Željko Špoljarić

Small Biogas Plant Stability Prediction Model

In this paper stability prediction for a small biogas plant in islanded mode depending on local consumers energy consumption growth is given. Biogas plant with two cogeneration facilities and local consumers is tested for on grid and islanded operation and thus represents a microgrid. Generator and regulator modelling as well as surrounding electrical grid modelling in software package Power World Simulator are described. Expected consumption growth through the period of 20 years in microgrid area is simulated. All generator important variables, i.e. voltage, frequency, real and reactive power in case of islanded mode are examined and explained. Finally, stability prediction analysis of biogas plant and surrounding consumers for 20 years period is given.

Safety rules for use in electric vehicle charging infrastructure

Development trend in automotive industry is based on development of electric vehicles (EV) and supporting infrastructure. To ensure safety of users and user friendly interfaces, complex systems of power electronics, high voltage and current levels, as well as control systems in real time have priority in research and development. This paper presents an overview of technical solutions and standard procedures related to systems infrastructure for EV power charging, protocols for connections and security systems.