Smart Energy Management System for Microgrid Applications in Offices and Homes


Authors : Elukpo, Agnes Obila; Iloh, John Paul Izuchukwu

Volume/Issue : Volume 7 - 2022, Issue 3 - March

Google Scholar : http://bitly.ws/gu88

Scribd : https://bit.ly/3DaEVeB

DOI : https://doi.org/10.5281/zenodo.6385753

The essence of Energy Management (EM) is mainly to optimize the cost of providing energy to end users without compromising the quality of supply, safety of end users and overall system reliability. In most private and public establishments, a huge chunk of total operating cost is dependent on energy cost. There is need therefore, for an efficient energy management system to ensure that an organization’s energy bill is maintained optimal level at all times. This paper presents a Smart Energy Management System for Microgrid Applications (SEMSMA) using three offices in the Department of Electrical/Electronic Engineering, Chukwuemeka Odumegwu Ojukwu University as a case study. The system is designed to distribute power from a 2000W inverter among the offices and also perform real-time simultaneous monitoring of the energy consumption in each of the offices. Each of the three channels/offices is equipped with power measurement function for monitoring the energy consumption for each office. The system is designed to restrict each channel/office to a predefined maximum power allocation (threshold) based on the end user’s request. Loads in the offices are connected to the main power distribution box (DB) through the SEMSMA circuitry. A power calculation algorithm is designed to use the current and voltage samples for continuously determining the amount of power consumed by each office. The calculated power is continuously compared with the predefined threshold and once the threshold is exceeded, the system automatically switches off the affected load/office. A liquid crystal display (LCD) is provided for displaying the status (ON or OFF), instantaneous power in watts (W) and total energy consumption in kilowatt hour (kWh). A ZigBee transceiver module is used for bidirectional communication between the SEMSMA circuitry and a remote computer via a Graphical User Interface (GUI) which provides an ultra low power (ULP) solution for remote operation and monitoring of the system. The system embedded software was developed in Proteus 8.10 simulation environment and implemented with the associated hardware circuitry to produce the physical prototype. The load profiles for the three offices were used to conduct an experiment for evaluating the performance of the system. The results showed that the system functioned with accuracy level of approximately 99.96%. Thus, the system is proven to have the capability to monitor and capture accurate energy consumption data for the offices both numerically and graphically via the LCD and remote GUI respectively.

Keywords : Smart Energy Management, microgrids, Adiuno Uno, current sensor, NRF24L01 and ZigBee

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