Energy storage to control harmonics

Why do battery energy storage systems have a harmonic problem?

In grid-connected mode, current-controlled battery energy storage systems (BESS) face the issues of harmonic caused by nonlinear loads and interactive instability under weak grids. Firstly, the mechanisms of mid-frequency oscillations (MFO) and mid-frequency harmonics (MFH) are revealed by the impedance network theory and the circuit principle.

Can a battery energy storage system suppress mid-frequency oscillations and MFH?

Conclusion This paper presents a quasi-harmonic voltage compensation control of current-controlled battery energy storage systems (BESS) for suppressing mid-frequency oscillations (MFO) and mid-frequency harmonics (MFH). The main conclusions are as follows.

Can a filter suppress the harmonics of a pulse load?

However, the conventional filter-based method can only suppress harmonics extracted by the filter, and it is difficult to effectively suppress the harmonics of uncertainty loads, such as coupled harmonics introduced by the pulse load. First, the mechanism of grid current distortion caused by nonlinear loads is revealed based on the impedance model.

Can broadband harmonics be suppressed without harmonic extraction filters?

Finally, simulation and experimental results verify that the proposed control can effectively suppress broadband harmonics without harmonic extraction filters. Harmonic currents introduced by nonlinear loads are prone to cause grid current distortion.

What causes mid-frequency harmonics in power systems?

Furthermore, the widespread use of power electronic equipment featuring strong nonlinear characteristics in loads makes the user end filled with various harmonic sources [10, 11]. These sources become the primary cause of mid-frequency harmonics (MFH) in power systems. Fig. 1. Power supply schematic of battery energy storage systems.

What is a grid-connected battery energy storage system (BESS)?

Simple controller implementation. In grid-connected mode, current-controlled battery energy storage systems (BESS) face the issues of harmonic caused by nonlinear loads and interactive instability under weak grids.