Topic
Three-phase
About: Three-phase is a research topic. Over the lifetime, 16801 publications have been published within this topic receiving 159477 citations.
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TL;DR: A hybrid PWM (HPWM) strategy is proposed to suppress the zero sequence circulating current (ZSCC) based on the same zero sequence voltage injected, which is dependent on the common grid information.
Abstract: The parallel three-phase grid-connected converters sharing dc and ac bus can increase the system power level effectively. However, the zero sequence circulating current (ZSCC) will occur inevitably under space vector pulse width modulation or discontinuous pulse width modulation (DPWM). In this paper, the mechanism and the mathematical model of ZSCC are studied. Then, a hybrid PWM (HPWM) strategy is proposed to suppress the ZSCC based on the same zero sequence voltage injected, which is dependent on the common grid information. The dc voltage utilization of HPWM can be extended compared with sinusoidal PWM (SPWM). The number of parallel modules can be infinity theoretically by using HPWM. It is noted that there is no internal commutation among modules (expect the dq current reference). Finally, the feasibility and the effectiveness of the proposed method are verified by experiments.
43 citations
TL;DR: In this article, a new approach based on the current and a virtual flux is proposed for the detection of rotor cage fault in a three-phase PWM feed induction motor, which improves the signal to noise ratio.
43 citations
06 Oct 2002
TL;DR: In this paper, a new time domain model for electric arc furnaces using MATLAB is presented, which can simulate both nonlinear and time varying nature of such loads, which create flicker, harmonics, and voltage/current unbalance.
Abstract: This paper presents a new time domain model for electric arc furnaces using MATLAB The model can simulate both nonlinear and time varying nature of such loads, which create flicker, harmonics, and voltage/current unbalance In this model, Cassie and Mayr equations are used in three-phase mode and the effects of arc furnace transformer tap changer and flexible cables mutual inductances are considered The proposed model takes into account the system inter-relation of parameters and arcing conditions as well
43 citations
TL;DR: In this paper, a new scheme for power transformers protection based on the analysis of the harmonic content of the differential current Park's vector modulus is presented. But the proposed method is unable to detect turn-to-turn winding insulation failures, and to distinguish them from magnetising inrush current transients.
Abstract: This study presents a new scheme for power transformers protection, which is based on the analysis of the harmonic content of the differential current Park's vector modulus. The proposed method is able to detect turn-to-turn winding insulation failures, and to distinguish them from magnetising inrush current transients. Experimental and simulation results are presented and discussed.
43 citations
TL;DR: In this paper, a three-phase, two-switch, power factor correction (PFC) rectifier that can achieve less than 5% input-current total harmonic distortion (THD) and features zerovoltage switching (ZVS) of all the switches over the entire input-voltage and load ranges is introduced.
Abstract: A new, three-phase, two-switch, power-factor-correction (PFC) rectifier that can achieve less than 5% input-current total harmonic distortion (THD) and features zero-voltage switching (ZVS) of all the switches over the entire input-voltage and load ranges is introduced. The proposed rectifier also offers automatic voltage balancing across the two output capacitors connected in series, which makes it possible to use downstream converters designed with lower voltage-rated component that offer better performance and are less expensive than their high-voltage-rated counterparts. In addition, the proposed rectifier also exhibits low common-mode EMI noise. The performance of the proposed rectifier was evaluated on a 2.8-kW prototype with a 780-V output that was designed to operate in 340-520-VL-L, RMS input-voltage range.
43 citations