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Electrical equipment like motion detectors, time switches, presence sensors, timers, low power LED lamps or LED night lights have real power less than 1 Watt at the AC grid 230V/50Hz. But if we analyze the circuit topology, there are many conventional resistors to limit the inrush current. With an inrush controller with switched transistor we can eliminate the resistors and improve the efficiency.
Vehicle electrification has become an important measure for greenhouse gas reduction in many countries worldwide. Regardless of what type of electric vehicles (EVs), the on-board battery must be charged via a charger or charging station. In the future, when large numbers of EV chargers or charging stations are connected to distribution systems, there will be a degree of influence on the system operation...
The main source of voltage signals used for distance relays are capacitive voltage transformers (CVTs). During line faults CVTs generate transients that influence voltage signals. During the transient period it is difficult to distinguish if the fault occurred within the operating zone or outside the protected line, which might lead to a maloperation and in the worst case, a system blackout. In this...
Energy generation evolves quickly towards a significant share of renewable sources, with increased challenges regarding the system stability and provision of ancillary services, including the non-mandatory voltage control (NMVC) by generators. Under these circumstances, accurate measurement solutions are required to support competition and increase the quality of such services. Current measurement...
This paper presents a new methodology to solve for the state estimation problem in radial distribution networks. The state estimation process is formulated as a constrained optimization problem in which the non-monitored loads are represented by a set of bounded inequality constraints. The branch currents in rectangular coordinates are chosen as state variables. The set of measurements considered...
This paper presents a cooperating converter that interfaces a Low-Voltage Energy Storage System with the electrical grid. In this paper, Low-Voltage is consider a voltage that is much lower than the minimum DC voltage required for controlling properly the current of the grid connected inverter. Energy Storage Systems operating at Low-Voltage usually require in conventional applications the inclusion...
In the paper the novel approach to application of the power electronic converters used as a part of shore-to-ship supply arrangement has been presented. Simulation results have confirmed possibility of using control of shore-side converter of shore-to-ship system for synchronizing with ship's voltage and load transferring by parallel work instead of using short blackout or synchronization of ship...
This paper deals with the diagnosis of the electrical faults of induction motor operating under the direct field-oriented control. Two different faults are taken into account: stator winding inter-turn short circuit and voltage source inverter transistor damage. The fault diagnostic algorithms are described. Performance of both algorithms is validated in presence of the different kind of damages....
The paper presents the control system and selected results of experimental tests of the ac/dc power converter consisting of 18-pulse diode rectifier on the basis of coupled reactors and a serial active power filter. Three configurations of the 150kVA converter were tested experimentally and compared: 18-pulse diode rectifier with and without additional grid reactor and the rectifier integrated with...
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