Grid-based and grid-based energy storage are two different energy storage control technologies.
Let's get to know the different converters first. "Grid-following" inverters track the voltage and phase of the grid to control its output. These "grid-following" inverters rely on the fact that the voltage and frequency of the grid are stabilized by an inertial source (i.e. rotating mass). The battery energy storage of "grid-following" inverters cannot cope with grid disturbances. In the event of a system disturbance, these inverters will usually shut down the output until the disturbance has passed, and will need to set up the system before restarting the inverter's output after a major power outage.
"Most of the battery storage deployed globally provides only partial grid stabilization, but the next generation of battery storage – especially the use of 'grid-based' energy storage with virtual synchroniser technology – is essential for renewables to completely replace fossil fuels based on synchronisation," reported Glassmire, Senior Consultant for Grid Edge Solutions at Hitachi Energy. ”
The grid-based energy storage control technology mainly uses the energy storage inverter to build a voltage source that supports the stable operation of the large power grid, which plays the role of rapid frequency and voltage regulation, increasing inertia and short-circuit capacity support, and suppressing broadband oscillation, so as to enhance the stability of the power system.
With the increase of the penetration rate of new energy and power electronic equipment, the power system has a tendency of decreasing inertia and weakening system strength, and the stability problem is becoming more and more serious. The grid-based energy storage control technology can improve the voltage and frequency support capacity of the converter and enhance the stability of the power system. When "network-building" technology is combined with advanced automation and control, there is a "virtual synchronization machine".