Feasibility of floating solar PV integrated pumped storage system for a grid-connected microgrid under static time of day tariff environment: A case study from India

Abstract

This paper investigates the possibilities of a small-scale floating solar PV integrated Pumped Storage Hydroelectric (PSH) system in India, where a subsidized Time-of-Day tariff is employed. Finding and utilizing new reservoirs and water bodies in hilly areas for electrical energy storage and renewable energy integration is vital for more extensive renewable energy exploration. Prior studies in India have not explored the possibility of integrating floating solar PV systems with small-scale PSH systems. PSH systems and floating solar PV systems are modeled from fundamental relations. Objective function and constraints are formulated based on the operating conditions of the system and the grid energy tariff in India. The levelized cost of solar energy and the levelized cost of stored energy is estimated to analyze the economic aspects of the proposed system. For optimal scheduling, developed a linear programming solver-based optimization algorithm. In addition, this study utilized particle swarm optimization for optimal sizing of the system. The results of this study validate the feasibility of the proposed method. Economic savings of floating solar PV resulted in a levelized cost of 0.8518₹/kWh, and the availability of existing cascaded reservoirs brought on a levelized cost of 4.2713₹/kWh for stored energy. Compared to the grid-alone system, the proposed system reduced the daily operating cost and loss of load probability. The proposed system performs economically in a subsidized static tariff environment.