scholarly journals Equivalent Modeling of Dfig-Based Wind Farms for Sub-Synchronous Resonance Analysis

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5426
Author(s):  
Gangui Yan ◽  
Dan Wang ◽  
Qi Jia ◽  
Wenbo Hu
Keyword(s):  
Single Machine ◽  
Wind Farm ◽  
Wind Farms ◽  
Equivalent Model ◽  
Detailed Model ◽  
Resonance Analysis ◽  
Clustering Aggregation ◽  
Doubly Fed ◽  
Matrix Similarity ◽  
The Mathematical Model

The order of the detailed model of doubly-fed induction generator (DFIG) wind farms are too high and the simulation is difficult. Most of the existing research has used a single-machine equivalent model and clustering aggregation model for equivalence and few papers have explored the principles and equivalent conditions of the single-machine equivalent model under sub-synchronous resonance (SSR). Due to this reason, this paper equates DFIG wind farms connected with series compensated transmission network to two separate units based on the principle of matrix similarity transformation and the mathematical model and physical model of each unit has been studied. Then, the DFIG wind farm equivalent model’s validity is analyzed in number difference and collecting line difference based on linearization analysis. Finally, the system model is built in EMTDC/PSCAD, the damping analysis method is used to test the equivalent model’s validity and further reveal the mechanism of the system’s unstable operation. The results show that: the equivalent model can effectively reduce the system dimension and accurately reflect the dominant oscillation characteristics of DFIG wind farm under SSR; when SSR occurs, the damping coefficient of DFIG wind farm is negative under the oscillation frequency.

A Coherency-Based Equivalent Model of a Large Scale Wind Farm

2011 ◽  
Vol 347-353 ◽  
pp. 2342-2346
Author(s):  
Rong Fu ◽  
Bao Yun Wang ◽  
Wan Peng Sun
Keyword(s):  
Wind Power ◽  
Wind Turbines ◽  
Large Scale ◽  
Wind Farm ◽  
Dynamic Models ◽  
Wind Farms ◽  
Model Complexity ◽  
Equivalent Model ◽  
Detailed Model ◽  
Doubly Fed

With increasing installation capacity and wind farms penetration, wind power plays more important role in power systems, and the modeling of wind farms has become an interesting research topic. In this paper, a coherency-based equivalent model has been discussed for the doubly fed induction generator (DFIG). Firstly, the dynamic models of wind turbines, DFIG and the mechanisms are briefly introduced. Some existing dynamic equivalent methods such as equivalent wind model, variable speed wind turbine model, parameter identification method and modal equivalent method to be used in wind farm aggregation are discussed. Then, considering wind power fluctuations, a new equivalent model of a wind farm equipped with doubly-fed induction generators is proposed to represent the interactions of the wind farm and grid. The method proposed is based on aggregating the coherent group wind turbines into an equivalent one. Finally, the effectiveness of the equivalent model is demonstrated by comparison with the wind farm response obtained from the detailed model. The dynamic simulations show that the present model can greatly reduce the computation time and model complexity.

Modelling Wind Farm with Doubly Fed Induction Generators Based on Characteristic Fusion

2014 ◽  
Vol 494-495 ◽  
pp. 1820-1824
Author(s):  
Dong Ning Wei ◽  
Xue Min Zhang ◽  
Jian Min Ye
Keyword(s):  
Wind Speed ◽  
Wind Farm ◽  
Measurement Data ◽  
Equivalent Model ◽  
Modelling Framework ◽  
Induction Generators ◽  
Doubly Fed Induction Generators ◽  
Wake Model ◽  
Basic Characteristics ◽  
Doubly Fed

In this paper, a novel modelling approach based on characteristic fusion is proposed and used to build a static equivalent model of wind farm. Firstly, the modelling framework based on characteristic fusion is given. Secondly, the basic characteristics of wind farm including characteristic of wind turbine generator (WTG), wind speed spatial distribution and characteristic of wind farm are analyzed according to the framework. Then detailed modelling process is provided utilizing SVR as a fusion tool. This approach combines the advantages of both mechanism and non-mechanism methods with both satisfactory fitting ability and generalization ability. It only requires the maximum and minimum value of wind speed among the wind farm, rather than accurate wake model as mechanism method nor massive measurement data as non-mechanism method. Numerical simulation indicates the effectiveness and robustness of the proposed method. When available data is reduced or includes bad measurement, the proposed method can still keep favorable performance.

Doubly-Fed Wind Farm Engineering Aggregation Model Used for Planning

2014 ◽  
Vol 986-987 ◽  
pp. 291-294
Author(s):  
Meng Dai
Keyword(s):  
Power Flow ◽  
Wind Farm ◽  
Transient Stability ◽  
Equivalent Model ◽  
Planning Stage ◽  
Aggregation Model ◽  
Technical Requirements ◽  
Farm Model ◽  
Integration Planning ◽  
Doubly Fed

Establishing an appropriate aggregation model of wind farm is the first step of the electrical computation in wind power integration planning. This paper first summarizes the technical requirements of wind farm model from the viewpoint of engineering, then proposes an aggregation DFIG model of wind farm. Because of the lack of measured data in the planning stage, the single equivalent model is used in this paper, and be improved by considering the equivalent collection lines model. The accuracy of the aggregation model in different electrical calculation, such as power flow, transient stability and shortcut current simulation, is verified through a sample system in DIgSILENT.

scholarly journals Equivalent Modeling of a Direct-Drive Wind Farm Based on the Measured Data

2022 ◽  
Vol 2160 (1) ◽  
pp. 012045
Author(s):  
Wenfan Li ◽  
Xuxuan Chen ◽  
Man Li
Keyword(s):  
Wind Speed ◽  
Permanent Magnet ◽  
Wind Farm ◽  
Simulation Analysis ◽  
Permanent Magnet Synchronous Motor ◽  
Current Source ◽  
Equivalent Model ◽  
Direct Drive ◽  
Detailed Model ◽  
The Difference

Abstract In view of the difference between the wind speed and the actual wind speed in the example, the wind farm with fifteen direct-drive permanent magnet synchronous motors draws the recorded wind speed data on the coordinates of time and wind speed by linear regression to group the change trend. Secondly, the detailed model of wind farm is built in PSCAD, and the multi-machine equivalent model of wind farm is built by the control current source replacing the permanent magnet synchronous motor and the control part. Finally, the simulation analysis shows that the equivalent model reduces the simulation time and accurately reflects the dynamic and transient properties of the wind farm.

Study of Reactive Power Compensation for Improvement of Low-Voltage-Ride-Through Capability of Wind Farm

2013 ◽  
Vol 724-725 ◽  
pp. 619-622 ◽  
Author(s):  
Chia Yu Hsu ◽  
Ta Hsiu Tseng ◽  
Pei Hwa Huang
Keyword(s):  
Wind Farm ◽  
Reactive Power ◽  
Low Voltage ◽  
Wind Farms ◽  
Static Synchronous Compensator ◽  
Low Voltage Ride Through ◽  
Induction Generators ◽  
Turbine Generators ◽  
Set Up ◽  
Doubly Fed

The main purpose of this paper is to study the enhancement of the Low-Voltage-Ride-Through (LVRT) capability of the wind farm with the installment of the Static Synchronous Compensator (STATCOM) and the Static Var Compensator (SVC). With more penetration of wind energy from on-shore and off-shore wind farms, utilities have been starting to set up the regulation requiring the wind turbine generators to remain connected to the grid when a fault takes place in the system which is referred to as Low-Voltage-Ride-Through (LVRT). A wind farm composed with doubly fed induction generators is used as the study system. Both the STATCOM and the SVC are utilized as the devices for enhancing the LVRT capability of the wind farm. The results are demonstrated for comparing the performance of the two devices in the improvement of voltage dynamic characteristics of the study system.

Wind Farm Equivalent Modeling Based on Eigen Analysis

2012 ◽  
Vol 433-440 ◽  
pp. 2788-2793 ◽  
Author(s):  
Lin Geng ◽  
Shou Zhen Zhu ◽  
Jing Hong Zheng ◽  
Xiao Yu Wang ◽  
Qun Ju Li ◽  
...  
Keyword(s):  
Power System ◽  
Large Scale ◽  
Wind Farm ◽  
System Simulation ◽  
System Stability ◽  
Equivalent Model ◽  
Power System Simulation ◽  
Detailed Model ◽  
Eigen Analysis ◽  
Farm Model

The increasing size of wind power generation requires considering wind farm model in power system stability analysis. Nowadays, the most widely used wind turbine type is doubly-fed induction generator, which is concerned here. The wind farm detailed model including every individual DFIG is high-dimensional and costs a lot of computation time, thus wind farm equivalent model is required. This paper presents an eigen analysis based approach to settle wind farm equivalent modeling for power system simulation. Simulation results indicate the equivalent model has good accuracy, and can reflect wind farm features, which is proper for large-scale power system simulation.

scholarly journals The Method for Risk Assessment of SSR Caused by Doubly-Fed Wind Farms

2018 ◽  
Vol 173 ◽  
pp. 01028
Author(s):  
Xiao Yu ◽  
Guofei Lu ◽  
Wuhui Chen ◽  
Danhui Wang
Keyword(s):  
Wind Speed ◽  
Wind Farm ◽  
Risk Index ◽  
Wind Farms ◽  
Series Compensation ◽  
Average Wind Speed ◽  
Average Wind ◽  
Doubly Fed ◽  
The Impact ◽  
Compensation Level

The existing method for investigating the subsynchronous resonance (SSR) caused by wind powergeneration is mainly aimed at a deterministic condition. In order to analyse the impact of uncertain factors onSSR in wind farms, this paper defines the risk matrix and risk index, and develops a SSR-oriented riskassessment method of using probabilistic collocation method (PCM). Considering the uncertain of windspeeds, the proposed method is used to assess the SSR risk of a wind farm. The results show that under thesame wind speed distribution, the higher the series compensation level in the system is, the greater the SSRrisk of the system could be; under the same series compensation level, the SSR risks caused by different windspeed distribution are different, and the system in the areas with lower average wind speed obtains greater SSR risk.

scholarly journals Impact of the DFIG-Based Wind Farm Connection on the Fault Component-Based Directional Relay and a Mitigation Countermeasure

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4414
Author(s):  
Xu Li ◽  
Yuping Lu ◽  
Tao Huang
Keyword(s):  
Large Scale ◽  
Wind Farm ◽  
Wind Farms ◽  
High Sensitivity ◽  
Synchronous Generator ◽  
Doubly Fed Induction Generator ◽  
Fault Resistance ◽  
Doubly Fed ◽  
Crowbar Protection ◽  
Directional Relay

With high sensitivity and strong tolerance capability for the fault resistance, the fault component-based directional relay (FCBDR) has drawn considerable attention from industry and academia. However, the best application environment for FCBDR no longer exists when considering the large-scale connection of the doubly fed induction generator (DFIG)-based wind farms. Through a detailed analysis of the superimposed impedance of DFIG, this paper reveals that the performances of FCBDRs may be shown negatively impacted by the fault behaviors of DFIG when the crowbar protection inputs. In addition, this paper proposes a mitigation countermeasure to deal with those issues. The proposed countermeasure takes advantage of the different superimposed impedance features of DFIG compared with that of the synchronous generator (SG) to enhance the adaptability of the conventional FCBDRs. Extensive simulation results show that the proposed countermeasure can differentiate the fault direction clearly under different fault conditions.

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