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This paper presents an improved dc-link voltage fast control strategy based on energy balance for a pulse width modulation (PWM) rectifier–inverter system to reduce the fluctuation of dc-link voltage. A conclusion is drawn that the energy in dc-link capacitor cannot be kept constant in dynamic process when the system operates in rectifier mode, even in ideal case. Meanwhile, the minimum dc-link voltage...
Power loss of semiconductor devices is the critical element, reflecting efficiency of the converter system indirectly. The loss of devices is consisted of steady state loss and transient loss. This paper introduces a functional model of transient power loss for IGBT to study the impact of different parameters on transient loss. Both turn-on and turn-off processes are analyzed in detail and mathematic...
The back-to-back converter is widely used in 4-quadrant adjustable speed drive (ASD) system, active power filter (APF) and wind power grid system attributed to its high power factor and low current harmonics on grid side. In order to attain better performance in driving induction motor of 55kW, the nominal value of DC-link voltage is determined at 700V, which puts forward high request on converter...
This paper presents an improved DC-link voltage fast control strategy for a PWM rectifier-inverter system to reduce the fluctuation of DC-link voltage. In this paper, a conclusion is drawn based on the instantaneous energy balance analysis of the whole system that the energy stored in the DC-link capacitor will fluctuate during dynamic process in rectifier mode, even in ideal case. Then, when the...
The key parameters of SOA (safe operating area) of semiconductor devices are hard to be measured when converter is operating, which is not helpful to protect converter at any time. On the other hand, surplus estimating method is widely used to design the main circuit. In order to guarantee the whole system works safely and improve utilization rate of devices, the concept of SSOA (systematic safe operating...
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