Purpose This study aims to investigate the inertia and damping support mechanism of the cascaded H-bridge converter-based battery energy storage system (CHB-BESS). The research helps improve the support performance of the CHB-BESS on the power electronics-based power systems. Design/methodology/approach The study designs a dual-mode virtual inertia and damping control scheme. The first mode is adopted under the inertia response period. The second mode is adopted under the primary frequency control period after the frequency nadir/zenith to help the frequency recovery. Comparative electromagnetic transient simulation and experiments are conducted. Findings The results reveal that both maximum frequency deviation and steady deviation is reduced by the proposed scheme. Under the 0.03 p.u. load changes, the frequency deviation is reduced by up to 7.6%, and the time that the system frequency reaches the steady value can be reduced by about 1.7 s, and the steady state frequency deviation is reduced by about 8.8%. Originality/value This study further explores the frequency of the CHB-BESS and provides a valuable solution to the power system frequency regulation.
Yu et al. (Mon,) studied this question.