ABSTRACT:
This
paper depicts a new configuration for modular hybrid power conversion systems,
namely, multi-hybrid generation system (MHGS), and parallel connection at the
output, such that the converter of each unit shares the load current equally.
This is a significant step towards realizing a modular power conversion system architecture,
where smaller units can be connected in any series/parallel grouping to realize
any required unit specifications. The supercapacitor (SC) as a complementary source
is used to compensate for the slow transient response of the fuel cell (FC) as
a main power source. It assists the Fe to meet the grid power demand in order
to achieve a better performance and dynamic behavior. Reliable control of the
proposed MHGS with multiple units is also a challenging issue. In this paper, a
simple control method to achieve active sharing of load current among MHGS
modules is proposed. The simulation results verify the performance of the
proposed structure and control scheme.
KEYWORDS:
1. Multi-hybrid
generation system (MHGS)
2. Fuel
cell (FC)
3. Dc/dc converter
4. Supercapacitor (SC)
5. Average load sharing (ALS)
SOFTWARE: MATLAB/SIMULINK
CIRCUIT
DIAGRAM:
Figure 1. Configuration of the FC/SC hybrid system.
CONTROL
SYSTEM:
Figure
2. Proposed control strategy of hybrid FC/SC power conversion
.
EXPECTED SIMULATION RESULTS:
Figure
3. Dynamic response of MHGS, (a) load active power, (b) output power of hybrid
units, (c) FC stack and SC module power of first hybrid umt, and (d) FC stack
and SC module power of second hybrid unit.
Figure
4. Output waveform of (a) dc bus voltage, and (b) dc bus current.
Figure
5. Waveforms of unit's (a) hydrogen input flow, (b) hydrogen partial
pressure,
and (d) oxygen partial pressure.
CONCLUSION:
This
paper proposes a comprehensive and effective multihybrid FC/SC power generation
system structure and control strategy. The detailed model of the modular FC/SC
hybrid system which includes an FC stack as a main power source and an SC as a
complementary source is presented. In order to balance power sharing among the
units, average load sharing technique is used. Elimination of outer voltage
loop of ALS technique enhances reliability and reduces the complexity of the
control structure. To show the superior dynamic behavior and power sharing of
the proposed MHGS, results for two parallel hybrid systems are provided. The
presented analysis and the simulation results offer a valuable structure with
an effective control strategy to enhance power quality and management. These
performances allow the integration MHGS into complex distributed generation
systems such as microgrids.
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