Proceedings ArticleDOI
A PWM rectifier control technique for three-phase double conversion UPS under unbalanced load
Min Dai,Mohammad N. Marwali,Jin-Woo Jung,Ali Keyhani +3 more
- Vol. 1, pp 548-552
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TLDR
A notch filter based voltage control loop is proposed to eliminate the second harmonic component in the dc-link voltage feedback signal and achieve balanced three-phase input currents and the effectiveness of the proposed control technique in decoupling the rectifier and the inverter under unbalanced load.Abstract:
PWM rectifiers are widely used in three-phase ac-dc-ac systems due to its capability in dc voltage boost and regulation, input power factor correction, and input current harmonic control. However, with the conventional rectifier control technique, the input current tends to be unbalanced under unbalanced inverter load, which contaminates input power source and is therefore undesirable. In this paper, the cause of the unbalancing is disclosed by evaluating the spectra of the switching functions of the full bridge three-phase inverter analytically using Bessel function under standard space vector PWM switching scheme, which relates the dc link current and voltage ripples to the inverter load balancing. The analysis shows that the dc link voltage contains significant second order harmonic component which affects the voltage loop of the rectifier controller, especially when the control gain is high. A notch filter based voltage control loop is proposed to eliminate the second harmonic component in the dc-link voltage feedback signal and achieve balanced three-phase input currents. Simulation and experimental results are presented to demonstrate the effectiveness of the proposed control technique in decoupling the rectifier and the inverter under unbalanced load.read more
Citations
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References
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Analysis and realization of a pulsewidth modulator based on voltage space vectors
TL;DR: In this article, a space vector concept for deriving the switching times for pulsewidth-modulated voltage source inverters is compared with the conventional sinusoidal concept, which results in lower current harmonics and possibly a higher modulation index.
Journal ArticleDOI
Control of distributed generation systems-Part I: Voltages and currents control
Mohammad N. Marwali,Ali Keyhani +1 more
TL;DR: In this paper, a digital control strategy for three-phase pulse-width modulation voltage inverters used in a single stand-alone ac distributed generation system is discussed, which utilizes the perfect robust servomechanism problem control theory to allow elimination of specified unwanted voltage harmonics from the output voltages under severe nonlinear load and to achieve fast recovery performance on load transient.
Journal ArticleDOI
Regulation of a PWM rectifier in the unbalanced network state using a generalized model
TL;DR: In this article, a generalized model of the PWM rectifier is presented using the Clarke notation in order to separate the positive and negative sequences of a PWM signal and an optimized regulation is presented for the latter case.
Proceedings Article
AC/DC/AC PWM converter with reduced energy storage in the DC link
TL;DR: In this paper, the authors introduce the family of quasi-direct converters, i.e., forced-commutated ac/dc/ac converters including small energy storage devices in the dc link.
Journal ArticleDOI
Design aspects of synchronous PWM rectifier-inverter systems under unbalanced input voltage conditions
TL;DR: In this article, a complete analysis of a synchronous front-end PWM rectifier-inverter system under unbalanced input voltage conditions is presented, including the harmonic assessment of input/output current and voltage waveforms.
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