On June 17, 2022, the world's first 35kV high-voltage direct coupled energy storage system developed by NR was successfully connected to the grid in Shaoxing Hongxu energy storage power station in China. It not only helps to achieve the efficient use of clean energy and promote the green and low-carbon transformation, but also enhances the flexible regulation capacity of the power grid.
High voltage direct coupled energy storage not only reduces the electrical distance from the main grid, but also has the advantages of stronger grid support effect, response consistency and higher conversion efficiency.
Energy storage batteries
The smooth operation of the project helps to explore and establish the standard of advance energy storage technology, promote the energy storage system to move towards a higher voltage level, larger capacity, safer, more reliable and more efficient direction, and can adapt to the characteristics of multiple types of energy storage batteries, making a useful attempt for the development direction of energy storage.
The whole system uses a cascade topology to distribute the batteries to each PCS module
The whole system uses a cascade topology to distribute the batteries to each PCS module. The reliability of the whole energy storage system is effectively improved through the integrated closed self-circulation air cooling technology and online thermal redundancy technology. At the same time, the multi-level active equalization technology is used to greatly improve the utilization of the battery and eliminate the "short board effect" of the battery cluster.
Green power systems
NR has provided a complete set of solutions for Shaoxing 35kV high voltage direct coupled energy storage system, including energy management system (EMS), Power Management System (PMS), high and low voltage full series air / liquid cooled Power conversion system (PCS), and battery management system (BMS).
NR will continue to do a good job in the exploration of new energy storage systems, promote the research and practice of grid-forming energy storage application, and make more contributions to the construction of green power systems.
