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Multiphase drives are particularly attractive in medium and high-power applications such as railway and naval propulsion systems. In the most modern drives, a multiphase machine is driven by an IGBT inverter. This paper focuses the theoretical calculation of the power losses in multiphase inverters with an odd number of phases. This analysis could be useful for a preliminary assessment of the drive...
Lightweight power supply systems using soft-switched high frequency dc-dc converter for rolling stock is proposed in this paper. The system consists of hard switched boost chopper, soft switched high frequency inverter, high frequency transformer and rectifier. This system features a boost chopper to control the input current and to set up a controlled DC link. And A soft switched full bridge inverter...
This paper presents analysis of time-ratio-controlled autotransformer as a mitigating device for voltage sag disturbance. Control circuit based on load RMS and voltage sag sensing circuit based on peak detection are employed. Commonly dynamic voltage restorer and STATCOM are employed for mitigation of voltage sag. The proposed system has less number of switching devices in comparison to commonly used...
The converting circuit requires high performance such as the output current with high accuracy, low ripple (les0.2 %) and full-range regulated in power accumulator battery testing system for electric vehicles (EV). In this paper, a three-phase current rectifier (CSR) is taken as the main circuit. Double-loop control strategy which is base on the feedback of grid current and the output current is used,...
IGBT is one of the key components of motor driving system for electric vehicles, and its reliability directly affects the reliability of the electric vehicles. The reliability of the IGBT is affected by the loss and the junction temperature in working condition. To predict the IGBTpsilas loss and thermal response, especially in the case of adverse dynamic conditions, the dynamic loss model and the...
This paper proposes a novel Zero-Current-Switching (ZCS) Pulsewidth Modulation (PWM) switch cell, featuring ZCS of all switches and zero-voltage -switching (ZVS) of all diodes at entire load range.The additional current stress and the conduction loss of the main switch and diodes are minimized. Based on the presented ZCS-PWM switch cell, a novel family of ZCS-PWM converters is derived, which is suitable...
This paper presents a high-efficiency-high power density one stage ZVS-PWM single-ended push-pull (SEPP) high frequency inverter with new PFC functional scheme. This high-frequency resonant series load resonant inverter with lossless snubbing capacitors is composed of a passive PFC converter operating at one diode conducting bridge circuit and asymmetrical ZVS-PWM high frequency resonant direct inverter...
PWM technology has been widely used in motor drive systems today. To avoid the short-circuit condition, dead-time must be inserted to the PWM driving pulses. The addition of dead-time increases the harmonic of output voltage, makes the waveform of winding current more badly. The ripple of motor torque and speed is also increased by the addition of dead-time. The influence of dead-time is more remarkable...
In this paper, a novel power converter for four phase switch reluctance motor was proposed based on double IPMS which has the advantages of high integration and stabilization compared to the traditional power converter circuit. The drive circuit, buffer circuit, protective circuit for the power converter was designed and experimented. Based on TI-DSP2407, the drive system for a 3KW prototype motor...
This paper presents the analysis and loss evaluation of the hard-switching and soft-switching inverters in the three-phase uninterrupted power supply (UPS). Both two-level and three-level hard-switching inverters and the chosen soft-switching inverters are designed to evaluate the loss and the efficiency. Tests of the influence of IGBT collector-emitter paralleled capacitor on IGBT turn-off loss through...
Double modes inverters, as the interface devices between the microgrid system and public grid, plays an important role in the distributed generation system. In order to realize the connection and disconnection between double modes inverter and public grid, an intelligent switch is necessary. The switch is used to detect the status of grid and inverter, adjust the frequency, amplitude and phase of...
There are demands for very large KVA switched reluctance drives (SRD) for many applications. However, one of the key issues is to ensure that the current and voltage capabilities of IGBTs are enough to safely transfer the power from the supply to the SRM. This paper extends the snubber topology of full bridge circuit to the asymmetric bridge circuit of SRDs, proposes and evaluates three different...
Hertzian dipole model and magnetic dipole model based on dipole theory are built for analyzing electromagnetic radiation of VSC-HVDC converter stations in this paper. Transient characteristics of converter valves while switching are analyzed with IGBT1 model. Current through equipment other than valve in converter stations can be extracted by system simulation. Factors that affect electromagnetic...
In order to improve the simulation efficiency, this paper presents a kind of switch-averaged model for the energy storage system to analyze its stability. This energy storage system is applied in metro vehicles that use supercapacitors as the energy storage elements to provide desired management of the power flows. In order to achieve quick response, an effective and simple control method using state...
System integration and high power density of monolithic and multi-chip designs are the driving force for the progress in power electronic systems. The whole system has to be considered and optimized to meet this target and to keep the overall ruggedness, sensitivity towards EMI and long term reliability, Silicon utilization, system reliability and power units miniaturization are the key factors.New...
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