Energy storage causes grid oscillation

Can grid-forming battery energy storage systems mitigate sub-synchronous oscillations?

In this manuscript, the combination of static and dynamic techniques is utilized and consolidated to derive general conclusions when mitigating sub-synchronous oscillations by means of grid-forming battery energy storage systems (GFM BESSs).

What are voltage/power system oscillations?

Voltage/power system oscillations in the grid are observed under different operational conditions and faults. For instance, 17-Hz power system oscillations with a maximum peak-to-peak magnitude of 1.57%, as the ones previously presented, appear when the output of the wind farm is above 130 MW.

How does grid strength affect grid impedance?

the strength of the grid: the shaping effect over grid impedance will depend on the point of connection and existing stability margin . System strength is proportional to the fault level (and inversely proportional to the equivalent impedance) at a given location.

How unstable is a stable grid after tripping a Bess?

A stable grid becomes unstable after the tripping of the BESS at t = 1 s, and the oscillation frequency of active/reactive power from IBRs is 16.75 Hz according to fast Fourier transform (FFT) results.

How does GFM Bess affect grid impedance shaping?

The grid impedance shaping effect of GFM BESSs, which allows the mitigation of undesired oscillations, is demonstrated through small-signal (static) and frequency scanning (dynamic) analyses when studying an actual and extremely weak grid, the Australian West Murray Zone.

How to measure the system strength of a grid?

To measure and screen the system strength of the grid, the short-circuit MVA capacity (SCC) is obtained at the high-voltage bus (220 kV) of Fig. 3 following the methodology of .