This Computer Aided Design for a PV System And Investigation Of 3 Phase Thyristor Converter project report is the brief description of Computer Aided Design, Pv System And Investigation and Thyristor Converter used to converts energy from the sunlight into electricity. The report explains the details of energy conversion in two parts with different aspect of energy.
A photovoltaic cell converts energy from the sunlight into electricity. The radiation from the sun is made up of tiny particles of energy called photons. As these photons impact on the cell, some of them are absorbed into the cell. The energy from the photons on impact causes electrons to be free. The movement of the free electrons is what generates electricity.
A thyristor is a switching semi conductor device that is unidirectional, that is to say it can only conduct in a single direction. It can be seen that a thyristor is basically a combination of PNP and NPN bipolar transistors. To make the thyristor conduct a voltage is applied at the gate which turns on the NPN transistor which in turn makes the PNP to start conducting. Once both transistors are ON, they remain ON until turned OFF. Due the mode of operation and behaviour as described earlier, thyristors are used in 3 phase rectified circuits. This type of rectifier using thyristors is referred to as line commutated controlled rectifier.
A PV system can be made to track maximum power point by incorporating a PI controller into the PV system. The PI controller adjusts the PV voltage based on the maximum power point. With properly tuned values of proportional gain and integral gain, the PI controller reduces ripples and improves transient response. In a 3 phase thyristor rectifier using 6 thyristors, the thyristors are triggered it sequence resulting in the formation of 6 pulse DC voltage waveforms.
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