The battery bank in an ESS needs a low ripple environment to extend the lifetime. For filtering the switching ripple on the DC bus, large electrolytic capacitors are needed to absorb the current ripple which leads to a bulky capacitor bank. If we can choose film capacitors instead, this problem can be solved. Moreover, film capacitors also have other advantages like longer life time and low equivalent series resistance (ESR). This paper shows some simulation results by PSIM to support the replacement.
Link to paper: DC Link Capacitor Selection for Energy Storage Systems