A four-wire, current-controlled converter provides harmonic neutralization in three-phase, four-wire systems

Quinn, Conor; Mohan, Ned; Mehta, H.

doi:10.1109/apec.1993.290773

Cited by 92 publications

(26 citation statements)

References 7 publications

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“…From (17), the effect of 0.5i N (t) from the zero sequence is not noticeable in the voltage [v U (t)+v L (t)] across the dc bus, as is evident in the graphs of (c), which have a dc constant with a 100-Hz ripple of single-phase power. The voltages of the upper capacitor and lower capacitor in the graphs of (b) contain a dc, 50 Hz of the zero-sequence current, and 100 Hz of the single phase power.…”

Section: B Experiments Validation For Vsc Connected To Ac Gridmentioning

confidence: 83%

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Switching Functions Model of a Three-phase Voltage Source Converter (VSC)

Fazeli¹,

Ping²,

Rahim³

et al. 2017

Journal of Power Electronics

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The equivalent circuit of a three-leg, four-wire voltage source converter (VSC) is derived using switching functions. Simulations and experiments are conducted (i) to investigate the effects of the zero sequence on VSCs when a three-phase imbalance exists and (ii) to use the consistency of simulations and laboratory experiments to validate the equivalent circuit. The impact of a three-phase imbalance on the VSC has yet to be fully investigated because of the lack of an equivalent circuit to show rigorously how the zero sequence currents flow through the VSC.

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Section: B Experiments Validation For Vsc Connected To Ac Gridmentioning

confidence: 83%

“…Thus, when both the ac voltages and the ac currents have a zero sequence, second-harmonic components appear on the dc-side of VSCs [17].…”

Section: A Double Line Frequency Componentmentioning

confidence: 99%

Switching Functions Model of a Three-phase Voltage Source Converter (VSC)

Fazeli¹,

Ping²,

Rahim³

et al. 2017

Journal of Power Electronics

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“…21. It can be seen that due to resistance emulation action [see (1)], the phase currents are roughly proportional to their respective input phase voltages. The unbalanced line currents return to the source through the neutral as shown.…”

Section: Effect Of Input Voltage Unbalancesmentioning

confidence: 99%

“…Consequently, the line currents in the distribution system contain considerable lower order harmonics, the neutral wire carries excessive current, and the system operates at low input power factor. These cause considerable overheating in the neutral wire and in the distribution transformer supplying the load [1]- [3].…”

mentioning

confidence: 99%

Control of Three-Phase, Four-Wire PWM Rectifier

Ghosh

Narayanan

2008

IEEE Trans. Power Electron.

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Abstract-This paper presents the analysis, design, and control of a four-wire rectifier system using split-capacitor topology. The proposed controller does not require any complex transformation or input voltage sensing. A detailed analysis of the distortions in the line and the neutral currents is presented. It is shown that the single-carrier-based, conventional sine-triangle PWM (CSPWM) scheme results in a peak-to-peak neutral current ripple, which is greater than the peak-to-peak ripple of any of the line currents. Also, for the same operating condition, the distortions in the line and the neutral currents increase considerably, when a three-limb boost inductor is used instead of three single-phase inductors. A three-carrier-based SPWM scheme is proposed in this paper. Compared to CSPWM, the proposed scheme significantly reduces the neutral current ripple when three single-phase inductors are used, and reduces both line and neutral current ripples when a three-limb inductor is used. The control scheme is verified through Matlab simulation. It is implemented on an field-programmable gate-array (FPGA)-based digital controller and tested on a prototype. Simulation and experimental results are presented.

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“…The excessive neutral currents can cause damage both in the neutral conductor and in the transformer to which it is connected (Quinn et al, 1992). Thereby, active filter topologies have been used to compensate neutral harmonic currents (Quinn et al, 1992;Quinn et al, 1993;Thomas el al., 1996). Uninterruptible power supply (UPS) systems have enabled the improvement of power source quality, providing clean and uninterruptible power to critical loads such as industrial process controls, computers, medical equipment, data communication systems, and protection against power supply disturbances or interruptions (Oliveira da Silva et al, 2001;Kamran et al, 1995;Jeon et al, 1997, Cheung et al, 1996Lin et al, 1993).…”

Section: Introductionmentioning

confidence: 99%