Power Exchange among PV Systems through Bidirectional Converter

Abstract

PV systems have gained importance in past few years all over the world. Especially in the countries like Pakistan where energy crises is the serious issue. By focusing on the advancement of use of these systems we have strong concern with management and exchange of power among different systems through bidirectional DC-DC converter. Actually, this system is working on 4 modes of power sharing where condition decides which mode to operate at a time. We have designed two PV systems representing houses which are having main power source of solar panels and they are interlinked through the bidirectional converter for power exchange. If we talk about the specifications and characteristics of Solar panels which we are using then they shall give us 8V-18V voltages and about 25W-30W of power. These panels are good enough for our system to work smoothly. For battery charging, we are using SEPIC converter which behaves as a charge controller and the reason behind this is to make backup system for the project. This will assist us to give continuous power flow. After that we used bi-directional FLYBACK converter for the sharing of power among the systems. FLYBACK with the use of relays and Arduino also responsible for the power sharing as well as operating modes of our system. To display information we are used 16X2 LCD. There are four modes on which this project is working. In the first mode, power is being transferred from the system having more power to the system which needs more power to fulfil its requirements. In the second mode, same procedure is getting repeat but in opposite or reverse direction like first mode. In third and fourth mode, when both systems fulfilling their demands by their own then there will be cut off mode on and no power is being shared among systems. Simply, we can say that when there is unbalanced situation occurring only then systems help each other to manage power. On balanced condition bidirectional converter behaves as an open circuit.