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Due to the increase of the train velocity, the pantograph-catenary arc occurs even more frequently, which results in severe erosion on the pantograph pan and the catenary wire. This leads to a serious threat to the normal operation of the pantograph-catenary system. As the level of the arc erosion has a close relationship with its energy, it is necessary to study the influencing factors and suppression...
This paper presents a design methodology of a synchronous reluctance motor (SynRM) based on the equivalent electrical parameters model. The parameters of the model are calculated using FEM 2D simulations and corroborated with experimental results. In addition, the experimental test procedure applied to the prototype is presented.
In this paper a 2 MW dc-dc converter is presented and design criteria are carried out. It deals with the preliminary design for the hardware implementation. The power supply shall have multiple targets such as an PV emulator or supply for a dc-micro grid in the research facility National Center for Reliable Electric Power Transmission of the University of Arkansas. The converter is designed for an...
Z-Source inverters can overcome some of the limitations, inherent in traditional Voltage Source and Current Source Inverters and can provide boosted outputs. Most of the literature on Z-source inverters deals with 3-phase or 1-phase bridge inverters. This paper proposes a Single-Phase Z-Source Push-Pull Inverter topology. This scheme has several advantages compared to basic Z-source full-bridge inverter...
Low temperature cofired ceramic (LTCC) is an effective method to realize the miniaturization, high reliability and low cost for microwave and high-frequency devices. In the paper, a miniaturized 3 dB LTCC coupler using lumped elements is proposed based on the even-odd decomposition method for the built of image-reject mixer (IRM) in receiver systems. With a novel and compact structure, the coupler...
The paper studies the method of the physical processes research versus presented equivalent circuit of the electromagnetic drive of the vacuum switch. The problem of the difficult configuration system magnetic field calculation with the subsequent calculation of inductance is considered. Discrete values of inductance with spline approximation were transformed to the continuous values. Calculation...
This paper explores the feasibility of transient simulations power system based on discrete event system (DEVS), where the Quantized State System (QSS) algorithm is used for numerical integrations. An induction machine model based on DEVS formalism is built up. Moreover, to guarantee the efficiency and accuracy of transient simulations based on QSS, an algorithm for optimal selection of quantum is...
To cope with power from large-scale renewable systems, more and more power electronic converters are used in parallel. Typically, carrier interleaving is used, thus leading to a decrease in filtering requirements. However, this causes additional circulating current to flow between the modules of the converter. The modules of the parallel converters are Voltage Source Converters (VSC). Usually, a coupled...
This paper presents a design methodology for a first order L filter inductance used to connect a three-phase power converter to the grid. This method uses the desired THDi to calculate the L filter inductance to ensure the grid-connection standards are met. This methodology was designed for converters operating with Space Vector PWM modulation.
This paper deal with the development of frequency selective surfaces (FSS) structure with tunable bandpass characteristic. The primary resonant frequency of FSS is 2.4GHz which is suitable for wireless communication system. Basic principle of tunable FSS is the ability to tune the resonant frequency by varying the reactance value of the unit cell circuit. It can be accomplished by using solid-states...
To solve the velocity-measurement difficult problem of linear motor in high speed and high acceleration occasions, a velocity-measurement method based on teeth-slots signals detection is proposed in this paper. In this method, the speed signal is obtained from the inductance periodic variation of probe coil, and the "teeth-slots" bar consisting of conductor and ferromagnetic materials alternating...
This paper proposes a new approach to achieve on-line identification of the q-axis inductance and the resistance of the interior permanent magnet synchronous motor (IPMSM) on the basis of the relationship between the mismatch of Lq and the d-axis feedback current. The value of the d-axis feedback current depends on the mismatch of Lq, and the consecutive samplings of the d-axis feedback current make...
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...
The paper analyses the influence of induction machine (IM) design on rotor slotting harmonics used for sensorless control strategies. These harmonics have a direct impact on flux and rotor position estimation accuracy. Therefore prediction of their magnitude helps in selecting suitable machine designs with regard to stator/rotor slotting and winding configuration. The paper at hand focuses on the...
This paper provides analysis result about effects of parameter variation on mono inverter dual parallel (MIDP) surface mounted permanent magnet synchronous machine (SPMSM) drive system. Parameter variation is natural phenomenon in real system and is caused by manufacturing tolerance, temperature variation, and magnetic saturation. In the MIDP motor drive system, parameter error can be occurs not only...
Normally, a two stage power conversion system is used to convert a low dc voltage to high amplitude ac voltage. These two stage power conversion systems are very bulky, more complex in control and less efficient, etc when they are used, especially for low input dc voltages. In this paper a high gain dc-ac inverter topology is presented, which can produce an instantaneous output voltage higher or lower...
In this paper, a long flux-path winding connection (SSNN) mode of SRM is presented. SSNN mode can reduce the mutual inductance between conducting phases, and thus realize the decoupling between each phase. Based on a six-phase 12/10 SRM, extensive finite element analysis simulation results demonstrate the effectiveness of the proposed winding connection.
The Pulserad electron beam accelerator at the University of New Mexico (UNM) was refurbished and reconfigured to provide a voltage pulse with a very fast risetime, inspired by simulation results that indicated that the magnetron output characteristic was very sensitive to the voltage risetime. The modified Pulserad has a 2 ns risetime after which it maintains a flat-top for 30 ns and is capable of...
Measuring the position of a moving or rotating target is one of the basic tasks for position control applications. Especially in the area of magnetic bearings, this plays a crucial role for stable levitation. Hence, the demand on reliable and affordable position sensor systems is high. Thereby, the sensor should feature high dynamics, a high resolution and low noise. State of the art systems are typically...
Among the on-chip current sensing techniques, inductor current sensing method is the most feasible one for high switching frequency converter, which aids reduction of the filter inductor size. This paper presents a reduction of area design for the combined AC and DC inductor current sensor with load transient enhancement for the systems-on-chip applications. The proposed current sensor is simulated...
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