Applying PWM to control overcurrents at unbalanced faults of forced-commutated VSCs used as static VAr compensators

Jiang, Ying; Ekström, Å.

doi:10.1109/61.568250

Cited by 29 publications

(18 citation statements)

References 8 publications

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“…Another problem associated with unbalanced network voltages is the flow of the negative-sequence currents on the ac side that may force the compensator offline in case of overcurrent. The problem of second harmonic oscillation on the dc side and overcurrent limiting is for a StatCom addressed in [4]- [6]. In [4], one extra inverter is used only for negative-sequence control.…”

Section: Introductionmentioning

confidence: 99%

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Improved D-StatCom control for operation with unbalanced currents and voltages

Blažič

Papič

2006

IEEE Trans. Power Delivery

105

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This paper presents a new D-StatCom control algorithm which enables separate control of positive-and negative-sequence currents and decoupled control of -and -axes current components. The algorithm is based on the developed mathematical model in the -coordinates for a D-StatCom operating under unbalanced conditions. The problem of dc-side voltage ripple and ac-side harmonics generation due to unbalanced voltages/currents is solved by using switching function modulation, enabling the use of a relatively small capacitor on the dc side. The control algorithm is also suitable for high-power applications using multipulse voltage-source converters. The algorithm is tested by means of detailed simulation using PSCAD, where the performance is validated in the case of severe network fault and in the case of unbalanced load compensation. The compensator voltages are generated by means of pulsewidth modulation.

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Section: Introductionmentioning

confidence: 99%

“…In terms of active compensation devices that are based on a voltage-source converter (VSC), the majority of studies concentrate on two aspects of converter operation under unbalanced conditions: the effect of unbalanced network voltages on converter operation ([2]- [6]) and active compensation of unbalanced loads ( [7]- [12]). …”

Section: Introductionmentioning

confidence: 99%

Improved D-StatCom control for operation with unbalanced currents and voltages

Blažič

Papič

2006

IEEE Trans. Power Delivery

105

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“…3. Because a period of the source current is used to calculate the rms of the current, the calculate part can be expressed as a first-order inertia element and a proportion model [26], [27]. The time delay is T f /2 (T f is the current period, 20ms).…”

Section: A Current Control Loopmentioning

confidence: 99%

Analysis and Design of the Interface Inductor and the DC Side Capacitor in a STATCOM with Phase and Amplitude Control Considering the Stability of the System

Zhao¹,

Han²,

Liu³

2012

Journal of Power Electronics

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Previous publications regarding the design and specifications of the interface inductor and the DC side capacitor for a STATCOM usually deal with the interface inductor and the DC side capacitor only. They seldom pay attention to the influences of the interface inductor and capacitor on the performance of a STATCOM system. In this paper a detailed analysis of influence of the interface inductor and the DC side capacitor on a STATCOM system and the corresponding design considerations is presented. Phase and amplitude control is considered as the control strategy for the STATCOM. First, a model of a STATCOM system is carried out. Second, through frequency domain methods, such as transfer functions and Bode plots, the influence of the interface inductor and the DC side capacitor on the stability and filtering characteristics of the STATCOM are extensively investigated. Third, according to this analysis, the design considerations based on the phase margin for the interface inductor and the DC side capacitor are discussed, which leads to parameters that are different from those of the traditional design.

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“…(7) is used to obtain the modulation indices required to meet the reactive power exchange as given by eq. (12). The method is termed static control scheme since the modulation indices are fixed.…”

Section: A Three-phase Statcomsmentioning

confidence: 99%

Single-phase PWM converters array for three-phase reactive power compensation. I. Time domain studies

Madrigal¹,

Anaya²,

Acha³

et al.

Ninth International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.00EX441)

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This paper presents the harmonic model of a simple three-phase STATCOM structure. It is based on the use of three single-phase PWM converters. This novel converter structure has the ability to restore voltage imbalances at the point of connection. The highly developed graphic facilities available in PSCAD/EMTDC are used to implement the model. Two different control schemes are presented, the first one uses a static control, based on steady state considerations, and the second one uses a dynamic control scheme. The use of the static control scheme reduces simulation time and code implementation, but perhaps more important is the fact that, for steady state analysis purposes, it yields results that are in close agreement with those given by the dynamic control scheme.Kegwords-Static VAR compensators, harmonic analysis, PWM, EMTDC.

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Applying PWM to control overcurrents at unbalanced faults of forced-commutated VSCs used as static VAr compensators

Cited by 29 publications

References 8 publications

Improved D-StatCom control for operation with unbalanced currents and voltages

Improved D-StatCom control for operation with unbalanced currents and voltages

Analysis and Design of the Interface Inductor and the DC Side Capacitor in a STATCOM with Phase and Amplitude Control Considering the Stability of the System

Single-phase PWM converters array for three-phase reactive power compensation. I. Time domain studies

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