Cost Optimization and Emission control of a Grid connected Hybrid PV-Wind system for a Health Care Centre in India

Abstract

Due attention is needed for energy demand in health care centers as energy requirement for average Energy Use Intensity (EUI) is huge. It is to be noted that EUI is the energy per square foot per year. The technology advancement result in sophisticated and inevitable equipment, increases the energy consumption of the health care centers. The maintenance of these equipment and increase in the patient to doctor ratio are also one of the main reason which affects the energy consumption. India is found to be the fourth largest greenhouse gasses emitter. As a result, India is much affected by the change in climatic conditions. Therefore the obligatory situation is arised in India to reduce the global warming which can be possible with the penetration of renewable energy based electricity generation. Our major objective is to produce the electrical energy with the optimized PV- wind system and to avoid the global warming with the optimized energy generation technology.

The novelty in the work is to generate the electricity with Hybrid pv-wind system for a health care centre in India, and to payback the excess energy produced to the electricity board through grid system.  

A health care center which uses 160kWh/day of electrical load and deferrable load of 10kWh/d is taken for analysis. 200 kW of PV and 100 kW of wind generation capacity are proposed for generating power. The monthly average wind speed profile and solar profile is downloaded from NASA Prediction of Worldwide Energy Resource database. 300kW converter is used, with the mean output of 38.8W capacity is used in the proposed system for power conversion.An idealized battery storage system of 48V is introduced with the capacity of 139kWh and round trip efficiency of 64%.

Homerpro 3.11.2 is used to obtain and analyse the optimization result. The analysis gives best solution for cost summary, economic comparison in using various resources. This microgrid requires 1938 kWh/day and has a peak of 305 kW. In the proposed system, the energy demand, energy selling and cost analysis is done. The energy demand of the health care system is estimated and the remaining energy produced is sold back to the grid. Grid power is connected to the system with simple rates of grid power rate and sell back rates.

From the Homer Analysis, the Net Present Value, total Annualized Cost, simple payback, Return on Investment (ROI), the Internal Rate of Return (IRR) and annual savings are estimated for the proposed system. It is estimated that our investment has a payback of 1.33 years and an IRR of 75.3%. The annual energy purchased from the grid is 6,639 kWh and the annual energy sold to the grid is 643,549 kWh.

Along with the cost analysis,  the emission of gases like carbon dioxide, carbon monoxide, unburned hydrocarbons, particulate matter, sulfur dioxide and nitrogen oxides are also calculated for the proposed system. The analysed result gives null result for the emission of green house gases and the proposed system becomes environmental friendly system in reducing the global warming. Also cost analysis of the proposed system proves the annual savings in regards with the energy consumption.