Exact Voltage Unbalance Assessment Without Phase Measurements

Ghijselen, Jozef; Bossche, A.P.M. Van den

doi:10.1109/tpwrs.2004.841145

Cited by 57 publications

(22 citation statements)

References 4 publications

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“…To assess such adverse effects, the "true" voltage unbalance factor (UF) for three-phase sinusoidal voltage waveforms is presented in [15]. According to this, the UF is defined as:…”

Section: Voltage Unbalance Factormentioning

confidence: 99%

An Improved Control Strategy Using a PI-Resonant Controller for an Unbalanced Stand-Alone Doubly-Fed Induction Generator

Phan¹,

Lee²,

Chun³

2010

Journal of Power Electronics

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The main cause of degradation in an unbalanced stand-alone doubly-fed induction generator (DFIG) system is negative sequence components that exist in the generated stator voltages. To eliminate these components, a hybrid current controller composed of a proportional-integral controller and a resonant regulator is developed in this paper. The proposed controller is applied to the rotor-side converter of a DFIG system for the purpose of compensating the negative stator voltage sequences. The proposed current controller is implemented in a single positive rotating reference frame and therefore the controller can directly regulate both the positive and negative sequence components without the need for sequential decomposition of the measured rotor currents. In terms of compensation capability and accuracy, simulations and experimental results demonstrated the excellent performance of the proposed control method when compared to conventional vector control schemes.

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“…To assess such adverse effects, the "true" voltage unbalance factor (UF) for three-phase sinusoidal voltage waveforms is presented in [15]. According to this, the UF is defined as:…”

Section: Voltage Unbalance Factormentioning

confidence: 99%

An Improved Control Strategy Using a PI-Resonant Controller for an Unbalanced Stand-Alone Doubly-Fed Induction Generator

Phan¹,

Lee²,

Chun³

2010

Journal of Power Electronics

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“…The majority of publications studied the underlying power imbalance components, i.e., voltage/current imbalances: References [16], [17], [18] estimated voltage imbalance of medium-voltage (MV) distribution networks. Reference [19] assessed the sequence values of imbalanced voltages without phasor measurements. Reference [20] quantified current imbalance on short transmission lines.…”

Section: Introductionmentioning

confidence: 99%

Three-Phase Power Imbalance Decomposition Into Systematic Imbalance and Random Imbalance

Kong

2018

IEEE Trans. Power Syst.

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“…Nowadays, the unbalance problem has gained lots of attention from utility companies and customers [3,5]. For example, Bollen [6], Kim et al [7], Chindris et al [8] and Ghijselen and Van den Bossche [9] studied the definition, generating mechanism, standards, propagation and mitigation measures for the voltage unbalance. In 2008, the International Electro-Technical Commission (IEC) published a technical report that stipulates the unbalance emission limits for loads when they are connected to the high voltage, medium voltage and low voltage systems [10].…”

Section: Introductionmentioning

confidence: 99%

Contribution Determination for Multiple Unbalanced Sources at the Point of Common Coupling

Sun

et al. 2017

Energies

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Three-phase unbalance is an important power quality issue that can cause many negative effects to the power system. Effective mitigation and management of voltage unbalance will benefit from the knowledge of how the unbalanced sources contribute to the voltage asymmetry at the point of evaluation (POE). In this paper, a method is proposed to assess the overall unbalance contribution of the multiple unbalanced sources at the point of common coupling (PCC). Firstly, the equivalent circuit for analysis is established and the unbalance contribution indices are proposed. Then a method is proposed to determine whether the dominant unbalanced polluter is at the upstream or downstream of POE. If the main unbalanced source is identified to be downstream of POE, a procedure is further proposed to determine the individual contribution of the multiple unbalanced sources. Moreover, for the multiple unbalanced source condition, the current flowing in each feeder is proposed to be used for the contribution estimation instead of the current actually emitted by the unbalanced source. Finally, a method is proposed to estimate the equivalent negative sequence impedance of the aggregate loads. Simulation and field analysis results validate the effectiveness and accuracy of the method.

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Exact Voltage Unbalance Assessment Without Phase Measurements

Cited by 57 publications

References 4 publications

An Improved Control Strategy Using a PI-Resonant Controller for an Unbalanced Stand-Alone Doubly-Fed Induction Generator

An Improved Control Strategy Using a PI-Resonant Controller for an Unbalanced Stand-Alone Doubly-Fed Induction Generator

Three-Phase Power Imbalance Decomposition Into Systematic Imbalance and Random Imbalance

Contribution Determination for Multiple Unbalanced Sources at the Point of Common Coupling

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