Design a 12V standalone DC PV system to power a clinic with DC fridge/freezer combination to store vaccines in addition to light, test equipment with five days of storage. The maximum daily demand is 90 Aħ occurs during summer. Assume the peak sun hour is 6, The available NABRA modules have Voc =21.7, Isc = 6.5 A, Vyp=17.4, and IMp = 5.8A at STC. The module de-rating factor is0.8, wire efficiency is 0.98 and battery charge efficiency is0.9 Use the Abri 12 V, 220 Ah deep cycle battery with 0.8 depth of discharge and-0.9 temperature derating. 1) What is the energy (Ah) to be supplied by modules? 5 days 90 Ah/d 450 Ah 2) How many modules are required? a) Modules in in Series Ump : 19.4 v 7 12V 12U System in I module sevies in b) Modules in parallel ONE 3.67 strings 4 modules in parallel 90 Auld = (5.8A . 6urs.o.8.098 ·0.9)~- 3) Calculate the battery system size? a) batteries in parallel
Load flow analysis
Load flow analysis is a study or numerical calculation of the power flow of power in steady-state conditions in any electrical system. It is used to determine the flow of power (real and reactive), voltage, or current in a system under any load conditions.
Nodal Matrix
The nodal matrix or simply known as admittance matrix, generally in engineering term it is called Y Matrix or Y bus, since it involve matrices so it is also referred as a n into n order matrix that represents a power system with n number of buses. It shows the buses' nodal admittance in a power system. The Y matrix is rather sparse in actual systems with thousands of buses. In the power system the transmission cables connect each bus to only a few other buses. Also the important data that one needs for have a power flow study is the Y Matrix.
Types of Buses
A bus is a type of system of communication that transfers data between the components inside a computer or between two or more computers. With multiple hardware connections, the earlier buses were parallel electrical wires but the term "bus" is now used for any type of physical arrangement which provides the same type of logical functions similar to the parallel electrical bus. Both parallel and bit connections are used by modern buses. They can be wired either electrical parallel or daisy chain topology or are connected by hubs which are switched same as in the case of Universal Serial Bus or USB.
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