ABSTRACT:
This
work deals with the frequency regulation, voltage regulation, power management
and load levelling of solar photovoltaic (PV)-battery-hydro based microgrid
(MG). In this MG, the battery capacity is reduced as compared to a system, where
the battery is directly connected to the DC bus of the voltage source converter
(VSC). A bidirectional DC–DC converter connects the battery to the DC bus and
it controls the charging and discharging current of the battery. It also
regulates the DC bus voltage of VSC, frequency and voltage of MG. The proposed
system manages the power flow of different sources like hydro and solar PV
array. However, the load levelling is managed through the battery. The battery
with VSC absorbs the sudden load changes, resulting in rapid regulation of DC
link voltage, frequency and voltage of MG. Therefore, the system voltage and frequency
regulation allows the active power balance along with the auxiliary services
such as reactive power support, source current harmonics mitigation and voltage
harmonics reduction at the point of common interconnection. The experimental
results under various steady state and dynamic conditions, exhibit the
excellent performance of the proposed system and validate the design and
control of proposed MG.
SOFTWARE: MATLAB/SIMULINK
Fig. 1 Microgrid Topology and MPPT Control
(a)
Proposed
PV-battery-hydro MG
Fig. 2 Dynamic performance of PV-battery-hydro
based MG following by solar irradiance change
(a) vsab, isc, iLc and ivscc,
(b) Vdc, Ipv, Vb
and Ib, (c) vsab, isa,
iLa and ivsca, (d) Vdc,
Ipv, Vb and Ib
Fig. 3 Dynamic performance of hydro-battery-PV
based MG under load perturbation
(a) vsab,
isc, Ipv and ivscc, (b) Vdc, Ipv, Vb and Ib, (c) vsab, isc, Ipv
and ivscc, (d) Vdc,
Ipv, and Vb
CONCLUSION:
In
the proposed MG, an integration of hydro with the battery, compensates the
intermittent nature of PV array. The proposed system uses the hydro, solar PV
and battery energy to feed the voltage (Vdc), solar array current (Ipv),
battery voltage (Vb) and battery current (Ib). When the
load is increased, the load demand exceeds the hydro generated power, since
SEIG operates in constant power mode condition. This system has the capability
to adjust the dynamical power sharing among the different RES depending on the
availability of renewable energy and load
demand. A bidirectional converter controller has been successful to maintain
DC-link voltage and the battery charging and discharging currents. Experimental
results have validated the design and control
of the proposed system and the feasibility of it for rural area
electrification.
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