SOFTWARE MODULES FOR MINI HYDRO DESIGN

Country: India State:  Capacity:  MW
Year:  Client: Joint UNDP/ESMAP  Energy:  GWh

The assignment (covering 55 projects in South India) was initially handled by A.S.Chelvaraj (hydropower expert) and A.C.Sivaguru  for 3 years (1989-1992). It involved review of the design and economics of 55 mini hydropower  prospects to be developed at existing irrigation dams and canals in states of Andhra Pradesh, Karnataka, Tamilnadu, Kerala and Punjab with a total potential of 131MW and 600GWh. Techno economic concepts  were applied to improve and standardize the electromechanical and civil works designs and layout proposed  by SEBs to minimize investment requirements and thereby enhance the economic merits of the prospective schemes. The scope also included economic / financial evaluation and development of a comprehensive pre-investment report with case studies on seven schemes entitled India -Mini Hydro Development on Irrigation Dams and Canal drops for consideration by International Financial Institutions.

The report also addressed various policy issues like opening up implementation to private sector, establishment of mini hydro cells and cost centres within SEBs for investigating new schemes and demonstrating the economic viability and return on equity for private investors.

The findings and recommendations were accepted by The Government of India. The World Bank, on the basis of guidelines recommended by this study, released an amount of USD 142 Million to Government of India for implementation. Most of the 55 projects have been implemented by IPPs and SEBs.
SECSD in 1995 were entrusted to review/revise the above study and develop a series of interrelated software modules for Computer Aided Design of Mini Hydro projects. The firm successfully completed the assignment and delivered the software with requisite hardware for demonstration.

DESCRIPTION OF MODULES

The modules with their functional description and utility are given below. The software is suitable for running on IBM PC compatible and has an interface with AutoCAD for the generation of drawings and layouts.

HYDROLOGY: Creating computerized Database of the daily flow for a system of irrigation dams and canals with summary, flow duration curve and evaluation of energy curve for a given gross head.

HYDRAULIC: Computes net head from Head duration curve, tailwater rating curve and water conductor system losses.

ICAPACITY: Determines the optimum unit capacity, the number of units and energy generated by each unit.

EMSELECT: Selects the turbine with least runner diameter from a database of standardized capacities (350, 650, 1000, 1250, 1500, 2000 and 3000kW) covering a wide range of equipment from various countries  like straight flow tubular, right angle drive, siphon, open flume, bulb, pit turbine, vertical Kaplan,  upstream elbow, downstream elbow etc.  Also selects generator type, speed, gearbox ratio and evaluates unit dimensions.

LAYOUT: Produces layout of power house, dimensions of power and tailrace canals/conduits.

GRIDTIE: Selects standardized single line diagram with protection and metering scheme. Grid Tie design with conductor details and evaluates the performance and energy losses.

QUANTITY: Computes quantities and cost of civil works with rate analysis as input. Electromechanical equipment and grid tie cost is calculated from a database of budgetary costs.

ECOFIN: Performs Economic analysis by comparing with a diesel set of equivalent capacity with Life Cycle costing. Also calculates, Unit Benefit cost ratios, Energy productivity per unit investment and Cost of generation. Financial analysis and Cash flow is evaluated for various loan terms / conditions and Sensitivity analysis for range of variation in parameters such as interest rate, equipment cost, civil costs, loan period, energy cost, inflation rate etc.

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