H-bridge cascade energy storage system

Abstract

The invention relates to an H-bridge cascade energy storage system, and the system comprises a plurality of cascaded energy storage sub-modules which are connected with one phase of an AC bus in a one-to-one correspondence manner after being cascaded; the energy storage sub-module comprises a battery unit, a resonant circuit module connected with the battery unit in parallel and an H bridge connected with the battery unit in parallel, the resonant circuit module comprises a plurality of resonant sub-circuits connected in parallel, and the number of the resonant sub-circuits is determined according to the frequency band of the ripple current of the energy storage sub-module. The resonant frequency of each harmonic oscillator circuit corresponds to one frequency band of the ripple current; the battery unit is used for storing direct-current electric energy, the resonance circuit module is used for filtering harmonic waves of corresponding frequency bands, and the H bridge is used for converting the direct-current electric energy provided by the battery unit into alternating-current electric energy and providing the alternating-current electric energy to the alternating-current bus of the corresponding phase.

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