Non-Unit Protection Scheme Assessment of Stand-Alone PV Generating System

Due to recent energy policies and increased rate of global warming, to curtail the impact of greenhouse gas emissions, a source like solar plays an important role in power generation but it is affected by irradiance, temperature (which changes due to changing atmospheric conditions) and load. As PV array has a unique point depending on both temperature and irradiation, where the generation of power, is maximum, an optimum algorithm is necessary to implement. To get optimal power under all possible conditions, the maximum power point (MPP) must be accurately tracked. In this proposed work, the performance of Perturb & Observe (P&O) algorithm is analyzed. Depending on local geographical location, the simulation parameters of proposed model are taken. Here, different types of protection schemes incorporated with relay system are provided in the power system network. The primary aim of these schemes is to detect faults in the network and to isolate the faulted part from the remaining healthy system. The protective relays continuously monitor the power system and operate when any quantities deviate from their normal levels. In this work, the impedance type relay is considered for the test model for detection of faults and the protection of the system. The results of proposed system are analyzed and verified using MATLAB/Simulink software. It is found that the proposed scheme works effectively under all adverse situations like fault, irradiance etc.