Anti-islanding detector based on a robust PLL

Bifaretti, Stefano

doi:10.1109/ecce.2013.6647083

Cited by 4 publications

(4 citation statements)

References 19 publications

(10 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where the time constant of the frequency measurement setting Tωg is based on [22], and the transmission delay setting τ is from [23].…”

Section: System Strength System Power Flow Length Of Lines Inertia Ofmentioning

confidence: 99%

“…The resulting parameter settings are T ωg = 30 ms; τ = 30 ms; T w = 5 ms (29) where the time constant of the frequency measurement setting T ωg is based on [22], and the transmission delay setting τ is from [23]. The action of the proposed controller was limited to the first two cycles to avoid an increasingly detrimental effect of the delays of Figure 8 in subsequent cycles.…”

Section: System Strength System Power Flow Length Of Lines Inertia Ofmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of Active Current for Large-Scale Wind Turbines Integrated into Weak Grids for Power System Transient Stability Improvement

Zhang

Yuan

2017

Energies

View full text Add to dashboard Cite

Abstract:Power system transient stability is a challenge when integrating large-scale wind turbines into weak grids. This paper addresses the issue of transient stability in such situations by optimizing a wind turbine's active current behavior. A wind turbine's active current reference controller and its setting optimization method are proposed based on analyses of two associated problems: the mechanism for improving transient stability of a single (synchronous) machine infinite bus (SMIB) system, as well as the various physical factor dependencies dictating how active and reactive wind turbine currents affect the swing dynamics of synchronous machines. Analysis of the first problem guided the design of the controller's main structure. Analysis of the second problem guided selection of the control object within a wind turbine's active and reactive currents, as well as helped recognition of the influential physical factors that must be considered in the parameter setting process. The efficiency of the controller and the validity of the analyses were verified by case studies using Kundur's two-area system.

show abstract

“…where the time constant of the frequency measurement setting Tωg is based on [22], and the transmission delay setting τ is from [23].…”

Section: System Strength System Power Flow Length Of Lines Inertia Ofmentioning

confidence: 99%

Section: System Strength System Power Flow Length Of Lines Inertia Ofmentioning

confidence: 99%

Optimization of Active Current for Large-Scale Wind Turbines Integrated into Weak Grids for Power System Transient Stability Improvement

Zhang

Yuan

2017

Energies

View full text Add to dashboard Cite

show abstract

“…In addition to the basic protections relating to the identification of network off-specifications or malfunctions, such as under voltage/over voltage detection algorithms, the recognition of islanding operation is essential, both when islanding is forbidden and when it is allowed. In the first case, fast disconnection action is required according to the imposed standards [24]. In the second case, the inverter has to switch as fast as possible to voltage mode control, in order to supply local islanded loads, and to separate the isle from the out-of-service grid.…”

Section: Islanding Detectionmentioning

confidence: 99%

Single-Phase Inverter for Grid-Connected and Intentional Islanding Operations in Electric Utility Systems

Lidozzi¹,

Calzo²,

Solero³

et al. 2016

Journal of Power Electronics

View full text Add to dashboard Cite

Small distributed generation units are usually connected to the main electric grid through single-phase voltage source inverters. Grid operating conditions such as voltage and frequency are not constant and can fluctuate within the range values established by international standards. Furthermore, the requirements in terms of power factor correction, total harmonic distortion, and reliability are getting tighter day by day. As a result, the implementation of reliable and efficient control algorithms, which are able to adjust their control parameters in response to changeable grid operating conditions, is essential. This paper investigates the configuration topology and control algorithm of a single-phase inverter with the purpose of achieving high performance in terms of efficiency as well as total harmonic distortion of the output current. Accordingly, a Second Order Generalized Integrator with a suitable Phase Locked Loop (SOGI-PLL) is the basis of the proposed current and voltage regulation. Some practical issues related to the control algorithm are addressed, and a solution for the control architecture is proposed, based on resonant controllers that are continuously tuned on the basis of the actual grid frequency. Further, intentional islanding operation is investigated and a possible procedure for switching from grid-tied to islanding operation and vice-versa is proposed.

show abstract

“…The method is based on a PLL and the orthogonality between the rotor flux space vector and its back EMF vector. The idea of using PLL comes from control of grid-connected power converters where PLL is used for synchronization with the utility voltages [31][32][33]. Although the proposed method is derived from voltage model flux estimator, rotor flux is estimated without integrating the back EMF vector components in stationary reference frame.…”

Section: Introductionmentioning

confidence: 99%

PLL-based Rotor Flux Estimation Method for Sensorless Vector Controlled Squirrel-Cage Induction Generators

Kutija

Sumina

Čolović³

2016

Automatika

View full text Add to dashboard Cite

Original scientific paperThis paper presents a new rotor flux estimation method for sensorless vector controlled squirrel-cage induction generators used in wind power applications. The proposed method is based on a phase-locked loop (PLL) and the orthogonality between the rotor flux space vector and its back electromotive force (EMF) space vector. Rotor flux is estimated using stator voltage equations without integrating the back EMF components in the stationary reference frame and the well-known difficulties with the implementation of pure integrators are thus avoided. Moreover, the proposed method ensures successful magnetization of a speed-sensorless squirrel-cage induction generator at nonzero speeds which makes it suitable for wind power applications. Experimental results on a 560 kW squirrel-cage induction generator are presented to confirm the effectiveness and the feasibility of the proposed method.Key words: Induction generator, Flux estimation, Phase locked loop (PLL), Sensorless control, Vector control, Wind power generation Metoda za estimaciju magnetskog toka rotora kaveznih asinkronih generatora bez mjernogčlana brzine vrtnje temeljena na fazno spregnutoj petlji. U radu je predstavljena nova metoda za estimaciju magnetskog toka rotora vektorski upravljanih kaveznih asinkronih vjetrogeneratora. Predložena metoda se temelji na fazno spregnutoj petlji i ortogonalnosti izmeu prostornog vektora magnetskog toka rotora i njemu pripadajućeg prostornog vektora induciranog napona. Magnetski tok rotora se estimira korištenjem naponskih jednadžbi statora u koordinatnom sustavu statora bez integracije komponenti induciranog naponačime su izbjegnuti dobro poznati problemi implementacije integratora. Osim toga, predložena metoda omogućava uspješno magnetiziranje pri vrtnji kaveznog asinkronog generatora bez mjernogčlana brzine vrtnje pa je pogodna za primjenu na vjetrogeneratorima. U radu su prikazani eksperimentalni rezultati za kavezni asinkroni generator snage 560 kW koji potvruju izvedivost i učinkovitost predložene metode.Ključne riječi: asinkroni generator, estimacija magnetskog toka, fazno spregnuta petlja, bezsenzorsko upravljanje, vektorsko upravljanje, proizvodnja električne energije iz vjetra

show abstract

Anti-islanding detector based on a robust PLL

Cited by 4 publications

References 19 publications

Optimization of Active Current for Large-Scale Wind Turbines Integrated into Weak Grids for Power System Transient Stability Improvement

Optimization of Active Current for Large-Scale Wind Turbines Integrated into Weak Grids for Power System Transient Stability Improvement

Single-Phase Inverter for Grid-Connected and Intentional Islanding Operations in Electric Utility Systems

PLL-based Rotor Flux Estimation Method for Sensorless Vector Controlled Squirrel-Cage Induction Generators

Contact Info

Product

Resources

About