Econo- Environmental Dispatch Solutions for Power Systems Integrated with Renewable Energy Resources

Due to the global initiatives for sustainable energy supply, the electric grids are increasingly integrated with environment-friendly and renewable energy resources. Hence, the power dispatch strategies are to be timely modified by incorporating the environmental aspects of generation along with the economic considerations. In this paper, we propose such an Econo- Environmental dispatch (EED) system for a power grids, which are integrated with renewable energy sources. The EED problem is formulated with two objective functions which aims at minimizing the unit cost of generation as well as minimizing the emissions caused during the power production. For attaining these objectives, cost and emission functions for renewable and non-renewable sources which are integrated with the power grid are developed. The cost functions of the renewables are developed based on the real performance data from a solar and wind farm. While formulating the emission functions, the life cycle emissions are considered. Ramping behaviour of solar PV systems are also considered while optimizing the dispatch solution. The proposed dispatch system is tested on the standard IEEE 30 bus and the optimum solution is derived using Mixed Integer Quadratic Programming (MIQP). The results showed that the optimal solutions for the EED is highly dependent on the unit cost of generation from renewables and the respective weightage factors given for economic and environmental aspects. Different scenarios with varying costs and weightage factors are analysed and presented in this paper.