OPTIMAL OPERATION OF POWER SYSTEM WITH MULTI RESERVOIRS AS APPLIED TO BHAKRA-BEAS SYSTEM

Abstract

Expanding Multi Reservoir Systems are being created to Vi meet increasing demand of water and power. Operation practices and decisions based on judgemental decisions still being follow-ed cannot be optimal. These decisions are also unable to take into account the requirements of interconnections and integrated operations. Optimization techniques are necessary to manage operations of such complex systems. These techniques have been applied to analyse and to improve existing system operations of Bhakra-Beas multireservoir system. Some of the solutions have been accepted by Bhakra.Beas Management Board. Three case oriented studies have been carried out by modelling of the system by development of algorithms, solution techniques and analysis uf rusults for monthly, daily and hourly operations ) Multireservoir medium range study with two objectives for minimizing the deviations from irrigation targets and maximization of power generation for these systems has been done. Multiresorvoir decomposition approach is used for convert-ing the problem into sub problems which are solved by generalis-e d reduced gradient and conjugate gradient techniques. The analysis has resulted into increase in annual average power generation, meeting the scheduled irrigation targets and bring-ing the reservoirs to their full supply level in the end of the study period. It has been suggested that instead of spilling from Pang reservoir water should be drawn from iakra reservoir effecting additional power generation, A new method for unit commitment and scheduling generation in two Bhakra power plants below a c:Allmon dam is developed. This results into optimum releases through each turbine and number of turbines tc be operated for meeting demand at a particular reservoir level. A variety of plant operating constraints has been considered. Discharge minimization has been taken as the objective function solved by non linear and integer programming techniques. Obtained results indicate 0.5 to 2 percent saving in water. Developed unit commitment and generation schedules are being followed by plant operators. Hourly optimization model has been developed or off-line applications for the operation of balancing reservoir and power plant, of newly constructed Beas Satluj Link Project. The objective has been to find hourly release schedules, maximize hourly power generation and meeting system peaks. This would further maximize energy generation in the day and transfer maximum water to Bhakra reservoir for increasing energy genera-tion at Bhakra Power Plants. Compared results with so far field operations are encouraging and still improving the operations. The developed optimization models could permit easy generalization and possible application at other facilities.