access icon free High-efficiency three-phase bidirectional dc–ac converter for energy storage systems

© The Institution of Engineering and Technology
Received 31/07/2018, Accepted 08/04/2019, Revised 11/03/2019, Published 15/04/2019

This study presents a high-efficiency three-phase bidirectional dc–ac converter for use in energy storage systems (ESSs). The proposed converter comprises a modified three-level T-type converter (M3LT2C) and a three-level bidirectional dc–dc converter. The M3LT2C comprises two T-type cells to interface with a three-phase grid. By directly connecting the S-phase of the grid to a neutral point on the dc link, the active and passive components are required for only two grid phases, which reduces power losses, system volume, and production cost. A direct nominal voltage compensation control algorithm enables the converter to obtain high grid power quality. Also, the three-level bidirectional dc–dc converter enables low switching and conduction losses with reduced voltage stress across the switches. In addition, a simple dc-link voltage-balancing algorithm enables the balancing of two split dc-link capacitor voltages. To confirm the theoretical analysis of the proposed converter and assess its validity, a 10-kW prototype was implemented and tested.

Inspec keywords: DC-AC power convertors; power grids; energy storage; switching convertors; voltage control; power capacitors; DC-DC power convertors

Other keywords: high-efficiency three-phase bidirectional dc–ac converter; active components; direct nominal voltage compensation control algorithm; dc link; M3LT2C; three-level T-type converter; passive components; energy storage systems; grid phases; three-phase grid; three-level bidirectional dc–dc converter; split dc-link capacitor voltages; simple dc-link voltage-balancing algorithm; T-type cells; high grid power quality

Subjects: Other energy storage; DC-AC power convertors (invertors); Other power apparatus and electric machines; DC-DC power convertors; Voltage control; Control of electric power systems

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