Abstract:
In this report, the modeling process and operation of a hybrid power system is studied. It is built based on a hypothetical study of electrification of a coastal are Kuakata in Bangladesh. The power demand is estimated and the costs of equipment components are specified after extensive research, so that the techno-economical design of the system can be carried out. The micro-grid consists of solar PV, wind turbine, bio-gas generator, batteries, diesel generator and basic loads. The system is modeled and simulated in terms of power management and its operation as well as the performance of the dispatch strategy is assessed. Problems like the management of extra power or tackling the deficit of power in the system are addressed. The model represents reliably the behavior of the micro- grid and several improving actions are suggested.
Detailed simulations and financial analysis are performed with HOMER to compare different systems and their viability. Once the Hybrid system is determined a detailed design is done to optimize the lowest cost PV-Wind-Biogas based hybrid system. The system renewable fraction is 100% and the project life cycle is 25 years. The hybrid system is projected to produce electricity at a cost of 0.217 USD/kWh.
In addition, single line diagram of proposed hybrid system in both grid connected mode and standalone mode has been addressed. On AC side, Wind, Diesel generator and Bio-gas generator are connected into the main grid and on DC side, Solar PV and battery banks are used. Standalone system is considered by removing diesel generator and utility grid from the single line diagram. The impact of different wind speeds and sun irradiation have been investigated for this hybrid micro-grid in both islanded and grid-connected modes of operation. The hybrid micro-grid analysis is simulated using Electrical Transient and Analysis Program (ETAP) software. Load flow study, Short circuit analysis, Harmonics analysis as well as transient stability analysis have been analyzed for different case studies.
