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Operation control of paralleled three-phase battery energy storage system

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4 Author(s)
Liaw, C.M. ; Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan ; Jan, L.C. ; Wu, W.C. ; Chiang, S.J.

Parallel operation for capacity enlargement of a three-phase battery energy storage system (3φ BESS) is presented. The proposed paralleled system consists of some inner-loop parallel-connected current-regulated pulse width modulated (CRPWM) converters, a current command distributor and an outer-loop common controller. Every single-module CRPWM 3φ converter possesses good current tracking control characteristics, so is easy to parallel connect. The proposed current command distributor receives current commands from the common controller and generates suitable current commands for each paralleled converter module according to the proposed current sharing control strategy. The sophisticated system arrangement of the common controller gives the BESS many power processing functions. When it is connected to the utility grid, it can be arranged to give peak load shaving, active power filtering, power factor and battery charging. In the event of utility failure the BESS can supply uninterrupted power with low distortion sinusoidal voltage waveform to critical loads. Performance of the proposed paralleled BESS at various operating conditions is demonstrated experimentally

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:143 ,  Issue: 4 )