Standalone hybrid generation system for the remote area of Thar, Pakistan
charger. It is a DC-coupled configuration hybrid system in a sense that the renewable energy sources
are connected together at the DC bus to the battery and supply the AC
load via the bi-directional
inverter. Here, the AC power from the wind turbine must be converted into DC by utilizing AC/DC
converters or rectifiers before power is delivered to the DC-bus.
Fig. 2.41: (a) DC coupled configuration; (b) AC coupled configuration
The parallel hybrid power system with DC-coupling configuration
can further be improved by
connecting all of the renewable generators to the AC-bus to perform an AC-coupling configuration as
shown in Figure 2.41(b). The load can be supplied from the renewable energy supplies in parallel with
the diesel Genset. A bidirectional inverter is utilized here such that the battery can either supply the
load or be charged depending upon the load requirement and the status of other energy sources. Over
and above, the DC power obtained from the PV-array system and battery must be converted to AC
before it is fed into the AC-bus. This type of configuration is also referred to as centralized AC-bus
topology in a sense that all the energy generators are connected at the AC-bus and the load is supplied
at a single point [29].
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