"Story Store" Development Trend of United Electric Power Generation

New energy scheduling difficulties
Wind power and photovoltaic have intermittent and random characteristics. It is difficult for independent wind farms and photovoltaic power stations to provide continuous and stable energy output. Therefore, new energy generation such as wind power and photovoltaic power generation is difficult to predict, difficult to control, and difficult to dispatch. To risk.
Wind energy and solar energy resources have natural complementarity in time and area. During the day, solar energy is sufficient, wind energy is sufficient in the evening, solar energy is abundant in the summer, and wind energy is sufficient in winter, especially in the northwest and north China regions. If the wind and solar energy storage devices are combined on the basis of wind and light to form a combined wind and solar power generation system, the power output characteristics of the whole wind power generation system can be improved, and the friendliness of grid-connected power generation can be improved.

　　 Scenery storage industry chain
The wind-storage combined power generation system is mainly composed of a wind power generation unit, a photovoltaic power generation unit, an energy storage system, and an intelligent control dispatch system. Wind power and photovoltaic power generation methods complement each other in energy collection and have their own characteristics. Photovoltaic power generation has reliable power supply, low operation and maintenance costs but high cost; wind power generation has high power generation, low cost of construction and operation and maintenance, but low reliability. Wind and solar energy storage combined power generation system can make unstable energy into stable high-quality power products through the storage and release of wind power and photovoltaic power, and increase the degree of absorption of renewable energy by the power grid.

Scenery storage combined power generation system is an integration of a series of key technical devices with intelligent dispatch control system as the core, involving many industrial chains such as wind turbines, photovoltaic power stations, energy storage batteries and intelligent control dispatch systems. Specifically include:
1) Wind turbines with advanced performance, among them wind turbines with low voltage ride-through capability, are of key significance for improving grid-connected friendliness;
2) Photovoltaic power plants, including various tracking control systems, as well as polysilicon, photovoltaic inverters and other products and technologies;
3) Energy storage systems, including lithium-ion batteries, liquid flow, and sodium-sulfur batteries;
4) Intelligent control scheduling system, which implements monitoring and control of all subsystems and devices on the intelligent scheduling support platform, and implements intelligent control and dispatching according to grid dispatching instructions.

　 Technology Application and Outlook
China's major power grid companies and power generation groups are actively exploring the engineering application of wind and solar energy combined power generation systems. The most typical one is the national scenery storage and transmission demonstration project in Zhangbei County, Hebei Province, which is the focus of the national “Golden Sun” project. The project is also one of the first pilot projects of the State Grid Corporation of China Smart Grid, and will be connected to the grid for power generation at the end of the year. The demonstration project will provide a practical platform for large-scale power grids to accept new energy, improve the friendly and intelligent deployment of renewable energy, and at the same time enhance the core competitiveness of the renewable energy power generation industry and promote large-scale development, and promote the scenery resources. It is of great significance to develop and utilize the overall strategy for the sustainable development of national energy.