A technique for power supply harmonic impedance estimation using a controlled voltage disturbance

Sumner, Mark; Palethorpe, B.; Thomas, David William; Zanchetta, Pericle; Piazza, Maria Carmela Di

doi:10.1109/63.988831

Cited by 135 publications

(60 citation statements)

References 12 publications

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“…By considering the overall grid impedance dominated by the resistance and inductance terms, (9) can be expressed as (10). …”

Section: Rls Algorithm Implementationmentioning

confidence: 99%

“…Methods for the identification of the grid impedance can be classified into those requiring the use of dedicated devices and those that can be implemented without any additional hardware. Methods in the first group are often able to estimate the impedance over a wide frequency range using signal injection and frequency based techniques [9], [10]. Regarding the second group, impedance estimation could be implemented using two different approaches: 1) model-based techniques and, 2) signal-injection based techniques.…”

Section: Introductionmentioning

confidence: 99%

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Observer-Based Pulsed Signal Injection for Grid Impedance Estimation in Three-Phase Systems

Garcia

Sumner

Navarro-Rodríguez

et al. 2018

IEEE Trans. Ind. Electron.

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Abstract-This paper addresses the estimation of the grid impedance and the control of grid-tied converters by combining pulsed-signal injection and observer based techniques. A Luenberger based observer is used for controlling the grid-side current of an LCL filter by only measuring the converter-side currents and the grid-side voltage. This configuration mitigates the effects of parameter variation at the LCL filter. Under grid impedance changes, the observer control signal will be used for triggering the signal injection. A Pulsed Signal Injection (PSI) approach is employed for estimating online the grid impedance using an RLS algorithm. Compared with existing grid-impedance estimation techniques, the proposed method can: 1) identify a generic RL grid impedance, even under unbalanced conditions; 2) reduce the distortion induced by the excitation signal by relying on the observer to triggering the injection when a grid impedance change is detected; 3) Identify grid impedance values much lower than the converter filter impedance, which is the usual situation when the converter rated power is well below the grid rating. Finally, it is worth pointing out that the proposed estimation technique is well suited to be incorporated into an adaptive current controller scheme.

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“…By considering the overall grid impedance dominated by the resistance and inductance terms, (9) can be expressed as (10). …”

Section: Rls Algorithm Implementationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Observer-Based Pulsed Signal Injection for Grid Impedance Estimation in Three-Phase Systems

Garcia

Sumner

Navarro-Rodríguez

et al. 2018

IEEE Trans. Ind. Electron.

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“…Active Impedance Estimation (AIE), the method proposed in this paper for retuning the STATCOM AC voltage controller was first presented for use in active filter control [8]. AIE is a method for estimating the system impedance by using a power electronic converter to introduce a small, short-term, current disturbance to the system.…”

Section: Controller Retuningmentioning

confidence: 99%

Impedance sensitive STATCOM control for systems supported by renewable generation

Rose

Sumner

Thomas

et al. 2014

3rd Renewable Power Generation Conference (RPG 2014)

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Reactive power control is known to be an effective means of controlling voltage; however, for optimal performance, the system reactance must be known. Power systems with high renewable energy penetration have been known to have voltage stability issues. To further complicate this issue, distributed renewable sources are likely to have an effect on the local system impedance. As a result, connection and disconnection of such sources is likely to result in significant changes in system impedance. In this paper, impedance estimation is used to dynamically tune the controllers of a STATCOM so that consistent dynamic performance may be obtained. The method has been verified through simulation and through laboratory-based experimentation.

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“…Impedance estimation techniques have been shown to be a useful and flexible tool in identifying, locating and classifying faults [6]. This paper describes one impedance estimation technique, Active Impedance Estimation (AIE), first described in [7], and how it has been used to locate and classify faults. AIE aims to calculate the impedance from the point of measurement to the fault.…”

Section: Introductionmentioning

confidence: 99%

“…2 Experimental system 2.1 Active Impedance Estimation AIE is a method for estimating the system impedance by introducing a small, short-term, current disturbance [7]. The AIE unit consists of a power electronic inverter which is used to inject the current disturbance onto the power system.…”

Section: Introductionmentioning

confidence: 99%

Intelligent impedance based fault-location for zonal power systems

Rose¹,

Thomas²,

Sumner³

et al. 2014

12th IET International Conference on Developments in Power System Protection (DPSP 2014)

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A laboratory based demonstrator has been constructed to study the Active Impedance Estimation (AIE) technique as a means of locating faults on a power system. The demonstrator has been used to verify results from simulation experimentally. The AIE system and associated signal processing are presented and some of the issues that have been encountered are discussed. The presented simulation and experimental results presented both validate the method used.

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A technique for power supply harmonic impedance estimation using a controlled voltage disturbance

Cited by 135 publications

References 12 publications

Observer-Based Pulsed Signal Injection for Grid Impedance Estimation in Three-Phase Systems

Observer-Based Pulsed Signal Injection for Grid Impedance Estimation in Three-Phase Systems

Impedance sensitive STATCOM control for systems supported by renewable generation

Intelligent impedance based fault-location for zonal power systems

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