In the present paper the software Hybrid Optimization Model for Electric Renewables (HOMER) is used to optimal design and analyze a domestic power system which includes a grid connected solar photovoltaic (PV) based power system along with battery storage to supply a single residential load located near Siliguri, West Bengal (with latitude and longitude of 26 0 72'N and 88 0 41'E respectively). In this context, the analyses have been carried out in two modes -grid connected and standalone. The simulation results obtained are mainly on cost of energy, pay-back period, environmental emissions etc. On the basis of these results, two modes are compared with the grid-only (base) mode. Performance of each component (i.e. battery, inverter, rectifier etc) of the model is evaluated and finally sensitivity analysis is performed to optimize the system at different conditions.The Government subsidy is, also, addressed into the analyses.

Issues like restructuring of power markets, fossil fuel shortage and environmental pollution are encouraging higher penetration of solar PV in the LV residential system. This paper presents a case study on a 2 kW grid connected PV system without battery storage, being located near Siliguri in Darjeeling District (West Bengal). The latitude and longitude of the study area are 26 0 72'N and 88 0 41'E respectively. Both economic, like payback period, as well as environmental analyses have been performed on the system under optimal PV energy output condition and compared with the grid-only (Base) case. Finally sensitivity analysis is performed to optimize the system at different conditions.

Distributed energy systems are gaining widespread popularity in recent times as they are capable of generating power with a minimum running cost. They are also highly effective since they are located close to the load which reduces the transmission losses to a significant extent. Energy starved countries have opened up business opportunities to industries which can generate electricity and export them to the grid. The purpose of this paper is to evaluate the economic feasibility of using a compressed air energy storage (CAES) system for distributed generation sources or captive power plants when it operates in islanded mode. This paper presents the application of CAES system as a viable energy storage method to be used as a dump load when the source operates in islanded mode. Based on the data of a sample case, cost analysis is being carried out to ensure the economic feasibility of implementing such a system for a captive power plant. The detailed cost analysis for implementing such a system is presented together with a simple methodology to be followed for selecting a compressor. Implementing an energy storage system always improves the performance of the system as it is capable of smoothing out the fluctuations. For plants which are exporting power to the grid, it also improves the operating profit of the plant by acting as a buffer in situations when there are minor disturbances in the grid and the plant is forced to operate in islanded mode. The sample case study is being done for the possible application and implementation of the suggested energy storage system, and the findings show that even though the initial cost of such a system is on the higher side, it can be helpful in the long run. The proposed system will be helpful to supply peak loads and also increases the profit of such sources who export power to the grid. The proposed system is applicable only to sources which are connected to the grid and it works well only when there is a sustained period of operation in islanded mode.

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