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Phase-shifting reactor (PSR) can be used to solve the harmonic problems caused by rectifiers. In this paper, according to the active power balance principle, the relationships among DC current of load, currents of power supply side, as well as capacity of core limb are built, and the design specifications of winding and core are obtained. simulation of 6-phase rectifier system with PSR by the equivalent...
This paper presents a study of a processes in the three-port converter under different modes of operations. Circuit topology provides a compact size of the device, allows to get zero pause and decrease losses. The modeling reflects the experimental results.
Utility power distribution system analysis has traditionally been performed considering only the primary, or medium-voltage (MV), system. Distributed energy resources are increasingly being located on the secondary, or low-voltage, side of the distribution transformer, requiring the low-voltage system to be included in the analysis. However, most distribution system models do not include secondary...
This paper introduces a new dual redundant permanent magnet synchronous motor, establishes its mathematical model and designs its speed control and current sharing control system. Dual-redundancy permanent magnet synchronous motor (DRPMSM) finite element model was established in the Ansoft, the SVPWM control system model with id∗=0 control strategy was built in Simulink and field-circuit coupling...
The continuously variable series reactor (CVSR) is a series line reactor designed for power flow control in meshed power system networks. The CVSR is controllable using a variable dc source which establishes the magnetization of the ferromagnetic core and enables continuous modulation of the line reactance. Synthesizing a model that describes operation of the CVSR in ac networks presents challenges...
This paper proposes a practical connection approach for distribution static synchronous compensator (DSTATCOM). DSTATCOM is connected to the system through a center-tapped distribution transformer for reactive power compensation. The voltage stress is reduced by half and the number of the cascaded cells is decreased. The mathematical model of the system is established referring to the autotransformer...
This paper presents mechanisms of the voltage spike and the diode freewheel phenomenon caused by the diode reverse recovery in the commutation of doubly salient brushless DC generator (DSBLDCG). An analytical solution for the voltage spike is derived on the basis of a simplified model of the diode reverse recovery. Some factors that influence the spike size, such as the rotating speed, field current...
This paper concerns to modelling components of the half-bridge converter. The electrothermal models of the impulse-transformer and semiconductor devices, being the essential components of dc-dc converters, are presented. The converters with transformers containing in turn powder cores, ferrite cores and nanocrystalline cores are examined. The results of measurements of this circuit and the results...
A method for demand side voltage control, using a three winding smart transformer is investigated. The concept is to control the secondary side voltage of the transformer by injecting a voltage to the tertiary winding. This paper presents a design methodology for the proposed transformer, as well as for the controlling scheme, and validates the concept through simulation and hardware implementation...
This paper presents an experimental study of an Inductively Coupled Power Transfer (ICPT) system using a full bridge converter operating at variable frequency. Equivalent circuit model for ICPT systems are used to represent the total impedance seen by the power supply, by combining the primary and secondary network is detailed. A variable switching frequency controller is used to control the switching...
This paper examines the influence of metal plates to reduce the leakage electro-magnetic field on WPT using longitudinal winding coils with direct or indirect feeding.
In the recent years there has been excessive use of nonlinear loads in power distribution network resulting in the injection of harmonics into the utility power system. The triplen harmonics due to non-linear loads circulate in the conventional delta-star distribution transformer resulting in excessive power losses. Star-star-delta_utilized transformer is a modified distribution transformer configuration...
In this paper, a system of coupled and interacting models for dynamic electric and thermal behavior of an electrical machine is presented. The models are specifically designed for maximum execution speed and are suitable for simulating the machine behavior over long time periods and even the entire lifetime of the machine. Nevertheless, the results proved to be remarkably accurate. Arbitrary electrical...
This paper deals with a three-phase power system with hybrid transformer (HT). The HT contains a conventional transformer with electromagnetic coupling and PWM AC line chopper integrated with the secondary windings through an electric coupling. The HT uses a three-phase Yy connected transformer with additional secondary windings and three-phase PWM AC line chopper with buck-boost topology. The paper...
This paper deals with three-phase power system with hybrid transformer (HT). The HT contains conventional transformer with electromagnetic coupling and PWM AC line chopper integrated with secondary windings with electric coupling. The HT is located between distribution system and Local Balancing Area (LBA) with small power local energy sources. After description of the three-phase power system with...
This paper describes an online winding reconfiguration method to output the constant torque of MATRIX motor. MATRIX motor can change its winding configuration by multi-layer winding and switching devices. We have realized that the motor can change the motor characteristics, for example, the excitation of a quasi-distributed winding by using the concentrated winding. The winding switchover, however,...
Shorted compensating windings or non-uniform conductive shield can be used in a selectively passive compulsator to compensate the field produced by the armature winding, thus to reduce the impedance and increase the amplitude of the output current. The compensating effect on the inductance of the armature winding changes while the rotor rotates, so it is possible for selective compensation to output...
This paper processes simulate analysis of short-circuit test model of transformer, using finite element analysis software ANSYS. The winding and disk deformation is calculated in different elastic modulus value of strip; The model is calculated and analyzed in the load of short-circuit test, the maximum deformation 2.62 mm of disk obtained is mainly consistent with actual measured value 2.9 mm; Analysis...
Pulse Step Modulation based High voltage power supply has played significant role in fusion research. Multi-Secondary transformers are invariably used for generation of tens of kV range outputs with fast (µS order) transient response. In this scheme, large numbers of isolated voltage sources are connected in series to generate the output. Isolated voltage sources can be achieved by large number of...
Nuclear power plants have Normal and Emergency power supply systems. Both the power supply systems are to be reliable for safe operation of the plant. Prototype Fast Breeder Reactor (PFBR) coming up at Kalpakkam is a single unit 500 MWe project. The normal power supply system consists of two Station Buses and two Unit Buses. The station buses are fed from grid through a Station Transformer (ST). The...
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