IEEE Guide for Self-Commutated Converters

doi:10.1109/ieeestd.1987.81536

Cited by 4 publications

(4 citation statements)

References 15 publications

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“…IEEE Std. 936 [ 30 ] defines the phase voltage unbalance ratio as the ratio between the maximum phase voltage deviation from the minimum phase voltage and the average voltage, by means of the following equation:

where V a , V b , V c are the moduli (RMS values) of the phase voltage phasors and V phase_avg is calculated by Equation (8). Note that this factor is named PVUR’ in this paper in order to differentiate it from the PVUR obtained by means of Equation (7).…”

Section: Definitions Of Voltage Unbalance Factorsmentioning

confidence: 99%

“…141 [ 29 ] and IEEE Std. 936 [ 30 ]), respectively. The expressions shown in this table have been obtained by applying Equation (5) in per unit for LVUR (second column), Equation (7) in per unit for PVUR (third column) and Equation (9) for PVUR’ (last column) to the voltage phasor expressions shown in the second column of Table 1 .…”

Section: Definitions Of Voltage Unbalance Factorsmentioning

confidence: 99%

“…141 [ 29 ]); and PVUR’ (Equation (9), according to IEEE Std. 936 [ 30 ]). The six unbalance voltage scenarios discussed in Section 2.5 (see Table 1 and Table 2 ) are considered for the comparison.…”

Section: Proposal Of a New Voltage Unbalance Factormentioning

confidence: 99%

“…3 According to IEEE Std. 936 [ 30 ], i.e., by means of Equation (9) in per unit. h = remaining voltage with respect to rated voltage (1 = no voltage drop; 0 = 100% voltage drop).…”

Section: Figurementioning

confidence: 99%

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New Smart Sensor for Voltage Unbalance Measurements in Electrical Power Systems

Bogarra

Saura

Rolán

2022

Sensors

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This paper deals with voltage unbalances and how they can be quantified according to the standards. Firstly, a comparison between the different unbalance voltage factors is conducted in order to remark on their divergences. Secondly, according to the standard that better represents the phenomenon, i.e., EN 50160, a new methodology is proposed to quantify the voltage unbalance factor (VUF). In order to do so, it is recommended to measure the voltage unbalance in three-phase installations by means of a new smart sensor based on a single voltage sensor, which measures the direct-current (DC) voltage at the output of a three-phase diode bridge rectifier, while current methods make use of three voltage sensors (which can measure either phase-to-neutral voltages or phase-to-phase voltages). Furthermore, both simulation and experimental results have been carried out to validate the proposed methodology. Finally, a new voltage unbalance factor (and the corresponding methodology to obtain it from the measured DC voltage) is proposed.

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Section: Definitions Of Voltage Unbalance Factorsmentioning

confidence: 99%

Section: Definitions Of Voltage Unbalance Factorsmentioning

confidence: 99%

Section: Proposal Of a New Voltage Unbalance Factormentioning

confidence: 99%

“…3 According to IEEE Std. 936 [ 30 ], i.e., by means of Equation (9) in per unit. h = remaining voltage with respect to rated voltage (1 = no voltage drop; 0 = 100% voltage drop).…”

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

New Smart Sensor for Voltage Unbalance Measurements in Electrical Power Systems

Bogarra

Saura

Rolán

2022

Sensors

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Assessment techniques of the impact of grid-tied rooftop photovoltaic generation on the power quality of low voltage distribution network - A review

Kharrazi

Sreeram

Mishra

2020

Renewable and Sustainable Energy Reviews

132

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Design of a High-Speed Solid-Rotor Induction Machine With an Asymmetric Winding and Suppression of the Current Unbalance by Special Coil Arrangements

Petrov

Pyrhönen

2019

IEEE Access

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High-speed solid-rotor induction machines (IMs) suffer from higher rotor eddy-current losses (as a result of the air-gap flux density harmonics) more than any other type of high-speed machines because of the solid-rotor steel. A double-layer short-pitch asymmetric winding arrangement with prefabricated coils is proposed in this paper to mitigate the solid-rotor losses and enable easier assembly. However, the asymmetric winding also brings some current unbalance because of three-phase asymmetric stator inductances, especially the winding leakage inductances. Current unbalance can cause harmful effects for both the machine and supply, e.g., torque ripples, unbalanced magnetic pulls, and unbalanced thermal loads of the supply network and supply power electronics. Additionally, a three-phase unbalanced current can cause an extra source of electromagnetic emission to the environment, which can be harmful to surrounding electronics and can cause extra eddy-current losses in surrounding solid surfaces (e.g., a metal terminal box). To mitigate the current unbalance, two methods are compared in this paper. The first method is a slight increase of the stator slot height and placing of the coil sides at the top or bottom within the slot height for different phases. The stator slot height is optimized based on the 2-D finite-element method (FEM) to achieve the best solution for mitigation of the current unbalance. The other method is based on the results of the first method, and the coil side position for a specific phase is further adjusted. Unlike conventional methods of mitigating the current unbalance by power electronics, the proposed method suppresses the current unbalance solely by adjusting the machine design, which avoids extra investments for power electronics devices. In addition, the machine control strategy remains unchanged compared with the traditional one.

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IEEE Guide for Self-Commutated Converters

Cited by 4 publications

References 15 publications

New Smart Sensor for Voltage Unbalance Measurements in Electrical Power Systems

New Smart Sensor for Voltage Unbalance Measurements in Electrical Power Systems

Assessment techniques of the impact of grid-tied rooftop photovoltaic generation on the power quality of low voltage distribution network - A review

Design of a High-Speed Solid-Rotor Induction Machine With an Asymmetric Winding and Suppression of the Current Unbalance by Special Coil Arrangements

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