Specification of minimum short-circuit capacity for three-phase unbalance limitation based on an efficient algorithm

Kao, F.-C.; Chen, S.L.

doi:10.1016/s0378-7796(96)01121-2

Cited by 1 publication

(2 citation statements)

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“…The Norton equivalent current is separated using RICA. The matrix of mixing coefficients is calculated according to Equation (24). The equivalent impedance magnitude is obtained according to the linear relationship between the mixed matrix elements and the upstream and downstream equivalent impedances, as shown in Equation (28).…”

Section: Calculation Steps and Flow Chartmentioning

confidence: 99%

“…The traction load of the electrified railway was powered by single-phase AC power, which destroys the symmetrical operating conditions of the power system. When the three-phase power system supplies power to it, a large number of negative-sequence components will appear in the system, resulting in unbalanced three-phase voltage of the power system [22][23][24].…”

Section: Three-phase Unbalance Factorcalculation Based On Measured Datamentioning

confidence: 99%

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Determining the Responsibility of Three-Phase Unbalanced Sources Based on RICA

Yang

Wang

2019

Energies

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Voltage unbalance is one of the main power quality problems, and the source of many negative effects on utilities that are experienced by customers. In this paper, a method based on robust independent component analysis (RICA) for responsibility division of unbalanced sources is proposed for voltage unbalance. According to the weak correlation between negative-sequence voltage and upstream and downstream current fluctuation at the point of common coupling (PCC), the independent component of the negative-sequence voltage and current fluctuation at the point of common coupling is obtained by RICA. The blind source mixing coefficient matrix can be obtained according to the least squares method. The equivalent negative-sequence impedance on both sides of the PCC can be obtained using the linear correlation between the mixing coefficients. Finally, according to the principle of partial pressure, the unbalance contribution of the upstream and downstream at the PCC is calculated. The method is accurate for upstream and downstream impedance estimation compared with the traditional method, and has a strong anti-interference ability. When the background noise or system fluctuation is large, the responsibility division result is still accurate. The correctness and effectiveness of the proposed method are proven by the simulation of the experimental circuit.

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Section: Calculation Steps and Flow Chartmentioning

confidence: 99%

Section: Three-phase Unbalance Factorcalculation Based On Measured Datamentioning

confidence: 99%