Energy management system using dual-layer approach for residential micro-grid system under fixed load condition

Abstract

This paper proposes a dual-layer coordination of energy management system (EMS) in stand-alone mode micro-grid (MG) system that considering demand response (DR) scheme in the means to reduce electricity cost at power and demand side. The main advantage of this method is that the coordination between power side and demand side can be balanced. While ensuring that operations at power side is economically controlled, the satisfaction of load demands can also be achieved. In this work, two strategies have been implemented, load shifting process based on pricing strategy as well as micro sources scheduling strategy. The performance of proposed approach has been tested based on the fixed load conditions. For the first layer EMS, the goal is set to reduce the electricity bill through load shifting process. In this EMS, five different selective modes of operation were considered during load shifting strategy implementation. In the second layer, the load profile from 20 houses has been used as the input data and aim has been paid to ensure the MG operates economically while ensuring a continuous electricity supply to the demand sides. For the economical consideration, the operation and maintenance (O&M) cost of MG also included. From the executed simulation, it has been found that from the first layer strategy, the maximum cost saving of electricity bill that able to be achieved is around 2.71%. In the second layer EMS however, the cost of O&M saving for fixed load condition is around 1.92%.