Improved Dynamic of Engine Generation Set Using Energy Storage and the Instantaneous Power Theory

This paper presents a comparative evaluation of two different algorithms for an Energy Storage System installed with an Engine Generation Set in an autonomous power supply system. The algorithms presented are intended to improve dynamic of the engine generation set units when a load connects or disconnects from the power supply system. All the algorithms are based on the instantaneous power theory. The main advantage of these algorithms is that they do not require any significant changes or additions to the known control system for a shunt active power filter. In fact, as shown in the article, energy storage system controlled by slightly modified algorithm based on the instantaneous power theory becomes a power system for load transients during load commutations. It is shown, that ESS provides smoother power variation using these additions to the conventional instantaneous power theory as far as active power filtering. Moreover, an ESS still may operate as an active power filter with some limitations concerning load changes. The results presented in paper are verified by simulation models.