Stevan Grabić

This paper proposes goal-function-based decentralized control of microgrids. In addition to being an instrument for maintaining the grid voltage and frequency stability, each grid-tie inverter generates a current component with the aim of compensating for voltage distortion in the node where it is connected. The designed goal-function does not need to rely on the assumption that a microgrid is dominantly inductive or resistive to derive its control law, as is mostly the case with the droop-based approach. The priorities of the proposed scheme can be adjusted according to user preferences. In addition, the control algorithm is independent of network topology, can be applied in both islanded and non-islanded microgrids, and secure system scalability. The proposed method is verified by detailed simulations.

U radu su izložene osnove metode punjenja olovnih baterija. Prikazan je razvoj prekidačkog simulacionog modela pretvarača na mreži koji kontroliše proces punjenja i pražnjenja. Razvijeni su usrednjeni modeli za praćenje porocesa punjenja/pražnjenja koji su numerički manje zahtevni. Na kraju rada su dati dobijeni odzivi koji su potvrdili verodostojnost simulacionih modela. 

This paper analyses several tools and methods for the comprehensive and efficient development of Power Electronics control systems. Hardware In the Loop technology enhances a possibility for compromising two opposing demands: the requirement for exhausting testing process and a requirement for as short time to market as possible. The procedure was presented through development and testing of one complex control algorithm for the connection of the permanent magnet synchronous generator to the electrical grid. Development steps are explained and analysed in detail. Finally, several scenarios based on presented tools and methods are proposed.