PV educator

Week 11 by HadeedAhmedSher on Scribd

Week 10 

Week 9 by HadeedAhmedSher on Scribd

Consider Fig. 1 where a voltage source / current source is applied to a load (A box is shown and it is assumed to be a resistance R). If we do not use power electronics for amplitude shift then efficiency apart, we can only step down the amplitude.

Figure 1 Resistance based dc-dc voltage converter (click to zoom)

Both of these two methods exhibits low efficiency when the ratio between the input and output is low.

Efficiency =  (P_o/P_in)= (V_oI_o)/(V_inI_o). For the current source the (V_o/V_in) is constant therefore, the efficiency= (I_o/I_in). Same is the case with the voltage source.

Now, since the output is always less than 1 and that if the network has to step down the input current of 10A to 1A, the efficiency is only 10% as shown in Fig.2. The red part accounts for the power loss.

Figure 2 Ratio of input and output (Click to zoom)

Simulation of Power Electronics Circuits using SIMULINK

Understanding simulation tools is essential for the engineers nowadays. It is because they provide the first platform to test the hypothesis and ideas. Several simulation software are available in market that can be used to simulate the circuits. Recently, while i was arranging my documents i came across a wonderful article on the simulation of power electronic converters using matlab-simulink, and in this blog post i would like to  present my thoughts about this work. So here is what my review is

Solar PV modules are typically connected to an dc-dc converter for ensuring the operation at maximum available power. While the research work has shown us the possibilities of using different kinds of dc-dc converters, following three basic topologies are still widely used.