scholarly journals Impedance Modeling Based Method for Sub/Supsynchronous Oscillation Analysis of D-PMSG Wind Farm

2019 ◽  
Vol 9 (14) ◽  
pp. 2831
Author(s):  
Saijun Yuan ◽  
Zhiguo Hao ◽  
Tao Zhang ◽  
Xiaotian Yuan ◽  
Jin Shu
Keyword(s):  
Wind Farm ◽  
Synchronous Generator ◽  
Critical Issue ◽  
Direct Drive ◽  
Subsynchronous Oscillation ◽  
Impedance Model ◽  
Oscillation Analysis ◽  
Grid Impedance ◽  
Impedance Modeling ◽  
First Time

Subsynchronous oscillation (SSO) is a critical issue for the direct-drive permanent magnet synchronous generator (D-PMSG) based wind farm integrated to a weak onshore AC grid. To analyze the mechanism of the SSO phenomenon of D-PMSG based wind farm, widely used impedance-based stability analysis method is utilized in this paper. First, the impedance model based on the harmonic linearization theory of grid-connected D-PMSG is proposed, and the mechanism of sub/supsynchronous currents coupling is analyzed quantitatively for the first time. Then, based on the impedance model and relative stability criterion, the influence of wind farm operating parameters and grid impedance on stability is discussed. Simulations are carried out to verify the correctness of theoretical analysis.

scholarly journals Power Extraction Control of Variable Speed Wind Turbine Systems Based on Direct Drive Synchronous Generator in All Operating Regimes

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Youssef Errami ◽  
Abdellatif Obbadi ◽  
Smail Sahnoun ◽  
Mohammed Ouassaid ◽  
Mohamed Maaroufi
Keyword(s):  
Power Systems ◽  
Control Strategy ◽  
Wind Farm ◽  
Electrical Power ◽  
Synchronous Generator ◽  
Performance Comparison ◽  
Direct Drive ◽  
Power Extraction ◽  
Wide Range ◽  
Farm System

Due to the increased penetration of wind energy into the electrical power systems in recent years, the turbine controls are actively occupied in the research. This paper presents a nonlinear backstepping strategy to control the generators and the grid sides of a Wind Farm System (WFS) based Direct Drive Synchronous Generator (DDSG). The control objectives such as Tracking the Maximum Power (TMP) from the WFS, pitch control, regulation of dc-link voltage, and reactive and active power generation at varying wind velocity are included. To validate the proposed control strategy, simulation results for 6-MW-DDSG based Wind Farm System are carried out by MATLAB-Simulink. Performance comparison and evaluation with Vector Oriented Control (VOC) are provided under a wide range of functioning conditions, three-phase voltage dips, and the probable occurrence of uncertainties. The proposed control strategy offers remarkable characteristics such as excellent dynamic and steady state performance under varying wind speed and robustness to parametric variations in the WFS and under severe faults of grid voltage.

Input Impedance Modeling of Single-Phase Voltage Source Rectifier With Consideration of FrequencyCoupling Effect

2020 ◽  
Author(s):  
Jianheng Lin ◽  
Mei Su ◽  
Yao Sun ◽  
Shiming Xie
Keyword(s):  
Input Impedance ◽  
Single Phase ◽  
Coupling Effect ◽  
Voltage Source ◽  
Phase Voltage ◽  
Impedance Model ◽  
Grid Impedance ◽  
Impedance Modeling ◽  
Frequency Coupling ◽  
Time Periodicity

Time-periodicity and non-linearity pose a challenge to the precise input impedance modeling of single-phase power converters. In this study, a precise input impedance model with measurability of the single-phase voltage source rectifier (VSR), which considers the frequency-coupling effect (FCE), is established. Meanwhile, it is revealed that the rectifier input impedance is dependent of the grid impedance. In the proposed modeling approach, only Laplace transform and frequencyshifting operation are required, which avoids the complicated convolution calculation in the frequency domain. In addition, the influence of grid impedance on the input impedance is studied. Simulations are conducted to verify the effectiveness of the proposed method. <br>

Direct liquid cooling for an outer‐rotor direct‐drive permanent‐magnet synchronous generator for wind farm applications

2015 ◽  
Vol 9 (8) ◽  
pp. 523-532 ◽  
Author(s):  
Maria Polikarpova ◽  
Pavel Ponomarev ◽  
Pekka Röyttä ◽  
Scott Semken ◽  
Yulia Alexandrova ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Wind Farm ◽  
Synchronous Generator ◽  
Direct Drive ◽  
Liquid Cooling ◽  
Permanent Magnet Synchronous Generator ◽  
Outer Rotor

Design and optimization of permanent magnet synchronous generator dedicated to direct-drive, high power wind turbine

2021 ◽  
pp. 0309524X2110463
Author(s):  
Dorra Abdeljalil ◽  
Mohamed Chaieb ◽  
Naourez Benhadj ◽  
Manel Krichen ◽  
Rafik Neji
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Permanent Magnet ◽  
High Power ◽  
Large Scale ◽  
Wind Farm ◽  
Synchronous Generator ◽  
Direct Drive ◽  
Permanent Magnet Synchronous Generator ◽  
Design And Optimization

This paper presents analysis, design, and optimization of a high-power permanent-magnet synchronous generator (PMSG). This generator is introduced in a large-scale wind turbine which can be used in a big wind farm. This generator is used in gearless configuration. The work focuses on the geometric sizing and the finite element analysis (FEA) of the PMSG. FEA is a good choice for analyzing problems over complicated domains. The flux, the electromotive force, the cogging torque, and the torque are calculated using analytical equations. Then, these parameters are obtained using finite element method (FEM) in the software FEMM and the compared with analytical results in order to validate our study. The second part presents the formulation of the optimization problem, including the optimization space, constraints, and objectives. The genetic algorithm (GA) is adopted in this design optimization in order to minimize the generator cost.

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