Integration of large wind farms into utility grids pt. I - Modeling of DFIG

Koessler, R.J.; Pillutla, S.; Trinh, L.H.; Dickmander, D.L.

doi:10.1109/pes.2003.1267380

Cited by 18 publications

(9 citation statements)

References 3 publications

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“…In a set of contributions the computation of the steady-state solution relies on a Brute Force method for the integration of wind farms into the power system [3] and the synchronization of asynchronous wind turbines [4]. In [5] the PSCAD/EMTDC program is used to report the transient behavior of a wind farm connected to the power network under electrical and mechanical disturbances, whilst the SIMULINK program is used to analyze the steady-state and transient operation of a wind farm interconnected at a medium voltage network [6].…”

Section: Nomenclaturementioning

confidence: 99%

Steady-state solution of a wind park using the finite differences and the Newton methods

Perez-Negron

García

2010

IEEE PES General Meeting

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An efficient discrete-time approach for the computation of the steady-state operating point of a wind park is presented in this paper. The Finite Differences method and a Newton approach are applied to determine the steady-state solution of the wind park. Besides, the incorporation of sparse techniques improves the efficiency of the discrete-time solution in terms of storage and computational effort. The wind park is modeled using a time domain frame of reference, suitable for stability studies. While the wind generators are described with a reduced order model for the asynchronous machine, the wind turbine model takes into account the dimension of the turbine and incorporates a pitch angle controller. Each wind generator incorporates a capacitor bank at its terminals for reactive compensation of the induction generator. The dynamic response of a 100 MW wind park is reported using measured wind speed sequence as input to each wind generator. Furthermore, comparisons in terms of convergence and computational effort required to determine the steady-state solution are reported with the Finite Differences method and a Brute Force method. Speed up factors up to 42 are obtained for a 100 MW wind park described with 300 ordinary differential equations.Index Terms-Wind parks, finite differences method, dynamic response, steady-state, sparse techniques, Newton method. I. NOMENCLATUREd, q subscript for direct-and quadrature-axis quantities, respectively δ angle of the rotor flux E induced rotor voltage H constant of inertia i subscript designating wind turbine number n number of wind turbines in the wind farm p c point of connection R a rotor radius r, s subscript for rotor and stator variables, respectively R con resistance between the point of connection and the infinite bus R resistance of the couple circuit ρ air air density P number of pair of poles P wt wind turbine power r s, X s stator resistance and reactance, respectively r r, X r rotor resistance and reactance, respectively T m ,T wt mechanical torque and wind turbine torque V dpc ,V qpc d and q axis voltages at the point of common coupling. V dsi ,V qsi d and q axis stator phase voltages V s infinite bus voltage V wind wind speed X reactance of the couple circuit X con reactance between the point of connection and the infinite bus x m magnetizing reactance x r rotor leakage reactance The authors are with the II. INTRODUCTION IND power has been used for centuries to develop different kind of human activities. The first wind turbine installation for power supply was developed at the beginning of the 20 th century, while the operation of large wind farms as sustainable energy resources became a reality during the last quarter of the 20 th century [1]. As a consequence, new projects are currently being proposed around the world in order to provide a source of power free of CO 2 emissions and green house gases [2].A review of the literature reveals that the analysis of wind parks has been favored with the application of different methods to calculate the steady-stat...

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Section: Nomenclaturementioning

confidence: 99%

Steady-state solution of a wind park using the finite differences and the Newton methods

Perez-Negron

García

2010

IEEE PES General Meeting

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“…A fault is a relatively quick disturbance, compared to the other two. In WTGs, it is typical for the SC to have time constants that are far slower than GC controller time constants [23]. For the particular parameter values chosen in this paper, the SC is so slow that it does not even "notice" the fault; P ord and Q ord remain almost constant throughout the entire simulation.…”

Section: B Parameter Conditioningmentioning

confidence: 99%

Estimating wind turbine parameters and quantifying their effects on dynamic behavior

Rose¹,

Hiskens

2008

2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century

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Abstract-Numerous models have been proposed for representing variable-speed wind turbines in grid stability studies.Often the values for model parameters are poorly known though. The paper initially uses trajectory sensitivities to quantify the effects of individual parameters on the dynamic behavior of wind turbine generators. A parameter estimation process is then used to deduce parameter values from disturbance measurements. Issues of estimation bias arising from non-identifiable parameters are considered. The paper explores the connection between the type of disturbance and the parameters that can be identified from corresponding measurements. This information is valuable in determining the measurements that are required from testing procedures and disturbances in order to build a trustworthy model.

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“…Because of the magnetic coupling between stator and rotor, this current will also flow in the rotor. Moreover, the rotor keeps rotating and the high slip generated introduces overvoltages and overcurrents in the rotor, that can damage the rotor source converters (RSC) and the rotor (see [6,7]). …”

Section: Introductionmentioning

confidence: 99%

Ride through of OWC-based wave power generation plant with air flow control under symmetrical voltage dips

Alberdi

Amundarain

Garrido

et al. 2010

18th Mediterranean Conference on Control and Automation, MED'10

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The suitability of distributed power generation systems working at medium and high capacity as it is the case of wave power generation plants, requires a reliable Fault-RideThrough capability. When a grid fault occurs on the transmission system, the speed of the turbo-generator group increases uncontrolled, the induction generator injects large peak currents that can potentially damage the rotor converters and the plant tends to increase the reactive power consumption, so that it might intensify the voltage dip and contribute to the collapse of the power network. A simple solution would be the automatic disconnection of the plant from the grid in response to the power fault, but this policy could lead to a series of chain disconnections that would produce a massive power network failure. This is why new Grid Codes oblige the distributed power generation systems to remain connected to the power network, even in case of balanced voltage dips. In this paper, an Oscillating Water Column (OWC)-based wave power generation plant equipped with a Doubly Fed Induction Generator is modeled and controlled to overcome these balanced grid faults. The improvement relays on the implementation of a control scheme that suitably coordinates the air flow control, the crowbar, the rotor and the grid side converters to allow the plant to remain in service during the grid fault, and to contribute to its attenuation by supplying reactive power to the network. The simulated results show how it is obtained a great reduction in the rotor currents, improving the transient power stability and avoiding the rotor acceleration, complying with new Grid Codes requirements.

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Integration of large wind farms into utility grids pt. I - Modeling of DFIG

Cited by 18 publications

References 3 publications

Steady-state solution of a wind park using the finite differences and the Newton methods

Steady-state solution of a wind park using the finite differences and the Newton methods

Estimating wind turbine parameters and quantifying their effects on dynamic behavior

Ride through of OWC-based wave power generation plant with air flow control under symmetrical voltage dips

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