformation, distribution, consumption, dispatching, and communication. Among these aspects, smart substations are undoubtedly the most crucial link.
The construction of smart grids is a power grid development approach adopted based on the characteristics of my country's energy distribution and load consumption patterns, adapting to the country's current and future social development. It is highly adaptable to the input and output of various energy sources, especially large-scale wind and solar power, enabling large-scale and efficient allocation of energy resources. The construction of smart grids in my country has risen to the level of a national strategy. Smart substations are one of the core platforms for energy conversion and control in the construction of a robust smart grid, and their prospects remain broad.
Photovoltaic power generation is characterized by randomness, intermittency, and volatility, which limits its grid-connected capacity and restricts its large-scale application. The development of smart grids has spurred increased participation from all sectors of society in utilizing photovoltaic power generation, thereby enhancing its development and efficiency.
my country has been continuously exploring smart grids. Currently, the domestic power grid cannot meet the development needs of the photovoltaic power generation industry. Therefore, my country will build a "strong smart grid" with "ultra-high voltage as the core" to solve the grid connection problem of photovoltaic power generation and promote the utilization of new energy sources.
my country's smart grid is based on a robust power grid with ultra-high-voltage (UHV) power grids as its backbone and coordinated development of power grids at all levels. It utilizes advanced communication, information, and control technologies to construct a unified, robust, and intelligent power grid characterized by informatization, automation, digitalization, and interactivity.
Countries around the world are investing heavily in research on smart grids and new energy power generation such as solar power, because the development of new energy power generation relies on the development of smart grids. The high-speed, reliable, economical, and secure power transmission channels of smart grids provide a good guarantee for the power transmission of photovoltaic power generation, and their development and application are complementary and mutually reinforcing.
