Int. J. Energy Technology and Policy, Vol. 13, Nos. 1/2, 2017 53 Copyright © 2017 Inderscience Enterprises Ltd. Optimisation of hybrid power system connected to single directional grid C.P. Vineetha* and C.A. Babu Division of Electrical Engineering, Cochin University of Science and Technology, Kochi, India Email: vineethacp@gmail.com Email: drcababu@gmail.com *Corresponding author Abstract: This paper proposes development of model and algorithm of hybrid power system (HPS) connected to single directional grid to determine optimal HPS. Photovoltaic (PV) module and windmill are taken as renewable energy sources (RES) of HPS. Solar lead acid battery is taken as storage device. Hybrid inverter with maximum power point tracking (MPPT) controllers is used to interlink the RES, load, battery and grid. One year hourly wind speed, solar irradiation and temperature data are the inputs to the system. The optimal HPS is determined with least energy cost satisfying the constraints. Analysis is carried out in individual RES also. Comparison of optimal energy cost with conventional energy cost is done to evaluate the economic impact of the systems. The results show that the optimal systems are financially viable for both combined and individual RES and most feasible system is HPS. Keywords: distributed renewable energy generation; hybrid power system; HPS; renewable energy source; PV module; windmill. Reference to this paper should be made as follows: Vineetha, C.P. and Babu, C.A. (2017) ‘Optimisation of hybrid power system connected to single directional grid’, Int. J. Energy Technology and Policy, Vol. 13, Nos. 1/2, pp.53–72. Biographical notes: C.P. Vineetha received her BTech in Electrical and Electronics Engineering and an MTech in Power System from Calicut University, Kazhikode, India. She has 12 years experience in Kerala State Electricity Board, Kerala India. Currently, she is working towards her PhD in Electrical Engineering at Cochin University of Science and Technology, Kochi, Kerala, India. Her field of interest includes renewable energy, distributed generation, energy management and smart grid. C.A. Babu received his BSc (Engineering) and MTech degrees both in Electrical Engineering from Cochin University of Science and Technology (CUSAT), Cochin, India and PhD in Electrical Engineering from National Institute of Technology, Calicut, India. After acquiring a few years of industrial experience, he joined as a faculty member in the Electrical Engineering Division of School of Engineering, CUSAT. Currently, he is a Professor in Electrical Engineering at School of Engineering, CUSAT, Cochin, India. His research interests are energy conservation and management, industrial load management, safety in electrical systems, renewable energy and distributed generation.