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The control performances of the hybrid PWM inverter according to the phase current measuring method is presented in this paper. The hybrid PWM strategy consists of space vector pulse width modulation (SVPWM) and 6-step modulation. SVPWM is performed to reduce the harmonic components in the low speed region, and 6-step modulation is applied to increase the maximum speed of the IPMSM in the high speed...
The Pohang Accelerator Laboratory (PAL) had started the 10 GeV PAL-XFEL project from 2011. The PAL-XFEL needs a highly stable electron beam. The very stable beam voltage of a klystron- modulator is essential to provide the stable acceleration field for an electron beam. Thus, the modulator system for the XFEL requires less than 50 ppm PFN voltage stability. To get this high stability on the modulator...
This paper presents improved Rubber Tyred Gantry Crane system with high power voltage compensated converter to save the fuel consumption. The RTGC system requires the power from diesel-engine. Significant fuel savings by reducing the engine speed can be achieved, because all of operation modes except hoisting are required lower power than rated value of engine. When low speed operation output voltage...
This paper proposes a grid-tied power conditioning system for the fuel cell, which consists of a three-phase current-fed dc-dc converter and a 3-phase inverter. The three-phase current-fed dc-dc converter boosts the fuel cell voltage of 26-48V up to 400V, using the zero voltage switching and three-phase DC power transfer capability. The operation of proposed power conditioning system was verified...
High integration of power electronic systems require optimised packages. This paper presents an innovative, fully-molded intelligent power module for small power three phase drives in a dual-in-line package. The package itself offers the possibility of integrating additionally the input bridge rectifier. The paper discusses the thermal performance of the module concept by working out the impact of...
This paper reports on new concept consisting of all-oxide-based device component for future high density non-volatile data storage with stackable structure. We demonstrate a GaInZnO (GIZO) thin film transistors (TFTs) integrated with 1D (CuO/InZnO)-1R (NiO) (one diode-one resistor) structure oxide memory node element. RRAM (Resistance Random Access Memory) has provided advantages in fabrication which...
This paper proposes a high-performance line-interactive DVR which can compensate the voltage interruption within 2 ms. The operational feasibility was verified through computer simulations and experimental works with a 3 kVA prototype. The developed system can compensate the input voltage sag and interruption within 2 ms, in which the maximum allowable duration of voltage interruption is 2 seconds...
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