The objective of this paper is to model a hybrid power system for buildings, which is technically feasible and economically optimal. With a view to promote renewable energy sources, photovoltaics and wind turbines are integrated with the grid connected building. The system is modeled and the optimal system configuration is estimated with the help of hybrid optimization model for electric renewables (HOMER). The logic is illustrated with a case study based on the practical data of a building located in southern India. This building is associated with 3.4 MWh/day priority load (peak load as 422 kW), as well as 3.3 MWh/day deferrable load (peak load as 500 kW). Sensitivity analysis is performed to deal with uncertainties such as the increase in electricity consumption and grid tariff, environmental changes, etc. From the simulation result, it is observed that the designed system is cost effective and environment friendly, which leads to 6.18 % annual cost savings and reduces CO 2 emissions by 38.3 %. Sensitivity results indicate that the system is optimal and adaptable in a certain range of unanticipated variances with respect to best estimated value. Finally, an energy management strategy is developed for the optimal system to ensure reliable power during contingency and disturbances. The green and hybrid power system designed can be adaptable to any critical and large consumers of urban buildings.
Microgrids deployment is primarily envisioned to meet the energy needs of remote areas due to inaccessibility of utility power. But, due to the recent globalization epoch, the rural and remote areas in the world are merging into urban communities and creating huge burden on the utility grid. Hence, the microgrids design focus has been shifting towards urban communities. Hybrid power systems are becoming a popular way in the design of microgrids by using locally available renewable energy sources (RES). This compensates the global depletion of conventional fossil fuel based utility grid energy. At this point of time, it is very important to examine the adoptability of those recent evolutions for a specific user location. With this intent, this paper presents various prospects in terms of challenges, opportunities, and technoeconomic feasibility analysis for the integration of various RES to an existing urban building power system. The analysis is done by considering practical data of an enterprise building located in India. Various RES such as, photovoltaics, parabolic troughs, and wind energy are considered to form the microgrid. The simulation results increase the faith on the designed architecture by projecting an average cost savings of 27.55 %/day on the energy utilization with 5.97 years of return on investment. This analysis can be adoptable for any large scale urban community buildings such as financial districts, universities, residential greater communities, and industries.
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