Assesment of Power Quality of Photovoltaic Generations

Abstract

In the recent times distributed generations or renewable energies are very much needed for daily usage as the natural resources are on the verge of extinction. These renewable energy sources are a very good solution for the global energy problem. The usage of renewable energy, according to the statistics is around 17% all over the world, from which only 0.06% constitute of solar PV power. These statistics show that we are lagging behind from extracting the solar power. There are various factors that can be hold accountable for this viz. very costly equipment, lack of knowledge and even we do not have enough technology to harness the solar power. Solar power, as most renewable energy sources, is not a steady power source. We only can utilize or store it during daytime. We try to find the maximum power point (MPP) of the PV array and then it is supplied to the grid. There are two different methods to track the MPP – Perturb and Observe (P&O) method and Maximum Power Point Tracking algorithm method (MPPT). In this project MPPT algorithm is used to track the MPP. The MPPT algorithm uses the IPV and VPV of the PV array and gives the MPP and a VDC,REF. This voltage is then passed on to the inverter and then further to the three-phase grid. In this thesis the behaviour of the active and reactive power of the grid which is supplied by the PV array is investigated. The various currents such as inverter current, grid current and load currents are also investigated.