In modern society, energy storage technology is an important means to solve the problem of intermittent renewable energy. Among them, high-voltage direct-hanging energy storage technology, as a new battery energy storage method of MW level, is gradually receiving attention. The core idea is to connect the energy storage converter (PCS) directly to the high-voltage (3 kV and above) power grid, eliminating the transformer link required for traditional energy storage devices.
The core of this technology is a kind of energy storage device called "H-Cell". The device can convert the DC of multiple batteries into AC through single-phase PCS, and then output high voltage in series to match the voltage of power grid. On the basis of improving the power quality, the method emphasizes on reducing the influence of harmonics on the power grid to ensure the safe and stable operation of the power grid.
Classification of large-scale energy storage systems
In terms of economy, the high-voltage direct-mounted energy storage system eliminates transformers, filters and other equipment, which increases the comprehensive efficiency of the system by about 2%. For large energy storage systems, the key is to be able to significantly reduce its operating costs and improve its operational efficiency. Taking the energy storage system with 6000 cycles and 2 MWh/2 MWh as an example, even a small improvement in overall efficiency can bring more than hundreds of MWh of power consumption.
In terms of economy, the high-voltage direct-mounted energy storage system eliminates transformers, filters and other equipment, which increases the comprehensive efficiency of the system by about 2%. For large energy storage systems, the key is to be able to significantly reduce its operating costs and improve its operational efficiency. Taking the energy storage system with 6000 cycles and 2 MWh/2 MWh as an example, even a small improvement in overall efficiency can bring more than hundreds of MWh of power consumption.
A 100 MW level direct-mounted energy storage device with a highly reliable hierarchical control strategy. The system not only has the world's highest direct voltage (35 kV), but also the world's largest DC suspended energy storage device (100 MW). The method can quickly respond to the dispatching command within 5 ms, and can complete 0-100% reactive power compensation in the range of 50 ms to 100 ms, showing excellent operation performance and efficiency.
High voltage direct hanging energy storage technology has great development potential in the field of new energy because of its novel structure and flexible working mechanism. With the maturity of the technology, the application of the technology will be more and more, it will become an important support for the optimization of our energy structure and green development.
