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Power electronics converter systems (PECS) are significant corner stones in enormous variety of industrial applications, including smart grids and variable speed drives. One of the factors that assist to improve such systems is the study of their fault mode behaviors. Besides that, the open circuit (O-C) faults in the PECS do not trigger the standard protection systems in the converter but rather...
This paper presents a new adjustable speed drive (ASD) topology that employs medium frequency (MF) transformer isolation. The proposed system consists of a new 3-phase push-pull based AC to DC rectifier with a MF AC link employing only two active switches. A single 5-limb multi-winding MF transformer is employed for isolation. The secondary side of the transformer is connected in a zig-zag configuration...
Common-mode current generated by the PWM AC drive at low modulation index and higher switching frequency results in overheating of the pre-charge resistor of the SCR based rectifier. In this paper, two modifications are proposed for the operation of SCR based rectifiers to significantly reduce the resistor overheating issue. The solution is cost and size effective when compared with alternative solutions...
In order to develop and validate smart grid technologies with complex control and communication, detailed modeling of distribution systems using the Real Time Digital Simulator (RTDS) is invaluable [1]. At the distribution system level, testing a 13 kV power electronic device without first validating its controls is cost prohibitive. RTDS provides a cost effective way to study smart grids at not only...
This paper presents a new wireless power transfer topology for electric vehicle (EV) charging application. The main emphasis is given on high frequency DC-AC and AC-DC wireless power transfer stage where the inversion stage is current fed topology. The required resonance in transmitter side is C-C-L type and in the receiver side series L-C type. Inductor in dc-link provides short circuit protection...
In this paper a novel DC line-interactive uninterruptable power supply (UPS) with load leveling feature is proposed. The new UPS replaces the common AC three phase UPS and can be used for systems with pulse loads, and has superiority in performance and efficiency. The DC UPS utilizes Li-ion battery module in the DC link to perform the load leveling feature and UPS functionality. A Li-ion LFP based...
Generated harmonic current as a consequence of employing power electronics converter is known as an important power quality issue in distribution networks. From industry point of view complying with international standards is mandatory, however cost and efficiency are two other important features, which need to be considered in order to be competitive in the market. Therefore, having a flexibility...
This paper introduces a new isolated resonant dc-dc converter topology based on the recently proposed impedance control network (ICN) converter architecture. This new converter maintains very high efficiency by achieving zero voltage switching (ZVS) and near zero current switching (ZCS) across a very wide operating range. Additional performance enhancement is achieved through a new design methodology...
This paper presents the analysis and the validation of the large signals model of a new five-level T-type unidirectional three-phase rectifier topology known as 5L T-RECT. Proposed modeling approach is mainly based on the well-known state-space averaging technique. Accordingly, to this technique, the averaging process is applied across one PWM sampling period TS, thus resulting in the basic 5L T-RECT...
In this paper, a novel three-phase matrix based isolated AC-DC converter is proposed for DC distribution system. The circuit is derived from boost converter based matrix PWM rectifier by only adding a small commutation capacitor and inductor. Compare to traditional power factor correction rectifier plus DC/DC two-stage configuration, the proposed converter has higher efficiency and power density....
This paper proposes a novel modulation method of the full bridge three-level LLC resonant converter. The voltage gain of the converter is analyzed by First Harmonic Approximation technique using this modulation method. Therefore designers can easily calculate the converter parameters. A 385V input, 225 to 378V/6.6kW output prototype converter shows 98.14% peak efficiency.
Diode rectifier front ends with large DC bus capacitors used in Variable Frequency Drives (VFDs) draw discontinuous current from the power system resulting in poor input power factor and high input current distortion. In case of single-phase AC to DC rectifiers, the single-phase boost converter is popular and effective in improving the input power factor and reducing the input current harmonics. However,...
In the basic zero-voltage-switching (ZVS) full-bridge (FB) converter, the output rectifier diodes suffer from hard-switching, results in severe voltage spike and oscillation across the output rectifier diodes. In this paper, a fundamental approach is proposed to tackle this issue, indicating that clamping the voltage across the winding of the power transformer could eliminate the voltage oscillation...
This paper presents an unidirectional single-phase to three-phase AC-DC-AC converter. The single-phase converter is composed of two parallel single-phase rectifiers with an uncontrolled shared-leg. Suitable modelling, including the circulation current, and control strategy are developed. A comparison between sinusoidal PWM (with and without interleaved technique) and the 1-D (unidimensional) control...
A new compound-excited doubly salient brushless dc (DSBLDC) generator with power tracking rectification is proposed, which is constituted by a doubly salient electromagnetic machine (DSEM) with split field windings and a simple switched-mode rectifier. The configuration and operation principle are introduced. The inductance features of the generator are analyzed for the utilization of series field...
In this paper, we introduce a step-down resonant dc-dc converter architecture based on the newly-proposed concept of an Impedance Control Network (ICN). The ICN architecture is designed to provide zero-voltage and near-zero-current switching of the power devices, and the proposed approach further uses inverter stacking techniques to reduce the voltages of individual devices. The proposed architecture...
Wide band-gap materials such as Gallium Nitride (GaN) and Silicon Carbide (SiC) offer improved performance for power electronic devices compared to traditional Silicon (Si) power semiconductor devices. This paper investigates a 600V GaN & Silicon CoolMOS transistor application in 400W single phase continuous conduction mode (CCM) Boost PFC converter circuits with GaN, SiC and ultrafast silicon...
This paper discusses a circuit configuration for a single-phase current source inverter that features power decoupling capability. This converter consists of a resonant type isolated DC/DC converter, power decoupling circuit, and a current source inverter (CSI). The proposed converter can be achieved the low input voltage ripple without a large smoothing inductor or electrolytic capacitor. In this...
For low output voltage application, a half-bridge LLC resonant converter family with synchronous rectifier (SR) that has a boost pulse width modulation (PWM) converter characteristic for hold-up state operation is proposed in this paper. In proposed converters, an auxiliary switch (or an auxiliary switch and a diode) is added at the primary side to provide the charging branch for series resonant inductor...
Main goal of this paper is to investigate the fault-tolerant operation of an Active Neutral Point Clamped (ANPC) rectifier. Fault detection and faulty switch identification methods are indicated in case of open-circuit and short-circuit failures. From this knowledge, a reconfiguration scheme can be provided allowing for the system to continue operating without need of a non-programmed stop. Different...
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