ABSTRACT:
This
paper proposes an adaptive power decoupling control strategy for a single-phase
rectifier with an unbalanced split-capacitor decoupling circuit. Since a
capacitance mismatch estimator is integrated into the control strategy, the
impact of capacitance mismatch is eliminated. Meanwhile, the capacitance mismatch
estimator can provide an auxiliary online monitor for the health of
split-capacitors. Moreover, the mechanism of capacitor voltages self-balance is
explained. Finally, experiments are conducted to verify the effectiveness of
the proposed method.
KEYWORDS:
1. Active
power decoupling
2. Adaptive control
3. Dc
split- capacitor
4. Single-phase
converter
5. Capacitance
mismatch
SOFTWARE: MATLAB/SIMULINK
SCHEMATIC DIAGRAM:
Fig.
1. Proposed control diagram for single-phase power converter with DC split- capacitor
power decoupling circuit.
EXPECTED SIMULATION RESULTS:
Fig.
2. Simulation results of the proposed adaptive decoupling controller. (a) Case
I; (b) Case II; (c) Case III.
CONCLUSION:
In
this paper, an adaptive power decoupling controller is proposed for the DC split-capacitor
decoupling circuit under capacitance
mismatch. The conclusions are listed below: 1) The steady-state analysis of DC
split-capacitor decoupling circuits shows that there are infinite feasible
solutions to achieve the decoupling of twice ripple power under capacitance
mismatch. Among them, a special solution is to control the capacitor voltages
into DC and the fundamental frequency sinusoidal AC component. 2) Under the
framework of the special solution, an adaptive power decoupling controller is
proposed to realize the decoupling of twice ripple power. 3) The capacitance
mismatch estimator is presented to estimate the unequal factor online.
Consequently, the fundamental frequency power ripple caused by capacitor mismatch
is eliminated. Meanwhile, the estimated unequal factor can be used as a health
monitoring indicator of split-capacitors.
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