New approaches on the optimization of directly coupled PV pumping systems

We here use a multi-step optimization procedure to improve utilization of a direct-coupled photovoltaic water pumping systems. The algorithm developed here is simple, fast, and has no numerical problems. The solution can be obtained by using available long-term meteorological data for the design-site,and manufacturer data for the system components. The main steps in the algorithm are outlined below: (i) The long-term (16 years, between 1985 and 2001) meteorological database on hourly basis for the design site (Sanliurfa, Turkey), provided in electronic format by the National Meteorology Center, is constructed. (ii) The optimal PV array slope is determined by the linear search method. (iii) The optimal solar radiation interval is determined by the utilizability method. (iv) The optimum number of PV panels and their optimal electrical configuration in the array are determined by a nonlinear search method based on a statistical parameter. The results show that better system performance with less PV array area can be obtained by accurate selection of the array configuration. (C) 2004 Elsevier Ltd. All rights reserved.