Performance study of Synchronization in grid- connected photovoltaic systems

Due to the current situation, the world in general and South Africa in particular, facing energy shortage and climate change due to the pollution caused by the production of non-renewable energy, so that we can save the world of pollution, we have to look at another way to generate energy that will be clean. This project will study and the gentle way to generate electricity and feed it into the existing electricity grid using one of the synchronization methods. for us to able to injecting safely and fast PV system energy into the local grid system we need to fulfil these 5 conditions: The PV system must have the same line voltage, frequency, phase angle, waveform and phase sequence as the local grid system. There are many technics to use for synchronization between two or more different sources of energy to take place, this project used the SRF PLL technic. The basic idea of the SRF PLL is a feedback system with PI regulation tracing the phase angle. the voltage signals Va; Vb and Vc are transferred from three phases to a stationary system of two phases Vα and Vβ. The grid voltage is given as Va; Vb and Vc. This project Using Euler forward (Kaura and Blasko 1997) by taking the Mathematique expression Z-transform to calcult the PI regulation, and the smillation result show that the PI trucking the angle very fast and uder all the codition, balance or unbalance, adeal or non-adeal.