Research of Grounding Systems of Electrical Complexes in the Conditions of Permafrost Soils

The assesement of the shunt active filter efficiency under varied power supply source and load parameters

“…According to the mentioned trends, for active converters and filters to be presented as parts of an electrical complex of a power source, as elements of a distribution network (e.g., UPFC) [12], and as parts of a connected load, it is necessary to have unified theoretical and methodical propositions for the development and application of such converters and filters under different conditions. Also, we cannot ignore the fact that the centralized and distributed power supply systems possess different parameters and characteristics which must be taken into account in the selection of structures, key parameters, and control algorithms of active converters, active, passive, and hybrid filters, and their applications [33,34]. That is why it is necessary to research the behavior of active and hybrid filters under varied conditions of internal impedance of the power source when we need to change the power supply mode from centralized to distributed and vice versa in emergency cases in combined power supply systems.…”

“…The indicated control ways have some limitations and assumptions. According to the results from experimental studies and computer simulations [25,34,35] control ways #2 and #4 demonstrate the maximum efficiency level under conditions of traditional centralized power supply systems with little value placed on internal impedance and short-circuit power. Control way #3 can effectively eliminate harmonics under a constant current level, which is consumed by the connected non-linear load.…”

“…The first stage is the selection of character control ways from all plenty of the existing methods and theories for the further research. According to the results of numerous theoretical and experimental studies [7,8,[21][22][23][24][25][26], the ways developed for the determination and correction of power quality indicators for shunt active filter control may be divided into three main groups [27][28][29][30]:  Ways based on discrete (DFT) and fast Fourier (FFT) transformations [31][32][33][34][35].  Ways that extract the reference values of current or voltage using the theories and methods of current physical components (CPC) [22,23,36].…”

“…All of the mentioned ways have been described, studied, and proved [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] under special power source and connected load conditions, but there are no results on the comparative analysis of the efficiency levels of these ways under different power source and connected load conditions. The potential results of such analysis are determination of the main stage of the theory of structural and parametric synthesis of electrical complexes for power quality improvement on the basis of active and passive filters.…”

“…Also, this model contains the shunt active filter with different control ways. For simulation purposes, the following widespread ways for shunt active filters control, which have been proven for application, were selected [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]:  A way based on the p-q theory with a special regulator of the voltage of the storage capacitor (way #1).  A way based on the phase transformations in the reference framework αβ (way #2).…”