ABSTRACT:
The
existing power management schemes for interlinked AC-DC microgrids have several
operational drawbacks. Some of the existing control schemes are designed with
the main objective of sharing power among the interlinked microgrids based on
their loading conditions, while other schemes regulate the voltage of the
interlinked microgrids without considering the specific loading conditions.
However, the existing schemes cannot achieve both objectives efficiently. To
address these issues, an autonomous power management scheme is proposed, which explicitly
considers the specific loading condition of the DC microgrid before importing
power from the interlinked AC microgrid. This strategy enables voltage
regulation in the DC microgrid, and also reduces the number of converters in
operation. The proposed scheme is fully autonomous while it retains the
plug-nplay features for generators and tie-converters. The performance of the
proposed control scheme has been validated under different operating scenarios.
The results demonstrate the effectiveness of the proposed scheme in managing
the power deficit in the DC microgrid efficiently and autonomously while
maintaining the better voltage regulation in the DC microgrid.
KEYWORDS:
1. Autonomous
control
2. Distributed
control
3. Droop
control
4. Hybrid
microgrids
5. Interlinked
microgrids
6. Power
management
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig. 1. Interlinked AC-DC
microgrids and their control strategy.
EXPECTED SIMULATION RESULTS
Fig. 2 Scenario 1: Results showing
(a) generators and tie-converter power, (b) DC microgrid voltage and (c)
tie-converter control signals for four different load operating conditions.
Fig. 3. Scenario 2: Results showing
(a) DC microgrid load demand, (b) generators and tie-converter power, (c) DC
microgrid voltage and (d) tie-converter control signals at varying solar PV and
load operating conditions.
CONCLUSION:
An autonomous power management
scheme has been presented for interlinked AC-DC microgrids having different
configurations. The proposed scheme manages the power deficit in the DC
microgrid efficiently and autonomously. The number of tie-converters in
operation has been reduced with the proposed prioritization to avoid
unnecessary operational losses. The scheme has demonstrated better voltage
regulation in the DC microgrid. The performance and robustness of the proposed scheme
have been validated for two different scenarios of the DC microgrid at variable
load conditions.
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