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The power converters have been improved with the development of power devices. The development of high-speed switching power devices enhanced the market of voltage source converters in many industrial fields. On-state loss and switching loss of power devices are significantly decreased. Thus, the size of power converters become small and the power converters with less heat generation have little environmental...
Fuji Electric developed a 1200V class RC-IGBT based on our latest thin wafer process. The performance of this RC-IGBT shows the same relationship between conduction loss and switching loss as our 6th generation conventional IGBT and FWD. In addition its trade-off can be optimized for hard switching by lifetime killer. Calculations of the hard switching inverter loss and chip junction temperature (Tj)...
The cascade multilevel inverter can reduce the voltage stress of the power switches and output filter inductance, also it is easy to modularize and some phase voltages are redundant, so it is very suitable for high voltage applications. In this paper a multi-level cascaded DC/AC converter with on single DC power source are presented and a practical modulation are give. The stepping modulation method...
This paper presents findings of a R&D project targeted to the development of a galvanically isolated step-down DC/DC converter for electrolyzer integration with renewable energy systems. The topology proposed is a three-level neutral point clamped half-bridge with a high-frequency isolation transformer and a current doubler rectifier that fulfils all the targets set by the designers. Despite an...
This paper introduced circuit principle and control method of a new type of series-parallel UPS. Through the waveform of output voltage and current, Simulated by Matlab7.0, the results verify that circuit principle and control method are feasible. Also, this paper analyzes the circuit can reduce the switching losses and improve the efficiency of the superiority of the machine in case of mains power...
In this paper, the application of space vector pulse width modulation (SVPWM) technique is proposed for a two-phase full bridge voltage source inverter (VSI) having reduced number of switches. For the switching sequence, only symmetric SVPWM is considered in order to minimize the harmonic contents of the output current. By using software, three level switching patterns are determined for the six power...
This paper presents the nine level cascaded H-bridge multilevel inverter based on a multilevel DC link (MLDCL) and a bridge inverter to reduce the number of switches. An MLDCL can be a diode-clamped phase leg, a flying-capacitor phase leg, or cascaded half-bridge cells with each cell having its own DC source. Compared to diode clamped & flying capacitor type MLDCL inverters cascaded H-bridge multilevel...
This paper presents a novel dead-time elimination method for operating nine-switch converter. The proposed method assumes unique switching cells of nine-switch converter to operate under several subintervals during a fundamental period. Due to the unidirectional conduction characteristics of switching cell, the nine-switch converter can operate without dead-time protection. For a special subinterval...
This paper presents a new ZVS-PWM reduced-switch three-phase inverter that can work bidirectionally for applications where energy storage or energy harvesting is involved. Switching losses are reduced due to a simple auxiliary circuit that provides ZVS condition for all the switches, including the auxiliary switches. The auxiliary switches are used for only a small fraction of every switching cycle...
A generalized terminal model has been proposed to predict the conducted electromagnetic interference (EMI) from a boost converter. The results of conducted emissions have shown a good agreement up to 50 MHz. The same technique was also successfully applied to extract a terminal model of buck converter. This paper extends the generalized terminal modeling approach to a larger class of power converters...
Single-phase stand-alone PV system is suitable for household applications in remote area. Hybrid battery/ultra-capacitor energy storage can reduce charge and discharge cycles and avoid deep discharges of battery. This paper proposes a compact seven switches structure for stand-alone PV system, which otherwise needs nine switches configuration, inclusive of one switch for boost converter, four switches...
Assuring continuity operating of induction machine drives is crucial in the most of applications. Thanks to the number of their output voltages, and the extra degrees of freedom they offer, multilevel inverters have been adopted in many applications. In this paper, a new fault tolerant SVM strategy for induction machine drives based on a 3 level NPC inverter is proposed. It insures a continuous operation...
Matrix electric power conversion topologies and their switch functions are flexible, as can be used to derive other electric power conversion topologies and switch functions for specific applications. This paper presents the Single Phase Matrix Converter (SPMC) topology that will operate as rectifier, inverter, buck converter, boost converter, chopper and cycloconverter. The circuit composed from...
In this paper, a design and implementation of a digital signal controller (DSC) for high frequency-based grid-tie inverter connected to wind emulator system is designed, fabricated, and tested. A 150 MHz (6.67-ns Cycle Time) Texas Instruments TMS320F28335 processor chip is used as the heart of the developed control board. DSC based board is a highly integrated, high-performance solution for demanding...
The evolution of power device technology and the development of large integrated circuits in the recent years have paved the way for the modern fast switching Pulse width modulated (PWM) technique for DC-AC power conversion. One of the standard PWM techniques is the space-vector-modulation(SVM) technique utilized for DC-AC power conversion, the solutions to have harmonic free mitigation in high power...
Traditional EDM power supplies convert the energy at low frequency, directly from the utility line and they are able to deal with a wide spectrum of output power. The EDM power supply must achieve high voltage to generate the spark and large current to maintain the ion column. To achieve this, large and heavy transformers and inductances are required. Resonant converters are desirable for power conversion...
This paper presents a three-phase, five-level cascaded multilevel voltage source inverter based active filter for power line conditioning to improve power quality in the distribution network. The active filter compensates both reactive power and harmonic currents drawn by non-linear loads; additionally it facilitates power factor corrections. The compensation process is based on concept of p-q theory...
The control circuit of the active power filter used for power quality improvement has several basic functional blocks, out of which the reference current generator and the switching pulses generator are considered as most important blocks. This paper presents a novel switching technique for three phase four wire shunt active power filter. The switching pulses are derived by using the three dimensional...
This paper presents a new control strategy for real and reactive power control of three-level multipulse voltage source converter based High Voltage DC (HVDC) transmission system operating at Fundamental Frequency Switching (FFS). A three-level voltage source converter replaces the conventional two-level VSC and it is designed for the real and reactive power control is all four quadrants operation...
Pulse width-modulated (PWM) inverters are used more and more to operate electrical machines and to interface renewable energy systems with the utility grid. However, there are abundant high-frequency harmonics in the output voltage of a PWM inverter, which increase the iron losses and result in derating of the machine or transformer connected to them. Predicting the iron losses caused by the PWM supply...
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