3C strategy for inverters in parallel operation achieving an equalcurrent distribution
Tsai-Fu Wu; Yu-Kai Chen; Yong-Heh Huang
Industrial Electronics, IEEE Transactions on
Volume 47, Issue 2, Apr 2000 Page(s):273 - 281
Digital Object Identifier 10.1109/41.836342
Summary: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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