MSc. Goran Drobnjak

In the recent years, electrical networks around the world have more and more energy sources as well as transmission regulation equipment controlled by devices operating on the principle of power electronics. Also, renewable sources are typically in remote regions where a large number of generating units (wind generators or PV generators) are connected by medium-voltage cables that channel the produced energy towards the high-voltage network that is under the control of the system operator. Cable networks combined with inductive network elements always have their own resonant frequencies that change dynamically with changes in the network topology. In some operating conditions, it is possible that undesired interactions might occur between the network and the devices that connect and regulate the currents and voltages at the connections of renewable sources. These interactions are not always easy to understand, especially in cases where there are multiple active control devices connected in mutual electrical proximity. Similar interactions can also occur under different conditions and between different devices in industrial networks.

Keywords: Power converters, power electronics, stability of small signals, interactions, regulation, network resonances