Paper presents a three-phase current-based model of FACTS devices for power flow calculation with Newton-Raphson method. First, it presents the basic method of three-phase current-based modelling of FACTS devices, together with existing three-phase model of FACTS devices and the type of FACTS devices. Next, determinations of controlled parameters depending on the type and usage of FACTS devices are presented. At the end numerical examples in the IEEE 300 bus system are presented. The problem of initial values is exposed and superiority of the new method by comparison with the existing ones.
COBISS.SI-ID: 9428820
In this paper the authors developed a novel regulation scheme in order for wind turbines to participate in primary frequency control. This improves power system reliability and enables the participation of wind farms in the ancillary service market
COBISS.SI-ID: 8910420
In this paper a procedure for improving the operation of adaptive underfrequency load shedding schemes is presented as well as theoretical background for its explanation. Despite knowing active power deficit estimation, that caused rapid frequency decay, it is possible to usefully apply monitored first system frequency derivative in order to improve the amount of disconnected load and also power system frequency response. The presented procedure has been appropriately tested.
COBISS.SI-ID: 7855188
Voltage fluctuations in transmission networks caused by the operations of large consumers, for example, electric arc furnaces, are often the primary sources of high levels of flicker at the end-users. This article compares two methods for simulating the flicker propagation in a meshed high voltage network by comparing simulated levels of flicker with levels obtained from field measurements. The comparison of the simulated and measured flicker values was extended to include two different network schemes and provides a further insight into the nature of flicker propagation in power networks.
COBISS.SI-ID: 7834196
The calculation of flicker propagation is vital in assessing power quality levels throughout the network. As an alternative to the established stationary flicker propagation methods, this paper introduces representative voltage samples. The shorter 1-s voltage samples are extracted from the instantaneous voltages measured and can represent the longer operating periods of an arc furnace. Additionally, the flicker levels in nodes under the influence of flicker from multiple arc furnaces can be obtained without the use of superposition factors.
COBISS.SI-ID: 35976965