An event-driven building energy management system enabling active demand side management

Effective Building Energy Management Systems (BEMS) are essential for future smart grids with implemented demand-response concept. Building Automation and Control Systems (BACS) can gather information about power and energy consumption as well as control loads in buildings and dynamically interact with the smart grid. A demand value is crucial in organizing this kind of the BEMS with an active demand side management (DSM). In this paper we propose different approaches to calculate this demand value using time-driven and event-driven mechanisms characteristic for the BACS. These approaches have been implemented. Experiment with real data has been performed to verify this implementation. Results of experiment show that various demand value computing methods could provide different information about demand level from the active DSM point of view. These approaches have been analysed with respect to the accuracy and speed of computing the demand value. Pros and cons predisposing them to various applications has been found and presented for both the time-driven and even-driven mechanisms.