With the increasing popularity of intermittent renewable energy sources, large-scale power storage has become a focus of attention.Pumped storage technologies have matured. Other megawatt-scale technologies are under development. These technologies can provide dispatchable capacity on demand.
As a complement to intermittent renewable energy sources, energy storage must be able to meet demand for multiple days, not just a few hours.At the household level, behind the meter, battery storage is being promoted to complement solar PV installations. It reduces demand on the grid, especially during evening peaks in electricity consumption.
Electricity energy storage is a technology that utilizes various energy storage devices or facilities to store electrical energy in the grid. It can effectively balance grid supply and demand and improve grid stability.
The main roles of power storage are:
1. Peak and valley load regulation. Charging energy storage in the trough of electricity consumption, discharging in the peak of electricity consumption, smoothing the power load curve, improve the efficiency of the power grid.
2. Frequency regulation. Fast charging and discharging to regulate the frequency of the power grid, to maintain the stable operation of the power grid.
3. Alternative backup. Provide backup power when the power grid fails to enhance the reliability of power supply.
4. Capacity backup. To meet the power demand of short-term load growth of the grid.
5. New energy grid connection. Storing and regulating the intermittent power fluctuation of new energy generation.
6. Power quality improvement. Provide reactive power compensation, voltage regulation and other functions.
