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Randomized modulation schemes are often employed in DC-DC converters to reduce the magnitude of discrete harmonics in the output spectrum. One of these schemes is Randomized Switching Frequency modulation (RSFM) that completely eliminates the discrete harmonics by randomizing its switching period (switching frequency) to follow a uniform distribution. In this paper, we investigate RSFM with its switching...
In order to eliminate the motor harmonic torques, waveform optimizing control strategy of the stator current is always adopted in a drive system. This paper presents an improved hysteresis current control method, which analyzes a traditional hysteresis current controller and combines a voltage space vector modulate method. This method combines comparison results of hysteresis current and the arm period...
Controlling of a specific harmonic by a switching converter with switching frequency lower than 1 kHz was originally implemented by two-level optimal pulse pattern with unsymmetrical switching angles, namely by OPUS-technique. That means, given a desired fundamental and one or more specific harmonics, the problem is to find the switching times (angles) that produce the fundamental while generating...
Controlling of a specific harmonic by a switching converter with switching frequency lower than 1 kHz was originally implemented by two-level optimal pulse pattern with unsymmetrical switching angles, namely by OPUS-technique. That means, given a desired fundamental and one or more specific harmonics, the problem is to find the switching times (angles) that produce the fundamental while generating...
Modular current source converters (MCSC) can enhance the current capacity and improve the power quality at medium voltage PWM motor drives. A MCSC uses individual three-phase modules in a shunt connection to share the total power in a symmetrical manner. The modulation of these units is normally done using optimized patterns as selective harmonic elimination (SHE). However, the optimization is usually...
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