Analysis of three-phase AC-DC converters under unbalanced supply conditions

Rashid, M.H.; Maswood, Ali I.

doi:10.1109/28.2895

Cited by 62 publications

(8 citation statements)

References 7 publications

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“…Under unbalanced source conditions, significant triplen harmonics, especially the 3 rd , can be produced [8], [9]. The triplen harmonics are described in (4) and (5).…”

Section: A Harmonicsmentioning

confidence: 99%

Effect of Supply Unbalance on Harmonic Emissions of Uncontrolled Six-Pulse Rectifiers

Taylor¹,

Halpin²

2024

RE&PQJ

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Standards dealing with power quality disturbances and emission limits for equipment and installations are constantly evolving as additional knowledge is gained. Often, each type of disturbance, such as harmonics, is considered individually and without regard for the possible effects of other types of disturbances, such as unbalance. The interdependencies between the disturbance phenomena are often disregarded. The work reported in this paper is focused on quantifying and correlating the effect of supply system unbalance on the harmonic emissions of the most basic harmonic-producing converter, the uncontrolled six-pulse rectifier. Six-pulse rectifiers with different loading conditions are supplied by sources with varying levels of unbalance to determine the effect of the unbalance on harmonic emissions via simulation. Different unbalanced supply conditions, all within credible levels, are considered and the effects on the harmonic emissions of the six-pulse rectifier are evaluated. The results of these simulations show that as source unbalance increases, THD and triplen harmonics also increase in a nearly-linear pattern. This type of relationship may be appropriate for consideration in the ongoing efforts in standardization related to both harmonics and unbalance so that more coordinated decisions can be made.

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“…Under unbalanced source conditions, significant triplen harmonics, especially the 3 rd , can be produced [8], [9]. The triplen harmonics are described in (4) and (5).…”

Section: A Harmonicsmentioning

confidence: 99%

Effect of Supply Unbalance on Harmonic Emissions of Uncontrolled Six-Pulse Rectifiers

Taylor¹,

Halpin²

2024

RE&PQJ

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“…The analytical expression of fault signatures at the bus link previously outlined ( 26) can be used to make a novel generalized approach that analytically determines the harmonics related to the broken bar or air-gap eccentricity at the diode rectifier supply line current. To calculate these harmonic components and to clarify the frequencies transferred from the bus to the diode rectifier supply line current, the modulation theory can be a useful tool to extract f bus frequencies at the AC side [28,29].…”

Section: The Fault Signatures In Rectifier Supply Line Currentmentioning

confidence: 99%

The Propagation Mechanism of Fault Signatures in Squirrel Cage Induction Motor Drives

Maouche

Oumaamar

Boucherma

et al. 2019

J. Electr. Eng. Technol.

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This work presents a new approach for analyzing the propagation mechanism of fault signatures in squirrel cage induction motor drives. The used method is based on the analysis of different currents of solid states converters and the fault signatures are investigated when motor is supplied by the volt-per-hertz control mode. Analytical expressions of currents at different location for broken bar, mixed air-gap eccentricity, unbalanced voltage supply are developed using switching functions of both inverter and diode rectifier. Experimental results are provided throughout the paper, to underpin the theoretical analysis. The results show that capacitor current spectrum can give useful information about the state of squirrel cage induction motor. However, due to the low-pass filter composed by capacitor only the fault signatures at low frequency range can be detected from the rectifier supply line current spectrum.

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“…The equation for the three-phase positive sequence mapping function in the frequency domain derived from [13][14][15] is as follows: Assume that the three-phase balanced positive sequence voltage is:…”

Section: Research On Input Impedance Of Voltage Source Type Nonlinearmentioning

confidence: 99%

Research on Harmonic Current Amplification Effect of Parallel APF Compensating Voltage Source Nonlinear Load

Wei

et al. 2019

Energies

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A parallel active power filter (APF) is generally used to suppress dynamic harmonic current and compensate reactive power in the grid. However, parallel APF may have a negative effect on the load current when compensating the nonlinear load of a voltage source type, which may lead to the amplification effect of the load harmonic current. In this paper, the fundamental causes of harmonic current amplification were analyzed by studying the harmonic current amplification effect when a parallel APF compensates a nonlinear load. According to the results of the theoretical derivation, a feasible method to limit this current amplification effect by changing the system structure and the APF’s own control was proposed, and the corresponding design scheme is given. Finally, the correctness of the theoretical derivation of the harmonic current amplification effect and the feasibility of the proposed solution were proven through simulation and experiment.

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Analysis of three-phase AC-DC converters under unbalanced supply conditions

Cited by 62 publications

References 7 publications

Effect of Supply Unbalance on Harmonic Emissions of Uncontrolled Six-Pulse Rectifiers

Effect of Supply Unbalance on Harmonic Emissions of Uncontrolled Six-Pulse Rectifiers

The Propagation Mechanism of Fault Signatures in Squirrel Cage Induction Motor Drives

Research on Harmonic Current Amplification Effect of Parallel APF Compensating Voltage Source Nonlinear Load

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