Modelling analysis of transient stability simulation with high penetration of grid‐connected wind farms of DFIG type

Seo

IEEE Trans. Appl. Supercond.

et al. 2010

This paper analyses operating characteristic of high temperature superconducting magnetic energy storage (HTS SMES) for frequency stabilization of dispersed power generation system. The wind power generation system (WPGS) fluctuates due to wind speed variation and affects the frequency and voltage fluctuations of the utility. SMES is probably a key technology to overcome these fluctuations. To stabilize power system frequency, a large-scale HTS SMES is connected to the terminal of the WPGS. The authors analysed the load side frequencies using two different configurations of SMES, one consisting of a single magnet and the other of a dual magnet. From the simulation results, it can be concluded that the SMES is a useful device for stabilizing the power system frequency fluctuations, and a dual magnet type SMES is more effective for frequency stabilizing but exhibits more AC loss due to the increased operating current than a single magnet type.Index Terms-Dual magnet, superconducting magnetic energy storage (SMES) system, wind power generation system.

Section: Modeling Of the Ulleung Island Power Networkmentioning

confidence: 99%

Operating Characteristic Analysis of HTS SMES for Frequency Stabilization of Dispersed Power Generation System

Seo

IEEE Trans. Appl. Supercond.

et al. 2010

“…Among the variable‐speed wind turbines, the doubly fed induction generator (DFIG) is today the most used wind turbine. It represents an attractive wind turbine concept from an economical point of view since a partial‐scale power converter (25–30% of the generator rated power) connects the rotor winding to grid thus enabling variable‐speed operation and high power control capability.…”

Section: Introductionmentioning

confidence: 99%

Evaluating reduced models of aggregated different doubly fed induction generator wind turbines for transient stabilities studies

García

Fernández

2014

Wind Energy

For the representation of wind farms in transient stability studies of electrical power systems, reduced models based on aggregating identical wind turbines are commonly used. In the case of a wind farm with different wind turbines coupled to the same grid connection point, it is usual to aggregate identical wind turbines operating in similar conditions into an equivalent one. However, in the existing literature, there are not any references to the aggregation of different wind turbines (same wind turbine technology but different rated power or components) into a single one. This paper presents a comparative study of four reduced models for aggregating different DFIG wind turbines, experiencing different incoming winds, into an equivalent model. The first of them is the classical clustering model, in which each equivalent model experiences an equivalent wind. The other reduced models have the same equivalent generation system but different equivalent mechanical systems. Thus, the second and third ones are compound models with a clustering aggregated mechanical system and individual simplified models, respectively, to approximate the individual mechanical power according to the incoming wind speeds. The fourth is a mixed model that uses an equivalent wind speed, which is applied to an equivalent mechanical system (equivalent rotor and drive train) in order to approximate the mechanical power of the aggregated wind turbines. The equivalent models are validated by means of comparison with the complete model of the wind farm when simulated under wind fluctuations and grid disturbances. Finally, recommendations with regard to the applicability of models are established. Copyright © 2014 John Wiley & Sons, Ltd.

“…As a result, wind turbines affect the operating behaviour of the power system in a way that might be different from the dominated synchronous generators. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Particularly, the variable-speed wind turbine like the DFIG is currently the most popular one due to its capability of high energy effi ciency, reactive power control performance and the lower converter rating. Accordingly, in order to study a DFIG-type wind turbine model in the power system, dynamics evaluation with large grid-connected wind farm will be the highlight to be discussed in this paper.…”

Section: Introductionmentioning

confidence: 99%

Analysis of impact of grid‐connected wind power on small signal stability

Shi¹,

Wang²,

Yao³

et al. 2010

Wind Energy

The power system small signal stability analysis considering wind generation intermittence is studied comprehensively in this paper. The modelling of doubly‐fed induction generator (DFIG) involving the converters with application of stator flux‐oriented vector control strategy is addressed briefly. In order to reveal how the intermittent nature of wind power affects the operating behaviour of an existing power system, a probabilistic small signal stability analysis method based on Monte Carlo simulation technique is proposed to explore and exploit the impact of intermittent grid‐connected wind power on small signal stability. The IEEE New England test system is applied as benchmark to verify the proposed model and approach. Total 3 scenarios are elaborately designed to figure out the potential relationship between the small signal stability indices and the wind generation intermittence. Finally, some preliminary conclusions and comments were drawn based on the numerical simulation results. Copyright © 2010 John Wiley & Sons, Ltd.