Standalone hybrid generation system for the remote area of Thar, Pakistan
The parallel strings, Nbat are used to meet design requirements like [11, 17]:
- To increase the existing battery capacity
- To provide redundancy
- To provide battery reserve in case of string disconnection for maintenance
To ensure an optimal and safe cell recharge voltage, calculation of the number of series cells is
important. The number of series cells can be determined from the battery window voltage limits and
voltage per each cell, as given [20] below.
2.41
Where,
Ncell = number of series cells.
Vbat, max/min = maximum or minimum nominal battery voltage.
Vcell,max/min = maximum or minimum cell voltage at Vbat,max or Vbat, min respectivel.y
The lowest maximum voltage, Vmax and the highest minimum voltage, Vmin define the voltage
window within which all loads in the system operate properly. In general, it is economical and
recommended [20] to use fewer cells of higher capacity than more cells of lower capacity while sizing
the battery system. The total number of batteries required in series will be [11]:
2.42
And the total batteries required in the system are:
2.43
2.6. Power Electronics
A generalized block diagram representation of power electronics interface associated with DE
systems is shown in Figure. The power electronics interface accepts power from the distributed
energy source and converts it to power at the required voltage and frequency. For the storage systems,
bidirectional flow of power between the storages and the utility is required. Figure shown below
illustrates a design approach to organize the interface into modules, each of which can be designed to
accommodate a range of DE systems and/or storages.
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