Dispatch Of Thermal Units Research Articles

A Sequential Approach with Matrix Framework for Economic Thermal Power Dispatch Problems

The objective of the economic dispatch problem is to schedule the committed generating units output so as to meet the required load demand while satisfying the system equality and inequality constraints. The improvements in the scheduling of generating units can lead to significant cost savings. This paper presents a sequential approach for solving the economic dispatch of thermal units. This is a maiden attempt has been developed to obtain the optimal dispatch solutions for all achievable load demands of a system in single execution. The feasibility of the proposed method is demonstrated for suitable test systems. The generator operational constraints such as ramp rate limits and prohibited operating zones and transmission loss are considered. The simulation results are compared with the recent reports in terms of solution quality. Numerical results indicate an improvement in the cost saving and hence the superiority of the proposed method is also revealed for economic dispatch problems.

Directional Search Genetic Algorithm Applications to Economic Dispatch of Thermal Units

This paper proposes a novel directional search genetic algorithm (DSGA) for solving the Economic Dispatch (ED) problem with fixed boundary conditions. In this paper, a new population generation technique has been employed by using Lambda Limits updation technique. The incremental cost of the generating unit is taken as the decision variable. The feasibility of the proposed method is demonstrated for three different systems, and is compared with various methods available in literature. The proposed algorithm works well for both small- and large-scale generating units and it remarkably reduces the computation time, number of iterations taken to converge, and population size.

Hydrothermal scheduling of a multireservoir power system with stochastic inflows

A suboptimal method for solving the annual hydrothermal scheduling problem for a multireservoir hydrothermal system is presented. Hydrothermal scheduling is performed in order to find the optimum allocation of hydro energy so that the annual operating cost of a mixed hydrothermal system is minimized. In the present work, the hydrothermal scheduling problem is formulated as a constrained optimization problem which is decomposed into three subproblems; maintenance scheduling of thermal units, dispatch of thermal units, and dispatch of hydroplants. The algorithm takes into consideration the stochastic nature of the water inflows to the reservoirs and the forced outage rates of the thermal units. Results obtained by the application of the algorithm to a simplified version of the Hellenic Hydrothermal Power System, showing the effect of the hydroplants, are reported.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>