3C strategy for inverters in parallel operation achieving an equalcurrent distribution
Tsai-Fu Wu
Yu-Kai Chen
Yong-Heh Huang
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Apr 2000
Volume: 47,
Issue: 2
On page(s): 273-281
ISSN: 0278-0046
References Cited: 19
CODEN: ITIED6
INSPEC Accession Number: 6573365
Digital Object Identifier: 10.1109/41.836342
Current Version Published: 2002-08-06
Abstract
A circular chain control (3C) strategy for inverters in parallel
operation is presented in the paper. In the proposed inverter system,
all the modules have the same circuit configuration, and each module
includes an inner current loop and an outer voltage loop control. A
proportional-integral controller is adopted as the inner current loop
controller to expedite the dynamic response, while an
H∞ robust controller is adopted to reach the robustness
of the multimodule inverter system and to reduce possible interactive
effects among inverters. With the 3C strategy, the modules are in
circular chain connection and each module has an inner current loop
control to track the inductor current of its previous module, achieving
an equal current distribution. Simulation results of two-module and a
three-module inverter systems with different kinds of loads and with
modular discrepancy have demonstrated the feasibility of the proposed
control scheme. Hardware measurements are also presented to verify the
theoretical discussion
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