Optimal Sizing of a Stand-alone PV/FC/Wind Hybrid System Using PSO Modified Algorithm

摘要

Renewable energy sources in energy generation can decrease the costs of system fuel and also can have desirable impact on reliability of system. So a suitable combination between the system reliability indices level and system capital investment costs is required. In this paper a hybrid system consist of wind turbine, photovoltaic (PV) arrays and fuel cell (FC) is designed in order to provide a specific pattern of load. The aim of this design is minimizing the cost of overall 20-year energy generation system in considering and not considering reliability indices constraints. Data’s related to load, solar irradiance and wind speed are considered deterministic. It is assumed that there is emergency outage probability of three main units through system components. These units include wind turbines, PV arrays and DC/AC converter. System costs include investment cost, cost of maintenance and repair and also costs associated with loss of load. PSO modified algorithm is used for system optimization and the results are compared with common PSO algorithm. Combining a modified intelligent algorithm with reliability evaluation causes an increase in the volume and as a result the calculation time. An approximate model is presented to estimate system reliability which caused a significant decrease in calculation time.