Dynamic Economic Dispatch Considering Transmission Losses Using Quadratically Constrained Quadratic Program Method

In response to the challenges brought on by the energy conservation based generation dispatch (ECGD) in China, a dynamic economic dispatch model that considers transmission losses (DED-TL) and a new solution framework are proposed to improve the accuracy, efficiency, and robustness of generation scheduling. Transmission losses are presented explicitly in the model so that the total energy consumption, consisting of both the generators´ operation costs and also the transmission losses, can be well considered. The model is formulated as a quadratically constrained quadratic program (QCQP) problem that can be solved by commercial solvers. A penalty-based algorithm is proposed to address the virtual transmission loss problem brought on by negative nodal marginal costs. Three cases-a 6-bus system, the IEEE 30-bus system, and a 2746-bus system based on the electric energy system of Poland-are employed in numerical experiments to demonstrate the effectiveness of the proposed method. The results show that the better scheduling results in higher accuracy, and that good computational efficiency can be acquired via the proposed method.