Planning And Optimization Of Hybrid Microgrid System For An Industrial Demand

The industrial zone is of great importance for economic development of every country.The energy crisis in Pakistan has become the main problem in the economic growth of the country.There are many industrial processes that need continuous supply;even a small outage can cost millions of dollars.The main cause of "load shedding" in Pakistan is that it generates a major share of its energy from fossil fuels,whose price and demand is continuously increasing.Most of the industrial and commercial customers use Diesel Generator(DG)as a reliable alternative source of electrical power when grid supply is not available.The use of DG in loading shedding hours would increase the Cost of Energy(COE)per KWh and also increase the environmental emissions.Pakistan has a wide range of renewable power sources like bioenergy,wind,solar,hydel,geothermal etc.The distinct emphasis on the implementation of an industrial microgrid in Faisalabad,Pakistan has been specified in this work.There are three main advantages of a Microgrid:cost reduction,fuel saving,and improved environmental emissions.The optimization objective of this work is to maximize these benefits.Several researches were carried out to improve the hybrid microgrid system but there are still some factors which were not considered carefully.This study contributes to the ongoing studies about planning and optimization of hybrid microgrid system and pulls attention to the optimal design and sizing considering several techno-economic factors including Net Present Cost(NPC),Cost of Energy(COE),supply reliability,capacity shortage constraint,battery State of Charge(SOC),dispatch strategy,PV power generation and PV array tracking systems.On the other hand a new operation strategy'is proposed in this work for hybrid micro-grids,which serve the load according to their priority and make good use of excess electricity.The proposed operation strategy not only improve the efficiency of the components but it also helps to reduce the cost especially O&M cost and replacing cost of the components.Different cases are studied;microgrid sizing,techno-economic exploration,sensitivity analysis and environmental effects are addressed using(Hybrid Optimization Model for Electric Renewables)HOMER.Proposed operation strategy effectively distribute the generation of all units among all the loads according to their priority which makes the system more efficient and reliable.The results depict that COE and environmental emissions have been meaningfully reduced for the proposed system.