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Harmonics are voltages and currents which have frequency components that are integers multiple of the fundamental frequency - polluting the pure sinusoidal waveform. This paper deals with basics of harmonics, causes that generate harmonics and Estimation of power quality measurements such as individual harmonic distortion, %Total Harmonic Distortion (THD), RMS and Peak-to-peak values using tool LAB...
Boost converter is the common topology of power factor correction (PFC) in the market. Also, one cycle control is an attractive control as it proves its validity as a commercial IC. Recently PFC AC-DC converters have encountered low-frequency instability that increases its THD and so decreases the input power factor that breaks its operation. In this paper, PFC boost converter with one cycle control...
Powering multiple computer loads connected phase-neutral in a 3-phase wye distribution system places exceptional thermal stresses on the switchgear, transformers and wiring of that system. The presence of harmonic currents can lead to equipment failures and, in the worst case, fires. Harmonic currents also cause reduced efficiency of use resulting in wasted energy and extra operating costs. A number...
This paper presents a new switching strategy controlling a new three-level voltage source inverter, resulting in different 25 space voltage-vectors. The new inverter combines some desirable features of two and three-level inverters. The proposed open-leg switching strategy intentionally opens one of the three inverter-legs per-time, in a pre-planned sequence. Thus, the number of allowed states becomes...
This paper presents a new switching strategy controlling a new three-level voltage source inverter, resulting in different 25 space voltage-vectors. The new inverter combines some desirable features of two and three-level inverters. The proposed open-leg switching strategy intentionally opens one of the three inverter-legs per-time, in a pre-planned sequence. Thus, the number of allowed states becomes...
This paper presents a new modification for the most-common, simple, and well-known three-phase six-switch voltage source inverter (VSI). In this modification, each one of the six transistors conducts for 150deg instead of the known 180deg or 120deg conduction modes. For a wye-connected load, the output phase-voltage becomes a seven-level, 12 steps waveform. This results in a 50% reduction of the total...
This paper presents a new switching strategy controlling a new three-level voltage source inverter, resulting in different 25 space voltage-vectors. The new inverter combines some desirable features of two and three-level inverters. The proposed open-leg switching strategy (OLSS) intentionally opens one of the three inverter-legs per-time, in a pre-planned sequence. Thus, the number of allowed switching...
This paper presents a new modification for the most-common, simple, and well-known three-phase voltage source inverter (VSI). In this modification, each one of the six transistors conducts for 150deg instead of the usual 180deg or 120" conduction modes. For a wye-connected load, the output phase-voltage becomes a seven-level, 12 Steps waveform-which is closer to the sinusoidal waveform-than the...
This paper presents a new modification for the most-common, simple, and well-known three-phase six-switch voltage source inverter (VSI). In this modification, each one of the six transistors conducts for 150deg instead of the known 180deg or 120deg conduction modes. For a wye-connected load, the output phase-voltage becomes a seven-level, 12 steps waveform. This results in a 50% reduction of the total...
This paper presents a new modification for the most-common, simple, and well-known three-phase voltage source inverter (VSI). In this modification, each one of the six transistors conducts for 150deg instead of the usual 180deg or 120deg conduction modes. For a wye-connected load, the output phase-voltage becomes a seven-level, 12 steps waveform which is closer to the sinusoidal waveform than the...
A method is proposed in this paper for designing a series active harmonic filter which can eliminate voltage harmonic present in the busbar voltage by producing of a PWM controlled harmonic voltage. According to this method the active filter produces PWM voltage that cancels completely the existing harmonic voltage due to any harmonic voltage source up to any order. The proposed method is valid for...
This work proposes a bidirectional high-frequency link inverter using center-tapped high-frequency transformer. The topology also incorporates a regenerative snubber to clamp the high voltage spikes due to the leakage inductance of the transformer. The closed-loop control method used is deadbeat control, which provides fast response and low harmonic distortion, even under nonlinear loads. A 1 kVA...
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